Audio Level Meter

[xchris00]

Hello

I'm new to programming and I'm trying to make a java application that will "hear" (not record necessarily) the sound and display how loud is.I'm thinking of converting the sound recordings to numbers,so I can see the difference on the sound levels.I got this code and I added the "getLevel()" method,which returns the amplitude of the current recording,but it's returning -1 everytime.I guess I'm not using it properly. Any ideas how I must call this method?I have to deliver my project in a week,so any help will be much appreciated!

Code:

public class Capture extends JFrame {

      protected boolean running;
      ByteArrayOutputStream out;

      public Capture() {
        super("Capture Sound Demo");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        Container content = getContentPane();

        final JButton capture = new JButton("Capture");
        final JButton stop = new JButton("Stop");
        final JButton play = new JButton("Play");

        capture.setEnabled(true);
        stop.setEnabled(false);
        play.setEnabled(false);

        ActionListener captureListener =
            new ActionListener() {
          public void actionPerformed(ActionEvent e) {
            capture.setEnabled(false);
            stop.setEnabled(true);
            play.setEnabled(false);
            captureAudio();
          }
        };
        capture.addActionListener(captureListener);
        content.add(capture, BorderLayout.NORTH);

        ActionListener stopListener =
            new ActionListener() {
          public void actionPerformed(ActionEvent e) {
            capture.setEnabled(true);
            stop.setEnabled(false);
            play.setEnabled(true);
            running = false;
          }
        };
        stop.addActionListener(stopListener);
        content.add(stop, BorderLayout.CENTER);

        ActionListener playListener =
            new ActionListener() {
          public void actionPerformed(ActionEvent e) {
            playAudio();
          }
        };
        play.addActionListener(playListener);
        content.add(play, BorderLayout.SOUTH);
      }

      private void captureAudio() {
        try {
          final AudioFormat format = getFormat();
          DataLine.Info info = new DataLine.Info(
            TargetDataLine.class, format);
          final TargetDataLine line = (TargetDataLine)
            AudioSystem.getLine(info);
          line.open(format);
          line.start();
          
          Runnable runner = new Runnable() {
            int bufferSize = (int)format.getSampleRate()
              * format.getFrameSize();
            byte buffer[] = new byte[bufferSize];
    
            public void run() {
              out = new ByteArrayOutputStream();
              running = true;
              try {
                while (running) {
                  int count =
                    line.read(buffer, 0, buffer.length);
                  if (count > 0) {
                    out.write(buffer, 0, count);
                  
                    System.out.println(line.getLevel());  // |-this is what i added-|
                  }
                }
                out.close();
              } catch (IOException e) {
                System.err.println("I/O problems: " + e);
                System.exit(-1);
              }
            }
          };
          Thread captureThread = new Thread(runner);
          captureThread.start();
        } catch (LineUnavailableException e) {
          System.err.println("Line unavailable: " + e);
          System.exit(-2);
        }
      }

      private void playAudio() {
        try {
          byte audio[] = out.toByteArray();
          InputStream input =
            new ByteArrayInputStream(audio);
          final AudioFormat format = getFormat();
          final AudioInputStream ais =
            new AudioInputStream(input, format,
            audio.length / format.getFrameSize());
          DataLine.Info info = new DataLine.Info(
            SourceDataLine.class, format);
          final SourceDataLine line = (SourceDataLine)
            AudioSystem.getLine(info);
          line.open(format);
          line.start();
          
          Runnable runner = new Runnable() {
            int bufferSize = (int) format.getSampleRate()
              * format.getFrameSize();
            byte buffer[] = new byte[bufferSize];
    
            public void run() {
              try {
                int count;
                while ((count = ais.read(
                    buffer, 0, buffer.length)) != -1) {
                  if (count > 0) {
                    line.write(buffer, 0, count);
                  }
                }
                
                line.drain();
                line.close();
                
              } catch (IOException e) {
                System.err.println("I/O problems: " + e);
                System.exit(-3);
              }
            }
          };
          Thread playThread = new Thread(runner);
          playThread.start();
        } catch (LineUnavailableException e) {
          System.err.println("Line unavailable: " + e);
          System.exit(-4);
        }
      }

      private AudioFormat getFormat() {
        float sampleRate = 8000;
        int sampleSizeInBits = 8;
        int channels = 1;
        boolean signed = true;
        boolean bigEndian = true;
        return new AudioFormat(sampleRate,
          sampleSizeInBits, channels, signed, bigEndian);
      }
      
      @SuppressWarnings("deprecation")
    public static void main(String args[]) {
        JFrame frame = new Capture();
        frame.pack();
        frame.show();
      }      
}