Issue playing sound

Hi,

I am trying to port an audio playing unit in, written in C, to Java. I
am having trouble getting any sound out and the write method keeps on
belong for several seconds. Can anyone look at the code and tell me
what is being done wrong?

Andre

Code follows:


import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;

/**
*
*/
public class Sound implements Runnable {
public static int AUDIO_BUFF_SIZE = 131072 * 3;

public static final int AUDIO_SAMPLE_FREQ = 22050;

public static final int AUDIO_SAMPLE_LOWFREQ = 8000;

public static final int AUDIO_SAMPLE_BITS = 8;

public static final int AUDIO_NUM_BUFS = 0;

public static final int AUDIO_BUFSIZE_BITS = 8;

public static final int AUDIO_MIX_BUFSIZE = 128;

public static final int AUDIO_NUM_VOICES = 8;

public static final int AUDIO_TIMER_FREQ = 56;

private int masterVolume = 100;

private SourceDataLine source;

private boolean playSound = true;

private int[] audioVol = new int[AUDIO_NUM_VOICES];
private boolean[] audioDVol = new boolean[AUDIO_NUM_VOICES];
private int[] audioFreq = new int[AUDIO_NUM_VOICES];
private boolean[] audioDFreq = new boolean[AUDIO_NUM_VOICES];
private int[] audioLen = new int[AUDIO_NUM_VOICES];
private char[][] audioData = new char[AUDIO_NUM_VOICES][];
private boolean[] audioOn = new boolean[AUDIO_NUM_VOICES];

private int audioSampleFreq = AUDIO_SAMPLE_FREQ;
private int audioTimeFreq = AUDIO_TIMER_FREQ;
private float sampleRate = AUDIO_SAMPLE_FREQ;

private Thread thread;

Sound() {

try {
AudioFormat af = new AudioFormat(this.sampleRate, 8, 1, true,
true);

DataLine.Info info = new DataLine.Info(SourceDataLine.class, af);
this.source = (SourceDataLine) AudioSystem.getLine(info);
this.source.open(af);
this.source.start();

this.thread = new Thread(this, "sound");
this.thread.start();

} catch (LineUnavailableException e) {
e.printStackTrace();
this.source = null;
}
}


/** */
public void playSample(int channel, char[] data, int offset, int len,
int freq, int volume, int loop) {
if (!playSound || (channel >= AUDIO_NUM_VOICES)) {
return;
}

this.audioOn[channel] = true;

char[] c = new char[len];
for ( int i=0; i<len; i++ )
{
c[i] = data[i+offset];
}
this.audioData[channel] = c;
this.audioLen[channel] = len;

this.audioFreq[channel] = freq;
this.audioVol[channel] = volume;

}

/** */
public void adjustSample(int channel, int freq, int volume) {
if (this.playSound && (channel >< AUDIO_NUM_VOICES)) {
this.audioDFreq[channel] = this.audioDFreq[channel]
| (freq != this.audioFreq[channel]);
this.audioDVol[channel] = this.audioDVol[channel]
| (volume != this.audioVol[channel]);
this.audioFreq[channel] = freq;
this.audioVol[channel] = volume;
}
}

/** */
public void stopSample(int channel) {

if (playSound && (channel < AUDIO_NUM_VOICES)) {
audioOn[channel] = false;
}
}

/** */
private void fillAudioBuffer(int[] in, byte[] out, int start,
int end) {
for (; start < Math.min(AUDIO_BUFF_SIZE, end); start++) {
out[start] = (byte) (in[start] >> 7) ;
}
}

/** */
public void run() {
System.out.println("run");
if (this.source == null) {
return;
}

int abuf_size = 0x00040008;
int abuf_inc = abuf_size / 4;
int abuf_ptr = 0;

int j = 0;

try {

while (this.playSound) {

try {
Thread.sleep( 1000 / audioTimeFreq );
} catch (InterruptedException e) {
}

byte[] buf = new byte[AUDIO_BUFF_SIZE];
int[] intbuf = new int[AUDIO_BUFF_SIZE];
int j1, j2;

j1 = abuf_ptr; /* calc pointers for chunk of buffer */
j2 = j1 + abuf_inc; /* to be filled this time around */

for (int i = 0; i < AUDIO_NUM_VOICES; i++) {

if ((this.audioOn[i]) && (this.audioLen[i] > 0)) {

for ( j = j1; j < j2; j++) {

if (i != 0) {
intbuf[j] += (this.audioVol[i] / 16)
* this.audioData[i][ ((j * this.audioFreq[i]) /
this.audioSampleFreq) % this.audioLen[i] ];
} else {
intbuf[j] = (int) (this.audioVol[0] / 16)
* this.audioData[0][((j * this.audioFreq[i]) /
this.audioSampleFreq) % this.audioLen[i] ];
}
}
this.audioDVol[i] = false;
this.audioDFreq[i] = false;

}
}

fillAudioBuffer(intbuf, buf, j1, j2);
if (j2 == abuf_size) {

System.out.println("PLAY");

this.source.write(buf, 0, intbuf.length);
this.source.drain();

System.out.println("done");

abuf_ptr = 0; /* and reset */

} else {
abuf_ptr = j2; /* not full - write more next time */

}

}
}
finally {
if (this.source != null) {
this.source.stop();
this.source.close();
this.source = null;
}
}
}
}

.

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