commit bc8049ef0bc692c1ed3cb3b665b8fa56f51492df
author Ilya Nikolaevskiy <ilnik@webrtc.org> Wed Sep 25 09:10:33 2019
committer Commit Bot <commit-bot@chromium.org> Fri Sep 27 09:28:38 2019
tree 8819ab8a0fb5d2b79376e306f225926024f62559
parent e72a78e4b276d015a4cc22a1e249b8916532b9d5

Reland "VP9 encoder: handle disabled layers correctly"

Now vp9 screenshare would enable new layers as soon as requested and will force all spatial layers present on the next frame, even if they should be dropped because of frame-rate limiting.

This might cause frame-rate liming to be exceeded if layer is toggling on and off very often, but this situation is bad itself. E.g. in realtime video it will cause too many key-frames.

Now SvcRateAllocator and VP9EncoderImpl are aware that there may be some skipped layers before the first enabled. Key-frames and ss_info triggering logic is also updated.

(This is a reland without changes after updates to downstream projects)
Original-Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153483

Bug: webrtc:10977
Change-Id: I02459c5982da2e0542a837514f5753c5f96401c6
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/154355
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29330}