[Bug 687350] New: Add nv12/nv21 converter to i420

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=687350
  GStreamer | gst-plugins-base | 0.10.x

           Summary: Add nv12/nv21 converter to i420
    Classification: Platform
           Product: GStreamer
           Version: 0.10.x
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: nicolas.dufresne at collabora.co.uk
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=227813)
 View: https://bugzilla.gnome.org/attachment.cgi?id=227813
 Review: https://bugzilla.gnome.org/review?bug=687350&attachment=227813

ffmpegcolorspace: Add NV12/NV21 to I420 convertion

NV12/NV21 is the same format as i420, but with different byte placement.
Currently in ffmpegcolorspace it get converted in two step NV12 -> RGB -> I420.
I wrote converters for this, so we can get more decent performance when
encoders are that picky.

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