[Bug 783625] typefinding: add support for jpc or j2c

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=783625

--- Comment #7 from Aaron Boxer <boxerab at gmail.com> ---
Created attachment 353646
  --> https://bugzilla.gnome.org/attachment.cgi?id=353646&action=edit
typefind: handle jpc format

This patch, unfortunately, fails on the following pipeline:

gst-launch-1.0 -v filesrc location=some.j2k ! typefind ! openjpegdec !
imagefreeze ! autovideosink

The following file can be used for testing:

https://github.com/GrokImageCompression/grok-test-data/blob/master/input/nonregression/Bretagne2.j2k

(a j2k file is the same as a jpc file)

typefind *is* detecting the file as jpc, but negotiation still fails.

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