[Live-devel] Problem of multi streamers with same mutil-cast address and port number.

[Ross Finlayson]

At 09:36 AM 2/23/05, you wrote:
>I have succeeded to use LiveMedia to implement a streamer and a receiver. 
>However, my case is for several parts to talk together. The requirement is 
>to use only one mutil-cast address (include port number). What is the 
>interface in LiveMedia for the receiver to distinguish data from different 
>streamers in different PCs, when using the same multi-cast IP and Port?

The standard way to do this is using the RTP "SSRC" field in each incoming 
RTP packet to distinguish between different senders.

Unfortunately, however, this isn't well-supported in the current LIVE.COM 
code, because the code currently assumes a single sequence number space 
shared by all incoming packets, rather than one sequence number space for 
each sender SSRC.

However, for now you can probably get what you want by:
1/ Calling MultiFramedRTPSource::setPacketReorderingThresholdTime(0) on the 
RTP source, just after it's created, and
2/ Have your receiving code call "RTPSource::lastReceivedSSRC()" whenever 
it gets new data, to get the receiver's "SSRC" (that it can use to 
demultiplex the incoming data, based on sender).


	Ross Finlayson
	LIVE.COM
	<http://www.live.com/>