/*
* 11/19/04 1.0 moved to LGPL.
* 29/01/00 Initial version. mdm@techie.com
*-----------------------------------------------------------------------
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as published
* by the Free Software Foundation; either version 2 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 Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*----------------------------------------------------------------------
*/
package javazoom.jl.player;
import java.io.InputStream;
import javazoom.jl.decoder.Bitstream;
import javazoom.jl.decoder.BitstreamException;
import javazoom.jl.decoder.Decoder;
import javazoom.jl.decoder.Header;
import javazoom.jl.decoder.JavaLayerException;
import javazoom.jl.decoder.SampleBuffer;
/**
* The <code>Player</code> class implements a simple player for playback
* of an MPEG audio stream.
*
* @author Mat McGowan
* @since 0.0.8
*/
// REVIEW: the audio device should not be opened until the
// first MPEG audio frame has been decoded.
public class Player
{
/**
* The current frame number.
*/
private int frame = 0;
/**
* The MPEG audio bitstream.
*/
// javac blank final bug.
/*final*/ private Bitstream bitstream;
/**
* The MPEG audio decoder.
*/
/*final*/ private Decoder decoder;
/**
* The AudioDevice the audio samples are written to.
*/
private AudioDevice audio;
/**
* Has the player been closed?
*/
private boolean closed = false;
/**
* Has the player played back all frames from the stream?
*/
private boolean complete = false;
private int lastPosition = 0;
/**
* Creates a new <code>Player</code> instance.
*/
public Player(InputStream stream) throws JavaLayerException
{
this(stream, null);
}
public Player(InputStream stream, AudioDevice device) throws JavaLayerException
{
bitstream = new Bitstream(stream);
decoder = new Decoder();
if (device!=null)
{
audio = device;
}
else
{
FactoryRegistry r = FactoryRegistry.systemRegistry();
audio = r.createAudioDevice();
}
audio.open(decoder);
}
public void play() throws JavaLayerException
{
play(Integer.MAX_VALUE);
}
public int getFrame() {
return frame;
}
/**
* Plays a number of MPEG audio frames.
*
* @param frames The number of frames to play.
* @return true if the last frame was played, or false if there are
* more frames.
*/
public boolean play(int frames) throws JavaLayerException
{
boolean ret = true;
while (frames-- > 0 && ret)
{
ret = decodeFrame();
}
if (!ret)
{
// last frame, ensure all data flushed to the audio device.
AudioDevice out = audio;
if (out!=null)
{
out.flush();
synchronized (this)
{
complete = (!closed);
close();
}
}
}
return ret;
}
/**
* Cloases this player. Any audio currently playing is stopped
* immediately.
*/
public synchronized void close()
{
AudioDevice out = audio;
if (out!=null)
{
closed = true;
audio = null;
// this may fail, so ensure object state is set up before
// calling this method.
out.close();
lastPosition = out.getPosition();
try
{
bitstream.close();
}
catch (BitstreamException ex)
{
}
}
}
/**
* Returns the completed status of this player.
*
* @return true if all available MPEG audio frames have been
* decoded, or false otherwise.
*/
public synchronized boolean isComplete()
{
return complete;
}
/**
* Retrieves the position in milliseconds of the current audio
* sample being played. This method delegates to the <code>
* AudioDevice</code> that is used by this player to sound
* the decoded audio samples.
*/
public int getPosition()
{
int position = lastPosition;
AudioDevice out = audio;
if (out!=null)
{
position = out.getPosition();
}
return position;
}
public void setPosition(int position) {
this.lastPosition = position;
}
/**
* Decodes a single frame.
*
* @return true if there are no more frames to decode, false otherwise.
*/
protected boolean decodeFrame() throws JavaLayerException
{
try
{
AudioDevice out = audio;
if (out==null)
return false;
Header h = bitstream.readFrame();
if (h==null)
return false;
// sample buffer set when decoder constructed
SampleBuffer output = (SampleBuffer)decoder.decodeFrame(h, bitstream);
synchronized (this)
{
out = audio;
if (out!=null)
{
out.write(output.getBuffer(), 0, output.getBufferLength());
}
}
bitstream.closeFrame();
}
catch (RuntimeException ex)
{
throw new JavaLayerException("Exception decoding audio frame", ex);
}
/*
catch (IOException ex)
{
System.out.println("exception decoding audio frame: "+ex);
return false;
}
catch (BitstreamException bitex)
{
System.out.println("exception decoding audio frame: "+bitex);
return false;
}
catch (DecoderException decex)
{
System.out.println("exception decoding audio frame: "+decex);
return false;
}
*/
return true;
}
}