Add RTP timestamp to RTCRtpReceiver.RTCRtpContributingSource

Category: WebRTC
Type: New or changed feature
Status: Enabled by default (Chrome 76)
Intent stage: Evaluate readiness to ship

Summary

Add RTP timestamp to RTCRtpReceiver.RTCRtpContributingSource. This is additional metadata to the existing RTP source.

Motivation

This is needed to make it possible to link the information in RTCRtpContributingSource to a specific video/audio frame. One use case is a server-client WebRTC system where the client can now synchronize external events to a particular source frame and send this information back to the server.

Standards & signals

Specification: https://w3c.github.io/webrtc-pc/#dom-rtcrtpcontributingsource
Firefox: Positive — Firefox is part of the WebRTC working group that approved the change and is committed to supporting WebRTC 1.0.
Safari: No signal — Committed to supporting WebRTC 1.0.
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=965994

Docs: https://w3c.github.io/webrtc-pc/#dom-rtcrtpcontributingsource

Explainers: This is a very minor addition to an existing API. This is the discussion that lead to the addition of this feature to the WebRTC specification: https://github.com/w3c/webrtc-pc/issues/2177

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