| /* |
| * Copyright (C) 2012 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.media.AudioManager; |
| import android.media.SoundPool; |
| import android.util.Log; |
| |
| /** |
| * <p>A class for producing sounds that match those produced by various actions |
| * taken by the media and camera APIs. </p> |
| * |
| * <p>This class is recommended for use with the {@link android.hardware.camera2} API, since the |
| * camera2 API does not play any sounds on its own for any capture or video recording actions.</p> |
| * |
| * <p>With the older {@link android.hardware.Camera} API, use this class to play an appropriate |
| * camera operation sound when implementing a custom still or video recording mechanism (through the |
| * Camera preview callbacks with |
| * {@link android.hardware.Camera#setPreviewCallback Camera.setPreviewCallback}, or through GPU |
| * processing with {@link android.hardware.Camera#setPreviewTexture Camera.setPreviewTexture}, for |
| * example), or when implementing some other camera-like function in your application.</p> |
| * |
| * <p>There is no need to play sounds when using |
| * {@link android.hardware.Camera#takePicture Camera.takePicture} or |
| * {@link android.media.MediaRecorder} for still images or video, respectively, |
| * as the Android framework will play the appropriate sounds when needed for |
| * these calls.</p> |
| * |
| */ |
| public class MediaActionSound { |
| private static final int NUM_MEDIA_SOUND_STREAMS = 1; |
| |
| private SoundPool mSoundPool; |
| private int[] mSoundIds; |
| private int mSoundIdToPlay; |
| |
| private static final String[] SOUND_FILES = { |
| "/system/media/audio/ui/camera_click.ogg", |
| "/system/media/audio/ui/camera_focus.ogg", |
| "/system/media/audio/ui/VideoRecord.ogg", |
| "/system/media/audio/ui/VideoStop.ogg" |
| }; |
| |
| private static final String TAG = "MediaActionSound"; |
| /** |
| * The sound used by |
| * {@link android.hardware.Camera#takePicture Camera.takePicture} to |
| * indicate still image capture. |
| * @see #play |
| */ |
| public static final int SHUTTER_CLICK = 0; |
| |
| /** |
| * A sound to indicate that focusing has completed. Because deciding |
| * when this occurs is application-dependent, this sound is not used by |
| * any methods in the media or camera APIs. |
| * @see #play |
| */ |
| public static final int FOCUS_COMPLETE = 1; |
| |
| /** |
| * The sound used by |
| * {@link android.media.MediaRecorder#start MediaRecorder.start()} to |
| * indicate the start of video recording. |
| * @see #play |
| */ |
| public static final int START_VIDEO_RECORDING = 2; |
| |
| /** |
| * The sound used by |
| * {@link android.media.MediaRecorder#stop MediaRecorder.stop()} to |
| * indicate the end of video recording. |
| * @see #play |
| */ |
| public static final int STOP_VIDEO_RECORDING = 3; |
| |
| private static final int SOUND_NOT_LOADED = -1; |
| |
| /** |
| * Construct a new MediaActionSound instance. Only a single instance is |
| * needed for playing any platform media action sound; you do not need a |
| * separate instance for each sound type. |
| */ |
| public MediaActionSound() { |
| mSoundPool = new SoundPool(NUM_MEDIA_SOUND_STREAMS, |
| AudioManager.STREAM_SYSTEM_ENFORCED, 0); |
| mSoundPool.setOnLoadCompleteListener(mLoadCompleteListener); |
| mSoundIds = new int[SOUND_FILES.length]; |
| for (int i = 0; i < mSoundIds.length; i++) { |
| mSoundIds[i] = SOUND_NOT_LOADED; |
| } |
| mSoundIdToPlay = SOUND_NOT_LOADED; |
| } |
| |
| /** |
| * Preload a predefined platform sound to minimize latency when the sound is |
| * played later by {@link #play}. |
| * @param soundName The type of sound to preload, selected from |
| * SHUTTER_CLICK, FOCUS_COMPLETE, START_VIDEO_RECORDING, or |
| * STOP_VIDEO_RECORDING. |
| * @see #play |
| * @see #SHUTTER_CLICK |
| * @see #FOCUS_COMPLETE |
| * @see #START_VIDEO_RECORDING |
| * @see #STOP_VIDEO_RECORDING |
| */ |
| public synchronized void load(int soundName) { |
| if (soundName < 0 || soundName >= SOUND_FILES.length) { |
| throw new RuntimeException("Unknown sound requested: " + soundName); |
| } |
| if (mSoundIds[soundName] == SOUND_NOT_LOADED) { |
| mSoundIds[soundName] = |
| mSoundPool.load(SOUND_FILES[soundName], 1); |
| } |
| } |
| |
| /** |
| * <p>Play one of the predefined platform sounds for media actions.</p> |
| * |
| * <p>Use this method to play a platform-specific sound for various media |
| * actions. The sound playback is done asynchronously, with the same |
| * behavior and content as the sounds played by |
| * {@link android.hardware.Camera#takePicture Camera.takePicture}, |
| * {@link android.media.MediaRecorder#start MediaRecorder.start}, and |
| * {@link android.media.MediaRecorder#stop MediaRecorder.stop}.</p> |
| * |
| * <p>With the {@link android.hardware.camera2 camera2} API, this method can be used to play |
| * standard camera operation sounds with the appropriate system behavior for such sounds.</p> |
| |
| * <p>With the older {@link android.hardware.Camera} API, using this method makes it easy to |
| * match the default device sounds when recording or capturing data through the preview |
| * callbacks, or when implementing custom camera-like features in your application.</p> |
| * |
| * <p>If the sound has not been loaded by {@link #load} before calling play, |
| * play will load the sound at the cost of some additional latency before |
| * sound playback begins. </p> |
| * |
| * @param soundName The type of sound to play, selected from |
| * SHUTTER_CLICK, FOCUS_COMPLETE, START_VIDEO_RECORDING, or |
| * STOP_VIDEO_RECORDING. |
| * @see android.hardware.Camera#takePicture |
| * @see android.media.MediaRecorder |
| * @see #SHUTTER_CLICK |
| * @see #FOCUS_COMPLETE |
| * @see #START_VIDEO_RECORDING |
| * @see #STOP_VIDEO_RECORDING |
| */ |
| public synchronized void play(int soundName) { |
| if (soundName < 0 || soundName >= SOUND_FILES.length) { |
| throw new RuntimeException("Unknown sound requested: " + soundName); |
| } |
| if (mSoundIds[soundName] == SOUND_NOT_LOADED) { |
| mSoundIdToPlay = |
| mSoundPool.load(SOUND_FILES[soundName], 1); |
| mSoundIds[soundName] = mSoundIdToPlay; |
| } else { |
| mSoundPool.play(mSoundIds[soundName], 1.0f, 1.0f, 0, 0, 1.0f); |
| } |
| } |
| |
| private SoundPool.OnLoadCompleteListener mLoadCompleteListener = |
| new SoundPool.OnLoadCompleteListener() { |
| public void onLoadComplete(SoundPool soundPool, |
| int sampleId, int status) { |
| if (status == 0) { |
| if (mSoundIdToPlay == sampleId) { |
| soundPool.play(sampleId, 1.0f, 1.0f, 0, 0, 1.0f); |
| mSoundIdToPlay = SOUND_NOT_LOADED; |
| } |
| } else { |
| Log.e(TAG, "Unable to load sound for playback (status: " + |
| status + ")"); |
| } |
| } |
| }; |
| |
| /** |
| * Free up all audio resources used by this MediaActionSound instance. Do |
| * not call any other methods on a MediaActionSound instance after calling |
| * release(). |
| */ |
| public void release() { |
| if (mSoundPool != null) { |
| mSoundPool.release(); |
| mSoundPool = null; |
| } |
| } |
| } |
