[Libva] Encode from texture source?

[Pawel Osciak]

Hi,
Is there any way to do a zero-copy encode/video processing from a texture
source? This would I guess involve turning a texture/X drawable into a
VASurface? I think Gwenole mentioned some extensions he's been working on
back in April 2012, but I haven't found any of this in the code or
examples...
Thanks,
Pawel
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