[Bug 732870] jpegenc: add support for encoding from nv21

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=732870
  GStreamer | gst-plugins-good | 1.x

--- Comment #5 from Nicolas Dufresne <nicolas.dufresne at collabora.co.uk> 2014-07-08 01:09:28 UTC ---
Ok, the trick is that _COMP_DATA() and _PSTRIDE() is being used. Basically we
tell, for NV12, the U starts where the UV plane start, and pixel stride 2 (1
byte padding), and V is the UV planes start + 1.

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