[Bug 783591] openjpegdec: doesn't support grayscale with alpha

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783591

--- Comment #10 from Aaron Boxer <boxerab at gmail.com> ---
I think at the moment, we can just limit support to single alpha channel for
gray or RGB, and alpha must be the final channel. Hopefully that is not too
heavy-handed :)

In the wild, my feeling is that 99% of all disk files are stored in this
format.

I have updated the patch to do this checking, (I also corrected video format in
a few places so that is consistently AXXX format, since all of the fill_frame
methods expect output alpha to be stored in first component).

I have added a comment about how to determine pre-multiplied alpha, but don't
know how to store this in GstVideoMeta.

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