AudioTrackDecoder.java

import java.nio.ByteBuffer;

import android.content.Context;
import android.media.AudioFormat;
import android.media.AudioManager;
import android.media.AudioTrack;
import android.media.MediaFormat;
import android.net.Uri;

class AudioTrackDecoder extends AbstractTrackDecoder {
	private static final String TAG = AudioTrackDecoder.class.getSimpleName();
	private static final String AUDIO_PREFIX = "audio/";
	private static final int AUDIO_TRACK_BUFFER_SIZE = 2048;
	private AudioTrack audioTrack;

	public AudioTrackDecoder(String path) {
		super(path, AUDIO_PREFIX, null/* surface */);
		initilizeAudio();
	}

	private void initilizeAudio() {
		int sampleRate = format.getInteger(MediaFormat.KEY_SAMPLE_RATE);
		int chanelCfg = format.getInteger(MediaFormat.KEY_CHANNEL_COUNT);

		audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC, sampleRate,
		        chanelCfg /*AudioFormat.CHANNEL_CONFIGURATION_MONO*/, AudioFormat.ENCODING_PCM_16BIT,
		        AUDIO_TRACK_BUFFER_SIZE, AudioTrack.MODE_STREAM);
		audioTrack.play();
	}

	@Override
	protected void processDecodedData() {
		if (outputBufferIndex < 0) {
			return;
		}

		ByteBuffer buf = outputBuffers[outputBufferIndex];
		final byte[] chunk = new byte[bufferInfo.size];
		buf.get(chunk);
		buf.clear(); 
		if (chunk.length > 0) {
			audioTrack.write(chunk, 0, chunk.length);
		}
		codec.releaseOutputBuffer(outputBufferIndex, false /* render */);
	}

	@Override
	public void cleanup() {
		audioTrack.stop();
		audioTrack.release();
		audioTrack = null;
		super.cleanup();
	}

}