use dma_buf handle for hw video frames

[Nicolas Dufresne]

What is the question ?

Le 2015-01-12 01:24, Zhao, Halley a écrit :
>
> I have one idea to use dma_buf for hw video frames; in this way, video 
> codec and sink can be clearly separated, video codec is simplified as 
> well.
>
> Since dma_buf is Linux kernel concept, different hw codecs can share 
> the unique video sink.
>
See GstDMABufAllocator in gst-plugins-base.
>
> For additional explanation,
>
> We have a core codec library for VAAPI acceleration interface: 
> https://github.com/01org/libyami,
>
> it can export hw video frame as dma_buf handle, then renders it as 
> texture: 
> https://github.com/01org/libyami/blob/master/tests/decodeoutput.cpp#L465
>
> another example is: we added libyami wrapper to ffmpeg for h264 
> decoder, then an example player can use dma_buf for video rendering: 
> https://github.com/01org/player-ffmpeg-yami
>
If you want to experiment that (and if it improve the situation) feel 
free to propose some code.
>
> besides opengl context, dri3 protocol supports dma_buf as well, thus 
> legacy video rendering is fine as well.
>
Note that this is currently limited to 1 plane (1 FD) when combined with 
Mesa/DRM.

Nicolas
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