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w3c / ortc

ORTC Community Group specification repository (see W3C WebRTC for official standards track)
http://www.w3.org/community/ortc/
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Support for RRID #727

Closed aboba closed 7 years ago

aboba commented 7 years ago

As noted in the following message, the RRID is necessary in order to support robustness (RTX/FEC) with simulcast: https://www.ietf.org/mail-archive/web/mmusic/current/msg18035.html

How is the RRID set in an RtpSender/RtpReceiver?

aboba commented 7 years ago

The text suggests that for simulcast the RRID is mandatory-to-use, and that the RRID is set to the value of encodings[].rid. If we can assume that ORTC implementations support RRID according to the specification, there may not be a need to set the RRID in an RtpSender/RtpReceiver.

aboba commented 7 years ago

Currently the rtpunhandled event provides the RID, but not the RRID:

dictionary RTCRtpUnhandledEventInit : EventInit { DOMString muxId; DOMString rid; payloadtype payloadType; unsigned long ssrc; };

What if an unhandled FEC/RTX packet containing the RRID was received?

aboba commented 7 years ago

This is a corner case unlikely to be encountered within existing or planned implementations.