/*****************************************************************************
* Aout.java
*****************************************************************************
* Copyright © 2011-2012 VLC authors and VideoLAN
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
package org.videolan.libvlc;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.util.Log;
public class AudioOutput {
/**
* Java side of the audio output module for Android.
* Uses an AudioTrack to play decoded audio buffers.
*
* TODO Use MODE_STATIC instead of MODE_STREAM with a MemoryFile (ashmem)
*/
public AudioOutput() {
}
private AudioTrack mAudioTrack;
private static final String TAG = "LibVLC/aout";
public void init(int sampleRateInHz, int channels, int samples) {
Log.d(TAG, sampleRateInHz + ", " + channels + ", " + samples + "=>" + channels * samples);
int minBufferSize = AudioTrack.getMinBufferSize(sampleRateInHz,
AudioFormat.CHANNEL_OUT_STEREO,
AudioFormat.ENCODING_PCM_16BIT);
mAudioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
sampleRateInHz,
AudioFormat.CHANNEL_OUT_STEREO,
AudioFormat.ENCODING_PCM_16BIT,
Math.max(minBufferSize, channels * samples * 2),
AudioTrack.MODE_STREAM);
}
public void release() {
if (mAudioTrack != null) {
mAudioTrack.release();
}
mAudioTrack = null;
}
public void playBuffer(byte[] audioData, int bufferSize) {
if (mAudioTrack.getState() == AudioTrack.STATE_UNINITIALIZED)
return;
if (mAudioTrack.write(audioData, 0, bufferSize) != bufferSize) {
Log.w(TAG, "Could not write all the samples to the audio device");
}
mAudioTrack.play();
}
public void pause() {
mAudioTrack.pause();
}
}