JMF Does not release the RTP ports

Question

Hi,
I am working on a program that simply listens RTP messages from the network and play them on a PC. My datasource is created as follows:
String url2= "rtp://127.0.0.1:10000/audio/1";
medialocator=new MediaLocator(url2);
ds=Manager.createDataSource(medialocator);
This ds will later be given to a player for the local playback. It has a flow like this: DS->Processor->DS->Player.
Everything works fine for the first execution. The stream is played. However when I stop the player, processor and even the ds, JMF does not realease the RTP ports. I still can see them in the netstat output. Heres how I try to release the resources:
public void releaseResources(){
try{
if(player!=null){
player.stop();
player.deallocate();
player=null;
if(ds2!=null){
ds2.stop();
ds2.disconnect();
ds2=null;
if(processor!=null){
processor.stop();
processor.removeControllerListener(this);
processor.deallocate();
medialocator=null;
ds=null;
Because of this problem, when I try to do the same thing on the same url after sometime, it gives the error "Cannot create the RTP Session: Can't open local data port: 10000". The ports are released after I shutdown the JVM.
Does anyone have an idea on how to release this ports in the same JVM session?
Thanks a lot,
Murat

Answer 1

DataSource objects open a connection to their source, in your case, a connection to an RTP port. You need to call
ds.disconnect()
on both datasources, but SPECIFICLLY on ds (as opposed to ds2) if you want it to release the port.