commit aabd036ecb82f010497f28a4fc1116f65aab881c
author Amit Hilbuch <amithi@webrtc.org> Fri Mar 01 21:14:46 2019
committer Commit Bot <commit-bot@chromium.org> Fri Mar 01 22:44:36 2019
tree 61392e819ab3dbbcd87dc15ba3431599ce78c4dd
parent b1ae10b172b8466c2c436126c4114096ba9e6961

Simulcast should be disabled if RID header extension is not supported.

Simulcast is disabled if the RIDs are not negotiated.
This change addresses the scenario in which RIDs are negotiated but
support for the RID extension is not negotiated.
In such cases, the RID extension cannot be used, so support for
simulcast should be turned off, as if RIDs were not negotiated.

A similar case can be made for MIDs, however MIDs are not explicitly
specified in simulcast. RIDs are only guaranteed to be  unique within
a media section so it would seem that MIDs should be required.
However, applications supply RID values and can guarantee their
uniqueness, so unlike RIDs, the use of MIDs is not enforced as mandatory.

Bug: webrtc:10075
Change-Id: Ic1b27878ea152eaee43a38bbfda11144307766fe
Reviewed-on: https://webrtc-review.googlesource.com/c/125176
Commit-Queue: Amit Hilbuch <amithi@webrtc.org>
Reviewed-by: Seth Hampson <shampson@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#26934}