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

Bernard Aboba <bernard.aboba@gmail.com> Mon, 05 November 2018 20:46 UTC

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From: Bernard Aboba <bernard.aboba@gmail.com>
Date: Mon, 05 Nov 2018 15:46:20 -0500
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To: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
Cc: Iñaki Baz Castillo <ibc@aliax.net>, RTCWeb IETF <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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Sergio said:

"here could be a way to overcome this by setting all the send encodings
active flag to false when receiving a simulcast offer. Then app can do a
getParameters, get layer num and rids, configure the settings and enable
the desired ones by setting active to true."

[BA] Yes, this makes sense, and from Nil's note, it appears that this is
the way things work now in Firefox.

On Sun, Nov 4, 2018 at 7:37 PM Sergio Garcia Murillo <
sergio.garcia.murillo@gmail.com> wrote:

> there could be a way to overcome this by setting all the send encodings
> active flag to false when receiving a simulcast offer. Then app can do a
> getParameters, get layer num and rids, configure the settings and enable
> the desired ones by setting active to true.
>
> Best regards
> Sergio
>
> El lun., 5 nov. 2018 1:26, Iñaki Baz Castillo <ibc@aliax.net> escribió:
>
>> (On Mon, 5 Nov 2018 at 01:21, Nils Ohlmeier <nohlmeier@mozilla.com>
>> wrote:
>> >
>> > Here is a fiddle which demonstrates that just putting simulcast into
>> the offer, but not calling setEncodings() does not activate simulcast:
>> https://jsfiddle.net/x6qgab87/
>> > So the other side can’t force simulcast on the browser. If you provide
>> me with a demo which shows that it is possible, then that is a bug I’ll
>> happily fix for you.
>>
>> Ok, that's new. I remember many months ago when I reported this (I was
>> in fact producing simulcast based on remote SDP offer) and it was not
>> necessary to call sender.setParameters({ encodings }) after sRD and
>> before createOffer.
>>
>> Ok, this behavior makes more sense. BUT: it's not feasible because you
>> need to use hardcoded/fixed rid values (or manually do SDP parsing).
>>
>>
>> --
>> Iñaki Baz Castillo
>> <ibc@aliax.net>
>>
>> _______________________________________________
>> rtcweb mailing list
>> rtcweb@ietf.org
>> https://www.ietf.org/mailman/listinfo/rtcweb
>>
> _______________________________________________
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> rtcweb@ietf.org
> https://www.ietf.org/mailman/listinfo/rtcweb
>

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