AACAudioInputStream.java

/*
 *  Copyright (C) 2011 in-somnia
 * 
 *  This file is part of JAAD.
 * 
 *  JAAD 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 3 of the 
 *  License, or (at your option) any later version.
 *
 *  JAAD 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 library.
 *  If not, see <http://www.gnu.org/licenses/>.
 */
package net.sourceforge.jaad.spi.javasound;

import net.sourceforge.jaad.aac.AACException;
import net.sourceforge.jaad.aac.Decoder;
import net.sourceforge.jaad.aac.SampleBuffer;
import java.io.IOException;
import java.io.InputStream;
import javax.sound.sampled.AudioFormat;
import net.sourceforge.jaad.adts.ADTSDemultiplexer;

class AACAudioInputStream extends AsynchronousAudioInputStream {

	private final ADTSDemultiplexer adts;
	private final Decoder decoder;
	private final SampleBuffer sampleBuffer;
	private AudioFormat audioFormat = null;
	private byte[] saved;

	AACAudioInputStream(InputStream in, AudioFormat format, long length) throws IOException {
		super(in, format, length);
		adts = new ADTSDemultiplexer(in);
		decoder = new Decoder(adts.getDecoderSpecificInfo());
		sampleBuffer = new SampleBuffer();
	}

	@Override
	public AudioFormat getFormat() {
		if(audioFormat==null) {
			//read first frame
			try {
				decoder.decodeFrame(adts.readNextFrame(), sampleBuffer);
				audioFormat = new AudioFormat(sampleBuffer.getSampleRate(), sampleBuffer.getBitsPerSample(), sampleBuffer.getChannels(), true, true);
				saved = sampleBuffer.getData();
			}
			catch(IOException e) {
				return null;
			}
		}
		return audioFormat;
	}

	public void execute() {
		try {
			if(saved==null) {
				decoder.decodeFrame(adts.readNextFrame(), sampleBuffer);
				buffer.write(sampleBuffer.getData());
			}
			else {
				buffer.write(saved);
				saved = null;
			}
		}
		catch(IOException e) {
			buffer.close();
			return;
		}
	}
}