linux查询video设备类型

想查询 dev/video的类型，找不到命令，闲的蛋疼留个模版

用的时候把video列表写进solve前的 dev_list即可

#include <stdio.h>#include <stdlib.h>#include <string.h>#include <assert.h>#include <fcntl.h>              /* low-level i/o */#include <unistd.h>#include <errno.h>#include <sys/stat.h>#include <sys/types.h>#include <sys/time.h>#include <sys/mman.h>#include <sys/ioctl.h>#include <asm/types.h>#include <linux/videodev2.h>int device_open(char *dev_name){    struct stat st;    if (-1 == stat(dev_name, &st))     {        fprintf(stderr, "Cannot identify '%s': %d, %s\n", dev_name, errno, strerror(errno));        // exit(EXIT_FAILURE);    }    if (!S_ISCHR(st.st_mode))     {        fprintf(stderr, "%s is no device\n", dev_name);        // exit(EXIT_FAILURE);    }    int fd = open(dev_name, O_RDWR /* required */ | O_NONBLOCK, 0);    if (-1 == fd)     {        fprintf(stderr, "Cannot open '%s': %d, %s\n", dev_name, errno, strerror(errno));        // exit(EXIT_FAILURE);    }    printf("%s %d : Open %s successfully. fd = %d\n", __func__, __LINE__, dev_name, fd);return fd;}int device_close(int fd){    if (-1 == close(fd))    {    printf("\tdevice close failed.\n");    // exit(EXIT_FAILURE);    }    else    {    printf("%s %d : devices close successfully\n", __func__, __LINE__);    }return 0;}int device_query(char *dev_name, int fd){struct v4l2_capability cap;memset(&cap, 0, sizeof(cap));    if (-1 == ioctl(fd, VIDIOC_QUERYCAP, &cap)) // query v4l2-devices's capability    {        if (EINVAL == errno)         {            fprintf(stderr, "%s is no V4L2 device\n", dev_name);            // exit(EXIT_FAILURE);        }         else         {        return 0;        printf("\tvideo ioctl_querycap failed.\n");            // exit(EXIT_FAILURE);        }}else//\tdevice name : %s\n    dev_name, {printf("\n\tdriver name : %s\n\tcard name : %s\n\tbus info : %s\n\tdriver version : %u.%u.%u\n\n",    cap.driver, cap.card, cap.bus_info,(cap.version >> 16) & 0XFF, (cap.version >> 8) & 0XFF, cap.version & 0XFF);}return 0;}int dev_num = 27;char dev_list[100][20] = {"/dev/video6","/dev/video7","/dev/video11","/dev/video12","/dev/video13", // 00 - 04"/dev/video14","/dev/video15","/dev/video16","/dev/video17","/dev/video18", // 05 - 09"/dev/video19","/dev/video23","/dev/video24","/dev/video25","/dev/video26", // 10 - 14"/dev/video27","/dev/video28","/dev/video29","/dev/video30","/dev/video31", // 15 - 19"/dev/video32","/dev/video33","/dev/video34","/dev/video36","/dev/video37", // 20 - 24"/dev/video38","/dev/video50"};int solve(){int i = 0;int dev_start = 0;int dev_end = dev_num;for( i = dev_start; i < dev_end; ++i){int fd = device_open(dev_list[i]);device_query(dev_list[i], fd);device_close(fd);}return 0;}int main(){printf("\nstart game\n");solve();printf("\nquit game\n");return 0;}

附 rp5410 video info

/*start gamedevice name :video6 driver name : MFCcard name : decoderbus info : driver version : 1.0.0device name :video7 driver name : MFCcard name : encoderbus info : driver version : 1.0.0device name :video11 driver name : s5p-jpegcard name : s5p-jpegbus info : driver version : 1.0.0device name :video12 driver name : s5p-jpegcard name : s5p-jpegbus info : driver version : 1.0.0device name :video13 driver name : exynos5-jpeg-hxcard name : exynos5-jpeg-hxbus info : driver version : 1.0.0device name :video14 driver name : exynos5-jpeg-hxcard name : exynos5-jpeg-hxbus info : driver version : 1.0.0device name :video16 driver name : s5p-mixercard name : mxr0_graph0bus info : 0driver version : 0.1.0device name :video17 driver name : s5p-mixercard name : mxr0_graph1bus info : 1driver version : 0.1.0device name :video18 driver name : s5p-mixercard name : mxr1_graph2bus info : 2driver version : 0.1.0device name :video19 driver name : s5p-mixercard name : mxr1_graph3bus info : 3driver version : 0.1.0device name :video23 driver name : exynos-gsccard name : exynos-gscbus info : driver version : 3.4.5device name :video24 driver name : exynos-gsccard name : exynos-gscbus info : driver version : 3.4.5device name :video26 driver name : exynos-gsccard name : exynos-gscbus info : driver version : 3.4.5device name :video27 driver name : exynos-gsccard name : exynos-gscbus info : driver version : 3.4.5device name :video29 driver name : exynos-gsccard name : exynos-gscbus info : driver version : 3.4.5device name :video30 driver name : exynos-gsccard name : exynos-gscbus info : driver version : 3.4.5device name :video32 driver name : exynos-gsccard name : exynos-gscbus info : driver version : 3.4.5device name :video33 driver name : exynos-gsccard name : exynos-gscbus info : driver version : 3.4.5device name :video50 driver name : exynos5-scalercard name : exynos5-scalerbus info : driver version : 3.4.5quit game*/