[LAU] Recording from S/PDIF

[Clemens Ladisch]

David Kastrup wrote:
> Clemens Ladisch <clemens-P6GI/4k7KOmELgA04lAiVw at public.gmane.org>
> writes:
>> David Kastrup wrote:
>>> Does this information get back out of the ALSA driver (I can use
>>> an RME Multiface here) in some manner?
>>
>> As far as I can see, this driver does not give you access to the
>> channel status bits of the capture stream.  (And even C-Media cards
>> give you only the first 32 bits.)
>
> Huh.  Is that an ALSA shortcoming?

No, of the hardware.

> Oh, and what's the deal with Dolby Surround via S/PDIF?  That would
> also need some sort of access different to PCM, wouldn't it?

The Dolby/DTS bits pretend to be an uncompressed stereo stream.  All
that changes is a single channel status bit ("non-audio"), which is
supported by most cards.


Regards,
Clemens