[Bug 792897] wasapi: Implement multichannel support and a device provider

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792897

Sebastian Dröge (slomo) <slomo at coaxion.net> changed:

           What    |Removed                     |Added
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                 CC|                            |slomo at coaxion.net

--- Comment #7 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Nirbheek Chauhan from comment #5)

> > Considering the code further below, it might be easiest to just define a
> > mapping table between WASAPI and GStreamer, and use that for all cases. Now
> > you special-case <= 9 channels in a weird way
> > 
> 
> I couldn't immediately think of a clean way to also populate the positions
> array at the same time without having a bunch of ugly macros. Do you have
> suggestions?

You just do a table

struct {
  guint64 wasapi_enum;
  GstAudioChannelPosition gst_enum;
} positions[] = {
  { WASAPI_FRONT_LEFT, GST_FRONT_LEFT },
  ...
};

And then iterate over that to find the correct matches and build your channel
positions array, channel mask, etc.

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