V4l2 Getting camera information

This program output camera driver, code stream format and other information
#include <stdio.h>#include<stdlib.h>//stdio.h and Stdlib.h is needed by perror function#include <sys/stat.h>#include<sys/types.h>#include<fcntl.h>//O_rdwr#include <unistd.h>#include<sys/mman.h>//Unistd.h and Sys/mman.h is needed by mmap function#include <stdbool.h>//false and True#include <sys/ioctl.h>#include<linux/videodev2.h>//v4l2 APIStatic intVideo_capability (intFD) {      intRET =0; /***********get the device capability********/      structv4l2_capability Cap; RET= IOCTL (FD, VIDIOC_QUERYCAP, &cap); if(Ret <0) {perror ("Vidioc_querycap failed"); returnret; } printf ("\n****capability informations****\n"); printf ("Driver:%s\n", Cap.driver); if(Cap.capabilities &v4l2_cap_video_capture) printf ("Capture capability is supported\n"); if(Cap.capabilities &v4l2_cap_streaming) printf ("streaming capability is supported\n"); if(Cap.capabilities &v4l2_cap_video_overlay) printf ("Overlay capability is supported\n"); return 0; } Static intVideo_fmtdesc (intFD) {      /***********format enumeration************/      intRET =0; structV4l2_fmtdesc fmtdes; //CLEAR (fmtdes); Fmtdes.index =0; Fmtdes.type=v4l2_buf_type_video_capture; printf ("\N**********VIDIOC Enumeration stream format informations:****\n");  while(1) {ret= IOCTL (FD, VIDIOC_ENUM_FMT, &fmtdes); if(Ret <0)                Break; printf ("{PixelFormat =%c%c%c%c, description =%s}\n", (Fmtdes.pixelformat&0xFF), (Fmtdes.pixelformat>>8) &0xFF, (Fmtdes.pixelformat>> -) &0xFF, (Fmtdes.pixelformat>> -) &0xFF, fmtdes.description); if(Fmtdes.type = =v4l2_buf_type_video_capture) printf ("Video Capture type:\n"); if(Fmtdes.pixelformat = =v4l2_pix_fmt_yuyv) printf ("v4l2_pix_fmt_yuyv\n"); if(Fmtdes.pixelformat = =v4l2_pix_fmt_yuv420) printf ("v4l2_pix_fmt_yuv420\n"); if(Fmtdes.pixelformat = =v4l2_pix_fmt_rgb24) printf ("v4l2_pix_fmt_rgb24\n"); if(Fmtdes.pixelformat = =v4l2_pix_fmt_yuv422p) printf ("v4l2_pix_fmt_yuv422p\n"); if(Fmtdes.pixelformat = =v4l2_pix_fmt_uyvy) printf ("v4l2_pix_fmt_uyvy\n"); Fmtdes.index++; }      return 0; }  voidMain () {intFD = open (Default_device, O_RDWR | O_nonblock,0);    Video_capability (FD);    Video_fmtdesc (FD); } 

The code should still be available, and you can't use it to tell me.

V4l2 as if the Ubuntu system comes with, if not the installation is also very convenient, like sudo apt-get install Libv4l-dev, Baidu a bit

V4l2 Getting camera information