Hi all,

As far as I know, some SoCs can only work in mono or stereo mode at one time. So if we let them capture a mono stream while playing a stereo stream, there might be a problem occur to one of these two streams: double-paced or slowed down.

I just want to ask: Is there any existing solution for the case?

In soc-pcm.c, we have soc_pcm_apply_symmetry() to solve unmatched sample rates situation for simultaneous playback and capture. But we don't have one for channels. Is that reasonable to add a similar one for it?

Likewise, we can treat symmetric_rate as a solution for those SoCs or CODECs which can not handle asymmetrical LRCLK. But it's also impossible for them to handle asymmetrical BCLK. And accodring to BCLK = LRCLK * channel number * slot size(fixed or sample bits), sample bits might also be a problem if they are not using a fixed slot size.

Thank you, Nicolin Chen