Here’s the info that @shohara put on GitHub.
Although there is information about “RicMicSelect” and “RicMicSurrondVolumeLevel” in Camera API, they are the settings for AudioManager.
The usage is as below. This is the use case to use 4ch B-format recording.
Here, there is a setting “RicUseBFormat” for enabling 4ch B-format output. Because Android supports only mono (1ch) or stereo (2ch), use “RicUseBFormat=false” if you use normal audio features defined in Android.
This tip and others will be included in an updated Plug-in Developer Community Guide when it is updated at the end of this month.