On Wed, 16 Nov 2005, Smoof . wrote:
> >On Wed, 16 Nov 2005, Alex Deucher wrote:
> >
> > > On 11/16/05, Smoof . <[EMAIL PROTECTED]> wrote:
> > > > Hello,
> > > >
> > > > I am writing an application that will display up to 9 independent
> >video
> > > > streams (each stream is 320 x 240). I'm new to Xv and may not be
> >using the
> > > > correct terminology so please bear with me. I have tried two
> >approaches:
> > > >
> > > > The first approach was to create one large overlay using
> >XvShmCreateImage
> > > > and tile in the video frames. Once all frames are tiled in, use
> > > > XvShmPutImage to send them to the X server. This method works
> >perfectly.
> > > > However, my ultimate goal is to send each video stream to it's own GTK
> > > > widget so I can have each video stream playing in a window that can be
> > > > moved, be surrounded by buttons, minimized, etc...
> > > >
> > > > I implemented this by creating a simple GTK app with three drawing
> >areas
> > > > (ultimately I will have 9) of 320x240 and used some GDK functions to
> > > > determine the X window id's for the widgets. I created a separate
> >overlay
> > > > (again using XvShmCreateImage) for each window. Then I call
> >XvShmPutImage
> > > > once for each window. Finally I call XFlush so send the requests to
> >the X
> > > > server. I tried using XSync but it seemed to interfere with the GTK
> >event
> > > > loop.
> > > >
> > > > The problem with this second approach is that the overlays are
> >flashing blue
> > > > (the overlay color key from what I've read). So I looking for advice
> >on how
> > > > to update multiple overlays at a rate of 24fps without any flashing.
> >Or if
> > > > you don't think this is possible then please let me know and I'll just
> >have
> > > > to get by with my first implementation.
> > > >
> > >
> > > Most hardware only has one overlay so each widget will be fighting for
> > > it. only the one that has it at any given moment will actually
> > > display the video; the rest will show the colorkey.
> > >
> > > Alex
> >
> > Typically, a client will grab the Xv port when using it to prevent
> >other clients from being able to use the same Xv port. When a new
> >client can't grab one Xv port, it looks for another one. That mechanism
> >only works when there are different clients. If you want to do all
> >rendering from the same client, then you need to deliberately use
> >different ports for each Window. Some drivers export more than one
> >adaptor that supports XvImages and some adaptors have more than one
> >port. Overlay adaptors will typically only have a single port.
> >Run xvinfo for a summary of adaptors and their capabilities.
> >
> >
> > Mark.
>
> My plan was to do all the rendering with the same client and I know that my
> overlay adaptor only has a single port for the YUV420 format that I am
> using.
Do you have non-overlay XvImage adaptors with more than one port?
NVIDIA drivers and some others offer this.
Mark.
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