[FFmpeg-devel] Adding AMD OpenVideo Decode acceleration

[Vitor Sessak]

On 01/07/2011 02:26 PM, Leith Bade wrote:
> Hi
>
> I am new to FFmpeg.
>
> I would like to use FFmpeg to drive AMD's new OpenVideo Decode API (which
> interops with OpenCL and OpenGL) with H264.
>
> I have been learning the API, but the documentation is very poor (lots of
> typos, mistakes, vague or missing descriptions).
>
> As far as I can tell the API's structures are very similar to DXVA, but
> simplified a bit. (I have used DXVA docs to fill in the gaps in the OVD
> docs).
>
> I tried decoding only I-frames by using h264bistream library, but I am not
> very familiar with H264 and the spec is incredibly complex and hard to
> follow.
>
> I have not managed to get anything out of OVD except zero filled NV12
> buffers :-( (despite the API returning success code for the decode call).
>
> I read that FFmpeg has DXVA support now, and the H264 parser works
> correctly.
>
> How much effort would it be to add a custom hardware acceleration module for
> H264? I want it to interop with my OpenCL context, and output to a OpenCL
> memory buffer rather than a CPU memory buffer (like the default API does).
>
> What files should I look at?

Probably the best thing is to look at the commit who added DXVA to 
ffmpeg: 
http://lists.mplayerhq.hu/pipermail/ffmpeg-cvslog/2010-January/026854.html 
.

-Vitor