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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 /**
     18  * @addtogroup Camera
     19  * @{
     20  */
     21 
     22 /**
     23  * @file NdkCameraMetadataTags.h
     24  */
     25 
     26 /*
     27  * This file defines an NDK API.
     28  * Do not remove methods.
     29  * Do not change method signatures.
     30  * Do not change the value of constants.
     31  * Do not change the size of any of the classes defined in here.
     32  * Do not reference types that are not part of the NDK.
     33  * Do not #include files that aren't part of the NDK.
     34  */
     35 
     36 #ifndef _NDK_CAMERA_METADATA_TAGS_H
     37 #define _NDK_CAMERA_METADATA_TAGS_H
     38 
     39 #include <sys/cdefs.h>
     40 
     41 __BEGIN_DECLS
     42 
     43 #if __ANDROID_API__ >= 24
     44 
     45 typedef enum acamera_metadata_section {
     46     ACAMERA_COLOR_CORRECTION,
     47     ACAMERA_CONTROL,
     48     ACAMERA_DEMOSAIC,
     49     ACAMERA_EDGE,
     50     ACAMERA_FLASH,
     51     ACAMERA_FLASH_INFO,
     52     ACAMERA_HOT_PIXEL,
     53     ACAMERA_JPEG,
     54     ACAMERA_LENS,
     55     ACAMERA_LENS_INFO,
     56     ACAMERA_NOISE_REDUCTION,
     57     ACAMERA_QUIRKS,
     58     ACAMERA_REQUEST,
     59     ACAMERA_SCALER,
     60     ACAMERA_SENSOR,
     61     ACAMERA_SENSOR_INFO,
     62     ACAMERA_SHADING,
     63     ACAMERA_STATISTICS,
     64     ACAMERA_STATISTICS_INFO,
     65     ACAMERA_TONEMAP,
     66     ACAMERA_LED,
     67     ACAMERA_INFO,
     68     ACAMERA_BLACK_LEVEL,
     69     ACAMERA_SYNC,
     70     ACAMERA_REPROCESS,
     71     ACAMERA_DEPTH,
     72     ACAMERA_LOGICAL_MULTI_CAMERA,
     73     ACAMERA_DISTORTION_CORRECTION,
     74     ACAMERA_HEIC,
     75     ACAMERA_HEIC_INFO,
     76     ACAMERA_SECTION_COUNT,
     77 
     78     ACAMERA_VENDOR = 0x8000
     79 } acamera_metadata_section_t;
     80 
     81 /**
     82  * Hierarchy positions in enum space.
     83  */
     84 typedef enum acamera_metadata_section_start {
     85     ACAMERA_COLOR_CORRECTION_START = ACAMERA_COLOR_CORRECTION  << 16,
     86     ACAMERA_CONTROL_START          = ACAMERA_CONTROL           << 16,
     87     ACAMERA_DEMOSAIC_START         = ACAMERA_DEMOSAIC          << 16,
     88     ACAMERA_EDGE_START             = ACAMERA_EDGE              << 16,
     89     ACAMERA_FLASH_START            = ACAMERA_FLASH             << 16,
     90     ACAMERA_FLASH_INFO_START       = ACAMERA_FLASH_INFO        << 16,
     91     ACAMERA_HOT_PIXEL_START        = ACAMERA_HOT_PIXEL         << 16,
     92     ACAMERA_JPEG_START             = ACAMERA_JPEG              << 16,
     93     ACAMERA_LENS_START             = ACAMERA_LENS              << 16,
     94     ACAMERA_LENS_INFO_START        = ACAMERA_LENS_INFO         << 16,
     95     ACAMERA_NOISE_REDUCTION_START  = ACAMERA_NOISE_REDUCTION   << 16,
     96     ACAMERA_QUIRKS_START           = ACAMERA_QUIRKS            << 16,
     97     ACAMERA_REQUEST_START          = ACAMERA_REQUEST           << 16,
     98     ACAMERA_SCALER_START           = ACAMERA_SCALER            << 16,
     99     ACAMERA_SENSOR_START           = ACAMERA_SENSOR            << 16,
    100     ACAMERA_SENSOR_INFO_START      = ACAMERA_SENSOR_INFO       << 16,
    101     ACAMERA_SHADING_START          = ACAMERA_SHADING           << 16,
    102     ACAMERA_STATISTICS_START       = ACAMERA_STATISTICS        << 16,
    103     ACAMERA_STATISTICS_INFO_START  = ACAMERA_STATISTICS_INFO   << 16,
    104     ACAMERA_TONEMAP_START          = ACAMERA_TONEMAP           << 16,
    105     ACAMERA_LED_START              = ACAMERA_LED               << 16,
    106     ACAMERA_INFO_START             = ACAMERA_INFO              << 16,
    107     ACAMERA_BLACK_LEVEL_START      = ACAMERA_BLACK_LEVEL       << 16,
    108     ACAMERA_SYNC_START             = ACAMERA_SYNC              << 16,
    109     ACAMERA_REPROCESS_START        = ACAMERA_REPROCESS         << 16,
    110     ACAMERA_DEPTH_START            = ACAMERA_DEPTH             << 16,
    111     ACAMERA_LOGICAL_MULTI_CAMERA_START
    112                                    = ACAMERA_LOGICAL_MULTI_CAMERA
    113                                                                 << 16,
    114     ACAMERA_DISTORTION_CORRECTION_START
    115                                    = ACAMERA_DISTORTION_CORRECTION
    116                                                                 << 16,
    117     ACAMERA_HEIC_START             = ACAMERA_HEIC              << 16,
    118     ACAMERA_HEIC_INFO_START        = ACAMERA_HEIC_INFO         << 16,
    119     ACAMERA_VENDOR_START           = ACAMERA_VENDOR            << 16
    120 } acamera_metadata_section_start_t;
    121 
    122 /**
    123  * Main enum for camera metadata tags.
    124  */
    125 typedef enum acamera_metadata_tag {
    126     /**
    127      * <p>The mode control selects how the image data is converted from the
    128      * sensor's native color into linear sRGB color.</p>
    129      *
    130      * <p>Type: byte (acamera_metadata_enum_android_color_correction_mode_t)</p>
    131      *
    132      * <p>This tag may appear in:
    133      * <ul>
    134      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    135      *   <li>ACaptureRequest</li>
    136      * </ul></p>
    137      *
    138      * <p>When auto-white balance (AWB) is enabled with ACAMERA_CONTROL_AWB_MODE, this
    139      * control is overridden by the AWB routine. When AWB is disabled, the
    140      * application controls how the color mapping is performed.</p>
    141      * <p>We define the expected processing pipeline below. For consistency
    142      * across devices, this is always the case with TRANSFORM_MATRIX.</p>
    143      * <p>When either FULL or HIGH_QUALITY is used, the camera device may
    144      * do additional processing but ACAMERA_COLOR_CORRECTION_GAINS and
    145      * ACAMERA_COLOR_CORRECTION_TRANSFORM will still be provided by the
    146      * camera device (in the results) and be roughly correct.</p>
    147      * <p>Switching to TRANSFORM_MATRIX and using the data provided from
    148      * FAST or HIGH_QUALITY will yield a picture with the same white point
    149      * as what was produced by the camera device in the earlier frame.</p>
    150      * <p>The expected processing pipeline is as follows:</p>
    151      * <p><img alt="White balance processing pipeline" src="../images/camera2/metadata/android.colorCorrection.mode/processing_pipeline.png" /></p>
    152      * <p>The white balance is encoded by two values, a 4-channel white-balance
    153      * gain vector (applied in the Bayer domain), and a 3x3 color transform
    154      * matrix (applied after demosaic).</p>
    155      * <p>The 4-channel white-balance gains are defined as:</p>
    156      * <pre><code>ACAMERA_COLOR_CORRECTION_GAINS = [ R G_even G_odd B ]
    157      * </code></pre>
    158      * <p>where <code>G_even</code> is the gain for green pixels on even rows of the
    159      * output, and <code>G_odd</code> is the gain for green pixels on the odd rows.
    160      * These may be identical for a given camera device implementation; if
    161      * the camera device does not support a separate gain for even/odd green
    162      * channels, it will use the <code>G_even</code> value, and write <code>G_odd</code> equal to
    163      * <code>G_even</code> in the output result metadata.</p>
    164      * <p>The matrices for color transforms are defined as a 9-entry vector:</p>
    165      * <pre><code>ACAMERA_COLOR_CORRECTION_TRANSFORM = [ I0 I1 I2 I3 I4 I5 I6 I7 I8 ]
    166      * </code></pre>
    167      * <p>which define a transform from input sensor colors, <code>P_in = [ r g b ]</code>,
    168      * to output linear sRGB, <code>P_out = [ r' g' b' ]</code>,</p>
    169      * <p>with colors as follows:</p>
    170      * <pre><code>r' = I0r + I1g + I2b
    171      * g' = I3r + I4g + I5b
    172      * b' = I6r + I7g + I8b
    173      * </code></pre>
    174      * <p>Both the input and output value ranges must match. Overflow/underflow
    175      * values are clipped to fit within the range.</p>
    176      *
    177      * @see ACAMERA_COLOR_CORRECTION_GAINS
    178      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
    179      * @see ACAMERA_CONTROL_AWB_MODE
    180      */
    181     ACAMERA_COLOR_CORRECTION_MODE =                             // byte (acamera_metadata_enum_android_color_correction_mode_t)
    182             ACAMERA_COLOR_CORRECTION_START,
    183     /**
    184      * <p>A color transform matrix to use to transform
    185      * from sensor RGB color space to output linear sRGB color space.</p>
    186      *
    187      * <p>Type: rational[3*3]</p>
    188      *
    189      * <p>This tag may appear in:
    190      * <ul>
    191      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    192      *   <li>ACaptureRequest</li>
    193      * </ul></p>
    194      *
    195      * <p>This matrix is either set by the camera device when the request
    196      * ACAMERA_COLOR_CORRECTION_MODE is not TRANSFORM_MATRIX, or
    197      * directly by the application in the request when the
    198      * ACAMERA_COLOR_CORRECTION_MODE is TRANSFORM_MATRIX.</p>
    199      * <p>In the latter case, the camera device may round the matrix to account
    200      * for precision issues; the final rounded matrix should be reported back
    201      * in this matrix result metadata. The transform should keep the magnitude
    202      * of the output color values within <code>[0, 1.0]</code> (assuming input color
    203      * values is within the normalized range <code>[0, 1.0]</code>), or clipping may occur.</p>
    204      * <p>The valid range of each matrix element varies on different devices, but
    205      * values within [-1.5, 3.0] are guaranteed not to be clipped.</p>
    206      *
    207      * @see ACAMERA_COLOR_CORRECTION_MODE
    208      */
    209     ACAMERA_COLOR_CORRECTION_TRANSFORM =                        // rational[3*3]
    210             ACAMERA_COLOR_CORRECTION_START + 1,
    211     /**
    212      * <p>Gains applying to Bayer raw color channels for
    213      * white-balance.</p>
    214      *
    215      * <p>Type: float[4]</p>
    216      *
    217      * <p>This tag may appear in:
    218      * <ul>
    219      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    220      *   <li>ACaptureRequest</li>
    221      * </ul></p>
    222      *
    223      * <p>These per-channel gains are either set by the camera device
    224      * when the request ACAMERA_COLOR_CORRECTION_MODE is not
    225      * TRANSFORM_MATRIX, or directly by the application in the
    226      * request when the ACAMERA_COLOR_CORRECTION_MODE is
    227      * TRANSFORM_MATRIX.</p>
    228      * <p>The gains in the result metadata are the gains actually
    229      * applied by the camera device to the current frame.</p>
    230      * <p>The valid range of gains varies on different devices, but gains
    231      * between [1.0, 3.0] are guaranteed not to be clipped. Even if a given
    232      * device allows gains below 1.0, this is usually not recommended because
    233      * this can create color artifacts.</p>
    234      *
    235      * @see ACAMERA_COLOR_CORRECTION_MODE
    236      */
    237     ACAMERA_COLOR_CORRECTION_GAINS =                            // float[4]
    238             ACAMERA_COLOR_CORRECTION_START + 2,
    239     /**
    240      * <p>Mode of operation for the chromatic aberration correction algorithm.</p>
    241      *
    242      * <p>Type: byte (acamera_metadata_enum_android_color_correction_aberration_mode_t)</p>
    243      *
    244      * <p>This tag may appear in:
    245      * <ul>
    246      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    247      *   <li>ACaptureRequest</li>
    248      * </ul></p>
    249      *
    250      * <p>Chromatic (color) aberration is caused by the fact that different wavelengths of light
    251      * can not focus on the same point after exiting from the lens. This metadata defines
    252      * the high level control of chromatic aberration correction algorithm, which aims to
    253      * minimize the chromatic artifacts that may occur along the object boundaries in an
    254      * image.</p>
    255      * <p>FAST/HIGH_QUALITY both mean that camera device determined aberration
    256      * correction will be applied. HIGH_QUALITY mode indicates that the camera device will
    257      * use the highest-quality aberration correction algorithms, even if it slows down
    258      * capture rate. FAST means the camera device will not slow down capture rate when
    259      * applying aberration correction.</p>
    260      * <p>LEGACY devices will always be in FAST mode.</p>
    261      */
    262     ACAMERA_COLOR_CORRECTION_ABERRATION_MODE =                  // byte (acamera_metadata_enum_android_color_correction_aberration_mode_t)
    263             ACAMERA_COLOR_CORRECTION_START + 3,
    264     /**
    265      * <p>List of aberration correction modes for ACAMERA_COLOR_CORRECTION_ABERRATION_MODE that are
    266      * supported by this camera device.</p>
    267      *
    268      * @see ACAMERA_COLOR_CORRECTION_ABERRATION_MODE
    269      *
    270      * <p>Type: byte[n]</p>
    271      *
    272      * <p>This tag may appear in:
    273      * <ul>
    274      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
    275      * </ul></p>
    276      *
    277      * <p>This key lists the valid modes for ACAMERA_COLOR_CORRECTION_ABERRATION_MODE.  If no
    278      * aberration correction modes are available for a device, this list will solely include
    279      * OFF mode. All camera devices will support either OFF or FAST mode.</p>
    280      * <p>Camera devices that support the MANUAL_POST_PROCESSING capability will always list
    281      * OFF mode. This includes all FULL level devices.</p>
    282      * <p>LEGACY devices will always only support FAST mode.</p>
    283      *
    284      * @see ACAMERA_COLOR_CORRECTION_ABERRATION_MODE
    285      */
    286     ACAMERA_COLOR_CORRECTION_AVAILABLE_ABERRATION_MODES =       // byte[n]
    287             ACAMERA_COLOR_CORRECTION_START + 4,
    288     ACAMERA_COLOR_CORRECTION_END,
    289 
    290     /**
    291      * <p>The desired setting for the camera device's auto-exposure
    292      * algorithm's antibanding compensation.</p>
    293      *
    294      * <p>Type: byte (acamera_metadata_enum_android_control_ae_antibanding_mode_t)</p>
    295      *
    296      * <p>This tag may appear in:
    297      * <ul>
    298      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    299      *   <li>ACaptureRequest</li>
    300      * </ul></p>
    301      *
    302      * <p>Some kinds of lighting fixtures, such as some fluorescent
    303      * lights, flicker at the rate of the power supply frequency
    304      * (60Hz or 50Hz, depending on country). While this is
    305      * typically not noticeable to a person, it can be visible to
    306      * a camera device. If a camera sets its exposure time to the
    307      * wrong value, the flicker may become visible in the
    308      * viewfinder as flicker or in a final captured image, as a
    309      * set of variable-brightness bands across the image.</p>
    310      * <p>Therefore, the auto-exposure routines of camera devices
    311      * include antibanding routines that ensure that the chosen
    312      * exposure value will not cause such banding. The choice of
    313      * exposure time depends on the rate of flicker, which the
    314      * camera device can detect automatically, or the expected
    315      * rate can be selected by the application using this
    316      * control.</p>
    317      * <p>A given camera device may not support all of the possible
    318      * options for the antibanding mode. The
    319      * ACAMERA_CONTROL_AE_AVAILABLE_ANTIBANDING_MODES key contains
    320      * the available modes for a given camera device.</p>
    321      * <p>AUTO mode is the default if it is available on given
    322      * camera device. When AUTO mode is not available, the
    323      * default will be either 50HZ or 60HZ, and both 50HZ
    324      * and 60HZ will be available.</p>
    325      * <p>If manual exposure control is enabled (by setting
    326      * ACAMERA_CONTROL_AE_MODE or ACAMERA_CONTROL_MODE to OFF),
    327      * then this setting has no effect, and the application must
    328      * ensure it selects exposure times that do not cause banding
    329      * issues. The ACAMERA_STATISTICS_SCENE_FLICKER key can assist
    330      * the application in this.</p>
    331      *
    332      * @see ACAMERA_CONTROL_AE_AVAILABLE_ANTIBANDING_MODES
    333      * @see ACAMERA_CONTROL_AE_MODE
    334      * @see ACAMERA_CONTROL_MODE
    335      * @see ACAMERA_STATISTICS_SCENE_FLICKER
    336      */
    337     ACAMERA_CONTROL_AE_ANTIBANDING_MODE =                       // byte (acamera_metadata_enum_android_control_ae_antibanding_mode_t)
    338             ACAMERA_CONTROL_START,
    339     /**
    340      * <p>Adjustment to auto-exposure (AE) target image
    341      * brightness.</p>
    342      *
    343      * <p>Type: int32</p>
    344      *
    345      * <p>This tag may appear in:
    346      * <ul>
    347      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    348      *   <li>ACaptureRequest</li>
    349      * </ul></p>
    350      *
    351      * <p>The adjustment is measured as a count of steps, with the
    352      * step size defined by ACAMERA_CONTROL_AE_COMPENSATION_STEP and the
    353      * allowed range by ACAMERA_CONTROL_AE_COMPENSATION_RANGE.</p>
    354      * <p>For example, if the exposure value (EV) step is 0.333, '6'
    355      * will mean an exposure compensation of +2 EV; -3 will mean an
    356      * exposure compensation of -1 EV. One EV represents a doubling
    357      * of image brightness. Note that this control will only be
    358      * effective if ACAMERA_CONTROL_AE_MODE <code>!=</code> OFF. This control
    359      * will take effect even when ACAMERA_CONTROL_AE_LOCK <code>== true</code>.</p>
    360      * <p>In the event of exposure compensation value being changed, camera device
    361      * may take several frames to reach the newly requested exposure target.
    362      * During that time, ACAMERA_CONTROL_AE_STATE field will be in the SEARCHING
    363      * state. Once the new exposure target is reached, ACAMERA_CONTROL_AE_STATE will
    364      * change from SEARCHING to either CONVERGED, LOCKED (if AE lock is enabled), or
    365      * FLASH_REQUIRED (if the scene is too dark for still capture).</p>
    366      *
    367      * @see ACAMERA_CONTROL_AE_COMPENSATION_RANGE
    368      * @see ACAMERA_CONTROL_AE_COMPENSATION_STEP
    369      * @see ACAMERA_CONTROL_AE_LOCK
    370      * @see ACAMERA_CONTROL_AE_MODE
    371      * @see ACAMERA_CONTROL_AE_STATE
    372      */
    373     ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION =                  // int32
    374             ACAMERA_CONTROL_START + 1,
    375     /**
    376      * <p>Whether auto-exposure (AE) is currently locked to its latest
    377      * calculated values.</p>
    378      *
    379      * <p>Type: byte (acamera_metadata_enum_android_control_ae_lock_t)</p>
    380      *
    381      * <p>This tag may appear in:
    382      * <ul>
    383      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    384      *   <li>ACaptureRequest</li>
    385      * </ul></p>
    386      *
    387      * <p>When set to <code>true</code> (ON), the AE algorithm is locked to its latest parameters,
    388      * and will not change exposure settings until the lock is set to <code>false</code> (OFF).</p>
    389      * <p>Note that even when AE is locked, the flash may be fired if
    390      * the ACAMERA_CONTROL_AE_MODE is ON_AUTO_FLASH /
    391      * ON_ALWAYS_FLASH / ON_AUTO_FLASH_REDEYE.</p>
    392      * <p>When ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION is changed, even if the AE lock
    393      * is ON, the camera device will still adjust its exposure value.</p>
    394      * <p>If AE precapture is triggered (see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER)
    395      * when AE is already locked, the camera device will not change the exposure time
    396      * (ACAMERA_SENSOR_EXPOSURE_TIME) and sensitivity (ACAMERA_SENSOR_SENSITIVITY)
    397      * parameters. The flash may be fired if the ACAMERA_CONTROL_AE_MODE
    398      * is ON_AUTO_FLASH/ON_AUTO_FLASH_REDEYE and the scene is too dark. If the
    399      * ACAMERA_CONTROL_AE_MODE is ON_ALWAYS_FLASH, the scene may become overexposed.
    400      * Similarly, AE precapture trigger CANCEL has no effect when AE is already locked.</p>
    401      * <p>When an AE precapture sequence is triggered, AE unlock will not be able to unlock
    402      * the AE if AE is locked by the camera device internally during precapture metering
    403      * sequence In other words, submitting requests with AE unlock has no effect for an
    404      * ongoing precapture metering sequence. Otherwise, the precapture metering sequence
    405      * will never succeed in a sequence of preview requests where AE lock is always set
    406      * to <code>false</code>.</p>
    407      * <p>Since the camera device has a pipeline of in-flight requests, the settings that
    408      * get locked do not necessarily correspond to the settings that were present in the
    409      * latest capture result received from the camera device, since additional captures
    410      * and AE updates may have occurred even before the result was sent out. If an
    411      * application is switching between automatic and manual control and wishes to eliminate
    412      * any flicker during the switch, the following procedure is recommended:</p>
    413      * <ol>
    414      * <li>Starting in auto-AE mode:</li>
    415      * <li>Lock AE</li>
    416      * <li>Wait for the first result to be output that has the AE locked</li>
    417      * <li>Copy exposure settings from that result into a request, set the request to manual AE</li>
    418      * <li>Submit the capture request, proceed to run manual AE as desired.</li>
    419      * </ol>
    420      * <p>See ACAMERA_CONTROL_AE_STATE for AE lock related state transition details.</p>
    421      *
    422      * @see ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION
    423      * @see ACAMERA_CONTROL_AE_MODE
    424      * @see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
    425      * @see ACAMERA_CONTROL_AE_STATE
    426      * @see ACAMERA_SENSOR_EXPOSURE_TIME
    427      * @see ACAMERA_SENSOR_SENSITIVITY
    428      */
    429     ACAMERA_CONTROL_AE_LOCK =                                   // byte (acamera_metadata_enum_android_control_ae_lock_t)
    430             ACAMERA_CONTROL_START + 2,
    431     /**
    432      * <p>The desired mode for the camera device's
    433      * auto-exposure routine.</p>
    434      *
    435      * <p>Type: byte (acamera_metadata_enum_android_control_ae_mode_t)</p>
    436      *
    437      * <p>This tag may appear in:
    438      * <ul>
    439      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    440      *   <li>ACaptureRequest</li>
    441      * </ul></p>
    442      *
    443      * <p>This control is only effective if ACAMERA_CONTROL_MODE is
    444      * AUTO.</p>
    445      * <p>When set to any of the ON modes, the camera device's
    446      * auto-exposure routine is enabled, overriding the
    447      * application's selected exposure time, sensor sensitivity,
    448      * and frame duration (ACAMERA_SENSOR_EXPOSURE_TIME,
    449      * ACAMERA_SENSOR_SENSITIVITY, and
    450      * ACAMERA_SENSOR_FRAME_DURATION). If one of the FLASH modes
    451      * is selected, the camera device's flash unit controls are
    452      * also overridden.</p>
    453      * <p>The FLASH modes are only available if the camera device
    454      * has a flash unit (ACAMERA_FLASH_INFO_AVAILABLE is <code>true</code>).</p>
    455      * <p>If flash TORCH mode is desired, this field must be set to
    456      * ON or OFF, and ACAMERA_FLASH_MODE set to TORCH.</p>
    457      * <p>When set to any of the ON modes, the values chosen by the
    458      * camera device auto-exposure routine for the overridden
    459      * fields for a given capture will be available in its
    460      * CaptureResult.</p>
    461      *
    462      * @see ACAMERA_CONTROL_MODE
    463      * @see ACAMERA_FLASH_INFO_AVAILABLE
    464      * @see ACAMERA_FLASH_MODE
    465      * @see ACAMERA_SENSOR_EXPOSURE_TIME
    466      * @see ACAMERA_SENSOR_FRAME_DURATION
    467      * @see ACAMERA_SENSOR_SENSITIVITY
    468      */
    469     ACAMERA_CONTROL_AE_MODE =                                   // byte (acamera_metadata_enum_android_control_ae_mode_t)
    470             ACAMERA_CONTROL_START + 3,
    471     /**
    472      * <p>List of metering areas to use for auto-exposure adjustment.</p>
    473      *
    474      * <p>Type: int32[5*area_count]</p>
    475      *
    476      * <p>This tag may appear in:
    477      * <ul>
    478      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    479      *   <li>ACaptureRequest</li>
    480      * </ul></p>
    481      *
    482      * <p>Not available if android.control.maxRegionsAe is 0.
    483      * Otherwise will always be present.</p>
    484      * <p>The maximum number of regions supported by the device is determined by the value
    485      * of android.control.maxRegionsAe.</p>
    486      * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
    487      * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with (0,0) being
    488      * the top-left pixel in the active pixel array, and
    489      * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
    490      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
    491      * active pixel array.</p>
    492      * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
    493      * system depends on the mode being set.
    494      * When the distortion correction mode is OFF, the coordinate system follows
    495      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
    496      * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array, and
    497      * (ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.width - 1,
    498      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right
    499      * pixel in the pre-correction active pixel array.
    500      * When the distortion correction mode is not OFF, the coordinate system follows
    501      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
    502      * <code>(0, 0)</code> being the top-left pixel of the active array, and
    503      * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
    504      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
    505      * active pixel array.</p>
    506      * <p>The weight must be within <code>[0, 1000]</code>, and represents a weight
    507      * for every pixel in the area. This means that a large metering area
    508      * with the same weight as a smaller area will have more effect in
    509      * the metering result. Metering areas can partially overlap and the
    510      * camera device will add the weights in the overlap region.</p>
    511      * <p>The weights are relative to weights of other exposure metering regions, so if only one
    512      * region is used, all non-zero weights will have the same effect. A region with 0
    513      * weight is ignored.</p>
    514      * <p>If all regions have 0 weight, then no specific metering area needs to be used by the
    515      * camera device.</p>
    516      * <p>If the metering region is outside the used ACAMERA_SCALER_CROP_REGION returned in
    517      * capture result metadata, the camera device will ignore the sections outside the crop
    518      * region and output only the intersection rectangle as the metering region in the result
    519      * metadata.  If the region is entirely outside the crop region, it will be ignored and
    520      * not reported in the result metadata.</p>
    521      * <p>The data representation is <code>int[5 * area_count]</code>.
    522      * Every five elements represent a metering region of <code>(xmin, ymin, xmax, ymax, weight)</code>.
    523      * The rectangle is defined to be inclusive on xmin and ymin, but exclusive on xmax and
    524      * ymax.</p>
    525      *
    526      * @see ACAMERA_DISTORTION_CORRECTION_MODE
    527      * @see ACAMERA_SCALER_CROP_REGION
    528      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
    529      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
    530      */
    531     ACAMERA_CONTROL_AE_REGIONS =                                // int32[5*area_count]
    532             ACAMERA_CONTROL_START + 4,
    533     /**
    534      * <p>Range over which the auto-exposure routine can
    535      * adjust the capture frame rate to maintain good
    536      * exposure.</p>
    537      *
    538      * <p>Type: int32[2]</p>
    539      *
    540      * <p>This tag may appear in:
    541      * <ul>
    542      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    543      *   <li>ACaptureRequest</li>
    544      * </ul></p>
    545      *
    546      * <p>Only constrains auto-exposure (AE) algorithm, not
    547      * manual control of ACAMERA_SENSOR_EXPOSURE_TIME and
    548      * ACAMERA_SENSOR_FRAME_DURATION.</p>
    549      *
    550      * @see ACAMERA_SENSOR_EXPOSURE_TIME
    551      * @see ACAMERA_SENSOR_FRAME_DURATION
    552      */
    553     ACAMERA_CONTROL_AE_TARGET_FPS_RANGE =                       // int32[2]
    554             ACAMERA_CONTROL_START + 5,
    555     /**
    556      * <p>Whether the camera device will trigger a precapture
    557      * metering sequence when it processes this request.</p>
    558      *
    559      * <p>Type: byte (acamera_metadata_enum_android_control_ae_precapture_trigger_t)</p>
    560      *
    561      * <p>This tag may appear in:
    562      * <ul>
    563      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    564      *   <li>ACaptureRequest</li>
    565      * </ul></p>
    566      *
    567      * <p>This entry is normally set to IDLE, or is not
    568      * included at all in the request settings. When included and
    569      * set to START, the camera device will trigger the auto-exposure (AE)
    570      * precapture metering sequence.</p>
    571      * <p>When set to CANCEL, the camera device will cancel any active
    572      * precapture metering trigger, and return to its initial AE state.
    573      * If a precapture metering sequence is already completed, and the camera
    574      * device has implicitly locked the AE for subsequent still capture, the
    575      * CANCEL trigger will unlock the AE and return to its initial AE state.</p>
    576      * <p>The precapture sequence should be triggered before starting a
    577      * high-quality still capture for final metering decisions to
    578      * be made, and for firing pre-capture flash pulses to estimate
    579      * scene brightness and required final capture flash power, when
    580      * the flash is enabled.</p>
    581      * <p>Normally, this entry should be set to START for only a
    582      * single request, and the application should wait until the
    583      * sequence completes before starting a new one.</p>
    584      * <p>When a precapture metering sequence is finished, the camera device
    585      * may lock the auto-exposure routine internally to be able to accurately expose the
    586      * subsequent still capture image (<code>ACAMERA_CONTROL_CAPTURE_INTENT == STILL_CAPTURE</code>).
    587      * For this case, the AE may not resume normal scan if no subsequent still capture is
    588      * submitted. To ensure that the AE routine restarts normal scan, the application should
    589      * submit a request with <code>ACAMERA_CONTROL_AE_LOCK == true</code>, followed by a request
    590      * with <code>ACAMERA_CONTROL_AE_LOCK == false</code>, if the application decides not to submit a
    591      * still capture request after the precapture sequence completes. Alternatively, for
    592      * API level 23 or newer devices, the CANCEL can be used to unlock the camera device
    593      * internally locked AE if the application doesn't submit a still capture request after
    594      * the AE precapture trigger. Note that, the CANCEL was added in API level 23, and must not
    595      * be used in devices that have earlier API levels.</p>
    596      * <p>The exact effect of auto-exposure (AE) precapture trigger
    597      * depends on the current AE mode and state; see
    598      * ACAMERA_CONTROL_AE_STATE for AE precapture state transition
    599      * details.</p>
    600      * <p>On LEGACY-level devices, the precapture trigger is not supported;
    601      * capturing a high-resolution JPEG image will automatically trigger a
    602      * precapture sequence before the high-resolution capture, including
    603      * potentially firing a pre-capture flash.</p>
    604      * <p>Using the precapture trigger and the auto-focus trigger ACAMERA_CONTROL_AF_TRIGGER
    605      * simultaneously is allowed. However, since these triggers often require cooperation between
    606      * the auto-focus and auto-exposure routines (for example, the may need to be enabled for a
    607      * focus sweep), the camera device may delay acting on a later trigger until the previous
    608      * trigger has been fully handled. This may lead to longer intervals between the trigger and
    609      * changes to ACAMERA_CONTROL_AE_STATE indicating the start of the precapture sequence, for
    610      * example.</p>
    611      * <p>If both the precapture and the auto-focus trigger are activated on the same request, then
    612      * the camera device will complete them in the optimal order for that device.</p>
    613      *
    614      * @see ACAMERA_CONTROL_AE_LOCK
    615      * @see ACAMERA_CONTROL_AE_STATE
    616      * @see ACAMERA_CONTROL_AF_TRIGGER
    617      * @see ACAMERA_CONTROL_CAPTURE_INTENT
    618      */
    619     ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER =                     // byte (acamera_metadata_enum_android_control_ae_precapture_trigger_t)
    620             ACAMERA_CONTROL_START + 6,
    621     /**
    622      * <p>Whether auto-focus (AF) is currently enabled, and what
    623      * mode it is set to.</p>
    624      *
    625      * <p>Type: byte (acamera_metadata_enum_android_control_af_mode_t)</p>
    626      *
    627      * <p>This tag may appear in:
    628      * <ul>
    629      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    630      *   <li>ACaptureRequest</li>
    631      * </ul></p>
    632      *
    633      * <p>Only effective if ACAMERA_CONTROL_MODE = AUTO and the lens is not fixed focus
    634      * (i.e. <code>ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE &gt; 0</code>). Also note that
    635      * when ACAMERA_CONTROL_AE_MODE is OFF, the behavior of AF is device
    636      * dependent. It is recommended to lock AF by using ACAMERA_CONTROL_AF_TRIGGER before
    637      * setting ACAMERA_CONTROL_AE_MODE to OFF, or set AF mode to OFF when AE is OFF.</p>
    638      * <p>If the lens is controlled by the camera device auto-focus algorithm,
    639      * the camera device will report the current AF status in ACAMERA_CONTROL_AF_STATE
    640      * in result metadata.</p>
    641      *
    642      * @see ACAMERA_CONTROL_AE_MODE
    643      * @see ACAMERA_CONTROL_AF_STATE
    644      * @see ACAMERA_CONTROL_AF_TRIGGER
    645      * @see ACAMERA_CONTROL_MODE
    646      * @see ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE
    647      */
    648     ACAMERA_CONTROL_AF_MODE =                                   // byte (acamera_metadata_enum_android_control_af_mode_t)
    649             ACAMERA_CONTROL_START + 7,
    650     /**
    651      * <p>List of metering areas to use for auto-focus.</p>
    652      *
    653      * <p>Type: int32[5*area_count]</p>
    654      *
    655      * <p>This tag may appear in:
    656      * <ul>
    657      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    658      *   <li>ACaptureRequest</li>
    659      * </ul></p>
    660      *
    661      * <p>Not available if android.control.maxRegionsAf is 0.
    662      * Otherwise will always be present.</p>
    663      * <p>The maximum number of focus areas supported by the device is determined by the value
    664      * of android.control.maxRegionsAf.</p>
    665      * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
    666      * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with (0,0) being
    667      * the top-left pixel in the active pixel array, and
    668      * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
    669      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
    670      * active pixel array.</p>
    671      * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
    672      * system depends on the mode being set.
    673      * When the distortion correction mode is OFF, the coordinate system follows
    674      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
    675      * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array, and
    676      * (ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.width - 1,
    677      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right
    678      * pixel in the pre-correction active pixel array.
    679      * When the distortion correction mode is not OFF, the coordinate system follows
    680      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
    681      * <code>(0, 0)</code> being the top-left pixel of the active array, and
    682      * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
    683      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
    684      * active pixel array.</p>
    685      * <p>The weight must be within <code>[0, 1000]</code>, and represents a weight
    686      * for every pixel in the area. This means that a large metering area
    687      * with the same weight as a smaller area will have more effect in
    688      * the metering result. Metering areas can partially overlap and the
    689      * camera device will add the weights in the overlap region.</p>
    690      * <p>The weights are relative to weights of other metering regions, so if only one region
    691      * is used, all non-zero weights will have the same effect. A region with 0 weight is
    692      * ignored.</p>
    693      * <p>If all regions have 0 weight, then no specific metering area needs to be used by the
    694      * camera device. The capture result will either be a zero weight region as well, or
    695      * the region selected by the camera device as the focus area of interest.</p>
    696      * <p>If the metering region is outside the used ACAMERA_SCALER_CROP_REGION returned in
    697      * capture result metadata, the camera device will ignore the sections outside the crop
    698      * region and output only the intersection rectangle as the metering region in the result
    699      * metadata. If the region is entirely outside the crop region, it will be ignored and
    700      * not reported in the result metadata.</p>
    701      * <p>The data representation is <code>int[5 * area_count]</code>.
    702      * Every five elements represent a metering region of <code>(xmin, ymin, xmax, ymax, weight)</code>.
    703      * The rectangle is defined to be inclusive on xmin and ymin, but exclusive on xmax and
    704      * ymax.</p>
    705      *
    706      * @see ACAMERA_DISTORTION_CORRECTION_MODE
    707      * @see ACAMERA_SCALER_CROP_REGION
    708      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
    709      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
    710      */
    711     ACAMERA_CONTROL_AF_REGIONS =                                // int32[5*area_count]
    712             ACAMERA_CONTROL_START + 8,
    713     /**
    714      * <p>Whether the camera device will trigger autofocus for this request.</p>
    715      *
    716      * <p>Type: byte (acamera_metadata_enum_android_control_af_trigger_t)</p>
    717      *
    718      * <p>This tag may appear in:
    719      * <ul>
    720      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    721      *   <li>ACaptureRequest</li>
    722      * </ul></p>
    723      *
    724      * <p>This entry is normally set to IDLE, or is not
    725      * included at all in the request settings.</p>
    726      * <p>When included and set to START, the camera device will trigger the
    727      * autofocus algorithm. If autofocus is disabled, this trigger has no effect.</p>
    728      * <p>When set to CANCEL, the camera device will cancel any active trigger,
    729      * and return to its initial AF state.</p>
    730      * <p>Generally, applications should set this entry to START or CANCEL for only a
    731      * single capture, and then return it to IDLE (or not set at all). Specifying
    732      * START for multiple captures in a row means restarting the AF operation over
    733      * and over again.</p>
    734      * <p>See ACAMERA_CONTROL_AF_STATE for what the trigger means for each AF mode.</p>
    735      * <p>Using the autofocus trigger and the precapture trigger ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
    736      * simultaneously is allowed. However, since these triggers often require cooperation between
    737      * the auto-focus and auto-exposure routines (for example, the may need to be enabled for a
    738      * focus sweep), the camera device may delay acting on a later trigger until the previous
    739      * trigger has been fully handled. This may lead to longer intervals between the trigger and
    740      * changes to ACAMERA_CONTROL_AF_STATE, for example.</p>
    741      *
    742      * @see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
    743      * @see ACAMERA_CONTROL_AF_STATE
    744      */
    745     ACAMERA_CONTROL_AF_TRIGGER =                                // byte (acamera_metadata_enum_android_control_af_trigger_t)
    746             ACAMERA_CONTROL_START + 9,
    747     /**
    748      * <p>Whether auto-white balance (AWB) is currently locked to its
    749      * latest calculated values.</p>
    750      *
    751      * <p>Type: byte (acamera_metadata_enum_android_control_awb_lock_t)</p>
    752      *
    753      * <p>This tag may appear in:
    754      * <ul>
    755      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    756      *   <li>ACaptureRequest</li>
    757      * </ul></p>
    758      *
    759      * <p>When set to <code>true</code> (ON), the AWB algorithm is locked to its latest parameters,
    760      * and will not change color balance settings until the lock is set to <code>false</code> (OFF).</p>
    761      * <p>Since the camera device has a pipeline of in-flight requests, the settings that
    762      * get locked do not necessarily correspond to the settings that were present in the
    763      * latest capture result received from the camera device, since additional captures
    764      * and AWB updates may have occurred even before the result was sent out. If an
    765      * application is switching between automatic and manual control and wishes to eliminate
    766      * any flicker during the switch, the following procedure is recommended:</p>
    767      * <ol>
    768      * <li>Starting in auto-AWB mode:</li>
    769      * <li>Lock AWB</li>
    770      * <li>Wait for the first result to be output that has the AWB locked</li>
    771      * <li>Copy AWB settings from that result into a request, set the request to manual AWB</li>
    772      * <li>Submit the capture request, proceed to run manual AWB as desired.</li>
    773      * </ol>
    774      * <p>Note that AWB lock is only meaningful when
    775      * ACAMERA_CONTROL_AWB_MODE is in the AUTO mode; in other modes,
    776      * AWB is already fixed to a specific setting.</p>
    777      * <p>Some LEGACY devices may not support ON; the value is then overridden to OFF.</p>
    778      *
    779      * @see ACAMERA_CONTROL_AWB_MODE
    780      */
    781     ACAMERA_CONTROL_AWB_LOCK =                                  // byte (acamera_metadata_enum_android_control_awb_lock_t)
    782             ACAMERA_CONTROL_START + 10,
    783     /**
    784      * <p>Whether auto-white balance (AWB) is currently setting the color
    785      * transform fields, and what its illumination target
    786      * is.</p>
    787      *
    788      * <p>Type: byte (acamera_metadata_enum_android_control_awb_mode_t)</p>
    789      *
    790      * <p>This tag may appear in:
    791      * <ul>
    792      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    793      *   <li>ACaptureRequest</li>
    794      * </ul></p>
    795      *
    796      * <p>This control is only effective if ACAMERA_CONTROL_MODE is AUTO.</p>
    797      * <p>When set to the ON mode, the camera device's auto-white balance
    798      * routine is enabled, overriding the application's selected
    799      * ACAMERA_COLOR_CORRECTION_TRANSFORM, ACAMERA_COLOR_CORRECTION_GAINS and
    800      * ACAMERA_COLOR_CORRECTION_MODE. Note that when ACAMERA_CONTROL_AE_MODE
    801      * is OFF, the behavior of AWB is device dependent. It is recommened to
    802      * also set AWB mode to OFF or lock AWB by using ACAMERA_CONTROL_AWB_LOCK before
    803      * setting AE mode to OFF.</p>
    804      * <p>When set to the OFF mode, the camera device's auto-white balance
    805      * routine is disabled. The application manually controls the white
    806      * balance by ACAMERA_COLOR_CORRECTION_TRANSFORM, ACAMERA_COLOR_CORRECTION_GAINS
    807      * and ACAMERA_COLOR_CORRECTION_MODE.</p>
    808      * <p>When set to any other modes, the camera device's auto-white
    809      * balance routine is disabled. The camera device uses each
    810      * particular illumination target for white balance
    811      * adjustment. The application's values for
    812      * ACAMERA_COLOR_CORRECTION_TRANSFORM,
    813      * ACAMERA_COLOR_CORRECTION_GAINS and
    814      * ACAMERA_COLOR_CORRECTION_MODE are ignored.</p>
    815      *
    816      * @see ACAMERA_COLOR_CORRECTION_GAINS
    817      * @see ACAMERA_COLOR_CORRECTION_MODE
    818      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
    819      * @see ACAMERA_CONTROL_AE_MODE
    820      * @see ACAMERA_CONTROL_AWB_LOCK
    821      * @see ACAMERA_CONTROL_MODE
    822      */
    823     ACAMERA_CONTROL_AWB_MODE =                                  // byte (acamera_metadata_enum_android_control_awb_mode_t)
    824             ACAMERA_CONTROL_START + 11,
    825     /**
    826      * <p>List of metering areas to use for auto-white-balance illuminant
    827      * estimation.</p>
    828      *
    829      * <p>Type: int32[5*area_count]</p>
    830      *
    831      * <p>This tag may appear in:
    832      * <ul>
    833      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    834      *   <li>ACaptureRequest</li>
    835      * </ul></p>
    836      *
    837      * <p>Not available if android.control.maxRegionsAwb is 0.
    838      * Otherwise will always be present.</p>
    839      * <p>The maximum number of regions supported by the device is determined by the value
    840      * of android.control.maxRegionsAwb.</p>
    841      * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
    842      * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with (0,0) being
    843      * the top-left pixel in the active pixel array, and
    844      * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
    845      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
    846      * active pixel array.</p>
    847      * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
    848      * system depends on the mode being set.
    849      * When the distortion correction mode is OFF, the coordinate system follows
    850      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
    851      * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array, and
    852      * (ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.width - 1,
    853      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right
    854      * pixel in the pre-correction active pixel array.
    855      * When the distortion correction mode is not OFF, the coordinate system follows
    856      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
    857      * <code>(0, 0)</code> being the top-left pixel of the active array, and
    858      * (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.width - 1,
    859      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.height - 1) being the bottom-right pixel in the
    860      * active pixel array.</p>
    861      * <p>The weight must range from 0 to 1000, and represents a weight
    862      * for every pixel in the area. This means that a large metering area
    863      * with the same weight as a smaller area will have more effect in
    864      * the metering result. Metering areas can partially overlap and the
    865      * camera device will add the weights in the overlap region.</p>
    866      * <p>The weights are relative to weights of other white balance metering regions, so if
    867      * only one region is used, all non-zero weights will have the same effect. A region with
    868      * 0 weight is ignored.</p>
    869      * <p>If all regions have 0 weight, then no specific metering area needs to be used by the
    870      * camera device.</p>
    871      * <p>If the metering region is outside the used ACAMERA_SCALER_CROP_REGION returned in
    872      * capture result metadata, the camera device will ignore the sections outside the crop
    873      * region and output only the intersection rectangle as the metering region in the result
    874      * metadata.  If the region is entirely outside the crop region, it will be ignored and
    875      * not reported in the result metadata.</p>
    876      * <p>The data representation is <code>int[5 * area_count]</code>.
    877      * Every five elements represent a metering region of <code>(xmin, ymin, xmax, ymax, weight)</code>.
    878      * The rectangle is defined to be inclusive on xmin and ymin, but exclusive on xmax and
    879      * ymax.</p>
    880      *
    881      * @see ACAMERA_DISTORTION_CORRECTION_MODE
    882      * @see ACAMERA_SCALER_CROP_REGION
    883      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
    884      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
    885      */
    886     ACAMERA_CONTROL_AWB_REGIONS =                               // int32[5*area_count]
    887             ACAMERA_CONTROL_START + 12,
    888     /**
    889      * <p>Information to the camera device 3A (auto-exposure,
    890      * auto-focus, auto-white balance) routines about the purpose
    891      * of this capture, to help the camera device to decide optimal 3A
    892      * strategy.</p>
    893      *
    894      * <p>Type: byte (acamera_metadata_enum_android_control_capture_intent_t)</p>
    895      *
    896      * <p>This tag may appear in:
    897      * <ul>
    898      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    899      *   <li>ACaptureRequest</li>
    900      * </ul></p>
    901      *
    902      * <p>This control (except for MANUAL) is only effective if
    903      * <code>ACAMERA_CONTROL_MODE != OFF</code> and any 3A routine is active.</p>
    904      * <p>All intents are supported by all devices, except that:
    905      *   * ZERO_SHUTTER_LAG will be supported if ACAMERA_REQUEST_AVAILABLE_CAPABILITIES contains
    906      * PRIVATE_REPROCESSING or YUV_REPROCESSING.
    907      *   * MANUAL will be supported if ACAMERA_REQUEST_AVAILABLE_CAPABILITIES contains
    908      * MANUAL_SENSOR.
    909      *   * MOTION_TRACKING will be supported if ACAMERA_REQUEST_AVAILABLE_CAPABILITIES contains
    910      * MOTION_TRACKING.</p>
    911      *
    912      * @see ACAMERA_CONTROL_MODE
    913      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
    914      */
    915     ACAMERA_CONTROL_CAPTURE_INTENT =                            // byte (acamera_metadata_enum_android_control_capture_intent_t)
    916             ACAMERA_CONTROL_START + 13,
    917     /**
    918      * <p>A special color effect to apply.</p>
    919      *
    920      * <p>Type: byte (acamera_metadata_enum_android_control_effect_mode_t)</p>
    921      *
    922      * <p>This tag may appear in:
    923      * <ul>
    924      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    925      *   <li>ACaptureRequest</li>
    926      * </ul></p>
    927      *
    928      * <p>When this mode is set, a color effect will be applied
    929      * to images produced by the camera device. The interpretation
    930      * and implementation of these color effects is left to the
    931      * implementor of the camera device, and should not be
    932      * depended on to be consistent (or present) across all
    933      * devices.</p>
    934      */
    935     ACAMERA_CONTROL_EFFECT_MODE =                               // byte (acamera_metadata_enum_android_control_effect_mode_t)
    936             ACAMERA_CONTROL_START + 14,
    937     /**
    938      * <p>Overall mode of 3A (auto-exposure, auto-white-balance, auto-focus) control
    939      * routines.</p>
    940      *
    941      * <p>Type: byte (acamera_metadata_enum_android_control_mode_t)</p>
    942      *
    943      * <p>This tag may appear in:
    944      * <ul>
    945      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    946      *   <li>ACaptureRequest</li>
    947      * </ul></p>
    948      *
    949      * <p>This is a top-level 3A control switch. When set to OFF, all 3A control
    950      * by the camera device is disabled. The application must set the fields for
    951      * capture parameters itself.</p>
    952      * <p>When set to AUTO, the individual algorithm controls in
    953      * ACAMERA_CONTROL_* are in effect, such as ACAMERA_CONTROL_AF_MODE.</p>
    954      * <p>When set to USE_SCENE_MODE, the individual controls in
    955      * ACAMERA_CONTROL_* are mostly disabled, and the camera device
    956      * implements one of the scene mode settings (such as ACTION,
    957      * SUNSET, or PARTY) as it wishes. The camera device scene mode
    958      * 3A settings are provided by {@link ACameraCaptureSession_captureCallback_result capture results}.</p>
    959      * <p>When set to OFF_KEEP_STATE, it is similar to OFF mode, the only difference
    960      * is that this frame will not be used by camera device background 3A statistics
    961      * update, as if this frame is never captured. This mode can be used in the scenario
    962      * where the application doesn't want a 3A manual control capture to affect
    963      * the subsequent auto 3A capture results.</p>
    964      *
    965      * @see ACAMERA_CONTROL_AF_MODE
    966      */
    967     ACAMERA_CONTROL_MODE =                                      // byte (acamera_metadata_enum_android_control_mode_t)
    968             ACAMERA_CONTROL_START + 15,
    969     /**
    970      * <p>Control for which scene mode is currently active.</p>
    971      *
    972      * <p>Type: byte (acamera_metadata_enum_android_control_scene_mode_t)</p>
    973      *
    974      * <p>This tag may appear in:
    975      * <ul>
    976      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
    977      *   <li>ACaptureRequest</li>
    978      * </ul></p>
    979      *
    980      * <p>Scene modes are custom camera modes optimized for a certain set of conditions and
    981      * capture settings.</p>
    982      * <p>This is the mode that that is active when
    983      * <code>ACAMERA_CONTROL_MODE == USE_SCENE_MODE</code>. Aside from FACE_PRIORITY, these modes will
    984      * disable ACAMERA_CONTROL_AE_MODE, ACAMERA_CONTROL_AWB_MODE, and ACAMERA_CONTROL_AF_MODE
    985      * while in use.</p>
    986      * <p>The interpretation and implementation of these scene modes is left
    987      * to the implementor of the camera device. Their behavior will not be
    988      * consistent across all devices, and any given device may only implement
    989      * a subset of these modes.</p>
    990      *
    991      * @see ACAMERA_CONTROL_AE_MODE
    992      * @see ACAMERA_CONTROL_AF_MODE
    993      * @see ACAMERA_CONTROL_AWB_MODE
    994      * @see ACAMERA_CONTROL_MODE
    995      */
    996     ACAMERA_CONTROL_SCENE_MODE =                                // byte (acamera_metadata_enum_android_control_scene_mode_t)
    997             ACAMERA_CONTROL_START + 16,
    998     /**
    999      * <p>Whether video stabilization is
   1000      * active.</p>
   1001      *
   1002      * <p>Type: byte (acamera_metadata_enum_android_control_video_stabilization_mode_t)</p>
   1003      *
   1004      * <p>This tag may appear in:
   1005      * <ul>
   1006      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1007      *   <li>ACaptureRequest</li>
   1008      * </ul></p>
   1009      *
   1010      * <p>Video stabilization automatically warps images from
   1011      * the camera in order to stabilize motion between consecutive frames.</p>
   1012      * <p>If enabled, video stabilization can modify the
   1013      * ACAMERA_SCALER_CROP_REGION to keep the video stream stabilized.</p>
   1014      * <p>Switching between different video stabilization modes may take several
   1015      * frames to initialize, the camera device will report the current mode
   1016      * in capture result metadata. For example, When "ON" mode is requested,
   1017      * the video stabilization modes in the first several capture results may
   1018      * still be "OFF", and it will become "ON" when the initialization is
   1019      * done.</p>
   1020      * <p>In addition, not all recording sizes or frame rates may be supported for
   1021      * stabilization by a device that reports stabilization support. It is guaranteed
   1022      * that an output targeting a MediaRecorder or MediaCodec will be stabilized if
   1023      * the recording resolution is less than or equal to 1920 x 1080 (width less than
   1024      * or equal to 1920, height less than or equal to 1080), and the recording
   1025      * frame rate is less than or equal to 30fps.  At other sizes, the CaptureResult
   1026      * ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE field will return
   1027      * OFF if the recording output is not stabilized, or if there are no output
   1028      * Surface types that can be stabilized.</p>
   1029      * <p>If a camera device supports both this mode and OIS
   1030      * (ACAMERA_LENS_OPTICAL_STABILIZATION_MODE), turning both modes on may
   1031      * produce undesirable interaction, so it is recommended not to enable
   1032      * both at the same time.</p>
   1033      *
   1034      * @see ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE
   1035      * @see ACAMERA_LENS_OPTICAL_STABILIZATION_MODE
   1036      * @see ACAMERA_SCALER_CROP_REGION
   1037      */
   1038     ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE =                  // byte (acamera_metadata_enum_android_control_video_stabilization_mode_t)
   1039             ACAMERA_CONTROL_START + 17,
   1040     /**
   1041      * <p>List of auto-exposure antibanding modes for ACAMERA_CONTROL_AE_ANTIBANDING_MODE that are
   1042      * supported by this camera device.</p>
   1043      *
   1044      * @see ACAMERA_CONTROL_AE_ANTIBANDING_MODE
   1045      *
   1046      * <p>Type: byte[n]</p>
   1047      *
   1048      * <p>This tag may appear in:
   1049      * <ul>
   1050      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1051      * </ul></p>
   1052      *
   1053      * <p>Not all of the auto-exposure anti-banding modes may be
   1054      * supported by a given camera device. This field lists the
   1055      * valid anti-banding modes that the application may request
   1056      * for this camera device with the
   1057      * ACAMERA_CONTROL_AE_ANTIBANDING_MODE control.</p>
   1058      *
   1059      * @see ACAMERA_CONTROL_AE_ANTIBANDING_MODE
   1060      */
   1061     ACAMERA_CONTROL_AE_AVAILABLE_ANTIBANDING_MODES =            // byte[n]
   1062             ACAMERA_CONTROL_START + 18,
   1063     /**
   1064      * <p>List of auto-exposure modes for ACAMERA_CONTROL_AE_MODE that are supported by this camera
   1065      * device.</p>
   1066      *
   1067      * @see ACAMERA_CONTROL_AE_MODE
   1068      *
   1069      * <p>Type: byte[n]</p>
   1070      *
   1071      * <p>This tag may appear in:
   1072      * <ul>
   1073      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1074      * </ul></p>
   1075      *
   1076      * <p>Not all the auto-exposure modes may be supported by a
   1077      * given camera device, especially if no flash unit is
   1078      * available. This entry lists the valid modes for
   1079      * ACAMERA_CONTROL_AE_MODE for this camera device.</p>
   1080      * <p>All camera devices support ON, and all camera devices with flash
   1081      * units support ON_AUTO_FLASH and ON_ALWAYS_FLASH.</p>
   1082      * <p>FULL mode camera devices always support OFF mode,
   1083      * which enables application control of camera exposure time,
   1084      * sensitivity, and frame duration.</p>
   1085      * <p>LEGACY mode camera devices never support OFF mode.
   1086      * LIMITED mode devices support OFF if they support the MANUAL_SENSOR
   1087      * capability.</p>
   1088      *
   1089      * @see ACAMERA_CONTROL_AE_MODE
   1090      */
   1091     ACAMERA_CONTROL_AE_AVAILABLE_MODES =                        // byte[n]
   1092             ACAMERA_CONTROL_START + 19,
   1093     /**
   1094      * <p>List of frame rate ranges for ACAMERA_CONTROL_AE_TARGET_FPS_RANGE supported by
   1095      * this camera device.</p>
   1096      *
   1097      * @see ACAMERA_CONTROL_AE_TARGET_FPS_RANGE
   1098      *
   1099      * <p>Type: int32[2*n]</p>
   1100      *
   1101      * <p>This tag may appear in:
   1102      * <ul>
   1103      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1104      * </ul></p>
   1105      *
   1106      * <p>For devices at the LEGACY level or above:</p>
   1107      * <ul>
   1108      * <li>
   1109      * <p>For constant-framerate recording, for each normal
   1110      * <a href="https://developer.android.com/reference/android/media/CamcorderProfile.html">CamcorderProfile</a>, that is, a
   1111      * <a href="https://developer.android.com/reference/android/media/CamcorderProfile.html">CamcorderProfile</a> that has
   1112      * <a href="https://developer.android.com/reference/android/media/CamcorderProfile.html#quality">quality</a> in
   1113      * the range [<a href="https://developer.android.com/reference/android/media/CamcorderProfile.html#QUALITY_LOW">QUALITY_LOW</a>,
   1114      * <a href="https://developer.android.com/reference/android/media/CamcorderProfile.html#QUALITY_2160P">QUALITY_2160P</a>], if the profile is
   1115      * supported by the device and has
   1116      * <a href="https://developer.android.com/reference/android/media/CamcorderProfile.html#videoFrameRate">videoFrameRate</a> <code>x</code>, this list will
   1117      * always include (<code>x</code>,<code>x</code>).</p>
   1118      * </li>
   1119      * <li>
   1120      * <p>Also, a camera device must either not support any
   1121      * <a href="https://developer.android.com/reference/android/media/CamcorderProfile.html">CamcorderProfile</a>,
   1122      * or support at least one
   1123      * normal <a href="https://developer.android.com/reference/android/media/CamcorderProfile.html">CamcorderProfile</a> that has
   1124      * <a href="https://developer.android.com/reference/android/media/CamcorderProfile.html#videoFrameRate">videoFrameRate</a> <code>x</code> &gt;= 24.</p>
   1125      * </li>
   1126      * </ul>
   1127      * <p>For devices at the LIMITED level or above:</p>
   1128      * <ul>
   1129      * <li>For YUV_420_888 burst capture use case, this list will always include (<code>min</code>, <code>max</code>)
   1130      * and (<code>max</code>, <code>max</code>) where <code>min</code> &lt;= 15 and <code>max</code> = the maximum output frame rate of the
   1131      * maximum YUV_420_888 output size.</li>
   1132      * </ul>
   1133      */
   1134     ACAMERA_CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES =            // int32[2*n]
   1135             ACAMERA_CONTROL_START + 20,
   1136     /**
   1137      * <p>Maximum and minimum exposure compensation values for
   1138      * ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION, in counts of ACAMERA_CONTROL_AE_COMPENSATION_STEP,
   1139      * that are supported by this camera device.</p>
   1140      *
   1141      * @see ACAMERA_CONTROL_AE_COMPENSATION_STEP
   1142      * @see ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION
   1143      *
   1144      * <p>Type: int32[2]</p>
   1145      *
   1146      * <p>This tag may appear in:
   1147      * <ul>
   1148      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1149      * </ul></p>
   1150      *
   1151      */
   1152     ACAMERA_CONTROL_AE_COMPENSATION_RANGE =                     // int32[2]
   1153             ACAMERA_CONTROL_START + 21,
   1154     /**
   1155      * <p>Smallest step by which the exposure compensation
   1156      * can be changed.</p>
   1157      *
   1158      * <p>Type: rational</p>
   1159      *
   1160      * <p>This tag may appear in:
   1161      * <ul>
   1162      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1163      * </ul></p>
   1164      *
   1165      * <p>This is the unit for ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION. For example, if this key has
   1166      * a value of <code>1/2</code>, then a setting of <code>-2</code> for ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION means
   1167      * that the target EV offset for the auto-exposure routine is -1 EV.</p>
   1168      * <p>One unit of EV compensation changes the brightness of the captured image by a factor
   1169      * of two. +1 EV doubles the image brightness, while -1 EV halves the image brightness.</p>
   1170      *
   1171      * @see ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION
   1172      */
   1173     ACAMERA_CONTROL_AE_COMPENSATION_STEP =                      // rational
   1174             ACAMERA_CONTROL_START + 22,
   1175     /**
   1176      * <p>List of auto-focus (AF) modes for ACAMERA_CONTROL_AF_MODE that are
   1177      * supported by this camera device.</p>
   1178      *
   1179      * @see ACAMERA_CONTROL_AF_MODE
   1180      *
   1181      * <p>Type: byte[n]</p>
   1182      *
   1183      * <p>This tag may appear in:
   1184      * <ul>
   1185      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1186      * </ul></p>
   1187      *
   1188      * <p>Not all the auto-focus modes may be supported by a
   1189      * given camera device. This entry lists the valid modes for
   1190      * ACAMERA_CONTROL_AF_MODE for this camera device.</p>
   1191      * <p>All LIMITED and FULL mode camera devices will support OFF mode, and all
   1192      * camera devices with adjustable focuser units
   1193      * (<code>ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE &gt; 0</code>) will support AUTO mode.</p>
   1194      * <p>LEGACY devices will support OFF mode only if they support
   1195      * focusing to infinity (by also setting ACAMERA_LENS_FOCUS_DISTANCE to
   1196      * <code>0.0f</code>).</p>
   1197      *
   1198      * @see ACAMERA_CONTROL_AF_MODE
   1199      * @see ACAMERA_LENS_FOCUS_DISTANCE
   1200      * @see ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE
   1201      */
   1202     ACAMERA_CONTROL_AF_AVAILABLE_MODES =                        // byte[n]
   1203             ACAMERA_CONTROL_START + 23,
   1204     /**
   1205      * <p>List of color effects for ACAMERA_CONTROL_EFFECT_MODE that are supported by this camera
   1206      * device.</p>
   1207      *
   1208      * @see ACAMERA_CONTROL_EFFECT_MODE
   1209      *
   1210      * <p>Type: byte[n]</p>
   1211      *
   1212      * <p>This tag may appear in:
   1213      * <ul>
   1214      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1215      * </ul></p>
   1216      *
   1217      * <p>This list contains the color effect modes that can be applied to
   1218      * images produced by the camera device.
   1219      * Implementations are not expected to be consistent across all devices.
   1220      * If no color effect modes are available for a device, this will only list
   1221      * OFF.</p>
   1222      * <p>A color effect will only be applied if
   1223      * ACAMERA_CONTROL_MODE != OFF.  OFF is always included in this list.</p>
   1224      * <p>This control has no effect on the operation of other control routines such
   1225      * as auto-exposure, white balance, or focus.</p>
   1226      *
   1227      * @see ACAMERA_CONTROL_MODE
   1228      */
   1229     ACAMERA_CONTROL_AVAILABLE_EFFECTS =                         // byte[n]
   1230             ACAMERA_CONTROL_START + 24,
   1231     /**
   1232      * <p>List of scene modes for ACAMERA_CONTROL_SCENE_MODE that are supported by this camera
   1233      * device.</p>
   1234      *
   1235      * @see ACAMERA_CONTROL_SCENE_MODE
   1236      *
   1237      * <p>Type: byte[n]</p>
   1238      *
   1239      * <p>This tag may appear in:
   1240      * <ul>
   1241      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1242      * </ul></p>
   1243      *
   1244      * <p>This list contains scene modes that can be set for the camera device.
   1245      * Only scene modes that have been fully implemented for the
   1246      * camera device may be included here. Implementations are not expected
   1247      * to be consistent across all devices.</p>
   1248      * <p>If no scene modes are supported by the camera device, this
   1249      * will be set to DISABLED. Otherwise DISABLED will not be listed.</p>
   1250      * <p>FACE_PRIORITY is always listed if face detection is
   1251      * supported (i.e.<code>ACAMERA_STATISTICS_INFO_MAX_FACE_COUNT &gt;
   1252      * 0</code>).</p>
   1253      *
   1254      * @see ACAMERA_STATISTICS_INFO_MAX_FACE_COUNT
   1255      */
   1256     ACAMERA_CONTROL_AVAILABLE_SCENE_MODES =                     // byte[n]
   1257             ACAMERA_CONTROL_START + 25,
   1258     /**
   1259      * <p>List of video stabilization modes for ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE
   1260      * that are supported by this camera device.</p>
   1261      *
   1262      * @see ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE
   1263      *
   1264      * <p>Type: byte[n]</p>
   1265      *
   1266      * <p>This tag may appear in:
   1267      * <ul>
   1268      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1269      * </ul></p>
   1270      *
   1271      * <p>OFF will always be listed.</p>
   1272      */
   1273     ACAMERA_CONTROL_AVAILABLE_VIDEO_STABILIZATION_MODES =       // byte[n]
   1274             ACAMERA_CONTROL_START + 26,
   1275     /**
   1276      * <p>List of auto-white-balance modes for ACAMERA_CONTROL_AWB_MODE that are supported by this
   1277      * camera device.</p>
   1278      *
   1279      * @see ACAMERA_CONTROL_AWB_MODE
   1280      *
   1281      * <p>Type: byte[n]</p>
   1282      *
   1283      * <p>This tag may appear in:
   1284      * <ul>
   1285      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1286      * </ul></p>
   1287      *
   1288      * <p>Not all the auto-white-balance modes may be supported by a
   1289      * given camera device. This entry lists the valid modes for
   1290      * ACAMERA_CONTROL_AWB_MODE for this camera device.</p>
   1291      * <p>All camera devices will support ON mode.</p>
   1292      * <p>Camera devices that support the MANUAL_POST_PROCESSING capability will always support OFF
   1293      * mode, which enables application control of white balance, by using
   1294      * ACAMERA_COLOR_CORRECTION_TRANSFORM and ACAMERA_COLOR_CORRECTION_GAINS(ACAMERA_COLOR_CORRECTION_MODE must be set to TRANSFORM_MATRIX). This includes all FULL
   1295      * mode camera devices.</p>
   1296      *
   1297      * @see ACAMERA_COLOR_CORRECTION_GAINS
   1298      * @see ACAMERA_COLOR_CORRECTION_MODE
   1299      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   1300      * @see ACAMERA_CONTROL_AWB_MODE
   1301      */
   1302     ACAMERA_CONTROL_AWB_AVAILABLE_MODES =                       // byte[n]
   1303             ACAMERA_CONTROL_START + 27,
   1304     /**
   1305      * <p>List of the maximum number of regions that can be used for metering in
   1306      * auto-exposure (AE), auto-white balance (AWB), and auto-focus (AF);
   1307      * this corresponds to the the maximum number of elements in
   1308      * ACAMERA_CONTROL_AE_REGIONS, ACAMERA_CONTROL_AWB_REGIONS,
   1309      * and ACAMERA_CONTROL_AF_REGIONS.</p>
   1310      *
   1311      * @see ACAMERA_CONTROL_AE_REGIONS
   1312      * @see ACAMERA_CONTROL_AF_REGIONS
   1313      * @see ACAMERA_CONTROL_AWB_REGIONS
   1314      *
   1315      * <p>Type: int32[3]</p>
   1316      *
   1317      * <p>This tag may appear in:
   1318      * <ul>
   1319      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1320      * </ul></p>
   1321      *
   1322      */
   1323     ACAMERA_CONTROL_MAX_REGIONS =                               // int32[3]
   1324             ACAMERA_CONTROL_START + 28,
   1325     /**
   1326      * <p>Current state of the auto-exposure (AE) algorithm.</p>
   1327      *
   1328      * <p>Type: byte (acamera_metadata_enum_android_control_ae_state_t)</p>
   1329      *
   1330      * <p>This tag may appear in:
   1331      * <ul>
   1332      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1333      * </ul></p>
   1334      *
   1335      * <p>Switching between or enabling AE modes (ACAMERA_CONTROL_AE_MODE) always
   1336      * resets the AE state to INACTIVE. Similarly, switching between ACAMERA_CONTROL_MODE,
   1337      * or ACAMERA_CONTROL_SCENE_MODE if <code>ACAMERA_CONTROL_MODE == USE_SCENE_MODE</code> resets all
   1338      * the algorithm states to INACTIVE.</p>
   1339      * <p>The camera device can do several state transitions between two results, if it is
   1340      * allowed by the state transition table. For example: INACTIVE may never actually be
   1341      * seen in a result.</p>
   1342      * <p>The state in the result is the state for this image (in sync with this image): if
   1343      * AE state becomes CONVERGED, then the image data associated with this result should
   1344      * be good to use.</p>
   1345      * <p>Below are state transition tables for different AE modes.</p>
   1346      * <p>State       | Transition Cause | New State | Notes
   1347      * :------------:|:----------------:|:---------:|:-----------------------:
   1348      * INACTIVE      |                  | INACTIVE  | Camera device auto exposure algorithm is disabled</p>
   1349      * <p>When ACAMERA_CONTROL_AE_MODE is AE_MODE_ON*:</p>
   1350      * <p>State        | Transition Cause                             | New State      | Notes
   1351      * :-------------:|:--------------------------------------------:|:--------------:|:-----------------:
   1352      * INACTIVE       | Camera device initiates AE scan              | SEARCHING      | Values changing
   1353      * INACTIVE       | ACAMERA_CONTROL_AE_LOCK is ON                 | LOCKED         | Values locked
   1354      * SEARCHING      | Camera device finishes AE scan               | CONVERGED      | Good values, not changing
   1355      * SEARCHING      | Camera device finishes AE scan               | FLASH_REQUIRED | Converged but too dark w/o flash
   1356      * SEARCHING      | ACAMERA_CONTROL_AE_LOCK is ON                 | LOCKED         | Values locked
   1357      * CONVERGED      | Camera device initiates AE scan              | SEARCHING      | Values changing
   1358      * CONVERGED      | ACAMERA_CONTROL_AE_LOCK is ON                 | LOCKED         | Values locked
   1359      * FLASH_REQUIRED | Camera device initiates AE scan              | SEARCHING      | Values changing
   1360      * FLASH_REQUIRED | ACAMERA_CONTROL_AE_LOCK is ON                 | LOCKED         | Values locked
   1361      * LOCKED         | ACAMERA_CONTROL_AE_LOCK is OFF                | SEARCHING      | Values not good after unlock
   1362      * LOCKED         | ACAMERA_CONTROL_AE_LOCK is OFF                | CONVERGED      | Values good after unlock
   1363      * LOCKED         | ACAMERA_CONTROL_AE_LOCK is OFF                | FLASH_REQUIRED | Exposure good, but too dark
   1364      * PRECAPTURE     | Sequence done. ACAMERA_CONTROL_AE_LOCK is OFF | CONVERGED      | Ready for high-quality capture
   1365      * PRECAPTURE     | Sequence done. ACAMERA_CONTROL_AE_LOCK is ON  | LOCKED         | Ready for high-quality capture
   1366      * LOCKED         | aeLock is ON and aePrecaptureTrigger is START | LOCKED        | Precapture trigger is ignored when AE is already locked
   1367      * LOCKED         | aeLock is ON and aePrecaptureTrigger is CANCEL| LOCKED        | Precapture trigger is ignored when AE is already locked
   1368      * Any state (excluding LOCKED) | ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER is START | PRECAPTURE     | Start AE precapture metering sequence
   1369      * Any state (excluding LOCKED) | ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER is CANCEL| INACTIVE       | Currently active precapture metering sequence is canceled</p>
   1370      * <p>If the camera device supports AE external flash mode (ON_EXTERNAL_FLASH is included in
   1371      * ACAMERA_CONTROL_AE_AVAILABLE_MODES), ACAMERA_CONTROL_AE_STATE must be FLASH_REQUIRED after
   1372      * the camera device finishes AE scan and it's too dark without flash.</p>
   1373      * <p>For the above table, the camera device may skip reporting any state changes that happen
   1374      * without application intervention (i.e. mode switch, trigger, locking). Any state that
   1375      * can be skipped in that manner is called a transient state.</p>
   1376      * <p>For example, for above AE modes (AE_MODE_ON*), in addition to the state transitions
   1377      * listed in above table, it is also legal for the camera device to skip one or more
   1378      * transient states between two results. See below table for examples:</p>
   1379      * <p>State        | Transition Cause                                            | New State      | Notes
   1380      * :-------------:|:-----------------------------------------------------------:|:--------------:|:-----------------:
   1381      * INACTIVE       | Camera device finished AE scan                              | CONVERGED      | Values are already good, transient states are skipped by camera device.
   1382      * Any state (excluding LOCKED) | ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER is START, sequence done | FLASH_REQUIRED | Converged but too dark w/o flash after a precapture sequence, transient states are skipped by camera device.
   1383      * Any state (excluding LOCKED) | ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER is START, sequence done | CONVERGED      | Converged after a precapture sequence, transient states are skipped by camera device.
   1384      * Any state (excluding LOCKED) | ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER is CANCEL, converged    | FLASH_REQUIRED | Converged but too dark w/o flash after a precapture sequence is canceled, transient states are skipped by camera device.
   1385      * Any state (excluding LOCKED) | ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER is CANCEL, converged    | CONVERGED      | Converged after a precapture sequenceis canceled, transient states are skipped by camera device.
   1386      * CONVERGED      | Camera device finished AE scan                              | FLASH_REQUIRED | Converged but too dark w/o flash after a new scan, transient states are skipped by camera device.
   1387      * FLASH_REQUIRED | Camera device finished AE scan                              | CONVERGED      | Converged after a new scan, transient states are skipped by camera device.</p>
   1388      *
   1389      * @see ACAMERA_CONTROL_AE_AVAILABLE_MODES
   1390      * @see ACAMERA_CONTROL_AE_LOCK
   1391      * @see ACAMERA_CONTROL_AE_MODE
   1392      * @see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
   1393      * @see ACAMERA_CONTROL_AE_STATE
   1394      * @see ACAMERA_CONTROL_MODE
   1395      * @see ACAMERA_CONTROL_SCENE_MODE
   1396      */
   1397     ACAMERA_CONTROL_AE_STATE =                                  // byte (acamera_metadata_enum_android_control_ae_state_t)
   1398             ACAMERA_CONTROL_START + 31,
   1399     /**
   1400      * <p>Current state of auto-focus (AF) algorithm.</p>
   1401      *
   1402      * <p>Type: byte (acamera_metadata_enum_android_control_af_state_t)</p>
   1403      *
   1404      * <p>This tag may appear in:
   1405      * <ul>
   1406      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1407      * </ul></p>
   1408      *
   1409      * <p>Switching between or enabling AF modes (ACAMERA_CONTROL_AF_MODE) always
   1410      * resets the AF state to INACTIVE. Similarly, switching between ACAMERA_CONTROL_MODE,
   1411      * or ACAMERA_CONTROL_SCENE_MODE if <code>ACAMERA_CONTROL_MODE == USE_SCENE_MODE</code> resets all
   1412      * the algorithm states to INACTIVE.</p>
   1413      * <p>The camera device can do several state transitions between two results, if it is
   1414      * allowed by the state transition table. For example: INACTIVE may never actually be
   1415      * seen in a result.</p>
   1416      * <p>The state in the result is the state for this image (in sync with this image): if
   1417      * AF state becomes FOCUSED, then the image data associated with this result should
   1418      * be sharp.</p>
   1419      * <p>Below are state transition tables for different AF modes.</p>
   1420      * <p>When ACAMERA_CONTROL_AF_MODE is AF_MODE_OFF or AF_MODE_EDOF:</p>
   1421      * <p>State       | Transition Cause | New State | Notes
   1422      * :------------:|:----------------:|:---------:|:-----------:
   1423      * INACTIVE      |                  | INACTIVE  | Never changes</p>
   1424      * <p>When ACAMERA_CONTROL_AF_MODE is AF_MODE_AUTO or AF_MODE_MACRO:</p>
   1425      * <p>State            | Transition Cause | New State          | Notes
   1426      * :-----------------:|:----------------:|:------------------:|:--------------:
   1427      * INACTIVE           | AF_TRIGGER       | ACTIVE_SCAN        | Start AF sweep, Lens now moving
   1428      * ACTIVE_SCAN        | AF sweep done    | FOCUSED_LOCKED     | Focused, Lens now locked
   1429      * ACTIVE_SCAN        | AF sweep done    | NOT_FOCUSED_LOCKED | Not focused, Lens now locked
   1430      * ACTIVE_SCAN        | AF_CANCEL        | INACTIVE           | Cancel/reset AF, Lens now locked
   1431      * FOCUSED_LOCKED     | AF_CANCEL        | INACTIVE           | Cancel/reset AF
   1432      * FOCUSED_LOCKED     | AF_TRIGGER       | ACTIVE_SCAN        | Start new sweep, Lens now moving
   1433      * NOT_FOCUSED_LOCKED | AF_CANCEL        | INACTIVE           | Cancel/reset AF
   1434      * NOT_FOCUSED_LOCKED | AF_TRIGGER       | ACTIVE_SCAN        | Start new sweep, Lens now moving
   1435      * Any state          | Mode change      | INACTIVE           |</p>
   1436      * <p>For the above table, the camera device may skip reporting any state changes that happen
   1437      * without application intervention (i.e. mode switch, trigger, locking). Any state that
   1438      * can be skipped in that manner is called a transient state.</p>
   1439      * <p>For example, for these AF modes (AF_MODE_AUTO and AF_MODE_MACRO), in addition to the
   1440      * state transitions listed in above table, it is also legal for the camera device to skip
   1441      * one or more transient states between two results. See below table for examples:</p>
   1442      * <p>State            | Transition Cause | New State          | Notes
   1443      * :-----------------:|:----------------:|:------------------:|:--------------:
   1444      * INACTIVE           | AF_TRIGGER       | FOCUSED_LOCKED     | Focus is already good or good after a scan, lens is now locked.
   1445      * INACTIVE           | AF_TRIGGER       | NOT_FOCUSED_LOCKED | Focus failed after a scan, lens is now locked.
   1446      * FOCUSED_LOCKED     | AF_TRIGGER       | FOCUSED_LOCKED     | Focus is already good or good after a scan, lens is now locked.
   1447      * NOT_FOCUSED_LOCKED | AF_TRIGGER       | FOCUSED_LOCKED     | Focus is good after a scan, lens is not locked.</p>
   1448      * <p>When ACAMERA_CONTROL_AF_MODE is AF_MODE_CONTINUOUS_VIDEO:</p>
   1449      * <p>State            | Transition Cause                    | New State          | Notes
   1450      * :-----------------:|:-----------------------------------:|:------------------:|:--------------:
   1451      * INACTIVE           | Camera device initiates new scan    | PASSIVE_SCAN       | Start AF scan, Lens now moving
   1452      * INACTIVE           | AF_TRIGGER                          | NOT_FOCUSED_LOCKED | AF state query, Lens now locked
   1453      * PASSIVE_SCAN       | Camera device completes current scan| PASSIVE_FOCUSED    | End AF scan, Lens now locked
   1454      * PASSIVE_SCAN       | Camera device fails current scan    | PASSIVE_UNFOCUSED  | End AF scan, Lens now locked
   1455      * PASSIVE_SCAN       | AF_TRIGGER                          | FOCUSED_LOCKED     | Immediate transition, if focus is good. Lens now locked
   1456      * PASSIVE_SCAN       | AF_TRIGGER                          | NOT_FOCUSED_LOCKED | Immediate transition, if focus is bad. Lens now locked
   1457      * PASSIVE_SCAN       | AF_CANCEL                           | INACTIVE           | Reset lens position, Lens now locked
   1458      * PASSIVE_FOCUSED    | Camera device initiates new scan    | PASSIVE_SCAN       | Start AF scan, Lens now moving
   1459      * PASSIVE_UNFOCUSED  | Camera device initiates new scan    | PASSIVE_SCAN       | Start AF scan, Lens now moving
   1460      * PASSIVE_FOCUSED    | AF_TRIGGER                          | FOCUSED_LOCKED     | Immediate transition, lens now locked
   1461      * PASSIVE_UNFOCUSED  | AF_TRIGGER                          | NOT_FOCUSED_LOCKED | Immediate transition, lens now locked
   1462      * FOCUSED_LOCKED     | AF_TRIGGER                          | FOCUSED_LOCKED     | No effect
   1463      * FOCUSED_LOCKED     | AF_CANCEL                           | INACTIVE           | Restart AF scan
   1464      * NOT_FOCUSED_LOCKED | AF_TRIGGER                          | NOT_FOCUSED_LOCKED | No effect
   1465      * NOT_FOCUSED_LOCKED | AF_CANCEL                           | INACTIVE           | Restart AF scan</p>
   1466      * <p>When ACAMERA_CONTROL_AF_MODE is AF_MODE_CONTINUOUS_PICTURE:</p>
   1467      * <p>State            | Transition Cause                     | New State          | Notes
   1468      * :-----------------:|:------------------------------------:|:------------------:|:--------------:
   1469      * INACTIVE           | Camera device initiates new scan     | PASSIVE_SCAN       | Start AF scan, Lens now moving
   1470      * INACTIVE           | AF_TRIGGER                           | NOT_FOCUSED_LOCKED | AF state query, Lens now locked
   1471      * PASSIVE_SCAN       | Camera device completes current scan | PASSIVE_FOCUSED    | End AF scan, Lens now locked
   1472      * PASSIVE_SCAN       | Camera device fails current scan     | PASSIVE_UNFOCUSED  | End AF scan, Lens now locked
   1473      * PASSIVE_SCAN       | AF_TRIGGER                           | FOCUSED_LOCKED     | Eventual transition once the focus is good. Lens now locked
   1474      * PASSIVE_SCAN       | AF_TRIGGER                           | NOT_FOCUSED_LOCKED | Eventual transition if cannot find focus. Lens now locked
   1475      * PASSIVE_SCAN       | AF_CANCEL                            | INACTIVE           | Reset lens position, Lens now locked
   1476      * PASSIVE_FOCUSED    | Camera device initiates new scan     | PASSIVE_SCAN       | Start AF scan, Lens now moving
   1477      * PASSIVE_UNFOCUSED  | Camera device initiates new scan     | PASSIVE_SCAN       | Start AF scan, Lens now moving
   1478      * PASSIVE_FOCUSED    | AF_TRIGGER                           | FOCUSED_LOCKED     | Immediate trans. Lens now locked
   1479      * PASSIVE_UNFOCUSED  | AF_TRIGGER                           | NOT_FOCUSED_LOCKED | Immediate trans. Lens now locked
   1480      * FOCUSED_LOCKED     | AF_TRIGGER                           | FOCUSED_LOCKED     | No effect
   1481      * FOCUSED_LOCKED     | AF_CANCEL                            | INACTIVE           | Restart AF scan
   1482      * NOT_FOCUSED_LOCKED | AF_TRIGGER                           | NOT_FOCUSED_LOCKED | No effect
   1483      * NOT_FOCUSED_LOCKED | AF_CANCEL                            | INACTIVE           | Restart AF scan</p>
   1484      * <p>When switch between AF_MODE_CONTINUOUS_* (CAF modes) and AF_MODE_AUTO/AF_MODE_MACRO
   1485      * (AUTO modes), the initial INACTIVE or PASSIVE_SCAN states may be skipped by the
   1486      * camera device. When a trigger is included in a mode switch request, the trigger
   1487      * will be evaluated in the context of the new mode in the request.
   1488      * See below table for examples:</p>
   1489      * <p>State      | Transition Cause                       | New State                                | Notes
   1490      * :-----------:|:--------------------------------------:|:----------------------------------------:|:--------------:
   1491      * any state    | CAF--&gt;AUTO mode switch                 | INACTIVE                                 | Mode switch without trigger, initial state must be INACTIVE
   1492      * any state    | CAF--&gt;AUTO mode switch with AF_TRIGGER | trigger-reachable states from INACTIVE   | Mode switch with trigger, INACTIVE is skipped
   1493      * any state    | AUTO--&gt;CAF mode switch                 | passively reachable states from INACTIVE | Mode switch without trigger, passive transient state is skipped</p>
   1494      *
   1495      * @see ACAMERA_CONTROL_AF_MODE
   1496      * @see ACAMERA_CONTROL_MODE
   1497      * @see ACAMERA_CONTROL_SCENE_MODE
   1498      */
   1499     ACAMERA_CONTROL_AF_STATE =                                  // byte (acamera_metadata_enum_android_control_af_state_t)
   1500             ACAMERA_CONTROL_START + 32,
   1501     /**
   1502      * <p>Current state of auto-white balance (AWB) algorithm.</p>
   1503      *
   1504      * <p>Type: byte (acamera_metadata_enum_android_control_awb_state_t)</p>
   1505      *
   1506      * <p>This tag may appear in:
   1507      * <ul>
   1508      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1509      * </ul></p>
   1510      *
   1511      * <p>Switching between or enabling AWB modes (ACAMERA_CONTROL_AWB_MODE) always
   1512      * resets the AWB state to INACTIVE. Similarly, switching between ACAMERA_CONTROL_MODE,
   1513      * or ACAMERA_CONTROL_SCENE_MODE if <code>ACAMERA_CONTROL_MODE == USE_SCENE_MODE</code> resets all
   1514      * the algorithm states to INACTIVE.</p>
   1515      * <p>The camera device can do several state transitions between two results, if it is
   1516      * allowed by the state transition table. So INACTIVE may never actually be seen in
   1517      * a result.</p>
   1518      * <p>The state in the result is the state for this image (in sync with this image): if
   1519      * AWB state becomes CONVERGED, then the image data associated with this result should
   1520      * be good to use.</p>
   1521      * <p>Below are state transition tables for different AWB modes.</p>
   1522      * <p>When <code>ACAMERA_CONTROL_AWB_MODE != AWB_MODE_AUTO</code>:</p>
   1523      * <p>State       | Transition Cause | New State | Notes
   1524      * :------------:|:----------------:|:---------:|:-----------------------:
   1525      * INACTIVE      |                  |INACTIVE   |Camera device auto white balance algorithm is disabled</p>
   1526      * <p>When ACAMERA_CONTROL_AWB_MODE is AWB_MODE_AUTO:</p>
   1527      * <p>State        | Transition Cause                 | New State     | Notes
   1528      * :-------------:|:--------------------------------:|:-------------:|:-----------------:
   1529      * INACTIVE       | Camera device initiates AWB scan | SEARCHING     | Values changing
   1530      * INACTIVE       | ACAMERA_CONTROL_AWB_LOCK is ON    | LOCKED        | Values locked
   1531      * SEARCHING      | Camera device finishes AWB scan  | CONVERGED     | Good values, not changing
   1532      * SEARCHING      | ACAMERA_CONTROL_AWB_LOCK is ON    | LOCKED        | Values locked
   1533      * CONVERGED      | Camera device initiates AWB scan | SEARCHING     | Values changing
   1534      * CONVERGED      | ACAMERA_CONTROL_AWB_LOCK is ON    | LOCKED        | Values locked
   1535      * LOCKED         | ACAMERA_CONTROL_AWB_LOCK is OFF   | SEARCHING     | Values not good after unlock</p>
   1536      * <p>For the above table, the camera device may skip reporting any state changes that happen
   1537      * without application intervention (i.e. mode switch, trigger, locking). Any state that
   1538      * can be skipped in that manner is called a transient state.</p>
   1539      * <p>For example, for this AWB mode (AWB_MODE_AUTO), in addition to the state transitions
   1540      * listed in above table, it is also legal for the camera device to skip one or more
   1541      * transient states between two results. See below table for examples:</p>
   1542      * <p>State        | Transition Cause                 | New State     | Notes
   1543      * :-------------:|:--------------------------------:|:-------------:|:-----------------:
   1544      * INACTIVE       | Camera device finished AWB scan  | CONVERGED     | Values are already good, transient states are skipped by camera device.
   1545      * LOCKED         | ACAMERA_CONTROL_AWB_LOCK is OFF   | CONVERGED     | Values good after unlock, transient states are skipped by camera device.</p>
   1546      *
   1547      * @see ACAMERA_CONTROL_AWB_LOCK
   1548      * @see ACAMERA_CONTROL_AWB_MODE
   1549      * @see ACAMERA_CONTROL_MODE
   1550      * @see ACAMERA_CONTROL_SCENE_MODE
   1551      */
   1552     ACAMERA_CONTROL_AWB_STATE =                                 // byte (acamera_metadata_enum_android_control_awb_state_t)
   1553             ACAMERA_CONTROL_START + 34,
   1554     /**
   1555      * <p>Whether the camera device supports ACAMERA_CONTROL_AE_LOCK</p>
   1556      *
   1557      * @see ACAMERA_CONTROL_AE_LOCK
   1558      *
   1559      * <p>Type: byte (acamera_metadata_enum_android_control_ae_lock_available_t)</p>
   1560      *
   1561      * <p>This tag may appear in:
   1562      * <ul>
   1563      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1564      * </ul></p>
   1565      *
   1566      * <p>Devices with MANUAL_SENSOR capability or BURST_CAPTURE capability will always
   1567      * list <code>true</code>. This includes FULL devices.</p>
   1568      */
   1569     ACAMERA_CONTROL_AE_LOCK_AVAILABLE =                         // byte (acamera_metadata_enum_android_control_ae_lock_available_t)
   1570             ACAMERA_CONTROL_START + 36,
   1571     /**
   1572      * <p>Whether the camera device supports ACAMERA_CONTROL_AWB_LOCK</p>
   1573      *
   1574      * @see ACAMERA_CONTROL_AWB_LOCK
   1575      *
   1576      * <p>Type: byte (acamera_metadata_enum_android_control_awb_lock_available_t)</p>
   1577      *
   1578      * <p>This tag may appear in:
   1579      * <ul>
   1580      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1581      * </ul></p>
   1582      *
   1583      * <p>Devices with MANUAL_POST_PROCESSING capability or BURST_CAPTURE capability will
   1584      * always list <code>true</code>. This includes FULL devices.</p>
   1585      */
   1586     ACAMERA_CONTROL_AWB_LOCK_AVAILABLE =                        // byte (acamera_metadata_enum_android_control_awb_lock_available_t)
   1587             ACAMERA_CONTROL_START + 37,
   1588     /**
   1589      * <p>List of control modes for ACAMERA_CONTROL_MODE that are supported by this camera
   1590      * device.</p>
   1591      *
   1592      * @see ACAMERA_CONTROL_MODE
   1593      *
   1594      * <p>Type: byte[n]</p>
   1595      *
   1596      * <p>This tag may appear in:
   1597      * <ul>
   1598      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1599      * </ul></p>
   1600      *
   1601      * <p>This list contains control modes that can be set for the camera device.
   1602      * LEGACY mode devices will always support AUTO mode. LIMITED and FULL
   1603      * devices will always support OFF, AUTO modes.</p>
   1604      */
   1605     ACAMERA_CONTROL_AVAILABLE_MODES =                           // byte[n]
   1606             ACAMERA_CONTROL_START + 38,
   1607     /**
   1608      * <p>Range of boosts for ACAMERA_CONTROL_POST_RAW_SENSITIVITY_BOOST supported
   1609      * by this camera device.</p>
   1610      *
   1611      * @see ACAMERA_CONTROL_POST_RAW_SENSITIVITY_BOOST
   1612      *
   1613      * <p>Type: int32[2]</p>
   1614      *
   1615      * <p>This tag may appear in:
   1616      * <ul>
   1617      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1618      * </ul></p>
   1619      *
   1620      * <p>Devices support post RAW sensitivity boost  will advertise
   1621      * ACAMERA_CONTROL_POST_RAW_SENSITIVITY_BOOST key for controling
   1622      * post RAW sensitivity boost.</p>
   1623      * <p>This key will be <code>null</code> for devices that do not support any RAW format
   1624      * outputs. For devices that do support RAW format outputs, this key will always
   1625      * present, and if a device does not support post RAW sensitivity boost, it will
   1626      * list <code>(100, 100)</code> in this key.</p>
   1627      *
   1628      * @see ACAMERA_CONTROL_POST_RAW_SENSITIVITY_BOOST
   1629      */
   1630     ACAMERA_CONTROL_POST_RAW_SENSITIVITY_BOOST_RANGE =          // int32[2]
   1631             ACAMERA_CONTROL_START + 39,
   1632     /**
   1633      * <p>The amount of additional sensitivity boost applied to output images
   1634      * after RAW sensor data is captured.</p>
   1635      *
   1636      * <p>Type: int32</p>
   1637      *
   1638      * <p>This tag may appear in:
   1639      * <ul>
   1640      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1641      *   <li>ACaptureRequest</li>
   1642      * </ul></p>
   1643      *
   1644      * <p>Some camera devices support additional digital sensitivity boosting in the
   1645      * camera processing pipeline after sensor RAW image is captured.
   1646      * Such a boost will be applied to YUV/JPEG format output images but will not
   1647      * have effect on RAW output formats like RAW_SENSOR, RAW10, RAW12 or RAW_OPAQUE.</p>
   1648      * <p>This key will be <code>null</code> for devices that do not support any RAW format
   1649      * outputs. For devices that do support RAW format outputs, this key will always
   1650      * present, and if a device does not support post RAW sensitivity boost, it will
   1651      * list <code>100</code> in this key.</p>
   1652      * <p>If the camera device cannot apply the exact boost requested, it will reduce the
   1653      * boost to the nearest supported value.
   1654      * The final boost value used will be available in the output capture result.</p>
   1655      * <p>For devices that support post RAW sensitivity boost, the YUV/JPEG output images
   1656      * of such device will have the total sensitivity of
   1657      * <code>ACAMERA_SENSOR_SENSITIVITY * ACAMERA_CONTROL_POST_RAW_SENSITIVITY_BOOST / 100</code>
   1658      * The sensitivity of RAW format images will always be <code>ACAMERA_SENSOR_SENSITIVITY</code></p>
   1659      * <p>This control is only effective if ACAMERA_CONTROL_AE_MODE or ACAMERA_CONTROL_MODE is set to
   1660      * OFF; otherwise the auto-exposure algorithm will override this value.</p>
   1661      *
   1662      * @see ACAMERA_CONTROL_AE_MODE
   1663      * @see ACAMERA_CONTROL_MODE
   1664      * @see ACAMERA_CONTROL_POST_RAW_SENSITIVITY_BOOST
   1665      * @see ACAMERA_SENSOR_SENSITIVITY
   1666      */
   1667     ACAMERA_CONTROL_POST_RAW_SENSITIVITY_BOOST =                // int32
   1668             ACAMERA_CONTROL_START + 40,
   1669     /**
   1670      * <p>Allow camera device to enable zero-shutter-lag mode for requests with
   1671      * ACAMERA_CONTROL_CAPTURE_INTENT == STILL_CAPTURE.</p>
   1672      *
   1673      * @see ACAMERA_CONTROL_CAPTURE_INTENT
   1674      *
   1675      * <p>Type: byte (acamera_metadata_enum_android_control_enable_zsl_t)</p>
   1676      *
   1677      * <p>This tag may appear in:
   1678      * <ul>
   1679      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1680      *   <li>ACaptureRequest</li>
   1681      * </ul></p>
   1682      *
   1683      * <p>If enableZsl is <code>true</code>, the camera device may enable zero-shutter-lag mode for requests with
   1684      * STILL_CAPTURE capture intent. The camera device may use images captured in the past to
   1685      * produce output images for a zero-shutter-lag request. The result metadata including the
   1686      * ACAMERA_SENSOR_TIMESTAMP reflects the source frames used to produce output images.
   1687      * Therefore, the contents of the output images and the result metadata may be out of order
   1688      * compared to previous regular requests. enableZsl does not affect requests with other
   1689      * capture intents.</p>
   1690      * <p>For example, when requests are submitted in the following order:
   1691      *   Request A: enableZsl is ON, ACAMERA_CONTROL_CAPTURE_INTENT is PREVIEW
   1692      *   Request B: enableZsl is ON, ACAMERA_CONTROL_CAPTURE_INTENT is STILL_CAPTURE</p>
   1693      * <p>The output images for request B may have contents captured before the output images for
   1694      * request A, and the result metadata for request B may be older than the result metadata for
   1695      * request A.</p>
   1696      * <p>Note that when enableZsl is <code>true</code>, it is not guaranteed to get output images captured in
   1697      * the past for requests with STILL_CAPTURE capture intent.</p>
   1698      * <p>For applications targeting SDK versions O and newer, the value of enableZsl in
   1699      * TEMPLATE_STILL_CAPTURE template may be <code>true</code>. The value in other templates is always
   1700      * <code>false</code> if present.</p>
   1701      * <p>For applications targeting SDK versions older than O, the value of enableZsl in all
   1702      * capture templates is always <code>false</code> if present.</p>
   1703      * <p>For application-operated ZSL, use CAMERA3_TEMPLATE_ZERO_SHUTTER_LAG template.</p>
   1704      *
   1705      * @see ACAMERA_CONTROL_CAPTURE_INTENT
   1706      * @see ACAMERA_SENSOR_TIMESTAMP
   1707      */
   1708     ACAMERA_CONTROL_ENABLE_ZSL =                                // byte (acamera_metadata_enum_android_control_enable_zsl_t)
   1709             ACAMERA_CONTROL_START + 41,
   1710     /**
   1711      * <p>Whether a significant scene change is detected within the currently-set AF
   1712      * region(s).</p>
   1713      *
   1714      * <p>Type: byte (acamera_metadata_enum_android_control_af_scene_change_t)</p>
   1715      *
   1716      * <p>This tag may appear in:
   1717      * <ul>
   1718      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1719      * </ul></p>
   1720      *
   1721      * <p>When the camera focus routine detects a change in the scene it is looking at,
   1722      * such as a large shift in camera viewpoint, significant motion in the scene, or a
   1723      * significant illumination change, this value will be set to DETECTED for a single capture
   1724      * result. Otherwise the value will be NOT_DETECTED. The threshold for detection is similar
   1725      * to what would trigger a new passive focus scan to begin in CONTINUOUS autofocus modes.</p>
   1726      * <p>This key will be available if the camera device advertises this key via {@link ACAMERA_REQUEST_AVAILABLE_RESULT_KEYS }.</p>
   1727      */
   1728     ACAMERA_CONTROL_AF_SCENE_CHANGE =                           // byte (acamera_metadata_enum_android_control_af_scene_change_t)
   1729             ACAMERA_CONTROL_START + 42,
   1730     ACAMERA_CONTROL_END,
   1731 
   1732     /**
   1733      * <p>Operation mode for edge
   1734      * enhancement.</p>
   1735      *
   1736      * <p>Type: byte (acamera_metadata_enum_android_edge_mode_t)</p>
   1737      *
   1738      * <p>This tag may appear in:
   1739      * <ul>
   1740      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1741      *   <li>ACaptureRequest</li>
   1742      * </ul></p>
   1743      *
   1744      * <p>Edge enhancement improves sharpness and details in the captured image. OFF means
   1745      * no enhancement will be applied by the camera device.</p>
   1746      * <p>FAST/HIGH_QUALITY both mean camera device determined enhancement
   1747      * will be applied. HIGH_QUALITY mode indicates that the
   1748      * camera device will use the highest-quality enhancement algorithms,
   1749      * even if it slows down capture rate. FAST means the camera device will
   1750      * not slow down capture rate when applying edge enhancement. FAST may be the same as OFF if
   1751      * edge enhancement will slow down capture rate. Every output stream will have a similar
   1752      * amount of enhancement applied.</p>
   1753      * <p>ZERO_SHUTTER_LAG is meant to be used by applications that maintain a continuous circular
   1754      * buffer of high-resolution images during preview and reprocess image(s) from that buffer
   1755      * into a final capture when triggered by the user. In this mode, the camera device applies
   1756      * edge enhancement to low-resolution streams (below maximum recording resolution) to
   1757      * maximize preview quality, but does not apply edge enhancement to high-resolution streams,
   1758      * since those will be reprocessed later if necessary.</p>
   1759      * <p>For YUV_REPROCESSING, these FAST/HIGH_QUALITY modes both mean that the camera
   1760      * device will apply FAST/HIGH_QUALITY YUV-domain edge enhancement, respectively.
   1761      * The camera device may adjust its internal edge enhancement parameters for best
   1762      * image quality based on the android.reprocess.effectiveExposureFactor, if it is set.</p>
   1763      */
   1764     ACAMERA_EDGE_MODE =                                         // byte (acamera_metadata_enum_android_edge_mode_t)
   1765             ACAMERA_EDGE_START,
   1766     /**
   1767      * <p>List of edge enhancement modes for ACAMERA_EDGE_MODE that are supported by this camera
   1768      * device.</p>
   1769      *
   1770      * @see ACAMERA_EDGE_MODE
   1771      *
   1772      * <p>Type: byte[n]</p>
   1773      *
   1774      * <p>This tag may appear in:
   1775      * <ul>
   1776      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1777      * </ul></p>
   1778      *
   1779      * <p>Full-capability camera devices must always support OFF; camera devices that support
   1780      * YUV_REPROCESSING or PRIVATE_REPROCESSING will list ZERO_SHUTTER_LAG; all devices will
   1781      * list FAST.</p>
   1782      */
   1783     ACAMERA_EDGE_AVAILABLE_EDGE_MODES =                         // byte[n]
   1784             ACAMERA_EDGE_START + 2,
   1785     ACAMERA_EDGE_END,
   1786 
   1787     /**
   1788      * <p>The desired mode for for the camera device's flash control.</p>
   1789      *
   1790      * <p>Type: byte (acamera_metadata_enum_android_flash_mode_t)</p>
   1791      *
   1792      * <p>This tag may appear in:
   1793      * <ul>
   1794      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1795      *   <li>ACaptureRequest</li>
   1796      * </ul></p>
   1797      *
   1798      * <p>This control is only effective when flash unit is available
   1799      * (<code>ACAMERA_FLASH_INFO_AVAILABLE == true</code>).</p>
   1800      * <p>When this control is used, the ACAMERA_CONTROL_AE_MODE must be set to ON or OFF.
   1801      * Otherwise, the camera device auto-exposure related flash control (ON_AUTO_FLASH,
   1802      * ON_ALWAYS_FLASH, or ON_AUTO_FLASH_REDEYE) will override this control.</p>
   1803      * <p>When set to OFF, the camera device will not fire flash for this capture.</p>
   1804      * <p>When set to SINGLE, the camera device will fire flash regardless of the camera
   1805      * device's auto-exposure routine's result. When used in still capture case, this
   1806      * control should be used along with auto-exposure (AE) precapture metering sequence
   1807      * (ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER), otherwise, the image may be incorrectly exposed.</p>
   1808      * <p>When set to TORCH, the flash will be on continuously. This mode can be used
   1809      * for use cases such as preview, auto-focus assist, still capture, or video recording.</p>
   1810      * <p>The flash status will be reported by ACAMERA_FLASH_STATE in the capture result metadata.</p>
   1811      *
   1812      * @see ACAMERA_CONTROL_AE_MODE
   1813      * @see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
   1814      * @see ACAMERA_FLASH_INFO_AVAILABLE
   1815      * @see ACAMERA_FLASH_STATE
   1816      */
   1817     ACAMERA_FLASH_MODE =                                        // byte (acamera_metadata_enum_android_flash_mode_t)
   1818             ACAMERA_FLASH_START + 2,
   1819     /**
   1820      * <p>Current state of the flash
   1821      * unit.</p>
   1822      *
   1823      * <p>Type: byte (acamera_metadata_enum_android_flash_state_t)</p>
   1824      *
   1825      * <p>This tag may appear in:
   1826      * <ul>
   1827      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1828      * </ul></p>
   1829      *
   1830      * <p>When the camera device doesn't have flash unit
   1831      * (i.e. <code>ACAMERA_FLASH_INFO_AVAILABLE == false</code>), this state will always be UNAVAILABLE.
   1832      * Other states indicate the current flash status.</p>
   1833      * <p>In certain conditions, this will be available on LEGACY devices:</p>
   1834      * <ul>
   1835      * <li>Flash-less cameras always return UNAVAILABLE.</li>
   1836      * <li>Using ACAMERA_CONTROL_AE_MODE <code>==</code> ON_ALWAYS_FLASH
   1837      *    will always return FIRED.</li>
   1838      * <li>Using ACAMERA_FLASH_MODE <code>==</code> TORCH
   1839      *    will always return FIRED.</li>
   1840      * </ul>
   1841      * <p>In all other conditions the state will not be available on
   1842      * LEGACY devices (i.e. it will be <code>null</code>).</p>
   1843      *
   1844      * @see ACAMERA_CONTROL_AE_MODE
   1845      * @see ACAMERA_FLASH_INFO_AVAILABLE
   1846      * @see ACAMERA_FLASH_MODE
   1847      */
   1848     ACAMERA_FLASH_STATE =                                       // byte (acamera_metadata_enum_android_flash_state_t)
   1849             ACAMERA_FLASH_START + 5,
   1850     ACAMERA_FLASH_END,
   1851 
   1852     /**
   1853      * <p>Whether this camera device has a
   1854      * flash unit.</p>
   1855      *
   1856      * <p>Type: byte (acamera_metadata_enum_android_flash_info_available_t)</p>
   1857      *
   1858      * <p>This tag may appear in:
   1859      * <ul>
   1860      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1861      * </ul></p>
   1862      *
   1863      * <p>Will be <code>false</code> if no flash is available.</p>
   1864      * <p>If there is no flash unit, none of the flash controls do
   1865      * anything.</p>
   1866      */
   1867     ACAMERA_FLASH_INFO_AVAILABLE =                              // byte (acamera_metadata_enum_android_flash_info_available_t)
   1868             ACAMERA_FLASH_INFO_START,
   1869     ACAMERA_FLASH_INFO_END,
   1870 
   1871     /**
   1872      * <p>Operational mode for hot pixel correction.</p>
   1873      *
   1874      * <p>Type: byte (acamera_metadata_enum_android_hot_pixel_mode_t)</p>
   1875      *
   1876      * <p>This tag may appear in:
   1877      * <ul>
   1878      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1879      *   <li>ACaptureRequest</li>
   1880      * </ul></p>
   1881      *
   1882      * <p>Hotpixel correction interpolates out, or otherwise removes, pixels
   1883      * that do not accurately measure the incoming light (i.e. pixels that
   1884      * are stuck at an arbitrary value or are oversensitive).</p>
   1885      */
   1886     ACAMERA_HOT_PIXEL_MODE =                                    // byte (acamera_metadata_enum_android_hot_pixel_mode_t)
   1887             ACAMERA_HOT_PIXEL_START,
   1888     /**
   1889      * <p>List of hot pixel correction modes for ACAMERA_HOT_PIXEL_MODE that are supported by this
   1890      * camera device.</p>
   1891      *
   1892      * @see ACAMERA_HOT_PIXEL_MODE
   1893      *
   1894      * <p>Type: byte[n]</p>
   1895      *
   1896      * <p>This tag may appear in:
   1897      * <ul>
   1898      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   1899      * </ul></p>
   1900      *
   1901      * <p>FULL mode camera devices will always support FAST.</p>
   1902      */
   1903     ACAMERA_HOT_PIXEL_AVAILABLE_HOT_PIXEL_MODES =               // byte[n]
   1904             ACAMERA_HOT_PIXEL_START + 1,
   1905     ACAMERA_HOT_PIXEL_END,
   1906 
   1907     /**
   1908      * <p>GPS coordinates to include in output JPEG
   1909      * EXIF.</p>
   1910      *
   1911      * <p>Type: double[3]</p>
   1912      *
   1913      * <p>This tag may appear in:
   1914      * <ul>
   1915      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1916      *   <li>ACaptureRequest</li>
   1917      * </ul></p>
   1918      *
   1919      * <p>This tag is also used for HEIC image capture.</p>
   1920      */
   1921     ACAMERA_JPEG_GPS_COORDINATES =                              // double[3]
   1922             ACAMERA_JPEG_START,
   1923     /**
   1924      * <p>32 characters describing GPS algorithm to
   1925      * include in EXIF.</p>
   1926      *
   1927      * <p>Type: byte</p>
   1928      *
   1929      * <p>This tag may appear in:
   1930      * <ul>
   1931      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1932      *   <li>ACaptureRequest</li>
   1933      * </ul></p>
   1934      *
   1935      * <p>This tag is also used for HEIC image capture.</p>
   1936      */
   1937     ACAMERA_JPEG_GPS_PROCESSING_METHOD =                        // byte
   1938             ACAMERA_JPEG_START + 1,
   1939     /**
   1940      * <p>Time GPS fix was made to include in
   1941      * EXIF.</p>
   1942      *
   1943      * <p>Type: int64</p>
   1944      *
   1945      * <p>This tag may appear in:
   1946      * <ul>
   1947      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1948      *   <li>ACaptureRequest</li>
   1949      * </ul></p>
   1950      *
   1951      * <p>This tag is also used for HEIC image capture.</p>
   1952      */
   1953     ACAMERA_JPEG_GPS_TIMESTAMP =                                // int64
   1954             ACAMERA_JPEG_START + 2,
   1955     /**
   1956      * <p>The orientation for a JPEG image.</p>
   1957      *
   1958      * <p>Type: int32</p>
   1959      *
   1960      * <p>This tag may appear in:
   1961      * <ul>
   1962      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   1963      *   <li>ACaptureRequest</li>
   1964      * </ul></p>
   1965      *
   1966      * <p>The clockwise rotation angle in degrees, relative to the orientation
   1967      * to the camera, that the JPEG picture needs to be rotated by, to be viewed
   1968      * upright.</p>
   1969      * <p>Camera devices may either encode this value into the JPEG EXIF header, or
   1970      * rotate the image data to match this orientation. When the image data is rotated,
   1971      * the thumbnail data will also be rotated.</p>
   1972      * <p>Note that this orientation is relative to the orientation of the camera sensor, given
   1973      * by ACAMERA_SENSOR_ORIENTATION.</p>
   1974      * <p>To translate from the device orientation given by the Android sensor APIs for camera
   1975      * sensors which are not EXTERNAL, the following sample code may be used:</p>
   1976      * <pre><code>private int getJpegOrientation(CameraCharacteristics c, int deviceOrientation) {
   1977      *     if (deviceOrientation == android.view.OrientationEventListener.ORIENTATION_UNKNOWN) return 0;
   1978      *     int sensorOrientation = c.get(CameraCharacteristics.SENSOR_ORIENTATION);
   1979      *
   1980      *     // Round device orientation to a multiple of 90
   1981      *     deviceOrientation = (deviceOrientation + 45) / 90 * 90;
   1982      *
   1983      *     // Reverse device orientation for front-facing cameras
   1984      *     boolean facingFront = c.get(CameraCharacteristics.LENS_FACING) == CameraCharacteristics.LENS_FACING_FRONT;
   1985      *     if (facingFront) deviceOrientation = -deviceOrientation;
   1986      *
   1987      *     // Calculate desired JPEG orientation relative to camera orientation to make
   1988      *     // the image upright relative to the device orientation
   1989      *     int jpegOrientation = (sensorOrientation + deviceOrientation + 360) % 360;
   1990      *
   1991      *     return jpegOrientation;
   1992      * }
   1993      * </code></pre>
   1994      * <p>For EXTERNAL cameras the sensor orientation will always be set to 0 and the facing will
   1995      * also be set to EXTERNAL. The above code is not relevant in such case.</p>
   1996      * <p>This tag is also used to describe the orientation of the HEIC image capture, in which
   1997      * case the rotation is reflected by
   1998      * <a href="https://developer.android.com/reference/android/media/ExifInterface.html#TAG_ORIENTATION">EXIF orientation flag</a>, and not by
   1999      * rotating the image data itself.</p>
   2000      *
   2001      * @see ACAMERA_SENSOR_ORIENTATION
   2002      */
   2003     ACAMERA_JPEG_ORIENTATION =                                  // int32
   2004             ACAMERA_JPEG_START + 3,
   2005     /**
   2006      * <p>Compression quality of the final JPEG
   2007      * image.</p>
   2008      *
   2009      * <p>Type: byte</p>
   2010      *
   2011      * <p>This tag may appear in:
   2012      * <ul>
   2013      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2014      *   <li>ACaptureRequest</li>
   2015      * </ul></p>
   2016      *
   2017      * <p>85-95 is typical usage range. This tag is also used to describe the quality
   2018      * of the HEIC image capture.</p>
   2019      */
   2020     ACAMERA_JPEG_QUALITY =                                      // byte
   2021             ACAMERA_JPEG_START + 4,
   2022     /**
   2023      * <p>Compression quality of JPEG
   2024      * thumbnail.</p>
   2025      *
   2026      * <p>Type: byte</p>
   2027      *
   2028      * <p>This tag may appear in:
   2029      * <ul>
   2030      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2031      *   <li>ACaptureRequest</li>
   2032      * </ul></p>
   2033      *
   2034      * <p>This tag is also used to describe the quality of the HEIC image capture.</p>
   2035      */
   2036     ACAMERA_JPEG_THUMBNAIL_QUALITY =                            // byte
   2037             ACAMERA_JPEG_START + 5,
   2038     /**
   2039      * <p>Resolution of embedded JPEG thumbnail.</p>
   2040      *
   2041      * <p>Type: int32[2]</p>
   2042      *
   2043      * <p>This tag may appear in:
   2044      * <ul>
   2045      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2046      *   <li>ACaptureRequest</li>
   2047      * </ul></p>
   2048      *
   2049      * <p>When set to (0, 0) value, the JPEG EXIF will not contain thumbnail,
   2050      * but the captured JPEG will still be a valid image.</p>
   2051      * <p>For best results, when issuing a request for a JPEG image, the thumbnail size selected
   2052      * should have the same aspect ratio as the main JPEG output.</p>
   2053      * <p>If the thumbnail image aspect ratio differs from the JPEG primary image aspect
   2054      * ratio, the camera device creates the thumbnail by cropping it from the primary image.
   2055      * For example, if the primary image has 4:3 aspect ratio, the thumbnail image has
   2056      * 16:9 aspect ratio, the primary image will be cropped vertically (letterbox) to
   2057      * generate the thumbnail image. The thumbnail image will always have a smaller Field
   2058      * Of View (FOV) than the primary image when aspect ratios differ.</p>
   2059      * <p>When an ACAMERA_JPEG_ORIENTATION of non-zero degree is requested,
   2060      * the camera device will handle thumbnail rotation in one of the following ways:</p>
   2061      * <ul>
   2062      * <li>Set the <a href="https://developer.android.com/reference/android/media/ExifInterface.html#TAG_ORIENTATION">EXIF orientation flag</a>
   2063      *   and keep jpeg and thumbnail image data unrotated.</li>
   2064      * <li>Rotate the jpeg and thumbnail image data and not set
   2065      *   <a href="https://developer.android.com/reference/android/media/ExifInterface.html#TAG_ORIENTATION">EXIF orientation flag</a>. In this
   2066      *   case, LIMITED or FULL hardware level devices will report rotated thumnail size in
   2067      *   capture result, so the width and height will be interchanged if 90 or 270 degree
   2068      *   orientation is requested. LEGACY device will always report unrotated thumbnail
   2069      *   size.</li>
   2070      * </ul>
   2071      * <p>The tag is also used as thumbnail size for HEIC image format capture, in which case the
   2072      * the thumbnail rotation is reflected by
   2073      * <a href="https://developer.android.com/reference/android/media/ExifInterface.html#TAG_ORIENTATION">EXIF orientation flag</a>, and not by
   2074      * rotating the thumbnail data itself.</p>
   2075      *
   2076      * @see ACAMERA_JPEG_ORIENTATION
   2077      */
   2078     ACAMERA_JPEG_THUMBNAIL_SIZE =                               // int32[2]
   2079             ACAMERA_JPEG_START + 6,
   2080     /**
   2081      * <p>List of JPEG thumbnail sizes for ACAMERA_JPEG_THUMBNAIL_SIZE supported by this
   2082      * camera device.</p>
   2083      *
   2084      * @see ACAMERA_JPEG_THUMBNAIL_SIZE
   2085      *
   2086      * <p>Type: int32[2*n]</p>
   2087      *
   2088      * <p>This tag may appear in:
   2089      * <ul>
   2090      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2091      * </ul></p>
   2092      *
   2093      * <p>This list will include at least one non-zero resolution, plus <code>(0,0)</code> for indicating no
   2094      * thumbnail should be generated.</p>
   2095      * <p>Below condiditions will be satisfied for this size list:</p>
   2096      * <ul>
   2097      * <li>The sizes will be sorted by increasing pixel area (width x height).
   2098      * If several resolutions have the same area, they will be sorted by increasing width.</li>
   2099      * <li>The aspect ratio of the largest thumbnail size will be same as the
   2100      * aspect ratio of largest JPEG output size in ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS.
   2101      * The largest size is defined as the size that has the largest pixel area
   2102      * in a given size list.</li>
   2103      * <li>Each output JPEG size in ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS will have at least
   2104      * one corresponding size that has the same aspect ratio in availableThumbnailSizes,
   2105      * and vice versa.</li>
   2106      * <li>All non-<code>(0, 0)</code> sizes will have non-zero widths and heights.</li>
   2107      * </ul>
   2108      * <p>This list is also used as supported thumbnail sizes for HEIC image format capture.</p>
   2109      *
   2110      * @see ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS
   2111      */
   2112     ACAMERA_JPEG_AVAILABLE_THUMBNAIL_SIZES =                    // int32[2*n]
   2113             ACAMERA_JPEG_START + 7,
   2114     ACAMERA_JPEG_END,
   2115 
   2116     /**
   2117      * <p>The desired lens aperture size, as a ratio of lens focal length to the
   2118      * effective aperture diameter.</p>
   2119      *
   2120      * <p>Type: float</p>
   2121      *
   2122      * <p>This tag may appear in:
   2123      * <ul>
   2124      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2125      *   <li>ACaptureRequest</li>
   2126      * </ul></p>
   2127      *
   2128      * <p>Setting this value is only supported on the camera devices that have a variable
   2129      * aperture lens.</p>
   2130      * <p>When this is supported and ACAMERA_CONTROL_AE_MODE is OFF,
   2131      * this can be set along with ACAMERA_SENSOR_EXPOSURE_TIME,
   2132      * ACAMERA_SENSOR_SENSITIVITY, and ACAMERA_SENSOR_FRAME_DURATION
   2133      * to achieve manual exposure control.</p>
   2134      * <p>The requested aperture value may take several frames to reach the
   2135      * requested value; the camera device will report the current (intermediate)
   2136      * aperture size in capture result metadata while the aperture is changing.
   2137      * While the aperture is still changing, ACAMERA_LENS_STATE will be set to MOVING.</p>
   2138      * <p>When this is supported and ACAMERA_CONTROL_AE_MODE is one of
   2139      * the ON modes, this will be overridden by the camera device
   2140      * auto-exposure algorithm, the overridden values are then provided
   2141      * back to the user in the corresponding result.</p>
   2142      *
   2143      * @see ACAMERA_CONTROL_AE_MODE
   2144      * @see ACAMERA_LENS_STATE
   2145      * @see ACAMERA_SENSOR_EXPOSURE_TIME
   2146      * @see ACAMERA_SENSOR_FRAME_DURATION
   2147      * @see ACAMERA_SENSOR_SENSITIVITY
   2148      */
   2149     ACAMERA_LENS_APERTURE =                                     // float
   2150             ACAMERA_LENS_START,
   2151     /**
   2152      * <p>The desired setting for the lens neutral density filter(s).</p>
   2153      *
   2154      * <p>Type: float</p>
   2155      *
   2156      * <p>This tag may appear in:
   2157      * <ul>
   2158      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2159      *   <li>ACaptureRequest</li>
   2160      * </ul></p>
   2161      *
   2162      * <p>This control will not be supported on most camera devices.</p>
   2163      * <p>Lens filters are typically used to lower the amount of light the
   2164      * sensor is exposed to (measured in steps of EV). As used here, an EV
   2165      * step is the standard logarithmic representation, which are
   2166      * non-negative, and inversely proportional to the amount of light
   2167      * hitting the sensor.  For example, setting this to 0 would result
   2168      * in no reduction of the incoming light, and setting this to 2 would
   2169      * mean that the filter is set to reduce incoming light by two stops
   2170      * (allowing 1/4 of the prior amount of light to the sensor).</p>
   2171      * <p>It may take several frames before the lens filter density changes
   2172      * to the requested value. While the filter density is still changing,
   2173      * ACAMERA_LENS_STATE will be set to MOVING.</p>
   2174      *
   2175      * @see ACAMERA_LENS_STATE
   2176      */
   2177     ACAMERA_LENS_FILTER_DENSITY =                               // float
   2178             ACAMERA_LENS_START + 1,
   2179     /**
   2180      * <p>The desired lens focal length; used for optical zoom.</p>
   2181      *
   2182      * <p>Type: float</p>
   2183      *
   2184      * <p>This tag may appear in:
   2185      * <ul>
   2186      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2187      *   <li>ACaptureRequest</li>
   2188      * </ul></p>
   2189      *
   2190      * <p>This setting controls the physical focal length of the camera
   2191      * device's lens. Changing the focal length changes the field of
   2192      * view of the camera device, and is usually used for optical zoom.</p>
   2193      * <p>Like ACAMERA_LENS_FOCUS_DISTANCE and ACAMERA_LENS_APERTURE, this
   2194      * setting won't be applied instantaneously, and it may take several
   2195      * frames before the lens can change to the requested focal length.
   2196      * While the focal length is still changing, ACAMERA_LENS_STATE will
   2197      * be set to MOVING.</p>
   2198      * <p>Optical zoom will not be supported on most devices.</p>
   2199      *
   2200      * @see ACAMERA_LENS_APERTURE
   2201      * @see ACAMERA_LENS_FOCUS_DISTANCE
   2202      * @see ACAMERA_LENS_STATE
   2203      */
   2204     ACAMERA_LENS_FOCAL_LENGTH =                                 // float
   2205             ACAMERA_LENS_START + 2,
   2206     /**
   2207      * <p>Desired distance to plane of sharpest focus,
   2208      * measured from frontmost surface of the lens.</p>
   2209      *
   2210      * <p>Type: float</p>
   2211      *
   2212      * <p>This tag may appear in:
   2213      * <ul>
   2214      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2215      *   <li>ACaptureRequest</li>
   2216      * </ul></p>
   2217      *
   2218      * <p>Should be zero for fixed-focus cameras</p>
   2219      */
   2220     ACAMERA_LENS_FOCUS_DISTANCE =                               // float
   2221             ACAMERA_LENS_START + 3,
   2222     /**
   2223      * <p>Sets whether the camera device uses optical image stabilization (OIS)
   2224      * when capturing images.</p>
   2225      *
   2226      * <p>Type: byte (acamera_metadata_enum_android_lens_optical_stabilization_mode_t)</p>
   2227      *
   2228      * <p>This tag may appear in:
   2229      * <ul>
   2230      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2231      *   <li>ACaptureRequest</li>
   2232      * </ul></p>
   2233      *
   2234      * <p>OIS is used to compensate for motion blur due to small
   2235      * movements of the camera during capture. Unlike digital image
   2236      * stabilization (ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE), OIS
   2237      * makes use of mechanical elements to stabilize the camera
   2238      * sensor, and thus allows for longer exposure times before
   2239      * camera shake becomes apparent.</p>
   2240      * <p>Switching between different optical stabilization modes may take several
   2241      * frames to initialize, the camera device will report the current mode in
   2242      * capture result metadata. For example, When "ON" mode is requested, the
   2243      * optical stabilization modes in the first several capture results may still
   2244      * be "OFF", and it will become "ON" when the initialization is done.</p>
   2245      * <p>If a camera device supports both OIS and digital image stabilization
   2246      * (ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE), turning both modes on may produce undesirable
   2247      * interaction, so it is recommended not to enable both at the same time.</p>
   2248      * <p>Not all devices will support OIS; see
   2249      * ACAMERA_LENS_INFO_AVAILABLE_OPTICAL_STABILIZATION for
   2250      * available controls.</p>
   2251      *
   2252      * @see ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE
   2253      * @see ACAMERA_LENS_INFO_AVAILABLE_OPTICAL_STABILIZATION
   2254      */
   2255     ACAMERA_LENS_OPTICAL_STABILIZATION_MODE =                   // byte (acamera_metadata_enum_android_lens_optical_stabilization_mode_t)
   2256             ACAMERA_LENS_START + 4,
   2257     /**
   2258      * <p>Direction the camera faces relative to
   2259      * device screen.</p>
   2260      *
   2261      * <p>Type: byte (acamera_metadata_enum_android_lens_facing_t)</p>
   2262      *
   2263      * <p>This tag may appear in:
   2264      * <ul>
   2265      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2266      * </ul></p>
   2267      *
   2268      */
   2269     ACAMERA_LENS_FACING =                                       // byte (acamera_metadata_enum_android_lens_facing_t)
   2270             ACAMERA_LENS_START + 5,
   2271     /**
   2272      * <p>The orientation of the camera relative to the sensor
   2273      * coordinate system.</p>
   2274      *
   2275      * <p>Type: float[4]</p>
   2276      *
   2277      * <p>This tag may appear in:
   2278      * <ul>
   2279      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2280      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2281      * </ul></p>
   2282      *
   2283      * <p>The four coefficients that describe the quaternion
   2284      * rotation from the Android sensor coordinate system to a
   2285      * camera-aligned coordinate system where the X-axis is
   2286      * aligned with the long side of the image sensor, the Y-axis
   2287      * is aligned with the short side of the image sensor, and
   2288      * the Z-axis is aligned with the optical axis of the sensor.</p>
   2289      * <p>To convert from the quaternion coefficients <code>(x,y,z,w)</code>
   2290      * to the axis of rotation <code>(a_x, a_y, a_z)</code> and rotation
   2291      * amount <code>theta</code>, the following formulas can be used:</p>
   2292      * <pre><code> theta = 2 * acos(w)
   2293      * a_x = x / sin(theta/2)
   2294      * a_y = y / sin(theta/2)
   2295      * a_z = z / sin(theta/2)
   2296      * </code></pre>
   2297      * <p>To create a 3x3 rotation matrix that applies the rotation
   2298      * defined by this quaternion, the following matrix can be
   2299      * used:</p>
   2300      * <pre><code>R = [ 1 - 2y^2 - 2z^2,       2xy - 2zw,       2xz + 2yw,
   2301      *            2xy + 2zw, 1 - 2x^2 - 2z^2,       2yz - 2xw,
   2302      *            2xz - 2yw,       2yz + 2xw, 1 - 2x^2 - 2y^2 ]
   2303      * </code></pre>
   2304      * <p>This matrix can then be used to apply the rotation to a
   2305      *  column vector point with</p>
   2306      * <p><code>p' = Rp</code></p>
   2307      * <p>where <code>p</code> is in the device sensor coordinate system, and
   2308      *  <code>p'</code> is in the camera-oriented coordinate system.</p>
   2309      */
   2310     ACAMERA_LENS_POSE_ROTATION =                                // float[4]
   2311             ACAMERA_LENS_START + 6,
   2312     /**
   2313      * <p>Position of the camera optical center.</p>
   2314      *
   2315      * <p>Type: float[3]</p>
   2316      *
   2317      * <p>This tag may appear in:
   2318      * <ul>
   2319      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2320      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2321      * </ul></p>
   2322      *
   2323      * <p>The position of the camera device's lens optical center,
   2324      * as a three-dimensional vector <code>(x,y,z)</code>.</p>
   2325      * <p>Prior to Android P, or when ACAMERA_LENS_POSE_REFERENCE is PRIMARY_CAMERA, this position
   2326      * is relative to the optical center of the largest camera device facing in the same
   2327      * direction as this camera, in the <a href="https://developer.android.com/reference/android/hardware/SensorEvent.html">Android sensor
   2328      * coordinate axes</a>. Note that only the axis definitions are shared with the sensor
   2329      * coordinate system, but not the origin.</p>
   2330      * <p>If this device is the largest or only camera device with a given facing, then this
   2331      * position will be <code>(0, 0, 0)</code>; a camera device with a lens optical center located 3 cm
   2332      * from the main sensor along the +X axis (to the right from the user's perspective) will
   2333      * report <code>(0.03, 0, 0)</code>.  Note that this means that, for many computer vision
   2334      * applications, the position needs to be negated to convert it to a translation from the
   2335      * camera to the origin.</p>
   2336      * <p>To transform a pixel coordinates between two cameras facing the same direction, first
   2337      * the source camera ACAMERA_LENS_DISTORTION must be corrected for.  Then the source
   2338      * camera ACAMERA_LENS_INTRINSIC_CALIBRATION needs to be applied, followed by the
   2339      * ACAMERA_LENS_POSE_ROTATION of the source camera, the translation of the source camera
   2340      * relative to the destination camera, the ACAMERA_LENS_POSE_ROTATION of the destination
   2341      * camera, and finally the inverse of ACAMERA_LENS_INTRINSIC_CALIBRATION of the destination
   2342      * camera. This obtains a radial-distortion-free coordinate in the destination camera pixel
   2343      * coordinates.</p>
   2344      * <p>To compare this against a real image from the destination camera, the destination camera
   2345      * image then needs to be corrected for radial distortion before comparison or sampling.</p>
   2346      * <p>When ACAMERA_LENS_POSE_REFERENCE is GYROSCOPE, then this position is relative to
   2347      * the center of the primary gyroscope on the device. The axis definitions are the same as
   2348      * with PRIMARY_CAMERA.</p>
   2349      *
   2350      * @see ACAMERA_LENS_DISTORTION
   2351      * @see ACAMERA_LENS_INTRINSIC_CALIBRATION
   2352      * @see ACAMERA_LENS_POSE_REFERENCE
   2353      * @see ACAMERA_LENS_POSE_ROTATION
   2354      */
   2355     ACAMERA_LENS_POSE_TRANSLATION =                             // float[3]
   2356             ACAMERA_LENS_START + 7,
   2357     /**
   2358      * <p>The range of scene distances that are in
   2359      * sharp focus (depth of field).</p>
   2360      *
   2361      * <p>Type: float[2]</p>
   2362      *
   2363      * <p>This tag may appear in:
   2364      * <ul>
   2365      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2366      * </ul></p>
   2367      *
   2368      * <p>If variable focus not supported, can still report
   2369      * fixed depth of field range</p>
   2370      */
   2371     ACAMERA_LENS_FOCUS_RANGE =                                  // float[2]
   2372             ACAMERA_LENS_START + 8,
   2373     /**
   2374      * <p>Current lens status.</p>
   2375      *
   2376      * <p>Type: byte (acamera_metadata_enum_android_lens_state_t)</p>
   2377      *
   2378      * <p>This tag may appear in:
   2379      * <ul>
   2380      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2381      * </ul></p>
   2382      *
   2383      * <p>For lens parameters ACAMERA_LENS_FOCAL_LENGTH, ACAMERA_LENS_FOCUS_DISTANCE,
   2384      * ACAMERA_LENS_FILTER_DENSITY and ACAMERA_LENS_APERTURE, when changes are requested,
   2385      * they may take several frames to reach the requested values. This state indicates
   2386      * the current status of the lens parameters.</p>
   2387      * <p>When the state is STATIONARY, the lens parameters are not changing. This could be
   2388      * either because the parameters are all fixed, or because the lens has had enough
   2389      * time to reach the most recently-requested values.
   2390      * If all these lens parameters are not changable for a camera device, as listed below:</p>
   2391      * <ul>
   2392      * <li>Fixed focus (<code>ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE == 0</code>), which means
   2393      * ACAMERA_LENS_FOCUS_DISTANCE parameter will always be 0.</li>
   2394      * <li>Fixed focal length (ACAMERA_LENS_INFO_AVAILABLE_FOCAL_LENGTHS contains single value),
   2395      * which means the optical zoom is not supported.</li>
   2396      * <li>No ND filter (ACAMERA_LENS_INFO_AVAILABLE_FILTER_DENSITIES contains only 0).</li>
   2397      * <li>Fixed aperture (ACAMERA_LENS_INFO_AVAILABLE_APERTURES contains single value).</li>
   2398      * </ul>
   2399      * <p>Then this state will always be STATIONARY.</p>
   2400      * <p>When the state is MOVING, it indicates that at least one of the lens parameters
   2401      * is changing.</p>
   2402      *
   2403      * @see ACAMERA_LENS_APERTURE
   2404      * @see ACAMERA_LENS_FILTER_DENSITY
   2405      * @see ACAMERA_LENS_FOCAL_LENGTH
   2406      * @see ACAMERA_LENS_FOCUS_DISTANCE
   2407      * @see ACAMERA_LENS_INFO_AVAILABLE_APERTURES
   2408      * @see ACAMERA_LENS_INFO_AVAILABLE_FILTER_DENSITIES
   2409      * @see ACAMERA_LENS_INFO_AVAILABLE_FOCAL_LENGTHS
   2410      * @see ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE
   2411      */
   2412     ACAMERA_LENS_STATE =                                        // byte (acamera_metadata_enum_android_lens_state_t)
   2413             ACAMERA_LENS_START + 9,
   2414     /**
   2415      * <p>The parameters for this camera device's intrinsic
   2416      * calibration.</p>
   2417      *
   2418      * <p>Type: float[5]</p>
   2419      *
   2420      * <p>This tag may appear in:
   2421      * <ul>
   2422      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2423      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2424      * </ul></p>
   2425      *
   2426      * <p>The five calibration parameters that describe the
   2427      * transform from camera-centric 3D coordinates to sensor
   2428      * pixel coordinates:</p>
   2429      * <pre><code>[f_x, f_y, c_x, c_y, s]
   2430      * </code></pre>
   2431      * <p>Where <code>f_x</code> and <code>f_y</code> are the horizontal and vertical
   2432      * focal lengths, <code>[c_x, c_y]</code> is the position of the optical
   2433      * axis, and <code>s</code> is a skew parameter for the sensor plane not
   2434      * being aligned with the lens plane.</p>
   2435      * <p>These are typically used within a transformation matrix K:</p>
   2436      * <pre><code>K = [ f_x,   s, c_x,
   2437      *        0, f_y, c_y,
   2438      *        0    0,   1 ]
   2439      * </code></pre>
   2440      * <p>which can then be combined with the camera pose rotation
   2441      * <code>R</code> and translation <code>t</code> (ACAMERA_LENS_POSE_ROTATION and
   2442      * ACAMERA_LENS_POSE_TRANSLATION, respectively) to calculate the
   2443      * complete transform from world coordinates to pixel
   2444      * coordinates:</p>
   2445      * <pre><code>P = [ K 0   * [ R -Rt
   2446      *      0 1 ]      0 1 ]
   2447      * </code></pre>
   2448      * <p>(Note the negation of poseTranslation when mapping from camera
   2449      * to world coordinates, and multiplication by the rotation).</p>
   2450      * <p>With <code>p_w</code> being a point in the world coordinate system
   2451      * and <code>p_s</code> being a point in the camera active pixel array
   2452      * coordinate system, and with the mapping including the
   2453      * homogeneous division by z:</p>
   2454      * <pre><code> p_h = (x_h, y_h, z_h) = P p_w
   2455      * p_s = p_h / z_h
   2456      * </code></pre>
   2457      * <p>so <code>[x_s, y_s]</code> is the pixel coordinates of the world
   2458      * point, <code>z_s = 1</code>, and <code>w_s</code> is a measurement of disparity
   2459      * (depth) in pixel coordinates.</p>
   2460      * <p>Note that the coordinate system for this transform is the
   2461      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE system,
   2462      * where <code>(0,0)</code> is the top-left of the
   2463      * preCorrectionActiveArraySize rectangle. Once the pose and
   2464      * intrinsic calibration transforms have been applied to a
   2465      * world point, then the ACAMERA_LENS_DISTORTION
   2466      * transform needs to be applied, and the result adjusted to
   2467      * be in the ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE coordinate
   2468      * system (where <code>(0, 0)</code> is the top-left of the
   2469      * activeArraySize rectangle), to determine the final pixel
   2470      * coordinate of the world point for processed (non-RAW)
   2471      * output buffers.</p>
   2472      * <p>For camera devices, the center of pixel <code>(x,y)</code> is located at
   2473      * coordinate <code>(x + 0.5, y + 0.5)</code>.  So on a device with a
   2474      * precorrection active array of size <code>(10,10)</code>, the valid pixel
   2475      * indices go from <code>(0,0)-(9,9)</code>, and an perfectly-built camera would
   2476      * have an optical center at the exact center of the pixel grid, at
   2477      * coordinates <code>(5.0, 5.0)</code>, which is the top-left corner of pixel
   2478      * <code>(5,5)</code>.</p>
   2479      *
   2480      * @see ACAMERA_LENS_DISTORTION
   2481      * @see ACAMERA_LENS_POSE_ROTATION
   2482      * @see ACAMERA_LENS_POSE_TRANSLATION
   2483      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   2484      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
   2485      */
   2486     ACAMERA_LENS_INTRINSIC_CALIBRATION =                        // float[5]
   2487             ACAMERA_LENS_START + 10,
   2488     ACAMERA_LENS_RADIAL_DISTORTION =                            // Deprecated! DO NOT USE
   2489             ACAMERA_LENS_START + 11,
   2490     /**
   2491      * <p>The origin for ACAMERA_LENS_POSE_TRANSLATION.</p>
   2492      *
   2493      * @see ACAMERA_LENS_POSE_TRANSLATION
   2494      *
   2495      * <p>Type: byte (acamera_metadata_enum_android_lens_pose_reference_t)</p>
   2496      *
   2497      * <p>This tag may appear in:
   2498      * <ul>
   2499      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2500      * </ul></p>
   2501      *
   2502      * <p>Different calibration methods and use cases can produce better or worse results
   2503      * depending on the selected coordinate origin.</p>
   2504      */
   2505     ACAMERA_LENS_POSE_REFERENCE =                               // byte (acamera_metadata_enum_android_lens_pose_reference_t)
   2506             ACAMERA_LENS_START + 12,
   2507     /**
   2508      * <p>The correction coefficients to correct for this camera device's
   2509      * radial and tangential lens distortion.</p>
   2510      * <p>Replaces the deprecated ACAMERA_LENS_RADIAL_DISTORTION field, which was
   2511      * inconsistently defined.</p>
   2512      *
   2513      * @see ACAMERA_LENS_RADIAL_DISTORTION
   2514      *
   2515      * <p>Type: float[5]</p>
   2516      *
   2517      * <p>This tag may appear in:
   2518      * <ul>
   2519      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2520      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2521      * </ul></p>
   2522      *
   2523      * <p>Three radial distortion coefficients <code>[kappa_1, kappa_2,
   2524      * kappa_3]</code> and two tangential distortion coefficients
   2525      * <code>[kappa_4, kappa_5]</code> that can be used to correct the
   2526      * lens's geometric distortion with the mapping equations:</p>
   2527      * <pre><code> x_c = x_i * ( 1 + kappa_1 * r^2 + kappa_2 * r^4 + kappa_3 * r^6 ) +
   2528      *        kappa_4 * (2 * x_i * y_i) + kappa_5 * ( r^2 + 2 * x_i^2 )
   2529      *  y_c = y_i * ( 1 + kappa_1 * r^2 + kappa_2 * r^4 + kappa_3 * r^6 ) +
   2530      *        kappa_5 * (2 * x_i * y_i) + kappa_4 * ( r^2 + 2 * y_i^2 )
   2531      * </code></pre>
   2532      * <p>Here, <code>[x_c, y_c]</code> are the coordinates to sample in the
   2533      * input image that correspond to the pixel values in the
   2534      * corrected image at the coordinate <code>[x_i, y_i]</code>:</p>
   2535      * <pre><code> correctedImage(x_i, y_i) = sample_at(x_c, y_c, inputImage)
   2536      * </code></pre>
   2537      * <p>The pixel coordinates are defined in a coordinate system
   2538      * related to the ACAMERA_LENS_INTRINSIC_CALIBRATION
   2539      * calibration fields; see that entry for details of the mapping stages.
   2540      * Both <code>[x_i, y_i]</code> and <code>[x_c, y_c]</code>
   2541      * have <code>(0,0)</code> at the lens optical center <code>[c_x, c_y]</code>, and
   2542      * the range of the coordinates depends on the focal length
   2543      * terms of the intrinsic calibration.</p>
   2544      * <p>Finally, <code>r</code> represents the radial distance from the
   2545      * optical center, <code>r^2 = x_i^2 + y_i^2</code>.</p>
   2546      * <p>The distortion model used is the Brown-Conrady model.</p>
   2547      *
   2548      * @see ACAMERA_LENS_INTRINSIC_CALIBRATION
   2549      */
   2550     ACAMERA_LENS_DISTORTION =                                   // float[5]
   2551             ACAMERA_LENS_START + 13,
   2552     ACAMERA_LENS_END,
   2553 
   2554     /**
   2555      * <p>List of aperture size values for ACAMERA_LENS_APERTURE that are
   2556      * supported by this camera device.</p>
   2557      *
   2558      * @see ACAMERA_LENS_APERTURE
   2559      *
   2560      * <p>Type: float[n]</p>
   2561      *
   2562      * <p>This tag may appear in:
   2563      * <ul>
   2564      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2565      * </ul></p>
   2566      *
   2567      * <p>If the camera device doesn't support a variable lens aperture,
   2568      * this list will contain only one value, which is the fixed aperture size.</p>
   2569      * <p>If the camera device supports a variable aperture, the aperture values
   2570      * in this list will be sorted in ascending order.</p>
   2571      */
   2572     ACAMERA_LENS_INFO_AVAILABLE_APERTURES =                     // float[n]
   2573             ACAMERA_LENS_INFO_START,
   2574     /**
   2575      * <p>List of neutral density filter values for
   2576      * ACAMERA_LENS_FILTER_DENSITY that are supported by this camera device.</p>
   2577      *
   2578      * @see ACAMERA_LENS_FILTER_DENSITY
   2579      *
   2580      * <p>Type: float[n]</p>
   2581      *
   2582      * <p>This tag may appear in:
   2583      * <ul>
   2584      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2585      * </ul></p>
   2586      *
   2587      * <p>If a neutral density filter is not supported by this camera device,
   2588      * this list will contain only 0. Otherwise, this list will include every
   2589      * filter density supported by the camera device, in ascending order.</p>
   2590      */
   2591     ACAMERA_LENS_INFO_AVAILABLE_FILTER_DENSITIES =              // float[n]
   2592             ACAMERA_LENS_INFO_START + 1,
   2593     /**
   2594      * <p>List of focal lengths for ACAMERA_LENS_FOCAL_LENGTH that are supported by this camera
   2595      * device.</p>
   2596      *
   2597      * @see ACAMERA_LENS_FOCAL_LENGTH
   2598      *
   2599      * <p>Type: float[n]</p>
   2600      *
   2601      * <p>This tag may appear in:
   2602      * <ul>
   2603      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2604      * </ul></p>
   2605      *
   2606      * <p>If optical zoom is not supported, this list will only contain
   2607      * a single value corresponding to the fixed focal length of the
   2608      * device. Otherwise, this list will include every focal length supported
   2609      * by the camera device, in ascending order.</p>
   2610      */
   2611     ACAMERA_LENS_INFO_AVAILABLE_FOCAL_LENGTHS =                 // float[n]
   2612             ACAMERA_LENS_INFO_START + 2,
   2613     /**
   2614      * <p>List of optical image stabilization (OIS) modes for
   2615      * ACAMERA_LENS_OPTICAL_STABILIZATION_MODE that are supported by this camera device.</p>
   2616      *
   2617      * @see ACAMERA_LENS_OPTICAL_STABILIZATION_MODE
   2618      *
   2619      * <p>Type: byte[n]</p>
   2620      *
   2621      * <p>This tag may appear in:
   2622      * <ul>
   2623      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2624      * </ul></p>
   2625      *
   2626      * <p>If OIS is not supported by a given camera device, this list will
   2627      * contain only OFF.</p>
   2628      */
   2629     ACAMERA_LENS_INFO_AVAILABLE_OPTICAL_STABILIZATION =         // byte[n]
   2630             ACAMERA_LENS_INFO_START + 3,
   2631     /**
   2632      * <p>Hyperfocal distance for this lens.</p>
   2633      *
   2634      * <p>Type: float</p>
   2635      *
   2636      * <p>This tag may appear in:
   2637      * <ul>
   2638      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2639      * </ul></p>
   2640      *
   2641      * <p>If the lens is not fixed focus, the camera device will report this
   2642      * field when ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION is APPROXIMATE or CALIBRATED.</p>
   2643      *
   2644      * @see ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION
   2645      */
   2646     ACAMERA_LENS_INFO_HYPERFOCAL_DISTANCE =                     // float
   2647             ACAMERA_LENS_INFO_START + 4,
   2648     /**
   2649      * <p>Shortest distance from frontmost surface
   2650      * of the lens that can be brought into sharp focus.</p>
   2651      *
   2652      * <p>Type: float</p>
   2653      *
   2654      * <p>This tag may appear in:
   2655      * <ul>
   2656      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2657      * </ul></p>
   2658      *
   2659      * <p>If the lens is fixed-focus, this will be
   2660      * 0.</p>
   2661      */
   2662     ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE =                  // float
   2663             ACAMERA_LENS_INFO_START + 5,
   2664     /**
   2665      * <p>Dimensions of lens shading map.</p>
   2666      *
   2667      * <p>Type: int32[2]</p>
   2668      *
   2669      * <p>This tag may appear in:
   2670      * <ul>
   2671      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2672      * </ul></p>
   2673      *
   2674      * <p>The map should be on the order of 30-40 rows and columns, and
   2675      * must be smaller than 64x64.</p>
   2676      */
   2677     ACAMERA_LENS_INFO_SHADING_MAP_SIZE =                        // int32[2]
   2678             ACAMERA_LENS_INFO_START + 6,
   2679     /**
   2680      * <p>The lens focus distance calibration quality.</p>
   2681      *
   2682      * <p>Type: byte (acamera_metadata_enum_android_lens_info_focus_distance_calibration_t)</p>
   2683      *
   2684      * <p>This tag may appear in:
   2685      * <ul>
   2686      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2687      * </ul></p>
   2688      *
   2689      * <p>The lens focus distance calibration quality determines the reliability of
   2690      * focus related metadata entries, i.e. ACAMERA_LENS_FOCUS_DISTANCE,
   2691      * ACAMERA_LENS_FOCUS_RANGE, ACAMERA_LENS_INFO_HYPERFOCAL_DISTANCE, and
   2692      * ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE.</p>
   2693      * <p>APPROXIMATE and CALIBRATED devices report the focus metadata in
   2694      * units of diopters (1/meter), so <code>0.0f</code> represents focusing at infinity,
   2695      * and increasing positive numbers represent focusing closer and closer
   2696      * to the camera device. The focus distance control also uses diopters
   2697      * on these devices.</p>
   2698      * <p>UNCALIBRATED devices do not use units that are directly comparable
   2699      * to any real physical measurement, but <code>0.0f</code> still represents farthest
   2700      * focus, and ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE represents the
   2701      * nearest focus the device can achieve.</p>
   2702      *
   2703      * @see ACAMERA_LENS_FOCUS_DISTANCE
   2704      * @see ACAMERA_LENS_FOCUS_RANGE
   2705      * @see ACAMERA_LENS_INFO_HYPERFOCAL_DISTANCE
   2706      * @see ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE
   2707      */
   2708     ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION =              // byte (acamera_metadata_enum_android_lens_info_focus_distance_calibration_t)
   2709             ACAMERA_LENS_INFO_START + 7,
   2710     ACAMERA_LENS_INFO_END,
   2711 
   2712     /**
   2713      * <p>Mode of operation for the noise reduction algorithm.</p>
   2714      *
   2715      * <p>Type: byte (acamera_metadata_enum_android_noise_reduction_mode_t)</p>
   2716      *
   2717      * <p>This tag may appear in:
   2718      * <ul>
   2719      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2720      *   <li>ACaptureRequest</li>
   2721      * </ul></p>
   2722      *
   2723      * <p>The noise reduction algorithm attempts to improve image quality by removing
   2724      * excessive noise added by the capture process, especially in dark conditions.</p>
   2725      * <p>OFF means no noise reduction will be applied by the camera device, for both raw and
   2726      * YUV domain.</p>
   2727      * <p>MINIMAL means that only sensor raw domain basic noise reduction is enabled ,to remove
   2728      * demosaicing or other processing artifacts. For YUV_REPROCESSING, MINIMAL is same as OFF.
   2729      * This mode is optional, may not be support by all devices. The application should check
   2730      * ACAMERA_NOISE_REDUCTION_AVAILABLE_NOISE_REDUCTION_MODES before using it.</p>
   2731      * <p>FAST/HIGH_QUALITY both mean camera device determined noise filtering
   2732      * will be applied. HIGH_QUALITY mode indicates that the camera device
   2733      * will use the highest-quality noise filtering algorithms,
   2734      * even if it slows down capture rate. FAST means the camera device will not
   2735      * slow down capture rate when applying noise filtering. FAST may be the same as MINIMAL if
   2736      * MINIMAL is listed, or the same as OFF if any noise filtering will slow down capture rate.
   2737      * Every output stream will have a similar amount of enhancement applied.</p>
   2738      * <p>ZERO_SHUTTER_LAG is meant to be used by applications that maintain a continuous circular
   2739      * buffer of high-resolution images during preview and reprocess image(s) from that buffer
   2740      * into a final capture when triggered by the user. In this mode, the camera device applies
   2741      * noise reduction to low-resolution streams (below maximum recording resolution) to maximize
   2742      * preview quality, but does not apply noise reduction to high-resolution streams, since
   2743      * those will be reprocessed later if necessary.</p>
   2744      * <p>For YUV_REPROCESSING, these FAST/HIGH_QUALITY modes both mean that the camera device
   2745      * will apply FAST/HIGH_QUALITY YUV domain noise reduction, respectively. The camera device
   2746      * may adjust the noise reduction parameters for best image quality based on the
   2747      * android.reprocess.effectiveExposureFactor if it is set.</p>
   2748      *
   2749      * @see ACAMERA_NOISE_REDUCTION_AVAILABLE_NOISE_REDUCTION_MODES
   2750      */
   2751     ACAMERA_NOISE_REDUCTION_MODE =                              // byte (acamera_metadata_enum_android_noise_reduction_mode_t)
   2752             ACAMERA_NOISE_REDUCTION_START,
   2753     /**
   2754      * <p>List of noise reduction modes for ACAMERA_NOISE_REDUCTION_MODE that are supported
   2755      * by this camera device.</p>
   2756      *
   2757      * @see ACAMERA_NOISE_REDUCTION_MODE
   2758      *
   2759      * <p>Type: byte[n]</p>
   2760      *
   2761      * <p>This tag may appear in:
   2762      * <ul>
   2763      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2764      * </ul></p>
   2765      *
   2766      * <p>Full-capability camera devices will always support OFF and FAST.</p>
   2767      * <p>Camera devices that support YUV_REPROCESSING or PRIVATE_REPROCESSING will support
   2768      * ZERO_SHUTTER_LAG.</p>
   2769      * <p>Legacy-capability camera devices will only support FAST mode.</p>
   2770      */
   2771     ACAMERA_NOISE_REDUCTION_AVAILABLE_NOISE_REDUCTION_MODES =   // byte[n]
   2772             ACAMERA_NOISE_REDUCTION_START + 2,
   2773     ACAMERA_NOISE_REDUCTION_END,
   2774 
   2775     /**
   2776      * <p>The maximum numbers of different types of output streams
   2777      * that can be configured and used simultaneously by a camera device.</p>
   2778      *
   2779      * <p>Type: int32[3]</p>
   2780      *
   2781      * <p>This tag may appear in:
   2782      * <ul>
   2783      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2784      * </ul></p>
   2785      *
   2786      * <p>This is a 3 element tuple that contains the max number of output simultaneous
   2787      * streams for raw sensor, processed (but not stalling), and processed (and stalling)
   2788      * formats respectively. For example, assuming that JPEG is typically a processed and
   2789      * stalling stream, if max raw sensor format output stream number is 1, max YUV streams
   2790      * number is 3, and max JPEG stream number is 2, then this tuple should be <code>(1, 3, 2)</code>.</p>
   2791      * <p>This lists the upper bound of the number of output streams supported by
   2792      * the camera device. Using more streams simultaneously may require more hardware and
   2793      * CPU resources that will consume more power. The image format for an output stream can
   2794      * be any supported format provided by ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS.
   2795      * The formats defined in ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS can be catergorized
   2796      * into the 3 stream types as below:</p>
   2797      * <ul>
   2798      * <li>Processed (but stalling): any non-RAW format with a stallDurations &gt; 0.
   2799      *   Typically {@link AIMAGE_FORMAT_JPEG JPEG format}.</li>
   2800      * <li>Raw formats: {@link AIMAGE_FORMAT_RAW16 RAW_SENSOR}, {@link AIMAGE_FORMAT_RAW10 RAW10}, or
   2801      *   {@link AIMAGE_FORMAT_RAW12 RAW12}.</li>
   2802      * <li>Processed (but not-stalling): any non-RAW format without a stall duration.  Typically
   2803      *   {@link AIMAGE_FORMAT_YUV_420_888 YUV_420_888},
   2804      *   <a href="https://developer.android.com/reference/android/graphics/ImageFormat.html#NV21">NV21</a>, <a href="https://developer.android.com/reference/android/graphics/ImageFormat.html#YV12">YV12</a>, or {@link AIMAGE_FORMAT_Y8 Y8} .</li>
   2805      * </ul>
   2806      *
   2807      * @see ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS
   2808      */
   2809     ACAMERA_REQUEST_MAX_NUM_OUTPUT_STREAMS =                    // int32[3]
   2810             ACAMERA_REQUEST_START + 6,
   2811     /**
   2812      * <p>Specifies the number of pipeline stages the frame went
   2813      * through from when it was exposed to when the final completed result
   2814      * was available to the framework.</p>
   2815      *
   2816      * <p>Type: byte</p>
   2817      *
   2818      * <p>This tag may appear in:
   2819      * <ul>
   2820      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   2821      * </ul></p>
   2822      *
   2823      * <p>Depending on what settings are used in the request, and
   2824      * what streams are configured, the data may undergo less processing,
   2825      * and some pipeline stages skipped.</p>
   2826      * <p>See ACAMERA_REQUEST_PIPELINE_MAX_DEPTH for more details.</p>
   2827      *
   2828      * @see ACAMERA_REQUEST_PIPELINE_MAX_DEPTH
   2829      */
   2830     ACAMERA_REQUEST_PIPELINE_DEPTH =                            // byte
   2831             ACAMERA_REQUEST_START + 9,
   2832     /**
   2833      * <p>Specifies the number of maximum pipeline stages a frame
   2834      * has to go through from when it's exposed to when it's available
   2835      * to the framework.</p>
   2836      *
   2837      * <p>Type: byte</p>
   2838      *
   2839      * <p>This tag may appear in:
   2840      * <ul>
   2841      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2842      * </ul></p>
   2843      *
   2844      * <p>A typical minimum value for this is 2 (one stage to expose,
   2845      * one stage to readout) from the sensor. The ISP then usually adds
   2846      * its own stages to do custom HW processing. Further stages may be
   2847      * added by SW processing.</p>
   2848      * <p>Depending on what settings are used (e.g. YUV, JPEG) and what
   2849      * processing is enabled (e.g. face detection), the actual pipeline
   2850      * depth (specified by ACAMERA_REQUEST_PIPELINE_DEPTH) may be less than
   2851      * the max pipeline depth.</p>
   2852      * <p>A pipeline depth of X stages is equivalent to a pipeline latency of
   2853      * X frame intervals.</p>
   2854      * <p>This value will normally be 8 or less, however, for high speed capture session,
   2855      * the max pipeline depth will be up to 8 x size of high speed capture request list.</p>
   2856      *
   2857      * @see ACAMERA_REQUEST_PIPELINE_DEPTH
   2858      */
   2859     ACAMERA_REQUEST_PIPELINE_MAX_DEPTH =                        // byte
   2860             ACAMERA_REQUEST_START + 10,
   2861     /**
   2862      * <p>Defines how many sub-components
   2863      * a result will be composed of.</p>
   2864      *
   2865      * <p>Type: int32</p>
   2866      *
   2867      * <p>This tag may appear in:
   2868      * <ul>
   2869      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2870      * </ul></p>
   2871      *
   2872      * <p>In order to combat the pipeline latency, partial results
   2873      * may be delivered to the application layer from the camera device as
   2874      * soon as they are available.</p>
   2875      * <p>Optional; defaults to 1. A value of 1 means that partial
   2876      * results are not supported, and only the final TotalCaptureResult will
   2877      * be produced by the camera device.</p>
   2878      * <p>A typical use case for this might be: after requesting an
   2879      * auto-focus (AF) lock the new AF state might be available 50%
   2880      * of the way through the pipeline.  The camera device could
   2881      * then immediately dispatch this state via a partial result to
   2882      * the application, and the rest of the metadata via later
   2883      * partial results.</p>
   2884      */
   2885     ACAMERA_REQUEST_PARTIAL_RESULT_COUNT =                      // int32
   2886             ACAMERA_REQUEST_START + 11,
   2887     /**
   2888      * <p>List of capabilities that this camera device
   2889      * advertises as fully supporting.</p>
   2890      *
   2891      * <p>Type: byte[n] (acamera_metadata_enum_android_request_available_capabilities_t)</p>
   2892      *
   2893      * <p>This tag may appear in:
   2894      * <ul>
   2895      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2896      * </ul></p>
   2897      *
   2898      * <p>A capability is a contract that the camera device makes in order
   2899      * to be able to satisfy one or more use cases.</p>
   2900      * <p>Listing a capability guarantees that the whole set of features
   2901      * required to support a common use will all be available.</p>
   2902      * <p>Using a subset of the functionality provided by an unsupported
   2903      * capability may be possible on a specific camera device implementation;
   2904      * to do this query each of ACAMERA_REQUEST_AVAILABLE_REQUEST_KEYS,
   2905      * ACAMERA_REQUEST_AVAILABLE_RESULT_KEYS,
   2906      * ACAMERA_REQUEST_AVAILABLE_CHARACTERISTICS_KEYS.</p>
   2907      * <p>The following capabilities are guaranteed to be available on
   2908      * ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL <code>==</code> FULL devices:</p>
   2909      * <ul>
   2910      * <li>MANUAL_SENSOR</li>
   2911      * <li>MANUAL_POST_PROCESSING</li>
   2912      * </ul>
   2913      * <p>Other capabilities may be available on either FULL or LIMITED
   2914      * devices, but the application should query this key to be sure.</p>
   2915      *
   2916      * @see ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL
   2917      * @see ACAMERA_REQUEST_AVAILABLE_CHARACTERISTICS_KEYS
   2918      * @see ACAMERA_REQUEST_AVAILABLE_REQUEST_KEYS
   2919      * @see ACAMERA_REQUEST_AVAILABLE_RESULT_KEYS
   2920      */
   2921     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES =                    // byte[n] (acamera_metadata_enum_android_request_available_capabilities_t)
   2922             ACAMERA_REQUEST_START + 12,
   2923     /**
   2924      * <p>A list of all keys that the camera device has available
   2925      * to use with {@link ACaptureRequest }.</p>
   2926      *
   2927      * <p>Type: int32[n]</p>
   2928      *
   2929      * <p>This tag may appear in:
   2930      * <ul>
   2931      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2932      * </ul></p>
   2933      *
   2934      * <p>Attempting to set a key into a CaptureRequest that is not
   2935      * listed here will result in an invalid request and will be rejected
   2936      * by the camera device.</p>
   2937      * <p>This field can be used to query the feature set of a camera device
   2938      * at a more granular level than capabilities. This is especially
   2939      * important for optional keys that are not listed under any capability
   2940      * in ACAMERA_REQUEST_AVAILABLE_CAPABILITIES.</p>
   2941      *
   2942      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   2943      */
   2944     ACAMERA_REQUEST_AVAILABLE_REQUEST_KEYS =                    // int32[n]
   2945             ACAMERA_REQUEST_START + 13,
   2946     /**
   2947      * <p>A list of all keys that the camera device has available to use with {@link ACameraCaptureSession_captureCallback_result }.</p>
   2948      *
   2949      * <p>Type: int32[n]</p>
   2950      *
   2951      * <p>This tag may appear in:
   2952      * <ul>
   2953      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2954      * </ul></p>
   2955      *
   2956      * <p>Attempting to get a key from a CaptureResult that is not
   2957      * listed here will always return a <code>null</code> value. Getting a key from
   2958      * a CaptureResult that is listed here will generally never return a <code>null</code>
   2959      * value.</p>
   2960      * <p>The following keys may return <code>null</code> unless they are enabled:</p>
   2961      * <ul>
   2962      * <li>ACAMERA_STATISTICS_LENS_SHADING_MAP (non-null iff ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE == ON)</li>
   2963      * </ul>
   2964      * <p>(Those sometimes-null keys will nevertheless be listed here
   2965      * if they are available.)</p>
   2966      * <p>This field can be used to query the feature set of a camera device
   2967      * at a more granular level than capabilities. This is especially
   2968      * important for optional keys that are not listed under any capability
   2969      * in ACAMERA_REQUEST_AVAILABLE_CAPABILITIES.</p>
   2970      *
   2971      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   2972      * @see ACAMERA_STATISTICS_LENS_SHADING_MAP
   2973      * @see ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE
   2974      */
   2975     ACAMERA_REQUEST_AVAILABLE_RESULT_KEYS =                     // int32[n]
   2976             ACAMERA_REQUEST_START + 14,
   2977     /**
   2978      * <p>A list of all keys that the camera device has available to use with {@link ACameraManager_getCameraCharacteristics }.</p>
   2979      *
   2980      * <p>Type: int32[n]</p>
   2981      *
   2982      * <p>This tag may appear in:
   2983      * <ul>
   2984      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   2985      * </ul></p>
   2986      *
   2987      * <p>This entry follows the same rules as
   2988      * ACAMERA_REQUEST_AVAILABLE_RESULT_KEYS (except that it applies for
   2989      * CameraCharacteristics instead of CaptureResult). See above for more
   2990      * details.</p>
   2991      *
   2992      * @see ACAMERA_REQUEST_AVAILABLE_RESULT_KEYS
   2993      */
   2994     ACAMERA_REQUEST_AVAILABLE_CHARACTERISTICS_KEYS =            // int32[n]
   2995             ACAMERA_REQUEST_START + 15,
   2996     /**
   2997      * <p>A subset of the available request keys that the camera device
   2998      * can pass as part of the capture session initialization.</p>
   2999      *
   3000      * <p>Type: int32[n]</p>
   3001      *
   3002      * <p>This tag may appear in:
   3003      * <ul>
   3004      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3005      * </ul></p>
   3006      *
   3007      * <p>This is a subset of ACAMERA_REQUEST_AVAILABLE_REQUEST_KEYS which
   3008      * contains a list of keys that are difficult to apply per-frame and
   3009      * can result in unexpected delays when modified during the capture session
   3010      * lifetime. Typical examples include parameters that require a
   3011      * time-consuming hardware re-configuration or internal camera pipeline
   3012      * change. For performance reasons we advise clients to pass their initial
   3013      * values as part of
   3014      * {@link ACameraDevice_createCaptureSessionWithSessionParameters }.
   3015      * Once the camera capture session is enabled it is also recommended to avoid
   3016      * changing them from their initial values set in
   3017      * {@link ACameraDevice_createCaptureSessionWithSessionParameters }.
   3018      * Control over session parameters can still be exerted in capture requests
   3019      * but clients should be aware and expect delays during their application.
   3020      * An example usage scenario could look like this:</p>
   3021      * <ul>
   3022      * <li>The camera client starts by quering the session parameter key list via
   3023      *   {@link ACameraManager_getCameraCharacteristics }.</li>
   3024      * <li>Before triggering the capture session create sequence, a capture request
   3025      *   must be built via
   3026      *   {@link ACameraDevice_createCaptureRequest }
   3027      *   using an appropriate template matching the particular use case.</li>
   3028      * <li>The client should go over the list of session parameters and check
   3029      *   whether some of the keys listed matches with the parameters that
   3030      *   they intend to modify as part of the first capture request.</li>
   3031      * <li>If there is no such match, the capture request can be  passed
   3032      *   unmodified to
   3033      *   {@link ACameraDevice_createCaptureSessionWithSessionParameters }.</li>
   3034      * <li>If matches do exist, the client should update the respective values
   3035      *   and pass the request to
   3036      *   {@link ACameraDevice_createCaptureSessionWithSessionParameters }.</li>
   3037      * <li>After the capture session initialization completes the session parameter
   3038      *   key list can continue to serve as reference when posting or updating
   3039      *   further requests. As mentioned above further changes to session
   3040      *   parameters should ideally be avoided, if updates are necessary
   3041      *   however clients could expect a delay/glitch during the
   3042      *   parameter switch.</li>
   3043      * </ul>
   3044      *
   3045      * @see ACAMERA_REQUEST_AVAILABLE_REQUEST_KEYS
   3046      */
   3047     ACAMERA_REQUEST_AVAILABLE_SESSION_KEYS =                    // int32[n]
   3048             ACAMERA_REQUEST_START + 16,
   3049     /**
   3050      * <p>A subset of the available request keys that can be overridden for
   3051      * physical devices backing a logical multi-camera.</p>
   3052      *
   3053      * <p>Type: int32[n]</p>
   3054      *
   3055      * <p>This tag may appear in:
   3056      * <ul>
   3057      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3058      * </ul></p>
   3059      *
   3060      * <p>This is a subset of ACAMERA_REQUEST_AVAILABLE_REQUEST_KEYS which contains a list
   3061      * of keys that can be overridden using <a href="https://developer.android.com/reference/CaptureRequest/Builder.html#setPhysicalCameraKey">Builder#setPhysicalCameraKey</a>.
   3062      * The respective value of such request key can be obtained by calling
   3063      * <a href="https://developer.android.com/reference/CaptureRequest/Builder.html#getPhysicalCameraKey">Builder#getPhysicalCameraKey</a>. Capture requests that contain
   3064      * individual physical device requests must be built via
   3065      * <a href="https://developer.android.com/reference/android/hardware/camera2/CameraDevice.html#createCaptureRequest(int,">Set)</a>.</p>
   3066      *
   3067      * @see ACAMERA_REQUEST_AVAILABLE_REQUEST_KEYS
   3068      */
   3069     ACAMERA_REQUEST_AVAILABLE_PHYSICAL_CAMERA_REQUEST_KEYS =    // int32[n]
   3070             ACAMERA_REQUEST_START + 17,
   3071     ACAMERA_REQUEST_END,
   3072 
   3073     /**
   3074      * <p>The desired region of the sensor to read out for this capture.</p>
   3075      *
   3076      * <p>Type: int32[4]</p>
   3077      *
   3078      * <p>This tag may appear in:
   3079      * <ul>
   3080      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   3081      *   <li>ACaptureRequest</li>
   3082      * </ul></p>
   3083      *
   3084      * <p>This control can be used to implement digital zoom.</p>
   3085      * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
   3086      * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with <code>(0, 0)</code> being
   3087      * the top-left pixel of the active array.</p>
   3088      * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
   3089      * system depends on the mode being set.
   3090      * When the distortion correction mode is OFF, the coordinate system follows
   3091      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
   3092      * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array.
   3093      * When the distortion correction mode is not OFF, the coordinate system follows
   3094      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
   3095      * <code>(0, 0)</code> being the top-left pixel of the active array.</p>
   3096      * <p>Output streams use this rectangle to produce their output,
   3097      * cropping to a smaller region if necessary to maintain the
   3098      * stream's aspect ratio, then scaling the sensor input to
   3099      * match the output's configured resolution.</p>
   3100      * <p>The crop region is applied after the RAW to other color
   3101      * space (e.g. YUV) conversion. Since raw streams
   3102      * (e.g. RAW16) don't have the conversion stage, they are not
   3103      * croppable. The crop region will be ignored by raw streams.</p>
   3104      * <p>For non-raw streams, any additional per-stream cropping will
   3105      * be done to maximize the final pixel area of the stream.</p>
   3106      * <p>For example, if the crop region is set to a 4:3 aspect
   3107      * ratio, then 4:3 streams will use the exact crop
   3108      * region. 16:9 streams will further crop vertically
   3109      * (letterbox).</p>
   3110      * <p>Conversely, if the crop region is set to a 16:9, then 4:3
   3111      * outputs will crop horizontally (pillarbox), and 16:9
   3112      * streams will match exactly. These additional crops will
   3113      * be centered within the crop region.</p>
   3114      * <p>If the coordinate system is ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, the width and height
   3115      * of the crop region cannot be set to be smaller than
   3116      * <code>floor( activeArraySize.width / ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM )</code> and
   3117      * <code>floor( activeArraySize.height / ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM )</code>, respectively.</p>
   3118      * <p>If the coordinate system is ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, the width
   3119      * and height of the crop region cannot be set to be smaller than
   3120      * <code>floor( preCorrectionActiveArraySize.width / ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM )</code>
   3121      * and
   3122      * <code>floor( preCorrectionActiveArraySize.height / ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM )</code>,
   3123      * respectively.</p>
   3124      * <p>The camera device may adjust the crop region to account
   3125      * for rounding and other hardware requirements; the final
   3126      * crop region used will be included in the output capture
   3127      * result.</p>
   3128      * <p>The data representation is int[4], which maps to (left, top, width, height).</p>
   3129      *
   3130      * @see ACAMERA_DISTORTION_CORRECTION_MODE
   3131      * @see ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM
   3132      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   3133      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
   3134      */
   3135     ACAMERA_SCALER_CROP_REGION =                                // int32[4]
   3136             ACAMERA_SCALER_START,
   3137     /**
   3138      * <p>The maximum ratio between both active area width
   3139      * and crop region width, and active area height and
   3140      * crop region height, for ACAMERA_SCALER_CROP_REGION.</p>
   3141      *
   3142      * @see ACAMERA_SCALER_CROP_REGION
   3143      *
   3144      * <p>Type: float</p>
   3145      *
   3146      * <p>This tag may appear in:
   3147      * <ul>
   3148      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3149      * </ul></p>
   3150      *
   3151      * <p>This represents the maximum amount of zooming possible by
   3152      * the camera device, or equivalently, the minimum cropping
   3153      * window size.</p>
   3154      * <p>Crop regions that have a width or height that is smaller
   3155      * than this ratio allows will be rounded up to the minimum
   3156      * allowed size by the camera device.</p>
   3157      */
   3158     ACAMERA_SCALER_AVAILABLE_MAX_DIGITAL_ZOOM =                 // float
   3159             ACAMERA_SCALER_START + 4,
   3160     /**
   3161      * <p>The available stream configurations that this
   3162      * camera device supports
   3163      * (i.e. format, width, height, output/input stream).</p>
   3164      *
   3165      * <p>Type: int32[n*4] (acamera_metadata_enum_android_scaler_available_stream_configurations_t)</p>
   3166      *
   3167      * <p>This tag may appear in:
   3168      * <ul>
   3169      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3170      * </ul></p>
   3171      *
   3172      * <p>The configurations are listed as <code>(format, width, height, input?)</code>
   3173      * tuples.</p>
   3174      * <p>For a given use case, the actual maximum supported resolution
   3175      * may be lower than what is listed here, depending on the destination
   3176      * Surface for the image data. For example, for recording video,
   3177      * the video encoder chosen may have a maximum size limit (e.g. 1080p)
   3178      * smaller than what the camera (e.g. maximum resolution is 3264x2448)
   3179      * can provide.</p>
   3180      * <p>Please reference the documentation for the image data destination to
   3181      * check if it limits the maximum size for image data.</p>
   3182      * <p>Not all output formats may be supported in a configuration with
   3183      * an input stream of a particular format. For more details, see
   3184      * android.scaler.availableInputOutputFormatsMap.</p>
   3185      * <p>The following table describes the minimum required output stream
   3186      * configurations based on the hardware level
   3187      * (ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL):</p>
   3188      * <p>Format         | Size                                         | Hardware Level | Notes
   3189      * :-------------:|:--------------------------------------------:|:--------------:|:--------------:
   3190      * JPEG           | ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE          | Any            |
   3191      * JPEG           | 1920x1080 (1080p)                            | Any            | if 1080p &lt;= activeArraySize
   3192      * JPEG           | 1280x720 (720)                               | Any            | if 720p &lt;= activeArraySize
   3193      * JPEG           | 640x480 (480p)                               | Any            | if 480p &lt;= activeArraySize
   3194      * JPEG           | 320x240 (240p)                               | Any            | if 240p &lt;= activeArraySize
   3195      * YUV_420_888    | all output sizes available for JPEG          | FULL           |
   3196      * YUV_420_888    | all output sizes available for JPEG, up to the maximum video size | LIMITED        |
   3197      * IMPLEMENTATION_DEFINED | same as YUV_420_888                  | Any            |</p>
   3198      * <p>Refer to ACAMERA_REQUEST_AVAILABLE_CAPABILITIES for additional
   3199      * mandatory stream configurations on a per-capability basis.</p>
   3200      * <p>Exception on 176x144 (QCIF) resolution: camera devices usually have a fixed capability for
   3201      * downscaling from larger resolution to smaller, and the QCIF resolution sometimes is not
   3202      * fully supported due to this limitation on devices with high-resolution image sensors.
   3203      * Therefore, trying to configure a QCIF resolution stream together with any other
   3204      * stream larger than 1920x1080 resolution (either width or height) might not be supported,
   3205      * and capture session creation will fail if it is not.</p>
   3206      *
   3207      * @see ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL
   3208      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   3209      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   3210      */
   3211     ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS =            // int32[n*4] (acamera_metadata_enum_android_scaler_available_stream_configurations_t)
   3212             ACAMERA_SCALER_START + 10,
   3213     /**
   3214      * <p>This lists the minimum frame duration for each
   3215      * format/size combination.</p>
   3216      *
   3217      * <p>Type: int64[4*n]</p>
   3218      *
   3219      * <p>This tag may appear in:
   3220      * <ul>
   3221      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3222      * </ul></p>
   3223      *
   3224      * <p>This should correspond to the frame duration when only that
   3225      * stream is active, with all processing (typically in android.*.mode)
   3226      * set to either OFF or FAST.</p>
   3227      * <p>When multiple streams are used in a request, the minimum frame
   3228      * duration will be max(individual stream min durations).</p>
   3229      * <p>The minimum frame duration of a stream (of a particular format, size)
   3230      * is the same regardless of whether the stream is input or output.</p>
   3231      * <p>See ACAMERA_SENSOR_FRAME_DURATION and
   3232      * ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS for more details about
   3233      * calculating the max frame rate.</p>
   3234      *
   3235      * @see ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS
   3236      * @see ACAMERA_SENSOR_FRAME_DURATION
   3237      */
   3238     ACAMERA_SCALER_AVAILABLE_MIN_FRAME_DURATIONS =              // int64[4*n]
   3239             ACAMERA_SCALER_START + 11,
   3240     /**
   3241      * <p>This lists the maximum stall duration for each
   3242      * output format/size combination.</p>
   3243      *
   3244      * <p>Type: int64[4*n]</p>
   3245      *
   3246      * <p>This tag may appear in:
   3247      * <ul>
   3248      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3249      * </ul></p>
   3250      *
   3251      * <p>A stall duration is how much extra time would get added
   3252      * to the normal minimum frame duration for a repeating request
   3253      * that has streams with non-zero stall.</p>
   3254      * <p>For example, consider JPEG captures which have the following
   3255      * characteristics:</p>
   3256      * <ul>
   3257      * <li>JPEG streams act like processed YUV streams in requests for which
   3258      * they are not included; in requests in which they are directly
   3259      * referenced, they act as JPEG streams. This is because supporting a
   3260      * JPEG stream requires the underlying YUV data to always be ready for
   3261      * use by a JPEG encoder, but the encoder will only be used (and impact
   3262      * frame duration) on requests that actually reference a JPEG stream.</li>
   3263      * <li>The JPEG processor can run concurrently to the rest of the camera
   3264      * pipeline, but cannot process more than 1 capture at a time.</li>
   3265      * </ul>
   3266      * <p>In other words, using a repeating YUV request would result
   3267      * in a steady frame rate (let's say it's 30 FPS). If a single
   3268      * JPEG request is submitted periodically, the frame rate will stay
   3269      * at 30 FPS (as long as we wait for the previous JPEG to return each
   3270      * time). If we try to submit a repeating YUV + JPEG request, then
   3271      * the frame rate will drop from 30 FPS.</p>
   3272      * <p>In general, submitting a new request with a non-0 stall time
   3273      * stream will <em>not</em> cause a frame rate drop unless there are still
   3274      * outstanding buffers for that stream from previous requests.</p>
   3275      * <p>Submitting a repeating request with streams (call this <code>S</code>)
   3276      * is the same as setting the minimum frame duration from
   3277      * the normal minimum frame duration corresponding to <code>S</code>, added with
   3278      * the maximum stall duration for <code>S</code>.</p>
   3279      * <p>If interleaving requests with and without a stall duration,
   3280      * a request will stall by the maximum of the remaining times
   3281      * for each can-stall stream with outstanding buffers.</p>
   3282      * <p>This means that a stalling request will not have an exposure start
   3283      * until the stall has completed.</p>
   3284      * <p>This should correspond to the stall duration when only that stream is
   3285      * active, with all processing (typically in android.*.mode) set to FAST
   3286      * or OFF. Setting any of the processing modes to HIGH_QUALITY
   3287      * effectively results in an indeterminate stall duration for all
   3288      * streams in a request (the regular stall calculation rules are
   3289      * ignored).</p>
   3290      * <p>The following formats may always have a stall duration:</p>
   3291      * <ul>
   3292      * <li>{@link AIMAGE_FORMAT_JPEG }</li>
   3293      * <li>{@link AIMAGE_FORMAT_RAW16 }</li>
   3294      * </ul>
   3295      * <p>The following formats will never have a stall duration:</p>
   3296      * <ul>
   3297      * <li>{@link AIMAGE_FORMAT_YUV_420_888 }</li>
   3298      * <li>{@link AIMAGE_FORMAT_RAW10 }</li>
   3299      * <li>{@link AIMAGE_FORMAT_RAW12 }</li>
   3300      * <li>{@link AIMAGE_FORMAT_Y8 }</li>
   3301      * </ul>
   3302      * <p>All other formats may or may not have an allowed stall duration on
   3303      * a per-capability basis; refer to ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   3304      * for more details.</p>
   3305      * <p>See ACAMERA_SENSOR_FRAME_DURATION for more information about
   3306      * calculating the max frame rate (absent stalls).</p>
   3307      *
   3308      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   3309      * @see ACAMERA_SENSOR_FRAME_DURATION
   3310      */
   3311     ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS =                  // int64[4*n]
   3312             ACAMERA_SCALER_START + 12,
   3313     /**
   3314      * <p>The crop type that this camera device supports.</p>
   3315      *
   3316      * <p>Type: byte (acamera_metadata_enum_android_scaler_cropping_type_t)</p>
   3317      *
   3318      * <p>This tag may appear in:
   3319      * <ul>
   3320      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3321      * </ul></p>
   3322      *
   3323      * <p>When passing a non-centered crop region (ACAMERA_SCALER_CROP_REGION) to a camera
   3324      * device that only supports CENTER_ONLY cropping, the camera device will move the
   3325      * crop region to the center of the sensor active array (ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE)
   3326      * and keep the crop region width and height unchanged. The camera device will return the
   3327      * final used crop region in metadata result ACAMERA_SCALER_CROP_REGION.</p>
   3328      * <p>Camera devices that support FREEFORM cropping will support any crop region that
   3329      * is inside of the active array. The camera device will apply the same crop region and
   3330      * return the final used crop region in capture result metadata ACAMERA_SCALER_CROP_REGION.</p>
   3331      * <p>LEGACY capability devices will only support CENTER_ONLY cropping.</p>
   3332      *
   3333      * @see ACAMERA_SCALER_CROP_REGION
   3334      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   3335      */
   3336     ACAMERA_SCALER_CROPPING_TYPE =                              // byte (acamera_metadata_enum_android_scaler_cropping_type_t)
   3337             ACAMERA_SCALER_START + 13,
   3338     /**
   3339      * <p>Recommended stream configurations for common client use cases.</p>
   3340      *
   3341      * <p>Type: int32[n*5] (acamera_metadata_enum_android_scaler_available_recommended_stream_configurations_t)</p>
   3342      *
   3343      * <p>This tag may appear in:
   3344      * <ul>
   3345      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3346      * </ul></p>
   3347      *
   3348      * <p>Optional subset of the ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS that contains
   3349      * similar tuples listed as
   3350      * (i.e. width, height, format, output/input stream, usecase bit field).
   3351      * Camera devices will be able to suggest particular stream configurations which are
   3352      * power and performance efficient for specific use cases. For more information about
   3353      * retrieving the suggestions see
   3354      * <a href="https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html#getRecommendedStreamConfigurationMap">CameraCharacteristics#getRecommendedStreamConfigurationMap</a>.</p>
   3355      * <p>The data representation is int[5], which maps to
   3356      * (width, height, format, output/input stream, usecase bit field). The array can be
   3357      * parsed using the following pseudo code:</p>
   3358      * <p>struct StreamConfiguration {
   3359      * int32_t format;
   3360      * int32_t width;
   3361      * int32_t height;
   3362      * int32_t isInput; };</p>
   3363      * <p>void getPreferredStreamConfigurations(
   3364      *     int32_t *array, size_t count, int32_t usecaseId,
   3365      *     Vector &lt; StreamConfiguration &gt; * scs) {
   3366      *     const size_t STREAM_CONFIGURATION_SIZE = 5;
   3367      *     const size_t STREAM_WIDTH_OFFSET = 0;
   3368      *     const size_t STREAM_HEIGHT_OFFSET = 1;
   3369      *     const size_t STREAM_FORMAT_OFFSET = 2;
   3370      *     const size_t STREAM_IS_INPUT_OFFSET = 3;
   3371      *     const size_t STREAM_USECASE_BITMAP_OFFSET = 4;</p>
   3372      * <pre><code>for (size_t i = 0; i &lt; count; i+= STREAM_CONFIGURATION_SIZE) {
   3373      *     int32_t width = array[i + STREAM_WIDTH_OFFSET];
   3374      *     int32_t height = array[i + STREAM_HEIGHT_OFFSET];
   3375      *     int32_t format = array[i + STREAM_FORMAT_OFFSET];
   3376      *     int32_t isInput = array[i + STREAM_IS_INPUT_OFFSET];
   3377      *     int32_t supportedUsecases = array[i + STREAM_USECASE_BITMAP_OFFSET];
   3378      *     if (supportedUsecases &amp; (1 &lt;&lt; usecaseId)) {
   3379      *         StreamConfiguration sc = {format, width, height, isInput};
   3380      *         scs-&gt;add(sc);
   3381      *     }
   3382      * }
   3383      * </code></pre>
   3384      * <p>}</p>
   3385      *
   3386      * @see ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS
   3387      */
   3388     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS =
   3389                                                                 // int32[n*5] (acamera_metadata_enum_android_scaler_available_recommended_stream_configurations_t)
   3390             ACAMERA_SCALER_START + 14,
   3391     /**
   3392      * <p>Recommended mappings of image formats that are supported by this
   3393      * camera device for input streams, to their corresponding output formats.</p>
   3394      *
   3395      * <p>Type: int32</p>
   3396      *
   3397      * <p>This tag may appear in:
   3398      * <ul>
   3399      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3400      * </ul></p>
   3401      *
   3402      * <p>This is a recommended subset of the complete list of mappings found in
   3403      * android.scaler.availableInputOutputFormatsMap. The same requirements apply here as well.
   3404      * The list however doesn't need to contain all available and supported mappings. Instead of
   3405      * this developers must list only recommended and efficient entries.
   3406      * If set, the information will be available in the ZERO_SHUTTER_LAG recommended stream
   3407      * configuration see
   3408      * <a href="https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html#getRecommendedStreamConfigurationMap">CameraCharacteristics#getRecommendedStreamConfigurationMap</a>.</p>
   3409      */
   3410     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_INPUT_OUTPUT_FORMATS_MAP =
   3411                                                                 // int32
   3412             ACAMERA_SCALER_START + 15,
   3413     ACAMERA_SCALER_END,
   3414 
   3415     /**
   3416      * <p>Duration each pixel is exposed to
   3417      * light.</p>
   3418      *
   3419      * <p>Type: int64</p>
   3420      *
   3421      * <p>This tag may appear in:
   3422      * <ul>
   3423      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   3424      *   <li>ACaptureRequest</li>
   3425      * </ul></p>
   3426      *
   3427      * <p>If the sensor can't expose this exact duration, it will shorten the
   3428      * duration exposed to the nearest possible value (rather than expose longer).
   3429      * The final exposure time used will be available in the output capture result.</p>
   3430      * <p>This control is only effective if ACAMERA_CONTROL_AE_MODE or ACAMERA_CONTROL_MODE is set to
   3431      * OFF; otherwise the auto-exposure algorithm will override this value.</p>
   3432      *
   3433      * @see ACAMERA_CONTROL_AE_MODE
   3434      * @see ACAMERA_CONTROL_MODE
   3435      */
   3436     ACAMERA_SENSOR_EXPOSURE_TIME =                              // int64
   3437             ACAMERA_SENSOR_START,
   3438     /**
   3439      * <p>Duration from start of frame exposure to
   3440      * start of next frame exposure.</p>
   3441      *
   3442      * <p>Type: int64</p>
   3443      *
   3444      * <p>This tag may appear in:
   3445      * <ul>
   3446      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   3447      *   <li>ACaptureRequest</li>
   3448      * </ul></p>
   3449      *
   3450      * <p>The maximum frame rate that can be supported by a camera subsystem is
   3451      * a function of many factors:</p>
   3452      * <ul>
   3453      * <li>Requested resolutions of output image streams</li>
   3454      * <li>Availability of binning / skipping modes on the imager</li>
   3455      * <li>The bandwidth of the imager interface</li>
   3456      * <li>The bandwidth of the various ISP processing blocks</li>
   3457      * </ul>
   3458      * <p>Since these factors can vary greatly between different ISPs and
   3459      * sensors, the camera abstraction tries to represent the bandwidth
   3460      * restrictions with as simple a model as possible.</p>
   3461      * <p>The model presented has the following characteristics:</p>
   3462      * <ul>
   3463      * <li>The image sensor is always configured to output the smallest
   3464      * resolution possible given the application's requested output stream
   3465      * sizes.  The smallest resolution is defined as being at least as large
   3466      * as the largest requested output stream size; the camera pipeline must
   3467      * never digitally upsample sensor data when the crop region covers the
   3468      * whole sensor. In general, this means that if only small output stream
   3469      * resolutions are configured, the sensor can provide a higher frame
   3470      * rate.</li>
   3471      * <li>Since any request may use any or all the currently configured
   3472      * output streams, the sensor and ISP must be configured to support
   3473      * scaling a single capture to all the streams at the same time.  This
   3474      * means the camera pipeline must be ready to produce the largest
   3475      * requested output size without any delay.  Therefore, the overall
   3476      * frame rate of a given configured stream set is governed only by the
   3477      * largest requested stream resolution.</li>
   3478      * <li>Using more than one output stream in a request does not affect the
   3479      * frame duration.</li>
   3480      * <li>Certain format-streams may need to do additional background processing
   3481      * before data is consumed/produced by that stream. These processors
   3482      * can run concurrently to the rest of the camera pipeline, but
   3483      * cannot process more than 1 capture at a time.</li>
   3484      * </ul>
   3485      * <p>The necessary information for the application, given the model above, is provided via
   3486      * {@link ACAMERA_SCALER_AVAILABLE_MIN_FRAME_DURATIONS }.
   3487      * These are used to determine the maximum frame rate / minimum frame duration that is
   3488      * possible for a given stream configuration.</p>
   3489      * <p>Specifically, the application can use the following rules to
   3490      * determine the minimum frame duration it can request from the camera
   3491      * device:</p>
   3492      * <ol>
   3493      * <li>Let the set of currently configured input/output streams be called <code>S</code>.</li>
   3494      * <li>Find the minimum frame durations for each stream in <code>S</code>, by looking it up in {@link ACAMERA_SCALER_AVAILABLE_MIN_FRAME_DURATIONS }
   3495      * (with its respective size/format). Let this set of frame durations be called <code>F</code>.</li>
   3496      * <li>For any given request <code>R</code>, the minimum frame duration allowed for <code>R</code> is the maximum
   3497      * out of all values in <code>F</code>. Let the streams used in <code>R</code> be called <code>S_r</code>.</li>
   3498      * </ol>
   3499      * <p>If none of the streams in <code>S_r</code> have a stall time (listed in {@link ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS }
   3500      * using its respective size/format), then the frame duration in <code>F</code> determines the steady
   3501      * state frame rate that the application will get if it uses <code>R</code> as a repeating request. Let
   3502      * this special kind of request be called <code>Rsimple</code>.</p>
   3503      * <p>A repeating request <code>Rsimple</code> can be <em>occasionally</em> interleaved by a single capture of a
   3504      * new request <code>Rstall</code> (which has at least one in-use stream with a non-0 stall time) and if
   3505      * <code>Rstall</code> has the same minimum frame duration this will not cause a frame rate loss if all
   3506      * buffers from the previous <code>Rstall</code> have already been delivered.</p>
   3507      * <p>For more details about stalling, see {@link ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS }.</p>
   3508      * <p>This control is only effective if ACAMERA_CONTROL_AE_MODE or ACAMERA_CONTROL_MODE is set to
   3509      * OFF; otherwise the auto-exposure algorithm will override this value.</p>
   3510      *
   3511      * @see ACAMERA_CONTROL_AE_MODE
   3512      * @see ACAMERA_CONTROL_MODE
   3513      */
   3514     ACAMERA_SENSOR_FRAME_DURATION =                             // int64
   3515             ACAMERA_SENSOR_START + 1,
   3516     /**
   3517      * <p>The amount of gain applied to sensor data
   3518      * before processing.</p>
   3519      *
   3520      * <p>Type: int32</p>
   3521      *
   3522      * <p>This tag may appear in:
   3523      * <ul>
   3524      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   3525      *   <li>ACaptureRequest</li>
   3526      * </ul></p>
   3527      *
   3528      * <p>The sensitivity is the standard ISO sensitivity value,
   3529      * as defined in ISO 12232:2006.</p>
   3530      * <p>The sensitivity must be within ACAMERA_SENSOR_INFO_SENSITIVITY_RANGE, and
   3531      * if if it less than ACAMERA_SENSOR_MAX_ANALOG_SENSITIVITY, the camera device
   3532      * is guaranteed to use only analog amplification for applying the gain.</p>
   3533      * <p>If the camera device cannot apply the exact sensitivity
   3534      * requested, it will reduce the gain to the nearest supported
   3535      * value. The final sensitivity used will be available in the
   3536      * output capture result.</p>
   3537      * <p>This control is only effective if ACAMERA_CONTROL_AE_MODE or ACAMERA_CONTROL_MODE is set to
   3538      * OFF; otherwise the auto-exposure algorithm will override this value.</p>
   3539      *
   3540      * @see ACAMERA_CONTROL_AE_MODE
   3541      * @see ACAMERA_CONTROL_MODE
   3542      * @see ACAMERA_SENSOR_INFO_SENSITIVITY_RANGE
   3543      * @see ACAMERA_SENSOR_MAX_ANALOG_SENSITIVITY
   3544      */
   3545     ACAMERA_SENSOR_SENSITIVITY =                                // int32
   3546             ACAMERA_SENSOR_START + 2,
   3547     /**
   3548      * <p>The standard reference illuminant used as the scene light source when
   3549      * calculating the ACAMERA_SENSOR_COLOR_TRANSFORM1,
   3550      * ACAMERA_SENSOR_CALIBRATION_TRANSFORM1, and
   3551      * ACAMERA_SENSOR_FORWARD_MATRIX1 matrices.</p>
   3552      *
   3553      * @see ACAMERA_SENSOR_CALIBRATION_TRANSFORM1
   3554      * @see ACAMERA_SENSOR_COLOR_TRANSFORM1
   3555      * @see ACAMERA_SENSOR_FORWARD_MATRIX1
   3556      *
   3557      * <p>Type: byte (acamera_metadata_enum_android_sensor_reference_illuminant1_t)</p>
   3558      *
   3559      * <p>This tag may appear in:
   3560      * <ul>
   3561      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3562      * </ul></p>
   3563      *
   3564      * <p>The values in this key correspond to the values defined for the
   3565      * EXIF LightSource tag. These illuminants are standard light sources
   3566      * that are often used calibrating camera devices.</p>
   3567      * <p>If this key is present, then ACAMERA_SENSOR_COLOR_TRANSFORM1,
   3568      * ACAMERA_SENSOR_CALIBRATION_TRANSFORM1, and
   3569      * ACAMERA_SENSOR_FORWARD_MATRIX1 will also be present.</p>
   3570      * <p>Some devices may choose to provide a second set of calibration
   3571      * information for improved quality, including
   3572      * ACAMERA_SENSOR_REFERENCE_ILLUMINANT2 and its corresponding matrices.</p>
   3573      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3574      * the camera device has RAW capability.</p>
   3575      *
   3576      * @see ACAMERA_SENSOR_CALIBRATION_TRANSFORM1
   3577      * @see ACAMERA_SENSOR_COLOR_TRANSFORM1
   3578      * @see ACAMERA_SENSOR_FORWARD_MATRIX1
   3579      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT2
   3580      */
   3581     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1 =                      // byte (acamera_metadata_enum_android_sensor_reference_illuminant1_t)
   3582             ACAMERA_SENSOR_START + 3,
   3583     /**
   3584      * <p>The standard reference illuminant used as the scene light source when
   3585      * calculating the ACAMERA_SENSOR_COLOR_TRANSFORM2,
   3586      * ACAMERA_SENSOR_CALIBRATION_TRANSFORM2, and
   3587      * ACAMERA_SENSOR_FORWARD_MATRIX2 matrices.</p>
   3588      *
   3589      * @see ACAMERA_SENSOR_CALIBRATION_TRANSFORM2
   3590      * @see ACAMERA_SENSOR_COLOR_TRANSFORM2
   3591      * @see ACAMERA_SENSOR_FORWARD_MATRIX2
   3592      *
   3593      * <p>Type: byte</p>
   3594      *
   3595      * <p>This tag may appear in:
   3596      * <ul>
   3597      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3598      * </ul></p>
   3599      *
   3600      * <p>See ACAMERA_SENSOR_REFERENCE_ILLUMINANT1 for more details.</p>
   3601      * <p>If this key is present, then ACAMERA_SENSOR_COLOR_TRANSFORM2,
   3602      * ACAMERA_SENSOR_CALIBRATION_TRANSFORM2, and
   3603      * ACAMERA_SENSOR_FORWARD_MATRIX2 will also be present.</p>
   3604      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3605      * the camera device has RAW capability.</p>
   3606      *
   3607      * @see ACAMERA_SENSOR_CALIBRATION_TRANSFORM2
   3608      * @see ACAMERA_SENSOR_COLOR_TRANSFORM2
   3609      * @see ACAMERA_SENSOR_FORWARD_MATRIX2
   3610      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT1
   3611      */
   3612     ACAMERA_SENSOR_REFERENCE_ILLUMINANT2 =                      // byte
   3613             ACAMERA_SENSOR_START + 4,
   3614     /**
   3615      * <p>A per-device calibration transform matrix that maps from the
   3616      * reference sensor colorspace to the actual device sensor colorspace.</p>
   3617      *
   3618      * <p>Type: rational[3*3]</p>
   3619      *
   3620      * <p>This tag may appear in:
   3621      * <ul>
   3622      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3623      * </ul></p>
   3624      *
   3625      * <p>This matrix is used to correct for per-device variations in the
   3626      * sensor colorspace, and is used for processing raw buffer data.</p>
   3627      * <p>The matrix is expressed as a 3x3 matrix in row-major-order, and
   3628      * contains a per-device calibration transform that maps colors
   3629      * from reference sensor color space (i.e. the "golden module"
   3630      * colorspace) into this camera device's native sensor color
   3631      * space under the first reference illuminant
   3632      * (ACAMERA_SENSOR_REFERENCE_ILLUMINANT1).</p>
   3633      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3634      * the camera device has RAW capability.</p>
   3635      *
   3636      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT1
   3637      */
   3638     ACAMERA_SENSOR_CALIBRATION_TRANSFORM1 =                     // rational[3*3]
   3639             ACAMERA_SENSOR_START + 5,
   3640     /**
   3641      * <p>A per-device calibration transform matrix that maps from the
   3642      * reference sensor colorspace to the actual device sensor colorspace
   3643      * (this is the colorspace of the raw buffer data).</p>
   3644      *
   3645      * <p>Type: rational[3*3]</p>
   3646      *
   3647      * <p>This tag may appear in:
   3648      * <ul>
   3649      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3650      * </ul></p>
   3651      *
   3652      * <p>This matrix is used to correct for per-device variations in the
   3653      * sensor colorspace, and is used for processing raw buffer data.</p>
   3654      * <p>The matrix is expressed as a 3x3 matrix in row-major-order, and
   3655      * contains a per-device calibration transform that maps colors
   3656      * from reference sensor color space (i.e. the "golden module"
   3657      * colorspace) into this camera device's native sensor color
   3658      * space under the second reference illuminant
   3659      * (ACAMERA_SENSOR_REFERENCE_ILLUMINANT2).</p>
   3660      * <p>This matrix will only be present if the second reference
   3661      * illuminant is present.</p>
   3662      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3663      * the camera device has RAW capability.</p>
   3664      *
   3665      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT2
   3666      */
   3667     ACAMERA_SENSOR_CALIBRATION_TRANSFORM2 =                     // rational[3*3]
   3668             ACAMERA_SENSOR_START + 6,
   3669     /**
   3670      * <p>A matrix that transforms color values from CIE XYZ color space to
   3671      * reference sensor color space.</p>
   3672      *
   3673      * <p>Type: rational[3*3]</p>
   3674      *
   3675      * <p>This tag may appear in:
   3676      * <ul>
   3677      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3678      * </ul></p>
   3679      *
   3680      * <p>This matrix is used to convert from the standard CIE XYZ color
   3681      * space to the reference sensor colorspace, and is used when processing
   3682      * raw buffer data.</p>
   3683      * <p>The matrix is expressed as a 3x3 matrix in row-major-order, and
   3684      * contains a color transform matrix that maps colors from the CIE
   3685      * XYZ color space to the reference sensor color space (i.e. the
   3686      * "golden module" colorspace) under the first reference illuminant
   3687      * (ACAMERA_SENSOR_REFERENCE_ILLUMINANT1).</p>
   3688      * <p>The white points chosen in both the reference sensor color space
   3689      * and the CIE XYZ colorspace when calculating this transform will
   3690      * match the standard white point for the first reference illuminant
   3691      * (i.e. no chromatic adaptation will be applied by this transform).</p>
   3692      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3693      * the camera device has RAW capability.</p>
   3694      *
   3695      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT1
   3696      */
   3697     ACAMERA_SENSOR_COLOR_TRANSFORM1 =                           // rational[3*3]
   3698             ACAMERA_SENSOR_START + 7,
   3699     /**
   3700      * <p>A matrix that transforms color values from CIE XYZ color space to
   3701      * reference sensor color space.</p>
   3702      *
   3703      * <p>Type: rational[3*3]</p>
   3704      *
   3705      * <p>This tag may appear in:
   3706      * <ul>
   3707      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3708      * </ul></p>
   3709      *
   3710      * <p>This matrix is used to convert from the standard CIE XYZ color
   3711      * space to the reference sensor colorspace, and is used when processing
   3712      * raw buffer data.</p>
   3713      * <p>The matrix is expressed as a 3x3 matrix in row-major-order, and
   3714      * contains a color transform matrix that maps colors from the CIE
   3715      * XYZ color space to the reference sensor color space (i.e. the
   3716      * "golden module" colorspace) under the second reference illuminant
   3717      * (ACAMERA_SENSOR_REFERENCE_ILLUMINANT2).</p>
   3718      * <p>The white points chosen in both the reference sensor color space
   3719      * and the CIE XYZ colorspace when calculating this transform will
   3720      * match the standard white point for the second reference illuminant
   3721      * (i.e. no chromatic adaptation will be applied by this transform).</p>
   3722      * <p>This matrix will only be present if the second reference
   3723      * illuminant is present.</p>
   3724      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3725      * the camera device has RAW capability.</p>
   3726      *
   3727      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT2
   3728      */
   3729     ACAMERA_SENSOR_COLOR_TRANSFORM2 =                           // rational[3*3]
   3730             ACAMERA_SENSOR_START + 8,
   3731     /**
   3732      * <p>A matrix that transforms white balanced camera colors from the reference
   3733      * sensor colorspace to the CIE XYZ colorspace with a D50 whitepoint.</p>
   3734      *
   3735      * <p>Type: rational[3*3]</p>
   3736      *
   3737      * <p>This tag may appear in:
   3738      * <ul>
   3739      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3740      * </ul></p>
   3741      *
   3742      * <p>This matrix is used to convert to the standard CIE XYZ colorspace, and
   3743      * is used when processing raw buffer data.</p>
   3744      * <p>This matrix is expressed as a 3x3 matrix in row-major-order, and contains
   3745      * a color transform matrix that maps white balanced colors from the
   3746      * reference sensor color space to the CIE XYZ color space with a D50 white
   3747      * point.</p>
   3748      * <p>Under the first reference illuminant (ACAMERA_SENSOR_REFERENCE_ILLUMINANT1)
   3749      * this matrix is chosen so that the standard white point for this reference
   3750      * illuminant in the reference sensor colorspace is mapped to D50 in the
   3751      * CIE XYZ colorspace.</p>
   3752      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3753      * the camera device has RAW capability.</p>
   3754      *
   3755      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT1
   3756      */
   3757     ACAMERA_SENSOR_FORWARD_MATRIX1 =                            // rational[3*3]
   3758             ACAMERA_SENSOR_START + 9,
   3759     /**
   3760      * <p>A matrix that transforms white balanced camera colors from the reference
   3761      * sensor colorspace to the CIE XYZ colorspace with a D50 whitepoint.</p>
   3762      *
   3763      * <p>Type: rational[3*3]</p>
   3764      *
   3765      * <p>This tag may appear in:
   3766      * <ul>
   3767      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3768      * </ul></p>
   3769      *
   3770      * <p>This matrix is used to convert to the standard CIE XYZ colorspace, and
   3771      * is used when processing raw buffer data.</p>
   3772      * <p>This matrix is expressed as a 3x3 matrix in row-major-order, and contains
   3773      * a color transform matrix that maps white balanced colors from the
   3774      * reference sensor color space to the CIE XYZ color space with a D50 white
   3775      * point.</p>
   3776      * <p>Under the second reference illuminant (ACAMERA_SENSOR_REFERENCE_ILLUMINANT2)
   3777      * this matrix is chosen so that the standard white point for this reference
   3778      * illuminant in the reference sensor colorspace is mapped to D50 in the
   3779      * CIE XYZ colorspace.</p>
   3780      * <p>This matrix will only be present if the second reference
   3781      * illuminant is present.</p>
   3782      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3783      * the camera device has RAW capability.</p>
   3784      *
   3785      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT2
   3786      */
   3787     ACAMERA_SENSOR_FORWARD_MATRIX2 =                            // rational[3*3]
   3788             ACAMERA_SENSOR_START + 10,
   3789     /**
   3790      * <p>A fixed black level offset for each of the color filter arrangement
   3791      * (CFA) mosaic channels.</p>
   3792      *
   3793      * <p>Type: int32[4]</p>
   3794      *
   3795      * <p>This tag may appear in:
   3796      * <ul>
   3797      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3798      * </ul></p>
   3799      *
   3800      * <p>This key specifies the zero light value for each of the CFA mosaic
   3801      * channels in the camera sensor.  The maximal value output by the
   3802      * sensor is represented by the value in ACAMERA_SENSOR_INFO_WHITE_LEVEL.</p>
   3803      * <p>The values are given in the same order as channels listed for the CFA
   3804      * layout key (see ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT), i.e. the
   3805      * nth value given corresponds to the black level offset for the nth
   3806      * color channel listed in the CFA.</p>
   3807      * <p>The black level values of captured images may vary for different
   3808      * capture settings (e.g., ACAMERA_SENSOR_SENSITIVITY). This key
   3809      * represents a coarse approximation for such case. It is recommended to
   3810      * use ACAMERA_SENSOR_DYNAMIC_BLACK_LEVEL or use pixels from
   3811      * ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS directly for captures when
   3812      * supported by the camera device, which provides more accurate black
   3813      * level values. For raw capture in particular, it is recommended to use
   3814      * pixels from ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS to calculate black
   3815      * level values for each frame.</p>
   3816      * <p>For a MONOCHROME camera device, all of the 2x2 channels must have the same values.</p>
   3817      *
   3818      * @see ACAMERA_SENSOR_DYNAMIC_BLACK_LEVEL
   3819      * @see ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT
   3820      * @see ACAMERA_SENSOR_INFO_WHITE_LEVEL
   3821      * @see ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS
   3822      * @see ACAMERA_SENSOR_SENSITIVITY
   3823      */
   3824     ACAMERA_SENSOR_BLACK_LEVEL_PATTERN =                        // int32[4]
   3825             ACAMERA_SENSOR_START + 12,
   3826     /**
   3827      * <p>Maximum sensitivity that is implemented
   3828      * purely through analog gain.</p>
   3829      *
   3830      * <p>Type: int32</p>
   3831      *
   3832      * <p>This tag may appear in:
   3833      * <ul>
   3834      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3835      * </ul></p>
   3836      *
   3837      * <p>For ACAMERA_SENSOR_SENSITIVITY values less than or
   3838      * equal to this, all applied gain must be analog. For
   3839      * values above this, the gain applied can be a mix of analog and
   3840      * digital.</p>
   3841      *
   3842      * @see ACAMERA_SENSOR_SENSITIVITY
   3843      */
   3844     ACAMERA_SENSOR_MAX_ANALOG_SENSITIVITY =                     // int32
   3845             ACAMERA_SENSOR_START + 13,
   3846     /**
   3847      * <p>Clockwise angle through which the output image needs to be rotated to be
   3848      * upright on the device screen in its native orientation.</p>
   3849      *
   3850      * <p>Type: int32</p>
   3851      *
   3852      * <p>This tag may appear in:
   3853      * <ul>
   3854      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   3855      * </ul></p>
   3856      *
   3857      * <p>Also defines the direction of rolling shutter readout, which is from top to bottom in
   3858      * the sensor's coordinate system.</p>
   3859      */
   3860     ACAMERA_SENSOR_ORIENTATION =                                // int32
   3861             ACAMERA_SENSOR_START + 14,
   3862     /**
   3863      * <p>Time at start of exposure of first
   3864      * row of the image sensor active array, in nanoseconds.</p>
   3865      *
   3866      * <p>Type: int64</p>
   3867      *
   3868      * <p>This tag may appear in:
   3869      * <ul>
   3870      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   3871      * </ul></p>
   3872      *
   3873      * <p>The timestamps are also included in all image
   3874      * buffers produced for the same capture, and will be identical
   3875      * on all the outputs.</p>
   3876      * <p>When ACAMERA_SENSOR_INFO_TIMESTAMP_SOURCE <code>==</code> UNKNOWN,
   3877      * the timestamps measure time since an unspecified starting point,
   3878      * and are monotonically increasing. They can be compared with the
   3879      * timestamps for other captures from the same camera device, but are
   3880      * not guaranteed to be comparable to any other time source.</p>
   3881      * <p>When ACAMERA_SENSOR_INFO_TIMESTAMP_SOURCE <code>==</code> REALTIME, the
   3882      * timestamps measure time in the same timebase as <a href="https://developer.android.com/reference/android/os/SystemClock.html#elapsedRealtimeNanos">SystemClock#elapsedRealtimeNanos</a>, and they can
   3883      * be compared to other timestamps from other subsystems that
   3884      * are using that base.</p>
   3885      * <p>For reprocessing, the timestamp will match the start of exposure of
   3886      * the input image, i.e. <a href="https://developer.android.com/reference/CaptureResult.html#SENSOR_TIMESTAMP">the
   3887      * timestamp</a> in the TotalCaptureResult that was used to create the
   3888      * reprocess capture request.</p>
   3889      *
   3890      * @see ACAMERA_SENSOR_INFO_TIMESTAMP_SOURCE
   3891      */
   3892     ACAMERA_SENSOR_TIMESTAMP =                                  // int64
   3893             ACAMERA_SENSOR_START + 16,
   3894     /**
   3895      * <p>The estimated camera neutral color in the native sensor colorspace at
   3896      * the time of capture.</p>
   3897      *
   3898      * <p>Type: rational[3]</p>
   3899      *
   3900      * <p>This tag may appear in:
   3901      * <ul>
   3902      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   3903      * </ul></p>
   3904      *
   3905      * <p>This value gives the neutral color point encoded as an RGB value in the
   3906      * native sensor color space.  The neutral color point indicates the
   3907      * currently estimated white point of the scene illumination.  It can be
   3908      * used to interpolate between the provided color transforms when
   3909      * processing raw sensor data.</p>
   3910      * <p>The order of the values is R, G, B; where R is in the lowest index.</p>
   3911      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3912      * the camera device has RAW capability.</p>
   3913      */
   3914     ACAMERA_SENSOR_NEUTRAL_COLOR_POINT =                        // rational[3]
   3915             ACAMERA_SENSOR_START + 18,
   3916     /**
   3917      * <p>Noise model coefficients for each CFA mosaic channel.</p>
   3918      *
   3919      * <p>Type: double[2*CFA Channels]</p>
   3920      *
   3921      * <p>This tag may appear in:
   3922      * <ul>
   3923      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   3924      * </ul></p>
   3925      *
   3926      * <p>This key contains two noise model coefficients for each CFA channel
   3927      * corresponding to the sensor amplification (S) and sensor readout
   3928      * noise (O).  These are given as pairs of coefficients for each channel
   3929      * in the same order as channels listed for the CFA layout key
   3930      * (see ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT).  This is
   3931      * represented as an array of Pair&lt;Double, Double&gt;, where
   3932      * the first member of the Pair at index n is the S coefficient and the
   3933      * second member is the O coefficient for the nth color channel in the CFA.</p>
   3934      * <p>These coefficients are used in a two parameter noise model to describe
   3935      * the amount of noise present in the image for each CFA channel.  The
   3936      * noise model used here is:</p>
   3937      * <p>N(x) = sqrt(Sx + O)</p>
   3938      * <p>Where x represents the recorded signal of a CFA channel normalized to
   3939      * the range [0, 1], and S and O are the noise model coeffiecients for
   3940      * that channel.</p>
   3941      * <p>A more detailed description of the noise model can be found in the
   3942      * Adobe DNG specification for the NoiseProfile tag.</p>
   3943      * <p>For a MONOCHROME camera, there is only one color channel. So the noise model coefficients
   3944      * will only contain one S and one O.</p>
   3945      *
   3946      * @see ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT
   3947      */
   3948     ACAMERA_SENSOR_NOISE_PROFILE =                              // double[2*CFA Channels]
   3949             ACAMERA_SENSOR_START + 19,
   3950     /**
   3951      * <p>The worst-case divergence between Bayer green channels.</p>
   3952      *
   3953      * <p>Type: float</p>
   3954      *
   3955      * <p>This tag may appear in:
   3956      * <ul>
   3957      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   3958      * </ul></p>
   3959      *
   3960      * <p>This value is an estimate of the worst case split between the
   3961      * Bayer green channels in the red and blue rows in the sensor color
   3962      * filter array.</p>
   3963      * <p>The green split is calculated as follows:</p>
   3964      * <ol>
   3965      * <li>A 5x5 pixel (or larger) window W within the active sensor array is
   3966      * chosen. The term 'pixel' here is taken to mean a group of 4 Bayer
   3967      * mosaic channels (R, Gr, Gb, B).  The location and size of the window
   3968      * chosen is implementation defined, and should be chosen to provide a
   3969      * green split estimate that is both representative of the entire image
   3970      * for this camera sensor, and can be calculated quickly.</li>
   3971      * <li>The arithmetic mean of the green channels from the red
   3972      * rows (mean_Gr) within W is computed.</li>
   3973      * <li>The arithmetic mean of the green channels from the blue
   3974      * rows (mean_Gb) within W is computed.</li>
   3975      * <li>The maximum ratio R of the two means is computed as follows:
   3976      * <code>R = max((mean_Gr + 1)/(mean_Gb + 1), (mean_Gb + 1)/(mean_Gr + 1))</code></li>
   3977      * </ol>
   3978      * <p>The ratio R is the green split divergence reported for this property,
   3979      * which represents how much the green channels differ in the mosaic
   3980      * pattern.  This value is typically used to determine the treatment of
   3981      * the green mosaic channels when demosaicing.</p>
   3982      * <p>The green split value can be roughly interpreted as follows:</p>
   3983      * <ul>
   3984      * <li>R &lt; 1.03 is a negligible split (&lt;3% divergence).</li>
   3985      * <li>1.20 &lt;= R &gt;= 1.03 will require some software
   3986      * correction to avoid demosaic errors (3-20% divergence).</li>
   3987      * <li>R &gt; 1.20 will require strong software correction to produce
   3988      * a usuable image (&gt;20% divergence).</li>
   3989      * </ul>
   3990      * <p>Starting from Android Q, this key will not be present for a MONOCHROME camera, even if
   3991      * the camera device has RAW capability.</p>
   3992      */
   3993     ACAMERA_SENSOR_GREEN_SPLIT =                                // float
   3994             ACAMERA_SENSOR_START + 22,
   3995     /**
   3996      * <p>A pixel <code>[R, G_even, G_odd, B]</code> that supplies the test pattern
   3997      * when ACAMERA_SENSOR_TEST_PATTERN_MODE is SOLID_COLOR.</p>
   3998      *
   3999      * @see ACAMERA_SENSOR_TEST_PATTERN_MODE
   4000      *
   4001      * <p>Type: int32[4]</p>
   4002      *
   4003      * <p>This tag may appear in:
   4004      * <ul>
   4005      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4006      *   <li>ACaptureRequest</li>
   4007      * </ul></p>
   4008      *
   4009      * <p>Each color channel is treated as an unsigned 32-bit integer.
   4010      * The camera device then uses the most significant X bits
   4011      * that correspond to how many bits are in its Bayer raw sensor
   4012      * output.</p>
   4013      * <p>For example, a sensor with RAW10 Bayer output would use the
   4014      * 10 most significant bits from each color channel.</p>
   4015      */
   4016     ACAMERA_SENSOR_TEST_PATTERN_DATA =                          // int32[4]
   4017             ACAMERA_SENSOR_START + 23,
   4018     /**
   4019      * <p>When enabled, the sensor sends a test pattern instead of
   4020      * doing a real exposure from the camera.</p>
   4021      *
   4022      * <p>Type: int32 (acamera_metadata_enum_android_sensor_test_pattern_mode_t)</p>
   4023      *
   4024      * <p>This tag may appear in:
   4025      * <ul>
   4026      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4027      *   <li>ACaptureRequest</li>
   4028      * </ul></p>
   4029      *
   4030      * <p>When a test pattern is enabled, all manual sensor controls specified
   4031      * by ACAMERA_SENSOR_* will be ignored. All other controls should
   4032      * work as normal.</p>
   4033      * <p>For example, if manual flash is enabled, flash firing should still
   4034      * occur (and that the test pattern remain unmodified, since the flash
   4035      * would not actually affect it).</p>
   4036      * <p>Defaults to OFF.</p>
   4037      */
   4038     ACAMERA_SENSOR_TEST_PATTERN_MODE =                          // int32 (acamera_metadata_enum_android_sensor_test_pattern_mode_t)
   4039             ACAMERA_SENSOR_START + 24,
   4040     /**
   4041      * <p>List of sensor test pattern modes for ACAMERA_SENSOR_TEST_PATTERN_MODE
   4042      * supported by this camera device.</p>
   4043      *
   4044      * @see ACAMERA_SENSOR_TEST_PATTERN_MODE
   4045      *
   4046      * <p>Type: int32[n]</p>
   4047      *
   4048      * <p>This tag may appear in:
   4049      * <ul>
   4050      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4051      * </ul></p>
   4052      *
   4053      * <p>Defaults to OFF, and always includes OFF if defined.</p>
   4054      */
   4055     ACAMERA_SENSOR_AVAILABLE_TEST_PATTERN_MODES =               // int32[n]
   4056             ACAMERA_SENSOR_START + 25,
   4057     /**
   4058      * <p>Duration between the start of first row exposure
   4059      * and the start of last row exposure.</p>
   4060      *
   4061      * <p>Type: int64</p>
   4062      *
   4063      * <p>This tag may appear in:
   4064      * <ul>
   4065      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4066      * </ul></p>
   4067      *
   4068      * <p>This is the exposure time skew between the first and last
   4069      * row exposure start times. The first row and the last row are
   4070      * the first and last rows inside of the
   4071      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.</p>
   4072      * <p>For typical camera sensors that use rolling shutters, this is also equivalent
   4073      * to the frame readout time.</p>
   4074      *
   4075      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   4076      */
   4077     ACAMERA_SENSOR_ROLLING_SHUTTER_SKEW =                       // int64
   4078             ACAMERA_SENSOR_START + 26,
   4079     /**
   4080      * <p>List of disjoint rectangles indicating the sensor
   4081      * optically shielded black pixel regions.</p>
   4082      *
   4083      * <p>Type: int32[4*num_regions]</p>
   4084      *
   4085      * <p>This tag may appear in:
   4086      * <ul>
   4087      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4088      * </ul></p>
   4089      *
   4090      * <p>In most camera sensors, the active array is surrounded by some
   4091      * optically shielded pixel areas. By blocking light, these pixels
   4092      * provides a reliable black reference for black level compensation
   4093      * in active array region.</p>
   4094      * <p>This key provides a list of disjoint rectangles specifying the
   4095      * regions of optically shielded (with metal shield) black pixel
   4096      * regions if the camera device is capable of reading out these black
   4097      * pixels in the output raw images. In comparison to the fixed black
   4098      * level values reported by ACAMERA_SENSOR_BLACK_LEVEL_PATTERN, this key
   4099      * may provide a more accurate way for the application to calculate
   4100      * black level of each captured raw images.</p>
   4101      * <p>When this key is reported, the ACAMERA_SENSOR_DYNAMIC_BLACK_LEVEL and
   4102      * ACAMERA_SENSOR_DYNAMIC_WHITE_LEVEL will also be reported.</p>
   4103      * <p>The data representation is <code>int[4]</code>, which maps to <code>(left, top, width, height)</code>.</p>
   4104      *
   4105      * @see ACAMERA_SENSOR_BLACK_LEVEL_PATTERN
   4106      * @see ACAMERA_SENSOR_DYNAMIC_BLACK_LEVEL
   4107      * @see ACAMERA_SENSOR_DYNAMIC_WHITE_LEVEL
   4108      */
   4109     ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS =                      // int32[4*num_regions]
   4110             ACAMERA_SENSOR_START + 27,
   4111     /**
   4112      * <p>A per-frame dynamic black level offset for each of the color filter
   4113      * arrangement (CFA) mosaic channels.</p>
   4114      *
   4115      * <p>Type: float[4]</p>
   4116      *
   4117      * <p>This tag may appear in:
   4118      * <ul>
   4119      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4120      * </ul></p>
   4121      *
   4122      * <p>Camera sensor black levels may vary dramatically for different
   4123      * capture settings (e.g. ACAMERA_SENSOR_SENSITIVITY). The fixed black
   4124      * level reported by ACAMERA_SENSOR_BLACK_LEVEL_PATTERN may be too
   4125      * inaccurate to represent the actual value on a per-frame basis. The
   4126      * camera device internal pipeline relies on reliable black level values
   4127      * to process the raw images appropriately. To get the best image
   4128      * quality, the camera device may choose to estimate the per frame black
   4129      * level values either based on optically shielded black regions
   4130      * (ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS) or its internal model.</p>
   4131      * <p>This key reports the camera device estimated per-frame zero light
   4132      * value for each of the CFA mosaic channels in the camera sensor. The
   4133      * ACAMERA_SENSOR_BLACK_LEVEL_PATTERN may only represent a coarse
   4134      * approximation of the actual black level values. This value is the
   4135      * black level used in camera device internal image processing pipeline
   4136      * and generally more accurate than the fixed black level values.
   4137      * However, since they are estimated values by the camera device, they
   4138      * may not be as accurate as the black level values calculated from the
   4139      * optical black pixels reported by ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS.</p>
   4140      * <p>The values are given in the same order as channels listed for the CFA
   4141      * layout key (see ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT), i.e. the
   4142      * nth value given corresponds to the black level offset for the nth
   4143      * color channel listed in the CFA.</p>
   4144      * <p>For a MONOCHROME camera, all of the 2x2 channels must have the same values.</p>
   4145      * <p>This key will be available if ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS is available or the
   4146      * camera device advertises this key via {@link ACAMERA_REQUEST_AVAILABLE_RESULT_KEYS }.</p>
   4147      *
   4148      * @see ACAMERA_SENSOR_BLACK_LEVEL_PATTERN
   4149      * @see ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT
   4150      * @see ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS
   4151      * @see ACAMERA_SENSOR_SENSITIVITY
   4152      */
   4153     ACAMERA_SENSOR_DYNAMIC_BLACK_LEVEL =                        // float[4]
   4154             ACAMERA_SENSOR_START + 28,
   4155     /**
   4156      * <p>Maximum raw value output by sensor for this frame.</p>
   4157      *
   4158      * <p>Type: int32</p>
   4159      *
   4160      * <p>This tag may appear in:
   4161      * <ul>
   4162      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4163      * </ul></p>
   4164      *
   4165      * <p>Since the ACAMERA_SENSOR_BLACK_LEVEL_PATTERN may change for different
   4166      * capture settings (e.g., ACAMERA_SENSOR_SENSITIVITY), the white
   4167      * level will change accordingly. This key is similar to
   4168      * ACAMERA_SENSOR_INFO_WHITE_LEVEL, but specifies the camera device
   4169      * estimated white level for each frame.</p>
   4170      * <p>This key will be available if ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS is
   4171      * available or the camera device advertises this key via
   4172      * {@link ACAMERA_REQUEST_AVAILABLE_RESULT_KEYS }.</p>
   4173      *
   4174      * @see ACAMERA_SENSOR_BLACK_LEVEL_PATTERN
   4175      * @see ACAMERA_SENSOR_INFO_WHITE_LEVEL
   4176      * @see ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS
   4177      * @see ACAMERA_SENSOR_SENSITIVITY
   4178      */
   4179     ACAMERA_SENSOR_DYNAMIC_WHITE_LEVEL =                        // int32
   4180             ACAMERA_SENSOR_START + 29,
   4181     ACAMERA_SENSOR_END,
   4182 
   4183     /**
   4184      * <p>The area of the image sensor which corresponds to active pixels after any geometric
   4185      * distortion correction has been applied.</p>
   4186      *
   4187      * <p>Type: int32[4]</p>
   4188      *
   4189      * <p>This tag may appear in:
   4190      * <ul>
   4191      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4192      * </ul></p>
   4193      *
   4194      * <p>This is the rectangle representing the size of the active region of the sensor (i.e.
   4195      * the region that actually receives light from the scene) after any geometric correction
   4196      * has been applied, and should be treated as the maximum size in pixels of any of the
   4197      * image output formats aside from the raw formats.</p>
   4198      * <p>This rectangle is defined relative to the full pixel array; (0,0) is the top-left of
   4199      * the full pixel array, and the size of the full pixel array is given by
   4200      * ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE.</p>
   4201      * <p>The coordinate system for most other keys that list pixel coordinates, including
   4202      * ACAMERA_SCALER_CROP_REGION, is defined relative to the active array rectangle given in
   4203      * this field, with <code>(0, 0)</code> being the top-left of this rectangle.</p>
   4204      * <p>The active array may be smaller than the full pixel array, since the full array may
   4205      * include black calibration pixels or other inactive regions.</p>
   4206      * <p>For devices that do not support ACAMERA_DISTORTION_CORRECTION_MODE control, the active
   4207      * array must be the same as ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.</p>
   4208      * <p>For devices that support ACAMERA_DISTORTION_CORRECTION_MODE control, the active array must
   4209      * be enclosed by ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE. The difference between
   4210      * pre-correction active array and active array accounts for scaling or cropping caused
   4211      * by lens geometric distortion correction.</p>
   4212      * <p>In general, application should always refer to active array size for controls like
   4213      * metering regions or crop region. Two exceptions are when the application is dealing with
   4214      * RAW image buffers (RAW_SENSOR, RAW10, RAW12 etc), or when application explicitly set
   4215      * ACAMERA_DISTORTION_CORRECTION_MODE to OFF. In these cases, application should refer
   4216      * to ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.</p>
   4217      * <p>The data representation is <code>int[4]</code>, which maps to <code>(left, top, width, height)</code>.</p>
   4218      *
   4219      * @see ACAMERA_DISTORTION_CORRECTION_MODE
   4220      * @see ACAMERA_SCALER_CROP_REGION
   4221      * @see ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE
   4222      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
   4223      */
   4224     ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE =                     // int32[4]
   4225             ACAMERA_SENSOR_INFO_START,
   4226     /**
   4227      * <p>Range of sensitivities for ACAMERA_SENSOR_SENSITIVITY supported by this
   4228      * camera device.</p>
   4229      *
   4230      * @see ACAMERA_SENSOR_SENSITIVITY
   4231      *
   4232      * <p>Type: int32[2]</p>
   4233      *
   4234      * <p>This tag may appear in:
   4235      * <ul>
   4236      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4237      * </ul></p>
   4238      *
   4239      * <p>The values are the standard ISO sensitivity values,
   4240      * as defined in ISO 12232:2006.</p>
   4241      */
   4242     ACAMERA_SENSOR_INFO_SENSITIVITY_RANGE =                     // int32[2]
   4243             ACAMERA_SENSOR_INFO_START + 1,
   4244     /**
   4245      * <p>The arrangement of color filters on sensor;
   4246      * represents the colors in the top-left 2x2 section of
   4247      * the sensor, in reading order, for a Bayer camera, or the
   4248      * light spectrum it captures for MONOCHROME camera.</p>
   4249      *
   4250      * <p>Type: byte (acamera_metadata_enum_android_sensor_info_color_filter_arrangement_t)</p>
   4251      *
   4252      * <p>This tag may appear in:
   4253      * <ul>
   4254      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4255      * </ul></p>
   4256      *
   4257      */
   4258     ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT =              // byte (acamera_metadata_enum_android_sensor_info_color_filter_arrangement_t)
   4259             ACAMERA_SENSOR_INFO_START + 2,
   4260     /**
   4261      * <p>The range of image exposure times for ACAMERA_SENSOR_EXPOSURE_TIME supported
   4262      * by this camera device.</p>
   4263      *
   4264      * @see ACAMERA_SENSOR_EXPOSURE_TIME
   4265      *
   4266      * <p>Type: int64[2]</p>
   4267      *
   4268      * <p>This tag may appear in:
   4269      * <ul>
   4270      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4271      * </ul></p>
   4272      *
   4273      */
   4274     ACAMERA_SENSOR_INFO_EXPOSURE_TIME_RANGE =                   // int64[2]
   4275             ACAMERA_SENSOR_INFO_START + 3,
   4276     /**
   4277      * <p>The maximum possible frame duration (minimum frame rate) for
   4278      * ACAMERA_SENSOR_FRAME_DURATION that is supported this camera device.</p>
   4279      *
   4280      * @see ACAMERA_SENSOR_FRAME_DURATION
   4281      *
   4282      * <p>Type: int64</p>
   4283      *
   4284      * <p>This tag may appear in:
   4285      * <ul>
   4286      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4287      * </ul></p>
   4288      *
   4289      * <p>Attempting to use frame durations beyond the maximum will result in the frame
   4290      * duration being clipped to the maximum. See that control for a full definition of frame
   4291      * durations.</p>
   4292      * <p>Refer to {@link ACAMERA_SCALER_AVAILABLE_MIN_FRAME_DURATIONS }
   4293      * for the minimum frame duration values.</p>
   4294      */
   4295     ACAMERA_SENSOR_INFO_MAX_FRAME_DURATION =                    // int64
   4296             ACAMERA_SENSOR_INFO_START + 4,
   4297     /**
   4298      * <p>The physical dimensions of the full pixel
   4299      * array.</p>
   4300      *
   4301      * <p>Type: float[2]</p>
   4302      *
   4303      * <p>This tag may appear in:
   4304      * <ul>
   4305      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4306      * </ul></p>
   4307      *
   4308      * <p>This is the physical size of the sensor pixel
   4309      * array defined by ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE.</p>
   4310      *
   4311      * @see ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE
   4312      */
   4313     ACAMERA_SENSOR_INFO_PHYSICAL_SIZE =                         // float[2]
   4314             ACAMERA_SENSOR_INFO_START + 5,
   4315     /**
   4316      * <p>Dimensions of the full pixel array, possibly
   4317      * including black calibration pixels.</p>
   4318      *
   4319      * <p>Type: int32[2]</p>
   4320      *
   4321      * <p>This tag may appear in:
   4322      * <ul>
   4323      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4324      * </ul></p>
   4325      *
   4326      * <p>The pixel count of the full pixel array of the image sensor, which covers
   4327      * ACAMERA_SENSOR_INFO_PHYSICAL_SIZE area.  This represents the full pixel dimensions of
   4328      * the raw buffers produced by this sensor.</p>
   4329      * <p>If a camera device supports raw sensor formats, either this or
   4330      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE is the maximum dimensions for the raw
   4331      * output formats listed in {@link ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS }
   4332      * (this depends on whether or not the image sensor returns buffers containing pixels that
   4333      * are not part of the active array region for blacklevel calibration or other purposes).</p>
   4334      * <p>Some parts of the full pixel array may not receive light from the scene,
   4335      * or be otherwise inactive.  The ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE key
   4336      * defines the rectangle of active pixels that will be included in processed image
   4337      * formats.</p>
   4338      *
   4339      * @see ACAMERA_SENSOR_INFO_PHYSICAL_SIZE
   4340      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
   4341      */
   4342     ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE =                      // int32[2]
   4343             ACAMERA_SENSOR_INFO_START + 6,
   4344     /**
   4345      * <p>Maximum raw value output by sensor.</p>
   4346      *
   4347      * <p>Type: int32</p>
   4348      *
   4349      * <p>This tag may appear in:
   4350      * <ul>
   4351      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4352      * </ul></p>
   4353      *
   4354      * <p>This specifies the fully-saturated encoding level for the raw
   4355      * sample values from the sensor.  This is typically caused by the
   4356      * sensor becoming highly non-linear or clipping. The minimum for
   4357      * each channel is specified by the offset in the
   4358      * ACAMERA_SENSOR_BLACK_LEVEL_PATTERN key.</p>
   4359      * <p>The white level is typically determined either by sensor bit depth
   4360      * (8-14 bits is expected), or by the point where the sensor response
   4361      * becomes too non-linear to be useful.  The default value for this is
   4362      * maximum representable value for a 16-bit raw sample (2^16 - 1).</p>
   4363      * <p>The white level values of captured images may vary for different
   4364      * capture settings (e.g., ACAMERA_SENSOR_SENSITIVITY). This key
   4365      * represents a coarse approximation for such case. It is recommended
   4366      * to use ACAMERA_SENSOR_DYNAMIC_WHITE_LEVEL for captures when supported
   4367      * by the camera device, which provides more accurate white level values.</p>
   4368      *
   4369      * @see ACAMERA_SENSOR_BLACK_LEVEL_PATTERN
   4370      * @see ACAMERA_SENSOR_DYNAMIC_WHITE_LEVEL
   4371      * @see ACAMERA_SENSOR_SENSITIVITY
   4372      */
   4373     ACAMERA_SENSOR_INFO_WHITE_LEVEL =                           // int32
   4374             ACAMERA_SENSOR_INFO_START + 7,
   4375     /**
   4376      * <p>The time base source for sensor capture start timestamps.</p>
   4377      *
   4378      * <p>Type: byte (acamera_metadata_enum_android_sensor_info_timestamp_source_t)</p>
   4379      *
   4380      * <p>This tag may appear in:
   4381      * <ul>
   4382      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4383      * </ul></p>
   4384      *
   4385      * <p>The timestamps provided for captures are always in nanoseconds and monotonic, but
   4386      * may not based on a time source that can be compared to other system time sources.</p>
   4387      * <p>This characteristic defines the source for the timestamps, and therefore whether they
   4388      * can be compared against other system time sources/timestamps.</p>
   4389      */
   4390     ACAMERA_SENSOR_INFO_TIMESTAMP_SOURCE =                      // byte (acamera_metadata_enum_android_sensor_info_timestamp_source_t)
   4391             ACAMERA_SENSOR_INFO_START + 8,
   4392     /**
   4393      * <p>Whether the RAW images output from this camera device are subject to
   4394      * lens shading correction.</p>
   4395      *
   4396      * <p>Type: byte (acamera_metadata_enum_android_sensor_info_lens_shading_applied_t)</p>
   4397      *
   4398      * <p>This tag may appear in:
   4399      * <ul>
   4400      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4401      * </ul></p>
   4402      *
   4403      * <p>If TRUE, all images produced by the camera device in the RAW image formats will
   4404      * have lens shading correction already applied to it. If FALSE, the images will
   4405      * not be adjusted for lens shading correction.
   4406      * See android.request.maxNumOutputRaw for a list of RAW image formats.</p>
   4407      * <p>This key will be <code>null</code> for all devices do not report this information.
   4408      * Devices with RAW capability will always report this information in this key.</p>
   4409      */
   4410     ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED =                  // byte (acamera_metadata_enum_android_sensor_info_lens_shading_applied_t)
   4411             ACAMERA_SENSOR_INFO_START + 9,
   4412     /**
   4413      * <p>The area of the image sensor which corresponds to active pixels prior to the
   4414      * application of any geometric distortion correction.</p>
   4415      *
   4416      * <p>Type: int32[4]</p>
   4417      *
   4418      * <p>This tag may appear in:
   4419      * <ul>
   4420      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4421      * </ul></p>
   4422      *
   4423      * <p>This is the rectangle representing the size of the active region of the sensor (i.e.
   4424      * the region that actually receives light from the scene) before any geometric correction
   4425      * has been applied, and should be treated as the active region rectangle for any of the
   4426      * raw formats.  All metadata associated with raw processing (e.g. the lens shading
   4427      * correction map, and radial distortion fields) treats the top, left of this rectangle as
   4428      * the origin, (0,0).</p>
   4429      * <p>The size of this region determines the maximum field of view and the maximum number of
   4430      * pixels that an image from this sensor can contain, prior to the application of
   4431      * geometric distortion correction. The effective maximum pixel dimensions of a
   4432      * post-distortion-corrected image is given by the ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   4433      * field, and the effective maximum field of view for a post-distortion-corrected image
   4434      * can be calculated by applying the geometric distortion correction fields to this
   4435      * rectangle, and cropping to the rectangle given in ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.</p>
   4436      * <p>E.g. to calculate position of a pixel, (x,y), in a processed YUV output image with the
   4437      * dimensions in ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE given the position of a pixel,
   4438      * (x', y'), in the raw pixel array with dimensions give in
   4439      * ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE:</p>
   4440      * <ol>
   4441      * <li>Choose a pixel (x', y') within the active array region of the raw buffer given in
   4442      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, otherwise this pixel is considered
   4443      * to be outside of the FOV, and will not be shown in the processed output image.</li>
   4444      * <li>Apply geometric distortion correction to get the post-distortion pixel coordinate,
   4445      * (x_i, y_i). When applying geometric correction metadata, note that metadata for raw
   4446      * buffers is defined relative to the top, left of the
   4447      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE rectangle.</li>
   4448      * <li>If the resulting corrected pixel coordinate is within the region given in
   4449      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, then the position of this pixel in the
   4450      * processed output image buffer is <code>(x_i - activeArray.left, y_i - activeArray.top)</code>,
   4451      * when the top, left coordinate of that buffer is treated as (0, 0).</li>
   4452      * </ol>
   4453      * <p>Thus, for pixel x',y' = (25, 25) on a sensor where ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE
   4454      * is (100,100), ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE is (10, 10, 100, 100),
   4455      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE is (20, 20, 80, 80), and the geometric distortion
   4456      * correction doesn't change the pixel coordinate, the resulting pixel selected in
   4457      * pixel coordinates would be x,y = (25, 25) relative to the top,left of the raw buffer
   4458      * with dimensions given in ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE, and would be (5, 5)
   4459      * relative to the top,left of post-processed YUV output buffer with dimensions given in
   4460      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.</p>
   4461      * <p>The currently supported fields that correct for geometric distortion are:</p>
   4462      * <ol>
   4463      * <li>ACAMERA_LENS_DISTORTION.</li>
   4464      * </ol>
   4465      * <p>If the camera device doesn't support geometric distortion correction, or all of the
   4466      * geometric distortion fields are no-ops, this rectangle will be the same as the
   4467      * post-distortion-corrected rectangle given in ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.</p>
   4468      * <p>This rectangle is defined relative to the full pixel array; (0,0) is the top-left of
   4469      * the full pixel array, and the size of the full pixel array is given by
   4470      * ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE.</p>
   4471      * <p>The pre-correction active array may be smaller than the full pixel array, since the
   4472      * full array may include black calibration pixels or other inactive regions.</p>
   4473      * <p>The data representation is <code>int[4]</code>, which maps to <code>(left, top, width, height)</code>.</p>
   4474      *
   4475      * @see ACAMERA_LENS_DISTORTION
   4476      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   4477      * @see ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE
   4478      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
   4479      */
   4480     ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE =      // int32[4]
   4481             ACAMERA_SENSOR_INFO_START + 10,
   4482     ACAMERA_SENSOR_INFO_END,
   4483 
   4484     /**
   4485      * <p>Quality of lens shading correction applied
   4486      * to the image data.</p>
   4487      *
   4488      * <p>Type: byte (acamera_metadata_enum_android_shading_mode_t)</p>
   4489      *
   4490      * <p>This tag may appear in:
   4491      * <ul>
   4492      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4493      *   <li>ACaptureRequest</li>
   4494      * </ul></p>
   4495      *
   4496      * <p>When set to OFF mode, no lens shading correction will be applied by the
   4497      * camera device, and an identity lens shading map data will be provided
   4498      * if <code>ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE == ON</code>. For example, for lens
   4499      * shading map with size of <code>[ 4, 3 ]</code>,
   4500      * the output android.statistics.lensShadingCorrectionMap for this case will be an identity
   4501      * map shown below:</p>
   4502      * <pre><code>[ 1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
   4503      *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
   4504      *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
   4505      *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
   4506      *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0,
   4507      *  1.0, 1.0, 1.0, 1.0,  1.0, 1.0, 1.0, 1.0 ]
   4508      * </code></pre>
   4509      * <p>When set to other modes, lens shading correction will be applied by the camera
   4510      * device. Applications can request lens shading map data by setting
   4511      * ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE to ON, and then the camera device will provide lens
   4512      * shading map data in android.statistics.lensShadingCorrectionMap; the returned shading map
   4513      * data will be the one applied by the camera device for this capture request.</p>
   4514      * <p>The shading map data may depend on the auto-exposure (AE) and AWB statistics, therefore
   4515      * the reliability of the map data may be affected by the AE and AWB algorithms. When AE and
   4516      * AWB are in AUTO modes(ACAMERA_CONTROL_AE_MODE <code>!=</code> OFF and ACAMERA_CONTROL_AWB_MODE <code>!=</code>
   4517      * OFF), to get best results, it is recommended that the applications wait for the AE and AWB
   4518      * to be converged before using the returned shading map data.</p>
   4519      *
   4520      * @see ACAMERA_CONTROL_AE_MODE
   4521      * @see ACAMERA_CONTROL_AWB_MODE
   4522      * @see ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE
   4523      */
   4524     ACAMERA_SHADING_MODE =                                      // byte (acamera_metadata_enum_android_shading_mode_t)
   4525             ACAMERA_SHADING_START,
   4526     /**
   4527      * <p>List of lens shading modes for ACAMERA_SHADING_MODE that are supported by this camera device.</p>
   4528      *
   4529      * @see ACAMERA_SHADING_MODE
   4530      *
   4531      * <p>Type: byte[n]</p>
   4532      *
   4533      * <p>This tag may appear in:
   4534      * <ul>
   4535      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4536      * </ul></p>
   4537      *
   4538      * <p>This list contains lens shading modes that can be set for the camera device.
   4539      * Camera devices that support the MANUAL_POST_PROCESSING capability will always
   4540      * list OFF and FAST mode. This includes all FULL level devices.
   4541      * LEGACY devices will always only support FAST mode.</p>
   4542      */
   4543     ACAMERA_SHADING_AVAILABLE_MODES =                           // byte[n]
   4544             ACAMERA_SHADING_START + 2,
   4545     ACAMERA_SHADING_END,
   4546 
   4547     /**
   4548      * <p>Operating mode for the face detector
   4549      * unit.</p>
   4550      *
   4551      * <p>Type: byte (acamera_metadata_enum_android_statistics_face_detect_mode_t)</p>
   4552      *
   4553      * <p>This tag may appear in:
   4554      * <ul>
   4555      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4556      *   <li>ACaptureRequest</li>
   4557      * </ul></p>
   4558      *
   4559      * <p>Whether face detection is enabled, and whether it
   4560      * should output just the basic fields or the full set of
   4561      * fields.</p>
   4562      */
   4563     ACAMERA_STATISTICS_FACE_DETECT_MODE =                       // byte (acamera_metadata_enum_android_statistics_face_detect_mode_t)
   4564             ACAMERA_STATISTICS_START,
   4565     /**
   4566      * <p>Operating mode for hot pixel map generation.</p>
   4567      *
   4568      * <p>Type: byte (acamera_metadata_enum_android_statistics_hot_pixel_map_mode_t)</p>
   4569      *
   4570      * <p>This tag may appear in:
   4571      * <ul>
   4572      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4573      *   <li>ACaptureRequest</li>
   4574      * </ul></p>
   4575      *
   4576      * <p>If set to <code>true</code>, a hot pixel map is returned in ACAMERA_STATISTICS_HOT_PIXEL_MAP.
   4577      * If set to <code>false</code>, no hot pixel map will be returned.</p>
   4578      *
   4579      * @see ACAMERA_STATISTICS_HOT_PIXEL_MAP
   4580      */
   4581     ACAMERA_STATISTICS_HOT_PIXEL_MAP_MODE =                     // byte (acamera_metadata_enum_android_statistics_hot_pixel_map_mode_t)
   4582             ACAMERA_STATISTICS_START + 3,
   4583     /**
   4584      * <p>List of unique IDs for detected faces.</p>
   4585      *
   4586      * <p>Type: int32[n]</p>
   4587      *
   4588      * <p>This tag may appear in:
   4589      * <ul>
   4590      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4591      * </ul></p>
   4592      *
   4593      * <p>Each detected face is given a unique ID that is valid for as long as the face is visible
   4594      * to the camera device.  A face that leaves the field of view and later returns may be
   4595      * assigned a new ID.</p>
   4596      * <p>Only available if ACAMERA_STATISTICS_FACE_DETECT_MODE == FULL</p>
   4597      *
   4598      * @see ACAMERA_STATISTICS_FACE_DETECT_MODE
   4599      */
   4600     ACAMERA_STATISTICS_FACE_IDS =                               // int32[n]
   4601             ACAMERA_STATISTICS_START + 4,
   4602     /**
   4603      * <p>List of landmarks for detected
   4604      * faces.</p>
   4605      *
   4606      * <p>Type: int32[n*6]</p>
   4607      *
   4608      * <p>This tag may appear in:
   4609      * <ul>
   4610      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4611      * </ul></p>
   4612      *
   4613      * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
   4614      * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with <code>(0, 0)</code> being
   4615      * the top-left pixel of the active array.</p>
   4616      * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
   4617      * system depends on the mode being set.
   4618      * When the distortion correction mode is OFF, the coordinate system follows
   4619      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
   4620      * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array.
   4621      * When the distortion correction mode is not OFF, the coordinate system follows
   4622      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
   4623      * <code>(0, 0)</code> being the top-left pixel of the active array.</p>
   4624      * <p>Only available if ACAMERA_STATISTICS_FACE_DETECT_MODE == FULL</p>
   4625      *
   4626      * @see ACAMERA_DISTORTION_CORRECTION_MODE
   4627      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   4628      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
   4629      * @see ACAMERA_STATISTICS_FACE_DETECT_MODE
   4630      */
   4631     ACAMERA_STATISTICS_FACE_LANDMARKS =                         // int32[n*6]
   4632             ACAMERA_STATISTICS_START + 5,
   4633     /**
   4634      * <p>List of the bounding rectangles for detected
   4635      * faces.</p>
   4636      *
   4637      * <p>Type: int32[n*4]</p>
   4638      *
   4639      * <p>This tag may appear in:
   4640      * <ul>
   4641      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4642      * </ul></p>
   4643      *
   4644      * <p>For devices not supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
   4645      * system always follows that of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with <code>(0, 0)</code> being
   4646      * the top-left pixel of the active array.</p>
   4647      * <p>For devices supporting ACAMERA_DISTORTION_CORRECTION_MODE control, the coordinate
   4648      * system depends on the mode being set.
   4649      * When the distortion correction mode is OFF, the coordinate system follows
   4650      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE, with
   4651      * <code>(0, 0)</code> being the top-left pixel of the pre-correction active array.
   4652      * When the distortion correction mode is not OFF, the coordinate system follows
   4653      * ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE, with
   4654      * <code>(0, 0)</code> being the top-left pixel of the active array.</p>
   4655      * <p>Only available if ACAMERA_STATISTICS_FACE_DETECT_MODE != OFF
   4656      * The data representation is <code>int[4]</code>, which maps to <code>(left, top, right, bottom)</code>.</p>
   4657      *
   4658      * @see ACAMERA_DISTORTION_CORRECTION_MODE
   4659      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   4660      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
   4661      * @see ACAMERA_STATISTICS_FACE_DETECT_MODE
   4662      */
   4663     ACAMERA_STATISTICS_FACE_RECTANGLES =                        // int32[n*4]
   4664             ACAMERA_STATISTICS_START + 6,
   4665     /**
   4666      * <p>List of the face confidence scores for
   4667      * detected faces</p>
   4668      *
   4669      * <p>Type: byte[n]</p>
   4670      *
   4671      * <p>This tag may appear in:
   4672      * <ul>
   4673      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4674      * </ul></p>
   4675      *
   4676      * <p>Only available if ACAMERA_STATISTICS_FACE_DETECT_MODE != OFF.</p>
   4677      *
   4678      * @see ACAMERA_STATISTICS_FACE_DETECT_MODE
   4679      */
   4680     ACAMERA_STATISTICS_FACE_SCORES =                            // byte[n]
   4681             ACAMERA_STATISTICS_START + 7,
   4682     /**
   4683      * <p>The shading map is a low-resolution floating-point map
   4684      * that lists the coefficients used to correct for vignetting and color shading,
   4685      * for each Bayer color channel of RAW image data.</p>
   4686      *
   4687      * <p>Type: float[4*n*m]</p>
   4688      *
   4689      * <p>This tag may appear in:
   4690      * <ul>
   4691      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4692      * </ul></p>
   4693      *
   4694      * <p>The map provided here is the same map that is used by the camera device to
   4695      * correct both color shading and vignetting for output non-RAW images.</p>
   4696      * <p>When there is no lens shading correction applied to RAW
   4697      * output images (ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED <code>==</code>
   4698      * false), this map is the complete lens shading correction
   4699      * map; when there is some lens shading correction applied to
   4700      * the RAW output image (ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED<code>==</code> true), this map reports the remaining lens shading
   4701      * correction map that needs to be applied to get shading
   4702      * corrected images that match the camera device's output for
   4703      * non-RAW formats.</p>
   4704      * <p>For a complete shading correction map, the least shaded
   4705      * section of the image will have a gain factor of 1; all
   4706      * other sections will have gains above 1.</p>
   4707      * <p>When ACAMERA_COLOR_CORRECTION_MODE = TRANSFORM_MATRIX, the map
   4708      * will take into account the colorCorrection settings.</p>
   4709      * <p>The shading map is for the entire active pixel array, and is not
   4710      * affected by the crop region specified in the request. Each shading map
   4711      * entry is the value of the shading compensation map over a specific
   4712      * pixel on the sensor.  Specifically, with a (N x M) resolution shading
   4713      * map, and an active pixel array size (W x H), shading map entry
   4714      * (x,y)  (0 ... N-1, 0 ... M-1) is the value of the shading map at
   4715      * pixel ( ((W-1)/(N-1)) * x, ((H-1)/(M-1)) * y) for the four color channels.
   4716      * The map is assumed to be bilinearly interpolated between the sample points.</p>
   4717      * <p>For a Bayer camera, the channel order is [R, Geven, Godd, B], where Geven is
   4718      * the green channel for the even rows of a Bayer pattern, and Godd is the odd rows.
   4719      * The shading map is stored in a fully interleaved format, and its size
   4720      * is provided in the camera static metadata by ACAMERA_LENS_INFO_SHADING_MAP_SIZE.</p>
   4721      * <p>The shading map will generally have on the order of 30-40 rows and columns,
   4722      * and will be smaller than 64x64.</p>
   4723      * <p>As an example, given a very small map for a Bayer camera defined as:</p>
   4724      * <pre><code>ACAMERA_LENS_INFO_SHADING_MAP_SIZE = [ 4, 3 ]
   4725      * ACAMERA_STATISTICS_LENS_SHADING_MAP =
   4726      * [ 1.3, 1.2, 1.15, 1.2,  1.2, 1.2, 1.15, 1.2,
   4727      *     1.1, 1.2, 1.2, 1.2,  1.3, 1.2, 1.3, 1.3,
   4728      *   1.2, 1.2, 1.25, 1.1,  1.1, 1.1, 1.1, 1.0,
   4729      *     1.0, 1.0, 1.0, 1.0,  1.2, 1.3, 1.25, 1.2,
   4730      *   1.3, 1.2, 1.2, 1.3,   1.2, 1.15, 1.1, 1.2,
   4731      *     1.2, 1.1, 1.0, 1.2,  1.3, 1.15, 1.2, 1.3 ]
   4732      * </code></pre>
   4733      * <p>The low-resolution scaling map images for each channel are
   4734      * (displayed using nearest-neighbor interpolation):</p>
   4735      * <p><img alt="Red lens shading map" src="../images/camera2/metadata/android.statistics.lensShadingMap/red_shading.png" />
   4736      * <img alt="Green (even rows) lens shading map" src="../images/camera2/metadata/android.statistics.lensShadingMap/green_e_shading.png" />
   4737      * <img alt="Green (odd rows) lens shading map" src="../images/camera2/metadata/android.statistics.lensShadingMap/green_o_shading.png" />
   4738      * <img alt="Blue lens shading map" src="../images/camera2/metadata/android.statistics.lensShadingMap/blue_shading.png" /></p>
   4739      * <p>As a visualization only, inverting the full-color map to recover an
   4740      * image of a gray wall (using bicubic interpolation for visual quality)
   4741      * as captured by the sensor gives:</p>
   4742      * <p><img alt="Image of a uniform white wall (inverse shading map)" src="../images/camera2/metadata/android.statistics.lensShadingMap/inv_shading.png" /></p>
   4743      * <p>For a MONOCHROME camera, all of the 2x2 channels must have the same values. An example
   4744      * shading map for such a camera is defined as:</p>
   4745      * <pre><code>ACAMERA_LENS_INFO_SHADING_MAP_SIZE = [ 4, 3 ]
   4746      * ACAMERA_STATISTICS_LENS_SHADING_MAP =
   4747      * [ 1.3, 1.3, 1.3, 1.3,  1.2, 1.2, 1.2, 1.2,
   4748      *     1.1, 1.1, 1.1, 1.1,  1.3, 1.3, 1.3, 1.3,
   4749      *   1.2, 1.2, 1.2, 1.2,  1.1, 1.1, 1.1, 1.1,
   4750      *     1.0, 1.0, 1.0, 1.0,  1.2, 1.2, 1.2, 1.2,
   4751      *   1.3, 1.3, 1.3, 1.3,   1.2, 1.2, 1.2, 1.2,
   4752      *     1.2, 1.2, 1.2, 1.2,  1.3, 1.3, 1.3, 1.3 ]
   4753      * </code></pre>
   4754      * <p>Note that the RAW image data might be subject to lens shading
   4755      * correction not reported on this map. Query
   4756      * ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED to see if RAW image data has subject
   4757      * to lens shading correction. If ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED
   4758      * is TRUE, the RAW image data is subject to partial or full lens shading
   4759      * correction. In the case full lens shading correction is applied to RAW
   4760      * images, the gain factor map reported in this key will contain all 1.0 gains.
   4761      * In other words, the map reported in this key is the remaining lens shading
   4762      * that needs to be applied on the RAW image to get images without lens shading
   4763      * artifacts. See android.request.maxNumOutputRaw for a list of RAW image
   4764      * formats.</p>
   4765      *
   4766      * @see ACAMERA_COLOR_CORRECTION_MODE
   4767      * @see ACAMERA_LENS_INFO_SHADING_MAP_SIZE
   4768      * @see ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED
   4769      * @see ACAMERA_STATISTICS_LENS_SHADING_MAP
   4770      */
   4771     ACAMERA_STATISTICS_LENS_SHADING_MAP =                       // float[4*n*m]
   4772             ACAMERA_STATISTICS_START + 11,
   4773     /**
   4774      * <p>The camera device estimated scene illumination lighting
   4775      * frequency.</p>
   4776      *
   4777      * <p>Type: byte (acamera_metadata_enum_android_statistics_scene_flicker_t)</p>
   4778      *
   4779      * <p>This tag may appear in:
   4780      * <ul>
   4781      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4782      * </ul></p>
   4783      *
   4784      * <p>Many light sources, such as most fluorescent lights, flicker at a rate
   4785      * that depends on the local utility power standards. This flicker must be
   4786      * accounted for by auto-exposure routines to avoid artifacts in captured images.
   4787      * The camera device uses this entry to tell the application what the scene
   4788      * illuminant frequency is.</p>
   4789      * <p>When manual exposure control is enabled
   4790      * (<code>ACAMERA_CONTROL_AE_MODE == OFF</code> or <code>ACAMERA_CONTROL_MODE ==
   4791      * OFF</code>), the ACAMERA_CONTROL_AE_ANTIBANDING_MODE doesn't perform
   4792      * antibanding, and the application can ensure it selects
   4793      * exposure times that do not cause banding issues by looking
   4794      * into this metadata field. See
   4795      * ACAMERA_CONTROL_AE_ANTIBANDING_MODE for more details.</p>
   4796      * <p>Reports NONE if there doesn't appear to be flickering illumination.</p>
   4797      *
   4798      * @see ACAMERA_CONTROL_AE_ANTIBANDING_MODE
   4799      * @see ACAMERA_CONTROL_AE_MODE
   4800      * @see ACAMERA_CONTROL_MODE
   4801      */
   4802     ACAMERA_STATISTICS_SCENE_FLICKER =                          // byte (acamera_metadata_enum_android_statistics_scene_flicker_t)
   4803             ACAMERA_STATISTICS_START + 14,
   4804     /**
   4805      * <p>List of <code>(x, y)</code> coordinates of hot/defective pixels on the sensor.</p>
   4806      *
   4807      * <p>Type: int32[2*n]</p>
   4808      *
   4809      * <p>This tag may appear in:
   4810      * <ul>
   4811      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4812      * </ul></p>
   4813      *
   4814      * <p>A coordinate <code>(x, y)</code> must lie between <code>(0, 0)</code>, and
   4815      * <code>(width - 1, height - 1)</code> (inclusive), which are the top-left and
   4816      * bottom-right of the pixel array, respectively. The width and
   4817      * height dimensions are given in ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE.
   4818      * This may include hot pixels that lie outside of the active array
   4819      * bounds given by ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.</p>
   4820      *
   4821      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   4822      * @see ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE
   4823      */
   4824     ACAMERA_STATISTICS_HOT_PIXEL_MAP =                          // int32[2*n]
   4825             ACAMERA_STATISTICS_START + 15,
   4826     /**
   4827      * <p>Whether the camera device will output the lens
   4828      * shading map in output result metadata.</p>
   4829      *
   4830      * <p>Type: byte (acamera_metadata_enum_android_statistics_lens_shading_map_mode_t)</p>
   4831      *
   4832      * <p>This tag may appear in:
   4833      * <ul>
   4834      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4835      *   <li>ACaptureRequest</li>
   4836      * </ul></p>
   4837      *
   4838      * <p>When set to ON,
   4839      * ACAMERA_STATISTICS_LENS_SHADING_MAP will be provided in
   4840      * the output result metadata.</p>
   4841      * <p>ON is always supported on devices with the RAW capability.</p>
   4842      *
   4843      * @see ACAMERA_STATISTICS_LENS_SHADING_MAP
   4844      */
   4845     ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE =                  // byte (acamera_metadata_enum_android_statistics_lens_shading_map_mode_t)
   4846             ACAMERA_STATISTICS_START + 16,
   4847     /**
   4848      * <p>A control for selecting whether optical stabilization (OIS) position
   4849      * information is included in output result metadata.</p>
   4850      *
   4851      * <p>Type: byte (acamera_metadata_enum_android_statistics_ois_data_mode_t)</p>
   4852      *
   4853      * <p>This tag may appear in:
   4854      * <ul>
   4855      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4856      *   <li>ACaptureRequest</li>
   4857      * </ul></p>
   4858      *
   4859      * <p>Since optical image stabilization generally involves motion much faster than the duration
   4860      * of individualq image exposure, multiple OIS samples can be included for a single capture
   4861      * result. For example, if the OIS reporting operates at 200 Hz, a typical camera operating
   4862      * at 30fps may have 6-7 OIS samples per capture result. This information can be combined
   4863      * with the rolling shutter skew to account for lens motion during image exposure in
   4864      * post-processing algorithms.</p>
   4865      */
   4866     ACAMERA_STATISTICS_OIS_DATA_MODE =                          // byte (acamera_metadata_enum_android_statistics_ois_data_mode_t)
   4867             ACAMERA_STATISTICS_START + 17,
   4868     /**
   4869      * <p>An array of timestamps of OIS samples, in nanoseconds.</p>
   4870      *
   4871      * <p>Type: int64[n]</p>
   4872      *
   4873      * <p>This tag may appear in:
   4874      * <ul>
   4875      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4876      * </ul></p>
   4877      *
   4878      * <p>The array contains the timestamps of OIS samples. The timestamps are in the same
   4879      * timebase as and comparable to ACAMERA_SENSOR_TIMESTAMP.</p>
   4880      *
   4881      * @see ACAMERA_SENSOR_TIMESTAMP
   4882      */
   4883     ACAMERA_STATISTICS_OIS_TIMESTAMPS =                         // int64[n]
   4884             ACAMERA_STATISTICS_START + 18,
   4885     /**
   4886      * <p>An array of shifts of OIS samples, in x direction.</p>
   4887      *
   4888      * <p>Type: float[n]</p>
   4889      *
   4890      * <p>This tag may appear in:
   4891      * <ul>
   4892      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4893      * </ul></p>
   4894      *
   4895      * <p>The array contains the amount of shifts in x direction, in pixels, based on OIS samples.
   4896      * A positive value is a shift from left to right in the pre-correction active array
   4897      * coordinate system. For example, if the optical center is (1000, 500) in pre-correction
   4898      * active array coordinates, a shift of (3, 0) puts the new optical center at (1003, 500).</p>
   4899      * <p>The number of shifts must match the number of timestamps in
   4900      * ACAMERA_STATISTICS_OIS_TIMESTAMPS.</p>
   4901      * <p>The OIS samples are not affected by whether lens distortion correction is enabled (on
   4902      * supporting devices). They are always reported in pre-correction active array coordinates,
   4903      * since the scaling of OIS shifts would depend on the specific spot on the sensor the shift
   4904      * is needed.</p>
   4905      *
   4906      * @see ACAMERA_STATISTICS_OIS_TIMESTAMPS
   4907      */
   4908     ACAMERA_STATISTICS_OIS_X_SHIFTS =                           // float[n]
   4909             ACAMERA_STATISTICS_START + 19,
   4910     /**
   4911      * <p>An array of shifts of OIS samples, in y direction.</p>
   4912      *
   4913      * <p>Type: float[n]</p>
   4914      *
   4915      * <p>This tag may appear in:
   4916      * <ul>
   4917      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   4918      * </ul></p>
   4919      *
   4920      * <p>The array contains the amount of shifts in y direction, in pixels, based on OIS samples.
   4921      * A positive value is a shift from top to bottom in pre-correction active array coordinate
   4922      * system. For example, if the optical center is (1000, 500) in active array coordinates, a
   4923      * shift of (0, 5) puts the new optical center at (1000, 505).</p>
   4924      * <p>The number of shifts must match the number of timestamps in
   4925      * ACAMERA_STATISTICS_OIS_TIMESTAMPS.</p>
   4926      * <p>The OIS samples are not affected by whether lens distortion correction is enabled (on
   4927      * supporting devices). They are always reported in pre-correction active array coordinates,
   4928      * since the scaling of OIS shifts would depend on the specific spot on the sensor the shift
   4929      * is needed.</p>
   4930      *
   4931      * @see ACAMERA_STATISTICS_OIS_TIMESTAMPS
   4932      */
   4933     ACAMERA_STATISTICS_OIS_Y_SHIFTS =                           // float[n]
   4934             ACAMERA_STATISTICS_START + 20,
   4935     ACAMERA_STATISTICS_END,
   4936 
   4937     /**
   4938      * <p>List of face detection modes for ACAMERA_STATISTICS_FACE_DETECT_MODE that are
   4939      * supported by this camera device.</p>
   4940      *
   4941      * @see ACAMERA_STATISTICS_FACE_DETECT_MODE
   4942      *
   4943      * <p>Type: byte[n]</p>
   4944      *
   4945      * <p>This tag may appear in:
   4946      * <ul>
   4947      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4948      * </ul></p>
   4949      *
   4950      * <p>OFF is always supported.</p>
   4951      */
   4952     ACAMERA_STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES =       // byte[n]
   4953             ACAMERA_STATISTICS_INFO_START,
   4954     /**
   4955      * <p>The maximum number of simultaneously detectable
   4956      * faces.</p>
   4957      *
   4958      * <p>Type: int32</p>
   4959      *
   4960      * <p>This tag may appear in:
   4961      * <ul>
   4962      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4963      * </ul></p>
   4964      *
   4965      */
   4966     ACAMERA_STATISTICS_INFO_MAX_FACE_COUNT =                    // int32
   4967             ACAMERA_STATISTICS_INFO_START + 2,
   4968     /**
   4969      * <p>List of hot pixel map output modes for ACAMERA_STATISTICS_HOT_PIXEL_MAP_MODE that are
   4970      * supported by this camera device.</p>
   4971      *
   4972      * @see ACAMERA_STATISTICS_HOT_PIXEL_MAP_MODE
   4973      *
   4974      * <p>Type: byte[n]</p>
   4975      *
   4976      * <p>This tag may appear in:
   4977      * <ul>
   4978      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4979      * </ul></p>
   4980      *
   4981      * <p>If no hotpixel map output is available for this camera device, this will contain only
   4982      * <code>false</code>.</p>
   4983      * <p>ON is always supported on devices with the RAW capability.</p>
   4984      */
   4985     ACAMERA_STATISTICS_INFO_AVAILABLE_HOT_PIXEL_MAP_MODES =     // byte[n]
   4986             ACAMERA_STATISTICS_INFO_START + 6,
   4987     /**
   4988      * <p>List of lens shading map output modes for ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE that
   4989      * are supported by this camera device.</p>
   4990      *
   4991      * @see ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE
   4992      *
   4993      * <p>Type: byte[n]</p>
   4994      *
   4995      * <p>This tag may appear in:
   4996      * <ul>
   4997      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   4998      * </ul></p>
   4999      *
   5000      * <p>If no lens shading map output is available for this camera device, this key will
   5001      * contain only OFF.</p>
   5002      * <p>ON is always supported on devices with the RAW capability.
   5003      * LEGACY mode devices will always only support OFF.</p>
   5004      */
   5005     ACAMERA_STATISTICS_INFO_AVAILABLE_LENS_SHADING_MAP_MODES =  // byte[n]
   5006             ACAMERA_STATISTICS_INFO_START + 7,
   5007     /**
   5008      * <p>List of OIS data output modes for ACAMERA_STATISTICS_OIS_DATA_MODE that
   5009      * are supported by this camera device.</p>
   5010      *
   5011      * @see ACAMERA_STATISTICS_OIS_DATA_MODE
   5012      *
   5013      * <p>Type: byte[n]</p>
   5014      *
   5015      * <p>This tag may appear in:
   5016      * <ul>
   5017      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5018      * </ul></p>
   5019      *
   5020      * <p>If no OIS data output is available for this camera device, this key will
   5021      * contain only OFF.</p>
   5022      */
   5023     ACAMERA_STATISTICS_INFO_AVAILABLE_OIS_DATA_MODES =          // byte[n]
   5024             ACAMERA_STATISTICS_INFO_START + 8,
   5025     ACAMERA_STATISTICS_INFO_END,
   5026 
   5027     /**
   5028      * <p>Tonemapping / contrast / gamma curve for the blue
   5029      * channel, to use when ACAMERA_TONEMAP_MODE is
   5030      * CONTRAST_CURVE.</p>
   5031      *
   5032      * @see ACAMERA_TONEMAP_MODE
   5033      *
   5034      * <p>Type: float[n*2]</p>
   5035      *
   5036      * <p>This tag may appear in:
   5037      * <ul>
   5038      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5039      *   <li>ACaptureRequest</li>
   5040      * </ul></p>
   5041      *
   5042      * <p>See ACAMERA_TONEMAP_CURVE_RED for more details.</p>
   5043      *
   5044      * @see ACAMERA_TONEMAP_CURVE_RED
   5045      */
   5046     ACAMERA_TONEMAP_CURVE_BLUE =                                // float[n*2]
   5047             ACAMERA_TONEMAP_START,
   5048     /**
   5049      * <p>Tonemapping / contrast / gamma curve for the green
   5050      * channel, to use when ACAMERA_TONEMAP_MODE is
   5051      * CONTRAST_CURVE.</p>
   5052      *
   5053      * @see ACAMERA_TONEMAP_MODE
   5054      *
   5055      * <p>Type: float[n*2]</p>
   5056      *
   5057      * <p>This tag may appear in:
   5058      * <ul>
   5059      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5060      *   <li>ACaptureRequest</li>
   5061      * </ul></p>
   5062      *
   5063      * <p>See ACAMERA_TONEMAP_CURVE_RED for more details.</p>
   5064      *
   5065      * @see ACAMERA_TONEMAP_CURVE_RED
   5066      */
   5067     ACAMERA_TONEMAP_CURVE_GREEN =                               // float[n*2]
   5068             ACAMERA_TONEMAP_START + 1,
   5069     /**
   5070      * <p>Tonemapping / contrast / gamma curve for the red
   5071      * channel, to use when ACAMERA_TONEMAP_MODE is
   5072      * CONTRAST_CURVE.</p>
   5073      *
   5074      * @see ACAMERA_TONEMAP_MODE
   5075      *
   5076      * <p>Type: float[n*2]</p>
   5077      *
   5078      * <p>This tag may appear in:
   5079      * <ul>
   5080      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5081      *   <li>ACaptureRequest</li>
   5082      * </ul></p>
   5083      *
   5084      * <p>Each channel's curve is defined by an array of control points:</p>
   5085      * <pre><code>ACAMERA_TONEMAP_CURVE_RED =
   5086      *   [ P0in, P0out, P1in, P1out, P2in, P2out, P3in, P3out, ..., PNin, PNout ]
   5087      * 2 &lt;= N &lt;= ACAMERA_TONEMAP_MAX_CURVE_POINTS</code></pre>
   5088      * <p>These are sorted in order of increasing <code>Pin</code>; it is
   5089      * required that input values 0.0 and 1.0 are included in the list to
   5090      * define a complete mapping. For input values between control points,
   5091      * the camera device must linearly interpolate between the control
   5092      * points.</p>
   5093      * <p>Each curve can have an independent number of points, and the number
   5094      * of points can be less than max (that is, the request doesn't have to
   5095      * always provide a curve with number of points equivalent to
   5096      * ACAMERA_TONEMAP_MAX_CURVE_POINTS).</p>
   5097      * <p>For devices with MONOCHROME capability, all three channels must have the same set of
   5098      * control points.</p>
   5099      * <p>A few examples, and their corresponding graphical mappings; these
   5100      * only specify the red channel and the precision is limited to 4
   5101      * digits, for conciseness.</p>
   5102      * <p>Linear mapping:</p>
   5103      * <pre><code>ACAMERA_TONEMAP_CURVE_RED = [ 0, 0, 1.0, 1.0 ]
   5104      * </code></pre>
   5105      * <p><img alt="Linear mapping curve" src="../images/camera2/metadata/android.tonemap.curveRed/linear_tonemap.png" /></p>
   5106      * <p>Invert mapping:</p>
   5107      * <pre><code>ACAMERA_TONEMAP_CURVE_RED = [ 0, 1.0, 1.0, 0 ]
   5108      * </code></pre>
   5109      * <p><img alt="Inverting mapping curve" src="../images/camera2/metadata/android.tonemap.curveRed/inverse_tonemap.png" /></p>
   5110      * <p>Gamma 1/2.2 mapping, with 16 control points:</p>
   5111      * <pre><code>ACAMERA_TONEMAP_CURVE_RED = [
   5112      *   0.0000, 0.0000, 0.0667, 0.2920, 0.1333, 0.4002, 0.2000, 0.4812,
   5113      *   0.2667, 0.5484, 0.3333, 0.6069, 0.4000, 0.6594, 0.4667, 0.7072,
   5114      *   0.5333, 0.7515, 0.6000, 0.7928, 0.6667, 0.8317, 0.7333, 0.8685,
   5115      *   0.8000, 0.9035, 0.8667, 0.9370, 0.9333, 0.9691, 1.0000, 1.0000 ]
   5116      * </code></pre>
   5117      * <p><img alt="Gamma = 1/2.2 tonemapping curve" src="../images/camera2/metadata/android.tonemap.curveRed/gamma_tonemap.png" /></p>
   5118      * <p>Standard sRGB gamma mapping, per IEC 61966-2-1:1999, with 16 control points:</p>
   5119      * <pre><code>ACAMERA_TONEMAP_CURVE_RED = [
   5120      *   0.0000, 0.0000, 0.0667, 0.2864, 0.1333, 0.4007, 0.2000, 0.4845,
   5121      *   0.2667, 0.5532, 0.3333, 0.6125, 0.4000, 0.6652, 0.4667, 0.7130,
   5122      *   0.5333, 0.7569, 0.6000, 0.7977, 0.6667, 0.8360, 0.7333, 0.8721,
   5123      *   0.8000, 0.9063, 0.8667, 0.9389, 0.9333, 0.9701, 1.0000, 1.0000 ]
   5124      * </code></pre>
   5125      * <p><img alt="sRGB tonemapping curve" src="../images/camera2/metadata/android.tonemap.curveRed/srgb_tonemap.png" /></p>
   5126      *
   5127      * @see ACAMERA_TONEMAP_CURVE_RED
   5128      * @see ACAMERA_TONEMAP_MAX_CURVE_POINTS
   5129      */
   5130     ACAMERA_TONEMAP_CURVE_RED =                                 // float[n*2]
   5131             ACAMERA_TONEMAP_START + 2,
   5132     /**
   5133      * <p>High-level global contrast/gamma/tonemapping control.</p>
   5134      *
   5135      * <p>Type: byte (acamera_metadata_enum_android_tonemap_mode_t)</p>
   5136      *
   5137      * <p>This tag may appear in:
   5138      * <ul>
   5139      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5140      *   <li>ACaptureRequest</li>
   5141      * </ul></p>
   5142      *
   5143      * <p>When switching to an application-defined contrast curve by setting
   5144      * ACAMERA_TONEMAP_MODE to CONTRAST_CURVE, the curve is defined
   5145      * per-channel with a set of <code>(in, out)</code> points that specify the
   5146      * mapping from input high-bit-depth pixel value to the output
   5147      * low-bit-depth value.  Since the actual pixel ranges of both input
   5148      * and output may change depending on the camera pipeline, the values
   5149      * are specified by normalized floating-point numbers.</p>
   5150      * <p>More-complex color mapping operations such as 3D color look-up
   5151      * tables, selective chroma enhancement, or other non-linear color
   5152      * transforms will be disabled when ACAMERA_TONEMAP_MODE is
   5153      * CONTRAST_CURVE.</p>
   5154      * <p>When using either FAST or HIGH_QUALITY, the camera device will
   5155      * emit its own tonemap curve in android.tonemap.curve.
   5156      * These values are always available, and as close as possible to the
   5157      * actually used nonlinear/nonglobal transforms.</p>
   5158      * <p>If a request is sent with CONTRAST_CURVE with the camera device's
   5159      * provided curve in FAST or HIGH_QUALITY, the image's tonemap will be
   5160      * roughly the same.</p>
   5161      *
   5162      * @see ACAMERA_TONEMAP_MODE
   5163      */
   5164     ACAMERA_TONEMAP_MODE =                                      // byte (acamera_metadata_enum_android_tonemap_mode_t)
   5165             ACAMERA_TONEMAP_START + 3,
   5166     /**
   5167      * <p>Maximum number of supported points in the
   5168      * tonemap curve that can be used for android.tonemap.curve.</p>
   5169      *
   5170      * <p>Type: int32</p>
   5171      *
   5172      * <p>This tag may appear in:
   5173      * <ul>
   5174      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5175      * </ul></p>
   5176      *
   5177      * <p>If the actual number of points provided by the application (in ACAMERA_TONEMAPCURVE_*) is
   5178      * less than this maximum, the camera device will resample the curve to its internal
   5179      * representation, using linear interpolation.</p>
   5180      * <p>The output curves in the result metadata may have a different number
   5181      * of points than the input curves, and will represent the actual
   5182      * hardware curves used as closely as possible when linearly interpolated.</p>
   5183      */
   5184     ACAMERA_TONEMAP_MAX_CURVE_POINTS =                          // int32
   5185             ACAMERA_TONEMAP_START + 4,
   5186     /**
   5187      * <p>List of tonemapping modes for ACAMERA_TONEMAP_MODE that are supported by this camera
   5188      * device.</p>
   5189      *
   5190      * @see ACAMERA_TONEMAP_MODE
   5191      *
   5192      * <p>Type: byte[n]</p>
   5193      *
   5194      * <p>This tag may appear in:
   5195      * <ul>
   5196      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5197      * </ul></p>
   5198      *
   5199      * <p>Camera devices that support the MANUAL_POST_PROCESSING capability will always contain
   5200      * at least one of below mode combinations:</p>
   5201      * <ul>
   5202      * <li>CONTRAST_CURVE, FAST and HIGH_QUALITY</li>
   5203      * <li>GAMMA_VALUE, PRESET_CURVE, FAST and HIGH_QUALITY</li>
   5204      * </ul>
   5205      * <p>This includes all FULL level devices.</p>
   5206      */
   5207     ACAMERA_TONEMAP_AVAILABLE_TONE_MAP_MODES =                  // byte[n]
   5208             ACAMERA_TONEMAP_START + 5,
   5209     /**
   5210      * <p>Tonemapping curve to use when ACAMERA_TONEMAP_MODE is
   5211      * GAMMA_VALUE</p>
   5212      *
   5213      * @see ACAMERA_TONEMAP_MODE
   5214      *
   5215      * <p>Type: float</p>
   5216      *
   5217      * <p>This tag may appear in:
   5218      * <ul>
   5219      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5220      *   <li>ACaptureRequest</li>
   5221      * </ul></p>
   5222      *
   5223      * <p>The tonemap curve will be defined the following formula:
   5224      * * OUT = pow(IN, 1.0 / gamma)
   5225      * where IN and OUT is the input pixel value scaled to range [0.0, 1.0],
   5226      * pow is the power function and gamma is the gamma value specified by this
   5227      * key.</p>
   5228      * <p>The same curve will be applied to all color channels. The camera device
   5229      * may clip the input gamma value to its supported range. The actual applied
   5230      * value will be returned in capture result.</p>
   5231      * <p>The valid range of gamma value varies on different devices, but values
   5232      * within [1.0, 5.0] are guaranteed not to be clipped.</p>
   5233      */
   5234     ACAMERA_TONEMAP_GAMMA =                                     // float
   5235             ACAMERA_TONEMAP_START + 6,
   5236     /**
   5237      * <p>Tonemapping curve to use when ACAMERA_TONEMAP_MODE is
   5238      * PRESET_CURVE</p>
   5239      *
   5240      * @see ACAMERA_TONEMAP_MODE
   5241      *
   5242      * <p>Type: byte (acamera_metadata_enum_android_tonemap_preset_curve_t)</p>
   5243      *
   5244      * <p>This tag may appear in:
   5245      * <ul>
   5246      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5247      *   <li>ACaptureRequest</li>
   5248      * </ul></p>
   5249      *
   5250      * <p>The tonemap curve will be defined by specified standard.</p>
   5251      * <p>sRGB (approximated by 16 control points):</p>
   5252      * <p><img alt="sRGB tonemapping curve" src="../images/camera2/metadata/android.tonemap.curveRed/srgb_tonemap.png" /></p>
   5253      * <p>Rec. 709 (approximated by 16 control points):</p>
   5254      * <p><img alt="Rec. 709 tonemapping curve" src="../images/camera2/metadata/android.tonemap.curveRed/rec709_tonemap.png" /></p>
   5255      * <p>Note that above figures show a 16 control points approximation of preset
   5256      * curves. Camera devices may apply a different approximation to the curve.</p>
   5257      */
   5258     ACAMERA_TONEMAP_PRESET_CURVE =                              // byte (acamera_metadata_enum_android_tonemap_preset_curve_t)
   5259             ACAMERA_TONEMAP_START + 7,
   5260     ACAMERA_TONEMAP_END,
   5261 
   5262     /**
   5263      * <p>Generally classifies the overall set of the camera device functionality.</p>
   5264      *
   5265      * <p>Type: byte (acamera_metadata_enum_android_info_supported_hardware_level_t)</p>
   5266      *
   5267      * <p>This tag may appear in:
   5268      * <ul>
   5269      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5270      * </ul></p>
   5271      *
   5272      * <p>The supported hardware level is a high-level description of the camera device's
   5273      * capabilities, summarizing several capabilities into one field.  Each level adds additional
   5274      * features to the previous one, and is always a strict superset of the previous level.
   5275      * The ordering is <code>LEGACY &lt; LIMITED &lt; FULL &lt; LEVEL_3</code>.</p>
   5276      * <p>Starting from <code>LEVEL_3</code>, the level enumerations are guaranteed to be in increasing
   5277      * numerical value as well. To check if a given device is at least at a given hardware level,
   5278      * the following code snippet can be used:</p>
   5279      * <pre><code>// Returns true if the device supports the required hardware level, or better.
   5280      * boolean isHardwareLevelSupported(CameraCharacteristics c, int requiredLevel) {
   5281      *     final int[] sortedHwLevels = {
   5282      *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY,
   5283      *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_EXTERNAL,
   5284      *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED,
   5285      *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_FULL,
   5286      *         CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL_3
   5287      *     };
   5288      *     int deviceLevel = c.get(CameraCharacteristics.INFO_SUPPORTED_HARDWARE_LEVEL);
   5289      *     if (requiredLevel == deviceLevel) {
   5290      *         return true;
   5291      *     }
   5292      *
   5293      *     for (int sortedlevel : sortedHwLevels) {
   5294      *         if (sortedlevel == requiredLevel) {
   5295      *             return true;
   5296      *         } else if (sortedlevel == deviceLevel) {
   5297      *             return false;
   5298      *         }
   5299      *     }
   5300      *     return false; // Should never reach here
   5301      * }
   5302      * </code></pre>
   5303      * <p>At a high level, the levels are:</p>
   5304      * <ul>
   5305      * <li><code>LEGACY</code> devices operate in a backwards-compatibility mode for older
   5306      *   Android devices, and have very limited capabilities.</li>
   5307      * <li><code>LIMITED</code> devices represent the
   5308      *   baseline feature set, and may also include additional capabilities that are
   5309      *   subsets of <code>FULL</code>.</li>
   5310      * <li><code>FULL</code> devices additionally support per-frame manual control of sensor, flash, lens and
   5311      *   post-processing settings, and image capture at a high rate.</li>
   5312      * <li><code>LEVEL_3</code> devices additionally support YUV reprocessing and RAW image capture, along
   5313      *   with additional output stream configurations.</li>
   5314      * <li><code>EXTERNAL</code> devices are similar to <code>LIMITED</code> devices with exceptions like some sensor or
   5315      *   lens information not reported or less stable framerates.</li>
   5316      * </ul>
   5317      * <p>See the individual level enums for full descriptions of the supported capabilities.  The
   5318      * ACAMERA_REQUEST_AVAILABLE_CAPABILITIES entry describes the device's capabilities at a
   5319      * finer-grain level, if needed. In addition, many controls have their available settings or
   5320      * ranges defined in individual entries from {@link ACameraManager_getCameraCharacteristics }.</p>
   5321      * <p>Some features are not part of any particular hardware level or capability and must be
   5322      * queried separately. These include:</p>
   5323      * <ul>
   5324      * <li>Calibrated timestamps (ACAMERA_SENSOR_INFO_TIMESTAMP_SOURCE <code>==</code> REALTIME)</li>
   5325      * <li>Precision lens control (ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION <code>==</code> CALIBRATED)</li>
   5326      * <li>Face detection (ACAMERA_STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES)</li>
   5327      * <li>Optical or electrical image stabilization
   5328      *   (ACAMERA_LENS_INFO_AVAILABLE_OPTICAL_STABILIZATION,
   5329      *    ACAMERA_CONTROL_AVAILABLE_VIDEO_STABILIZATION_MODES)</li>
   5330      * </ul>
   5331      *
   5332      * @see ACAMERA_CONTROL_AVAILABLE_VIDEO_STABILIZATION_MODES
   5333      * @see ACAMERA_LENS_INFO_AVAILABLE_OPTICAL_STABILIZATION
   5334      * @see ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION
   5335      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   5336      * @see ACAMERA_SENSOR_INFO_TIMESTAMP_SOURCE
   5337      * @see ACAMERA_STATISTICS_INFO_AVAILABLE_FACE_DETECT_MODES
   5338      */
   5339     ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL =                     // byte (acamera_metadata_enum_android_info_supported_hardware_level_t)
   5340             ACAMERA_INFO_START,
   5341     /**
   5342      * <p>A short string for manufacturer version information about the camera device, such as
   5343      * ISP hardware, sensors, etc.</p>
   5344      *
   5345      * <p>Type: byte</p>
   5346      *
   5347      * <p>This tag may appear in:
   5348      * <ul>
   5349      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5350      * </ul></p>
   5351      *
   5352      * <p>This can be used in <a href="https://developer.android.com/reference/android/media/ExifInterface.html#TAG_IMAGE_DESCRIPTION">TAG_IMAGE_DESCRIPTION</a>
   5353      * in jpeg EXIF. This key may be absent if no version information is available on the
   5354      * device.</p>
   5355      */
   5356     ACAMERA_INFO_VERSION =                                      // byte
   5357             ACAMERA_INFO_START + 1,
   5358     ACAMERA_INFO_END,
   5359 
   5360     /**
   5361      * <p>Whether black-level compensation is locked
   5362      * to its current values, or is free to vary.</p>
   5363      *
   5364      * <p>Type: byte (acamera_metadata_enum_android_black_level_lock_t)</p>
   5365      *
   5366      * <p>This tag may appear in:
   5367      * <ul>
   5368      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5369      *   <li>ACaptureRequest</li>
   5370      * </ul></p>
   5371      *
   5372      * <p>Whether the black level offset was locked for this frame.  Should be
   5373      * ON if ACAMERA_BLACK_LEVEL_LOCK was ON in the capture request, unless
   5374      * a change in other capture settings forced the camera device to
   5375      * perform a black level reset.</p>
   5376      *
   5377      * @see ACAMERA_BLACK_LEVEL_LOCK
   5378      */
   5379     ACAMERA_BLACK_LEVEL_LOCK =                                  // byte (acamera_metadata_enum_android_black_level_lock_t)
   5380             ACAMERA_BLACK_LEVEL_START,
   5381     ACAMERA_BLACK_LEVEL_END,
   5382 
   5383     /**
   5384      * <p>The frame number corresponding to the last request
   5385      * with which the output result (metadata + buffers) has been fully
   5386      * synchronized.</p>
   5387      *
   5388      * <p>Type: int64 (acamera_metadata_enum_android_sync_frame_number_t)</p>
   5389      *
   5390      * <p>This tag may appear in:
   5391      * <ul>
   5392      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5393      * </ul></p>
   5394      *
   5395      * <p>When a request is submitted to the camera device, there is usually a
   5396      * delay of several frames before the controls get applied. A camera
   5397      * device may either choose to account for this delay by implementing a
   5398      * pipeline and carefully submit well-timed atomic control updates, or
   5399      * it may start streaming control changes that span over several frame
   5400      * boundaries.</p>
   5401      * <p>In the latter case, whenever a request's settings change relative to
   5402      * the previous submitted request, the full set of changes may take
   5403      * multiple frame durations to fully take effect. Some settings may
   5404      * take effect sooner (in less frame durations) than others.</p>
   5405      * <p>While a set of control changes are being propagated, this value
   5406      * will be CONVERGING.</p>
   5407      * <p>Once it is fully known that a set of control changes have been
   5408      * finished propagating, and the resulting updated control settings
   5409      * have been read back by the camera device, this value will be set
   5410      * to a non-negative frame number (corresponding to the request to
   5411      * which the results have synchronized to).</p>
   5412      * <p>Older camera device implementations may not have a way to detect
   5413      * when all camera controls have been applied, and will always set this
   5414      * value to UNKNOWN.</p>
   5415      * <p>FULL capability devices will always have this value set to the
   5416      * frame number of the request corresponding to this result.</p>
   5417      * <p><em>Further details</em>:</p>
   5418      * <ul>
   5419      * <li>Whenever a request differs from the last request, any future
   5420      * results not yet returned may have this value set to CONVERGING (this
   5421      * could include any in-progress captures not yet returned by the camera
   5422      * device, for more details see pipeline considerations below).</li>
   5423      * <li>Submitting a series of multiple requests that differ from the
   5424      * previous request (e.g. r1, r2, r3 s.t. r1 != r2 != r3)
   5425      * moves the new synchronization frame to the last non-repeating
   5426      * request (using the smallest frame number from the contiguous list of
   5427      * repeating requests).</li>
   5428      * <li>Submitting the same request repeatedly will not change this value
   5429      * to CONVERGING, if it was already a non-negative value.</li>
   5430      * <li>When this value changes to non-negative, that means that all of the
   5431      * metadata controls from the request have been applied, all of the
   5432      * metadata controls from the camera device have been read to the
   5433      * updated values (into the result), and all of the graphics buffers
   5434      * corresponding to this result are also synchronized to the request.</li>
   5435      * </ul>
   5436      * <p><em>Pipeline considerations</em>:</p>
   5437      * <p>Submitting a request with updated controls relative to the previously
   5438      * submitted requests may also invalidate the synchronization state
   5439      * of all the results corresponding to currently in-flight requests.</p>
   5440      * <p>In other words, results for this current request and up to
   5441      * ACAMERA_REQUEST_PIPELINE_MAX_DEPTH prior requests may have their
   5442      * ACAMERA_SYNC_FRAME_NUMBER change to CONVERGING.</p>
   5443      *
   5444      * @see ACAMERA_REQUEST_PIPELINE_MAX_DEPTH
   5445      * @see ACAMERA_SYNC_FRAME_NUMBER
   5446      */
   5447     ACAMERA_SYNC_FRAME_NUMBER =                                 // int64 (acamera_metadata_enum_android_sync_frame_number_t)
   5448             ACAMERA_SYNC_START,
   5449     /**
   5450      * <p>The maximum number of frames that can occur after a request
   5451      * (different than the previous) has been submitted, and before the
   5452      * result's state becomes synchronized.</p>
   5453      *
   5454      * <p>Type: int32 (acamera_metadata_enum_android_sync_max_latency_t)</p>
   5455      *
   5456      * <p>This tag may appear in:
   5457      * <ul>
   5458      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5459      * </ul></p>
   5460      *
   5461      * <p>This defines the maximum distance (in number of metadata results),
   5462      * between the frame number of the request that has new controls to apply
   5463      * and the frame number of the result that has all the controls applied.</p>
   5464      * <p>In other words this acts as an upper boundary for how many frames
   5465      * must occur before the camera device knows for a fact that the new
   5466      * submitted camera settings have been applied in outgoing frames.</p>
   5467      */
   5468     ACAMERA_SYNC_MAX_LATENCY =                                  // int32 (acamera_metadata_enum_android_sync_max_latency_t)
   5469             ACAMERA_SYNC_START + 1,
   5470     ACAMERA_SYNC_END,
   5471 
   5472     /**
   5473      * <p>The available depth dataspace stream
   5474      * configurations that this camera device supports
   5475      * (i.e. format, width, height, output/input stream).</p>
   5476      *
   5477      * <p>Type: int32[n*4] (acamera_metadata_enum_android_depth_available_depth_stream_configurations_t)</p>
   5478      *
   5479      * <p>This tag may appear in:
   5480      * <ul>
   5481      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5482      * </ul></p>
   5483      *
   5484      * <p>These are output stream configurations for use with
   5485      * dataSpace HAL_DATASPACE_DEPTH. The configurations are
   5486      * listed as <code>(format, width, height, input?)</code> tuples.</p>
   5487      * <p>Only devices that support depth output for at least
   5488      * the HAL_PIXEL_FORMAT_Y16 dense depth map may include
   5489      * this entry.</p>
   5490      * <p>A device that also supports the HAL_PIXEL_FORMAT_BLOB
   5491      * sparse depth point cloud must report a single entry for
   5492      * the format in this list as <code>(HAL_PIXEL_FORMAT_BLOB,
   5493      * android.depth.maxDepthSamples, 1, OUTPUT)</code> in addition to
   5494      * the entries for HAL_PIXEL_FORMAT_Y16.</p>
   5495      */
   5496     ACAMERA_DEPTH_AVAILABLE_DEPTH_STREAM_CONFIGURATIONS =       // int32[n*4] (acamera_metadata_enum_android_depth_available_depth_stream_configurations_t)
   5497             ACAMERA_DEPTH_START + 1,
   5498     /**
   5499      * <p>This lists the minimum frame duration for each
   5500      * format/size combination for depth output formats.</p>
   5501      *
   5502      * <p>Type: int64[4*n]</p>
   5503      *
   5504      * <p>This tag may appear in:
   5505      * <ul>
   5506      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5507      * </ul></p>
   5508      *
   5509      * <p>This should correspond to the frame duration when only that
   5510      * stream is active, with all processing (typically in android.*.mode)
   5511      * set to either OFF or FAST.</p>
   5512      * <p>When multiple streams are used in a request, the minimum frame
   5513      * duration will be max(individual stream min durations).</p>
   5514      * <p>The minimum frame duration of a stream (of a particular format, size)
   5515      * is the same regardless of whether the stream is input or output.</p>
   5516      * <p>See ACAMERA_SENSOR_FRAME_DURATION and
   5517      * ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS for more details about
   5518      * calculating the max frame rate.</p>
   5519      *
   5520      * @see ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS
   5521      * @see ACAMERA_SENSOR_FRAME_DURATION
   5522      */
   5523     ACAMERA_DEPTH_AVAILABLE_DEPTH_MIN_FRAME_DURATIONS =         // int64[4*n]
   5524             ACAMERA_DEPTH_START + 2,
   5525     /**
   5526      * <p>This lists the maximum stall duration for each
   5527      * output format/size combination for depth streams.</p>
   5528      *
   5529      * <p>Type: int64[4*n]</p>
   5530      *
   5531      * <p>This tag may appear in:
   5532      * <ul>
   5533      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5534      * </ul></p>
   5535      *
   5536      * <p>A stall duration is how much extra time would get added
   5537      * to the normal minimum frame duration for a repeating request
   5538      * that has streams with non-zero stall.</p>
   5539      * <p>This functions similarly to
   5540      * ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS for depth
   5541      * streams.</p>
   5542      * <p>All depth output stream formats may have a nonzero stall
   5543      * duration.</p>
   5544      *
   5545      * @see ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS
   5546      */
   5547     ACAMERA_DEPTH_AVAILABLE_DEPTH_STALL_DURATIONS =             // int64[4*n]
   5548             ACAMERA_DEPTH_START + 3,
   5549     /**
   5550      * <p>Indicates whether a capture request may target both a
   5551      * DEPTH16 / DEPTH_POINT_CLOUD output, and normal color outputs (such as
   5552      * YUV_420_888, JPEG, or RAW) simultaneously.</p>
   5553      *
   5554      * <p>Type: byte (acamera_metadata_enum_android_depth_depth_is_exclusive_t)</p>
   5555      *
   5556      * <p>This tag may appear in:
   5557      * <ul>
   5558      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5559      * </ul></p>
   5560      *
   5561      * <p>If TRUE, including both depth and color outputs in a single
   5562      * capture request is not supported. An application must interleave color
   5563      * and depth requests.  If FALSE, a single request can target both types
   5564      * of output.</p>
   5565      * <p>Typically, this restriction exists on camera devices that
   5566      * need to emit a specific pattern or wavelength of light to
   5567      * measure depth values, which causes the color image to be
   5568      * corrupted during depth measurement.</p>
   5569      */
   5570     ACAMERA_DEPTH_DEPTH_IS_EXCLUSIVE =                          // byte (acamera_metadata_enum_android_depth_depth_is_exclusive_t)
   5571             ACAMERA_DEPTH_START + 4,
   5572     /**
   5573      * <p>Recommended depth stream configurations for common client use cases.</p>
   5574      *
   5575      * <p>Type: int32[n*5]</p>
   5576      *
   5577      * <p>This tag may appear in:
   5578      * <ul>
   5579      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5580      * </ul></p>
   5581      *
   5582      * <p>Optional subset of the ACAMERA_DEPTH_AVAILABLE_DEPTH_STREAM_CONFIGURATIONS that
   5583      * contains similar tuples listed as
   5584      * (i.e. width, height, format, output/input stream, usecase bit field).
   5585      * Camera devices will be able to suggest particular depth stream configurations which are
   5586      * power and performance efficient for specific use cases. For more information about
   5587      * retrieving the suggestions see
   5588      * <a href="https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html#getRecommendedStreamConfigurationMap">CameraCharacteristics#getRecommendedStreamConfigurationMap</a>.</p>
   5589      * <p>For data representation please refer to
   5590      * ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS</p>
   5591      *
   5592      * @see ACAMERA_DEPTH_AVAILABLE_DEPTH_STREAM_CONFIGURATIONS
   5593      * @see ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS
   5594      */
   5595     ACAMERA_DEPTH_AVAILABLE_RECOMMENDED_DEPTH_STREAM_CONFIGURATIONS =
   5596                                                                 // int32[n*5]
   5597             ACAMERA_DEPTH_START + 5,
   5598     /**
   5599      * <p>The available dynamic depth dataspace stream
   5600      * configurations that this camera device supports
   5601      * (i.e. format, width, height, output/input stream).</p>
   5602      *
   5603      * <p>Type: int32[n*4] (acamera_metadata_enum_android_depth_available_dynamic_depth_stream_configurations_t)</p>
   5604      *
   5605      * <p>This tag may appear in:
   5606      * <ul>
   5607      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5608      * </ul></p>
   5609      *
   5610      * <p>These are output stream configurations for use with
   5611      * dataSpace DYNAMIC_DEPTH. The configurations are
   5612      * listed as <code>(format, width, height, input?)</code> tuples.</p>
   5613      * <p>Only devices that support depth output for at least
   5614      * the HAL_PIXEL_FORMAT_Y16 dense depth map along with
   5615      * HAL_PIXEL_FORMAT_BLOB with the same size or size with
   5616      * the same aspect ratio can have dynamic depth dataspace
   5617      * stream configuration. ACAMERA_DEPTH_DEPTH_IS_EXCLUSIVE also
   5618      * needs to be set to FALSE.</p>
   5619      *
   5620      * @see ACAMERA_DEPTH_DEPTH_IS_EXCLUSIVE
   5621      */
   5622     ACAMERA_DEPTH_AVAILABLE_DYNAMIC_DEPTH_STREAM_CONFIGURATIONS =
   5623                                                                 // int32[n*4] (acamera_metadata_enum_android_depth_available_dynamic_depth_stream_configurations_t)
   5624             ACAMERA_DEPTH_START + 6,
   5625     /**
   5626      * <p>This lists the minimum frame duration for each
   5627      * format/size combination for dynamic depth output streams.</p>
   5628      *
   5629      * <p>Type: int64[4*n]</p>
   5630      *
   5631      * <p>This tag may appear in:
   5632      * <ul>
   5633      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5634      * </ul></p>
   5635      *
   5636      * <p>This should correspond to the frame duration when only that
   5637      * stream is active, with all processing (typically in android.*.mode)
   5638      * set to either OFF or FAST.</p>
   5639      * <p>When multiple streams are used in a request, the minimum frame
   5640      * duration will be max(individual stream min durations).</p>
   5641      * <p>The minimum frame duration of a stream (of a particular format, size)
   5642      * is the same regardless of whether the stream is input or output.</p>
   5643      */
   5644     ACAMERA_DEPTH_AVAILABLE_DYNAMIC_DEPTH_MIN_FRAME_DURATIONS = // int64[4*n]
   5645             ACAMERA_DEPTH_START + 7,
   5646     /**
   5647      * <p>This lists the maximum stall duration for each
   5648      * output format/size combination for dynamic depth streams.</p>
   5649      *
   5650      * <p>Type: int64[4*n]</p>
   5651      *
   5652      * <p>This tag may appear in:
   5653      * <ul>
   5654      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5655      * </ul></p>
   5656      *
   5657      * <p>A stall duration is how much extra time would get added
   5658      * to the normal minimum frame duration for a repeating request
   5659      * that has streams with non-zero stall.</p>
   5660      * <p>All dynamic depth output streams may have a nonzero stall
   5661      * duration.</p>
   5662      */
   5663     ACAMERA_DEPTH_AVAILABLE_DYNAMIC_DEPTH_STALL_DURATIONS =     // int64[4*n]
   5664             ACAMERA_DEPTH_START + 8,
   5665     ACAMERA_DEPTH_END,
   5666 
   5667     /**
   5668      * <p>String containing the ids of the underlying physical cameras.</p>
   5669      *
   5670      * <p>Type: byte[n]</p>
   5671      *
   5672      * <p>This tag may appear in:
   5673      * <ul>
   5674      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5675      * </ul></p>
   5676      *
   5677      * <p>For a logical camera, this is concatenation of all underlying physical camera IDs.
   5678      * The null terminator for physical camera ID must be preserved so that the whole string
   5679      * can be tokenized using '\0' to generate list of physical camera IDs.</p>
   5680      * <p>For example, if the physical camera IDs of the logical camera are "2" and "3", the
   5681      * value of this tag will be ['2', '\0', '3', '\0'].</p>
   5682      * <p>The number of physical camera IDs must be no less than 2.</p>
   5683      */
   5684     ACAMERA_LOGICAL_MULTI_CAMERA_PHYSICAL_IDS =                 // byte[n]
   5685             ACAMERA_LOGICAL_MULTI_CAMERA_START,
   5686     /**
   5687      * <p>The accuracy of frame timestamp synchronization between physical cameras</p>
   5688      *
   5689      * <p>Type: byte (acamera_metadata_enum_android_logical_multi_camera_sensor_sync_type_t)</p>
   5690      *
   5691      * <p>This tag may appear in:
   5692      * <ul>
   5693      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5694      * </ul></p>
   5695      *
   5696      * <p>The accuracy of the frame timestamp synchronization determines the physical cameras'
   5697      * ability to start exposure at the same time. If the sensorSyncType is CALIBRATED,
   5698      * the physical camera sensors usually run in master-slave mode so that their shutter
   5699      * time is synchronized. For APPROXIMATE sensorSyncType, the camera sensors usually run in
   5700      * master-master mode, and there could be offset between their start of exposure.</p>
   5701      * <p>In both cases, all images generated for a particular capture request still carry the same
   5702      * timestamps, so that they can be used to look up the matching frame number and
   5703      * onCaptureStarted callback.</p>
   5704      * <p>This tag is only applicable if the logical camera device supports concurrent physical
   5705      * streams from different physical cameras.</p>
   5706      */
   5707     ACAMERA_LOGICAL_MULTI_CAMERA_SENSOR_SYNC_TYPE =             // byte (acamera_metadata_enum_android_logical_multi_camera_sensor_sync_type_t)
   5708             ACAMERA_LOGICAL_MULTI_CAMERA_START + 1,
   5709     /**
   5710      * <p>String containing the ID of the underlying active physical camera.</p>
   5711      *
   5712      * <p>Type: byte</p>
   5713      *
   5714      * <p>This tag may appear in:
   5715      * <ul>
   5716      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5717      * </ul></p>
   5718      *
   5719      * <p>The ID of the active physical camera that's backing the logical camera. All camera
   5720      * streams and metadata that are not physical camera specific will be originating from this
   5721      * physical camera.</p>
   5722      * <p>For a logical camera made up of physical cameras where each camera's lenses have
   5723      * different characteristics, the camera device may choose to switch between the physical
   5724      * cameras when application changes FOCAL_LENGTH or SCALER_CROP_REGION.
   5725      * At the time of lens switch, this result metadata reflects the new active physical camera
   5726      * ID.</p>
   5727      * <p>This key will be available if the camera device advertises this key via {@link ACAMERA_REQUEST_AVAILABLE_RESULT_KEYS }.
   5728      * When available, this must be one of valid physical IDs backing this logical multi-camera.
   5729      * If this key is not available for a logical multi-camera, the camera device implementation
   5730      * may still switch between different active physical cameras based on use case, but the
   5731      * current active physical camera information won't be available to the application.</p>
   5732      */
   5733     ACAMERA_LOGICAL_MULTI_CAMERA_ACTIVE_PHYSICAL_ID =           // byte
   5734             ACAMERA_LOGICAL_MULTI_CAMERA_START + 2,
   5735     ACAMERA_LOGICAL_MULTI_CAMERA_END,
   5736 
   5737     /**
   5738      * <p>Mode of operation for the lens distortion correction block.</p>
   5739      *
   5740      * <p>Type: byte (acamera_metadata_enum_android_distortion_correction_mode_t)</p>
   5741      *
   5742      * <p>This tag may appear in:
   5743      * <ul>
   5744      *   <li>ACameraMetadata from ACameraCaptureSession_captureCallback_result callbacks</li>
   5745      *   <li>ACaptureRequest</li>
   5746      * </ul></p>
   5747      *
   5748      * <p>The lens distortion correction block attempts to improve image quality by fixing
   5749      * radial, tangential, or other geometric aberrations in the camera device's optics.  If
   5750      * available, the ACAMERA_LENS_DISTORTION field documents the lens's distortion parameters.</p>
   5751      * <p>OFF means no distortion correction is done.</p>
   5752      * <p>FAST/HIGH_QUALITY both mean camera device determined distortion correction will be
   5753      * applied. HIGH_QUALITY mode indicates that the camera device will use the highest-quality
   5754      * correction algorithms, even if it slows down capture rate. FAST means the camera device
   5755      * will not slow down capture rate when applying correction. FAST may be the same as OFF if
   5756      * any correction at all would slow down capture rate.  Every output stream will have a
   5757      * similar amount of enhancement applied.</p>
   5758      * <p>The correction only applies to processed outputs such as YUV, Y8, JPEG, or DEPTH16; it is
   5759      * not applied to any RAW output.</p>
   5760      * <p>This control will be on by default on devices that support this control. Applications
   5761      * disabling distortion correction need to pay extra attention with the coordinate system of
   5762      * metering regions, crop region, and face rectangles. When distortion correction is OFF,
   5763      * metadata coordinates follow the coordinate system of
   5764      * ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE. When distortion is not OFF, metadata
   5765      * coordinates follow the coordinate system of ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE.  The
   5766      * camera device will map these metadata fields to match the corrected image produced by the
   5767      * camera device, for both capture requests and results.  However, this mapping is not very
   5768      * precise, since rectangles do not generally map to rectangles when corrected.  Only linear
   5769      * scaling between the active array and precorrection active array coordinates is
   5770      * performed. Applications that require precise correction of metadata need to undo that
   5771      * linear scaling, and apply a more complete correction that takes into the account the app's
   5772      * own requirements.</p>
   5773      * <p>The full list of metadata that is affected in this way by distortion correction is:</p>
   5774      * <ul>
   5775      * <li>ACAMERA_CONTROL_AF_REGIONS</li>
   5776      * <li>ACAMERA_CONTROL_AE_REGIONS</li>
   5777      * <li>ACAMERA_CONTROL_AWB_REGIONS</li>
   5778      * <li>ACAMERA_SCALER_CROP_REGION</li>
   5779      * <li>android.statistics.faces</li>
   5780      * </ul>
   5781      *
   5782      * @see ACAMERA_CONTROL_AE_REGIONS
   5783      * @see ACAMERA_CONTROL_AF_REGIONS
   5784      * @see ACAMERA_CONTROL_AWB_REGIONS
   5785      * @see ACAMERA_LENS_DISTORTION
   5786      * @see ACAMERA_SCALER_CROP_REGION
   5787      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   5788      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
   5789      */
   5790     ACAMERA_DISTORTION_CORRECTION_MODE =                        // byte (acamera_metadata_enum_android_distortion_correction_mode_t)
   5791             ACAMERA_DISTORTION_CORRECTION_START,
   5792     /**
   5793      * <p>List of distortion correction modes for ACAMERA_DISTORTION_CORRECTION_MODE that are
   5794      * supported by this camera device.</p>
   5795      *
   5796      * @see ACAMERA_DISTORTION_CORRECTION_MODE
   5797      *
   5798      * <p>Type: byte[n]</p>
   5799      *
   5800      * <p>This tag may appear in:
   5801      * <ul>
   5802      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5803      * </ul></p>
   5804      *
   5805      * <p>No device is required to support this API; such devices will always list only 'OFF'.
   5806      * All devices that support this API will list both FAST and HIGH_QUALITY.</p>
   5807      */
   5808     ACAMERA_DISTORTION_CORRECTION_AVAILABLE_MODES =             // byte[n]
   5809             ACAMERA_DISTORTION_CORRECTION_START + 1,
   5810     ACAMERA_DISTORTION_CORRECTION_END,
   5811 
   5812     /**
   5813      * <p>The available HEIC (ISO/IEC 23008-12) stream
   5814      * configurations that this camera device supports
   5815      * (i.e. format, width, height, output/input stream).</p>
   5816      *
   5817      * <p>Type: int32[n*4] (acamera_metadata_enum_android_heic_available_heic_stream_configurations_t)</p>
   5818      *
   5819      * <p>This tag may appear in:
   5820      * <ul>
   5821      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5822      * </ul></p>
   5823      *
   5824      * <p>The configurations are listed as <code>(format, width, height, input?)</code> tuples.</p>
   5825      * <p>If the camera device supports HEIC image format, it will support identical set of stream
   5826      * combinations involving HEIC image format, compared to the combinations involving JPEG
   5827      * image format as required by the device's hardware level and capabilities.</p>
   5828      * <p>All the static, control, and dynamic metadata tags related to JPEG apply to HEIC formats.
   5829      * Configuring JPEG and HEIC streams at the same time is not supported.</p>
   5830      * <p>All the configuration tuples <code>(format, width, height, input?)</code> will contain
   5831      * AIMAGE_FORMAT_HEIC format as OUTPUT only.</p>
   5832      */
   5833     ACAMERA_HEIC_AVAILABLE_HEIC_STREAM_CONFIGURATIONS =         // int32[n*4] (acamera_metadata_enum_android_heic_available_heic_stream_configurations_t)
   5834             ACAMERA_HEIC_START,
   5835     /**
   5836      * <p>This lists the minimum frame duration for each
   5837      * format/size combination for HEIC output formats.</p>
   5838      *
   5839      * <p>Type: int64[4*n]</p>
   5840      *
   5841      * <p>This tag may appear in:
   5842      * <ul>
   5843      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5844      * </ul></p>
   5845      *
   5846      * <p>This should correspond to the frame duration when only that
   5847      * stream is active, with all processing (typically in android.*.mode)
   5848      * set to either OFF or FAST.</p>
   5849      * <p>When multiple streams are used in a request, the minimum frame
   5850      * duration will be max(individual stream min durations).</p>
   5851      * <p>See ACAMERA_SENSOR_FRAME_DURATION and
   5852      * ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS for more details about
   5853      * calculating the max frame rate.</p>
   5854      *
   5855      * @see ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS
   5856      * @see ACAMERA_SENSOR_FRAME_DURATION
   5857      */
   5858     ACAMERA_HEIC_AVAILABLE_HEIC_MIN_FRAME_DURATIONS =           // int64[4*n]
   5859             ACAMERA_HEIC_START + 1,
   5860     /**
   5861      * <p>This lists the maximum stall duration for each
   5862      * output format/size combination for HEIC streams.</p>
   5863      *
   5864      * <p>Type: int64[4*n]</p>
   5865      *
   5866      * <p>This tag may appear in:
   5867      * <ul>
   5868      *   <li>ACameraMetadata from ACameraManager_getCameraCharacteristics</li>
   5869      * </ul></p>
   5870      *
   5871      * <p>A stall duration is how much extra time would get added
   5872      * to the normal minimum frame duration for a repeating request
   5873      * that has streams with non-zero stall.</p>
   5874      * <p>This functions similarly to
   5875      * ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS for HEIC
   5876      * streams.</p>
   5877      * <p>All HEIC output stream formats may have a nonzero stall
   5878      * duration.</p>
   5879      *
   5880      * @see ACAMERA_SCALER_AVAILABLE_STALL_DURATIONS
   5881      */
   5882     ACAMERA_HEIC_AVAILABLE_HEIC_STALL_DURATIONS =               // int64[4*n]
   5883             ACAMERA_HEIC_START + 2,
   5884     ACAMERA_HEIC_END,
   5885 
   5886 } acamera_metadata_tag_t;
   5887 
   5888 /**
   5889  * Enumeration definitions for the various entries that need them
   5890  */
   5891 
   5892 // ACAMERA_COLOR_CORRECTION_MODE
   5893 typedef enum acamera_metadata_enum_acamera_color_correction_mode {
   5894     /**
   5895      * <p>Use the ACAMERA_COLOR_CORRECTION_TRANSFORM matrix
   5896      * and ACAMERA_COLOR_CORRECTION_GAINS to do color conversion.</p>
   5897      * <p>All advanced white balance adjustments (not specified
   5898      * by our white balance pipeline) must be disabled.</p>
   5899      * <p>If AWB is enabled with <code>ACAMERA_CONTROL_AWB_MODE != OFF</code>, then
   5900      * TRANSFORM_MATRIX is ignored. The camera device will override
   5901      * this value to either FAST or HIGH_QUALITY.</p>
   5902      *
   5903      * @see ACAMERA_COLOR_CORRECTION_GAINS
   5904      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   5905      * @see ACAMERA_CONTROL_AWB_MODE
   5906      */
   5907     ACAMERA_COLOR_CORRECTION_MODE_TRANSFORM_MATRIX                   = 0,
   5908 
   5909     /**
   5910      * <p>Color correction processing must not slow down
   5911      * capture rate relative to sensor raw output.</p>
   5912      * <p>Advanced white balance adjustments above and beyond
   5913      * the specified white balance pipeline may be applied.</p>
   5914      * <p>If AWB is enabled with <code>ACAMERA_CONTROL_AWB_MODE != OFF</code>, then
   5915      * the camera device uses the last frame's AWB values
   5916      * (or defaults if AWB has never been run).</p>
   5917      *
   5918      * @see ACAMERA_CONTROL_AWB_MODE
   5919      */
   5920     ACAMERA_COLOR_CORRECTION_MODE_FAST                               = 1,
   5921 
   5922     /**
   5923      * <p>Color correction processing operates at improved
   5924      * quality but the capture rate might be reduced (relative to sensor
   5925      * raw output rate)</p>
   5926      * <p>Advanced white balance adjustments above and beyond
   5927      * the specified white balance pipeline may be applied.</p>
   5928      * <p>If AWB is enabled with <code>ACAMERA_CONTROL_AWB_MODE != OFF</code>, then
   5929      * the camera device uses the last frame's AWB values
   5930      * (or defaults if AWB has never been run).</p>
   5931      *
   5932      * @see ACAMERA_CONTROL_AWB_MODE
   5933      */
   5934     ACAMERA_COLOR_CORRECTION_MODE_HIGH_QUALITY                       = 2,
   5935 
   5936 } acamera_metadata_enum_android_color_correction_mode_t;
   5937 
   5938 // ACAMERA_COLOR_CORRECTION_ABERRATION_MODE
   5939 typedef enum acamera_metadata_enum_acamera_color_correction_aberration_mode {
   5940     /**
   5941      * <p>No aberration correction is applied.</p>
   5942      */
   5943     ACAMERA_COLOR_CORRECTION_ABERRATION_MODE_OFF                     = 0,
   5944 
   5945     /**
   5946      * <p>Aberration correction will not slow down capture rate
   5947      * relative to sensor raw output.</p>
   5948      */
   5949     ACAMERA_COLOR_CORRECTION_ABERRATION_MODE_FAST                    = 1,
   5950 
   5951     /**
   5952      * <p>Aberration correction operates at improved quality but the capture rate might be
   5953      * reduced (relative to sensor raw output rate)</p>
   5954      */
   5955     ACAMERA_COLOR_CORRECTION_ABERRATION_MODE_HIGH_QUALITY            = 2,
   5956 
   5957 } acamera_metadata_enum_android_color_correction_aberration_mode_t;
   5958 
   5959 
   5960 // ACAMERA_CONTROL_AE_ANTIBANDING_MODE
   5961 typedef enum acamera_metadata_enum_acamera_control_ae_antibanding_mode {
   5962     /**
   5963      * <p>The camera device will not adjust exposure duration to
   5964      * avoid banding problems.</p>
   5965      */
   5966     ACAMERA_CONTROL_AE_ANTIBANDING_MODE_OFF                          = 0,
   5967 
   5968     /**
   5969      * <p>The camera device will adjust exposure duration to
   5970      * avoid banding problems with 50Hz illumination sources.</p>
   5971      */
   5972     ACAMERA_CONTROL_AE_ANTIBANDING_MODE_50HZ                         = 1,
   5973 
   5974     /**
   5975      * <p>The camera device will adjust exposure duration to
   5976      * avoid banding problems with 60Hz illumination
   5977      * sources.</p>
   5978      */
   5979     ACAMERA_CONTROL_AE_ANTIBANDING_MODE_60HZ                         = 2,
   5980 
   5981     /**
   5982      * <p>The camera device will automatically adapt its
   5983      * antibanding routine to the current illumination
   5984      * condition. This is the default mode if AUTO is
   5985      * available on given camera device.</p>
   5986      */
   5987     ACAMERA_CONTROL_AE_ANTIBANDING_MODE_AUTO                         = 3,
   5988 
   5989 } acamera_metadata_enum_android_control_ae_antibanding_mode_t;
   5990 
   5991 // ACAMERA_CONTROL_AE_LOCK
   5992 typedef enum acamera_metadata_enum_acamera_control_ae_lock {
   5993     /**
   5994      * <p>Auto-exposure lock is disabled; the AE algorithm
   5995      * is free to update its parameters.</p>
   5996      */
   5997     ACAMERA_CONTROL_AE_LOCK_OFF                                      = 0,
   5998 
   5999     /**
   6000      * <p>Auto-exposure lock is enabled; the AE algorithm
   6001      * must not update the exposure and sensitivity parameters
   6002      * while the lock is active.</p>
   6003      * <p>ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION setting changes
   6004      * will still take effect while auto-exposure is locked.</p>
   6005      * <p>Some rare LEGACY devices may not support
   6006      * this, in which case the value will always be overridden to OFF.</p>
   6007      *
   6008      * @see ACAMERA_CONTROL_AE_EXPOSURE_COMPENSATION
   6009      */
   6010     ACAMERA_CONTROL_AE_LOCK_ON                                       = 1,
   6011 
   6012 } acamera_metadata_enum_android_control_ae_lock_t;
   6013 
   6014 // ACAMERA_CONTROL_AE_MODE
   6015 typedef enum acamera_metadata_enum_acamera_control_ae_mode {
   6016     /**
   6017      * <p>The camera device's autoexposure routine is disabled.</p>
   6018      * <p>The application-selected ACAMERA_SENSOR_EXPOSURE_TIME,
   6019      * ACAMERA_SENSOR_SENSITIVITY and
   6020      * ACAMERA_SENSOR_FRAME_DURATION are used by the camera
   6021      * device, along with ACAMERA_FLASH_* fields, if there's
   6022      * a flash unit for this camera device.</p>
   6023      * <p>Note that auto-white balance (AWB) and auto-focus (AF)
   6024      * behavior is device dependent when AE is in OFF mode.
   6025      * To have consistent behavior across different devices,
   6026      * it is recommended to either set AWB and AF to OFF mode
   6027      * or lock AWB and AF before setting AE to OFF.
   6028      * See ACAMERA_CONTROL_AWB_MODE, ACAMERA_CONTROL_AF_MODE,
   6029      * ACAMERA_CONTROL_AWB_LOCK, and ACAMERA_CONTROL_AF_TRIGGER
   6030      * for more details.</p>
   6031      * <p>LEGACY devices do not support the OFF mode and will
   6032      * override attempts to use this value to ON.</p>
   6033      *
   6034      * @see ACAMERA_CONTROL_AF_MODE
   6035      * @see ACAMERA_CONTROL_AF_TRIGGER
   6036      * @see ACAMERA_CONTROL_AWB_LOCK
   6037      * @see ACAMERA_CONTROL_AWB_MODE
   6038      * @see ACAMERA_SENSOR_EXPOSURE_TIME
   6039      * @see ACAMERA_SENSOR_FRAME_DURATION
   6040      * @see ACAMERA_SENSOR_SENSITIVITY
   6041      */
   6042     ACAMERA_CONTROL_AE_MODE_OFF                                      = 0,
   6043 
   6044     /**
   6045      * <p>The camera device's autoexposure routine is active,
   6046      * with no flash control.</p>
   6047      * <p>The application's values for
   6048      * ACAMERA_SENSOR_EXPOSURE_TIME,
   6049      * ACAMERA_SENSOR_SENSITIVITY, and
   6050      * ACAMERA_SENSOR_FRAME_DURATION are ignored. The
   6051      * application has control over the various
   6052      * ACAMERA_FLASH_* fields.</p>
   6053      *
   6054      * @see ACAMERA_SENSOR_EXPOSURE_TIME
   6055      * @see ACAMERA_SENSOR_FRAME_DURATION
   6056      * @see ACAMERA_SENSOR_SENSITIVITY
   6057      */
   6058     ACAMERA_CONTROL_AE_MODE_ON                                       = 1,
   6059 
   6060     /**
   6061      * <p>Like ON, except that the camera device also controls
   6062      * the camera's flash unit, firing it in low-light
   6063      * conditions.</p>
   6064      * <p>The flash may be fired during a precapture sequence
   6065      * (triggered by ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER) and
   6066      * may be fired for captures for which the
   6067      * ACAMERA_CONTROL_CAPTURE_INTENT field is set to
   6068      * STILL_CAPTURE</p>
   6069      *
   6070      * @see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
   6071      * @see ACAMERA_CONTROL_CAPTURE_INTENT
   6072      */
   6073     ACAMERA_CONTROL_AE_MODE_ON_AUTO_FLASH                            = 2,
   6074 
   6075     /**
   6076      * <p>Like ON, except that the camera device also controls
   6077      * the camera's flash unit, always firing it for still
   6078      * captures.</p>
   6079      * <p>The flash may be fired during a precapture sequence
   6080      * (triggered by ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER) and
   6081      * will always be fired for captures for which the
   6082      * ACAMERA_CONTROL_CAPTURE_INTENT field is set to
   6083      * STILL_CAPTURE</p>
   6084      *
   6085      * @see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
   6086      * @see ACAMERA_CONTROL_CAPTURE_INTENT
   6087      */
   6088     ACAMERA_CONTROL_AE_MODE_ON_ALWAYS_FLASH                          = 3,
   6089 
   6090     /**
   6091      * <p>Like ON_AUTO_FLASH, but with automatic red eye
   6092      * reduction.</p>
   6093      * <p>If deemed necessary by the camera device, a red eye
   6094      * reduction flash will fire during the precapture
   6095      * sequence.</p>
   6096      */
   6097     ACAMERA_CONTROL_AE_MODE_ON_AUTO_FLASH_REDEYE                     = 4,
   6098 
   6099     /**
   6100      * <p>An external flash has been turned on.</p>
   6101      * <p>It informs the camera device that an external flash has been turned on, and that
   6102      * metering (and continuous focus if active) should be quickly recaculated to account
   6103      * for the external flash. Otherwise, this mode acts like ON.</p>
   6104      * <p>When the external flash is turned off, AE mode should be changed to one of the
   6105      * other available AE modes.</p>
   6106      * <p>If the camera device supports AE external flash mode, ACAMERA_CONTROL_AE_STATE must
   6107      * be FLASH_REQUIRED after the camera device finishes AE scan and it's too dark without
   6108      * flash.</p>
   6109      *
   6110      * @see ACAMERA_CONTROL_AE_STATE
   6111      */
   6112     ACAMERA_CONTROL_AE_MODE_ON_EXTERNAL_FLASH                        = 5,
   6113 
   6114 } acamera_metadata_enum_android_control_ae_mode_t;
   6115 
   6116 // ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
   6117 typedef enum acamera_metadata_enum_acamera_control_ae_precapture_trigger {
   6118     /**
   6119      * <p>The trigger is idle.</p>
   6120      */
   6121     ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER_IDLE                       = 0,
   6122 
   6123     /**
   6124      * <p>The precapture metering sequence will be started
   6125      * by the camera device.</p>
   6126      * <p>The exact effect of the precapture trigger depends on
   6127      * the current AE mode and state.</p>
   6128      */
   6129     ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER_START                      = 1,
   6130 
   6131     /**
   6132      * <p>The camera device will cancel any currently active or completed
   6133      * precapture metering sequence, the auto-exposure routine will return to its
   6134      * initial state.</p>
   6135      */
   6136     ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER_CANCEL                     = 2,
   6137 
   6138 } acamera_metadata_enum_android_control_ae_precapture_trigger_t;
   6139 
   6140 // ACAMERA_CONTROL_AF_MODE
   6141 typedef enum acamera_metadata_enum_acamera_control_af_mode {
   6142     /**
   6143      * <p>The auto-focus routine does not control the lens;
   6144      * ACAMERA_LENS_FOCUS_DISTANCE is controlled by the
   6145      * application.</p>
   6146      *
   6147      * @see ACAMERA_LENS_FOCUS_DISTANCE
   6148      */
   6149     ACAMERA_CONTROL_AF_MODE_OFF                                      = 0,
   6150 
   6151     /**
   6152      * <p>Basic automatic focus mode.</p>
   6153      * <p>In this mode, the lens does not move unless
   6154      * the autofocus trigger action is called. When that trigger
   6155      * is activated, AF will transition to ACTIVE_SCAN, then to
   6156      * the outcome of the scan (FOCUSED or NOT_FOCUSED).</p>
   6157      * <p>Always supported if lens is not fixed focus.</p>
   6158      * <p>Use ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE to determine if lens
   6159      * is fixed-focus.</p>
   6160      * <p>Triggering AF_CANCEL resets the lens position to default,
   6161      * and sets the AF state to INACTIVE.</p>
   6162      *
   6163      * @see ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE
   6164      */
   6165     ACAMERA_CONTROL_AF_MODE_AUTO                                     = 1,
   6166 
   6167     /**
   6168      * <p>Close-up focusing mode.</p>
   6169      * <p>In this mode, the lens does not move unless the
   6170      * autofocus trigger action is called. When that trigger is
   6171      * activated, AF will transition to ACTIVE_SCAN, then to
   6172      * the outcome of the scan (FOCUSED or NOT_FOCUSED). This
   6173      * mode is optimized for focusing on objects very close to
   6174      * the camera.</p>
   6175      * <p>When that trigger is activated, AF will transition to
   6176      * ACTIVE_SCAN, then to the outcome of the scan (FOCUSED or
   6177      * NOT_FOCUSED). Triggering cancel AF resets the lens
   6178      * position to default, and sets the AF state to
   6179      * INACTIVE.</p>
   6180      */
   6181     ACAMERA_CONTROL_AF_MODE_MACRO                                    = 2,
   6182 
   6183     /**
   6184      * <p>In this mode, the AF algorithm modifies the lens
   6185      * position continually to attempt to provide a
   6186      * constantly-in-focus image stream.</p>
   6187      * <p>The focusing behavior should be suitable for good quality
   6188      * video recording; typically this means slower focus
   6189      * movement and no overshoots. When the AF trigger is not
   6190      * involved, the AF algorithm should start in INACTIVE state,
   6191      * and then transition into PASSIVE_SCAN and PASSIVE_FOCUSED
   6192      * states as appropriate. When the AF trigger is activated,
   6193      * the algorithm should immediately transition into
   6194      * AF_FOCUSED or AF_NOT_FOCUSED as appropriate, and lock the
   6195      * lens position until a cancel AF trigger is received.</p>
   6196      * <p>Once cancel is received, the algorithm should transition
   6197      * back to INACTIVE and resume passive scan. Note that this
   6198      * behavior is not identical to CONTINUOUS_PICTURE, since an
   6199      * ongoing PASSIVE_SCAN must immediately be
   6200      * canceled.</p>
   6201      */
   6202     ACAMERA_CONTROL_AF_MODE_CONTINUOUS_VIDEO                         = 3,
   6203 
   6204     /**
   6205      * <p>In this mode, the AF algorithm modifies the lens
   6206      * position continually to attempt to provide a
   6207      * constantly-in-focus image stream.</p>
   6208      * <p>The focusing behavior should be suitable for still image
   6209      * capture; typically this means focusing as fast as
   6210      * possible. When the AF trigger is not involved, the AF
   6211      * algorithm should start in INACTIVE state, and then
   6212      * transition into PASSIVE_SCAN and PASSIVE_FOCUSED states as
   6213      * appropriate as it attempts to maintain focus. When the AF
   6214      * trigger is activated, the algorithm should finish its
   6215      * PASSIVE_SCAN if active, and then transition into
   6216      * AF_FOCUSED or AF_NOT_FOCUSED as appropriate, and lock the
   6217      * lens position until a cancel AF trigger is received.</p>
   6218      * <p>When the AF cancel trigger is activated, the algorithm
   6219      * should transition back to INACTIVE and then act as if it
   6220      * has just been started.</p>
   6221      */
   6222     ACAMERA_CONTROL_AF_MODE_CONTINUOUS_PICTURE                       = 4,
   6223 
   6224     /**
   6225      * <p>Extended depth of field (digital focus) mode.</p>
   6226      * <p>The camera device will produce images with an extended
   6227      * depth of field automatically; no special focusing
   6228      * operations need to be done before taking a picture.</p>
   6229      * <p>AF triggers are ignored, and the AF state will always be
   6230      * INACTIVE.</p>
   6231      */
   6232     ACAMERA_CONTROL_AF_MODE_EDOF                                     = 5,
   6233 
   6234 } acamera_metadata_enum_android_control_af_mode_t;
   6235 
   6236 // ACAMERA_CONTROL_AF_TRIGGER
   6237 typedef enum acamera_metadata_enum_acamera_control_af_trigger {
   6238     /**
   6239      * <p>The trigger is idle.</p>
   6240      */
   6241     ACAMERA_CONTROL_AF_TRIGGER_IDLE                                  = 0,
   6242 
   6243     /**
   6244      * <p>Autofocus will trigger now.</p>
   6245      */
   6246     ACAMERA_CONTROL_AF_TRIGGER_START                                 = 1,
   6247 
   6248     /**
   6249      * <p>Autofocus will return to its initial
   6250      * state, and cancel any currently active trigger.</p>
   6251      */
   6252     ACAMERA_CONTROL_AF_TRIGGER_CANCEL                                = 2,
   6253 
   6254 } acamera_metadata_enum_android_control_af_trigger_t;
   6255 
   6256 // ACAMERA_CONTROL_AWB_LOCK
   6257 typedef enum acamera_metadata_enum_acamera_control_awb_lock {
   6258     /**
   6259      * <p>Auto-white balance lock is disabled; the AWB
   6260      * algorithm is free to update its parameters if in AUTO
   6261      * mode.</p>
   6262      */
   6263     ACAMERA_CONTROL_AWB_LOCK_OFF                                     = 0,
   6264 
   6265     /**
   6266      * <p>Auto-white balance lock is enabled; the AWB
   6267      * algorithm will not update its parameters while the lock
   6268      * is active.</p>
   6269      */
   6270     ACAMERA_CONTROL_AWB_LOCK_ON                                      = 1,
   6271 
   6272 } acamera_metadata_enum_android_control_awb_lock_t;
   6273 
   6274 // ACAMERA_CONTROL_AWB_MODE
   6275 typedef enum acamera_metadata_enum_acamera_control_awb_mode {
   6276     /**
   6277      * <p>The camera device's auto-white balance routine is disabled.</p>
   6278      * <p>The application-selected color transform matrix
   6279      * (ACAMERA_COLOR_CORRECTION_TRANSFORM) and gains
   6280      * (ACAMERA_COLOR_CORRECTION_GAINS) are used by the camera
   6281      * device for manual white balance control.</p>
   6282      *
   6283      * @see ACAMERA_COLOR_CORRECTION_GAINS
   6284      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   6285      */
   6286     ACAMERA_CONTROL_AWB_MODE_OFF                                     = 0,
   6287 
   6288     /**
   6289      * <p>The camera device's auto-white balance routine is active.</p>
   6290      * <p>The application's values for ACAMERA_COLOR_CORRECTION_TRANSFORM
   6291      * and ACAMERA_COLOR_CORRECTION_GAINS are ignored.
   6292      * For devices that support the MANUAL_POST_PROCESSING capability, the
   6293      * values used by the camera device for the transform and gains
   6294      * will be available in the capture result for this request.</p>
   6295      *
   6296      * @see ACAMERA_COLOR_CORRECTION_GAINS
   6297      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   6298      */
   6299     ACAMERA_CONTROL_AWB_MODE_AUTO                                    = 1,
   6300 
   6301     /**
   6302      * <p>The camera device's auto-white balance routine is disabled;
   6303      * the camera device uses incandescent light as the assumed scene
   6304      * illumination for white balance.</p>
   6305      * <p>While the exact white balance transforms are up to the
   6306      * camera device, they will approximately match the CIE
   6307      * standard illuminant A.</p>
   6308      * <p>The application's values for ACAMERA_COLOR_CORRECTION_TRANSFORM
   6309      * and ACAMERA_COLOR_CORRECTION_GAINS are ignored.
   6310      * For devices that support the MANUAL_POST_PROCESSING capability, the
   6311      * values used by the camera device for the transform and gains
   6312      * will be available in the capture result for this request.</p>
   6313      *
   6314      * @see ACAMERA_COLOR_CORRECTION_GAINS
   6315      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   6316      */
   6317     ACAMERA_CONTROL_AWB_MODE_INCANDESCENT                            = 2,
   6318 
   6319     /**
   6320      * <p>The camera device's auto-white balance routine is disabled;
   6321      * the camera device uses fluorescent light as the assumed scene
   6322      * illumination for white balance.</p>
   6323      * <p>While the exact white balance transforms are up to the
   6324      * camera device, they will approximately match the CIE
   6325      * standard illuminant F2.</p>
   6326      * <p>The application's values for ACAMERA_COLOR_CORRECTION_TRANSFORM
   6327      * and ACAMERA_COLOR_CORRECTION_GAINS are ignored.
   6328      * For devices that support the MANUAL_POST_PROCESSING capability, the
   6329      * values used by the camera device for the transform and gains
   6330      * will be available in the capture result for this request.</p>
   6331      *
   6332      * @see ACAMERA_COLOR_CORRECTION_GAINS
   6333      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   6334      */
   6335     ACAMERA_CONTROL_AWB_MODE_FLUORESCENT                             = 3,
   6336 
   6337     /**
   6338      * <p>The camera device's auto-white balance routine is disabled;
   6339      * the camera device uses warm fluorescent light as the assumed scene
   6340      * illumination for white balance.</p>
   6341      * <p>While the exact white balance transforms are up to the
   6342      * camera device, they will approximately match the CIE
   6343      * standard illuminant F4.</p>
   6344      * <p>The application's values for ACAMERA_COLOR_CORRECTION_TRANSFORM
   6345      * and ACAMERA_COLOR_CORRECTION_GAINS are ignored.
   6346      * For devices that support the MANUAL_POST_PROCESSING capability, the
   6347      * values used by the camera device for the transform and gains
   6348      * will be available in the capture result for this request.</p>
   6349      *
   6350      * @see ACAMERA_COLOR_CORRECTION_GAINS
   6351      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   6352      */
   6353     ACAMERA_CONTROL_AWB_MODE_WARM_FLUORESCENT                        = 4,
   6354 
   6355     /**
   6356      * <p>The camera device's auto-white balance routine is disabled;
   6357      * the camera device uses daylight light as the assumed scene
   6358      * illumination for white balance.</p>
   6359      * <p>While the exact white balance transforms are up to the
   6360      * camera device, they will approximately match the CIE
   6361      * standard illuminant D65.</p>
   6362      * <p>The application's values for ACAMERA_COLOR_CORRECTION_TRANSFORM
   6363      * and ACAMERA_COLOR_CORRECTION_GAINS are ignored.
   6364      * For devices that support the MANUAL_POST_PROCESSING capability, the
   6365      * values used by the camera device for the transform and gains
   6366      * will be available in the capture result for this request.</p>
   6367      *
   6368      * @see ACAMERA_COLOR_CORRECTION_GAINS
   6369      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   6370      */
   6371     ACAMERA_CONTROL_AWB_MODE_DAYLIGHT                                = 5,
   6372 
   6373     /**
   6374      * <p>The camera device's auto-white balance routine is disabled;
   6375      * the camera device uses cloudy daylight light as the assumed scene
   6376      * illumination for white balance.</p>
   6377      * <p>The application's values for ACAMERA_COLOR_CORRECTION_TRANSFORM
   6378      * and ACAMERA_COLOR_CORRECTION_GAINS are ignored.
   6379      * For devices that support the MANUAL_POST_PROCESSING capability, the
   6380      * values used by the camera device for the transform and gains
   6381      * will be available in the capture result for this request.</p>
   6382      *
   6383      * @see ACAMERA_COLOR_CORRECTION_GAINS
   6384      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   6385      */
   6386     ACAMERA_CONTROL_AWB_MODE_CLOUDY_DAYLIGHT                         = 6,
   6387 
   6388     /**
   6389      * <p>The camera device's auto-white balance routine is disabled;
   6390      * the camera device uses twilight light as the assumed scene
   6391      * illumination for white balance.</p>
   6392      * <p>The application's values for ACAMERA_COLOR_CORRECTION_TRANSFORM
   6393      * and ACAMERA_COLOR_CORRECTION_GAINS are ignored.
   6394      * For devices that support the MANUAL_POST_PROCESSING capability, the
   6395      * values used by the camera device for the transform and gains
   6396      * will be available in the capture result for this request.</p>
   6397      *
   6398      * @see ACAMERA_COLOR_CORRECTION_GAINS
   6399      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   6400      */
   6401     ACAMERA_CONTROL_AWB_MODE_TWILIGHT                                = 7,
   6402 
   6403     /**
   6404      * <p>The camera device's auto-white balance routine is disabled;
   6405      * the camera device uses shade light as the assumed scene
   6406      * illumination for white balance.</p>
   6407      * <p>The application's values for ACAMERA_COLOR_CORRECTION_TRANSFORM
   6408      * and ACAMERA_COLOR_CORRECTION_GAINS are ignored.
   6409      * For devices that support the MANUAL_POST_PROCESSING capability, the
   6410      * values used by the camera device for the transform and gains
   6411      * will be available in the capture result for this request.</p>
   6412      *
   6413      * @see ACAMERA_COLOR_CORRECTION_GAINS
   6414      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   6415      */
   6416     ACAMERA_CONTROL_AWB_MODE_SHADE                                   = 8,
   6417 
   6418 } acamera_metadata_enum_android_control_awb_mode_t;
   6419 
   6420 // ACAMERA_CONTROL_CAPTURE_INTENT
   6421 typedef enum acamera_metadata_enum_acamera_control_capture_intent {
   6422     /**
   6423      * <p>The goal of this request doesn't fall into the other
   6424      * categories. The camera device will default to preview-like
   6425      * behavior.</p>
   6426      */
   6427     ACAMERA_CONTROL_CAPTURE_INTENT_CUSTOM                            = 0,
   6428 
   6429     /**
   6430      * <p>This request is for a preview-like use case.</p>
   6431      * <p>The precapture trigger may be used to start off a metering
   6432      * w/flash sequence.</p>
   6433      */
   6434     ACAMERA_CONTROL_CAPTURE_INTENT_PREVIEW                           = 1,
   6435 
   6436     /**
   6437      * <p>This request is for a still capture-type
   6438      * use case.</p>
   6439      * <p>If the flash unit is under automatic control, it may fire as needed.</p>
   6440      */
   6441     ACAMERA_CONTROL_CAPTURE_INTENT_STILL_CAPTURE                     = 2,
   6442 
   6443     /**
   6444      * <p>This request is for a video recording
   6445      * use case.</p>
   6446      */
   6447     ACAMERA_CONTROL_CAPTURE_INTENT_VIDEO_RECORD                      = 3,
   6448 
   6449     /**
   6450      * <p>This request is for a video snapshot (still
   6451      * image while recording video) use case.</p>
   6452      * <p>The camera device should take the highest-quality image
   6453      * possible (given the other settings) without disrupting the
   6454      * frame rate of video recording.  </p>
   6455      */
   6456     ACAMERA_CONTROL_CAPTURE_INTENT_VIDEO_SNAPSHOT                    = 4,
   6457 
   6458     /**
   6459      * <p>This request is for a ZSL usecase; the
   6460      * application will stream full-resolution images and
   6461      * reprocess one or several later for a final
   6462      * capture.</p>
   6463      */
   6464     ACAMERA_CONTROL_CAPTURE_INTENT_ZERO_SHUTTER_LAG                  = 5,
   6465 
   6466     /**
   6467      * <p>This request is for manual capture use case where
   6468      * the applications want to directly control the capture parameters.</p>
   6469      * <p>For example, the application may wish to manually control
   6470      * ACAMERA_SENSOR_EXPOSURE_TIME, ACAMERA_SENSOR_SENSITIVITY, etc.</p>
   6471      *
   6472      * @see ACAMERA_SENSOR_EXPOSURE_TIME
   6473      * @see ACAMERA_SENSOR_SENSITIVITY
   6474      */
   6475     ACAMERA_CONTROL_CAPTURE_INTENT_MANUAL                            = 6,
   6476 
   6477     /**
   6478      * <p>This request is for a motion tracking use case, where
   6479      * the application will use camera and inertial sensor data to
   6480      * locate and track objects in the world.</p>
   6481      * <p>The camera device auto-exposure routine will limit the exposure time
   6482      * of the camera to no more than 20 milliseconds, to minimize motion blur.</p>
   6483      */
   6484     ACAMERA_CONTROL_CAPTURE_INTENT_MOTION_TRACKING                   = 7,
   6485 
   6486 } acamera_metadata_enum_android_control_capture_intent_t;
   6487 
   6488 // ACAMERA_CONTROL_EFFECT_MODE
   6489 typedef enum acamera_metadata_enum_acamera_control_effect_mode {
   6490     /**
   6491      * <p>No color effect will be applied.</p>
   6492      */
   6493     ACAMERA_CONTROL_EFFECT_MODE_OFF                                  = 0,
   6494 
   6495     /**
   6496      * <p>A "monocolor" effect where the image is mapped into
   6497      * a single color.</p>
   6498      * <p>This will typically be grayscale.</p>
   6499      */
   6500     ACAMERA_CONTROL_EFFECT_MODE_MONO                                 = 1,
   6501 
   6502     /**
   6503      * <p>A "photo-negative" effect where the image's colors
   6504      * are inverted.</p>
   6505      */
   6506     ACAMERA_CONTROL_EFFECT_MODE_NEGATIVE                             = 2,
   6507 
   6508     /**
   6509      * <p>A "solarisation" effect (Sabattier effect) where the
   6510      * image is wholly or partially reversed in
   6511      * tone.</p>
   6512      */
   6513     ACAMERA_CONTROL_EFFECT_MODE_SOLARIZE                             = 3,
   6514 
   6515     /**
   6516      * <p>A "sepia" effect where the image is mapped into warm
   6517      * gray, red, and brown tones.</p>
   6518      */
   6519     ACAMERA_CONTROL_EFFECT_MODE_SEPIA                                = 4,
   6520 
   6521     /**
   6522      * <p>A "posterization" effect where the image uses
   6523      * discrete regions of tone rather than a continuous
   6524      * gradient of tones.</p>
   6525      */
   6526     ACAMERA_CONTROL_EFFECT_MODE_POSTERIZE                            = 5,
   6527 
   6528     /**
   6529      * <p>A "whiteboard" effect where the image is typically displayed
   6530      * as regions of white, with black or grey details.</p>
   6531      */
   6532     ACAMERA_CONTROL_EFFECT_MODE_WHITEBOARD                           = 6,
   6533 
   6534     /**
   6535      * <p>A "blackboard" effect where the image is typically displayed
   6536      * as regions of black, with white or grey details.</p>
   6537      */
   6538     ACAMERA_CONTROL_EFFECT_MODE_BLACKBOARD                           = 7,
   6539 
   6540     /**
   6541      * <p>An "aqua" effect where a blue hue is added to the image.</p>
   6542      */
   6543     ACAMERA_CONTROL_EFFECT_MODE_AQUA                                 = 8,
   6544 
   6545 } acamera_metadata_enum_android_control_effect_mode_t;
   6546 
   6547 // ACAMERA_CONTROL_MODE
   6548 typedef enum acamera_metadata_enum_acamera_control_mode {
   6549     /**
   6550      * <p>Full application control of pipeline.</p>
   6551      * <p>All control by the device's metering and focusing (3A)
   6552      * routines is disabled, and no other settings in
   6553      * ACAMERA_CONTROL_* have any effect, except that
   6554      * ACAMERA_CONTROL_CAPTURE_INTENT may be used by the camera
   6555      * device to select post-processing values for processing
   6556      * blocks that do not allow for manual control, or are not
   6557      * exposed by the camera API.</p>
   6558      * <p>However, the camera device's 3A routines may continue to
   6559      * collect statistics and update their internal state so that
   6560      * when control is switched to AUTO mode, good control values
   6561      * can be immediately applied.</p>
   6562      *
   6563      * @see ACAMERA_CONTROL_CAPTURE_INTENT
   6564      */
   6565     ACAMERA_CONTROL_MODE_OFF                                         = 0,
   6566 
   6567     /**
   6568      * <p>Use settings for each individual 3A routine.</p>
   6569      * <p>Manual control of capture parameters is disabled. All
   6570      * controls in ACAMERA_CONTROL_* besides sceneMode take
   6571      * effect.</p>
   6572      */
   6573     ACAMERA_CONTROL_MODE_AUTO                                        = 1,
   6574 
   6575     /**
   6576      * <p>Use a specific scene mode.</p>
   6577      * <p>Enabling this disables control.aeMode, control.awbMode and
   6578      * control.afMode controls; the camera device will ignore
   6579      * those settings while USE_SCENE_MODE is active (except for
   6580      * FACE_PRIORITY scene mode). Other control entries are still active.
   6581      * This setting can only be used if scene mode is supported (i.e.
   6582      * ACAMERA_CONTROL_AVAILABLE_SCENE_MODES
   6583      * contain some modes other than DISABLED).</p>
   6584      *
   6585      * @see ACAMERA_CONTROL_AVAILABLE_SCENE_MODES
   6586      */
   6587     ACAMERA_CONTROL_MODE_USE_SCENE_MODE                              = 2,
   6588 
   6589     /**
   6590      * <p>Same as OFF mode, except that this capture will not be
   6591      * used by camera device background auto-exposure, auto-white balance and
   6592      * auto-focus algorithms (3A) to update their statistics.</p>
   6593      * <p>Specifically, the 3A routines are locked to the last
   6594      * values set from a request with AUTO, OFF, or
   6595      * USE_SCENE_MODE, and any statistics or state updates
   6596      * collected from manual captures with OFF_KEEP_STATE will be
   6597      * discarded by the camera device.</p>
   6598      */
   6599     ACAMERA_CONTROL_MODE_OFF_KEEP_STATE                              = 3,
   6600 
   6601 } acamera_metadata_enum_android_control_mode_t;
   6602 
   6603 // ACAMERA_CONTROL_SCENE_MODE
   6604 typedef enum acamera_metadata_enum_acamera_control_scene_mode {
   6605     /**
   6606      * <p>Indicates that no scene modes are set for a given capture request.</p>
   6607      */
   6608     ACAMERA_CONTROL_SCENE_MODE_DISABLED                              = 0,
   6609 
   6610     /**
   6611      * <p>If face detection support exists, use face
   6612      * detection data for auto-focus, auto-white balance, and
   6613      * auto-exposure routines.</p>
   6614      * <p>If face detection statistics are disabled
   6615      * (i.e. ACAMERA_STATISTICS_FACE_DETECT_MODE is set to OFF),
   6616      * this should still operate correctly (but will not return
   6617      * face detection statistics to the framework).</p>
   6618      * <p>Unlike the other scene modes, ACAMERA_CONTROL_AE_MODE,
   6619      * ACAMERA_CONTROL_AWB_MODE, and ACAMERA_CONTROL_AF_MODE
   6620      * remain active when FACE_PRIORITY is set.</p>
   6621      *
   6622      * @see ACAMERA_CONTROL_AE_MODE
   6623      * @see ACAMERA_CONTROL_AF_MODE
   6624      * @see ACAMERA_CONTROL_AWB_MODE
   6625      * @see ACAMERA_STATISTICS_FACE_DETECT_MODE
   6626      */
   6627     ACAMERA_CONTROL_SCENE_MODE_FACE_PRIORITY                         = 1,
   6628 
   6629     /**
   6630      * <p>Optimized for photos of quickly moving objects.</p>
   6631      * <p>Similar to SPORTS.</p>
   6632      */
   6633     ACAMERA_CONTROL_SCENE_MODE_ACTION                                = 2,
   6634 
   6635     /**
   6636      * <p>Optimized for still photos of people.</p>
   6637      */
   6638     ACAMERA_CONTROL_SCENE_MODE_PORTRAIT                              = 3,
   6639 
   6640     /**
   6641      * <p>Optimized for photos of distant macroscopic objects.</p>
   6642      */
   6643     ACAMERA_CONTROL_SCENE_MODE_LANDSCAPE                             = 4,
   6644 
   6645     /**
   6646      * <p>Optimized for low-light settings.</p>
   6647      */
   6648     ACAMERA_CONTROL_SCENE_MODE_NIGHT                                 = 5,
   6649 
   6650     /**
   6651      * <p>Optimized for still photos of people in low-light
   6652      * settings.</p>
   6653      */
   6654     ACAMERA_CONTROL_SCENE_MODE_NIGHT_PORTRAIT                        = 6,
   6655 
   6656     /**
   6657      * <p>Optimized for dim, indoor settings where flash must
   6658      * remain off.</p>
   6659      */
   6660     ACAMERA_CONTROL_SCENE_MODE_THEATRE                               = 7,
   6661 
   6662     /**
   6663      * <p>Optimized for bright, outdoor beach settings.</p>
   6664      */
   6665     ACAMERA_CONTROL_SCENE_MODE_BEACH                                 = 8,
   6666 
   6667     /**
   6668      * <p>Optimized for bright, outdoor settings containing snow.</p>
   6669      */
   6670     ACAMERA_CONTROL_SCENE_MODE_SNOW                                  = 9,
   6671 
   6672     /**
   6673      * <p>Optimized for scenes of the setting sun.</p>
   6674      */
   6675     ACAMERA_CONTROL_SCENE_MODE_SUNSET                                = 10,
   6676 
   6677     /**
   6678      * <p>Optimized to avoid blurry photos due to small amounts of
   6679      * device motion (for example: due to hand shake).</p>
   6680      */
   6681     ACAMERA_CONTROL_SCENE_MODE_STEADYPHOTO                           = 11,
   6682 
   6683     /**
   6684      * <p>Optimized for nighttime photos of fireworks.</p>
   6685      */
   6686     ACAMERA_CONTROL_SCENE_MODE_FIREWORKS                             = 12,
   6687 
   6688     /**
   6689      * <p>Optimized for photos of quickly moving people.</p>
   6690      * <p>Similar to ACTION.</p>
   6691      */
   6692     ACAMERA_CONTROL_SCENE_MODE_SPORTS                                = 13,
   6693 
   6694     /**
   6695      * <p>Optimized for dim, indoor settings with multiple moving
   6696      * people.</p>
   6697      */
   6698     ACAMERA_CONTROL_SCENE_MODE_PARTY                                 = 14,
   6699 
   6700     /**
   6701      * <p>Optimized for dim settings where the main light source
   6702      * is a candle.</p>
   6703      */
   6704     ACAMERA_CONTROL_SCENE_MODE_CANDLELIGHT                           = 15,
   6705 
   6706     /**
   6707      * <p>Optimized for accurately capturing a photo of barcode
   6708      * for use by camera applications that wish to read the
   6709      * barcode value.</p>
   6710      */
   6711     ACAMERA_CONTROL_SCENE_MODE_BARCODE                               = 16,
   6712 
   6713     /**
   6714      * <p>Turn on a device-specific high dynamic range (HDR) mode.</p>
   6715      * <p>In this scene mode, the camera device captures images
   6716      * that keep a larger range of scene illumination levels
   6717      * visible in the final image. For example, when taking a
   6718      * picture of a object in front of a bright window, both
   6719      * the object and the scene through the window may be
   6720      * visible when using HDR mode, while in normal AUTO mode,
   6721      * one or the other may be poorly exposed. As a tradeoff,
   6722      * HDR mode generally takes much longer to capture a single
   6723      * image, has no user control, and may have other artifacts
   6724      * depending on the HDR method used.</p>
   6725      * <p>Therefore, HDR captures operate at a much slower rate
   6726      * than regular captures.</p>
   6727      * <p>In this mode, on LIMITED or FULL devices, when a request
   6728      * is made with a ACAMERA_CONTROL_CAPTURE_INTENT of
   6729      * STILL_CAPTURE, the camera device will capture an image
   6730      * using a high dynamic range capture technique.  On LEGACY
   6731      * devices, captures that target a JPEG-format output will
   6732      * be captured with HDR, and the capture intent is not
   6733      * relevant.</p>
   6734      * <p>The HDR capture may involve the device capturing a burst
   6735      * of images internally and combining them into one, or it
   6736      * may involve the device using specialized high dynamic
   6737      * range capture hardware. In all cases, a single image is
   6738      * produced in response to a capture request submitted
   6739      * while in HDR mode.</p>
   6740      * <p>Since substantial post-processing is generally needed to
   6741      * produce an HDR image, only YUV, PRIVATE, and JPEG
   6742      * outputs are supported for LIMITED/FULL device HDR
   6743      * captures, and only JPEG outputs are supported for LEGACY
   6744      * HDR captures. Using a RAW output for HDR capture is not
   6745      * supported.</p>
   6746      * <p>Some devices may also support always-on HDR, which
   6747      * applies HDR processing at full frame rate.  For these
   6748      * devices, intents other than STILL_CAPTURE will also
   6749      * produce an HDR output with no frame rate impact compared
   6750      * to normal operation, though the quality may be lower
   6751      * than for STILL_CAPTURE intents.</p>
   6752      * <p>If SCENE_MODE_HDR is used with unsupported output types
   6753      * or capture intents, the images captured will be as if
   6754      * the SCENE_MODE was not enabled at all.</p>
   6755      *
   6756      * @see ACAMERA_CONTROL_CAPTURE_INTENT
   6757      */
   6758     ACAMERA_CONTROL_SCENE_MODE_HDR                                   = 18,
   6759 
   6760 } acamera_metadata_enum_android_control_scene_mode_t;
   6761 
   6762 // ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE
   6763 typedef enum acamera_metadata_enum_acamera_control_video_stabilization_mode {
   6764     /**
   6765      * <p>Video stabilization is disabled.</p>
   6766      */
   6767     ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE_OFF                     = 0,
   6768 
   6769     /**
   6770      * <p>Video stabilization is enabled.</p>
   6771      */
   6772     ACAMERA_CONTROL_VIDEO_STABILIZATION_MODE_ON                      = 1,
   6773 
   6774 } acamera_metadata_enum_android_control_video_stabilization_mode_t;
   6775 
   6776 // ACAMERA_CONTROL_AE_STATE
   6777 typedef enum acamera_metadata_enum_acamera_control_ae_state {
   6778     /**
   6779      * <p>AE is off or recently reset.</p>
   6780      * <p>When a camera device is opened, it starts in
   6781      * this state. This is a transient state, the camera device may skip reporting
   6782      * this state in capture result.</p>
   6783      */
   6784     ACAMERA_CONTROL_AE_STATE_INACTIVE                                = 0,
   6785 
   6786     /**
   6787      * <p>AE doesn't yet have a good set of control values
   6788      * for the current scene.</p>
   6789      * <p>This is a transient state, the camera device may skip
   6790      * reporting this state in capture result.</p>
   6791      */
   6792     ACAMERA_CONTROL_AE_STATE_SEARCHING                               = 1,
   6793 
   6794     /**
   6795      * <p>AE has a good set of control values for the
   6796      * current scene.</p>
   6797      */
   6798     ACAMERA_CONTROL_AE_STATE_CONVERGED                               = 2,
   6799 
   6800     /**
   6801      * <p>AE has been locked.</p>
   6802      */
   6803     ACAMERA_CONTROL_AE_STATE_LOCKED                                  = 3,
   6804 
   6805     /**
   6806      * <p>AE has a good set of control values, but flash
   6807      * needs to be fired for good quality still
   6808      * capture.</p>
   6809      */
   6810     ACAMERA_CONTROL_AE_STATE_FLASH_REQUIRED                          = 4,
   6811 
   6812     /**
   6813      * <p>AE has been asked to do a precapture sequence
   6814      * and is currently executing it.</p>
   6815      * <p>Precapture can be triggered through setting
   6816      * ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER to START. Currently
   6817      * active and completed (if it causes camera device internal AE lock) precapture
   6818      * metering sequence can be canceled through setting
   6819      * ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER to CANCEL.</p>
   6820      * <p>Once PRECAPTURE completes, AE will transition to CONVERGED
   6821      * or FLASH_REQUIRED as appropriate. This is a transient
   6822      * state, the camera device may skip reporting this state in
   6823      * capture result.</p>
   6824      *
   6825      * @see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
   6826      */
   6827     ACAMERA_CONTROL_AE_STATE_PRECAPTURE                              = 5,
   6828 
   6829 } acamera_metadata_enum_android_control_ae_state_t;
   6830 
   6831 // ACAMERA_CONTROL_AF_STATE
   6832 typedef enum acamera_metadata_enum_acamera_control_af_state {
   6833     /**
   6834      * <p>AF is off or has not yet tried to scan/been asked
   6835      * to scan.</p>
   6836      * <p>When a camera device is opened, it starts in this
   6837      * state. This is a transient state, the camera device may
   6838      * skip reporting this state in capture
   6839      * result.</p>
   6840      */
   6841     ACAMERA_CONTROL_AF_STATE_INACTIVE                                = 0,
   6842 
   6843     /**
   6844      * <p>AF is currently performing an AF scan initiated the
   6845      * camera device in a continuous autofocus mode.</p>
   6846      * <p>Only used by CONTINUOUS_* AF modes. This is a transient
   6847      * state, the camera device may skip reporting this state in
   6848      * capture result.</p>
   6849      */
   6850     ACAMERA_CONTROL_AF_STATE_PASSIVE_SCAN                            = 1,
   6851 
   6852     /**
   6853      * <p>AF currently believes it is in focus, but may
   6854      * restart scanning at any time.</p>
   6855      * <p>Only used by CONTINUOUS_* AF modes. This is a transient
   6856      * state, the camera device may skip reporting this state in
   6857      * capture result.</p>
   6858      */
   6859     ACAMERA_CONTROL_AF_STATE_PASSIVE_FOCUSED                         = 2,
   6860 
   6861     /**
   6862      * <p>AF is performing an AF scan because it was
   6863      * triggered by AF trigger.</p>
   6864      * <p>Only used by AUTO or MACRO AF modes. This is a transient
   6865      * state, the camera device may skip reporting this state in
   6866      * capture result.</p>
   6867      */
   6868     ACAMERA_CONTROL_AF_STATE_ACTIVE_SCAN                             = 3,
   6869 
   6870     /**
   6871      * <p>AF believes it is focused correctly and has locked
   6872      * focus.</p>
   6873      * <p>This state is reached only after an explicit START AF trigger has been
   6874      * sent (ACAMERA_CONTROL_AF_TRIGGER), when good focus has been obtained.</p>
   6875      * <p>The lens will remain stationary until the AF mode (ACAMERA_CONTROL_AF_MODE) is changed or
   6876      * a new AF trigger is sent to the camera device (ACAMERA_CONTROL_AF_TRIGGER).</p>
   6877      *
   6878      * @see ACAMERA_CONTROL_AF_MODE
   6879      * @see ACAMERA_CONTROL_AF_TRIGGER
   6880      */
   6881     ACAMERA_CONTROL_AF_STATE_FOCUSED_LOCKED                          = 4,
   6882 
   6883     /**
   6884      * <p>AF has failed to focus successfully and has locked
   6885      * focus.</p>
   6886      * <p>This state is reached only after an explicit START AF trigger has been
   6887      * sent (ACAMERA_CONTROL_AF_TRIGGER), when good focus cannot be obtained.</p>
   6888      * <p>The lens will remain stationary until the AF mode (ACAMERA_CONTROL_AF_MODE) is changed or
   6889      * a new AF trigger is sent to the camera device (ACAMERA_CONTROL_AF_TRIGGER).</p>
   6890      *
   6891      * @see ACAMERA_CONTROL_AF_MODE
   6892      * @see ACAMERA_CONTROL_AF_TRIGGER
   6893      */
   6894     ACAMERA_CONTROL_AF_STATE_NOT_FOCUSED_LOCKED                      = 5,
   6895 
   6896     /**
   6897      * <p>AF finished a passive scan without finding focus,
   6898      * and may restart scanning at any time.</p>
   6899      * <p>Only used by CONTINUOUS_* AF modes. This is a transient state, the camera
   6900      * device may skip reporting this state in capture result.</p>
   6901      * <p>LEGACY camera devices do not support this state. When a passive
   6902      * scan has finished, it will always go to PASSIVE_FOCUSED.</p>
   6903      */
   6904     ACAMERA_CONTROL_AF_STATE_PASSIVE_UNFOCUSED                       = 6,
   6905 
   6906 } acamera_metadata_enum_android_control_af_state_t;
   6907 
   6908 // ACAMERA_CONTROL_AWB_STATE
   6909 typedef enum acamera_metadata_enum_acamera_control_awb_state {
   6910     /**
   6911      * <p>AWB is not in auto mode, or has not yet started metering.</p>
   6912      * <p>When a camera device is opened, it starts in this
   6913      * state. This is a transient state, the camera device may
   6914      * skip reporting this state in capture
   6915      * result.</p>
   6916      */
   6917     ACAMERA_CONTROL_AWB_STATE_INACTIVE                               = 0,
   6918 
   6919     /**
   6920      * <p>AWB doesn't yet have a good set of control
   6921      * values for the current scene.</p>
   6922      * <p>This is a transient state, the camera device
   6923      * may skip reporting this state in capture result.</p>
   6924      */
   6925     ACAMERA_CONTROL_AWB_STATE_SEARCHING                              = 1,
   6926 
   6927     /**
   6928      * <p>AWB has a good set of control values for the
   6929      * current scene.</p>
   6930      */
   6931     ACAMERA_CONTROL_AWB_STATE_CONVERGED                              = 2,
   6932 
   6933     /**
   6934      * <p>AWB has been locked.</p>
   6935      */
   6936     ACAMERA_CONTROL_AWB_STATE_LOCKED                                 = 3,
   6937 
   6938 } acamera_metadata_enum_android_control_awb_state_t;
   6939 
   6940 // ACAMERA_CONTROL_AE_LOCK_AVAILABLE
   6941 typedef enum acamera_metadata_enum_acamera_control_ae_lock_available {
   6942     ACAMERA_CONTROL_AE_LOCK_AVAILABLE_FALSE                          = 0,
   6943 
   6944     ACAMERA_CONTROL_AE_LOCK_AVAILABLE_TRUE                           = 1,
   6945 
   6946 } acamera_metadata_enum_android_control_ae_lock_available_t;
   6947 
   6948 // ACAMERA_CONTROL_AWB_LOCK_AVAILABLE
   6949 typedef enum acamera_metadata_enum_acamera_control_awb_lock_available {
   6950     ACAMERA_CONTROL_AWB_LOCK_AVAILABLE_FALSE                         = 0,
   6951 
   6952     ACAMERA_CONTROL_AWB_LOCK_AVAILABLE_TRUE                          = 1,
   6953 
   6954 } acamera_metadata_enum_android_control_awb_lock_available_t;
   6955 
   6956 // ACAMERA_CONTROL_ENABLE_ZSL
   6957 typedef enum acamera_metadata_enum_acamera_control_enable_zsl {
   6958     /**
   6959      * <p>Requests with ACAMERA_CONTROL_CAPTURE_INTENT == STILL_CAPTURE must be captured
   6960      * after previous requests.</p>
   6961      *
   6962      * @see ACAMERA_CONTROL_CAPTURE_INTENT
   6963      */
   6964     ACAMERA_CONTROL_ENABLE_ZSL_FALSE                                 = 0,
   6965 
   6966     /**
   6967      * <p>Requests with ACAMERA_CONTROL_CAPTURE_INTENT == STILL_CAPTURE may or may not be
   6968      * captured before previous requests.</p>
   6969      *
   6970      * @see ACAMERA_CONTROL_CAPTURE_INTENT
   6971      */
   6972     ACAMERA_CONTROL_ENABLE_ZSL_TRUE                                  = 1,
   6973 
   6974 } acamera_metadata_enum_android_control_enable_zsl_t;
   6975 
   6976 // ACAMERA_CONTROL_AF_SCENE_CHANGE
   6977 typedef enum acamera_metadata_enum_acamera_control_af_scene_change {
   6978     /**
   6979      * <p>Scene change is not detected within the AF region(s).</p>
   6980      */
   6981     ACAMERA_CONTROL_AF_SCENE_CHANGE_NOT_DETECTED                     = 0,
   6982 
   6983     /**
   6984      * <p>Scene change is detected within the AF region(s).</p>
   6985      */
   6986     ACAMERA_CONTROL_AF_SCENE_CHANGE_DETECTED                         = 1,
   6987 
   6988 } acamera_metadata_enum_android_control_af_scene_change_t;
   6989 
   6990 
   6991 
   6992 // ACAMERA_EDGE_MODE
   6993 typedef enum acamera_metadata_enum_acamera_edge_mode {
   6994     /**
   6995      * <p>No edge enhancement is applied.</p>
   6996      */
   6997     ACAMERA_EDGE_MODE_OFF                                            = 0,
   6998 
   6999     /**
   7000      * <p>Apply edge enhancement at a quality level that does not slow down frame rate
   7001      * relative to sensor output. It may be the same as OFF if edge enhancement will
   7002      * slow down frame rate relative to sensor.</p>
   7003      */
   7004     ACAMERA_EDGE_MODE_FAST                                           = 1,
   7005 
   7006     /**
   7007      * <p>Apply high-quality edge enhancement, at a cost of possibly reduced output frame rate.</p>
   7008      */
   7009     ACAMERA_EDGE_MODE_HIGH_QUALITY                                   = 2,
   7010 
   7011     /**
   7012      * <p>Edge enhancement is applied at different
   7013      * levels for different output streams, based on resolution. Streams at maximum recording
   7014      * resolution (see {@link ACameraDevice_createCaptureSession })
   7015      * or below have edge enhancement applied, while higher-resolution streams have no edge
   7016      * enhancement applied. The level of edge enhancement for low-resolution streams is tuned
   7017      * so that frame rate is not impacted, and the quality is equal to or better than FAST
   7018      * (since it is only applied to lower-resolution outputs, quality may improve from FAST).</p>
   7019      * <p>This mode is intended to be used by applications operating in a zero-shutter-lag mode
   7020      * with YUV or PRIVATE reprocessing, where the application continuously captures
   7021      * high-resolution intermediate buffers into a circular buffer, from which a final image is
   7022      * produced via reprocessing when a user takes a picture.  For such a use case, the
   7023      * high-resolution buffers must not have edge enhancement applied to maximize efficiency of
   7024      * preview and to avoid double-applying enhancement when reprocessed, while low-resolution
   7025      * buffers (used for recording or preview, generally) need edge enhancement applied for
   7026      * reasonable preview quality.</p>
   7027      * <p>This mode is guaranteed to be supported by devices that support either the
   7028      * YUV_REPROCESSING or PRIVATE_REPROCESSING capabilities
   7029      * (ACAMERA_REQUEST_AVAILABLE_CAPABILITIES lists either of those capabilities) and it will
   7030      * be the default mode for CAMERA3_TEMPLATE_ZERO_SHUTTER_LAG template.</p>
   7031      *
   7032      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   7033      */
   7034     ACAMERA_EDGE_MODE_ZERO_SHUTTER_LAG                               = 3,
   7035 
   7036 } acamera_metadata_enum_android_edge_mode_t;
   7037 
   7038 
   7039 // ACAMERA_FLASH_MODE
   7040 typedef enum acamera_metadata_enum_acamera_flash_mode {
   7041     /**
   7042      * <p>Do not fire the flash for this capture.</p>
   7043      */
   7044     ACAMERA_FLASH_MODE_OFF                                           = 0,
   7045 
   7046     /**
   7047      * <p>If the flash is available and charged, fire flash
   7048      * for this capture.</p>
   7049      */
   7050     ACAMERA_FLASH_MODE_SINGLE                                        = 1,
   7051 
   7052     /**
   7053      * <p>Transition flash to continuously on.</p>
   7054      */
   7055     ACAMERA_FLASH_MODE_TORCH                                         = 2,
   7056 
   7057 } acamera_metadata_enum_android_flash_mode_t;
   7058 
   7059 // ACAMERA_FLASH_STATE
   7060 typedef enum acamera_metadata_enum_acamera_flash_state {
   7061     /**
   7062      * <p>No flash on camera.</p>
   7063      */
   7064     ACAMERA_FLASH_STATE_UNAVAILABLE                                  = 0,
   7065 
   7066     /**
   7067      * <p>Flash is charging and cannot be fired.</p>
   7068      */
   7069     ACAMERA_FLASH_STATE_CHARGING                                     = 1,
   7070 
   7071     /**
   7072      * <p>Flash is ready to fire.</p>
   7073      */
   7074     ACAMERA_FLASH_STATE_READY                                        = 2,
   7075 
   7076     /**
   7077      * <p>Flash fired for this capture.</p>
   7078      */
   7079     ACAMERA_FLASH_STATE_FIRED                                        = 3,
   7080 
   7081     /**
   7082      * <p>Flash partially illuminated this frame.</p>
   7083      * <p>This is usually due to the next or previous frame having
   7084      * the flash fire, and the flash spilling into this capture
   7085      * due to hardware limitations.</p>
   7086      */
   7087     ACAMERA_FLASH_STATE_PARTIAL                                      = 4,
   7088 
   7089 } acamera_metadata_enum_android_flash_state_t;
   7090 
   7091 
   7092 // ACAMERA_FLASH_INFO_AVAILABLE
   7093 typedef enum acamera_metadata_enum_acamera_flash_info_available {
   7094     ACAMERA_FLASH_INFO_AVAILABLE_FALSE                               = 0,
   7095 
   7096     ACAMERA_FLASH_INFO_AVAILABLE_TRUE                                = 1,
   7097 
   7098 } acamera_metadata_enum_android_flash_info_available_t;
   7099 
   7100 
   7101 // ACAMERA_HOT_PIXEL_MODE
   7102 typedef enum acamera_metadata_enum_acamera_hot_pixel_mode {
   7103     /**
   7104      * <p>No hot pixel correction is applied.</p>
   7105      * <p>The frame rate must not be reduced relative to sensor raw output
   7106      * for this option.</p>
   7107      * <p>The hotpixel map may be returned in ACAMERA_STATISTICS_HOT_PIXEL_MAP.</p>
   7108      *
   7109      * @see ACAMERA_STATISTICS_HOT_PIXEL_MAP
   7110      */
   7111     ACAMERA_HOT_PIXEL_MODE_OFF                                       = 0,
   7112 
   7113     /**
   7114      * <p>Hot pixel correction is applied, without reducing frame
   7115      * rate relative to sensor raw output.</p>
   7116      * <p>The hotpixel map may be returned in ACAMERA_STATISTICS_HOT_PIXEL_MAP.</p>
   7117      *
   7118      * @see ACAMERA_STATISTICS_HOT_PIXEL_MAP
   7119      */
   7120     ACAMERA_HOT_PIXEL_MODE_FAST                                      = 1,
   7121 
   7122     /**
   7123      * <p>High-quality hot pixel correction is applied, at a cost
   7124      * of possibly reduced frame rate relative to sensor raw output.</p>
   7125      * <p>The hotpixel map may be returned in ACAMERA_STATISTICS_HOT_PIXEL_MAP.</p>
   7126      *
   7127      * @see ACAMERA_STATISTICS_HOT_PIXEL_MAP
   7128      */
   7129     ACAMERA_HOT_PIXEL_MODE_HIGH_QUALITY                              = 2,
   7130 
   7131 } acamera_metadata_enum_android_hot_pixel_mode_t;
   7132 
   7133 
   7134 
   7135 // ACAMERA_LENS_OPTICAL_STABILIZATION_MODE
   7136 typedef enum acamera_metadata_enum_acamera_lens_optical_stabilization_mode {
   7137     /**
   7138      * <p>Optical stabilization is unavailable.</p>
   7139      */
   7140     ACAMERA_LENS_OPTICAL_STABILIZATION_MODE_OFF                      = 0,
   7141 
   7142     /**
   7143      * <p>Optical stabilization is enabled.</p>
   7144      */
   7145     ACAMERA_LENS_OPTICAL_STABILIZATION_MODE_ON                       = 1,
   7146 
   7147 } acamera_metadata_enum_android_lens_optical_stabilization_mode_t;
   7148 
   7149 // ACAMERA_LENS_FACING
   7150 typedef enum acamera_metadata_enum_acamera_lens_facing {
   7151     /**
   7152      * <p>The camera device faces the same direction as the device's screen.</p>
   7153      */
   7154     ACAMERA_LENS_FACING_FRONT                                        = 0,
   7155 
   7156     /**
   7157      * <p>The camera device faces the opposite direction as the device's screen.</p>
   7158      */
   7159     ACAMERA_LENS_FACING_BACK                                         = 1,
   7160 
   7161     /**
   7162      * <p>The camera device is an external camera, and has no fixed facing relative to the
   7163      * device's screen.</p>
   7164      */
   7165     ACAMERA_LENS_FACING_EXTERNAL                                     = 2,
   7166 
   7167 } acamera_metadata_enum_android_lens_facing_t;
   7168 
   7169 // ACAMERA_LENS_STATE
   7170 typedef enum acamera_metadata_enum_acamera_lens_state {
   7171     /**
   7172      * <p>The lens parameters (ACAMERA_LENS_FOCAL_LENGTH, ACAMERA_LENS_FOCUS_DISTANCE,
   7173      * ACAMERA_LENS_FILTER_DENSITY and ACAMERA_LENS_APERTURE) are not changing.</p>
   7174      *
   7175      * @see ACAMERA_LENS_APERTURE
   7176      * @see ACAMERA_LENS_FILTER_DENSITY
   7177      * @see ACAMERA_LENS_FOCAL_LENGTH
   7178      * @see ACAMERA_LENS_FOCUS_DISTANCE
   7179      */
   7180     ACAMERA_LENS_STATE_STATIONARY                                    = 0,
   7181 
   7182     /**
   7183      * <p>One or several of the lens parameters
   7184      * (ACAMERA_LENS_FOCAL_LENGTH, ACAMERA_LENS_FOCUS_DISTANCE,
   7185      * ACAMERA_LENS_FILTER_DENSITY or ACAMERA_LENS_APERTURE) is
   7186      * currently changing.</p>
   7187      *
   7188      * @see ACAMERA_LENS_APERTURE
   7189      * @see ACAMERA_LENS_FILTER_DENSITY
   7190      * @see ACAMERA_LENS_FOCAL_LENGTH
   7191      * @see ACAMERA_LENS_FOCUS_DISTANCE
   7192      */
   7193     ACAMERA_LENS_STATE_MOVING                                        = 1,
   7194 
   7195 } acamera_metadata_enum_android_lens_state_t;
   7196 
   7197 // ACAMERA_LENS_POSE_REFERENCE
   7198 typedef enum acamera_metadata_enum_acamera_lens_pose_reference {
   7199     /**
   7200      * <p>The value of ACAMERA_LENS_POSE_TRANSLATION is relative to the optical center of
   7201      * the largest camera device facing the same direction as this camera.</p>
   7202      * <p>This is the default value for API levels before Android P.</p>
   7203      *
   7204      * @see ACAMERA_LENS_POSE_TRANSLATION
   7205      */
   7206     ACAMERA_LENS_POSE_REFERENCE_PRIMARY_CAMERA                       = 0,
   7207 
   7208     /**
   7209      * <p>The value of ACAMERA_LENS_POSE_TRANSLATION is relative to the position of the
   7210      * primary gyroscope of this Android device.</p>
   7211      *
   7212      * @see ACAMERA_LENS_POSE_TRANSLATION
   7213      */
   7214     ACAMERA_LENS_POSE_REFERENCE_GYROSCOPE                            = 1,
   7215 
   7216 } acamera_metadata_enum_android_lens_pose_reference_t;
   7217 
   7218 
   7219 // ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION
   7220 typedef enum acamera_metadata_enum_acamera_lens_info_focus_distance_calibration {
   7221     /**
   7222      * <p>The lens focus distance is not accurate, and the units used for
   7223      * ACAMERA_LENS_FOCUS_DISTANCE do not correspond to any physical units.</p>
   7224      * <p>Setting the lens to the same focus distance on separate occasions may
   7225      * result in a different real focus distance, depending on factors such
   7226      * as the orientation of the device, the age of the focusing mechanism,
   7227      * and the device temperature. The focus distance value will still be
   7228      * in the range of <code>[0, ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE]</code>, where 0
   7229      * represents the farthest focus.</p>
   7230      *
   7231      * @see ACAMERA_LENS_FOCUS_DISTANCE
   7232      * @see ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE
   7233      */
   7234     ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION_UNCALIBRATED        = 0,
   7235 
   7236     /**
   7237      * <p>The lens focus distance is measured in diopters.</p>
   7238      * <p>However, setting the lens to the same focus distance
   7239      * on separate occasions may result in a different real
   7240      * focus distance, depending on factors such as the
   7241      * orientation of the device, the age of the focusing
   7242      * mechanism, and the device temperature.</p>
   7243      */
   7244     ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION_APPROXIMATE         = 1,
   7245 
   7246     /**
   7247      * <p>The lens focus distance is measured in diopters, and
   7248      * is calibrated.</p>
   7249      * <p>The lens mechanism is calibrated so that setting the
   7250      * same focus distance is repeatable on multiple
   7251      * occasions with good accuracy, and the focus distance
   7252      * corresponds to the real physical distance to the plane
   7253      * of best focus.</p>
   7254      */
   7255     ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION_CALIBRATED          = 2,
   7256 
   7257 } acamera_metadata_enum_android_lens_info_focus_distance_calibration_t;
   7258 
   7259 
   7260 // ACAMERA_NOISE_REDUCTION_MODE
   7261 typedef enum acamera_metadata_enum_acamera_noise_reduction_mode {
   7262     /**
   7263      * <p>No noise reduction is applied.</p>
   7264      */
   7265     ACAMERA_NOISE_REDUCTION_MODE_OFF                                 = 0,
   7266 
   7267     /**
   7268      * <p>Noise reduction is applied without reducing frame rate relative to sensor
   7269      * output. It may be the same as OFF if noise reduction will reduce frame rate
   7270      * relative to sensor.</p>
   7271      */
   7272     ACAMERA_NOISE_REDUCTION_MODE_FAST                                = 1,
   7273 
   7274     /**
   7275      * <p>High-quality noise reduction is applied, at the cost of possibly reduced frame
   7276      * rate relative to sensor output.</p>
   7277      */
   7278     ACAMERA_NOISE_REDUCTION_MODE_HIGH_QUALITY                        = 2,
   7279 
   7280     /**
   7281      * <p>MINIMAL noise reduction is applied without reducing frame rate relative to
   7282      * sensor output. </p>
   7283      */
   7284     ACAMERA_NOISE_REDUCTION_MODE_MINIMAL                             = 3,
   7285 
   7286     /**
   7287      * <p>Noise reduction is applied at different levels for different output streams,
   7288      * based on resolution. Streams at maximum recording resolution (see {@link ACameraDevice_createCaptureSession })
   7289      * or below have noise reduction applied, while higher-resolution streams have MINIMAL (if
   7290      * supported) or no noise reduction applied (if MINIMAL is not supported.) The degree of
   7291      * noise reduction for low-resolution streams is tuned so that frame rate is not impacted,
   7292      * and the quality is equal to or better than FAST (since it is only applied to
   7293      * lower-resolution outputs, quality may improve from FAST).</p>
   7294      * <p>This mode is intended to be used by applications operating in a zero-shutter-lag mode
   7295      * with YUV or PRIVATE reprocessing, where the application continuously captures
   7296      * high-resolution intermediate buffers into a circular buffer, from which a final image is
   7297      * produced via reprocessing when a user takes a picture.  For such a use case, the
   7298      * high-resolution buffers must not have noise reduction applied to maximize efficiency of
   7299      * preview and to avoid over-applying noise filtering when reprocessing, while
   7300      * low-resolution buffers (used for recording or preview, generally) need noise reduction
   7301      * applied for reasonable preview quality.</p>
   7302      * <p>This mode is guaranteed to be supported by devices that support either the
   7303      * YUV_REPROCESSING or PRIVATE_REPROCESSING capabilities
   7304      * (ACAMERA_REQUEST_AVAILABLE_CAPABILITIES lists either of those capabilities) and it will
   7305      * be the default mode for CAMERA3_TEMPLATE_ZERO_SHUTTER_LAG template.</p>
   7306      *
   7307      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   7308      */
   7309     ACAMERA_NOISE_REDUCTION_MODE_ZERO_SHUTTER_LAG                    = 4,
   7310 
   7311 } acamera_metadata_enum_android_noise_reduction_mode_t;
   7312 
   7313 
   7314 
   7315 // ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   7316 typedef enum acamera_metadata_enum_acamera_request_available_capabilities {
   7317     /**
   7318      * <p>The minimal set of capabilities that every camera
   7319      * device (regardless of ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL)
   7320      * supports.</p>
   7321      * <p>This capability is listed by all normal devices, and
   7322      * indicates that the camera device has a feature set
   7323      * that's comparable to the baseline requirements for the
   7324      * older android.hardware.Camera API.</p>
   7325      * <p>Devices with the DEPTH_OUTPUT capability might not list this
   7326      * capability, indicating that they support only depth measurement,
   7327      * not standard color output.</p>
   7328      *
   7329      * @see ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL
   7330      */
   7331     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_BACKWARD_COMPATIBLE       = 0,
   7332 
   7333     /**
   7334      * <p>The camera device can be manually controlled (3A algorithms such
   7335      * as auto-exposure, and auto-focus can be bypassed).
   7336      * The camera device supports basic manual control of the sensor image
   7337      * acquisition related stages. This means the following controls are
   7338      * guaranteed to be supported:</p>
   7339      * <ul>
   7340      * <li>Manual frame duration control<ul>
   7341      * <li>ACAMERA_SENSOR_FRAME_DURATION</li>
   7342      * <li>ACAMERA_SENSOR_INFO_MAX_FRAME_DURATION</li>
   7343      * </ul>
   7344      * </li>
   7345      * <li>Manual exposure control<ul>
   7346      * <li>ACAMERA_SENSOR_EXPOSURE_TIME</li>
   7347      * <li>ACAMERA_SENSOR_INFO_EXPOSURE_TIME_RANGE</li>
   7348      * </ul>
   7349      * </li>
   7350      * <li>Manual sensitivity control<ul>
   7351      * <li>ACAMERA_SENSOR_SENSITIVITY</li>
   7352      * <li>ACAMERA_SENSOR_INFO_SENSITIVITY_RANGE</li>
   7353      * </ul>
   7354      * </li>
   7355      * <li>Manual lens control (if the lens is adjustable)<ul>
   7356      * <li>ACAMERA_LENS_*</li>
   7357      * </ul>
   7358      * </li>
   7359      * <li>Manual flash control (if a flash unit is present)<ul>
   7360      * <li>ACAMERA_FLASH_*</li>
   7361      * </ul>
   7362      * </li>
   7363      * <li>Manual black level locking<ul>
   7364      * <li>ACAMERA_BLACK_LEVEL_LOCK</li>
   7365      * </ul>
   7366      * </li>
   7367      * <li>Auto exposure lock<ul>
   7368      * <li>ACAMERA_CONTROL_AE_LOCK</li>
   7369      * </ul>
   7370      * </li>
   7371      * </ul>
   7372      * <p>If any of the above 3A algorithms are enabled, then the camera
   7373      * device will accurately report the values applied by 3A in the
   7374      * result.</p>
   7375      * <p>A given camera device may also support additional manual sensor controls,
   7376      * but this capability only covers the above list of controls.</p>
   7377      * <p>If this is supported, android.scaler.streamConfigurationMap will
   7378      * additionally return a min frame duration that is greater than
   7379      * zero for each supported size-format combination.</p>
   7380      * <p>For camera devices with LOGICAL_MULTI_CAMERA capability, when the underlying active
   7381      * physical camera switches, exposureTime, sensitivity, and lens properties may change
   7382      * even if AE/AF is locked. However, the overall auto exposure and auto focus experience
   7383      * for users will be consistent. Refer to LOGICAL_MULTI_CAMERA capability for details.</p>
   7384      *
   7385      * @see ACAMERA_BLACK_LEVEL_LOCK
   7386      * @see ACAMERA_CONTROL_AE_LOCK
   7387      * @see ACAMERA_SENSOR_EXPOSURE_TIME
   7388      * @see ACAMERA_SENSOR_FRAME_DURATION
   7389      * @see ACAMERA_SENSOR_INFO_EXPOSURE_TIME_RANGE
   7390      * @see ACAMERA_SENSOR_INFO_MAX_FRAME_DURATION
   7391      * @see ACAMERA_SENSOR_INFO_SENSITIVITY_RANGE
   7392      * @see ACAMERA_SENSOR_SENSITIVITY
   7393      */
   7394     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_MANUAL_SENSOR             = 1,
   7395 
   7396     /**
   7397      * <p>The camera device post-processing stages can be manually controlled.
   7398      * The camera device supports basic manual control of the image post-processing
   7399      * stages. This means the following controls are guaranteed to be supported:</p>
   7400      * <ul>
   7401      * <li>
   7402      * <p>Manual tonemap control</p>
   7403      * <ul>
   7404      * <li>android.tonemap.curve</li>
   7405      * <li>ACAMERA_TONEMAP_MODE</li>
   7406      * <li>ACAMERA_TONEMAP_MAX_CURVE_POINTS</li>
   7407      * <li>ACAMERA_TONEMAP_GAMMA</li>
   7408      * <li>ACAMERA_TONEMAP_PRESET_CURVE</li>
   7409      * </ul>
   7410      * </li>
   7411      * <li>
   7412      * <p>Manual white balance control</p>
   7413      * <ul>
   7414      * <li>ACAMERA_COLOR_CORRECTION_TRANSFORM</li>
   7415      * <li>ACAMERA_COLOR_CORRECTION_GAINS</li>
   7416      * </ul>
   7417      * </li>
   7418      * <li>Manual lens shading map control<ul>
   7419      * <li>ACAMERA_SHADING_MODE</li>
   7420      * <li>ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE</li>
   7421      * <li>ACAMERA_STATISTICS_LENS_SHADING_MAP</li>
   7422      * <li>ACAMERA_LENS_INFO_SHADING_MAP_SIZE</li>
   7423      * </ul>
   7424      * </li>
   7425      * <li>Manual aberration correction control (if aberration correction is supported)<ul>
   7426      * <li>ACAMERA_COLOR_CORRECTION_ABERRATION_MODE</li>
   7427      * <li>ACAMERA_COLOR_CORRECTION_AVAILABLE_ABERRATION_MODES</li>
   7428      * </ul>
   7429      * </li>
   7430      * <li>Auto white balance lock<ul>
   7431      * <li>ACAMERA_CONTROL_AWB_LOCK</li>
   7432      * </ul>
   7433      * </li>
   7434      * </ul>
   7435      * <p>If auto white balance is enabled, then the camera device
   7436      * will accurately report the values applied by AWB in the result.</p>
   7437      * <p>A given camera device may also support additional post-processing
   7438      * controls, but this capability only covers the above list of controls.</p>
   7439      * <p>For camera devices with LOGICAL_MULTI_CAMERA capability, when underlying active
   7440      * physical camera switches, tonemap, white balance, and shading map may change even if
   7441      * awb is locked. However, the overall post-processing experience for users will be
   7442      * consistent. Refer to LOGICAL_MULTI_CAMERA capability for details.</p>
   7443      *
   7444      * @see ACAMERA_COLOR_CORRECTION_ABERRATION_MODE
   7445      * @see ACAMERA_COLOR_CORRECTION_AVAILABLE_ABERRATION_MODES
   7446      * @see ACAMERA_COLOR_CORRECTION_GAINS
   7447      * @see ACAMERA_COLOR_CORRECTION_TRANSFORM
   7448      * @see ACAMERA_CONTROL_AWB_LOCK
   7449      * @see ACAMERA_LENS_INFO_SHADING_MAP_SIZE
   7450      * @see ACAMERA_SHADING_MODE
   7451      * @see ACAMERA_STATISTICS_LENS_SHADING_MAP
   7452      * @see ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE
   7453      * @see ACAMERA_TONEMAP_GAMMA
   7454      * @see ACAMERA_TONEMAP_MAX_CURVE_POINTS
   7455      * @see ACAMERA_TONEMAP_MODE
   7456      * @see ACAMERA_TONEMAP_PRESET_CURVE
   7457      */
   7458     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_MANUAL_POST_PROCESSING    = 2,
   7459 
   7460     /**
   7461      * <p>The camera device supports outputting RAW buffers and
   7462      * metadata for interpreting them.</p>
   7463      * <p>Devices supporting the RAW capability allow both for
   7464      * saving DNG files, and for direct application processing of
   7465      * raw sensor images.</p>
   7466      * <ul>
   7467      * <li>RAW_SENSOR is supported as an output format.</li>
   7468      * <li>The maximum available resolution for RAW_SENSOR streams
   7469      *   will match either the value in
   7470      *   ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE or
   7471      *   ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE.</li>
   7472      * <li>All DNG-related optional metadata entries are provided
   7473      *   by the camera device.</li>
   7474      * </ul>
   7475      *
   7476      * @see ACAMERA_SENSOR_INFO_PIXEL_ARRAY_SIZE
   7477      * @see ACAMERA_SENSOR_INFO_PRE_CORRECTION_ACTIVE_ARRAY_SIZE
   7478      */
   7479     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_RAW                       = 3,
   7480 
   7481     /**
   7482      * <p>The camera device supports accurately reporting the sensor settings for many of
   7483      * the sensor controls while the built-in 3A algorithm is running.  This allows
   7484      * reporting of sensor settings even when these settings cannot be manually changed.</p>
   7485      * <p>The values reported for the following controls are guaranteed to be available
   7486      * in the CaptureResult, including when 3A is enabled:</p>
   7487      * <ul>
   7488      * <li>Exposure control<ul>
   7489      * <li>ACAMERA_SENSOR_EXPOSURE_TIME</li>
   7490      * </ul>
   7491      * </li>
   7492      * <li>Sensitivity control<ul>
   7493      * <li>ACAMERA_SENSOR_SENSITIVITY</li>
   7494      * </ul>
   7495      * </li>
   7496      * <li>Lens controls (if the lens is adjustable)<ul>
   7497      * <li>ACAMERA_LENS_FOCUS_DISTANCE</li>
   7498      * <li>ACAMERA_LENS_APERTURE</li>
   7499      * </ul>
   7500      * </li>
   7501      * </ul>
   7502      * <p>This capability is a subset of the MANUAL_SENSOR control capability, and will
   7503      * always be included if the MANUAL_SENSOR capability is available.</p>
   7504      *
   7505      * @see ACAMERA_LENS_APERTURE
   7506      * @see ACAMERA_LENS_FOCUS_DISTANCE
   7507      * @see ACAMERA_SENSOR_EXPOSURE_TIME
   7508      * @see ACAMERA_SENSOR_SENSITIVITY
   7509      */
   7510     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_READ_SENSOR_SETTINGS      = 5,
   7511 
   7512     /**
   7513      * <p>The camera device supports capturing high-resolution images at &gt;= 20 frames per
   7514      * second, in at least the uncompressed YUV format, when post-processing settings are
   7515      * set to FAST. Additionally, all image resolutions less than 24 megapixels can be
   7516      * captured at &gt;= 10 frames per second. Here, 'high resolution' means at least 8
   7517      * megapixels, or the maximum resolution of the device, whichever is smaller.</p>
   7518      * <p>More specifically, this means that at least one output {@link AIMAGE_FORMAT_YUV_420_888 } size listed in
   7519      * {@link ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS }
   7520      * is larger or equal to the 'high resolution' defined above, and can be captured at at
   7521      * least 20 fps.  For the largest {@link AIMAGE_FORMAT_YUV_420_888 } size listed in
   7522      * {@link ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS },
   7523      * camera device can capture this size for at least 10 frames per second if the size is
   7524      * less than 24 megapixels. Also the ACAMERA_CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES entry
   7525      * lists at least one FPS range where the minimum FPS is &gt;= 1 / minimumFrameDuration
   7526      * for the largest YUV_420_888 size.</p>
   7527      * <p>If the device supports the {@link AIMAGE_FORMAT_RAW10 }, {@link AIMAGE_FORMAT_RAW12 }, {@link AIMAGE_FORMAT_Y8 }, then those can also be
   7528      * captured at the same rate as the maximum-size YUV_420_888 resolution is.</p>
   7529      * <p>In addition, the ACAMERA_SYNC_MAX_LATENCY field is guaranted to have a value between 0
   7530      * and 4, inclusive. ACAMERA_CONTROL_AE_LOCK_AVAILABLE and ACAMERA_CONTROL_AWB_LOCK_AVAILABLE
   7531      * are also guaranteed to be <code>true</code> so burst capture with these two locks ON yields
   7532      * consistent image output.</p>
   7533      *
   7534      * @see ACAMERA_CONTROL_AE_AVAILABLE_TARGET_FPS_RANGES
   7535      * @see ACAMERA_CONTROL_AE_LOCK_AVAILABLE
   7536      * @see ACAMERA_CONTROL_AWB_LOCK_AVAILABLE
   7537      * @see ACAMERA_SYNC_MAX_LATENCY
   7538      */
   7539     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_BURST_CAPTURE             = 6,
   7540 
   7541     /**
   7542      * <p>The camera device can produce depth measurements from its field of view.</p>
   7543      * <p>This capability requires the camera device to support the following:</p>
   7544      * <ul>
   7545      * <li>{@link AIMAGE_FORMAT_DEPTH16 } is supported as
   7546      *   an output format.</li>
   7547      * <li>{@link AIMAGE_FORMAT_DEPTH_POINT_CLOUD } is
   7548      *   optionally supported as an output format.</li>
   7549      * <li>This camera device, and all camera devices with the same ACAMERA_LENS_FACING, will
   7550      *   list the following calibration metadata entries in both {@link ACameraManager_getCameraCharacteristics }
   7551      *   and {@link ACameraCaptureSession_captureCallback_result }:<ul>
   7552      * <li>ACAMERA_LENS_POSE_TRANSLATION</li>
   7553      * <li>ACAMERA_LENS_POSE_ROTATION</li>
   7554      * <li>ACAMERA_LENS_INTRINSIC_CALIBRATION</li>
   7555      * <li>ACAMERA_LENS_DISTORTION</li>
   7556      * </ul>
   7557      * </li>
   7558      * <li>The ACAMERA_DEPTH_DEPTH_IS_EXCLUSIVE entry is listed by this device.</li>
   7559      * <li>As of Android P, the ACAMERA_LENS_POSE_REFERENCE entry is listed by this device.</li>
   7560      * <li>A LIMITED camera with only the DEPTH_OUTPUT capability does not have to support
   7561      *   normal YUV_420_888, Y8, JPEG, and PRIV-format outputs. It only has to support the
   7562      *   DEPTH16 format.</li>
   7563      * </ul>
   7564      * <p>Generally, depth output operates at a slower frame rate than standard color capture,
   7565      * so the DEPTH16 and DEPTH_POINT_CLOUD formats will commonly have a stall duration that
   7566      * should be accounted for (see {@link ACAMERA_DEPTH_AVAILABLE_DEPTH_STALL_DURATIONS }).
   7567      * On a device that supports both depth and color-based output, to enable smooth preview,
   7568      * using a repeating burst is recommended, where a depth-output target is only included
   7569      * once every N frames, where N is the ratio between preview output rate and depth output
   7570      * rate, including depth stall time.</p>
   7571      *
   7572      * @see ACAMERA_DEPTH_DEPTH_IS_EXCLUSIVE
   7573      * @see ACAMERA_LENS_DISTORTION
   7574      * @see ACAMERA_LENS_FACING
   7575      * @see ACAMERA_LENS_INTRINSIC_CALIBRATION
   7576      * @see ACAMERA_LENS_POSE_REFERENCE
   7577      * @see ACAMERA_LENS_POSE_ROTATION
   7578      * @see ACAMERA_LENS_POSE_TRANSLATION
   7579      */
   7580     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_DEPTH_OUTPUT              = 8,
   7581 
   7582     /**
   7583      * <p>The camera device supports the MOTION_TRACKING value for
   7584      * ACAMERA_CONTROL_CAPTURE_INTENT, which limits maximum exposure time to 20 ms.</p>
   7585      * <p>This limits the motion blur of capture images, resulting in better image tracking
   7586      * results for use cases such as image stabilization or augmented reality.</p>
   7587      *
   7588      * @see ACAMERA_CONTROL_CAPTURE_INTENT
   7589      */
   7590     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_MOTION_TRACKING           = 10,
   7591 
   7592     /**
   7593      * <p>The camera device is a logical camera backed by two or more physical cameras.</p>
   7594      * <p>In API level 28, the physical cameras must also be exposed to the application via
   7595      * <a href="https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#getCameraIdList">CameraManager#getCameraIdList</a>.</p>
   7596      * <p>Starting from API level 29, some or all physical cameras may not be independently
   7597      * exposed to the application, in which case the physical camera IDs will not be
   7598      * available in <a href="https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#getCameraIdList">CameraManager#getCameraIdList</a>. But the
   7599      * application can still query the physical cameras' characteristics by calling
   7600      * <a href="https://developer.android.com/reference/android/hardware/camera2/CameraManager.html#getCameraCharacteristics">CameraManager#getCameraCharacteristics</a>. Additionally,
   7601      * if a physical camera is hidden from camera ID list, the mandatory stream combinations
   7602      * for that physical camera must be supported through the logical camera using physical
   7603      * streams.</p>
   7604      * <p>Combinations of logical and physical streams, or physical streams from different
   7605      * physical cameras are not guaranteed. However, if the camera device supports
   7606      * {@link ACameraDevice_isSessionConfigurationSupported },
   7607      * application must be able to query whether a stream combination involving physical
   7608      * streams is supported by calling
   7609      * {@link ACameraDevice_isSessionConfigurationSupported }.</p>
   7610      * <p>Camera application shouldn't assume that there are at most 1 rear camera and 1 front
   7611      * camera in the system. For an application that switches between front and back cameras,
   7612      * the recommendation is to switch between the first rear camera and the first front
   7613      * camera in the list of supported camera devices.</p>
   7614      * <p>This capability requires the camera device to support the following:</p>
   7615      * <ul>
   7616      * <li>The IDs of underlying physical cameras are returned via
   7617      *   <a href="https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html#getPhysicalCameraIds">CameraCharacteristics#getPhysicalCameraIds</a>.</li>
   7618      * <li>This camera device must list static metadata
   7619      *   ACAMERA_LOGICAL_MULTI_CAMERA_SENSOR_SYNC_TYPE in
   7620      *   <a href="https://developer.android.com/reference/android/hardware/camera2/CameraCharacteristics.html">CameraCharacteristics</a>.</li>
   7621      * <li>The underlying physical cameras' static metadata must list the following entries,
   7622      *   so that the application can correlate pixels from the physical streams:<ul>
   7623      * <li>ACAMERA_LENS_POSE_REFERENCE</li>
   7624      * <li>ACAMERA_LENS_POSE_ROTATION</li>
   7625      * <li>ACAMERA_LENS_POSE_TRANSLATION</li>
   7626      * <li>ACAMERA_LENS_INTRINSIC_CALIBRATION</li>
   7627      * <li>ACAMERA_LENS_DISTORTION</li>
   7628      * </ul>
   7629      * </li>
   7630      * <li>The SENSOR_INFO_TIMESTAMP_SOURCE of the logical device and physical devices must be
   7631      *   the same.</li>
   7632      * <li>The logical camera must be LIMITED or higher device.</li>
   7633      * </ul>
   7634      * <p>A logical camera device's dynamic metadata may contain
   7635      * ACAMERA_LOGICAL_MULTI_CAMERA_ACTIVE_PHYSICAL_ID to notify the application of the current
   7636      * active physical camera Id. An active physical camera is the physical camera from which
   7637      * the logical camera's main image data outputs (YUV or RAW) and metadata come from.
   7638      * In addition, this serves as an indication which physical camera is used to output to
   7639      * a RAW stream, or in case only physical cameras support RAW, which physical RAW stream
   7640      * the application should request.</p>
   7641      * <p>Logical camera's static metadata tags below describe the default active physical
   7642      * camera. An active physical camera is default if it's used when application directly
   7643      * uses requests built from a template. All templates will default to the same active
   7644      * physical camera.</p>
   7645      * <ul>
   7646      * <li>ACAMERA_SENSOR_INFO_SENSITIVITY_RANGE</li>
   7647      * <li>ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT</li>
   7648      * <li>ACAMERA_SENSOR_INFO_EXPOSURE_TIME_RANGE</li>
   7649      * <li>ACAMERA_SENSOR_INFO_MAX_FRAME_DURATION</li>
   7650      * <li>ACAMERA_SENSOR_INFO_PHYSICAL_SIZE</li>
   7651      * <li>ACAMERA_SENSOR_INFO_WHITE_LEVEL</li>
   7652      * <li>ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED</li>
   7653      * <li>ACAMERA_SENSOR_REFERENCE_ILLUMINANT1</li>
   7654      * <li>ACAMERA_SENSOR_REFERENCE_ILLUMINANT2</li>
   7655      * <li>ACAMERA_SENSOR_CALIBRATION_TRANSFORM1</li>
   7656      * <li>ACAMERA_SENSOR_CALIBRATION_TRANSFORM2</li>
   7657      * <li>ACAMERA_SENSOR_COLOR_TRANSFORM1</li>
   7658      * <li>ACAMERA_SENSOR_COLOR_TRANSFORM2</li>
   7659      * <li>ACAMERA_SENSOR_FORWARD_MATRIX1</li>
   7660      * <li>ACAMERA_SENSOR_FORWARD_MATRIX2</li>
   7661      * <li>ACAMERA_SENSOR_BLACK_LEVEL_PATTERN</li>
   7662      * <li>ACAMERA_SENSOR_MAX_ANALOG_SENSITIVITY</li>
   7663      * <li>ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS</li>
   7664      * <li>ACAMERA_SENSOR_AVAILABLE_TEST_PATTERN_MODES</li>
   7665      * <li>ACAMERA_LENS_INFO_HYPERFOCAL_DISTANCE</li>
   7666      * <li>ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE</li>
   7667      * <li>ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION</li>
   7668      * <li>ACAMERA_LENS_POSE_ROTATION</li>
   7669      * <li>ACAMERA_LENS_POSE_TRANSLATION</li>
   7670      * <li>ACAMERA_LENS_INTRINSIC_CALIBRATION</li>
   7671      * <li>ACAMERA_LENS_POSE_REFERENCE</li>
   7672      * <li>ACAMERA_LENS_DISTORTION</li>
   7673      * </ul>
   7674      * <p>The field of view of all non-RAW physical streams must be the same or as close as
   7675      * possible to that of non-RAW logical streams. If the requested FOV is outside of the
   7676      * range supported by the physical camera, the physical stream for that physical camera
   7677      * will use either the maximum or minimum scaler crop region, depending on which one is
   7678      * closer to the requested FOV. For example, for a logical camera with wide-tele lens
   7679      * configuration where the wide lens is the default, if the logical camera's crop region
   7680      * is set to maximum, the physical stream for the tele lens will be configured to its
   7681      * maximum crop region. On the other hand, if the logical camera has a normal-wide lens
   7682      * configuration where the normal lens is the default, when the logical camera's crop
   7683      * region is set to maximum, the FOV of the logical streams will be that of the normal
   7684      * lens. The FOV of the physical streams for the wide lens will be the same as the
   7685      * logical stream, by making the crop region smaller than its active array size to
   7686      * compensate for the smaller focal length.</p>
   7687      * <p>Even if the underlying physical cameras have different RAW characteristics (such as
   7688      * size or CFA pattern), a logical camera can still advertise RAW capability. In this
   7689      * case, when the application configures a RAW stream, the camera device will make sure
   7690      * the active physical camera will remain active to ensure consistent RAW output
   7691      * behavior, and not switch to other physical cameras.</p>
   7692      * <p>The capture request and result metadata tags required for backward compatible camera
   7693      * functionalities will be solely based on the logical camera capabiltity. On the other
   7694      * hand, the use of manual capture controls (sensor or post-processing) with a
   7695      * logical camera may result in unexpected behavior when the HAL decides to switch
   7696      * between physical cameras with different characteristics under the hood. For example,
   7697      * when the application manually sets exposure time and sensitivity while zooming in,
   7698      * the brightness of the camera images may suddenly change because HAL switches from one
   7699      * physical camera to the other.</p>
   7700      *
   7701      * @see ACAMERA_LENS_DISTORTION
   7702      * @see ACAMERA_LENS_INFO_FOCUS_DISTANCE_CALIBRATION
   7703      * @see ACAMERA_LENS_INFO_HYPERFOCAL_DISTANCE
   7704      * @see ACAMERA_LENS_INFO_MINIMUM_FOCUS_DISTANCE
   7705      * @see ACAMERA_LENS_INTRINSIC_CALIBRATION
   7706      * @see ACAMERA_LENS_POSE_REFERENCE
   7707      * @see ACAMERA_LENS_POSE_ROTATION
   7708      * @see ACAMERA_LENS_POSE_TRANSLATION
   7709      * @see ACAMERA_LOGICAL_MULTI_CAMERA_ACTIVE_PHYSICAL_ID
   7710      * @see ACAMERA_LOGICAL_MULTI_CAMERA_SENSOR_SYNC_TYPE
   7711      * @see ACAMERA_SENSOR_AVAILABLE_TEST_PATTERN_MODES
   7712      * @see ACAMERA_SENSOR_BLACK_LEVEL_PATTERN
   7713      * @see ACAMERA_SENSOR_CALIBRATION_TRANSFORM1
   7714      * @see ACAMERA_SENSOR_CALIBRATION_TRANSFORM2
   7715      * @see ACAMERA_SENSOR_COLOR_TRANSFORM1
   7716      * @see ACAMERA_SENSOR_COLOR_TRANSFORM2
   7717      * @see ACAMERA_SENSOR_FORWARD_MATRIX1
   7718      * @see ACAMERA_SENSOR_FORWARD_MATRIX2
   7719      * @see ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT
   7720      * @see ACAMERA_SENSOR_INFO_EXPOSURE_TIME_RANGE
   7721      * @see ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED
   7722      * @see ACAMERA_SENSOR_INFO_MAX_FRAME_DURATION
   7723      * @see ACAMERA_SENSOR_INFO_PHYSICAL_SIZE
   7724      * @see ACAMERA_SENSOR_INFO_SENSITIVITY_RANGE
   7725      * @see ACAMERA_SENSOR_INFO_WHITE_LEVEL
   7726      * @see ACAMERA_SENSOR_MAX_ANALOG_SENSITIVITY
   7727      * @see ACAMERA_SENSOR_OPTICAL_BLACK_REGIONS
   7728      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT1
   7729      * @see ACAMERA_SENSOR_REFERENCE_ILLUMINANT2
   7730      */
   7731     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_LOGICAL_MULTI_CAMERA      = 11,
   7732 
   7733     /**
   7734      * <p>The camera device is a monochrome camera that doesn't contain a color filter array,
   7735      * and for YUV_420_888 stream, the pixel values on U and V planes are all 128.</p>
   7736      * <p>A MONOCHROME camera must support the guaranteed stream combinations required for
   7737      * its device level and capabilities. Additionally, if the monochrome camera device
   7738      * supports Y8 format, all mandatory stream combination requirements related to {@link AIMAGE_FORMAT_YUV_420_888 YUV_420_888} apply
   7739      * to {@link AIMAGE_FORMAT_Y8 Y8} as well. There are no
   7740      * mandatory stream combination requirements with regard to
   7741      * {@link AIMAGE_FORMAT_Y8 Y8} for Bayer camera devices.</p>
   7742      * <p>Starting from Android Q, the SENSOR_INFO_COLOR_FILTER_ARRANGEMENT of a MONOCHROME
   7743      * camera will be either MONO or NIR.</p>
   7744      */
   7745     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_MONOCHROME                = 12,
   7746 
   7747     /**
   7748      * <p>The camera device is capable of writing image data into a region of memory
   7749      * inaccessible to Android userspace or the Android kernel, and only accessible to
   7750      * trusted execution environments (TEE).</p>
   7751      */
   7752     ACAMERA_REQUEST_AVAILABLE_CAPABILITIES_SECURE_IMAGE_DATA         = 13,
   7753 
   7754 } acamera_metadata_enum_android_request_available_capabilities_t;
   7755 
   7756 
   7757 // ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS
   7758 typedef enum acamera_metadata_enum_acamera_scaler_available_stream_configurations {
   7759     ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_OUTPUT            = 0,
   7760 
   7761     ACAMERA_SCALER_AVAILABLE_STREAM_CONFIGURATIONS_INPUT             = 1,
   7762 
   7763 } acamera_metadata_enum_android_scaler_available_stream_configurations_t;
   7764 
   7765 // ACAMERA_SCALER_CROPPING_TYPE
   7766 typedef enum acamera_metadata_enum_acamera_scaler_cropping_type {
   7767     /**
   7768      * <p>The camera device only supports centered crop regions.</p>
   7769      */
   7770     ACAMERA_SCALER_CROPPING_TYPE_CENTER_ONLY                         = 0,
   7771 
   7772     /**
   7773      * <p>The camera device supports arbitrarily chosen crop regions.</p>
   7774      */
   7775     ACAMERA_SCALER_CROPPING_TYPE_FREEFORM                            = 1,
   7776 
   7777 } acamera_metadata_enum_android_scaler_cropping_type_t;
   7778 
   7779 // ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS
   7780 typedef enum acamera_metadata_enum_acamera_scaler_available_recommended_stream_configurations {
   7781     /**
   7782      * <p>Preview must only include non-stalling processed stream configurations with
   7783      * output formats like
   7784      * {@link AIMAGE_FORMAT_YUV_420_888 },
   7785      * {@link AIMAGE_FORMAT_PRIVATE }, etc.</p>
   7786      */
   7787     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS_PREVIEW
   7788                                                                       = 0x0,
   7789 
   7790     /**
   7791      * <p>Video record must include stream configurations that match the advertised
   7792      * supported media profiles <a href="https://developer.android.com/reference/android/media/CamcorderProfile.html">CamcorderProfile</a> with
   7793      * IMPLEMENTATION_DEFINED format.</p>
   7794      */
   7795     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS_RECORD
   7796                                                                       = 0x1,
   7797 
   7798     /**
   7799      * <p>Video snapshot must include stream configurations at least as big as
   7800      * the maximum RECORD resolutions and only with
   7801      * {@link AIMAGE_FORMAT_JPEG JPEG output format}.
   7802      * Additionally the configurations shouldn't cause preview glitches and also be able to
   7803      * run at 30 fps.</p>
   7804      */
   7805     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS_VIDEO_SNAPSHOT
   7806                                                                       = 0x2,
   7807 
   7808     /**
   7809      * <p>Recommended snapshot stream configurations must include at least one with
   7810      * size close to ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE and
   7811      * {@link AIMAGE_FORMAT_JPEG JPEG output format}.
   7812      * Taking into account restrictions on aspect ratio, alignment etc. the area of the
   7813      * maximum suggested size shouldnt be less than 97% of the sensor array size area.</p>
   7814      *
   7815      * @see ACAMERA_SENSOR_INFO_ACTIVE_ARRAY_SIZE
   7816      */
   7817     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS_SNAPSHOT
   7818                                                                       = 0x3,
   7819 
   7820     /**
   7821      * <p>If supported, recommended input stream configurations must only be advertised with
   7822      * ZSL along with other processed and/or stalling output formats.</p>
   7823      */
   7824     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS_ZSL   = 0x4,
   7825 
   7826     /**
   7827      * <p>If supported, recommended raw stream configurations must only include RAW based
   7828      * output formats.</p>
   7829      */
   7830     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS_RAW   = 0x5,
   7831 
   7832     /**
   7833      * <p>If supported, the recommended low latency stream configurations must have
   7834      * end-to-end latency that does not exceed 200 ms. under standard operating conditions
   7835      * (reasonable light levels, not loaded system) and using template
   7836      * TEMPLATE_STILL_CAPTURE. This is primarily for listing configurations for the
   7837      * {@link AIMAGE_FORMAT_JPEG JPEG output format}
   7838      * however other supported output formats can be added as well.</p>
   7839      */
   7840     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS_LOW_LATENCY_SNAPSHOT
   7841                                                                       = 0x6,
   7842 
   7843     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS_PUBLIC_END
   7844                                                                       = 0x7,
   7845 
   7846     /**
   7847      * <p>Vendor defined use cases. These depend on the vendor implementation.</p>
   7848      */
   7849     ACAMERA_SCALER_AVAILABLE_RECOMMENDED_STREAM_CONFIGURATIONS_VENDOR_START
   7850                                                                       = 0x18,
   7851 
   7852 } acamera_metadata_enum_android_scaler_available_recommended_stream_configurations_t;
   7853 
   7854 
   7855 // ACAMERA_SENSOR_REFERENCE_ILLUMINANT1
   7856 typedef enum acamera_metadata_enum_acamera_sensor_reference_illuminant1 {
   7857     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_DAYLIGHT                    = 1,
   7858 
   7859     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_FLUORESCENT                 = 2,
   7860 
   7861     /**
   7862      * <p>Incandescent light</p>
   7863      */
   7864     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_TUNGSTEN                    = 3,
   7865 
   7866     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_FLASH                       = 4,
   7867 
   7868     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_FINE_WEATHER                = 9,
   7869 
   7870     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_CLOUDY_WEATHER              = 10,
   7871 
   7872     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_SHADE                       = 11,
   7873 
   7874     /**
   7875      * <p>D 5700 - 7100K</p>
   7876      */
   7877     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_DAYLIGHT_FLUORESCENT        = 12,
   7878 
   7879     /**
   7880      * <p>N 4600 - 5400K</p>
   7881      */
   7882     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_DAY_WHITE_FLUORESCENT       = 13,
   7883 
   7884     /**
   7885      * <p>W 3900 - 4500K</p>
   7886      */
   7887     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_COOL_WHITE_FLUORESCENT      = 14,
   7888 
   7889     /**
   7890      * <p>WW 3200 - 3700K</p>
   7891      */
   7892     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_WHITE_FLUORESCENT           = 15,
   7893 
   7894     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_STANDARD_A                  = 17,
   7895 
   7896     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_STANDARD_B                  = 18,
   7897 
   7898     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_STANDARD_C                  = 19,
   7899 
   7900     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_D55                         = 20,
   7901 
   7902     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_D65                         = 21,
   7903 
   7904     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_D75                         = 22,
   7905 
   7906     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_D50                         = 23,
   7907 
   7908     ACAMERA_SENSOR_REFERENCE_ILLUMINANT1_ISO_STUDIO_TUNGSTEN         = 24,
   7909 
   7910 } acamera_metadata_enum_android_sensor_reference_illuminant1_t;
   7911 
   7912 // ACAMERA_SENSOR_TEST_PATTERN_MODE
   7913 typedef enum acamera_metadata_enum_acamera_sensor_test_pattern_mode {
   7914     /**
   7915      * <p>No test pattern mode is used, and the camera
   7916      * device returns captures from the image sensor.</p>
   7917      * <p>This is the default if the key is not set.</p>
   7918      */
   7919     ACAMERA_SENSOR_TEST_PATTERN_MODE_OFF                             = 0,
   7920 
   7921     /**
   7922      * <p>Each pixel in <code>[R, G_even, G_odd, B]</code> is replaced by its
   7923      * respective color channel provided in
   7924      * ACAMERA_SENSOR_TEST_PATTERN_DATA.</p>
   7925      * <p>For example:</p>
   7926      * <pre><code>android.testPatternData = [0, 0xFFFFFFFF, 0xFFFFFFFF, 0]
   7927      * </code></pre>
   7928      * <p>All green pixels are 100% green. All red/blue pixels are black.</p>
   7929      * <pre><code>android.testPatternData = [0xFFFFFFFF, 0, 0xFFFFFFFF, 0]
   7930      * </code></pre>
   7931      * <p>All red pixels are 100% red. Only the odd green pixels
   7932      * are 100% green. All blue pixels are 100% black.</p>
   7933      *
   7934      * @see ACAMERA_SENSOR_TEST_PATTERN_DATA
   7935      */
   7936     ACAMERA_SENSOR_TEST_PATTERN_MODE_SOLID_COLOR                     = 1,
   7937 
   7938     /**
   7939      * <p>All pixel data is replaced with an 8-bar color pattern.</p>
   7940      * <p>The vertical bars (left-to-right) are as follows:</p>
   7941      * <ul>
   7942      * <li>100% white</li>
   7943      * <li>yellow</li>
   7944      * <li>cyan</li>
   7945      * <li>green</li>
   7946      * <li>magenta</li>
   7947      * <li>red</li>
   7948      * <li>blue</li>
   7949      * <li>black</li>
   7950      * </ul>
   7951      * <p>In general the image would look like the following:</p>
   7952      * <pre><code>W Y C G M R B K
   7953      * W Y C G M R B K
   7954      * W Y C G M R B K
   7955      * W Y C G M R B K
   7956      * W Y C G M R B K
   7957      * . . . . . . . .
   7958      * . . . . . . . .
   7959      * . . . . . . . .
   7960      *
   7961      * (B = Blue, K = Black)
   7962      * </code></pre>
   7963      * <p>Each bar should take up 1/8 of the sensor pixel array width.
   7964      * When this is not possible, the bar size should be rounded
   7965      * down to the nearest integer and the pattern can repeat
   7966      * on the right side.</p>
   7967      * <p>Each bar's height must always take up the full sensor
   7968      * pixel array height.</p>
   7969      * <p>Each pixel in this test pattern must be set to either
   7970      * 0% intensity or 100% intensity.</p>
   7971      */
   7972     ACAMERA_SENSOR_TEST_PATTERN_MODE_COLOR_BARS                      = 2,
   7973 
   7974     /**
   7975      * <p>The test pattern is similar to COLOR_BARS, except that
   7976      * each bar should start at its specified color at the top,
   7977      * and fade to gray at the bottom.</p>
   7978      * <p>Furthermore each bar is further subdivided into a left and
   7979      * right half. The left half should have a smooth gradient,
   7980      * and the right half should have a quantized gradient.</p>
   7981      * <p>In particular, the right half's should consist of blocks of the
   7982      * same color for 1/16th active sensor pixel array width.</p>
   7983      * <p>The least significant bits in the quantized gradient should
   7984      * be copied from the most significant bits of the smooth gradient.</p>
   7985      * <p>The height of each bar should always be a multiple of 128.
   7986      * When this is not the case, the pattern should repeat at the bottom
   7987      * of the image.</p>
   7988      */
   7989     ACAMERA_SENSOR_TEST_PATTERN_MODE_COLOR_BARS_FADE_TO_GRAY         = 3,
   7990 
   7991     /**
   7992      * <p>All pixel data is replaced by a pseudo-random sequence
   7993      * generated from a PN9 512-bit sequence (typically implemented
   7994      * in hardware with a linear feedback shift register).</p>
   7995      * <p>The generator should be reset at the beginning of each frame,
   7996      * and thus each subsequent raw frame with this test pattern should
   7997      * be exactly the same as the last.</p>
   7998      */
   7999     ACAMERA_SENSOR_TEST_PATTERN_MODE_PN9                             = 4,
   8000 
   8001     /**
   8002      * <p>The first custom test pattern. All custom patterns that are
   8003      * available only on this camera device are at least this numeric
   8004      * value.</p>
   8005      * <p>All of the custom test patterns will be static
   8006      * (that is the raw image must not vary from frame to frame).</p>
   8007      */
   8008     ACAMERA_SENSOR_TEST_PATTERN_MODE_CUSTOM1                         = 256,
   8009 
   8010 } acamera_metadata_enum_android_sensor_test_pattern_mode_t;
   8011 
   8012 
   8013 // ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT
   8014 typedef enum acamera_metadata_enum_acamera_sensor_info_color_filter_arrangement {
   8015     ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT_RGGB                = 0,
   8016 
   8017     ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT_GRBG                = 1,
   8018 
   8019     ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT_GBRG                = 2,
   8020 
   8021     ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT_BGGR                = 3,
   8022 
   8023     /**
   8024      * <p>Sensor is not Bayer; output has 3 16-bit
   8025      * values for each pixel, instead of just 1 16-bit value
   8026      * per pixel.</p>
   8027      */
   8028     ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT_RGB                 = 4,
   8029 
   8030     /**
   8031      * <p>Sensor doesn't have any Bayer color filter.
   8032      * Such sensor captures visible light in monochrome. The exact weighting and
   8033      * wavelengths captured is not specified, but generally only includes the visible
   8034      * frequencies. This value implies a MONOCHROME camera.</p>
   8035      */
   8036     ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT_MONO                = 5,
   8037 
   8038     /**
   8039      * <p>Sensor has a near infrared filter capturing light with wavelength between
   8040      * roughly 750nm and 1400nm, and the same filter covers the whole sensor array. This
   8041      * value implies a MONOCHROME camera.</p>
   8042      */
   8043     ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT_NIR                 = 6,
   8044 
   8045 } acamera_metadata_enum_android_sensor_info_color_filter_arrangement_t;
   8046 
   8047 // ACAMERA_SENSOR_INFO_TIMESTAMP_SOURCE
   8048 typedef enum acamera_metadata_enum_acamera_sensor_info_timestamp_source {
   8049     /**
   8050      * <p>Timestamps from ACAMERA_SENSOR_TIMESTAMP are in nanoseconds and monotonic,
   8051      * but can not be compared to timestamps from other subsystems
   8052      * (e.g. accelerometer, gyro etc.), or other instances of the same or different
   8053      * camera devices in the same system. Timestamps between streams and results for
   8054      * a single camera instance are comparable, and the timestamps for all buffers
   8055      * and the result metadata generated by a single capture are identical.</p>
   8056      *
   8057      * @see ACAMERA_SENSOR_TIMESTAMP
   8058      */
   8059     ACAMERA_SENSOR_INFO_TIMESTAMP_SOURCE_UNKNOWN                     = 0,
   8060 
   8061     /**
   8062      * <p>Timestamps from ACAMERA_SENSOR_TIMESTAMP are in the same timebase as
   8063      * <a href="https://developer.android.com/reference/android/os/SystemClock.html#elapsedRealtimeNanos">SystemClock#elapsedRealtimeNanos</a>,
   8064      * and they can be compared to other timestamps using that base.</p>
   8065      *
   8066      * @see ACAMERA_SENSOR_TIMESTAMP
   8067      */
   8068     ACAMERA_SENSOR_INFO_TIMESTAMP_SOURCE_REALTIME                    = 1,
   8069 
   8070 } acamera_metadata_enum_android_sensor_info_timestamp_source_t;
   8071 
   8072 // ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED
   8073 typedef enum acamera_metadata_enum_acamera_sensor_info_lens_shading_applied {
   8074     ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED_FALSE                   = 0,
   8075 
   8076     ACAMERA_SENSOR_INFO_LENS_SHADING_APPLIED_TRUE                    = 1,
   8077 
   8078 } acamera_metadata_enum_android_sensor_info_lens_shading_applied_t;
   8079 
   8080 
   8081 // ACAMERA_SHADING_MODE
   8082 typedef enum acamera_metadata_enum_acamera_shading_mode {
   8083     /**
   8084      * <p>No lens shading correction is applied.</p>
   8085      */
   8086     ACAMERA_SHADING_MODE_OFF                                         = 0,
   8087 
   8088     /**
   8089      * <p>Apply lens shading corrections, without slowing
   8090      * frame rate relative to sensor raw output</p>
   8091      */
   8092     ACAMERA_SHADING_MODE_FAST                                        = 1,
   8093 
   8094     /**
   8095      * <p>Apply high-quality lens shading correction, at the
   8096      * cost of possibly reduced frame rate.</p>
   8097      */
   8098     ACAMERA_SHADING_MODE_HIGH_QUALITY                                = 2,
   8099 
   8100 } acamera_metadata_enum_android_shading_mode_t;
   8101 
   8102 
   8103 // ACAMERA_STATISTICS_FACE_DETECT_MODE
   8104 typedef enum acamera_metadata_enum_acamera_statistics_face_detect_mode {
   8105     /**
   8106      * <p>Do not include face detection statistics in capture
   8107      * results.</p>
   8108      */
   8109     ACAMERA_STATISTICS_FACE_DETECT_MODE_OFF                          = 0,
   8110 
   8111     /**
   8112      * <p>Return face rectangle and confidence values only.</p>
   8113      */
   8114     ACAMERA_STATISTICS_FACE_DETECT_MODE_SIMPLE                       = 1,
   8115 
   8116     /**
   8117      * <p>Return all face
   8118      * metadata.</p>
   8119      * <p>In this mode, face rectangles, scores, landmarks, and face IDs are all valid.</p>
   8120      */
   8121     ACAMERA_STATISTICS_FACE_DETECT_MODE_FULL                         = 2,
   8122 
   8123 } acamera_metadata_enum_android_statistics_face_detect_mode_t;
   8124 
   8125 // ACAMERA_STATISTICS_HOT_PIXEL_MAP_MODE
   8126 typedef enum acamera_metadata_enum_acamera_statistics_hot_pixel_map_mode {
   8127     /**
   8128      * <p>Hot pixel map production is disabled.</p>
   8129      */
   8130     ACAMERA_STATISTICS_HOT_PIXEL_MAP_MODE_OFF                        = 0,
   8131 
   8132     /**
   8133      * <p>Hot pixel map production is enabled.</p>
   8134      */
   8135     ACAMERA_STATISTICS_HOT_PIXEL_MAP_MODE_ON                         = 1,
   8136 
   8137 } acamera_metadata_enum_android_statistics_hot_pixel_map_mode_t;
   8138 
   8139 // ACAMERA_STATISTICS_SCENE_FLICKER
   8140 typedef enum acamera_metadata_enum_acamera_statistics_scene_flicker {
   8141     /**
   8142      * <p>The camera device does not detect any flickering illumination
   8143      * in the current scene.</p>
   8144      */
   8145     ACAMERA_STATISTICS_SCENE_FLICKER_NONE                            = 0,
   8146 
   8147     /**
   8148      * <p>The camera device detects illumination flickering at 50Hz
   8149      * in the current scene.</p>
   8150      */
   8151     ACAMERA_STATISTICS_SCENE_FLICKER_50HZ                            = 1,
   8152 
   8153     /**
   8154      * <p>The camera device detects illumination flickering at 60Hz
   8155      * in the current scene.</p>
   8156      */
   8157     ACAMERA_STATISTICS_SCENE_FLICKER_60HZ                            = 2,
   8158 
   8159 } acamera_metadata_enum_android_statistics_scene_flicker_t;
   8160 
   8161 // ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE
   8162 typedef enum acamera_metadata_enum_acamera_statistics_lens_shading_map_mode {
   8163     /**
   8164      * <p>Do not include a lens shading map in the capture result.</p>
   8165      */
   8166     ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE_OFF                     = 0,
   8167 
   8168     /**
   8169      * <p>Include a lens shading map in the capture result.</p>
   8170      */
   8171     ACAMERA_STATISTICS_LENS_SHADING_MAP_MODE_ON                      = 1,
   8172 
   8173 } acamera_metadata_enum_android_statistics_lens_shading_map_mode_t;
   8174 
   8175 // ACAMERA_STATISTICS_OIS_DATA_MODE
   8176 typedef enum acamera_metadata_enum_acamera_statistics_ois_data_mode {
   8177     /**
   8178      * <p>Do not include OIS data in the capture result.</p>
   8179      */
   8180     ACAMERA_STATISTICS_OIS_DATA_MODE_OFF                             = 0,
   8181 
   8182     /**
   8183      * <p>Include OIS data in the capture result.</p>
   8184      * <p>ACAMERA_STATISTICS_OIS_TIMESTAMPS, ACAMERA_STATISTICS_OIS_X_SHIFTS,
   8185      * and ACAMERA_STATISTICS_OIS_Y_SHIFTS provide OIS data in the output result metadata.</p>
   8186      *
   8187      * @see ACAMERA_STATISTICS_OIS_TIMESTAMPS
   8188      * @see ACAMERA_STATISTICS_OIS_X_SHIFTS
   8189      * @see ACAMERA_STATISTICS_OIS_Y_SHIFTS
   8190      */
   8191     ACAMERA_STATISTICS_OIS_DATA_MODE_ON                              = 1,
   8192 
   8193 } acamera_metadata_enum_android_statistics_ois_data_mode_t;
   8194 
   8195 
   8196 
   8197 // ACAMERA_TONEMAP_MODE
   8198 typedef enum acamera_metadata_enum_acamera_tonemap_mode {
   8199     /**
   8200      * <p>Use the tone mapping curve specified in
   8201      * the ACAMERA_TONEMAPCURVE_* entries.</p>
   8202      * <p>All color enhancement and tonemapping must be disabled, except
   8203      * for applying the tonemapping curve specified by
   8204      * android.tonemap.curve.</p>
   8205      * <p>Must not slow down frame rate relative to raw
   8206      * sensor output.</p>
   8207      */
   8208     ACAMERA_TONEMAP_MODE_CONTRAST_CURVE                              = 0,
   8209 
   8210     /**
   8211      * <p>Advanced gamma mapping and color enhancement may be applied, without
   8212      * reducing frame rate compared to raw sensor output.</p>
   8213      */
   8214     ACAMERA_TONEMAP_MODE_FAST                                        = 1,
   8215 
   8216     /**
   8217      * <p>High-quality gamma mapping and color enhancement will be applied, at
   8218      * the cost of possibly reduced frame rate compared to raw sensor output.</p>
   8219      */
   8220     ACAMERA_TONEMAP_MODE_HIGH_QUALITY                                = 2,
   8221 
   8222     /**
   8223      * <p>Use the gamma value specified in ACAMERA_TONEMAP_GAMMA to peform
   8224      * tonemapping.</p>
   8225      * <p>All color enhancement and tonemapping must be disabled, except
   8226      * for applying the tonemapping curve specified by ACAMERA_TONEMAP_GAMMA.</p>
   8227      * <p>Must not slow down frame rate relative to raw sensor output.</p>
   8228      *
   8229      * @see ACAMERA_TONEMAP_GAMMA
   8230      */
   8231     ACAMERA_TONEMAP_MODE_GAMMA_VALUE                                 = 3,
   8232 
   8233     /**
   8234      * <p>Use the preset tonemapping curve specified in
   8235      * ACAMERA_TONEMAP_PRESET_CURVE to peform tonemapping.</p>
   8236      * <p>All color enhancement and tonemapping must be disabled, except
   8237      * for applying the tonemapping curve specified by
   8238      * ACAMERA_TONEMAP_PRESET_CURVE.</p>
   8239      * <p>Must not slow down frame rate relative to raw sensor output.</p>
   8240      *
   8241      * @see ACAMERA_TONEMAP_PRESET_CURVE
   8242      */
   8243     ACAMERA_TONEMAP_MODE_PRESET_CURVE                                = 4,
   8244 
   8245 } acamera_metadata_enum_android_tonemap_mode_t;
   8246 
   8247 // ACAMERA_TONEMAP_PRESET_CURVE
   8248 typedef enum acamera_metadata_enum_acamera_tonemap_preset_curve {
   8249     /**
   8250      * <p>Tonemapping curve is defined by sRGB</p>
   8251      */
   8252     ACAMERA_TONEMAP_PRESET_CURVE_SRGB                                = 0,
   8253 
   8254     /**
   8255      * <p>Tonemapping curve is defined by ITU-R BT.709</p>
   8256      */
   8257     ACAMERA_TONEMAP_PRESET_CURVE_REC709                              = 1,
   8258 
   8259 } acamera_metadata_enum_android_tonemap_preset_curve_t;
   8260 
   8261 
   8262 
   8263 // ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL
   8264 typedef enum acamera_metadata_enum_acamera_info_supported_hardware_level {
   8265     /**
   8266      * <p>This camera device does not have enough capabilities to qualify as a <code>FULL</code> device or
   8267      * better.</p>
   8268      * <p>Only the stream configurations listed in the <code>LEGACY</code> and <code>LIMITED</code> tables in the
   8269      * {@link ACameraDevice_createCaptureSession createCaptureSession} documentation are guaranteed to be supported.</p>
   8270      * <p>All <code>LIMITED</code> devices support the <code>BACKWARDS_COMPATIBLE</code> capability, indicating basic
   8271      * support for color image capture. The only exception is that the device may
   8272      * alternatively support only the <code>DEPTH_OUTPUT</code> capability, if it can only output depth
   8273      * measurements and not color images.</p>
   8274      * <p><code>LIMITED</code> devices and above require the use of ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
   8275      * to lock exposure metering (and calculate flash power, for cameras with flash) before
   8276      * capturing a high-quality still image.</p>
   8277      * <p>A <code>LIMITED</code> device that only lists the <code>BACKWARDS_COMPATIBLE</code> capability is only
   8278      * required to support full-automatic operation and post-processing (<code>OFF</code> is not
   8279      * supported for ACAMERA_CONTROL_AE_MODE, ACAMERA_CONTROL_AF_MODE, or
   8280      * ACAMERA_CONTROL_AWB_MODE)</p>
   8281      * <p>Additional capabilities may optionally be supported by a <code>LIMITED</code>-level device, and
   8282      * can be checked for in ACAMERA_REQUEST_AVAILABLE_CAPABILITIES.</p>
   8283      *
   8284      * @see ACAMERA_CONTROL_AE_MODE
   8285      * @see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
   8286      * @see ACAMERA_CONTROL_AF_MODE
   8287      * @see ACAMERA_CONTROL_AWB_MODE
   8288      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   8289      */
   8290     ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL_LIMITED                    = 0,
   8291 
   8292     /**
   8293      * <p>This camera device is capable of supporting advanced imaging applications.</p>
   8294      * <p>The stream configurations listed in the <code>FULL</code>, <code>LEGACY</code> and <code>LIMITED</code> tables in the
   8295      * {@link ACameraDevice_createCaptureSession createCaptureSession} documentation are guaranteed to be supported.</p>
   8296      * <p>A <code>FULL</code> device will support below capabilities:</p>
   8297      * <ul>
   8298      * <li><code>BURST_CAPTURE</code> capability (ACAMERA_REQUEST_AVAILABLE_CAPABILITIES contains
   8299      *   <code>BURST_CAPTURE</code>)</li>
   8300      * <li>Per frame control (ACAMERA_SYNC_MAX_LATENCY <code>==</code> PER_FRAME_CONTROL)</li>
   8301      * <li>Manual sensor control (ACAMERA_REQUEST_AVAILABLE_CAPABILITIES contains <code>MANUAL_SENSOR</code>)</li>
   8302      * <li>Manual post-processing control (ACAMERA_REQUEST_AVAILABLE_CAPABILITIES contains
   8303      *   <code>MANUAL_POST_PROCESSING</code>)</li>
   8304      * <li>The required exposure time range defined in ACAMERA_SENSOR_INFO_EXPOSURE_TIME_RANGE</li>
   8305      * <li>The required maxFrameDuration defined in ACAMERA_SENSOR_INFO_MAX_FRAME_DURATION</li>
   8306      * </ul>
   8307      * <p>Note:
   8308      * Pre-API level 23, FULL devices also supported arbitrary cropping region
   8309      * (ACAMERA_SCALER_CROPPING_TYPE <code>== FREEFORM</code>); this requirement was relaxed in API level
   8310      * 23, and <code>FULL</code> devices may only support <code>CENTERED</code> cropping.</p>
   8311      *
   8312      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   8313      * @see ACAMERA_SCALER_CROPPING_TYPE
   8314      * @see ACAMERA_SENSOR_INFO_EXPOSURE_TIME_RANGE
   8315      * @see ACAMERA_SENSOR_INFO_MAX_FRAME_DURATION
   8316      * @see ACAMERA_SYNC_MAX_LATENCY
   8317      */
   8318     ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL_FULL                       = 1,
   8319 
   8320     /**
   8321      * <p>This camera device is running in backward compatibility mode.</p>
   8322      * <p>Only the stream configurations listed in the <code>LEGACY</code> table in the {@link ACameraDevice_createCaptureSession createCaptureSession} documentation are supported.</p>
   8323      * <p>A <code>LEGACY</code> device does not support per-frame control, manual sensor control, manual
   8324      * post-processing, arbitrary cropping regions, and has relaxed performance constraints.
   8325      * No additional capabilities beyond <code>BACKWARD_COMPATIBLE</code> will ever be listed by a
   8326      * <code>LEGACY</code> device in ACAMERA_REQUEST_AVAILABLE_CAPABILITIES.</p>
   8327      * <p>In addition, the ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER is not functional on <code>LEGACY</code>
   8328      * devices. Instead, every request that includes a JPEG-format output target is treated
   8329      * as triggering a still capture, internally executing a precapture trigger.  This may
   8330      * fire the flash for flash power metering during precapture, and then fire the flash
   8331      * for the final capture, if a flash is available on the device and the AE mode is set to
   8332      * enable the flash.</p>
   8333      * <p>Devices that initially shipped with Android version <a href="https://developer.android.com/reference/android/os/Build/VERSION_CODES.html#Q">Q</a> or newer will not include any LEGACY-level devices.</p>
   8334      *
   8335      * @see ACAMERA_CONTROL_AE_PRECAPTURE_TRIGGER
   8336      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   8337      */
   8338     ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL_LEGACY                     = 2,
   8339 
   8340     /**
   8341      * <p>This camera device is capable of YUV reprocessing and RAW data capture, in addition to
   8342      * FULL-level capabilities.</p>
   8343      * <p>The stream configurations listed in the <code>LEVEL_3</code>, <code>RAW</code>, <code>FULL</code>, <code>LEGACY</code> and
   8344      * <code>LIMITED</code> tables in the {@link ACameraDevice_createCaptureSession createCaptureSession} documentation are guaranteed to be supported.</p>
   8345      * <p>The following additional capabilities are guaranteed to be supported:</p>
   8346      * <ul>
   8347      * <li><code>YUV_REPROCESSING</code> capability (ACAMERA_REQUEST_AVAILABLE_CAPABILITIES contains
   8348      *   <code>YUV_REPROCESSING</code>)</li>
   8349      * <li><code>RAW</code> capability (ACAMERA_REQUEST_AVAILABLE_CAPABILITIES contains
   8350      *   <code>RAW</code>)</li>
   8351      * </ul>
   8352      *
   8353      * @see ACAMERA_REQUEST_AVAILABLE_CAPABILITIES
   8354      */
   8355     ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL_3                          = 3,
   8356 
   8357     /**
   8358      * <p>This camera device is backed by an external camera connected to this Android device.</p>
   8359      * <p>The device has capability identical to a LIMITED level device, with the following
   8360      * exceptions:</p>
   8361      * <ul>
   8362      * <li>The device may not report lens/sensor related information such as<ul>
   8363      * <li>ACAMERA_LENS_FOCAL_LENGTH</li>
   8364      * <li>ACAMERA_LENS_INFO_HYPERFOCAL_DISTANCE</li>
   8365      * <li>ACAMERA_SENSOR_INFO_PHYSICAL_SIZE</li>
   8366      * <li>ACAMERA_SENSOR_INFO_WHITE_LEVEL</li>
   8367      * <li>ACAMERA_SENSOR_BLACK_LEVEL_PATTERN</li>
   8368      * <li>ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT</li>
   8369      * <li>ACAMERA_SENSOR_ROLLING_SHUTTER_SKEW</li>
   8370      * </ul>
   8371      * </li>
   8372      * <li>The device will report 0 for ACAMERA_SENSOR_ORIENTATION</li>
   8373      * <li>The device has less guarantee on stable framerate, as the framerate partly depends
   8374      *   on the external camera being used.</li>
   8375      * </ul>
   8376      *
   8377      * @see ACAMERA_LENS_FOCAL_LENGTH
   8378      * @see ACAMERA_LENS_INFO_HYPERFOCAL_DISTANCE
   8379      * @see ACAMERA_SENSOR_BLACK_LEVEL_PATTERN
   8380      * @see ACAMERA_SENSOR_INFO_COLOR_FILTER_ARRANGEMENT
   8381      * @see ACAMERA_SENSOR_INFO_PHYSICAL_SIZE
   8382      * @see ACAMERA_SENSOR_INFO_WHITE_LEVEL
   8383      * @see ACAMERA_SENSOR_ORIENTATION
   8384      * @see ACAMERA_SENSOR_ROLLING_SHUTTER_SKEW
   8385      */
   8386     ACAMERA_INFO_SUPPORTED_HARDWARE_LEVEL_EXTERNAL                   = 4,
   8387 
   8388 } acamera_metadata_enum_android_info_supported_hardware_level_t;
   8389 
   8390 
   8391 // ACAMERA_BLACK_LEVEL_LOCK
   8392 typedef enum acamera_metadata_enum_acamera_black_level_lock {
   8393     ACAMERA_BLACK_LEVEL_LOCK_OFF                                     = 0,
   8394 
   8395     ACAMERA_BLACK_LEVEL_LOCK_ON                                      = 1,
   8396 
   8397 } acamera_metadata_enum_android_black_level_lock_t;
   8398 
   8399 
   8400 // ACAMERA_SYNC_FRAME_NUMBER
   8401 typedef enum acamera_metadata_enum_acamera_sync_frame_number {
   8402     /**
   8403      * <p>The current result is not yet fully synchronized to any request.</p>
   8404      * <p>Synchronization is in progress, and reading metadata from this
   8405      * result may include a mix of data that have taken effect since the
   8406      * last synchronization time.</p>
   8407      * <p>In some future result, within ACAMERA_SYNC_MAX_LATENCY frames,
   8408      * this value will update to the actual frame number frame number
   8409      * the result is guaranteed to be synchronized to (as long as the
   8410      * request settings remain constant).</p>
   8411      *
   8412      * @see ACAMERA_SYNC_MAX_LATENCY
   8413      */
   8414     ACAMERA_SYNC_FRAME_NUMBER_CONVERGING                             = -1,
   8415 
   8416     /**
   8417      * <p>The current result's synchronization status is unknown.</p>
   8418      * <p>The result may have already converged, or it may be in
   8419      * progress.  Reading from this result may include some mix
   8420      * of settings from past requests.</p>
   8421      * <p>After a settings change, the new settings will eventually all
   8422      * take effect for the output buffers and results. However, this
   8423      * value will not change when that happens. Altering settings
   8424      * rapidly may provide outcomes using mixes of settings from recent
   8425      * requests.</p>
   8426      * <p>This value is intended primarily for backwards compatibility with
   8427      * the older camera implementations (for android.hardware.Camera).</p>
   8428      */
   8429     ACAMERA_SYNC_FRAME_NUMBER_UNKNOWN                                = -2,
   8430 
   8431 } acamera_metadata_enum_android_sync_frame_number_t;
   8432 
   8433 // ACAMERA_SYNC_MAX_LATENCY
   8434 typedef enum acamera_metadata_enum_acamera_sync_max_latency {
   8435     /**
   8436      * <p>Every frame has the requests immediately applied.</p>
   8437      * <p>Changing controls over multiple requests one after another will
   8438      * produce results that have those controls applied atomically
   8439      * each frame.</p>
   8440      * <p>All FULL capability devices will have this as their maxLatency.</p>
   8441      */
   8442     ACAMERA_SYNC_MAX_LATENCY_PER_FRAME_CONTROL                       = 0,
   8443 
   8444     /**
   8445      * <p>Each new frame has some subset (potentially the entire set)
   8446      * of the past requests applied to the camera settings.</p>
   8447      * <p>By submitting a series of identical requests, the camera device
   8448      * will eventually have the camera settings applied, but it is
   8449      * unknown when that exact point will be.</p>
   8450      * <p>All LEGACY capability devices will have this as their maxLatency.</p>
   8451      */
   8452     ACAMERA_SYNC_MAX_LATENCY_UNKNOWN                                 = -1,
   8453 
   8454 } acamera_metadata_enum_android_sync_max_latency_t;
   8455 
   8456 
   8457 
   8458 // ACAMERA_DEPTH_AVAILABLE_DEPTH_STREAM_CONFIGURATIONS
   8459 typedef enum acamera_metadata_enum_acamera_depth_available_depth_stream_configurations {
   8460     ACAMERA_DEPTH_AVAILABLE_DEPTH_STREAM_CONFIGURATIONS_OUTPUT       = 0,
   8461 
   8462     ACAMERA_DEPTH_AVAILABLE_DEPTH_STREAM_CONFIGURATIONS_INPUT        = 1,
   8463 
   8464 } acamera_metadata_enum_android_depth_available_depth_stream_configurations_t;
   8465 
   8466 // ACAMERA_DEPTH_DEPTH_IS_EXCLUSIVE
   8467 typedef enum acamera_metadata_enum_acamera_depth_depth_is_exclusive {
   8468     ACAMERA_DEPTH_DEPTH_IS_EXCLUSIVE_FALSE                           = 0,
   8469 
   8470     ACAMERA_DEPTH_DEPTH_IS_EXCLUSIVE_TRUE                            = 1,
   8471 
   8472 } acamera_metadata_enum_android_depth_depth_is_exclusive_t;
   8473 
   8474 // ACAMERA_DEPTH_AVAILABLE_DYNAMIC_DEPTH_STREAM_CONFIGURATIONS
   8475 typedef enum acamera_metadata_enum_acamera_depth_available_dynamic_depth_stream_configurations {
   8476     ACAMERA_DEPTH_AVAILABLE_DYNAMIC_DEPTH_STREAM_CONFIGURATIONS_OUTPUT
   8477                                                                       = 0,
   8478 
   8479     ACAMERA_DEPTH_AVAILABLE_DYNAMIC_DEPTH_STREAM_CONFIGURATIONS_INPUT
   8480                                                                       = 1,
   8481 
   8482 } acamera_metadata_enum_android_depth_available_dynamic_depth_stream_configurations_t;
   8483 
   8484 
   8485 // ACAMERA_LOGICAL_MULTI_CAMERA_SENSOR_SYNC_TYPE
   8486 typedef enum acamera_metadata_enum_acamera_logical_multi_camera_sensor_sync_type {
   8487     /**
   8488      * <p>A software mechanism is used to synchronize between the physical cameras. As a result,
   8489      * the timestamp of an image from a physical stream is only an approximation of the
   8490      * image sensor start-of-exposure time.</p>
   8491      */
   8492     ACAMERA_LOGICAL_MULTI_CAMERA_SENSOR_SYNC_TYPE_APPROXIMATE        = 0,
   8493 
   8494     /**
   8495      * <p>The camera device supports frame timestamp synchronization at the hardware level,
   8496      * and the timestamp of a physical stream image accurately reflects its
   8497      * start-of-exposure time.</p>
   8498      */
   8499     ACAMERA_LOGICAL_MULTI_CAMERA_SENSOR_SYNC_TYPE_CALIBRATED         = 1,
   8500 
   8501 } acamera_metadata_enum_android_logical_multi_camera_sensor_sync_type_t;
   8502 
   8503 
   8504 // ACAMERA_DISTORTION_CORRECTION_MODE
   8505 typedef enum acamera_metadata_enum_acamera_distortion_correction_mode {
   8506     /**
   8507      * <p>No distortion correction is applied.</p>
   8508      */
   8509     ACAMERA_DISTORTION_CORRECTION_MODE_OFF                           = 0,
   8510 
   8511     /**
   8512      * <p>Lens distortion correction is applied without reducing frame rate
   8513      * relative to sensor output. It may be the same as OFF if distortion correction would
   8514      * reduce frame rate relative to sensor.</p>
   8515      */
   8516     ACAMERA_DISTORTION_CORRECTION_MODE_FAST                          = 1,
   8517 
   8518     /**
   8519      * <p>High-quality distortion correction is applied, at the cost of
   8520      * possibly reduced frame rate relative to sensor output.</p>
   8521      */
   8522     ACAMERA_DISTORTION_CORRECTION_MODE_HIGH_QUALITY                  = 2,
   8523 
   8524 } acamera_metadata_enum_android_distortion_correction_mode_t;
   8525 
   8526 
   8527 // ACAMERA_HEIC_AVAILABLE_HEIC_STREAM_CONFIGURATIONS
   8528 typedef enum acamera_metadata_enum_acamera_heic_available_heic_stream_configurations {
   8529     ACAMERA_HEIC_AVAILABLE_HEIC_STREAM_CONFIGURATIONS_OUTPUT         = 0,
   8530 
   8531     ACAMERA_HEIC_AVAILABLE_HEIC_STREAM_CONFIGURATIONS_INPUT          = 1,
   8532 
   8533 } acamera_metadata_enum_android_heic_available_heic_stream_configurations_t;
   8534 
   8535 
   8536 
   8537 #endif /* __ANDROID_API__ >= 24 */
   8538 
   8539 __END_DECLS
   8540 
   8541 #endif /* _NDK_CAMERA_METADATA_TAGS_H */
   8542 
   8543 /** @} */
   8544