[alsa-devel] CM6206, S/PDIF + JACK

Clemens Ladisch clemens at ladisch.de
Tue Nov 13 22:25:34 CET 2012

Dan MacDonald wrote:
> However, I had a quick go at capturing audio from SPDIF and the default
> stereo inputs (after making sure SPDIF in was enabled under alsamixer)
>  this morning but I got nothing. I have zero experience with SPDIF devices
> and Linux (or any other OS) so I dunno what to watch out for

This depends entirely on how the hardware implements the routing.

> In my quick test I was trying to capture audio from a audio CDR so there
> won't have been any copy protection on the disc. CDs are 44.1Khz of course
> but I was running JACK at 48Khz - that shouldn't be an issue should it or
> would I need to run JACK at 44.1 to capture an audio CD via SPDIF? Maybe rt
> resampling isn't supported?

I didn't find a box labeled "high-quality resampler for those lazy Jack
users" in the datasheet ...

> Another thing thats just come to mind is I think that the mic and line
> inputs were also set to capture so maybe I'd need to only enable capture
> for the SPDIF input but nothing else?

In theory, only one input can be enabled at the same time.
What does "amixer contents" show for this device?


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