> Hi, > > I'm working on VAAPI support for libavg (www.libavg.de). Everything has gone > more-or-less smoothly and we have a working implementation that's been tested > using an NVidia GPU desktop and an AMD E350 Mini-PC, both with Ubuntu 12.04 > and stock drivers. Currently, we're using vaGetImage() and vaMapBuffer() to > retrieve the data and then upload it again as an OpenGL texture (yes, I know > this is the slowest way of doing things). > > However, on the E350, vaGetImage() blocks and seems to deliver images at the > video framerate (i.e. 25 fps in many cases). Is there a way to change this > behaviour or at least to determine whether an image is ready? We'd like our > compositor to run at full speed even if the video is updating more slowly. > The code in question is here: > https://www.libavg.de/site/projects/libavg/repository/entry/branches/libavg_vaapi/src/video/VAAPISurface.cpp, > lines 70ff. > > Thanks for any help! > > Cheers, > > Uli
You could use vaDeriveImage, which is much faster than vaGetImage. Or you could use the glx api of vaapi, which gives you an OpenGL texture directly.
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