[Libva] Filling background pixels with YUV values

[Xiang, Haihao]

Hi Jon,

VA-API doesn't support YUV background color. If you want to have this
feature, I suggest you file a bug with severity set to enhancement in
the bugzilla to track your requirement. We may consider to add this new
feature in a future version.

Thanks
Haihao

> Hello.
>  
> When composing several sources into a single output surface, we can
> specify the color of the background pixels using
> VAProcPipelineParameterBuffer::output_background_color. According to
> the documentation, this background color must be a 32-bit ARGB value.
>  
> But when the output is a non-RGB format (for example, NV12) it would
> be helpful if we could set the background color to a constant YUV
> value instead. Does libva provide any method to do this?
>  
> I have tried converting the desired YUV background color to RGB, then
> setting output_background_color to this RGB value. When the final
> picture is processed, the background color is converted back to YUV
> automatically. But the final background color does not necessarily
> match the requested value, for example when one of the RGB channels
> is clipped to fit in the range [0,255].
>  
> A workaround would be to create a separate full-size NV12 surface and
> fill it with the desired background color, but for performance
> reasons it is preferable to avoid this. Any suggestions would be very
> much appreciated. Thanks.
>  
> Jon
>  
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