content: /*
   * Copyright (C) 2010 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.media;
  
  import android.hardware.Camera;
  import android.hardware.Camera.CameraInfo;
  
  import java.util.Arrays;
  import java.util.HashMap;
  
  /**
   * The CameraProfile class is used to retrieve the pre-defined still image
   * capture (jpeg) quality levels (0-100) used for low, medium, and high
   * quality settings in the Camera application.
   *
   */
  public class CameraProfile
  {
      /**
       * Define three quality levels for JPEG image encoding.
       */
      /*
       * Don't change the values for these constants unless getImageEncodingQualityLevels()
       * method is also changed accordingly.
       */
      public static final int QUALITY_LOW    = 0;
      public static final int QUALITY_MEDIUM = 1;
      public static final int QUALITY_HIGH   = 2;
  
      /*
       * Cache the Jpeg encoding quality parameters
       */
      private static final HashMap<Integer, int[]> sCache = new HashMap<Integer, int[]>();
  
      /**
       * Returns a pre-defined still image capture (jpeg) quality level
       * used for the given quality level in the Camera application for
       * the first back-facing camera on the device. If the device has no
       * back-facing camera, this returns 0.
       *
       * @param quality The target quality level
       */
      public static int getJpegEncodingQualityParameter(int quality) {
          int numberOfCameras = Camera.getNumberOfCameras();
          CameraInfo cameraInfo = new CameraInfo();
          for (int i = 0; i < numberOfCameras; i++) {
              Camera.getCameraInfo(i, cameraInfo);
              if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
                  return getJpegEncodingQualityParameter(i, quality);
              }
          }
          return 0;
      }
  
      /**
       * Returns a pre-defined still image capture (jpeg) quality level
       * used for the given quality level in the Camera application for
       * the specified camera.
       *
       * @param cameraId The id of the camera
       * @param quality The target quality level
       */
      public static int getJpegEncodingQualityParameter(int cameraId, int quality) {
          if (quality < QUALITY_LOW || quality > QUALITY_HIGH) {
              throw new IllegalArgumentException("Unsupported quality level: " + quality);
          }
          synchronized (sCache) {
              int[] levels = sCache.get(cameraId);
              if (levels == null) {
                  levels = getImageEncodingQualityLevels(cameraId);
                  sCache.put(cameraId, levels);
              }
              return levels[quality];
          }
      }
  
      static {
          System.loadLibrary("media_jni");
          native_init();
      }
  
      private static int[] getImageEncodingQualityLevels(int cameraId) {
          int nLevels = native_get_num_image_encoding_quality_levels(cameraId);
          if (nLevels != QUALITY_HIGH + 1) {
              throw new RuntimeException("Unexpected Jpeg encoding quality levels " + nLevels);
          }
  
          int[] levels = new int[nLevels];
          for (int i = 0; i < nLevels; ++i) {
              levels[i] = native_get_image_encoding_quality_level(cameraId, i);
          }
          Arrays.sort(levels);  // Lower quality level ALWAYS comes before higher one
          return levels;
      }
  
      // Methods implemented by JNI
      private static native final void native_init();
      private static native final int native_get_num_image_encoding_quality_levels(int cameraId);
      private static native final int native_get_image_encoding_quality_level(int cameraId, int index);
  }
  