[Bug 779805] alsasink: add SND_PCM_FORMAT_DSD support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779805

--- Comment #9 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to n-matsumoto from comment #8)

> No1) Can those convert it.
> DSD_U8,DSD_U{16,32}_{LE,BE}
> If I resolve it, May I ask alsa-dev.

I don't understand your question. You mean if you can convert between these
formats? Probably. But even then you still need to implement conversion from/to
PCM (F64 and S32).

> No2) x-raw is PCM? is it correct?
> https://gstreamer.freedesktop.org/documentation/plugin-development/advanced/
> media-types.html

It's currently only PCM, yes. But as DSD is also raw audio, it would also fit
in there IMHO.

> No3) convert is not decode. is it correct?
> I think that pcm and dsd are not compatible. 
> so, I think those can't convert.It's mean not convert,but decode.
> because, I think that I can't select optionB

PCM and DSD are both (raw) audio formats so (lossy!) conversion between them is
possible. I wouldn't call any of it decoding/encoding though as they are both
equivalent formats, none of the two is the "encoded" one.

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