Simple Java Sound Question...

Can I draw waveforms while capturing data? If yes, how. If no, why.
Thanks. I need the answer ASAP, please help.

Hi nfactorial,
Can I draw waveforms while capturing data?If you would like to do that in Java you would need to know about how to use the Java language in general and especially about the Java Sound and Java2D APIs.
If yes, how.It would be too much to explain to answer such a general question. A general answer is, you need to use the Java Sound API to capture the data for which a waveform should be drawn. The Sound API delivers data as a stream of bytes typically encoded in pulse coded modulation (PCM) format. The data stream has digital samples each representing a level of sound pressure for a certain point in time. The stream of samples in the amplitude/time domain need to be transformed to a spectrum of samples in the amplitude/frequency domain, i.e. a number of PCM samples need to be mapped to the frequencies that should be displayed. This is done with the fast fourier transformation algorithm. Each set of amplitude/frequency values can then be displayed as a waveform by using some line drawing logic. The entire process would need to run constantly, i.e. as bytes are received from the sound data stream transformation and drawing is triggered.
Related readings:
Java Tutorial
http://java.sun.com/docs/books/tutorial/
Java Sound Documentation
http://java.sun.com/j2se/1.5.0/docs/guide/sound/index.html
Java Sound API Programmer's Guide
http://java.sun.com/j2se/1.5.0/docs/guide/sound/programmer_guide/contents.html
Java Sound Resources
http.//www.jsresources.org
Java 2D Graphics Tutorial
http://java.sun.com/docs/books/tutorial/2d/index.html
Wikipedia on fast fourier transformation
http://en.wikipedia.org/wiki/Fast_fourier_transform
HTH
Ulrich

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import java.io.File;
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          if(running)
               running = false;
               shutdown = true;
               if(playThread != null)
                    playThread.interrupt();
                    try{playThread.join();}
                    catch(Exception e){e.printStackTrace();}
          if (opened) close();
     private void close()
          System.out.println("close line");
          line.close();
          try{stream.close();}catch(Exception e){}
          line.removeLineListener(this);
          opened = false;
     // set the start and stop time
     public void setTimes(float t0, float tz)
          currentTime = t0;
          firstFrame = (long)(frameRate*t0);
          if(tz > 0)
               lastFrame = (long)(frameRate*tz);
          else lastFrame = frames;
          if(lastFrame > frames)lastFrame = frames;
          if(firstFrame > lastFrame)firstFrame = lastFrame;
     public void playAsync(float start, float end)
          setTimes(start,end);
          playAsync();
     // play the sound asynchronously */
     public void playAsync()
          System.out.println("Play async");
          if(!opened)openSound();
          if(opened && !running)
               playThread = new Thread(new Runnable(){public void run(){play();}});
               playThread.start();
     public void play(float start, float end)
          setTimes(start,end);
          play();
     // play the sound in the calling thread
     public void play()
          if(!opened)openSound();
          if(opened && !running)
               running = true;
               int writeSize = frameSize*bufFrames/2; // amount we write at a time
               byte buf[] = new byte[writeSize];     // our io buffer
               int len;
               long framesRemaining = lastFrame-firstFrame;
               int framesRead;
               currentFrame=firstFrame;
               System.out.println("playing file, firstFrame="+firstFrame+" lastFrame="+lastFrame);
               try
                    line.start();
                    if(firstFrame > 0)
                         long sa = firstFrame * frameSize;
                         System.out.println("Skipping "+firstFrame+" frames="+sa+" bytes");
                         while(sa > 0)sa -= stream.skip(sa);
                    while (running && framesRemaining > 0)
                         len = stream.read(buf,0,writeSize); // read our block
                         if(len > 0)
                              framesRead = len/frameSize;
                              framesRemaining -= framesRead;
                              currentTime = currentFrame/frameRate;
                              if(currentTime < 0)throw(new Exception("time too low"));
                              System.out.println("time="+currentTime+" writing "+len+" bytes");
                              line.write(buf,0,len);
                              currentFrame+=framesRead;
                         else framesRemaining = 0;
                    if(running)
                         line.drain();                     // let it play out
                         while(line.isActive() && running)
                              System.out.println("line active");
                              Thread.sleep(100);
                         shutdown = true;
                    running = false;
               catch(Exception e)
                    e.printStackTrace();
                    shutdown = true;
                    running = false;
               if(shutdown)
                    close();
     // return current time relative to start of sound
     public float getTime()
          return ((float)line.getMicrosecondPosition())/1000000;
     // return total time
     public float getLength()
          return (float)frames / frameRate;
     // stop the sound playback, return time in seconds
     public float pause()
          running = false;
          line.stop();
          return getTime();
     public void update(LineEvent le)
          System.out.println("Line event"+le.toString());
     // play a short simple PCM encoded clip
     public static void playShortClip(String fnm)
          java.applet.AudioClip clip=null;
          try
               java.io.File file = new java.io.File(fnm);     // get a file for the name provided
               if(file.exists())                    // only try to use a real file
                    clip = java.applet.Applet.newAudioClip(file.toURL()); // get the audio clip
               else
                    System.out.println("file="+fnm+" not found");
          catch(Exception e)
               System.out.println("Error building audio clip from file="+fnm);
               e.printStackTrace();
          if(clip != null)     // we may not actually have a clip
               final java.applet.AudioClip rclip = clip;
               new Thread
               (new Runnable()
                         public void run()
                              rclip.play();
               ).start();
     public boolean isOpened()
          return opened;
     public boolean isRunning()
          return running;
    public void showControls() {
        Control [] controls = line.getControls();
        for (Control c :controls) {
            System.out.println(c.toString());
    public void setGain(float gain) {
        FloatControl g = (FloatControl) line.getControl(FloatControl.Type.MASTER_GAIN);
        g.setValue(gain);
    public static void main(String [] args) {
        float gain = 0;
        String file = "c:\\javatest\\BallroomBlitz.wav";
          for(String arg : args) {
            for(int i = 0; i < arg.length(); i++) {
                char c = arg.charAt(i);
                if (c == '-') {
                    gain -= 1;
                } else if (c == '+') {
                    gain += 1;
                } else {
                         file = arg;
        SoundPlayer sp = new SoundPlayer(file);
        sp.showControls();
        System.out.println("setting gain to " + gain);
        sp.setGain(gain);
        sp.play();
}

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