[Libva] [PATCH intel-driver] dri: return error for unimplemented subsampling types

[Scott D Phillips]

On Thu, Jul 21, 2016 at 10:46:06PM -0700, Xiang, Haihao wrote:
> 
> > Previously YUV422 surfaces were allowed to be rendered but got
> > rendered improperly.
> 
> YUV422 (planar) surface works for me, but packed surface is not
> supported.

Ah, you're right. I wasn't able to get it work initially with my
gstreamer-vaapi based test, but that's because vaPutImage is
unimplemented for 422H. I've sent a patch that checks fourcc
instead of subsampling type.