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);
//Capture Loop
ioctl(fd,VIDIOCMCAPTURE, *video_mmap);
ioctl(fd,VIDIOCSYNC, &ONE);
<memcpy buffer 1>
ioctl(fd,VIDIOCMCAPTURE, *video_mmap);
ioctl(fd,VIDIOCSYNC, &TWO);
<memcpy buffer 2>
After each second I check the number of frames
I have been able to copy. Its always 8-10. If
anyone sees a problem, please let me know.
Thanks.
-kali
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