如何获得视频捕获设备（网络摄像头）在Linux（Ubuntu的）名单？ （C / C ++） [英] How to get a list of video capture devices (web cameras) on linux ( ubuntu )? (C/C++)

问题描述

所以，我需要的是简单的 - 目前avaliable视频捕获设备（网络摄像头）的列表。我需要它在简单的C或C ++控制台应用程序。通过列表我的意思是像这样的控制台输出：

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

所以它似乎很简单，但我有一个要求 - 利用原生操作系统的API尽可能 - 无需外部库 - 毕竟 - 我们想要的是打印出AA列表 - ！不飞至月球）

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!)

如何做这种事？

也是从这个系列：

• How获得视频捕获设备的列表上的Linux？和<一个href=\"http://stackoverflow.com/questions/4483366/how-to-get-a-list-video-capture-devices-names-web-cameras-on-linux-ubuntu\">special在得到相机名称的详细信息，提供正确，测试的答案


• How获得在Mac OS的视频采集设备的列表？用正确的的，还没有被我的答案，测试


• How获得视频捕获设备的列表上的窗口？用正确的的，测试的答案


• How获得使用Qt（跨平台）列表中的视频采集设备的名字呢？

• How to get a list of video capture devices on linux? and special details on getting cameras NAMES with correct, tested answers
• How to get a list of video capture devices on Mac OS? with correct, not yet tested by my answers
• How to get a list of video capture devices on windows? with correct, tested answers
• How to get a list video capture devices NAMES using Qt (crossplatform)?

推荐答案

这是一个code段我周围铺设。也许从一本书。我猜你可能只是遍历所有的/ dev / videoN节点并获得信息。

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;
}

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