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POWhy it is UDP, not RTP in Wireshark when I stream using jmf?
 

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  1. POWhy it is UDP, not RTP in Wireshark when I stream using jmf?
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    <p>I want to capture and stream audio using JMF 2.1.1e in RTP format. I wrote a simple transmitter, I can transmit and receive the audio. But when I saw in Wireshark, I saw the packets as UDP. Can anyone point me out the problem, please.</p> <p>And here is my function responsible for audio capture and transmit. </p> <pre><code>public void captureAudio(){ // Get the device list for ULAW Vector devices = captureDevices(); CaptureDeviceInfo captureDeviceInfo = null; if (devices.size() &gt; 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 &lt; track.length; i++) { if (!encodingOk &amp;&amp; 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(); } } } </code></pre> <p>And please ask, if you find anything improper or vague. Thanks in advance. :)</p> <p><strong>Clarification</strong>: I have a peice of <strong>C#</strong> code for RTP streaming. And when I capture the data using <strong>wireshark</strong>, I can see them as <strong>RTP</strong>, but the problem is when I capture the data stream from <strong>JMF</strong> wireshark show them as <strong>UDP</strong>. And my question is, why?</p> <p>I know the difference between UDP and RTP.</p>
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    1. COI think the problem is on the CONTENT_DESCRIPTOR, it is raw-rtp.
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    2. COI understand that you code is running except for the problem you are facing right now. We need to see in JMF source code how JMF implements the Processor class when it uses the CONTENT_DESCRIPTOR like what Osbcure has said. Maybe this is the difference between the C# codes and the Java JMF codes. Care to tell what streaming library you are using for the C# version?
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    3. CO@eee : C# project is using pjsipDll,I just brought it from a friend to test the packets in wireshark, and I am not used to work with C#. So, couldn't give you any further detail on C#.
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