[Bug 737400] videoscale: Lanczos resizing for NV image format

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=737400
  GStreamer | gst-plugins-base | git

RaviKiran <ravi.kiran> changed:

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--- Comment #3 from RaviKiran <ravi.kiran at samsung.com> 2014-09-26 09:29:02 UTC ---
Created an attachment (id=287133)
 View: https://bugzilla.gnome.org/attachment.cgi?id=287133
 Review: https://bugzilla.gnome.org/review?bug=737400&attachment=287133

lanczos method for NV formats

I used following pipelines to check:
gst-launch-1.0 videotestsrc ! "video/x-raw,format={NV12}, width=320,height=240"
! videoscale method=lanczos ! "video/x-raw,format={NV12}, width=640,height=400"
! videoconvert ! ximagesink

gst-launch-1.0 videotestsrc ! "video/x-raw,format={NV21}, width=320,height=240"
! videoscale method=lanczos ! "video/x-raw,format={NV21}, width=640,height=480"
! videoconvert ! ximagesink

couple of references I came across-
http://www.fourcc.org/yuv.php#NV12
https://wiki.videolan.org/YUV/#Semi-planar

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