[Bug 791453] New: videocrop: Add GstVideoCropMeta support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791453

            Bug ID: 791453
           Summary: videocrop: Add GstVideoCropMeta support
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: nicolas at ndufresne.ca
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

This is to avoid copying the data if the crop can be handled by a downstream
element, like xvimagesink, ximagesink or kmssink. I've implemented this
specifically
to be able to test this often untested feature in sinks (kmssink for my case).

Note that it won't apply any crop meta added by let's say a decoder. The reason
is that
it will go passthrough and we have nothing in the caps that would let us know.
This felt like
a project by itself, and I didn't really needed it. If someone needs it, a
short workaround
is to add a disable-passthrough property (or something), but I didn't want to
commit to any API.

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