Hi all,
Scenario: can't capture which PA in mono format with Analog ALC272
codec.
Root cause: The h/w only works as stereo, so remap_channels remap
stereo to mono by simply add one channel to another. Unfortunately, the 2
channels are 180 degree phase different so the sum is always very very close to
zero.
But Mono capture works fine with pure alsa at the same platform without
PA. I looked at the pcm_route.c of alsa-lib, it also just simply add two
channels with some weight for each channel. Anybody can tell me what magic is
done by ALSA before I have to dig into the code? :-). Did I miss something?
Or what is the general solution to solve this. I am considering some way
To detect the phase difference of channels.
Cheers.
Long
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