[pulseaudio-discuss] Decode SPDIF compressed formats

Tanu Kaskinen tanuk at iki.fi
Thu Jul 20 15:06:44 UTC 2017

On Wed, 2017-07-19 at 17:29 +0200, Denis Shulyaka wrote:
> 2017-07-12 22:58 GMT+02:00 Tanu Kaskinen <tanuk at iki.fi>:
> > I don't know how the endpoints are supposed to agree on the format, and
> > what kind of interface alsa provides for that (if any). The alsa-devel
> > list might be more appropriate for questions about spdif details.
> > 
> I've raised this question to alsa-user mail list, here is the response I
> got (
> http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg32163.html):
> > There would be a mixer control "IEC958 Capture Default" associated with
> > the PCM device (i.e., not a real mixer control visible in alsamixer),
> > containing the channel status bits; the "IEC958 Capture Mask" control
> > defines which bits are valid.

Interesting to know.

> Although it is not yet supported for USB cards, is pulseaudio able to read
> this information and provide it to applications?

No, I don't think there's currently any code to read the status bits
from the alsa mixer.



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