[FFmpeg-devel] Adding AMD OpenVideo Decode acceleration (original) (raw)

Leith Bade leith
Sun Jan 9 10:48:58 CET 2011

Thanks for that.

I copied the DXVA code and modified it to use OpenVideo Decode.

I now want to test it but I cannot figure out how you are supposed to use get/reget/release_buffer with hwaccel contexts from the application side.

Is there some existing open source application that uses FFmpeg's DXVA hwaccel so I can see how to do this?

One more question, if I didn't want ffmpeg to depend on the OVD library, what would be the best way to create a callback system in end_frame? (So the host application takes the filled buffers and calls OVD itself...)

Thanks, Leith Bade leith at leithalweapon.geek.nz

On 8 January 2011 09:21, Vitor Sessak wrote:

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

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