[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 #11 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to Nicolas Dufresne (stormer) from comment #9)

> ::: gst-libs/gst/video/video-format.h
> @@ +103,3 @@
> + * @GST_VIDEO_FORMAT_GBR_12LE: planar 4:4:4 RGB, 12 bits per channel
> + * @GST_VIDEO_FORMAT_GBRA_12BE: planar 4:4:4:4 ARGB, 12 bits per channel
> + * @GST_VIDEO_FORMAT_GBRA_12LE: planar 4:4:4:4 ARGB, 12 bits per channel
> 
> I didn't realize this was planar RGB. I'm thinking out loud here, but could
> we create a notation to differentiate packed RGB from planar RGB. When I
> read the format first, I though it was going to be packed, with 64bit
> pixels, and each component being padded. Clearly this is not the case.
> 
> Other then that, I'm surprised of the component / plane order, but I need to
> document myself.

We already support GBR in various versions, nothing new here :)

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