Haihao, could you, please, clarify API: does VAProcPipelineParameterBuffer::output_color_standard sets color format for the value in VAProcPipelineParameterBuffer::output_background_color or it sets something else?
As usual, we need to understand:
1) do we have required API in place (regardless whether driver supports such a trick or not)
2) do we have such support in the driver right now?
On 23 Dec 2016, at 20:01, Recker, Jon <***@intel.com<mailto:***@intel.com>> wrote:
Thank you for the information, Haihao. I have filed this feature request in bugzilla.
From: Xiang, Haihao
Sent: Friday, December 23, 2016 12:55 AM
To: Recker, Jon <***@intel.com<mailto:***@intel.com>>; ***@lists.freedesktop.org<mailto:***@lists.freedesktop.org>
Subject: Re: [Libva] Filling background pixels with YUV values
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.
> 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.
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