[Bug 796106] video: Support alternate interlaced video

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796106

--- Comment #28 from Zeeshan Ali (Khattak) <zeeshanak at gnome.org> ---
Created attachment 373404
  --> https://bugzilla.gnome.org/attachment.cgi?id=373404&action=edit
video: Add GST_VIDEO_INFO_FIELD_HEIGHT() macro

Add a new macro that gives you the height of a field. It returns the
height of the full frame unless split-field (alternate) interlacing is
in use. Also GST_VIDEO_INFO_COMP_HEIGHT macro now uses this new macro to
get the height for its calculation.

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