Name: rmT116609 Date: 08/10/2004


FULL PRODUCT VERSION :
java version "1.4.2_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)
Java HotSpot(TM) Client VM (build 1.4.2_05-b04, mixed mode)

java version "1.5.0-beta2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta2-b51)
Java HotSpot(TM) Client VM (build 1.5.0-beta2-b51, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Windows 98 [Version 4.10.2222]


A DESCRIPTION OF THE PROBLEM :
Ordinary WAV files are played very infrequently by the PlayClip.java
program given below. Perhaps once out of 10 times, the sound
is played.

There's nothing wrong with the files, since I can play them with
sound applications, such as WavePad.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile the code given below, and then run with a WAV file.


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The WAV file supplied on the command line should play once.
e.g
> java PlayClip sample.wav
ACTUAL -
C>java PlayClip sample.wav
Playing...
Waiting
Exiting...

There is a delay which lasts for the duration of the audio file before
the "Exiting..." line appears, but no sound is played.

REPRODUCIBILITY :
This bug can be reproduced often.

---------- BEGIN SOURCE ----------

// PlayClip.java

import java.io.*;
import javax.sound.sampled.*;


public class PlayClip implements LineListener
{
  private Clip clip = null;


  public PlayClip(String fnm)
  {
    loadClip(fnm);
    
    if (clip != null) {
      System.out.println("Playing...");
      clip.start(); // start playing
    }

    // wait for the sound to finish playing; guess at 10 mins!
    System.out.println("Waiting");
    try {
      Thread.sleep(600000); // 10 mins in ms
    }
    catch(InterruptedException e)
    { System.out.println("Sleep Interrupted"); }
  } // end of PlayClip()


  private void loadClip(String fnm)
  {
    try {
      // link an audio stream to the sound clip's file
      AudioInputStream stream = AudioSystem.getAudioInputStream(
                          getClass().getResource(fnm) );

      AudioFormat format = stream.getFormat();
      DataLine.Info info = new DataLine.Info(Clip.class, format);

      // make sure sound system supports data line
      if (!AudioSystem.isLineSupported(info)) {
        System.out.println("Unsupported Clip File: " + fnm);
        System.exit(0);
      }

      // get clip line resource
      clip = (Clip) AudioSystem.getLine(info);

      // listen to clip for events
      clip.addLineListener(this);

      clip.open(stream); // open the sound file as a clip
      stream.close(); // we're done with the input stream
    } // end of try block

    catch (Exception e) {
      System.out.println(e);
      System.exit(0);
    }
  } // end of loadClip()


  public void update(LineEvent lineEvent)
  // called when the clip's line detects open, close, start, stop events
  {
    // has the clip has reached its end?
    if (lineEvent.getType() == LineEvent.Type.STOP) {
      System.out.println("Exiting...");
      clip.stop();
      System.exit(0);
    }
  } // end of update()

  // --------------------------------------------------

  public static void main(String[] args)
  {
    if (args.length != 1) {
      System.out.println("Usage: java PlayClip <clip file>");
      System.exit(0);
    }
    new PlayClip(args[0]);
  } // end of main()

} // end of PlayClip.java

---------- END SOURCE ----------

A Workaround
------------
The problem is to do with the _duration_ of the sound.
 
If the WAV file is less than a second long then no
sound is played.
 
My hacky solution is to obtain the duration of the
sound with:
   double duration = clip.getMicrosecondLength()/1000000.0;
 
Then calculate a count which is used to loop the
sound so it plays for a total of 1 second or more.
 
 loopCount = (int) (1.0 / duration);
 
 
 // clip.start(); // start playing
 clip.loop(loopCount);
(Incident Review ID: 296054)
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###@###.### 2004-08-12