java – 当我使用jmf流时,为什么它是UDP,而不是Wireshark中的RTP

这是我负责音频捕获和传输的功能.

public void captureAudio(){

    // Get the device list for ULAW
    Vector devices = captureDevices();

    CaptureDeviceInfo captureDeviceInfo = null;

    if (devices.size() > 0) {
         //get the first device from the list and cast it as CaptureDeviceInfo
         captureDeviceInfo = (CaptureDeviceInfo) devices.firstElement();
    }
    else {
        // exit if we could not find the relevant capturedevice.
        System.out.println("No such device found");
        System.exit(-1);
    }


    Processor processor = null;
    try {
        //Create a Processor for the specified media.
        processor = Manager.createProcessor(captureDeviceInfo.getLocator());
    } catch (IOException ex) {
        System.err.println(ex);
    } catch (NoProcessorException ex) {
        System.err.println(ex);
    }
    //Prepares the Processor to be programmed.
    //puts the Processor into the Configuring state.
    processor.configure();

    //Wait till the Processor configured.
    while (processor.getState() != Processor.Configured){
       try {
           Thread.sleep(100);
       } catch (InterruptedException e) {
           e.printStackTrace();
       }
   }


    //Sets the output content-type for this Processor
    processor.setContentDescriptor(CONTENT_DESCRIPTOR); 
    /** 
         ContentDescriptor CONTENT_DESCRIPTOR
                = new ContentDescriptor(ContentDescriptor.RAW_RTP); 
      */

    //Gets a TrackControl for each track in the media stream.
    TrackControl track[] = processor.getTrackControls();

    boolean encodingOk = false;

    //searching through tracks to get a supported audio format track.
    for (int i = 0; i < track.length; i++) {
        if (!encodingOk && track[i] instanceof FormatControl) {
            if (((FormatControl)
                    track[i]).setFormat( new AudioFormat(AudioFormat.ULAW_RTP,8000,8,1) ) == null)
            {
               track[i].setEnabled(false);
            }
            else {
                encodingOk = true;
                track[i].setEnabled(encodingOk);
                System.out.println("enc: " + i);
            }
        } else {
            // we could not set this track to ULAW,so disable it
            track[i].setEnabled(false);
        }
    }

    //If we could set this track to ULAW we proceed
    if (encodingOk){            
        processor.realize();
        while (processor.getState() != Processor.Realized){
           try {
               Thread.sleep(100);
           } catch (InterruptedException e) {
               e.printStackTrace();
           }
        }

        DataSource dataSource = null;
        try {
            dataSource = processor.getDataOutput();
        } catch (NotRealizedError e) {
            e.printStackTrace();
        }

        try {

            String url= "rtp://192.168.1.99:49150/audio/1";
            MediaLocator m = new MediaLocator(url);
            DataSink d = Manager.createDataSink(dataSource,m);
            d.open();
            d.start();
            System.out.println("transmitting...");
            processor.start();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

请问,如果您发现任何不正确或含糊的内容.
提前致谢.

（编辑：李大同）

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