[Bug 773433] video-format: add API to check if a video format is "sparse"

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773433

--- Comment #13 from Philippe Renon <philippe_renon at yahoo.fr> ---
BGRA (and RGBA) work ok because GST_VIDEO_INFO_N_COMPONENTS reports 4 channels
for these formats. Again if the alpha channel is not the last then things
probably start to fail.

The proposed fix simply tries to do the same for BGRx (i.e. bring support of
BGRx to the level of support found for BGRA).

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