[Bug 704083] Improve GstBuffer/GstVideoFrame mappings for HW surfaces

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704083
  GStreamer | gstreamer (core) | git

--- Comment #16 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-11-20 08:55:35 UTC ---
Fir mapping write-only, then unmapping and then mapping read-only or read-write
will potentially cause uploading of the data to the hardware and then
downloading it again. That does not seem ideal either.

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