On Wed, 28 Aug 2002, Stephen Crampton wrote:
> I was getting around 4 fps with a Webcam 3 until I enabled compression
> through the driver.
>
> I'm using ioctl(VIDIOCGMBUF) and mmap to implement shared memory and then
> ioctl(VIDIOCMCAPTURE) and ioctl(VIDIOCMSYNC) to read frames. I use two
> frames in the following sequence:
Can you provide a little more detail on how to use mmap()? I have done the
actual mmap part but how do i use the buffers? Also - i am using v4l2 - is
it different from what you have specified below? Can i still do this?
> // initialize
> ioctl(VIDIOCMCAPTURE, frame0);
>
> while {
> ioctl(VIDIOCMCAPTURE, frame1);
> ioctl(VIDIOCMSYNC, frame0);
> ioctl(VIDIOCMCAPTURE, frame1);
> ioctl(VIDIOCMSYNC, frame0);
> }
Thanks
Brian
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