[Bug 670741] basetransform: save downstream metadata supported APIs

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=670741
  GStreamer | gstreamer (core) | 0.11.x

--- Comment #2 from Philippe Normand <phil at base-art.net> 2012-02-24 13:17:48 UTC ---
Created an attachment (id=208343)
 View: https://bugzilla.gnome.org/attachment.cgi?id=208343
 Review: https://bugzilla.gnome.org/review?bug=670741&attachment=208343

videofilter: forward downstream supported metadata APIs

Implement the copy_metadata vfunc and copy the supported metadata to
the transformed buffer.

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