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ת×Ô£ºhttp://blog.chinaunix.net/u/7547/showart_122619.html
1.open device:
      video_dev = open("\dev\video0",O_RDWR));
2.get the information of the video device
    struct video_capability video_cap;
    memset(&video_cap,0,sizeof(video_cap));
    if(ioctl(video_dev,VIDIOCGCAP,&video_cap) == -1)
    {
        perror("Cann't get the information of the video device");
        close(video_dev);
        exit(1);
    }
3.get the information of the channels
    struct video_channel video_chan;
    memset(&video_chan,0,sizeof(video_chan));
    for(channel = 0;channel < video_cap.channels;channel++)
    {
        video_chan.channel = channel;
        if(ioctl(video_dev,VIDIOCGCHAN,&video_chan) == -1)
        {
            perror("Cann't get the information of the channels");
            close(video_dev);
            exit(3);
        }
        if(video_chan.type == VIDEO_TYPE_TV)
        {
                  #ifdef DEBUG
            printf("NO.%d channel is %s,type is tv!\n",channel,video_chan.name);
                  #endif
        }
        if(video_chan.type == VIDEO_TYPE_CAMERA)