Now checks the preferred channel configuration and requests implicit channel
upmixing (audio engine extends from 2 to N channels internally) if the
preferred number of channels is larger than two; i.e., initialize the
stream in stereo even if the preferred configuration is multi-channel.
To summarize: with this CL, it is now possible to use e.g. a 7.1 headset
with a native WebRTC client. All internal processing in WebRTC will be in
stereo, and the audio device will be opened up in stereo as well to match
WebRTC. Before this change, we would open up the audio device using 8
channels but that was not supported by WebRTC.
Bug: webrtc:9265
Change-Id: I1530fee28c4b8b5cda29ab6baf8d65fd391d935d
Reviewed-on: https://webrtc-review.googlesource.com/98421
Commit-Queue: Henrik Andreassson <henrika@webrtc.org>
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24743}
c7d935899a