[Bug 737579] New: v4l2object: set colorspace for output devices

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=737579
  GStreamer | gst-plugins-good | git

           Summary: v4l2object: set colorspace for output devices
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: aurelien.zanelli at parrot.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


When the v4l2 device is an output device, the application shall set the
colorspace.

So I modify the gst_v4l2_object_set_format() to map GStreamer colorimetry info
to V4L2 colorspace for output devices.
If we have no colorimetry information, I try to guess it using the pixelformat
(YUV or RGB) and the video width and height.

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