[pulseaudio-discuss] Decode SPDIF compressed formats

Denis Shulyaka shulyaka at gmail.com
Wed Jul 19 15:29:56 UTC 2017

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 (

> 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.

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

Best regards,
Denis Shulyaka
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