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Re: [rtcweb] How to get a diff between the remote SDP in an established session and a new received SDP offer

Iñaki Baz Castillo <ibc@aliax.net> Fri, 06 July 2012 07:33 UTC

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From: Iñaki Baz Castillo <ibc@aliax.net>
Date: Fri, 06 Jul 2012 09:33:22 +0200
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To: rtcweb@ietf.org
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Subject: Re: [rtcweb] How to get a diff between the remote SDP in an established session and a new received SDP offer
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Hi, I would really appreciate some explanation about this subject.
Basically the aim of my question is to imitate the behavior of
existing chat+audio+video clients in which the session is initially
started with just audio, and video is added later (by asking for user
consent).

I hope that raw parsing of the received SDP is not needed for achieving this :)

Regards.


2012/7/4 Iñaki Baz Castillo <ibc@aliax.net>:
> Hi, let's assume I have an established audio session. Later the remote
> sends me a new SDP offer (let's say a SIP re-INVITE) and I want to
> analyze what is new in the new SDP (in order to ask the user for
> consent). So for example when the new SDP arrives I need to know
> whether it contains audio and video or whatever.
>
> With the current JSEP API I see no way. The only I can do with the new
> received SDP is:
>
>   pc.setRemoteDescription(SDP_OFFER, REMOTE_SDP_TEXT)
>
> but this would alter my multimedia session before I can ask my user
> for consent. Do I miss something?
>
> And I would also like to know whether the received SDP contains
> dissabled streams (i.e. a video stream with port 0) before accepting
> it. Basically I want a mechanism for getting a diff between the
> existing remote SDP and the new received one.
>
> --
> Iñaki Baz Castillo
> <ibc@aliax.net>



-- 
Iñaki Baz Castillo
<ibc@aliax.net>

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