/**
* The utillib library.
* More information is available at http://www.jinchess.com/.
* Copyright (C) 2004 Alexander Maryanovsky.
* All rights reserved.
*
* The utillib library 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 of the
* License, or (at your option) any later version.
*
* The utillib library 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 utillib library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package free.util.audio;
import java.io.IOException;
import java.io.OutputStream;
import java.io.InputStream;
import free.util.BlockingQueue;
import free.util.IOUtilities;
/**
* This is an AudioPlayer implementation which uses some external application
* to play audio. The player attempts to use a script named "play", which is
* run from the current directory without any arguments. The script is expected
* to read audio data from stdin, play it, and then terminate when its stdin is
* closed.
*/
public class ExternalAppAudioPlayer implements Runnable, AudioPlayer{
/**
* The current thread playing the sound.
*/
private Thread playerThread = null;
/**
* A BlockingQueue of queued AudioClips.
*/
private final BlockingQueue clipQueue = new BlockingQueue();
/**
* Returns <code>true</code>.
*/
public boolean isSupported(){
try{
Process testPlayer = createPlayer();
if (testPlayer != null){
testPlayer.destroy();
return true;
}
else
return false;
} catch (SecurityException e){
return false;
}
catch (IOException e){
return false;
}
}
/**
* Plays the given AudioClip.
*/
public synchronized void play(AudioClip clip) throws java.io.IOException{
// Lazily initialize player thread.
if (playerThread == null){
playerThread = new Thread(this, "ExternalAppAudioPlayer");
playerThread.setDaemon(true);
playerThread.start();
}
clipQueue.push(clip);
}
/**
* Creates the process that will play audio.
*/
private Process createPlayer() throws IOException{
return Runtime.getRuntime().exec("./play");
}
/**
* <code>Runnable</code> implementation. Plays the queued clips.
*/
public void run(){
while (true){
InputStream err = null;
try{
Process player = createPlayer();
err = player.getErrorStream();
OutputStream out = player.getOutputStream();
AudioClip clip;
try{
clip = (AudioClip)clipQueue.pop();
} catch (InterruptedException e){
e.printStackTrace();
return;
}
byte [] data = clip.getData();
out.write(data);
out.flush();
out.close();
} catch (IOException e){
try{
IOUtilities.pump(err, System.out);
} catch (IOException ex){}
e.printStackTrace();
synchronized(this){
playerThread = null;
return;
}
}
}
}
}
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