TargetDataLine unsupported

Question

I downloaded the following example,
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.sound.sampled.*;
public class AudioCapture02 extends JFrame{
boolean stopCapture = false;
ByteArrayOutputStream byteArrayOutputStream;
AudioFormat audioFormat;
TargetDataLine targetDataLine;
AudioInputStream audioInputStream;
SourceDataLine sourceDataLine;
public static void main(String args[]){
new AudioCapture02();
}//end main
public AudioCapture02(){//constructor
final JButton captureBtn =
new JButton("Capture");
final JButton stopBtn = new JButton("Stop");
final JButton playBtn =
new JButton("Playback");
captureBtn.setEnabled(true);
stopBtn.setEnabled(false);
playBtn.setEnabled(false);
//Register anonymous listeners
captureBtn.addActionListener(
new ActionListener(){
public void actionPerformed(
     ActionEvent e){
captureBtn.setEnabled(false);
stopBtn.setEnabled(true);
playBtn.setEnabled(false);
//Capture input data from the
// microphone until the Stop button is
// clicked.
captureAudio();
}//end actionPerformed
}//end ActionListener
);//end addActionListener()
getContentPane().add(captureBtn);
stopBtn.addActionListener(
new ActionListener(){
public void actionPerformed(
     ActionEvent e){
captureBtn.setEnabled(true);
stopBtn.setEnabled(false);
playBtn.setEnabled(true);
//Terminate the capturing of input data
// from the microphone.
stopCapture = true;
}//end actionPerformed
}//end ActionListener
);//end addActionListener()
getContentPane().add(stopBtn);
playBtn.addActionListener(
new ActionListener(){
public void actionPerformed(
     ActionEvent e){
//Play back all of the data that was
// saved during capture.
playAudio();
}//end actionPerformed
}//end ActionListener
);//end addActionListener()
getContentPane().add(playBtn);
getContentPane().setLayout(new FlowLayout());
setTitle("Capture/Playback Demo");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setSize(250,70);
setVisible(true);
}//end constructor
//This method captures audio input from a
// microphone and saves it in a
// ByteArrayOutputStream object.
private void captureAudio(){
try{
//Get and display a list of
// available mixers.
Mixer.Info[] mixerInfo =
AudioSystem.getMixerInfo();
System.out.println("Available mixers:");
for(int cnt = 0; cnt < mixerInfo.length;
cnt++){
     System.out.println(mixerInfo[cnt].
     getName());
}//end for loop
//Get everything set up for capture
audioFormat = getAudioFormat();
DataLine.Info dataLineInfo =
new DataLine.Info(
TargetDataLine.class,
audioFormat);
System.out.println(dataLineInfo.getLineClass());
//Select one of the available
// mixers.
Mixer mixer = AudioSystem.
getMixer(mixerInfo[1]);
mixer.open();
if (mixer.isLineSupported(dataLineInfo))
     System.out.println("Supported");
else
     System.out.println("Not supported");
//Get a TargetDataLine on the selected
// mixer.
targetDataLine = (TargetDataLine)
mixer.getLine(dataLineInfo);
//Prepare the line for use.
targetDataLine.open(audioFormat);
targetDataLine.start();
//Create a thread to capture the microphone
// data and start it running. It will run
// until the Stop button is clicked.
Thread captureThread = new CaptureThread();
captureThread.start();
} catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end captureAudio method
//This method plays back the audio data that
// has been saved in the ByteArrayOutputStream
private void playAudio() {
try{
//Get everything set up for playback.
//Get the previously-saved data into a byte
// array object.
byte audioData[] = byteArrayOutputStream.
toByteArray();
//Get an input stream on the byte array
// containing the data
InputStream byteArrayInputStream =
new ByteArrayInputStream(audioData);
AudioFormat audioFormat = getAudioFormat();
audioInputStream = new AudioInputStream(
byteArrayInputStream,
audioFormat,
audioData.length/audioFormat.
getFrameSize());
DataLine.Info dataLineInfo =
new DataLine.Info(
SourceDataLine.class,
audioFormat);
sourceDataLine = (SourceDataLine)
AudioSystem.getLine(dataLineInfo);
sourceDataLine.open(audioFormat);
sourceDataLine.start();
//Create a thread to play back the data and
// start it running. It will run until
// all the data has been played back.
Thread playThread = new PlayThread();
playThread.start();
} catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end playAudio
//This method creates and returns an
// AudioFormat object for a given set of format
// parameters. If these parameters don't work
// well for you, try some of the other
// allowable parameter values, which are shown
// in comments following the declartions.
private AudioFormat getAudioFormat(){
float sampleRate = 8000.0F;
//8000,11025,16000,22050,44100
int sampleSizeInBits = 16;
//8,16
int channels = 1;
//1,2
boolean signed = true;
//true,false
boolean bigEndian = false;
//true,false
return new AudioFormat(
sampleRate,
sampleSizeInBits,
channels,
signed,
bigEndian);
}//end getAudioFormat
//=============================================//
//Inner class to capture data from microphone
class CaptureThread extends Thread{
//An arbitrary-size temporary holding buffer
byte tempBuffer[] = new byte[10000];
public void run(){
byteArrayOutputStream =
new ByteArrayOutputStream();
stopCapture = false;
try{//Loop until stopCapture is set by
// another thread that services the Stop
// button.
while(!stopCapture){
//Read data from the internal buffer of
// the data line.
int cnt = targetDataLine.read(tempBuffer,
0,
tempBuffer.length);
if(cnt > 0){
//Save data in output stream object.
byteArrayOutputStream.write(tempBuffer,
0,
cnt);
}//end if
}//end while
byteArrayOutputStream.close();
}catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end run
}//end inner class CaptureThread
//===================================//
//Inner class to play back the data
// that was saved.
class PlayThread extends Thread{
byte tempBuffer[] = new byte[10000];
public void run(){
try{
int cnt;
//Keep looping until the input read method
// returns -1 for empty stream.
while((cnt = audioInputStream.read(
     tempBuffer, 0,
tempBuffer.length)) != -1){
if(cnt > 0){
//Write data to the internal buffer of
// the data line where it will be
// delivered to the speaker.
sourceDataLine.write(tempBuffer,0,cnt);
}//end if
}//end while
//Block and wait for internal buffer of the
// data line to empty.
sourceDataLine.drain();
sourceDataLine.close();
}catch (Exception e) {
System.out.println(e);
System.exit(0);
}//end catch
}//end run
}//end inner class PlayThread
//=============================================//
But, it shows the following error. I tried with all of the available mixers. When I used DataLine.Info dataLineInfo =
new DataLine.Info(
SourceDataLine.class,
audioFormat);
it supports this format. I dont know, why its not supporting the class TargetDataLine.class
interface javax.sound.sampled.TargetDataLine
Not supported
java.lang.IllegalArgumentException: Line unsupported: interface TargetDataLine supporting format PCM_SIGNED 8000.0 Hz, 16 bit, mono, 2 bytes/frame, little-endian
All suggestions will be appreciated.

Answer 1

Sruthi_Gayathri, this forum is for special help with the Java Media Framework API and is not a catch-all for "I have media problems. There isn't a single line of code related to JMF in your posted code (although it does look like there's some JavaSound code, but even then, you'd need to be posting on the JavaSound forum, not the JMF one)
If you need help with your "rabbitmq server", then you need to find a forum that's setup for that. This forum is not.