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.
Bug: webrtc:10977
Change-Id: Ie2555210c0368a1d3c51ddf6670d0052e6d679de
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/153483
Commit-Queue: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29296}
88fe84b7fb