Kali Griffin wrote: > > Hi, > > I can only capture 8-10 fps regardless of image > size using the bttv drivers and the v4l interface. > > The type of card I have is an Osprey 100. The device > driver does not support read captures, so I have to > use mmap. Here is the gist of my code: > > fd = open(/dev/video0, O_RDONLY); > > video_picture.depth = 24; > video_picture.format = VIDEO_PALETTE_RGB24 > ioctl (fd, VIDIOCGPICT, *video_picture); > > video_window.width = 176; > video_window.height = 144; > ioctl (fd, VIDIOCSWIN, *video_window); > > //MMAP will only grant me enough memory for 2 frames > //no matter what my arguments are > unsigned char* data = > mmap(0, 152064,PROT_READ,MAP_SHARED,fd,0); Actually it won't, use GMBUF to get the correct parameters. > //Capture Loop Before the loop queue both buffers with CMCAPTURE. > ioctl(fd,VIDIOCSYNC, &ONE); > <memcpy buffer 1> > ioctl(fd,VIDIOCMCAPTURE, *video_mmap); > ioctl(fd,VIDIOCSYNC, &TWO); > <memcpy buffer 2> > ioctl(fd,VIDIOCMCAPTURE, *video_mmap); Should do the trick (but remeber to fix the frame value in video_mmap). -justin
