115 lines
4.0 KiB
Java
115 lines
4.0 KiB
Java
/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.media;
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import android.hardware.Camera;
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import android.hardware.Camera.CameraInfo;
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import java.util.Arrays;
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import java.util.HashMap;
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/**
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* The CameraProfile class is used to retrieve the pre-defined still image
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* capture (jpeg) quality levels (0-100) used for low, medium, and high
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* quality settings in the Camera application.
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*
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*/
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public class CameraProfile
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{
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/**
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* Define three quality levels for JPEG image encoding.
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*/
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/*
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* Don't change the values for these constants unless getImageEncodingQualityLevels()
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* method is also changed accordingly.
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*/
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public static final int QUALITY_LOW = 0;
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public static final int QUALITY_MEDIUM = 1;
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public static final int QUALITY_HIGH = 2;
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/*
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* Cache the Jpeg encoding quality parameters
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*/
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private static final HashMap<Integer, int[]> sCache = new HashMap<Integer, int[]>();
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/**
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* Returns a pre-defined still image capture (jpeg) quality level
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* used for the given quality level in the Camera application for
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* the first back-facing camera on the device. If the device has no
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* back-facing camera, this returns 0.
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*
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* @param quality The target quality level
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*/
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public static int getJpegEncodingQualityParameter(int quality) {
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int numberOfCameras = Camera.getNumberOfCameras();
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CameraInfo cameraInfo = new CameraInfo();
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for (int i = 0; i < numberOfCameras; i++) {
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Camera.getCameraInfo(i, cameraInfo);
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if (cameraInfo.facing == CameraInfo.CAMERA_FACING_BACK) {
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return getJpegEncodingQualityParameter(i, quality);
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}
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}
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return 0;
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}
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/**
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* Returns a pre-defined still image capture (jpeg) quality level
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* used for the given quality level in the Camera application for
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* the specified camera.
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*
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* @param cameraId The id of the camera
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* @param quality The target quality level
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*/
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public static int getJpegEncodingQualityParameter(int cameraId, int quality) {
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if (quality < QUALITY_LOW || quality > QUALITY_HIGH) {
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throw new IllegalArgumentException("Unsupported quality level: " + quality);
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}
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synchronized (sCache) {
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int[] levels = sCache.get(cameraId);
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if (levels == null) {
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levels = getImageEncodingQualityLevels(cameraId);
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sCache.put(cameraId, levels);
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}
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return levels[quality];
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}
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}
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static {
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System.loadLibrary("media_jni");
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native_init();
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}
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private static int[] getImageEncodingQualityLevels(int cameraId) {
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int nLevels = native_get_num_image_encoding_quality_levels(cameraId);
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if (nLevels != QUALITY_HIGH + 1) {
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throw new RuntimeException("Unexpected Jpeg encoding quality levels " + nLevels);
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}
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int[] levels = new int[nLevels];
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for (int i = 0; i < nLevels; ++i) {
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levels[i] = native_get_image_encoding_quality_level(cameraId, i);
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}
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Arrays.sort(levels); // Lower quality level ALWAYS comes before higher one
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return levels;
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}
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// Methods implemented by JNI
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private static native final void native_init();
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private static native final int native_get_num_image_encoding_quality_levels(int cameraId);
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private static native final int native_get_image_encoding_quality_level(int cameraId, int index);
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}
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