Bug 173262 – Activate simulcast through addTransceiver

• Status: RESOLVED
• Resolution: FIXED
• Component: WebRTC

[Gustavo Garcia]

Overview:
I seems like Safari TP 33 has no support for simulcast streaming, which would be required for multiparty scenarios.  This is supported in Chrome and Firefox for VP8 and there is a patch in progress to add support also for H.264 [1]

The standard way to add simulcast support would be using RtpSender encodings + RID header extensions in the RTP packets [2]

Actual Result:
There is no way to enable simulcast in Safari for H.264.

Expected Result:
Safari supports simulcast for H.264 (and also VP8 if support for that is eventually added)

Build Date & Hardware:
Safari TP 33 on macOS 10.12.5

[1] https://bugs.chromium.org/p/webrtc/issues/detail?id=5840
[2] https://www.w3.org/TR/webrtc/#simulcast-example

[Radar WebKit Bug Importer]

<rdar://problem/32713416>

[Philip Jägenstedt]

FYI, there's an "Intent to Implement and Ship: Simulcast with PeerConnection AddTranceiver API in WebRTC" for this on blink-dev now:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/N31xFKvgbck/h5G0a9RqAQAJ

[youenn fablet]

Simulcast activation through munging is supported.
The plan is to transition to addTransceiver

[youenn fablet]

Created attachment 418257 [details]
Patch

[EWS]

Committed r271797: <https://trac.webkit.org/changeset/271797>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 418257 [details].