[Live-devel] live555MediaServer: RTP source address does not match RTSP source address

[David Stegbauer]

Hello Ross,

when I run live555MediaServer on linux, it listens on all network interfaces. 
Lets say I have two: 172.16.105.9 and 172.16.105.3.
Lets suppose I start RTSP communication  from RTSP client (openRTSP on 
172.16.105.8) to server on 172.16.105.9. Client sends SETUP command, server 
responds and there is header
Transport: 
RTP/AVP;unicast;destination=172.16.105.8;source=172.16.105.9;client_port=10004-10005;server_port=6970-6971
So far so good.
But now in response to PLAY, the live555MediaServer starts to transmit RTP 
packets from interface 172.16.105.3. See attached dump, can be viewed by 
wireshark.

I have analyzed the code and I think the problem is that the RTP source socket 
(in live555MediaServer) has INADDR_ANY.
As a quick hack I have patched RTSPServer.cpp, see attachment. I know that the 
preferred way is to subclass, I do not ask for inclusion, I just ask for your 
advice.

My questions are:
 Am I really supposed to set SendingInterfaceAddr and ReceivingInterfaceAddr 
(defined in GroupSockHelper.cpp lines 35-36)?
 Are there any undesirable interferences between RTSPServer::RTSPClientSession 
instances if I use my hack? I don't see any as live555 is not multithread.
 Do you suggest to me to subclass, to use the above mentioned hack, or even to 
modify GroupSockHelper.cpp (setupDatagramSocket, socketJoinGroup, 
socketJoinGroupSSM) and OnDemandServerMediaSubsession
::getStreamParameters?

Best Regards
David Stegbauer


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