I am trying to run an audio application on Fedora I, and my desktop is KDE. But I have the following error .
javax.sound.sampled.LineUnavailableException: Audio Device Unavailable
Ofcourse I stopped the process wich runs the sound device when the KDE runs automatically at start up.
********************** sbin> fuser /dev/dsp kill "process no" ******************* Then run my app again, but the same problem!.
Dou you have any suggessions ?!: Thanks !.
The source code is:
import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.io.*; import javax.sound.sampled.*;
public class AudioCapture01 extends JFrame {
boolean stopCapture = false;
ByteArrayOutputStream
byteArrayOutputStream;
AudioFormat audioFormat;
TargetDataLine targetDataLine;
AudioInputStream audioInputStream;
SourceDataLine sourceDataLine;
public static void main(
String args[]){
new AudioCapture01();
}//end main public AudioCapture01(){//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 everything set up for
// capture
audioFormat = getAudioFormat();
DataLine.Info dataLineInfo =
new DataLine.Info(
TargetDataLine.class,
audioFormat);
targetDataLine = (TargetDataLine)
AudioSystem.getLine(
dataLineInfo);
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 Thread(
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 Thread(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 declarations.
private AudioFormat getAudioFormat(){
float sampleRate = 8000.0F;
//8000,11025,16000,22050,44100
int sampleSizeInBits = 8;
//8,16
int channels = 2;
//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
// ===================================//
}