text: /*
   * Copyright (C) 2011 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.
   */
  
  #ifndef SYSTEM_CORE_INCLUDE_ANDROID_CAMERA_H
  #define SYSTEM_CORE_INCLUDE_ANDROID_CAMERA_H
  
  #include <stdint.h>
  #include <sys/cdefs.h>
  #include <sys/types.h>
  #include <cutils/native_handle.h>
  #include <hardware/hardware.h>
  #include <hardware/gralloc.h>
  
  __BEGIN_DECLS
  
  /**
   * 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 {
      CAMERA_FRAME_CALLBACK_FLAG_ENABLE_MASK = 0x01,
      CAMERA_FRAME_CALLBACK_FLAG_ONE_SHOT_MASK = 0x02,
      CAMERA_FRAME_CALLBACK_FLAG_COPY_OUT_MASK = 0x04,
      /** Typical use cases */
      CAMERA_FRAME_CALLBACK_FLAG_NOOP = 0x00,
      CAMERA_FRAME_CALLBACK_FLAG_CAMCORDER = 0x01,
      CAMERA_FRAME_CALLBACK_FLAG_CAMERA = 0x05,
      CAMERA_FRAME_CALLBACK_FLAG_BARCODE_SCANNER = 0x07
  };
  
  /** msgType in notifyCallback and dataCallback functions */
  enum {
      CAMERA_MSG_ERROR = 0x0001,            // notifyCallback
      CAMERA_MSG_SHUTTER = 0x0002,          // notifyCallback
      CAMERA_MSG_FOCUS = 0x0004,            // notifyCallback
      CAMERA_MSG_ZOOM = 0x0008,             // notifyCallback
      CAMERA_MSG_PREVIEW_FRAME = 0x0010,    // dataCallback
      CAMERA_MSG_VIDEO_FRAME = 0x0020,      // data_timestamp_callback
      CAMERA_MSG_POSTVIEW_FRAME = 0x0040,   // dataCallback
      CAMERA_MSG_RAW_IMAGE = 0x0080,        // dataCallback
      CAMERA_MSG_COMPRESSED_IMAGE = 0x0100, // dataCallback
      CAMERA_MSG_RAW_IMAGE_NOTIFY = 0x0200, // dataCallback
      // 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.
      CAMERA_MSG_PREVIEW_METADATA = 0x0400, // dataCallback
      CAMERA_MSG_ALL_MSGS = 0xFFFF
  };
  
  /** cmdType in sendCommand functions */
  enum {
      CAMERA_CMD_START_SMOOTH_ZOOM = 1,
      CAMERA_CMD_STOP_SMOOTH_ZOOM = 2,
  
      /**
       * Set the clockwise rotation of preview display (setPreviewDisplay) in
       * degrees. This affects the preview frames and the picture displayed after
       * snapshot. This method is useful for portrait mode applications. Note
       * that preview display of front-facing cameras is flipped horizontally
       * before the rotation, that is, the image is reflected along the central
       * vertical axis of the camera sensor. So the users can see themselves as
       * looking into a mirror.
       *
       * This does not affect the order of byte array of
       * CAMERA_MSG_PREVIEW_FRAME, CAMERA_MSG_VIDEO_FRAME,
       * CAMERA_MSG_POSTVIEW_FRAME, CAMERA_MSG_RAW_IMAGE, or
       * CAMERA_MSG_COMPRESSED_IMAGE. This is allowed to be set during preview
       * since API level 14.
       */
      CAMERA_CMD_SET_DISPLAY_ORIENTATION = 3,
  
      /**
       * cmdType to disable/enable shutter sound. In sendCommand passing arg1 =
       * 0 will disable, while passing arg1 = 1 will enable the shutter sound.
       */
      CAMERA_CMD_ENABLE_SHUTTER_SOUND = 4,
  
      /* cmdType to play recording sound */
      CAMERA_CMD_PLAY_RECORDING_SOUND = 5,
  
      /**
       * Start the face detection. This should be called after preview is started.
       * The camera will 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 should 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 should not be running
       * at the same time. If the face detection has started, apps should 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.
       */
      CAMERA_CMD_START_FACE_DETECTION = 6,
  
      /**
       * Stop the face detection.
       */
      CAMERA_CMD_STOP_FACE_DETECTION = 7,
  };
  
  /** camera fatal errors */
  enum {
      CAMERA_ERROR_UNKNOWN = 1,
      CAMERA_ERROR_SERVER_DIED = 100
  };
  
  enum {
      /** The facing of the camera is opposite to that of the screen. */
      CAMERA_FACING_BACK = 0,
      /** The facing of the camera is the same as that of the screen. */
      CAMERA_FACING_FRONT = 1
  };
  
  enum {
      /** Hardware face detection. It does not use much CPU. */
      CAMERA_FACE_DETECTION_HW = 0,
      /**
       * Software face detection. It uses some CPU. Applications must use
       * Camera.setPreviewTexture for preview in this mode.
       */
      CAMERA_FACE_DETECTION_SW = 1
  };
  
  /**
   * The information of a face from camera face detection.
   */
  typedef struct camera_face {
      /**
       * 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 rect[4];
  
      /**
       * 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 left_eye[2];
  
      /**
       * The coordinates of the center of the right eye. The range is -1000 to
       * 1000. -2000, -2000 if this is not supported.
       */
      int32_t right_eye[2];
  
      /**
       * The coordinates of the center of the mouth. The range is -1000 to 1000.
       * -2000, -2000 if this is not supported.
       */
      int32_t mouth[2];
  
  } camera_face_t;
  
  /**
   * The metadata of the frame data.
   */
  typedef struct camera_frame_metadata {
      /**
       * The number of detected faces in the frame.
       */
      int32_t number_of_faces;
  
      /**
       * An array of the detected faces. The length is number_of_faces.
       */
      camera_face_t *faces;
  } camera_frame_metadata_t;
  
  __END_DECLS
  
  #endif /* SYSTEM_CORE_INCLUDE_ANDROID_CAMERA_H */
  