[Bug 738914] video: Add a linear/affine transformation matrix meta

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=738914

--- Comment #4 from Matthew Waters <ystreet00 at gmail.com> ---
As for software elements wanting to support the meta, there are a couple of
options.
1. Don't ;)
2. Add new meta's that can be up-converted to the 4x4 transformation meta.
3. Attempt to decompose the 4x4 matrix into the separate transformations (very
hard)
4. Add multiple transformations to the buffer for each scale/rotate/crop/etc
(where supported) and have an id system to describe the order
5. Add a meta ordering meta where other meta's can be added to a buffer and
ordered based on some priority system to say before/after memory map/access,
other meta operations, etc.  Maybe the meta tag system could be used for this
(have not seen it used successfully for much yet)?

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