Hi, Big thanks Gwenole, http://gitorious.org/hwdecode-demos/hwdecode-demos/ very useful.
Best Regards, Warp. On Thu, Aug 14, 2014 at 9:20 AM, Gwenole Beauchesne <[email protected]> wrote: > Hi, > > 2014-08-14 7:06 GMT+02:00 Alexey <[email protected]>: > > > I try find simple example for decode h264 and fail. If someone have > please > > share. > > There are plenty of examples around. > > * hwdecode-demos, which shows off various ways to use HW decode > acceleration for a single frame: > <http://gitorious.org/hwdecode-demos/hwdecode-demos/> > > * gstreamer-vaapi, a set of GStreamer plug-ins: > <http://gitorious.org/vaapi/gstreamer-vaapi/ > > * FFmpeg/LibAV, another major multimedia framework on Linux: > <http://git.videolan.org/?p=ffmpeg.git;a=summary> > > Depending on your usages and constraints, I suggest you to use higher > level farmeworks as GStreamer or FFmpeg/LibAV to get this work done. > The reason behind this is that it's not a matter of submitting the > encoded elementary stream, you need additional work. So, in general, > it's just simpler to use higher level frameworks, unless you have > specific requirements. > > > And another question is its possible decode h264 stream and get back > > decoded YUV data to host? > > A typical way for that is to use vaGetImage() on the decoded VA > surface to copy the pixels back to host. You could also use > vaDeriveImage() and a copy function that takes care of improving > performance when downloading from Uncacheable Speculative Write > Combining (USWC) memory. > > The best example for that is VLC: > <http://git.videolan.org/?p=vlc.git;a=summary> (look for copy.[ch] > files, vaapi.[ch] files). > > Regards, > -- > Gwenole Beauchesne > Intel Corporation SAS / 2 rue de Paris, 92196 Meudon Cedex, France > Registration Number (RCS): Nanterre B 302 456 199 >
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