Capture audio from soundcard - help!

Question

Hi everyone,
I'm tyring to write a little utility that captures everything coming out of my sound card and stores it as a .wav file on the system. (When I say everything, I mean wave output...for now).
The purpose of this little exercise is two fold, i) familiarise myself with JMF and ii) enable me to store music from online radio stations to burn and listen on CDs later.
I have thus far got to the point where I can successfully record a .wav file although when I play the file back it's completely silent. I have a sneaky suspicion that this is because I have not configured something to capture from an output port on the soundcard instead of the usual mic/line it etc...
Another problem I've just stumbled accross whilst testing the code before I post it is that if I run in debug mode and step through everything works fine. If I execute normally I get a "javax.media.NotConfiguredError: setContentDescriptor cannot be called before configured" exception. Why would this be happening when running normally, but not in debug?
Any hints/tips with this little lot would be great.
Thanks in advance,
Chris
PS My prototype is below;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Iterator;
import java.util.Vector;
import javax.media.CaptureDeviceInfo;
import javax.media.CaptureDeviceManager;
import javax.media.DataSink;
import javax.media.Manager;
import javax.media.MediaLocator;
import javax.media.Processor;
import javax.media.datasink.DataSinkEvent;
import javax.media.datasink.DataSinkListener;
import javax.media.datasink.EndOfStreamEvent;
import javax.media.protocol.DataSource;
import javax.media.protocol.FileTypeDescriptor;
public class JCapture
CaptureDeviceInfo captureDeviceInfo = null;
DataSink dataSink = null;
public static void main(String[] args)
JCapture jCapture = new JCapture();
jCapture.doIt();
System.exit(0);
private void doIt()
// retrieve list of available capture devices
Vector vector = CaptureDeviceManager.getDeviceList(null);
Iterator it = vector.iterator();
while(it.hasNext())
CaptureDeviceInfo deviceInfo = (CaptureDeviceInfo)it.next();
if("DirectSoundCapture".equals(deviceInfo.getName()))
captureDeviceInfo = deviceInfo;
break;
// exit if no capture devices found
if(captureDeviceInfo == null)
System.err.println("No capture devices found!");
System.exit(-1);
try
     // get media locator from capture device
     MediaLocator mediaLocator = captureDeviceInfo.getLocator();
     // create processor
     Processor p = Manager.createProcessor(mediaLocator);
     // configure the processor
     p.configure();
     // set the content type
     p.setContentDescriptor(new FileTypeDescriptor(FileTypeDescriptor.WAVE));
     // realise the processor
     p.realize();
     // get the output of processor
     DataSource dataSource = p.getDataOutput();
     // create medialocator with output file
     MediaLocator dest = new MediaLocator("file://c:\\myFile.wav");
     // create datasink passing in output source and medialocator specifying our output file
     dataSink = Manager.createDataSink(dataSource,dest);
     // create dataSink listener
               dataSink.addDataSinkListener
                    // anonymous inner class to handle DataSinkEvents
                    new DataSinkListener()
                         // if end of media, close data writer
                         public void dataSinkUpdate(DataSinkEvent dataEvent)
          // if capturing stopped, close DataSink
                              if(dataEvent instanceof EndOfStreamEvent)
                              dataSink.close();
     // open the datasink
     dataSink.open();
     // start the datasink
     dataSink.start();
     // start the processor
     p.start();
     getConsolePress();
     // stop the processor
     p.stop();
     // close the processor
     p.close();
catch(Exception e)
e.printStackTrace();
System.exit(-1);
System.out.println("Finished!!");
public void getConsolePress() throws Exception
InputStreamReader isr = new InputStreamReader(System.in);
BufferedReader input = new BufferedReader(isr);
String line;
System.out.println("Press x to stop capturing...");
while (!(line = input.readLine()).equals("x"))
System.out.println("Press x to stop capturing...");
return;

Answer 1

tyring to write a little utility that captures everything coming out of my sound card and stores it as >>a .wav file on the systemCapture (input) from an output???
You can capture from the mic/line in, so plug in a microphone and talk into it, to see if you are recording.
enable me to store music from online radio stations This has nothing to do with the sound card. The stream is from the internet, then capture that stream, pass it to jmf, and record to file.
You only need the sound card for listening(output) or record (live input from mic).