[xiph-rtp] linphone-1.5.0 mostly complies to theora over RTP draft

[Simon Morlat]

Hello,

Finally after all the discussions we had together here, and the clarifications 
you made to me, I implemented a compliant theora-RTP usage into 
linphone-1.5.0 (an audio/video SIP phone).
It's in file mediastreamer2/src/theora.c for those who are curious.
- it uses the packed conf technique (which I still found the easiest and more 
flexible way in a SIP/SDP context )
- unfortunately I said "mostly compliant" because it won't accept several 
theora frames grouped into one single RTP packet... Maybe a SDP parameters 
suchs a=fmtp:XX maxframes=1 would be necessary to indicate this limitations 
to the remote implementation.
- in order to dynamically limit bandwidth according to capabilities of both 
sides, I used the b=AS SDP header, which is the most suitable technique whose 
meaning is independant from any codec details.

No interroperability test yet, perhaps linphone is the first SIP videophone 
using theora. Have you heard of any other ?
So there may be some bugs...

See http://www.linphone.org

Thanks to everybody here who made this possible,

Simon