下面是一个参考程序：
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#define WIDTH 320
#define HEIGHT 240
#define V4L_DEVICE "/dev/video0"
main()
{
unsigned char* buf;
int i,j;
int fd;
int re;
struct video_capability vcap;
struct video_channel vc;
struct video_mbuf mbuf;
struct video_mmap mm;
fd = open(V4L_DEVICE, O_RDWR);
if(fd<=0)
{
perror("open");
exit(1);
}
if(ioctl(fd, VIDIOCGCAP, &vcap)<0)
{
perror("VIDIOCGCAP");
exit(1);
}
fprintf(stderr,"Video Capture Device Name : %s\n",vcap.name);
for(i=0;i
vc.channel = i;
if(ioctl(fd, VIDIOCGCHAN, &vc)<0)
{
perror("VIDIOCGCHAN");
exit(1);
}
fprintf(stderr,"Video Source (%d) Name : %s\n",i, vc.name);
}
vc.channel =1;
vc.norm=1;
if(ioctl(fd, VIDIOCSCHAN, &vc) < 0)
{
perror("VIDIOCSCHAN");
exit(1);
}
if(ioctl(fd, VIDIOCGMBUF, &mbuf) < 0)
{
perror("VIDIOCGMBUF");
exit(1);
}
fprintf(stderr,"the frames number is %d\n",mbuf.frames);
buf = (unsigned char*)mmap(0, mbuf.size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
if((int)buf < 0)
{
perror("mmap");
exit(1);
}
mm.frame = 0;
mm.height = HEIGHT;
mm.width = WIDTH;
mm.format = VIDEO_PALETTE_RGB24;
if(ioctl(fd, VIDIOCMCAPTURE, &mm)<0)
{
perror("VIDIOCMCAPTURE");
exit(1);
}
if(ioctl(fd, VIDIOCSYNC, &mm.frame)<0)
{
perror("VIDIOCSYNC");
exit(1);
}
if(-1 == (write_jpeg("./pic001.jpeg",buf,75,WIDTH,HEIGHT,0)))
{
printf("write_jpeg error\n");
exit(1);
}
munmap(buf,mbuf.size);
close(fd);
}
里面的一些主要的结构，关于图片采集和摄像头属性的还是不太清楚，
还有就是我在做的时候还有一些ioctrl的参数老是提示错误，
所以图像采集总是出不来，希望大虾指点！感激不尽