[gst-devel] How to fit in a GPU accelerated rendering plugin

[Vinay Reddy]

On Dec 27, 2007 11:14 AM, Andy Wingo <wingo at pobox.com> wrote:
> Hi Wladimir,
>
> On Fri 14 Dec 2007 11:45, "Wladimir van der Laan" <laanwj at gmail.com> writes:
>
> > Hello,
> >
> > I have created a GPU-accelerated plugin to playback Dirac video
> > streams.
>
> Rocking!
>
> > Is there infrastructure in place to pass the output of a plugin as a
> > GL texture, for direct rendering? Or some other recommended way to do
> > this?
>
> Since no one else mentioned this in this thread IIRC, David Schleef has
> been doing things like this, check his weblog:
>
>   http://www.schleef.org/blog/2007/12/25/opengl-in-gstreamer/
>
> Eventually when glimagesink gets updated there will be no need for
> gldownload, the texture can be rendered directly.
>
> > I realize I've probably written the first video rendering plugin for
> > Linux that is accelerated on graphics hardware, so this might get
> > interesting.
>
> There have been GPU-based filters before, and direct-path hardware
> decoders, but not decoders on the GPU I don't think. You rock :-)

In case of direct rendering (decoding and display, both being done
from the GPU), how does video clipping work? As in, how does the GPU
know what portion of the video to display on-screen? Is the overlay
color used as a mask or does someone maintain a list of clipping
rectangles?

Thanks,
Vinay