[MPlayer-users] mplayer VDPAU support

[kkumar s]

On Sun, Aug 30, 2009 at 2:05 PM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:

> kkumar s <kumars2007 <at> gmail.com> writes:
>
> > I am trying to understand the code for the data flow when vdpau is
> enabled.
> > I see that in libvo/vo_vdpau.c  the vdp_device is created , and later the
> > vdp_decoder is also
> > created.  I see a function draw_slice which actually calls
> > vdo_decoder_render.  I am not able to figure out how libavcodec calls
> > draw_slice
>
> put_image() in libmpcodecs/vf_vo.c calls draw_slice.
>
> > ,  and how the decoded video surface is displayed using X11
>
> In video_to_output_surface(), the VDPAU mixer gets the necessary data to be
> able
> to render a picture on an output_surface, flip_page (called from mplayer.c)
> displays it.
>
> These were MPlayer questions, for VDPAU questions please see
> /usr/include/vdpau.c,
> ftp://download.nvidia.com/XFree86/vdpau/doxygen/html/index.html or post a
> question on http://www.nvnews.net/vbulletin/forumdisplay.php?f=14 .
>
> Carl Eugen
>
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>





Hi,
   From my understanding , using mplayer with VDPAU , motion compensation is
offloaded  to the GPU,  so the vdpau should take care of
storing the reference frames.

If so why does the mplayer need to  call ff_vdpau_h264_set_reference_frames()
APIs,  does this store the decoded frame
for reference in CPU ?  Can you please explain what this function achieves ?

thanks,
kumar.