[Bug 751639] video: Add a "crop" GstMeta transform type

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751639

Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> changed:

           What    |Removed                     |Added
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 Attachment #309941|none                        |needs-work
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--- Comment #4 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Review of attachment 309941:
 --> (https://bugzilla.gnome.org/review?bug=751639&attachment=309941)

To be useful, we need an implementation for all registered video meta. Also to
prove it can works. ROI should be trivial, I think
GstVideoOverlayCompositionMeta is the most important here. As videocrop now
handle cropping on top of an existing crop, it would be nice proof of concept
to also port that element.

::: gst-libs/gst/video/gstvideometa.c
@@ +488,3 @@

+/**
+ * gst_video_meta_transform_scale_get_quark:

transform_crop_get_quark

@@ +490,3 @@
+ * gst_video_meta_transform_scale_get_quark:
+ *
+ * Get the #GQuark for the "gst-video-scale" metadata transform operation.

Typo "gst-video-crop"

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