tree 6c599caab21725ad3fa678a9dda9e14f7b93d36e
parent 6efb0310ec1552ab3098a6ecd519754abe4fd063
author Erik Språng <sprang@webrtc.org> 1606928254 +0100
committer Commit Bot <commit-bot@chromium.org> 1606936857 +0000

Adds experimental libvpx VP9 speed settings.

Using the field trial WebRTC-VP9-PerformanceFlags, this CL allows you to
configure the libvpx VP9 encoder with a list of flags to affect the
quality vs speed tradeoff. This CL adds support for:

* Speed (effort), for the temporal base layer frames
* Speed for higher (non-base) layer frames
* De-blocking (as part of the loopfilter) enabled for:
  0 = all frames
  1 = all but frames from the highest temporal layer
  2 = no frames

Each entry in the list has a threshold in min number of pixels needed
for settings in the entry to apply.

Example: Two spatial layers (180p, 360p) with three temporal
layers are configured. Field trial "WebRTC-VP9-PerformanceFlags" set to:
"min_pixel_count:0|129600,base_layer_speed:5|8,high_layer_speed:7|8,deblock_mode:1|2"
This translates to:
S0:
  - TL0: Speed 5, deblocked
  - TL1: Speed 8, deblocked
  - TL2: Speed 8, not deblocked
S1:
  - TL0: Speed 7, not deblocked
  - TL1: Speed 8, not deblocked
  - TL2: Speed 8, not deblocked

Bug: webrtc:11551
Change-Id: Ieef6816d3e0831ff53348ecc4a90260e2ef10422
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/188461
Reviewed-by: Michael Horowitz <mhoro@webrtc.org>
Reviewed-by: Sergey Silkin <ssilkin@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32749}