| /* |
| * 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 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 default camera. |
| * |
| * @param quality The target quality level |
| */ |
| public static int getJpegEncodingQualityParameter(int quality) { |
| return getJpegEncodingQualityParameter(0, quality); |
| } |
| |
| /** |
| * 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); |
| } |