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  Capture streaming audio and perfom D.A.P  (Read 2402 times)
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Offline hawortte

Innocent Bystander




Java games rock!


« Posted 2004-07-06 16:33:05 »

I have created an mp3 player with flash that sits on the webpage client side. This plays sound through the clients soundcard. I want to create an applet with JMF that will capture this sound on the way to the sound card. I then want to perform digital audio prcessing: to create an equaliser using fast fourier transforms.

I have been looking at the JMF API and have found several open source code showing how to capture sound from a microphone and save it. Would I have to do something similar to enable me to capture streaming sound from the web? Would this sound then be in a suitable format for processing?

Any help on capturing streaming sound, or sound playing through the sound card would be very much appreciated.

Thank you

Tom
Huh
Offline erikd

JGO Ninja


Medals: 16
Projects: 4
Exp: 14 years


Maximumisness


« Reply #1 - Posted 2004-07-10 00:20:31 »

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import java.io.StreamCorruptedException;

import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.DataLine;
import javax.sound.sampled.LineUnavailableException;
import javax.sound.sampled.SourceDataLine;

import org.xiph.speex.SpeexDecoder;


/**
 * @author Erik Duijs
 */


public class AudioOutputListener implements AudioStreamListener {

     
      private SourceDataLine line;
      private boolean running;
      private RawSpeexStream stream;
      private AudioInputStream inputStream;
     
      private SpeexDecoder decoder;

     
      public AudioOutputListener() {
           
           
            AudioFormat format = new AudioFormat(AudioFormat.Encoding.PCM_SIGNED, 16000, 16, 1, 2, 16000, false);
            DataLine.Info info = new DataLine.Info(SourceDataLine.class, format, 8192);
           
            decoder = new SpeexDecoder();
            decoder.init(1, 16000, 1, false);
           
            //stream = new RawSpeexStream();
           //inputStream = new Speex2PcmAudioInputStream(stream, audioFormat, AudioSystem.NOT_SPECIFIED);

            try {
                 
                  line = (SourceDataLine) AudioSystem.getLine(info);
                  System.out.println("Sound initialized successfully.");
            } catch (LineUnavailableException lue) {
                 
                  System.err.println("Unavailable data line");
            }
           
            start();
      }
     
     
      public void start() {
           
            try {
                 
                  line.open();
            } catch (LineUnavailableException e) {

                  e.printStackTrace();
            }
           
            line.start();
      }
     
     
      /*
       * (non-Javadoc)
       *
       * @see com.qiui.sound.AudioStreamListener#write(byte[])
       */

      public void write(byte[] bytes) {
            if (line.isOpen()) {
                 
                  try {
                        decoder.processData(bytes, 0, bytes.length);
                  } catch (StreamCorruptedException e) {
                        // TODO Auto-generated catch block
                       e.printStackTrace();
                  }
                  byte[] decoded = new byte[decoder.getProcessedDataByteSize()];
                  decoder.getProcessedData(decoded, 0);

                  line.write(decoded, 0, decoded.length);
            }
      }
     
     
      public void stop() {
            line.close();
      }
}


It's a class from a voice over IP applet that I did with darcone. The write(byte[]) method is called by the networking code and writes a stream of compressed sound data. It's decoded using JSpeex and played back using javax.sound. You can do all DSP you like with the decoded sound data.

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