Re: [Linphone-developers] Mediastreamer newbie seeks clue.

[Herb Peyerl]

On Sep 1, 2010, at 9:13 AM, Matt Gilg wrote:                                    
                                             
                                                                                
                                             
> Just downloaded the updated source, this looks cool actually.                 
>                                              
> msaudiomixer appears to be a filter that you can connect multiple             
>                                              
> sources to.  My guess is that the chain might look like this:                 
>                                              
>                                                                               
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> rtp1->decoder1->dtmf1->audiomixer(PIN 1)->soundread                           
>                                              
> rtp2->decoder2->dtmf2->audiomixer(PIN 2)->soundread                           
>                                              
>                                                                               
>                                              
> Looks like there is a method in the filter to control the gain on             
>                                              
> each pin, and users can use up to 20 simultaneous channels.                   
>                                              
                                                                                
                                             
                                                                                
                                             
So according to the source, if multiple SSRC's are received within              
                                             
a single RtpSession, then oRTP changes the SSRC assigned to the                 
                                             
session... But it is my understanding that an RTP session can have              
                                             
multiple SSRC's... ie: if multiple senders are sending to a single              
                                             
localport in a multicast group...                                               
                                             
                                                                                
                                             
So if I want to mix multiple streams from the same host (different              
                                             
talkers on the same host) in the same session (picture up to 8                  
                                             
hosts, each with up to 2 talkers, all communicating in the same                 
                                             
RTP session how do I handle that?  Assume the streams can start at              
                                             
any time...                                                                     
                                             
                                                                                
                                             
I'm thinking I need to set a callback for ssrc_changed, and then                
                                             
allocate a new RtpSession for that ssrc, stop the ticker, add the               
                                             
new RtpSession into the audiomixer and start everything back up                 
                                             
again?