commit 992a96f68e4cadc69ff85ffe85500010e761e2bd
author Gustaf Ullberg <gustaf@webrtc.org> Tue Dec 08 12:03:55 2020
committer Commit Bot <commit-bot@chromium.org> Tue Dec 08 15:05:23 2020
tree 3a263726ccd06c2d47ca8cce572117275a75e7ae
parent 04ed0a0773a364e7676db87396f308264cc35d7e

AEC3: Prevent diverging coarse filter from influencing the refined filter

After the refined filter has been determined to perform better than
the coarse filter, and the coefficients of the coarse filters are
overwritten by the ones from the refined filter, at least 100 ms have
to pass before the adaptation of the refined filter is allowed to speed
up due to good coarse filter performance.

This change solves the vicious circle described in webrtc:12265, where
the coarse and refined filters can diverge over time.

This feature can be disabled remotely via a kill-switch. When disabled
the AEC output is bit-exact to before the change.

Bug: webrtc:12265,chromium:1155477
Change-Id: Iacd6e325e987dd8a475bb3e8163fee714c65b20a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/196501
Reviewed-by: Per Åhgren <peah@webrtc.org>
Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32801}