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      1 /*
      2  * Copyright (C) 2011 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  * Contains implementation of a class EmulatedCamera that encapsulates
     19  * functionality common to all emulated cameras ("fake", "webcam", "video file",
     20  * etc.). Instances of this class (for each emulated camera) are created during
     21  * the construction of the EmulatedCameraFactory instance. This class serves as
     22  * an entry point for all camera API calls that defined by camera_device_ops_t
     23  * API.
     24  */
     25 
     26 #define LOG_NDEBUG 0
     27 #define LOG_TAG "EmulatedCamera_Camera"
     28 #include <cutils/log.h>
     29 #include <ui/Rect.h>
     30 #include "EmulatedCamera.h"
     31 //#include "EmulatedFakeCameraDevice.h"
     32 #include "Converters.h"
     33 
     34 /* Defines whether we should trace parameter changes. */
     35 #define DEBUG_PARAM 1
     36 
     37 namespace android {
     38 
     39 #if DEBUG_PARAM
     40 /* Calculates and logs parameter changes.
     41  * Param:
     42  *  current - Current set of camera parameters.
     43  *  new_par - String representation of new parameters.
     44  */
     45 static void PrintParamDiff(const CameraParameters& current, const char* new_par);
     46 #else
     47 #define PrintParamDiff(current, new_par)   (void(0))
     48 #endif  /* DEBUG_PARAM */
     49 
     50 /* A helper routine that adds a value to the camera parameter.
     51  * Param:
     52  *  param - Camera parameter to add a value to.
     53  *  val - Value to add.
     54  * Return:
     55  *  A new string containing parameter with the added value on success, or NULL on
     56  *  a failure. If non-NULL string is returned, the caller is responsible for
     57  *  freeing it with 'free'.
     58  */
     59 static char* AddValue(const char* param, const char* val);
     60 
     61 EmulatedCamera::EmulatedCamera(int cameraId,
     62                                struct hw_module_t* module)
     63         : EmulatedBaseCamera(cameraId,
     64                 HARDWARE_DEVICE_API_VERSION(1, 0),
     65                 &common,
     66                 module),
     67           mPreviewWindow(),
     68           mCallbackNotifier()
     69 {
     70     /* camera_device v1 fields. */
     71     common.close = EmulatedCamera::close;
     72     ops = &mDeviceOps;
     73     priv = this;
     74 }
     75 
     76 EmulatedCamera::~EmulatedCamera()
     77 {
     78 }
     79 
     80 /****************************************************************************
     81  * Public API
     82  ***************************************************************************/
     83 
     84 status_t EmulatedCamera::Initialize()
     85 {
     86     /* Preview formats supported by this HAL. */
     87     char preview_formats[1024];
     88     snprintf(preview_formats, sizeof(preview_formats), "%s,%s,%s",
     89              CameraParameters::PIXEL_FORMAT_YUV420SP,
     90              CameraParameters::PIXEL_FORMAT_YUV420P,
     91              CameraParameters::PIXEL_FORMAT_RGBA8888);
     92 
     93     /*
     94      * Fake required parameters.
     95      */
     96 
     97     mParameters.set(CameraParameters::KEY_SUPPORTED_JPEG_THUMBNAIL_SIZES, "320x240,0x0");
     98 
     99     mParameters.set(CameraParameters::KEY_JPEG_THUMBNAIL_WIDTH, "512");
    100     mParameters.set(CameraParameters::KEY_JPEG_THUMBNAIL_HEIGHT, "384");
    101     mParameters.set(CameraParameters::KEY_JPEG_QUALITY, "90");
    102     mParameters.set(CameraParameters::KEY_FOCAL_LENGTH, "4.31");
    103     mParameters.set(CameraParameters::KEY_HORIZONTAL_VIEW_ANGLE, "54.8");
    104     mParameters.set(CameraParameters::KEY_VERTICAL_VIEW_ANGLE, "42.5");
    105     mParameters.set(CameraParameters::KEY_JPEG_THUMBNAIL_QUALITY, "90");
    106 
    107     /* Preview format settings used here are related to panoramic view only. It's
    108      * not related to the preview window that works only with RGB frames, which
    109      * is explicitly stated when set_buffers_geometry is called on the preview
    110      * window object. */
    111     mParameters.set(CameraParameters::KEY_SUPPORTED_PREVIEW_FORMATS,
    112                     preview_formats);
    113     mParameters.setPreviewFormat(CameraParameters::PIXEL_FORMAT_YUV420SP);
    114 
    115     /* We don't relay on the actual frame rates supported by the camera device,
    116      * since we will emulate them through timeouts in the emulated camera device
    117      * worker thread. */
    118     mParameters.set(CameraParameters::KEY_SUPPORTED_PREVIEW_FRAME_RATES,
    119                     "30,24,20,15,10,5");
    120     mParameters.set(CameraParameters::KEY_SUPPORTED_PREVIEW_FPS_RANGE, "(5,30)");
    121     mParameters.set(CameraParameters::KEY_PREVIEW_FPS_RANGE, "5,30");
    122     mParameters.setPreviewFrameRate(24);
    123 
    124     /* Only PIXEL_FORMAT_YUV420P is accepted by video framework in emulator! */
    125     mParameters.set(CameraParameters::KEY_VIDEO_FRAME_FORMAT,
    126                     CameraParameters::PIXEL_FORMAT_YUV420P);
    127     mParameters.set(CameraParameters::KEY_SUPPORTED_PICTURE_FORMATS,
    128                     CameraParameters::PIXEL_FORMAT_JPEG);
    129     mParameters.setPictureFormat(CameraParameters::PIXEL_FORMAT_JPEG);
    130 
    131     /* Set exposure compensation. */
    132     mParameters.set(CameraParameters::KEY_MAX_EXPOSURE_COMPENSATION, "6");
    133     mParameters.set(CameraParameters::KEY_MIN_EXPOSURE_COMPENSATION, "-6");
    134     mParameters.set(CameraParameters::KEY_EXPOSURE_COMPENSATION_STEP, "0.5");
    135     mParameters.set(CameraParameters::KEY_EXPOSURE_COMPENSATION, "0");
    136 
    137     /* Sets the white balance modes and the device-dependent scale factors. */
    138     char supported_white_balance[1024];
    139     snprintf(supported_white_balance, sizeof(supported_white_balance),
    140              "%s,%s,%s,%s",
    141              CameraParameters::WHITE_BALANCE_AUTO,
    142              CameraParameters::WHITE_BALANCE_INCANDESCENT,
    143              CameraParameters::WHITE_BALANCE_DAYLIGHT,
    144              CameraParameters::WHITE_BALANCE_TWILIGHT);
    145     mParameters.set(CameraParameters::KEY_SUPPORTED_WHITE_BALANCE,
    146                     supported_white_balance);
    147     mParameters.set(CameraParameters::KEY_WHITE_BALANCE,
    148                     CameraParameters::WHITE_BALANCE_AUTO);
    149     getCameraDevice()->initializeWhiteBalanceModes(
    150             CameraParameters::WHITE_BALANCE_AUTO, 1.0f, 1.0f);
    151     getCameraDevice()->initializeWhiteBalanceModes(
    152             CameraParameters::WHITE_BALANCE_INCANDESCENT, 1.38f, 0.60f);
    153     getCameraDevice()->initializeWhiteBalanceModes(
    154             CameraParameters::WHITE_BALANCE_DAYLIGHT, 1.09f, 0.92f);
    155     getCameraDevice()->initializeWhiteBalanceModes(
    156             CameraParameters::WHITE_BALANCE_TWILIGHT, 0.92f, 1.22f);
    157     getCameraDevice()->setWhiteBalanceMode(CameraParameters::WHITE_BALANCE_AUTO);
    158 
    159     /* Not supported features
    160      */
    161     mParameters.set(CameraParameters::KEY_SUPPORTED_FOCUS_MODES,
    162                     CameraParameters::FOCUS_MODE_FIXED);
    163     mParameters.set(CameraParameters::KEY_FOCUS_MODE,
    164                     CameraParameters::FOCUS_MODE_FIXED);
    165 
    166     return NO_ERROR;
    167 }
    168 
    169 void EmulatedCamera::onNextFrameAvailable(const void* frame,
    170                                           nsecs_t timestamp,
    171                                           EmulatedCameraDevice* camera_dev)
    172 {
    173     /* Notify the preview window first. */
    174     mPreviewWindow.onNextFrameAvailable(frame, timestamp, camera_dev);
    175 
    176     /* Notify callback notifier next. */
    177     mCallbackNotifier.onNextFrameAvailable(frame, timestamp, camera_dev);
    178 }
    179 
    180 void EmulatedCamera::onCameraDeviceError(int err)
    181 {
    182     /* Errors are reported through the callback notifier */
    183     mCallbackNotifier.onCameraDeviceError(err);
    184 }
    185 
    186 /****************************************************************************
    187  * Camera API implementation.
    188  ***************************************************************************/
    189 
    190 status_t EmulatedCamera::connectCamera(hw_device_t** device)
    191 {
    192     ALOGV("%s", __FUNCTION__);
    193 
    194     status_t res = EINVAL;
    195     EmulatedCameraDevice* const camera_dev = getCameraDevice();
    196     ALOGE_IF(camera_dev == NULL, "%s: No camera device instance.", __FUNCTION__);
    197 
    198     if (camera_dev != NULL) {
    199         /* Connect to the camera device. */
    200         res = getCameraDevice()->connectDevice();
    201         if (res == NO_ERROR) {
    202             *device = &common;
    203         }
    204     }
    205 
    206     return -res;
    207 }
    208 
    209 status_t EmulatedCamera::closeCamera()
    210 {
    211     ALOGV("%s", __FUNCTION__);
    212 
    213     return cleanupCamera();
    214 }
    215 
    216 status_t EmulatedCamera::getCameraInfo(struct camera_info* info)
    217 {
    218     ALOGV("%s", __FUNCTION__);
    219 
    220     const char* valstr = NULL;
    221 
    222     valstr = mParameters.get(EmulatedCamera::FACING_KEY);
    223     if (valstr != NULL) {
    224         if (strcmp(valstr, EmulatedCamera::FACING_FRONT) == 0) {
    225             info->facing = CAMERA_FACING_FRONT;
    226         }
    227         else if (strcmp(valstr, EmulatedCamera::FACING_BACK) == 0) {
    228             info->facing = CAMERA_FACING_BACK;
    229         }
    230     } else {
    231         info->facing = CAMERA_FACING_BACK;
    232     }
    233 
    234     valstr = mParameters.get(EmulatedCamera::ORIENTATION_KEY);
    235     if (valstr != NULL) {
    236         info->orientation = atoi(valstr);
    237     } else {
    238         info->orientation = 0;
    239     }
    240 
    241     return EmulatedBaseCamera::getCameraInfo(info);
    242 }
    243 
    244 status_t EmulatedCamera::setPreviewWindow(struct preview_stream_ops* window)
    245 {
    246     /* Callback should return a negative errno. */
    247     return -mPreviewWindow.setPreviewWindow(window,
    248                                              mParameters.getPreviewFrameRate());
    249 }
    250 
    251 void EmulatedCamera::setCallbacks(camera_notify_callback notify_cb,
    252                                   camera_data_callback data_cb,
    253                                   camera_data_timestamp_callback data_cb_timestamp,
    254                                   camera_request_memory get_memory,
    255                                   void* user)
    256 {
    257     mCallbackNotifier.setCallbacks(notify_cb, data_cb, data_cb_timestamp,
    258                                     get_memory, user);
    259 }
    260 
    261 void EmulatedCamera::enableMsgType(int32_t msg_type)
    262 {
    263     mCallbackNotifier.enableMessage(msg_type);
    264 }
    265 
    266 void EmulatedCamera::disableMsgType(int32_t msg_type)
    267 {
    268     mCallbackNotifier.disableMessage(msg_type);
    269 }
    270 
    271 int EmulatedCamera::isMsgTypeEnabled(int32_t msg_type)
    272 {
    273     return mCallbackNotifier.isMessageEnabled(msg_type);
    274 }
    275 
    276 status_t EmulatedCamera::startPreview()
    277 {
    278     /* Callback should return a negative errno. */
    279     return -doStartPreview();
    280 }
    281 
    282 void EmulatedCamera::stopPreview()
    283 {
    284     doStopPreview();
    285 }
    286 
    287 int EmulatedCamera::isPreviewEnabled()
    288 {
    289     return mPreviewWindow.isPreviewEnabled();
    290 }
    291 
    292 status_t EmulatedCamera::storeMetaDataInBuffers(int enable)
    293 {
    294     /* Callback should return a negative errno. */
    295     return -mCallbackNotifier.storeMetaDataInBuffers(enable);
    296 }
    297 
    298 status_t EmulatedCamera::startRecording()
    299 {
    300     /* Callback should return a negative errno. */
    301     return -mCallbackNotifier.enableVideoRecording(mParameters.getPreviewFrameRate());
    302 }
    303 
    304 void EmulatedCamera::stopRecording()
    305 {
    306     mCallbackNotifier.disableVideoRecording();
    307 }
    308 
    309 int EmulatedCamera::isRecordingEnabled()
    310 {
    311     return mCallbackNotifier.isVideoRecordingEnabled();
    312 }
    313 
    314 void EmulatedCamera::releaseRecordingFrame(const void* opaque)
    315 {
    316     mCallbackNotifier.releaseRecordingFrame(opaque);
    317 }
    318 
    319 status_t EmulatedCamera::setAutoFocus()
    320 {
    321     ALOGV("%s", __FUNCTION__);
    322 
    323     /* TODO: Future enhancements. */
    324     return NO_ERROR;
    325 }
    326 
    327 status_t EmulatedCamera::cancelAutoFocus()
    328 {
    329     ALOGV("%s", __FUNCTION__);
    330 
    331     /* TODO: Future enhancements. */
    332     return NO_ERROR;
    333 }
    334 
    335 status_t EmulatedCamera::takePicture()
    336 {
    337     ALOGV("%s", __FUNCTION__);
    338 
    339     status_t res;
    340     int width, height;
    341     uint32_t org_fmt;
    342 
    343     /* Collect frame info for the picture. */
    344     mParameters.getPictureSize(&width, &height);
    345     const char* pix_fmt = mParameters.getPictureFormat();
    346     if (strcmp(pix_fmt, CameraParameters::PIXEL_FORMAT_YUV420P) == 0) {
    347         org_fmt = V4L2_PIX_FMT_YUV420;
    348     } else if (strcmp(pix_fmt, CameraParameters::PIXEL_FORMAT_RGBA8888) == 0) {
    349         org_fmt = V4L2_PIX_FMT_RGB32;
    350     } else if (strcmp(pix_fmt, CameraParameters::PIXEL_FORMAT_YUV420SP) == 0) {
    351         org_fmt = V4L2_PIX_FMT_NV21;
    352     } else if (strcmp(pix_fmt, CameraParameters::PIXEL_FORMAT_JPEG) == 0) {
    353         /* We only have JPEG converted for NV21 format. */
    354         org_fmt = V4L2_PIX_FMT_NV21;
    355     } else {
    356         ALOGE("%s: Unsupported pixel format %s", __FUNCTION__, pix_fmt);
    357         return EINVAL;
    358     }
    359     /* Get JPEG quality. */
    360     int jpeg_quality = mParameters.getInt(CameraParameters::KEY_JPEG_QUALITY);
    361     if (jpeg_quality <= 0) {
    362         jpeg_quality = 90;  /* Fall back to default. */
    363     }
    364 
    365     /*
    366      * Make sure preview is not running, and device is stopped before taking
    367      * picture.
    368      */
    369 
    370     const bool preview_on = mPreviewWindow.isPreviewEnabled();
    371     if (preview_on) {
    372         doStopPreview();
    373     }
    374 
    375     /* Camera device should have been stopped when the shutter message has been
    376      * enabled. */
    377     EmulatedCameraDevice* const camera_dev = getCameraDevice();
    378     if (camera_dev->isStarted()) {
    379         ALOGW("%s: Camera device is started", __FUNCTION__);
    380         camera_dev->stopDeliveringFrames();
    381         camera_dev->stopDevice();
    382     }
    383 
    384     /*
    385      * Take the picture now.
    386      */
    387 
    388     /* Start camera device for the picture frame. */
    389     ALOGD("Starting camera for picture: %.4s(%s)[%dx%d]",
    390          reinterpret_cast<const char*>(&org_fmt), pix_fmt, width, height);
    391     res = camera_dev->startDevice(width, height, org_fmt);
    392     if (res != NO_ERROR) {
    393         if (preview_on) {
    394             doStartPreview();
    395         }
    396         return res;
    397     }
    398 
    399     /* Deliver one frame only. */
    400     mCallbackNotifier.setJpegQuality(jpeg_quality);
    401     mCallbackNotifier.setTakingPicture(true);
    402     res = camera_dev->startDeliveringFrames(true);
    403     if (res != NO_ERROR) {
    404         mCallbackNotifier.setTakingPicture(false);
    405         if (preview_on) {
    406             doStartPreview();
    407         }
    408     }
    409     return res;
    410 }
    411 
    412 status_t EmulatedCamera::cancelPicture()
    413 {
    414     ALOGV("%s", __FUNCTION__);
    415 
    416     return NO_ERROR;
    417 }
    418 
    419 status_t EmulatedCamera::setParameters(const char* parms)
    420 {
    421     ALOGV("%s", __FUNCTION__);
    422     PrintParamDiff(mParameters, parms);
    423 
    424     CameraParameters new_param;
    425     String8 str8_param(parms);
    426     new_param.unflatten(str8_param);
    427 
    428     /*
    429      * Check for new exposure compensation parameter.
    430      */
    431     int new_exposure_compensation = new_param.getInt(
    432             CameraParameters::KEY_EXPOSURE_COMPENSATION);
    433     const int min_exposure_compensation = new_param.getInt(
    434             CameraParameters::KEY_MIN_EXPOSURE_COMPENSATION);
    435     const int max_exposure_compensation = new_param.getInt(
    436             CameraParameters::KEY_MAX_EXPOSURE_COMPENSATION);
    437 
    438     // Checks if the exposure compensation change is supported.
    439     if ((min_exposure_compensation != 0) || (max_exposure_compensation != 0)) {
    440         if (new_exposure_compensation > max_exposure_compensation) {
    441             new_exposure_compensation = max_exposure_compensation;
    442         }
    443         if (new_exposure_compensation < min_exposure_compensation) {
    444             new_exposure_compensation = min_exposure_compensation;
    445         }
    446 
    447         const int current_exposure_compensation = mParameters.getInt(
    448                 CameraParameters::KEY_EXPOSURE_COMPENSATION);
    449         if (current_exposure_compensation != new_exposure_compensation) {
    450             const float exposure_value = new_exposure_compensation *
    451                     new_param.getFloat(
    452                             CameraParameters::KEY_EXPOSURE_COMPENSATION_STEP);
    453 
    454             getCameraDevice()->setExposureCompensation(
    455                     exposure_value);
    456         }
    457     }
    458 
    459     const char* new_white_balance = new_param.get(
    460             CameraParameters::KEY_WHITE_BALANCE);
    461     const char* supported_white_balance = new_param.get(
    462             CameraParameters::KEY_SUPPORTED_WHITE_BALANCE);
    463 
    464     if ((supported_white_balance != NULL) && (new_white_balance != NULL) &&
    465         (strstr(supported_white_balance, new_white_balance) != NULL)) {
    466 
    467         const char* current_white_balance = mParameters.get(
    468                 CameraParameters::KEY_WHITE_BALANCE);
    469         if ((current_white_balance == NULL) ||
    470             (strcmp(current_white_balance, new_white_balance) != 0)) {
    471             ALOGV("Setting white balance to %s", new_white_balance);
    472             getCameraDevice()->setWhiteBalanceMode(new_white_balance);
    473         }
    474     }
    475 
    476     mParameters = new_param;
    477 
    478     return NO_ERROR;
    479 }
    480 
    481 /* A dumb variable indicating "no params" / error on the exit from
    482  * EmulatedCamera::getParameters(). */
    483 static char lNoParam = '\0';
    484 char* EmulatedCamera::getParameters()
    485 {
    486     String8 params(mParameters.flatten());
    487     char* ret_str =
    488         reinterpret_cast<char*>(malloc(sizeof(char) * (params.length()+1)));
    489     memset(ret_str, 0, params.length()+1);
    490     if (ret_str != NULL) {
    491         strncpy(ret_str, params.string(), params.length()+1);
    492         return ret_str;
    493     } else {
    494         ALOGE("%s: Unable to allocate string for %s", __FUNCTION__, params.string());
    495         /* Apparently, we can't return NULL fron this routine. */
    496         return &lNoParam;
    497     }
    498 }
    499 
    500 void EmulatedCamera::putParameters(char* params)
    501 {
    502     /* This method simply frees parameters allocated in getParameters(). */
    503     if (params != NULL && params != &lNoParam) {
    504         free(params);
    505     }
    506 }
    507 
    508 status_t EmulatedCamera::sendCommand(int32_t cmd, int32_t arg1, int32_t arg2)
    509 {
    510     ALOGV("%s: cmd = %d, arg1 = %d, arg2 = %d", __FUNCTION__, cmd, arg1, arg2);
    511 
    512     /* TODO: Future enhancements. */
    513     return 0;
    514 }
    515 
    516 void EmulatedCamera::releaseCamera()
    517 {
    518     ALOGV("%s", __FUNCTION__);
    519 
    520     cleanupCamera();
    521 }
    522 
    523 status_t EmulatedCamera::dumpCamera(int fd)
    524 {
    525     ALOGV("%s", __FUNCTION__);
    526 
    527     /* TODO: Future enhancements. */
    528     return -EINVAL;
    529 }
    530 
    531 /****************************************************************************
    532  * Preview management.
    533  ***************************************************************************/
    534 
    535 status_t EmulatedCamera::doStartPreview()
    536 {
    537     ALOGV("%s", __FUNCTION__);
    538 
    539     EmulatedCameraDevice* camera_dev = getCameraDevice();
    540     if (camera_dev->isStarted()) {
    541         camera_dev->stopDeliveringFrames();
    542         camera_dev->stopDevice();
    543     }
    544 
    545     status_t res = mPreviewWindow.startPreview();
    546     if (res != NO_ERROR) {
    547         return res;
    548     }
    549 
    550     /* Make sure camera device is connected. */
    551     if (!camera_dev->isConnected()) {
    552         res = camera_dev->connectDevice();
    553         if (res != NO_ERROR) {
    554             mPreviewWindow.stopPreview();
    555             return res;
    556         }
    557     }
    558 
    559     int width, height;
    560     /* Lets see what should we use for frame width, and height. */
    561     if (mParameters.get(CameraParameters::KEY_VIDEO_SIZE) != NULL) {
    562         mParameters.getVideoSize(&width, &height);
    563     } else {
    564         mParameters.getPreviewSize(&width, &height);
    565     }
    566     /* Lets see what should we use for the frame pixel format. Note that there
    567      * are two parameters that define pixel formats for frames sent to the
    568      * application via notification callbacks:
    569      * - KEY_VIDEO_FRAME_FORMAT, that is used when recording video, and
    570      * - KEY_PREVIEW_FORMAT, that is used for preview frame notification.
    571      * We choose one or the other, depending on "recording-hint" property set by
    572      * the framework that indicating intention: video, or preview. */
    573     const char* pix_fmt = NULL;
    574     const char* is_video = mParameters.get(EmulatedCamera::RECORDING_HINT_KEY);
    575     if (is_video == NULL) {
    576         is_video = CameraParameters::FALSE;
    577     }
    578     if (strcmp(is_video, CameraParameters::TRUE) == 0) {
    579         /* Video recording is requested. Lets see if video frame format is set. */
    580         pix_fmt = mParameters.get(CameraParameters::KEY_VIDEO_FRAME_FORMAT);
    581     }
    582     /* If this was not video recording, or video frame format is not set, lets
    583      * use preview pixel format for the main framebuffer. */
    584     if (pix_fmt == NULL) {
    585         pix_fmt = mParameters.getPreviewFormat();
    586     }
    587     if (pix_fmt == NULL) {
    588         ALOGE("%s: Unable to obtain video format", __FUNCTION__);
    589         mPreviewWindow.stopPreview();
    590         return EINVAL;
    591     }
    592 
    593     /* Convert framework's pixel format to the FOURCC one. */
    594     uint32_t org_fmt;
    595     if (strcmp(pix_fmt, CameraParameters::PIXEL_FORMAT_YUV420P) == 0) {
    596         org_fmt = V4L2_PIX_FMT_YUV420;
    597     } else if (strcmp(pix_fmt, CameraParameters::PIXEL_FORMAT_RGBA8888) == 0) {
    598         org_fmt = V4L2_PIX_FMT_RGB32;
    599     } else if (strcmp(pix_fmt, CameraParameters::PIXEL_FORMAT_YUV420SP) == 0) {
    600         org_fmt = V4L2_PIX_FMT_NV21;
    601     } else {
    602         ALOGE("%s: Unsupported pixel format %s", __FUNCTION__, pix_fmt);
    603         mPreviewWindow.stopPreview();
    604         return EINVAL;
    605     }
    606     ALOGD("Starting camera: %dx%d -> %.4s(%s)",
    607          width, height, reinterpret_cast<const char*>(&org_fmt), pix_fmt);
    608     res = camera_dev->startDevice(width, height, org_fmt);
    609     if (res != NO_ERROR) {
    610         mPreviewWindow.stopPreview();
    611         return res;
    612     }
    613 
    614     res = camera_dev->startDeliveringFrames(false);
    615     if (res != NO_ERROR) {
    616         camera_dev->stopDevice();
    617         mPreviewWindow.stopPreview();
    618     }
    619 
    620     return res;
    621 }
    622 
    623 status_t EmulatedCamera::doStopPreview()
    624 {
    625     ALOGV("%s", __FUNCTION__);
    626 
    627     status_t res = NO_ERROR;
    628     if (mPreviewWindow.isPreviewEnabled()) {
    629         /* Stop the camera. */
    630         if (getCameraDevice()->isStarted()) {
    631             getCameraDevice()->stopDeliveringFrames();
    632             res = getCameraDevice()->stopDevice();
    633         }
    634 
    635         if (res == NO_ERROR) {
    636             /* Disable preview as well. */
    637             mPreviewWindow.stopPreview();
    638         }
    639     }
    640 
    641     return NO_ERROR;
    642 }
    643 
    644 /****************************************************************************
    645  * Private API.
    646  ***************************************************************************/
    647 
    648 status_t EmulatedCamera::cleanupCamera()
    649 {
    650     status_t res = NO_ERROR;
    651 
    652     /* If preview is running - stop it. */
    653     res = doStopPreview();
    654     if (res != NO_ERROR) {
    655         return -res;
    656     }
    657 
    658     /* Stop and disconnect the camera device. */
    659     EmulatedCameraDevice* const camera_dev = getCameraDevice();
    660     if (camera_dev != NULL) {
    661         if (camera_dev->isStarted()) {
    662             camera_dev->stopDeliveringFrames();
    663             res = camera_dev->stopDevice();
    664             if (res != NO_ERROR) {
    665                 return -res;
    666             }
    667         }
    668         if (camera_dev->isConnected()) {
    669             res = camera_dev->disconnectDevice();
    670             if (res != NO_ERROR) {
    671                 return -res;
    672             }
    673         }
    674     }
    675 
    676     mCallbackNotifier.cleanupCBNotifier();
    677 
    678     return NO_ERROR;
    679 }
    680 
    681 /****************************************************************************
    682  * Camera API callbacks as defined by camera_device_ops structure.
    683  *
    684  * Callbacks here simply dispatch the calls to an appropriate method inside
    685  * EmulatedCamera instance, defined by the 'dev' parameter.
    686  ***************************************************************************/
    687 
    688 int EmulatedCamera::set_preview_window(struct camera_device* dev,
    689                                        struct preview_stream_ops* window)
    690 {
    691     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    692     if (ec == NULL) {
    693         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    694         return -EINVAL;
    695     }
    696     return ec->setPreviewWindow(window);
    697 }
    698 
    699 void EmulatedCamera::set_callbacks(
    700         struct camera_device* dev,
    701         camera_notify_callback notify_cb,
    702         camera_data_callback data_cb,
    703         camera_data_timestamp_callback data_cb_timestamp,
    704         camera_request_memory get_memory,
    705         void* user)
    706 {
    707     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    708     if (ec == NULL) {
    709         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    710         return;
    711     }
    712     ec->setCallbacks(notify_cb, data_cb, data_cb_timestamp, get_memory, user);
    713 }
    714 
    715 void EmulatedCamera::enable_msg_type(struct camera_device* dev, int32_t msg_type)
    716 {
    717     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    718     if (ec == NULL) {
    719         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    720         return;
    721     }
    722     ec->enableMsgType(msg_type);
    723 }
    724 
    725 void EmulatedCamera::disable_msg_type(struct camera_device* dev, int32_t msg_type)
    726 {
    727     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    728     if (ec == NULL) {
    729         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    730         return;
    731     }
    732     ec->disableMsgType(msg_type);
    733 }
    734 
    735 int EmulatedCamera::msg_type_enabled(struct camera_device* dev, int32_t msg_type)
    736 {
    737     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    738     if (ec == NULL) {
    739         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    740         return -EINVAL;
    741     }
    742     return ec->isMsgTypeEnabled(msg_type);
    743 }
    744 
    745 int EmulatedCamera::start_preview(struct camera_device* dev)
    746 {
    747     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    748     if (ec == NULL) {
    749         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    750         return -EINVAL;
    751     }
    752     return ec->startPreview();
    753 }
    754 
    755 void EmulatedCamera::stop_preview(struct camera_device* dev)
    756 {
    757     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    758     if (ec == NULL) {
    759         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    760         return;
    761     }
    762     ec->stopPreview();
    763 }
    764 
    765 int EmulatedCamera::preview_enabled(struct camera_device* dev)
    766 {
    767     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    768     if (ec == NULL) {
    769         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    770         return -EINVAL;
    771     }
    772     return ec->isPreviewEnabled();
    773 }
    774 
    775 int EmulatedCamera::store_meta_data_in_buffers(struct camera_device* dev,
    776                                                int enable)
    777 {
    778     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    779     if (ec == NULL) {
    780         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    781         return -EINVAL;
    782     }
    783     return ec->storeMetaDataInBuffers(enable);
    784 }
    785 
    786 int EmulatedCamera::start_recording(struct camera_device* dev)
    787 {
    788     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    789     if (ec == NULL) {
    790         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    791         return -EINVAL;
    792     }
    793     return ec->startRecording();
    794 }
    795 
    796 void EmulatedCamera::stop_recording(struct camera_device* dev)
    797 {
    798     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    799     if (ec == NULL) {
    800         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    801         return;
    802     }
    803     ec->stopRecording();
    804 }
    805 
    806 int EmulatedCamera::recording_enabled(struct camera_device* dev)
    807 {
    808     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    809     if (ec == NULL) {
    810         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    811         return -EINVAL;
    812     }
    813     return ec->isRecordingEnabled();
    814 }
    815 
    816 void EmulatedCamera::release_recording_frame(struct camera_device* dev,
    817                                              const void* opaque)
    818 {
    819     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    820     if (ec == NULL) {
    821         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    822         return;
    823     }
    824     ec->releaseRecordingFrame(opaque);
    825 }
    826 
    827 int EmulatedCamera::auto_focus(struct camera_device* dev)
    828 {
    829     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    830     if (ec == NULL) {
    831         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    832         return -EINVAL;
    833     }
    834     return ec->setAutoFocus();
    835 }
    836 
    837 int EmulatedCamera::cancel_auto_focus(struct camera_device* dev)
    838 {
    839     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    840     if (ec == NULL) {
    841         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    842         return -EINVAL;
    843     }
    844     return ec->cancelAutoFocus();
    845 }
    846 
    847 int EmulatedCamera::take_picture(struct camera_device* dev)
    848 {
    849     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    850     if (ec == NULL) {
    851         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    852         return -EINVAL;
    853     }
    854     return ec->takePicture();
    855 }
    856 
    857 int EmulatedCamera::cancel_picture(struct camera_device* dev)
    858 {
    859     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    860     if (ec == NULL) {
    861         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    862         return -EINVAL;
    863     }
    864     return ec->cancelPicture();
    865 }
    866 
    867 int EmulatedCamera::set_parameters(struct camera_device* dev, const char* parms)
    868 {
    869     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    870     if (ec == NULL) {
    871         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    872         return -EINVAL;
    873     }
    874     return ec->setParameters(parms);
    875 }
    876 
    877 char* EmulatedCamera::get_parameters(struct camera_device* dev)
    878 {
    879     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    880     if (ec == NULL) {
    881         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    882         return NULL;
    883     }
    884     return ec->getParameters();
    885 }
    886 
    887 void EmulatedCamera::put_parameters(struct camera_device* dev, char* params)
    888 {
    889     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    890     if (ec == NULL) {
    891         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    892         return;
    893     }
    894     ec->putParameters(params);
    895 }
    896 
    897 int EmulatedCamera::send_command(struct camera_device* dev,
    898                                  int32_t cmd,
    899                                  int32_t arg1,
    900                                  int32_t arg2)
    901 {
    902     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    903     if (ec == NULL) {
    904         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    905         return -EINVAL;
    906     }
    907     return ec->sendCommand(cmd, arg1, arg2);
    908 }
    909 
    910 void EmulatedCamera::release(struct camera_device* dev)
    911 {
    912     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    913     if (ec == NULL) {
    914         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    915         return;
    916     }
    917     ec->releaseCamera();
    918 }
    919 
    920 int EmulatedCamera::dump(struct camera_device* dev, int fd)
    921 {
    922     EmulatedCamera* ec = reinterpret_cast<EmulatedCamera*>(dev->priv);
    923     if (ec == NULL) {
    924         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    925         return -EINVAL;
    926     }
    927     return ec->dumpCamera(fd);
    928 }
    929 
    930 int EmulatedCamera::close(struct hw_device_t* device)
    931 {
    932     EmulatedCamera* ec =
    933         reinterpret_cast<EmulatedCamera*>(reinterpret_cast<struct camera_device*>(device)->priv);
    934     if (ec == NULL) {
    935         ALOGE("%s: Unexpected NULL camera device", __FUNCTION__);
    936         return -EINVAL;
    937     }
    938     return ec->closeCamera();
    939 }
    940 
    941 /****************************************************************************
    942  * Static initializer for the camera callback API
    943  ****************************************************************************/
    944 
    945 camera_device_ops_t EmulatedCamera::mDeviceOps = {
    946     EmulatedCamera::set_preview_window,
    947     EmulatedCamera::set_callbacks,
    948     EmulatedCamera::enable_msg_type,
    949     EmulatedCamera::disable_msg_type,
    950     EmulatedCamera::msg_type_enabled,
    951     EmulatedCamera::start_preview,
    952     EmulatedCamera::stop_preview,
    953     EmulatedCamera::preview_enabled,
    954     EmulatedCamera::store_meta_data_in_buffers,
    955     EmulatedCamera::start_recording,
    956     EmulatedCamera::stop_recording,
    957     EmulatedCamera::recording_enabled,
    958     EmulatedCamera::release_recording_frame,
    959     EmulatedCamera::auto_focus,
    960     EmulatedCamera::cancel_auto_focus,
    961     EmulatedCamera::take_picture,
    962     EmulatedCamera::cancel_picture,
    963     EmulatedCamera::set_parameters,
    964     EmulatedCamera::get_parameters,
    965     EmulatedCamera::put_parameters,
    966     EmulatedCamera::send_command,
    967     EmulatedCamera::release,
    968     EmulatedCamera::dump
    969 };
    970 
    971 /****************************************************************************
    972  * Common keys
    973  ***************************************************************************/
    974 
    975 const char EmulatedCamera::FACING_KEY[]         = "prop-facing";
    976 const char EmulatedCamera::ORIENTATION_KEY[]    = "prop-orientation";
    977 const char EmulatedCamera::RECORDING_HINT_KEY[] = "recording-hint";
    978 
    979 /****************************************************************************
    980  * Common string values
    981  ***************************************************************************/
    982 
    983 const char EmulatedCamera::FACING_BACK[]      = "back";
    984 const char EmulatedCamera::FACING_FRONT[]     = "front";
    985 
    986 /****************************************************************************
    987  * Helper routines
    988  ***************************************************************************/
    989 
    990 static char* AddValue(const char* param, const char* val)
    991 {
    992     const size_t len1 = strlen(param);
    993     const size_t len2 = strlen(val);
    994     char* ret = reinterpret_cast<char*>(malloc(len1 + len2 + 2));
    995     ALOGE_IF(ret == NULL, "%s: Memory failure", __FUNCTION__);
    996     if (ret != NULL) {
    997         memcpy(ret, param, len1);
    998         ret[len1] = ',';
    999         memcpy(ret + len1 + 1, val, len2);
   1000         ret[len1 + len2 + 1] = '\0';
   1001     }
   1002     return ret;
   1003 }
   1004 
   1005 /****************************************************************************
   1006  * Parameter debugging helpers
   1007  ***************************************************************************/
   1008 
   1009 #if DEBUG_PARAM
   1010 static void PrintParamDiff(const CameraParameters& current,
   1011                             const char* new_par)
   1012 {
   1013     char tmp[2048];
   1014     const char* wrk = new_par;
   1015 
   1016     /* Divided with ';' */
   1017     const char* next = strchr(wrk, ';');
   1018     while (next != NULL) {
   1019         snprintf(tmp, sizeof(tmp), "%.*s", next-wrk, wrk);
   1020         /* in the form key=value */
   1021         char* val = strchr(tmp, '=');
   1022         if (val != NULL) {
   1023             *val = '\0'; val++;
   1024             const char* in_current = current.get(tmp);
   1025             if (in_current != NULL) {
   1026                 if (strcmp(in_current, val)) {
   1027                     ALOGD("=== Value changed: %s: %s -> %s", tmp, in_current, val);
   1028                 }
   1029             } else {
   1030                 ALOGD("+++ New parameter: %s=%s", tmp, val);
   1031             }
   1032         } else {
   1033             ALOGW("No value separator in %s", tmp);
   1034         }
   1035         wrk = next + 1;
   1036         next = strchr(wrk, ';');
   1037     }
   1038 }
   1039 #endif  /* DEBUG_PARAM */
   1040 
   1041 }; /* namespace android */
   1042