/*
* 11/19/04 1.0 moved to LGPL.
*-----------------------------------------------------------------------
* 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.advanced;
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;
import javazoom.jl.player.AudioDevice;
import javazoom.jl.player.FactoryRegistry;
import ch.ethz.dcg.miniplayer.IPositionListener;
/**
* a hybrid of javazoom.jl.player.Player tweeked to include
* <code>play(startFrame, endFrame)</code> hopefully this will be included in
* the api
*/
public class AdvancedPlayer {
/** The MPEG audio bitstream. */
private Bitstream bitstream;
/** The MPEG audio decoder. */
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;
/** Listener for the playback process */
private PlaybackListener listener;
private int currentPosition = 0;
private IPositionListener positionListener;
/**
* Creates a new <code>Player</code> instance.
*/
public AdvancedPlayer(InputStream stream) throws JavaLayerException {
this(stream, null);
}
public AdvancedPlayer(InputStream stream, AudioDevice device) throws JavaLayerException {
bitstream = new Bitstream(stream);
if (device != null)
audio = device;
else
audio = FactoryRegistry.systemRegistry().createAudioDevice();
audio.open(decoder = new Decoder());
}
public void play() throws JavaLayerException {
play(Integer.MAX_VALUE);
}
/**
* 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;
// report to listener
if (listener != null)
listener.playbackStarted(createEvent(PlaybackEvent.STARTED));
while (frames-- > 0 && ret) {
ret = decodeFrame();
currentPosition++;
if (positionListener != null) {
positionListener.onNewPosition(currentPosition);
}
}
// if (!ret)
{
// last frame, ensure all data flushed to the audio device.
AudioDevice out = audio;
if (out != null) {
// System.out.println(audio.getPosition());
out.flush();
// System.out.println(audio.getPosition());
synchronized (this) {
complete = (!closed);
close();
}
// report to listener
if (listener != null)
listener.playbackCompleted(createEvent(out, PlaybackEvent.STOPPED));
}
}
return ret;
}
/**
* Closes 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) {
}
}
}
/**
* 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);
}
return true;
}
/**
* skips over a single frame
*
* @return false if there are no more frames to decode, true otherwise.
*/
protected boolean skipFrame() throws JavaLayerException {
Header h = bitstream.readFrame();
if (h == null)
return false;
bitstream.closeFrame();
return true;
}
public void playFromPosition() throws JavaLayerException {
play(Integer.MAX_VALUE);
}
public boolean skipFrames(int num) throws JavaLayerException {
boolean ret = true;
int offset = num;
while (offset-- > 0 && ret)
ret = skipFrame();
return true;
}
/**
* Plays a range of MPEG audio frames
*
* @param start
* The first frame to play
* @param end
* The last frame to play
* @return true if the last frame was played, or false if there are more
* frames.
*/
public boolean play(final int start, final int end) throws JavaLayerException {
boolean ret = true;
int offset = start;
while (offset-- > 0 && ret)
ret = skipFrame();
this.currentPosition = start;
if (positionListener != null) {
positionListener.onNewPosition(currentPosition);
}
return play(end - start);
}
/**
* Constructs a <code>PlaybackEvent</code>
*/
private PlaybackEvent createEvent(int id) {
return createEvent(audio, id);
}
/**
* Constructs a <code>PlaybackEvent</code>
*/
private PlaybackEvent createEvent(AudioDevice dev, int id) {
return new PlaybackEvent(this, id, dev.getPosition());
}
/**
* sets the <code>PlaybackListener</code>
*/
public void setPlayBackListener(PlaybackListener listener) {
this.listener = listener;
}
/**
* sets the <code>PlaybackPositionListener</code>
*/
public void setPlayBackPositionListener(IPositionListener positionListener) {
this.positionListener = positionListener;
}
/**
* gets the <code>PlaybackListener</code>
*/
public PlaybackListener getPlayBackListener() {
return listener;
}
/**
* closes the player and notifies <code>PlaybackListener</code>
*/
public void stop() {
listener.playbackStopped(createEvent(PlaybackEvent.STOPPED));
close();
}
public int getPosition() {
return currentPosition;
}
public void playFrom(int position) throws JavaLayerException {
play(position, Integer.MAX_VALUE);
}
public boolean isComplete() {
return complete;
}
public int getLastPosition() {
return lastPosition;
}
}