device/1.0/types.hal

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.hardware.camera.device@1.0;

enum CameraFacing : uint32_t {
    /** The facing of the camera is opposite to that of the screen. */
    BACK = 0,
    /** The facing of the camera is the same as that of the screen. */
    FRONT = 1,
    /**
     * The facing of the camera is not fixed relative to the screen.
     * The cameras with this facing are external cameras, e.g. USB cameras.
     */
    EXTERNAL = 2
};

/**
 * Basic information about a camera device, always accessible via
 * ICameraDevice::getCameraInfo().
 */
struct CameraInfo {
    /**
     * The direction that this device faces.
     */
    CameraFacing facing;

    /**
     * The orientation of the camera image. The value is the angle that the
     * camera image needs to be rotated clockwise so it shows correctly on the
     * display in its natural orientation. It must be 0, 90, 180, or 270.
     *
     * For example, suppose a device has a naturally tall screen. The
     * back-facing camera sensor is mounted in landscape. You are looking at the
     * screen. If the top side of the camera sensor is aligned with the right
     * edge of the screen in natural orientation, the value must be 90. If the
     * top side of a front-facing camera sensor is aligned with the right of the
     * screen, the value must be 270.
     *
     * An external camera device must leave this set to 0.
     *
     */
    uint32_t orientation;

};

/**
 * Message types for ICameraDevice (at) 1.0::enableMsgType()/disableMsgType()
 *
 * A set of bit masks for specifying how the received preview frames are
 * handled before the previewCallback() call.
 *
 * The least significant 3 bits of an "int" value are used for this purpose:
 *
 * ..... 0 0 0
 *       ^ ^ ^
 *       | | |---------> determine whether the callback is enabled or not
 *       | |-----------> determine whether the callback is one-shot or not
 *       |-------------> determine whether the frame is copied out or not
 *
 * WARNING: When a frame is sent directly without copying, it is the frame
 * receiver's responsiblity to make sure that the frame data won't get
 * corrupted by subsequent preview frames filled by the camera. This flag is
 * recommended only when copying out data brings significant performance price
 * and the handling/processing of the received frame data is always faster than
 * the preview frame rate so that data corruption won't occur.
 *
 * For instance,
 * 1. 0x00 disables the callback. In this case, copy out and one shot bits
 *    are ignored.
 * 2. 0x01 enables a callback without copying out the received frames. A
 *    typical use case is the Camcorder application to avoid making costly
 *    frame copies.
 * 3. 0x05 is enabling a callback with frame copied out repeatedly. A typical
 *    use case is the Camera application.
 * 4. 0x07 is enabling a callback with frame copied out only once. A typical
 *    use case is the Barcode scanner application.
 */
enum FrameCallbackFlag : uint32_t {
    ENABLE_MASK = 0x01,
    ONE_SHOT_MASK = 0x02,
    COPY_OUT_MASK = 0x04,
    /** Typical use cases */
    NOOP = 0x00,
    CAMCORDER = 0x01,
    CAMERA = 0x05,
    BARCODE_SCANNER = 0x07
};

typedef bitfield<FrameCallbackFlag> FrameCallbackFlags;

/**
 * Subset of commands in /system/core/include/system/camera.h relevant for
 * ICameraDevice (at) 1.0::sendCommand()
 */
enum CommandType : uint32_t {
    START_SMOOTH_ZOOM = 1,
    STOP_SMOOTH_ZOOM = 2,

    /**
     * Start the face detection. This must be called only after preview is
     * started.  The camera must notify the listener of CAMERA_MSG_FACE and the
     * detected faces in the preview frame. The detected faces may be the same
     * as the previous ones. Apps must call CAMERA_CMD_STOP_FACE_DETECTION to
     * stop the face detection. This method is supported if CameraParameters
     * KEY_MAX_NUM_HW_DETECTED_FACES or KEY_MAX_NUM_SW_DETECTED_FACES is bigger
     * than 0. Hardware and software face detection must not be running at the
     * same time. If the face detection has started, apps must not send this
     * again.
     *
     * In hardware face detection mode, CameraParameters KEY_WHITE_BALANCE,
     * KEY_FOCUS_AREAS and KEY_METERING_AREAS have no effect.
     *
     * arg1 is the face detection type. It can be CAMERA_FACE_DETECTION_HW or
     * CAMERA_FACE_DETECTION_SW. If the type of face detection requested is not
     * supported, the HAL must return BAD_VALUE.
     */
    START_FACE_DETECTION = 6,

    /**
     * Stop the face detection.
     */
    STOP_FACE_DETECTION = 7,

    /**
     * Enable/disable focus move callback (CAMERA_MSG_FOCUS_MOVE). Passing
     * arg1 = 0 must disable, while passing arg1 = 1 must enable the callback.
     */
    ENABLE_FOCUS_MOVE_MSG = 8,

    /**
     * Configure an explicit format to use for video recording metadata mode.
     * This can be used to switch the format from the
     * default IMPLEMENTATION_DEFINED gralloc format to some other
     * device-supported format, and the default dataspace from the BT_709 color
     * space to some other device-supported dataspace. arg1 is the HAL pixel
     * format, and arg2 is the HAL dataSpace. This command returns
     * INVALID_OPERATION error if it is sent after video recording is started,
     * or the command is not supported at all.
     *
     * If the gralloc format is set to a format other than
     * IMPLEMENTATION_DEFINED, then HALv3 devices must use gralloc usage flags
     * of SW_READ_OFTEN.
     */
    SET_VIDEO_FORMAT = 11
};

/**
 * Message types for ICameraDevice1Callback::notifyCallback()
 */
enum NotifyCallbackMsg : uint32_t {
    ERROR = 0x0001,
    SHUTTER = 0x0002,
    FOCUS = 0x0004,
    ZOOM = 0x0008,
    // Notify on autofocus start and stop. This is useful in continuous
    // autofocus - FOCUS_MODE_CONTINUOUS_VIDEO and FOCUS_MODE_CONTINUOUS_PICTURE.
    FOCUS_MOVE = 0x0800
};

/**
 * Message types for ICameraDevice1Callback::dataCallback() and
 * ICameraDevice1Callback::dataCallbackTimestamp()
 */
enum DataCallbackMsg : uint32_t {
    PREVIEW_FRAME = 0x0010,
    VIDEO_FRAME = 0x0020,
    POSTVIEW_FRAME = 0x0040,
    RAW_IMAGE = 0x0080,
    COMPRESSED_IMAGE = 0x0100,
    RAW_IMAGE_NOTIFY = 0x0200,
    // Preview frame metadata. This can be combined with
    // CAMERA_MSG_PREVIEW_FRAME in dataCallback. For example, the apps can
    // request FRAME and METADATA. Or the apps can request only FRAME or only
    // METADATA.
    PREVIEW_METADATA = 0x0400
};

/**
 * Information for a single detected face.
 */
 struct CameraFace {
    /**
     * Bounds of the face [left, top, right, bottom]. (-1000, -1000) represents
     * the top-left of the camera field of view, and (1000, 1000) represents the
     * bottom-right of the field of view. The width and height cannot be 0 or
     * negative. This is supported by both hardware and software face detection.
     *
     * The direction is relative to the sensor orientation, that is, what the
     * sensor sees. The direction is not affected by the rotation or mirroring
     * of CAMERA_CMD_SET_DISPLAY_ORIENTATION.
     */
    int32_t[4] rect;

    /**
     * The confidence level of the face. The range is 1 to 100. 100 is the
     * highest confidence. This is supported by both hardware and software
     * face detection.
     */
    int32_t score;

    /**
     * An unique id per face while the face is visible to the tracker. If
     * the face leaves the field-of-view and comes back, it will get a new
     * id. If the value is 0, id is not supported.
     */
    int32_t id;

    /**
     * The coordinates of the center of the left eye. The range is -1000 to
     * 1000. -2000, -2000 if this is not supported.
     */
    int32_t[2] leftEye;

    /**
     * The coordinates of the center of the right eye. The range is -1000 to
     * 1000. -2000, -2000 if this is not supported.
     */
    int32_t[2] rightEye;

    /**
     * The coordinates of the center of the mouth. The range is -1000 to 1000.
     * -2000, -2000 if this is not supported.
     */
    int32_t[2] mouth;

};

/**
 * The metadata of the frame data, such as face detection result.
 */
struct CameraFrameMetadata {
    /**
     * A vector of the detected faces.
     */
    vec<CameraFace> faces;
};

/**
 * A simple integer handle to use to reference a particular memory buffer
 * between the HAL and the framework.
 */
typedef uint32_t MemoryId;

/*
 * Struct containing arguments of ICameraDeviceCallback::handleCallbackTimestamp.
 * Used to send a batch of messages in ICameraDeviceCallback::handleCallbackTimestampBatch.
 */
struct HandleTimestampMessage {
    // The handle of image buffer data.
    handle frameData;

    // A memory handle to the buffer containing the data
    MemoryId data;

    // The offset into the memory handle where the buffer starts.
    uint32_t bufferIndex;

    // The time this buffer was captured by the camera, in nanoseconds
    int64_t timestamp;
};

/*
 * Struct containing arguments of ICameraDevice::releaseRecordingFrameHandle.
 * Used by camera framework to send a batch of recording frames back to camera HAL.
 */
struct VideoFrameMessage {
    // The handle of image buffer data.
    handle frameData;

    // A memory handle to the buffer containing the data
    MemoryId data;

    // The offset into the memory handle where the buffer starts.
    uint32_t bufferIndex;
};