commit 612445ea6038c4746b8696b47447445b82b99c7a
author Tomas Gunnarsson <tommi@webrtc.org> Mon Sep 21 12:31:23 2020
committer Commit Bot <commit-bot@chromium.org> Mon Sep 21 13:29:53 2020
tree 8531d17f553eda73fcbf2c78eea6d9ad1aa0f75a
parent 023e1ac7bc8e0039cc2db472031c1bbe89e80ac8

Remove use of asyncinvoker from WebRtcVideoSendStream.

This turned out to be a bit complicated, mostly
related to the tests, but here's what's changed:

* No AsyncInvoker (and avoid ClearInternal) in
  WebRtcVideoSendStream (WVSS)
* The reason it was there is due to a "design leak" from
  VideoSourceSinkController/VideoStreamEncoder where the former uses
  locks in all methods and is unaware of a threading model. That design
  affected downstream objects, pushed the need for an async hop into
  WVSS and added a lock.
  A suggestion was made to address this in a follow-up change, here:
  https://webrtc-review.googlesource.com/c/src/+/165684
* All methods in VideoSourceSinkController are now called on a known
  and checked sequence and this CL removes the lock. This also makes
  checking state consistent (i.e. calling a getter twice in a row on the
  same sequence, will always return the same value, avoiding race with
  other threads).
* Handling of reporting state changes from the encoder queue to the
  VSSC, is done by VideoStreamEncoder.
* VideoSendStreamImpl is still instantiated on the incorrect thread [1]
  but has two initialization steps [2]. The second one already runs on
  the right thread. Addressing that TODO [1] is something we should do
  but it has side effects to consider. For the purposes of this CL
  the steps relating to the encoder (setting the sink pointer) have
  been moved to [2].

[1] https://source.chromium.org/chromium/chromium/src/+/master:third_party/webrtc/video/video_send_stream.cc;l=94
[2] https://source.chromium.org/chromium/chromium/src/+/master:third_party/webrtc/video/video_send_stream.cc;drc=f4a9991cce74a37d006438ec0e366313ed33162e;l=115

Bug: webrtc:11222, webrtc:11908
Change-Id: Ie46d46e3a52bbe225951b4bd580ecb8cc9cad873
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/184508
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32150}