[Bug 780100] video: add support for BGR and BGRA formats with 12 bits per channel

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=780100

--- Comment #4 from emeric.grange at gmail.com ---
(In reply to Sebastian Dröge (slomo) from comment #2)
> You say it's WIP. Do you need any help with any parts of it? What parts are
> missing?
> 
> From a (very fast) look over the patch, it looks like it does all the right
> things but I'll take a closer look later. While we're at it, we might also
> want to add GBRA_10LE/BE formats though, for consistency :)

I was only able to build the patch on today's git, not test it, that's why the
WIP. I think I have an unrelated problem with gst-libav (all my attempts are
ending up with "libav :0:: get_buffer() failed" even when not trying CineForm
videos.
If I use my own CineForm plugin (or any other plugins from good) I end up stuck
on "Redistribute latency...".

Regarding the first patch, it's mostly copy/past but I'm not sure about the
GST_VIDEO_PACK_FLAG_TRUNCATE_RANGE section. I'll add GBRA_10LE/BE tomorrow.
For the second patch, I'm not sure about the "swap" approach alltogether.

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