Starting and stopping stream capture repeatedly

Question

Hi,
I am building a vmail server that captures an incoming, continuous RTP voice stream from a hardware phone and records portions of that stream to disk, based on control messages received (like record/stop buttons for a continuous RTP stream).
The first time I record, the sound file on the file system is well formatted. Subsequent recordings result in headerless audio files (although the audio data is correctly output to file otherwise).
The problem is that I need to get header information written to the audio files for subsequent recordings.
Here is a bit of source code to show how I am starting and stopping recording. At this point, the processor is already created and realized and the MediaLocator is previously initialized:
     MediaLocator recordedML ;
     public void startRecording() {
          try {
               processor.start();
               DataSource ds = null;
               ds = processor.getDataOutput();
               recordingDataSink = Manager.createDataSink(ds, recordedML);
               recordingDataSink.open();
               // starts sticking captured data into a file
               recordingDataSink.start();
          } catch (IOException e) {
               e.printStackTrace();
          } catch (NoDataSinkException e) {
               e.printStackTrace();
     public void stopRecording() {
          try {
               recordingDataSink.stop();
               recordingDataSink.close();
               recordingDataSink = null;
               processor.stop();
               processor.deallocate();
          } catch (IOException e) {
               e.printStackTrace();
Calling startRecording() and stopRecording() the first time results in a properly formatted sound file on the file system, captured from my incoming RTP stream.
Calling startRecording() and stopRecording() subsequent times results in headerless audio files.
So the problem seems to be that subsequent calls to processor.getDataOutput() result in a DataSource that doesn't print a file header.
What I have tried includes:
-recreating the processor, but this doesn't work because it seems you can only do this once for a single incoming stream - the processor never reaches the configured state a second time.
-reconfiguring the processor or re-realizing the processor, which doesn't do what I want either.
One way that I think this would work would be to write out the audio header manually after the capture is complete, but this seems like a gross hack and I would rather do it through JMF.
Is there a way to fix this via JMF? Is this a JMF bug or is it intended to work this way?
Cheers,
-Jeff

Answer 1

Hi, I am unfortunately unable to help you but perhaps you could help me. I have a Java GUI that I want to enable to record voice from a mic at the click of a button (stopping automatically if possible) and save to a defined file in the code. Would you be able to help me here? I have tried different source and rejigged things but I cannot seem to get anything working.
Any help gratefully apreciated.