AudioOutputStream.java

/*
 * Copyright (C) 2005 Luca Veltri - University of Parma - Italy
 * 
 * This source code is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This source code 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this source code; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * 
 * Author(s):
 * Luca Veltri (luca.veltri@unipr.it)
 */

package local.media;

import javax.sound.sampled.*;
import java.io.*;

/**
 * AudioOutputStream is equivalent to javax.sound.sampled.AudioInputStream for
 * audio playout. <p/> AudioOutputStream also provides audio codec conversion,
 * as javax.sound.sampled.AudioSystem does for the corresponding
 * javax.sound.sampled.AudioInputStream class.
 */
class AudioOutputStream extends OutputStream {
	static final int INTERNAL_BUFFER_SIZE = 40960;

	/** The SourceDataLine */
	protected SourceDataLine source_line;

	/** Converted InputStream. */
	protected InputStream input_stream;

	/** Piped OutputStream. */
	protected OutputStream output_stream;

	/** Internal buffer. */
	private byte[] buff = new byte[INTERNAL_BUFFER_SIZE];

	/** Creates a new AudioOutputStream from a SourceDataLine. */
	public AudioOutputStream(SourceDataLine source_line) {
		this.source_line = source_line;
		input_stream = null;
		output_stream = null;
	}

	/**
	 * Creates a new AudioOutputStream from a SourceDataLine converting the
	 * audio format.
	 */
	public AudioOutputStream(SourceDataLine source_line, AudioFormat format)
			throws IOException {
		this.source_line = source_line;

		PipedInputStream piped_input_stream = new PipedInputStream();
		output_stream = new PipedOutputStream(piped_input_stream);

		AudioInputStream audio_input_stream = new AudioInputStream(
				piped_input_stream, format, -1);
		if (audio_input_stream == null) {
			String err = "Failed while creating a new AudioInputStream.";
			throw new IOException(err);
		}

		input_stream = AudioSystem.getAudioInputStream(source_line.getFormat(),
				audio_input_stream);
		if (input_stream == null) {
			String err = "Failed while getting a transcoded AudioInputStream from AudioSystem.";
			err += "\n       input codec: " + format.toString();
			err += "\n       output codec:"
					+ source_line.getFormat().toString();
			throw new IOException(err);
		}
	}

	/**
	 * Closes this output stream and releases any system resources associated
	 * with this stream.
	 */
	public void close() { // source_line.close();
	}

	/**
	 * Flushes this output stream and forces any buffered output bytes to be
	 * written out.
	 */
	public void flush() {
		source_line.flush();
	}

	/**
	 * Writes b.length bytes from the specified byte array to this output
	 * stream.
	 */
	public void write(byte[] b) throws IOException {
		
		  if (!source_line.isRunning()) source_line.start();
			if (output_stream!=null) { output_stream.write(b); int
		  len=input_stream.read(buff,0,buff.length);
		  source_line.write(buff,0,len); } else {
		 
		source_line.write(b, 0, b.length);
		 } 
	}

	/**
	 * Writes len bytes from the specified byte array starting at offset off to
	 * this output stream.
	 */
	public void write(byte[] b, int off, int len) throws IOException {
		if (output_stream != null) {
			output_stream.write(b, off, len);
			len = input_stream.read(buff, 0, buff.length);
			source_line.write(buff, 0, len);
		} else { 
			source_line.write(b, off, len);
		} 
	}

	/** Writes the specified byte to this output stream. */
	public void write(int b) throws IOException {
		if (output_stream != null) {
			output_stream.write(b);
			int len = input_stream.read(buff, 0, buff.length);
			source_line.write(buff, 0, len);
		} else { 
			buff[0] = (byte) b;
			source_line.write(buff, 0, 1);
		} 
	}

}