DataInputStream dis = new DataInputStream(ais)

 dis.readShort();

/*	Visualize.java
*	@author: Charles Bell
*	@version June 17, 2002
*/

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.sound.sampled.*;
import javax.swing.*;


public class Visualize extends JFrame implements ActionListener, Runnable{
	
	private Thread thread;
	private AudioInputStream ais;
	private float samplerate =  11025.0f;
	private float framerate = 11025.0f;
	private int buffersize = 16384;
	private JLabel imageLabel;	
	private boolean debug = false;	
	
	public Visualize(){
		super("Visualize");
		init();
	}
	
	public static void main(String[] args){
		new Visualize();
	}
	
	public void init(){
		
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		JButton startButton = new JButton("Start");
		JButton stopButton = new JButton("Stop");
		JButton exitButton = new JButton("Exit");
		startButton.addActionListener(this);
		stopButton.addActionListener(this);
		exitButton.addActionListener(this);
		JPanel controlPanel = new JPanel();
		controlPanel.add(startButton);
		controlPanel.add(stopButton);
		controlPanel.add(exitButton);
		getContentPane().add(controlPanel,BorderLayout.NORTH);
		JPanel imagePanel = new JPanel();
		imageLabel = new JLabel();
		imageLabel.setPreferredSize(new Dimension(344,344));

		imagePanel.add(imageLabel);
		getContentPane().add(imagePanel, BorderLayout.CENTER);
		pack();
		setLocationRelativeTo(null);
		show();
		
	}
	

	public void actionPerformed(ActionEvent actionevent){
		String command = actionevent.getActionCommand();
		if (command.compareTo("Start")==0){
			start();
		}else if (command.compareTo("Stop")==0){
			stop();
		}else if (command.compareTo("Exit")==0){
			if (thread != null) stop();
			System.exit(0);
		}
	}
	
	public void start() {
		thread = new Thread(this);
		thread.start();
	}

	public void stop() {
		thread = null;
	}        

	public void run(){
		record();
	}
	
	public void record() {
		TargetDataLine line = null;            
		// define the required attributes for our line, 
		// and make sure a compatible line is supported.
		AudioFormat audioformat = new AudioFormat(AudioFormat.Encoding.PCM_UNSIGNED, 
								samplerate, 8, 1, 1, framerate,false);
		DataLine.Info info = new DataLine.Info(TargetDataLine.class,audioformat);                        
		if (!AudioSystem.isLineSupported(info)) {
                	System.err.println("Line matching " + info + " not supported.");
                	System.exit(0);
		}
		// get and open the target data line for capture.		
		try{
                	line = (TargetDataLine) AudioSystem.getLine(info);
                	line.open(audioformat, line.getBufferSize());
		}catch (LineUnavailableException lune) { 
                	System.err.println("Unable to open the line: " + lune.getMessage());
                	System.exit(0);
		}catch (SecurityException se) { 
                	System.err.println("SecurityException: " + se.toString());
                	System.exit(0);
		}catch(Exception ex) { 
                	System.err.println("Exception: " + ex.getMessage());
			System.exit(0);
		}
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		int frameSizeInBytes = audioformat.getFrameSize();
		int bufferLengthInFrames = line.getBufferSize() / 8;
		int bufferLengthInBytes = bufferLengthInFrames * frameSizeInBytes;
			
		byte[] data = new byte[bufferLengthInBytes];
		int bytenumber = 0;            
		line.start();
		if (debug) System.out.println("Started Recording");
		int row = 0;
		int width = bufferLengthInBytes/2;
		imageLabel.setPreferredSize(new Dimension(width,width));
		pack();
		setLocationRelativeTo(null);

		int pix[] = new int[width * width];
		while (thread != null) {
			if ((bytenumber = line.read(data, 0, bufferLengthInBytes)) == -1) {
				break;
			}
			baos.write(data, 0, bytenumber);
			if (debug) System.out.println("Recorded " + data.length + " bytes."  + "  Row = " + row);

			for (int i = 0; i < data.length; i++) {
				int index = i + row*width;
				if (index >= pix.length) index = pix.length - 1;
				pix[index] = (int) data[i];
			}
			row++;
			if (row >= width) row = 0;
				
			Image img = createImage(new MemoryImageSource(width, width, pix, 0, width));
			imageLabel.setIcon(new ImageIcon(img));
		}
		if (debug) System.out.println("Stopped Recording");
		//stop and close the line
		line.stop();
		line.close();
		line = null;
		// stop and close the output stream
		try{
                	baos.flush();
                	baos.close();
		}catch (IOException ioe) {
                	System.err.println(ioe.getMessage());
		}
	}
}
[/pre}