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

Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com> Tue, 06 November 2018 01:10 UTC

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From: Sergio Garcia Murillo <sergio.garcia.murillo@gmail.com>
Date: Tue, 06 Nov 2018 02:10:14 +0100
Message-ID: <CA+ag07ZzFQZ5g4e8ATJxKMRgyCuSZjEKJ6ra3=713h2E2sAp7Q@mail.gmail.com>
To: Harald Alvestrand <harald@alvestrand.no>, Bernard Aboba <bernard.aboba@gmail.com>
Cc: 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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changed my mind, as there is a corner case:

addTrack
setParameters with multiple encodings
SRD with a simulcast recv offer with imcompatible rids than the one in the
transceiver

what will happen then?


El mar., 6 nov. 2018 1:59, Sergio Garcia Murillo <
sergio.garcia.murillo@gmail.com> escribió:

> On 06/11/2018 0:50, Harald Alvestrand wrote:
> >> [BA] Most of the code examples I have seen that use addTrack for
> >> simulcast call setParameters prior to createOffer().  To allow this,
> >> we might consider saying that when addTrack returns, the encodings
> >> are initially null, and so can be set by setParameters().
> >
> > We could also allow the number of encodings to be changed in general,
> > with the proviso that if you increase the number, you have to inspect
> > the result to see how many you got (browser would drop extra elements).
>
> IMHO the number of encodings should be allowed to be changed by
> setParameters (either for a transceiver started via addTrack or
> addTransceiver) until the corresponding m-line is negotiated by an SDP
> O/A (until it has a mid value?). Changing the number of encodings after
> that, I don't think it is allowed by the simulcast draft.
>
> Best regards
>
> Sergio
>
>

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