On Wed, 2013-10-30 at 02:02 -0600, Zou, Nanhai wrote: > In the previous versions of libva intel-driver, video post processing > features are mostly developed by GEN assembly. > > Those assembly are extremely hard to write/debug and understand, could > not be reused across different GEN platform. > > This limited developers to develop their video processing algorithm > over libva. > > > > Now we have setup an experimental branch in libva to use OpenCL as the > video post processing language. > > This branch can share video buffer with beignet driver as bo, then > call OpenCL to process the video buffer as an image object. > > So that people develop high performance VPP with high level language > on GPU with zero copy. (in current stage, beignet only support > HD4000). > > > > For those who are interested in develop their own VPP algorithm, you > may try it and give feedback to us. > > We have put 4 example post processing kernels in that branch. > > > > 1. Make and Install Beignet from > git://anongit.freedesktop.org/beignet with opencl-1.2 branch. > > 2. Install ocl-icd driver > > 3 Make and Install libva driver and libva intel-driver from > > git://people.freedesktop.org/~yakuiz/libva > > git://people.freedesktop.org/~yakuiz/intel-driver > > Please add --enable-opencl when configuring libva intel-driver.
It is noted that the cl_branch should be used for libva/intel-driver. The intel-driver also includes the README that describes how to use the OpenCL for the video post-processing. > > > > export INTEL_OCL="gray" to specify which opencl kernel to use. > > We have put 4 sample opencl kernels in the branch, "gray", "blur", > "mirror" and "pixelated". > > > > Use a vaapi enabled mplayer to playback a video. > > mplayer -vo vaapi:scaling=fast -va vaapi <your-mp4-video-file> > > > > Then you will see the post processing effect. > > > > TODOs. > > Extend the API to a more flexible version, so that OpenCL can handle > more than 1 reference buffer or used in other video processing > function. > > E.g. video-encoding processing and camera pipeline. > > > > Expose more ways to access video buffer, to access video buffer as raw > data or with other pixel format. > > Expose the hardware media sampler function to OCL as built-in. > > > > Thanks > > Zou Nanhai > > > > > _______________________________________________ Libva mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/libva
