Capturing RTP sent by JMF with Wireshark

The post was originally at http://forums.sun.com/thread.jspa?threadID=5331241.
I am using http://java.sun.com/javase/technologies/desktop/media/jmf/2.1.1/solutions/RTPConnector.html as a template in my program. I see the packets sent back and forth using Wireshark but Wireshark doesnt recognize them as RTP packets but UDP. The original thread had an answer about the payload.
Where is the payload defined in the sample code I am using and how can I change the payload so that Wireshark captures them as RTP? Is it this line:
ContentDescriptor cd = new ContentDescriptor(ContentDescriptor.RAW_RTP); If yes, what should I change it to? Also, I took a look at Wireshark and you can force the UDP packets to decode as RTP but it is not very feasible.
Thanks.

If you need the custom RTPConnector to send out UDP packets that show up as RTP packets, I'd recommend reposting the question to the networking forum. That's more of a networking question than it is a JMF one.

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Wireshark capture rtp packets on Cisco CUBE.

Hello all,
We have this call flow and we are having intermittent DTMF issue
CUCM 10.5--->CUBE(10.1.1.10--->AVAYA(10.1.1.11)--->PSTN
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I followed below steps and I can see the traffic only from AVAYA to CUBE and that too only SIP and TCP not RTP.
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Router(config)# access-list 140 permit ip any host 32.55.55.32
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Now we need to name our particular packet capture. I have called mine "testcap"
Router# monitor capture point ip cef testcap all both
Router# monitor capture point associate testcap holdpackets
Now we can start our capture!
Router# monitor capture point start testcap
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Now you can export your data to your tftp server by typing in the following command. You can then open the .pcap file in Wireshark for viewing
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Any help is much appreciated
Thanks!

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Error in feeding JMF with inputstream, please help

Hi,
in order to feed JMF with inputstreams, audioinputstreams actually, you have to modify the DataSource.java and write a custom one so that it accepts inputstreams for the construction of the datasource, because with MediaLocator you can only specify existing files in the hard disk or somewhere in the network.
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Exception in thread "JMF thread: com.sun.media.ProcessEngine@d6a05e[ com.sun.media.ProcessEngine@d6a05e ] ( configureThread)" java.lang.NullPointerException
 at com.sun.media.ProcessEngine.isRTPFormat(ProcessEngine.java:99)
 at com.sun.media.ProcessEngine.reenableHintTracks(ProcessEngine.java:107)
 at com.sun.media.ProcessEngine.doConfigure(ProcessEngine.java:63)
 at com.sun.media.ConfigureWorkThread.process(BasicController.java:1370)
 at com.sun.media.StateTransitionWorkThread.run(BasicController.java:1339)
This error has appeared in some other post, but haven�t found the solution to it, I guess is something to do with the file format.
So please, I really need your help with this, as I�m getting stuck in a academical project because of this. I attach the bytebufferdatasource
Thank you for your time,
bye
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.PullDataSource;
import java.nio.ByteBuffer;
import java.io.IOException;
import javax.media.MediaLocator;
import javax.media.Duration;
import javax.media.Time;
* @author Chad McMillan
public class ByteBufferDataSource extends PullDataSource {
protected ContentDescriptor contentType;
protected SeekableStream[] sources;
protected boolean connected;
protected ByteBuffer anInput;
protected ByteBufferDataSource(){
* Construct a <CODE>ByteBufferDataSource</CODE> from a <CODE>ByteBuffer</CODE>.
* @param source The <CODE>ByteBuffer</CODE> that is used to create the
* the <CODE>DataSource</CODE>.
public ByteBufferDataSource(ByteBuffer input, String contentType) throws IOException {
anInput = input;
this.contentType = new ContentDescriptor(contentType);
connected = false;
* Open a connection to the source described by
* the <CODE>ByteBuffer/CODE>.
* 
* The <CODE>connect</CODE> method initiates communication with the source.
* @exception IOException Thrown if there are IO problems
* when <CODE>connect</CODE> is called.
public void connect() throws java.io.IOException {
connected = true;
sources = new SeekableStream [1];
sources[0] = new SeekableStream(anInput);
* Close the connection to the source described by the locator.
* 
* The <CODE>disconnect</CODE> method frees resources used to maintain a
* connection to the source.
* If no resources are in use, <CODE>disconnect</CODE> is ignored.
* If <CODE>stop</CODE> hasn't already been called,
* calling <CODE>disconnect</CODE> implies a stop.
public void disconnect() {
if(connected) {
sources[0].close();
connected = false;
* Get a string that describes the content-type of the media
* that the source is providing.
* 
* It is an error to call <CODE>getContentType</CODE> if the source is
* not connected.
* @return The name that describes the media content.
public String getContentType() {
if( !connected) {
throw new java.lang.Error("Source is unconnected.");
return contentType.getContentType();
public Object getControl(String str) {
return null;
public Object[] getControls() {
return new Object[0];
public javax.media.Time getDuration() {
return Duration.DURATION_UNKNOWN;
* Get the collection of streams that this source
* manages. The collection of streams is entirely
* content dependent. The MIME type of this
* <CODE>DataSource</CODE> provides the only indication of
* what streams can be available on this connection.
* @return The collection of streams for this source.
public javax.media.protocol.PullSourceStream[] getStreams() {
if( !connected) {
throw new java.lang.Error("Source is unconnected.");
return sources;
* Initiate data-transfer. The <CODE>start</CODE> method must be
* called before data is available.
*(You must call <CODE>connect</CODE> before calling <CODE>start</CODE>.)
* @exception IOException Thrown if there are IO problems with the source
* when <CODE>start</CODE> is called.
public void start() throws IOException {
* Stop the data-transfer.
* If the source has not been connected and started,
* <CODE>stop</CODE> does nothing.
public void stop() throws IOException {
}

Sorry for the formatting, I attach it again here with well format:
the error was:
Exception in thread "JMF thread: com.sun.media.ProcessEngine@d6a05e[ com.sun.media.ProcessEngine@d6a05e ] ( configureThread)" java.lang.NullPointerException
 at com.sun.media.ProcessEngine.isRTPFormat(ProcessEngine.java:99)
 at com.sun.media.ProcessEngine.reenableHintTracks(ProcessEngine.java:107)
 at com.sun.media.ProcessEngine.doConfigure(ProcessEngine.java:63)
 at com.sun.media.ConfigureWorkThread.process(BasicController.java:1370)
 at com.sun.media.StateTransitionWorkThread.run(BasicController.java:1339)
and the java file for generating the datasource from the bytebuffer was:
import javax.media.protocol.ContentDescriptor;
import javax.media.protocol.PullDataSource;
import java.nio.ByteBuffer;
import java.io.IOException;
import javax.media.MediaLocator;
import javax.media.Duration;
import javax.media.Time;
* @author Chad McMillan
public class ByteBufferDataSource extends PullDataSource {
 protected ContentDescriptor contentType;
 protected SeekableStream[] sources;
 protected boolean connected;
 protected ByteBuffer anInput;
 protected ByteBufferDataSource(){
 * Construct a <CODE>ByteBufferDataSource</CODE> from a <CODE>ByteBuffer</CODE>.
 * @param source The <CODE>ByteBuffer</CODE> that is used to create the
 * the <CODE>DataSource</CODE>.
 public ByteBufferDataSource(ByteBuffer input, String contentType) throws IOException {
 anInput = input;
 this.contentType = new ContentDescriptor(contentType);
 connected = false;
 * Open a connection to the source described by
 * the <CODE>ByteBuffer/CODE>.
 * 
 * The <CODE>connect</CODE> method initiates communication with the source.
 * @exception IOException Thrown if there are IO problems
 * when <CODE>connect</CODE> is called.
 public void connect() throws java.io.IOException {
 connected = true;
 sources = new SeekableStream [1];
 sources[0] = new SeekableStream(anInput);
 * Close the connection to the source described by the locator.
 * 
 * The <CODE>disconnect</CODE> method frees resources used to maintain a
 * connection to the source.
 * If no resources are in use, <CODE>disconnect</CODE> is ignored.
 * If <CODE>stop</CODE> hasn't already been called,
 * calling <CODE>disconnect</CODE> implies a stop.
 public void disconnect() {
 if(connected) {
 sources[0].close();
 connected = false;
 * Get a string that describes the content-type of the media
 * that the source is providing.
 * 
 * It is an error to call <CODE>getContentType</CODE> if the source is
 * not connected.
 * @return The name that describes the media content.
 public String getContentType() {
 if( !connected) {
 throw new java.lang.Error("Source is unconnected.");
 return contentType.getContentType();
 public Object getControl(String str) {
 return null;
 public Object[] getControls() {
 return new Object[0];
 public javax.media.Time getDuration() {
 return Duration.DURATION_UNKNOWN;
 * Get the collection of streams that this source
 * manages. The collection of streams is entirely
 * content dependent. The MIME type of this
 * <CODE>DataSource</CODE> provides the only indication of
 * what streams can be available on this connection.
 * @return The collection of streams for this source.
 public javax.media.protocol.PullSourceStream[] getStreams() {
 if( !connected) {
 throw new java.lang.Error("Source is unconnected.");
 return sources;
 * Initiate data-transfer. The <CODE>start</CODE> method must be
 * called before data is available.
 *(You must call <CODE>connect</CODE> before calling <CODE>start</CODE>.)
 * @exception IOException Thrown if there are IO problems with the source
 * when <CODE>start</CODE> is called.
 public void start() throws IOException {
 * Stop the data-transfer.
 * If the source has not been connected and started,
 * <CODE>stop</CODE> does nothing.
 public void stop() throws IOException {
}

How to capture rtp packet??

Hi,
can someone plz tell me how to capture rtp packets. And also can u tell me how to remove the rtp header. I want to add another header to the rtp packet. I will be glad if u can also send me some code samples too.
Thank you in advance.
bye
R.Ravi Kiran

To Capture the RTP Packet all you need to do is listen for a UDP packet on the destination address and you will be able to receive the data. The Data field is by default 256 bytes long (just to let you know).
So you will send the RTP Packet to Localhost port 4444
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byte[] buf = new byte[256];
DatagramSocket socket = new DatagramSocket(4444);
DatagramPacket packet = new DatagramPacket(buf, buf.length);
socket.receive(packet);
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{color}
{color}

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Capturing RTP sent by JMF with Wireshark

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