So all I need is simple - a list of currently avaliable video capture devices (web cameras). I need it in simple C or C++ console app. By list I mean something like such console output:
1) Asus Web Camera
2) Sony Web Camera
So It seems simple but I have one requirement - use of native OS apis as much as possible - no external libs - after all - all we want is to print out a a list - not to fly onto the moon!)
How to do such thing?
also from this series:
This is a code snippet I had laying around. Probably from a book. I guess you could just iterate over all /dev/videoN nodes and get the info.
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <linux/videodev.h>
int main(){
int fd;
struct video_capability video_cap;
struct video_window video_win;
struct video_picture video_pic;
if((fd = open("/dev/video0", O_RDONLY)) == -1){
perror("cam_info: Can't open device");
return 1;
}
if(ioctl(fd, VIDIOCGCAP, &video_cap) == -1)
perror("cam_info: Can't get capabilities");
else {
printf("Name:\t\t '%s'\n", video_cap.name);
printf("Minimum size:\t%d x %d\n", video_cap.minwidth, video_cap.minheight);
printf("Maximum size:\t%d x %d\n", video_cap.maxwidth, video_cap.maxheight);
}
if(ioctl(fd, VIDIOCGWIN, &video_win) == -1)
perror("cam_info: Can't get window information");
else
printf("Current size:\t%d x %d\n", video_win.width, video_win.height);
if(ioctl(fd, VIDIOCGPICT, &video_pic) == -1)
perror("cam_info: Can't get picture information");
else
printf("Current depth:\t%d\n", video_pic.depth);
close(fd);
return 0;
}