On Wed, 6 Mar 2002, Chris Nuernberger wrote:
>
> > Not sure if this is what you want, but why not try: man v4l
>
> That is not what I want. I am compressing images, so I need access to that
> data for an arbitrary amount of time.
>
> I would like to capture to the same buffer that I pass in to xvideo with the
> call of XvShmPutImage.
>
> Basically, to set that all up, you have to get a shared memory segment (man
> shmget) then give it to X (XShmAttach, no man page on my system).
>
> I am trying to either get the bttv driver to use the linux shared memory
> (right now for streaming it uses mmap) system and give me an shmid that I can
It would have to lock those pages down and get a physical address.
mlock should lock them down, but I don't know how to get a physical
address.
> use and that xvideo can use, or figure out how I can get the shared memory
> system to just set the memory the capture device gave me from the mmap call
> as the shared memory it gives me an ID for.
>
That sounds easier, but both probably need kernel hacks.
Mark.
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