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package Game;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;
import micromod.Micromod;
/*
* Copyright 2009 Volker Oth
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* Class to play MOD music.
*
* @author Volker Oth
*/
public class ModMusic implements Runnable {
/** sample frequency */
private final static int SAMPLE_RATE = 44100;
/** object to play MODs */
private Micromod micromod;
/** flag: loop the song */
private boolean songloop;
/** flag: currently playing */
private boolean play;
/** thread for playing */
private Thread mmThread;
/** data line used to play samples */
private SourceDataLine line;
/**
* Load MOD file, initialize player.
* @param fn file name
* @throws ResourceException
*/
public void load(final String fn) throws ResourceException {
if (mmThread != null)
close();
String fName = Core.findResource(fn);
int datalen = (int)(new File(fName).length());
if( datalen < 0 ) throw new ResourceException(fName);
try {
FileInputStream f = new FileInputStream(fName);
byte[] songdata = new byte[ datalen ];
f.read( songdata );
f.close();
micromod = new Micromod( songdata, SAMPLE_RATE );
setloop( true );
} catch (FileNotFoundException ex) {
throw new ResourceException(fName);
} catch (IOException ex) {
throw new ResourceException(fName+" (IO exception)");
}
mmThread = new Thread( this );
mmThread.start();
}
/**
* Set whether the song is to loop continuously or not. The default is to loop.
* @param loop true: loop, false: playe only once
*/
public void setloop( final boolean loop ) {
songloop = loop;
}
/* (non-Javadoc)
* @see java.lang.Runnable#run()
*
* Begin playback.
* This method will return once the song has finished, or stop has been called.
*/
public void run() {
int buflen = 2048;
int[] lbuf = new int[ buflen ];
int[] rbuf = new int[ buflen ];
byte[] obuf = new byte[ buflen << 2 ];
try {
AudioFormat af = new AudioFormat( SAMPLE_RATE, 16, 2, true, false );
DataLine.Info lineInfo = new DataLine.Info( SourceDataLine.class, af );
//SourceDataLine line = (SourceDataLine)AudioSystem.getLine(lineInfo);
line = (SourceDataLine)GameController.sound.getLine(lineInfo);
line.open();
line.start();
setGain(Music.getGain());
int songlen = micromod.getlen();
int remain = songlen;
while( remain > 0 && Thread.currentThread() == mmThread) {
if (play) {
int count = buflen;
if ( count > remain ) count = remain;
micromod.mix( lbuf, rbuf, 0, count );
for( int ix = 0; ix < count; ix++ ) {
int ox = ix << 2;
obuf[ ox ] = ( byte ) ( lbuf[ ix ] & 0xFF );
obuf[ ox + 1 ] = ( byte ) ( lbuf[ ix ] >> 8 );
obuf[ ox + 2 ] = ( byte ) ( rbuf[ ix ] & 0xFF );
obuf[ ox + 3 ] = ( byte ) ( rbuf[ ix ] >> 8 );
lbuf[ ix ] = rbuf[ ix ] = 0;
}
line.write( obuf, 0, count << 2 );
remain -= count;
if( remain == 0 && songloop ) remain = songlen;
Thread.yield();
} else {
try {
line.flush();
Thread.sleep(40);
} catch (InterruptedException ex) {}
}
}
line.flush();
line.close();
} catch( LineUnavailableException e ) {
e.printStackTrace();
return;
}
}
/**
* Instruct the run() method to finish playing and return.
*/
public void stop() {
if (mmThread != null)
mmThread.interrupt();
play = false;
}
/**
* Instruct the run() method to resume playing.
*/
public void play() {
if (mmThread != null)
mmThread.interrupt();
play = true;
}
/**
* Kills the thread.
*/
public void close() {
Thread moribund = mmThread;
mmThread = null;
try {
moribund.interrupt();
moribund.join();
} catch (InterruptedException ex) {}
}
/**
* Set gain (volume) of MOD output
* @param gn gain factor: 0.0 (off) .. 1.0 (full volume)
*/
public void setGain(final double gn) {
double gain;
if (gn > 1.0)
gain = 1.0;
else if (gn < 0)
gain = 0;
else
gain = gn;
if (line != null)
GameController.sound.setLineGain(line, gain);
}
}
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