[alsa-devel] [TDM help please] multiplex out a stereo I2S line

[Matt Flax]

Hi there,

Problem is that I need multiplex all 6 channels out a stereo I2S line.

I have a working system ... the CPU thinks it is stereo I2S, but the 
codec thinks it is TDM multichannel. When I aplay a pre-interleaved wav 
file, it works ! Check the video here : 
https://www.kickstarter.com/projects/1250664710/1299781340?token=e465b540

Problem is that I need to multiplex all 6 channels down the stereo I2S 
line. I have tried to do this with the asoundrc by attempting to declare 
the same device 3 times and interleaving there, however have failed.

I am happy to alter my machine driver to implement this ... Is there a 
way to present 3 stereo subdevices to the user, where each of these 
subdevcies is interleaved to form the TDM before sending to the codec ?

Is there perhaps a better or more elegant way to go about this ?

thanks

Matt