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

[Sergio Garcia Murillo <[e-mail]>]

On 05/11/2018 12:45, Harald Alvestrand wrote:
> I do fear that simulcast will continue to affect parts of the spec that
> we don't expect it to. But we don't have the luxury of specifying it
> halfway; either we rip it out altogether, or we specify it in enough
> detail for interoperable implementation.

I agree to that. If we are able to find an "easy" (i.e. not introducing 
too many changes) I would not have any issues adding support to that.

Something like:

- Browser adds a track via addTrack

- Browser call SRD with a recv simulcast m-line offer

- The transceiver is created with one send encoding per rid offered by 
the SFU with default values and all send encodings except first one with 
active=false (this would be the only required change)

----- browser encodes/sends a single rtp stream, same as if the remote 
offer was a non simulcast stream--

-Browser calls sender.getParameters(), modifies the desired send 
encoding parameters ( scaleResolutionDownBy,  maxFramerate, maxBitrate, 
etc) and enables them by setting active=true

Would this approach fulfill the requirements?

Best regards

Sergio