[Libva] H.264 decoder simple example

[Alexey]

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 <gb.devel at gmail.com>
wrote:

> Hi,
>
> 2014-08-14 7:06 GMT+02:00 Alexey <warpdest at gmail.com>:
>
> > 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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