[vlc-devel] [PATCH] DxVA2: allow NV12 pixel format all the way to the D3D texture
remi at remlab.net
Wed Apr 1 14:28:41 CEST 2015
Le 2015-04-01 14:19, Steve Lhomme a écrit :
> Do not force YV12 out of DxVA using the costly SplitPlanes as NV12 is
> preferred format and will always comes with DxVA and the renderers
With the current architecture, the decoder cannot know what is
downstream. You cannot assume that it is the Direct3D 11 video output.
It could be a filter (as JB already noted), it could be another video
output, it could be video splitter or it could even be an encoder (in
> "NV12 is the preferred 4:2:0 pixel format for DirectX VA. It is
> expected to be an intermediate-term requirement for DirectX VA
> accelerators supporting 4:2:0 video."
I think the preferred texture format for any reasonable video
acceleration is "opaque". If you want to optimize the data path from the
DX VA decoder to the DX 3D video output, you should not copy the data
back to CPU memory at all. The issue of NV12 vs YV12 is thus moot.
(And any modern video DSP or GPU will prefer a vendor-specific tiled
texture format over NV12.)
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