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mp3播放器代码java的简单介绍( 三 )

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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;
/**
* The codePlayer/code class implements a simple player for playback of an
* MPEG audio stream.
*
* @author Mat McGowan
* @since 0.0.8
*/
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 codePlayer/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);
}
/**
* 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--0ret)
{
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;

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