[Bug 745151] videofilter: Added a new plugin to enhance video in NV format

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=745151

Sanjay NM <sanjay.nm at samsung.com> changed:

           What    |Removed                     |Added
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 Attachment #302977|0                           |1
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--- Comment #12 from Sanjay NM <sanjay.nm at samsung.com> ---
Created attachment 303341
  --> https://bugzilla.gnome.org/attachment.cgi?id=303341&action=edit
videofilters: Added convolution based sharpen filter

Added support for Sharpening which is convolution based.
Currently it is implemented and tested for NV and RGB data
Below are the pipelines used for testing

gst-launch-1.0 filesrc location=pm.mp4 ! decodebin ! videoconvert ! sharpen !
videoconvert ! ximagesink
gst-launch-1.0 filesrc location=pm.mp4 ! decodebin ! videoconvert !
"video/x-raw, format={RGB}" ! sharpen ! videoconvert ! ximages

Fixed an issue in RGB format index calculation. 

Request to please review the patch

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