[pulseaudio-discuss] Decode SPDIF compressed formats

[Tanu Kaskinen]

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.

-- 
Tanu

https://www.patreon.com/tanuk