Name: fb126949			Date: 02/24/2004


Reported from a user on javasound-interest:

When I play sounds I often get a very short tick 
shortly after writing the sound data to the 
SourceDataLine.  I wrote this short program below for 
another purpose but it demonstrates it clearly.  I 
would be curious to know if others hear the tick as 
well or if it is just my computer/soundcard.  Higher 
sample rates make the tick less pronounced.  Larger 
buffers cause the tick to come later.


import javax.sound.sampled.*;

public class test {
 public static void main(String[] args) {
  int seconds = 2;
  int sampleRate = 8000;
  double frequency = 1000.0;
  double RAD = 2.0 * Math.PI;
  try {
   AudioFormat af = 
     new AudioFormat((float)sampleRate,8,1,true,true);
   DataLine.Info info = 
     new DataLine.Info(SourceDataLine.class,af);
   SourceDataLine source =
     (SourceDataLine)AudioSystem.getLine(info);
   source.open(af);
   source.start();
   byte[] buf = new byte[sampleRate * seconds];
   for (int i=0; i<buf.length; i++) {
    buf[i] =
     (byte)(Math.sin(RAD*frequency/sampleRate*i)*127.0);
//  System.out.println(buf[i]);
   }
   source.write(buf,0,buf.length);
   source.drain();
   source.stop();
   source.close();
  } catch (Exception e) {
   System.out.println(e);
  }
  System.exit(0);
 }
}


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More info from submitter:
The file I've been using is the 1-welcome.wav file that came with JavaSound 1.2 or 1.3.  It is attached.  The problem is related to the Clip.  If I try to play the same file by writing bytes to a SourceDataLine it works fine.