The first approach landed here: https://codereview.webrtc.org/1773173002
But it was partially reverted, because it affected the AEC performance, here: https://codereview.webrtc.org/1867483003/
The main difference of this approach is that it doesn't use the 3-band splitting filter in the reverse stream, which seems to be the culprit of the AEC regression.
Also, the 2-band splitting filter has been used for the 32kHz case for a long time without any problem, and this is expanded in the CL to cover the 48kHz case as well.
BUG=webrtc:5725
TBR=tina.legrand@webrtc.org
Review URL: https://codereview.webrtc.org/1865633005
Cr-Commit-Position: refs/heads/master@{#12451}
eb3603bd5e