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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #6 from Aaron Boxer <boxerab at gmail.com> ---
Thanks for the review. On disk, alpha is invariably the last channel.
But, J2K has a colour definition box that can remap the channels, have
multiple alphas, or no alpha......

This would add another layer of complexity, but I could parse the box,
map the colours correctly, and deal with images with multiple alphas,
or four channels and no alpha. But, I have never seen such.

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