MP3 won't stream with JMF

Question

Basic idea is to access .mp3 file and send it through RTP stream to other client, who will want to play that song.

Here is RTPServer.java, which I found online and modif

Answer 1

There are a couple things to do to make the code in question works:

1. put mp3plugin.jar in the classpath. It is a mp3 plugin for JMF. You may find it online.

2. put the following code in the main method to register the newly added plugin.

   Format input1 = new AudioFormat(AudioFormat.MPEGLAYER3);
   Format input2 = new AudioFormat(AudioFormat.MPEG);
   Format output = new AudioFormat(AudioFormat.LINEAR);
   PlugInManager.addPlugIn(
           "com.sun.media.codec.audio.mp3.JavaDecoder",
           new Format[]{input1, input2},
           new Format[]{output},
           PlugInManager.CODEC);
   

3. set the track format to AduioFormat.DVI_RTP in the RTPServer.java to convert your mp3 music to a format that RTPClient can play.

Before

if (supported.length > 0) {
      chosen = supported[0]; // this is where I tried changing formats
      tracks[i].setFormat(chosen);
      System.err.println("Track " + i + " is set to transmit as: " +chosen);
      atLeastOneTrack = true;
  } else

After ( replace "chosen" with "new AudioFormat(AudioFormat.DVI_RTP)" )

if (supported.length > 0) {
      chosen = supported[0]; // this is where I tried changing formats
      tracks[i].setFormat(new AudioFormat(AudioFormat.DVI_RTP));
      atLeastOneTrack = true;
  } else

Then everything should work just fine.

Here is my RTPServer

import java.io.File;
import java.io.IOException;
import java.net.InetAddress;
import java.net.MalformedURLException;    
import javax.media.rtp.*;
import javax.media.rtp.rtcp.*;
import javax.media.*;
import javax.media.protocol.*;
import javax.media.control.*;
import javax.media.format.AudioFormat;

public class RTPServerMP3 implements ControllerListener {
    private String ipAddress;
    Processor p;
    public static void main(String[] args) throws NoProcessorException, IOException {
        Format input1 = new AudioFormat(AudioFormat.MPEGLAYER3);
        Format input2 = new AudioFormat(AudioFormat.MPEG);
        Format output = new AudioFormat(AudioFormat.LINEAR);
        PlugInManager.addPlugIn(
                "com.sun.media.codec.audio.mp3.JavaDecoder",
                new Format[]{input1, input2},
                new Format[]{output},
                PlugInManager.CODEC);
        RTPServerMP3 rtp = new RTPServerMP3("192.168.1.86");
        rtp.p = Manager.createProcessor(new MediaLocator((new File( "roar_of_future.mp3")).toURL()));
        rtp.p.addControllerListener(rtp);
        rtp.p.configure();
    }
    public RTPServerMP3(String ip) throws MalformedURLException {
        ipAddress = ip;
    }
    private void setTrackFormat(Processor p) {
        // Get the tracks from the processor
        TrackControl[] tracks = p.getTrackControls();
        // Do we have atleast one track?
        if (tracks == null || tracks.length < 1) {
            System.out.println("Couldn't find tracks in processor");
            System.exit(1);
        }
        // Set the output content descriptor to RAW_RTP
        // This will limit the supported formats reported from
        // Track.getSupportedFormats to only valid RTP formats.
        ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW_RTP);
        p.setContentDescriptor(cd);
        Format supported[];
        Format chosen;
        boolean atLeastOneTrack = false;
        // Program the tracks.
        for (int i = 0; i < tracks.length; i++) {
            Format format = tracks[i].getFormat();
            System.out.println("seeing format " + format.getEncoding() + " for track " + i);
            if (tracks[i].isEnabled()) {
                supported = tracks[i].getSupportedFormats();
                for (int n = 0; n < supported.length; n++)
                    System.out.println("Supported format: " + supported[n]);
                // We've set the output content to the RAW_RTP.
                // So all the supported formats should work with RTP.
                // We'll just pick the first one.
                if (supported.length > 0) {
                    chosen = supported[0]; // this is where I tried changing formats
                    tracks[i].setFormat(new AudioFormat(AudioFormat.DVI_RTP));
                    System.err.println("Track " + i + " is set to transmit as: " + chosen);
                    atLeastOneTrack = true;
                } else
                    tracks[i].setEnabled(false);
            } else
                tracks[i].setEnabled(false);
        }
    }

    private void transmit(Processor p) {
        try {
            DataSource output = p.getDataOutput();
            PushBufferDataSource pbds = (PushBufferDataSource) output;
            RTPManager rtpMgr = RTPManager.newInstance();
            SessionAddress localAddr, destAddr;
            SendStream sendStream;
            int port = 49150;
            SourceDescription srcDesList[];
            localAddr = new SessionAddress(InetAddress.getLocalHost(), port/2+10);
            InetAddress ipAddr = InetAddress.getByName(ipAddress);
            destAddr = new SessionAddress(ipAddr, port);
            rtpMgr.initialize(localAddr);
            rtpMgr.addTarget(destAddr);
            sendStream = rtpMgr.createSendStream(output, 0);
            sendStream.start();
            System.err.println("Created RTP session: " + ipAddress + " " + port);
            p.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public synchronized void controllerUpdate(ControllerEvent evt) {
        if (evt instanceof RealizeCompleteEvent) {
            transmit(p);
        } else if (evt instanceof ConfigureCompleteEvent) {
            setTrackFormat(p);
            p.setContentDescriptor(new ContentDescriptor(ContentDescriptor.RAW_RTP));
            p.realize();
        } else if (evt instanceof EndOfMediaEvent) {
            System.exit(0);
        } 
    }
}

Here is my RTPClient

import java.io.IOException;
import javax.media.*;

public class RTPClientMP3  {
    public static void main(String[] args) throws NoPlayerException, CannotRealizeException, IOException {
        String srcUrl = "rtp://192.168.1.86:49150/audio/1";
        MediaLocator src = new MediaLocator(srcUrl);
        Player player = Manager.createRealizedPlayer(src);
        player.start();

    }
}