[Bug 667222] dvdspu: use refcounting instead of explicit copy

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=667222
  GStreamer | gst-plugins-bad | git

--- Comment #5 from Jan Schmidt <thaytan at mad.scientist.com> 2012-09-30 12:15:37 UTC ---
I think I also thought at one point about making the render functions do the
dup'ing as they go if necessary: They can dup across several lines of the frame
into the destination buffer, then render the overlay onto them which saves some
cache thrashing.

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