[Libva] [PATCH][G45][07/10] Add NV12 image format

[Gwenole Beauchesne]

Hi,

This patch adds NV12 image format. This is the native surface format  
for H.264 decoding. Tested with VLC.

Note: it should be possible to write an NV12->I420 shader program for  
non H.264 surfaces, but I don't know how. :) So, I am currently  
returning an error if the source surface is not used for H.264 decoding.

Regards,
Gwenole.

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