> I want my application to be able to stream different streams of the same
> type, but with different attributes. For example, I want to stream a
> 44100khz PCM and a 22050khz PCM. The application that receives the stream
> will play the one selected by the user. The question is how can I add this
> information to the SDP description. Should I create one for every type e.g.
> PCM 16 44100 stereo, PCM 8 22050 mono and add it to the lookupPayloadFormat
> function in MediaSession.cpp? What about the information not provided for in
> the function, such as kpbs?
You (the server developer) don't deal with SDP descriptions directly; our
software takes care of this for you.
Because you want your server to support streaming different streams (selected
by the user), these should be separate "ServerMediaSession" objects (each with
a separate stream name). Each of these "ServerMediaSession" objects will have
a single "ServerMediaSubsession" (subclass) member.
You, as a server developer, will need to define and implement your own
"ServerMediaSubsession" subclass for your PCM streams. You may find it useful
to use the "WAVAudioFileServerMediaSubsession" code as a model for this. As
always, you will need to implement the virtual functions
"createNewStreamSource()" and "createNewRTPSink()". In particular, you will
implement "createNewRTPSink()" by calling
SimpleRTPSink::createNew()
with appropriate parameters (again, you may find it useful to use the
"WAVAudioFileServerMediaSubsession" code as a model). Our server code will
automatically generate an appropriate SDP description for each stream, based on
the parameters that you gave to "SimpleRTPSink::createNew()".
Your RTSP client can then access the desired stream by including the desired
stream name in the "rtsp://" URL.
Note that you should not need to modify *any* of our library code to develop
your server or client.
Ross Finlayson
Live Networks, Inc.
http://www.live555.com/
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