Sound capturing problem on Mac and Linux

Question

Hi,
I've an applet that enables users to record (through microphone), play and save audio as a Wav file. The Wav file is saved in the user's home directory. This applet works well on Windows, but not quite on Linux and Mac. When I click Record and say something to the microphone, click Stop and click Play to listen to the recorded audio, nothing is heard. I'm not sure where the bug is, whether it's in the recording or capturing function. I'm quite new to JAVA and the applet was written based on the sample Sound Recorder applet. Really appreciate it if someone could help me out since I need to deliver the final product as soon as possible. Here is the code. Thanks a lot.
/* Starts here */
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Line2D;
import java.awt.font.*;
import java.applet.*;
import java.applet.AudioClip;
import netscape.javascript.JSObject;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import javax.sound.sampled.*;
import java.io.*;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.*;
import java.util.*;
import java.util.Vector;
import java.util.Enumeration;
import java.net.*;
import java.lang.*;
public class sound extends Applet {
     public String Fspr = System.getProperty("file.separator");
     public String AllPath;
     public String myOS;
     public int tmp1 = 1;
     AudioClip sound;
boolean debug;
protected boolean running;
     protected int setIntNo;
ByteArrayOutputStream out;
AudioInputStream ais;
AudioFormat format;
String audioFmt;
boolean signed;
boolean bigEndian;
int sampleRate;
int sampleSizeInBits;
int channels;
String formatStr;
TargetDataLine line;
SourceDataLine sourceLine;
boolean playPressed;
boolean stopPressed;
boolean recordPressed;
DecimalFormat df;
DecimalFormat df2;
long msecCurrent;
long msecElapsed;
int minElapsed;
Date date;
long msecStart;
     public void init(){
          // Get path to the audio file
          AllPath = getHomeDir();
debug = false;
signed = true;
bigEndian = true;
          myOS = System.getProperty("os.name");
          if (myOS.equals("Mac OS X")){
               sampleRate = 44100;
          } else {
               sampleRate = 22050; // 8000-11025-12000-16000-22050-24000-32000-44100-48000
sampleSizeInBits = 16; // 8-16
channels = 1; // 1 - Mono 2 - Stereo
formatStr = "WAV";
playPressed = false;
stopPressed = false;
recordPressed = false;
df = new DecimalFormat("00");
df2 = new DecimalFormat("00,000,000");
date = new Date();
     public void callJS(String jsFunc) {
          URL url = null;
          try {
               url = new URL(jsFunc);
          }catch (MalformedURLException me) {
               String mydd = "Bad javascript url: " + jsFunc;
               JOptionPane.showMessageDialog(null, mydd, "Alert", javax.swing.JOptionPane.INFORMATION_MESSAGE);
          getAppletContext().showDocument(url);
     public void exitAudio(){
          System.exit(0);
     public void stopAudio(){
          running = false;
          stopPressed = true;
          playPressed = false;
          saveAudio();
     public void saveAudio(){
          try {
               byte abyte0[] = out.toByteArray();
               ByteArrayInputStream bytearrayinputstream = new ByteArrayInputStream(abyte0);
               AudioFormat audioformat = getFormat();
               try{
                    ais = new AudioInputStream(bytearrayinputstream, audioformat, abyte0.length / audioformat.getFrameSize());
               } catch(Exception exception) {
                    JOptionPane.showMessageDialog(null,"Unknown Format");
                    return;
               String s = "myfile." + formatStr;
               createAudioFile(ais, s);
          } catch(NullPointerException e) {
               JOptionPane.showMessageDialog(null,"Saving audio file unsuccessful!!!");
     public void captureAudio(){
try{
format = getFormat();
javax.sound.sampled.DataLine.Info info = new javax.sound.sampled.DataLine.Info(javax.sound.sampled.TargetDataLine.class, format);
if(line != null)
line.close();
try {
line = (TargetDataLine)AudioSystem.getLine(info);
line.open(format);
line.start();
} catch(IllegalArgumentException illegalargumentexception) {
                    JOptionPane.showMessageDialog(null, "Unknown Format.");
return;
date = new Date();
msecStart = date.getTime();
Runnable runnable = new Runnable() {
public void run(){
int i = 0;
out = new ByteArrayOutputStream();
running = true;
try{
while(running){
int j = line.read(buffer, 0, buffer.length);
if(j > 0){
out.write(buffer, 0, j);
msecCurrent = (new Date()).getTime();
msecElapsed = msecCurrent - msecStart;
out.close();
                              playAudio();
                              return;
} catch(IOException ioexception) {
                              JOptionPane.showMessageDialog(null, "I/O problems");
int bufferSize;
byte buffer[];
bufferSize = (int)format.getSampleRate() * format.getFrameSize();
buffer = new byte[bufferSize];
Thread thread = new Thread(runnable);
thread.start();
return;
}catch(LineUnavailableException lineunavailableexception){
JOptionPane.showMessageDialog(null, "Line unavailable");
return;
     public void playAudio(){
try{
if(playPressed)
return;
playPressed = true;
byte abyte0[] = out.toByteArray();
ByteArrayInputStream bytearrayinputstream = new ByteArrayInputStream(abyte0);
final AudioFormat final_audioformat = getFormat();
try{
ais = new AudioInputStream(bytearrayinputstream, final_audioformat, abyte0.length / final_audioformat.getFrameSize());
} catch(Exception exception) {
JOptionPane.showMessageDialog(null, "Unknown Format.");
return;
javax.sound.sampled.DataLine.Info info = new javax.sound.sampled.DataLine.Info(javax.sound.sampled.SourceDataLine.class, final_audioformat);
if(sourceLine != null)
sourceLine.close();
sourceLine = (SourceDataLine)AudioSystem.getLine(info);
sourceLine.open(final_audioformat);
sourceLine.start();
date = new Date();
msecStart = date.getTime();
Runnable runnable = new Runnable() {
public void run(){
int i = 0;
try{
int j;
while((j = ais.read(buffer, 0, buffer.length)) != -1) {
if(stopPressed){
stopPressed = false;
break;
if(j > 0){
sourceLine.write(buffer, 0, j);
msecCurrent = (new Date()).getTime();
msecElapsed = msecCurrent - msecStart;
sourceLine.drain();
sourceLine.close();
playPressed = false;
                              tmp1 = tmp1 + 1;
return;
} catch(IOException ioexception) {
JOptionPane.showMessageDialog(null, "I/O problems");
return;
int bufferSize;
byte buffer[];
bufferSize = (int)final_audioformat.getSampleRate() * final_audioformat.getFrameSize();
buffer = new byte[bufferSize];
Thread thread = new Thread(runnable);
thread.start();
return;
} catch(LineUnavailableException _ex) {
               JOptionPane.showMessageDialog(null, "Please close other audio device");
playPressed = false;
     private AudioFormat getFormat(){
return new AudioFormat(sampleRate, sampleSizeInBits, channels, signed, bigEndian);
     public String getHomeDir(){
String s = System.getProperty("user.home") + Fspr;
return s;
     public void createAudioFile(AudioInputStream audioinputstream, String s) {
StringTokenizer stringtokenizer = new StringTokenizer(s, ".");
stringtokenizer.nextToken();
String s1 = stringtokenizer.nextToken();
javax.sound.sampled.AudioFileFormat.Type type = null;
if(s1.equalsIgnoreCase("AU"))
type = javax.sound.sampled.AudioFileFormat.Type.AU;
else
if(s1.equalsIgnoreCase("WAV"))
type = javax.sound.sampled.AudioFileFormat.Type.WAVE;
else
if(s1.equalsIgnoreCase("AIFF"))
type = javax.sound.sampled.AudioFileFormat.Type.AIFF;
else
if(s1.equalsIgnoreCase("SND")){
type = javax.sound.sampled.AudioFileFormat.Type.SND;
} else {
return;
          try {
               String filename = AllPath+"UserAudio.wav";
               File file1 = new File(filename);
               if (file1.exists()) {  
                    System.gc();
                    boolean success = file1.delete();
                    if (!success){
                         JOptionPane.showMessageDialog(null,"Delete Failed");
               AudioSystem.write(audioinputstream, type, new File(AllPath+"UserAudio.wav"));
               recordPressed = false;
               return;
} catch(Exception exception) {
JOptionPane.showMessageDialog(null,"I/O Problems: " + exception);
/* Ends here */

Answer 1

Hi,
are you sure that the systems can handle the samplerate given? Is the mic input selected in the systems audio setup (on mac?)
Just put some singnal (sine or noise) in your buffer to check if the problem is on playback or on recording.
Tomy