Per Kjellander 3daf696188 Add offset to timestamp from socket
This is to ensure Epoch is the same if transport switch to TCP or another transport.
First packet received will always be timestamped with rtc::TimeMicros.
Other packet timstamps will use the kernel timestamp as an offset from the first packet timestamp.
For BWE, it is important that there is not a large time base diff if transport change.

This change is protected by the experiment WebRTC-SCM-Timestamp.

Bug: webrtc:14066
Change-Id: Iaeb49831e7019e21601bc90895ac56003a54e206
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/281000
Reviewed-by: Evan Shrubsole <eshr@webrtc.org>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38587}
2022-11-09 11:16:33 +00:00
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