[Webkit-unassigned] [Bug 212938] New: [WebRTC] Add new render stats: rtcvideoreceiverstats and frameRate

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=212938

            Bug ID: 212938
           Summary: [WebRTC] Add new render stats: rtcvideoreceiverstats
                    and frameRate
           Product: WebKit
           Version: Safari 13
          Hardware: iPhone / iPad
                OS: iOS 13
            Status: NEW
          Severity: Major
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: charob at amazon.com
                CC: youennf at gmail.com

Please refer to: https://w3c.github.io/webrtc-provisional-stats/#dom-rtcvideoreceiverstats

WebRTC can expose some video rendered statistics such as: 

1- freezeCount:
Count the total number of video freezes experienced by this receiver. It is a freeze if frame duration, which is time interval between two consecutively rendered frames, is equal or exceeds Max(3 * avg_frame_duration_ms, avg_frame_duration_ms + 150), where avg_frame_duration_ms is linear average of durations of last 30 rendered frames.

2- pauseCount:
Count the total number of video pauses experienced by this receiver. Video is considered to be paused if time passed since last received packet exceeds 5 seconds.

3- totalFreezesDuration:
Total duration of rendered frames which are considered as frozen (for definition of freeze see freezeCount), in seconds. This value is updated when a frame is rendered.

4- totalPausesDuration:
Total duration of pauses (for definition of pause see pauseCount), in seconds. This value is updated when a frame is rendered.

5- totalFramesDuration:
Total duration of all rendered video frames, in seconds. This value is updated when a frame is rendered.

6- sumOfSquaredFramesDuration:
Sum of squared duration of all rendered frames. It can be used to calculate harmonic frame rate:

totalFramesDuration / sumOfSquaredFrameDurations

This value is updated when a frame is rendered.


And ultimately it would be optimal to have a frameRate stat available as well.

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