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Re: [rtcweb] JSEP question: How to set up simulcast for server-originated calls?

Iñaki Baz Castillo <ibc@aliax.net> Mon, 05 November 2018 12:12 UTC

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In-Reply-To: <5db76ada-b896-7eba-b42e-85b2e239dc42@alvestrand.no>
From: Iñaki Baz Castillo <ibc@aliax.net>
Date: Mon, 05 Nov 2018 13:11:55 +0100
Message-ID: <CALiegfmdxHVqndRYRP-gmTGKFweTdpPPGVOFBCPM7CpvLvVeYw@mail.gmail.com>
To: Harald Alvestrand <harald@alvestrand.no>
Cc: sergio.garcia.murillo@gmail.com, rtcweb@ietf.org
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Subject: Re: [rtcweb] JSEP question: How to set up simulcast for server-originated calls?
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On Mon, 5 Nov 2018 at 12:45, Harald Alvestrand <harald@alvestrand.no> wrote:
>
> On 11/05/2018 10:03 AM, Sergio Garcia Murillo wrote:
> > I am not talking about replacing a transceiver but adding a new one
> > and renegotiate. The initial O/A will drop the simulcast attribute on
> > the answer and create a recvonly transceiver, and then create a new
> > transceiver with simulcast encoding that will require a O/A.

> OK, so we have the same picture in mind of what will happen in your
> proposal. We end up with an useless transceiver and a new transceiver
> that is suggested by the browser end, in a new media section; it's
> impossible to use the media section that the (initiating) server proposed.
>
> That seems ugly.

So:

- receive a remote offer with a single m=video section requesting
local simulcast
- reply with a=recvonly (fxxx you, conference server)
- reoffer with a new m=video with "correlated" simulcast settings
- have the conference server like that

And... all this party instead of just telling the client (via custom
messaging before it "joins" the conference) the desired simulcast
settings? :)


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

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