[Libva] [PATCH] Add VA_STATUS_ERROR_UNIMPLEMENTED

[Gwenole Beauchesne]

Hi,

It's generally desirable to know if VA driver failed for a specific 
function because it indeed failed (VA_STATUS_ERROR_OPERATION_FAILED) or it 
was not implemented.

That way, a program can take appropriate action if a function is not 
implemented. e.g. use plain vaGetImage() instead of vaDeriveImage(). Or 
don't issue a fatal error if Subpictures are not implemented yet.

Thanks,
Gwenole.
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