VDPAU VdpOutputSurface and YCbCr

mINA87 · 05-30-10, 10:50 AM

Hello there,
I would like to ask if it's possible to fetch VdpOutputSurface pixel data in VDP_YCBCR_FORMAT_YV12 format, or in any other VDP_YCBCR_*. In other words - does the VdpVideoMixer has possibility to output YCbCr format or it just performs color space conversion and works on RGB then?
I would like to benefit from hardware decoding, deinterlacing, scaling and even overlaying using VDPAU and I would like to feed another codec with output from VDPAU. It accepts only YUV.
Of course I can perform RGB->YUV color space conversion on my own, but it would be nice if I could skip this step for higher performance of overall system.
Thanks and regards.

**Stephen Warren** · 06-01-10, 11:06 AM

mINA87, the VdpVideoMixer can only output to a VdpOutputSurface, which always contains RGB data.

With the recently added VDPAU <-> OpenGL/CUDA interop, you could still use the GPU to HW-accelerate de-interlacing, scaling, etc., but you'd have to write your own shader algorithms to do this.

05-30-10, 10:50 AM	#1
mINA87 Registered User Join Date: May 2010 Posts: 1	VDPAU VdpOutputSurface and YCbCr Hello there, I would like to ask if it's possible to fetch VdpOutputSurface pixel data in VDP_YCBCR_FORMAT_YV12 format, or in any other VDP_YCBCR_*. In other words - does the VdpVideoMixer has possibility to output YCbCr format or it just performs color space conversion and works on RGB then? I would like to benefit from hardware decoding, deinterlacing, scaling and even overlaying using VDPAU and I would like to feed another codec with output from VDPAU. It accepts only YUV. Of course I can perform RGB->YUV color space conversion on my own, but it would be nice if I could skip this step for higher performance of overall system. Thanks and regards.

06-01-10, 11:06 AM	#2
Stephen Warren Moderator Join Date: Aug 2005 Posts: 1,327	Re: VDPAU VdpOutputSurface and YCbCr mINA87, the VdpVideoMixer can only output to a VdpOutputSurface, which always contains RGB data. With the recently added VDPAU <-> OpenGL/CUDA interop, you could still use the GPU to HW-accelerate de-interlacing, scaling, etc., but you'd have to write your own shader algorithms to do this.