[Asterisk-video] SDP changes

[John Martin]

Hi Olle,
  I've been looking some more at the forward video leg. In a call where
we have:

  Phone1 -> (Peer1 - Ast - Peer2) -> Phone2

I can get Phone2 to answer with the union of all the capabilities set at
each point (i.e. the lower of all caps Phone1, AstPeer1, AstPeer2 and
Phone2).

I've also just today got the reverse leg of the call going - i.e. if
AstPeer1, AstPeer2 or Phone2 have a lower capability than Phone1 then
Phone1 will be told about it in the Ack/SDP. This works if either phone
is SIP or H.323.

Capabilities are negotiated for video/audio, video resolution, video
framerate and video codec (I'll assume audio codec negotiation is
already covered).

The reverse leg of the call is negotiated using 

ast_queue_control(chan, AST_CONTROL_CAPFLAG | capability);

Where AST_CONTROL_CAPFLAG is (AST_MAX_VIDEO << 1)

This is a bit of a hack at the moment, I'm now in the process of
updating to trunk so I can get Kevin's new ast_indicate with payload.

John

John Martin
John.Martin at AuPix.com
http://www.AuPix.com

-----Original Message-----
From: asterisk-video-bounces at lists.digium.com
[mailto:asterisk-video-bounces at lists.digium.com] On Behalf Of Olle E
Johansson
Sent: 24 May 2006 19:16
To: Discussion in Asterisk of video media support
Subject: [Asterisk-video] SDP changes

While I terrorize my students with evil IAX2 labs, I work a bit more  
on my
SDPcleanup code.

The idea is twofold:

- Not change the call if we get a re-invite we can't accept
- Not offer video on outbound call leg if there's no video inbound

This code is in the svn branch http://svn.digium.com/svn/asterisk/ 
team/oej/sdpcleanup

Feel free to test and give input on what to do. I feel I am close,  
but still do a lot of
debugging to get rid of the video offer on the outbound call leg.

Thanks for your help.

After this is fixed and committed, I'll start working with all of you  
to add
FMTP support, based on the patches from John Martin.

Greetings from New Jersey!

/O
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