想查詢 dev/video的類型，找不到命令，閑的蛋疼留個模版

用的時候把video列表寫進solve前的 dev_list即可

#include

#include

#include

#include

#include /* low-level i/o */

#include

#include

#include

#include

#include

#include

#include

#include

#include

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 game

device name :video6

driver name : MFC

card name : decoder

bus info :

driver version : 1.0.0

device name :video7

driver name : MFC

card name : encoder

bus info :

driver version : 1.0.0

device name :video11

driver name : s5p-jpeg

card name : s5p-jpeg

bus info :

driver version : 1.0.0

device name :video12

driver name : s5p-jpeg

card name : s5p-jpeg

bus info :

driver version : 1.0.0

device name :video13

driver name : exynos5-jpeg-hx

card name : exynos5-jpeg-hx

bus info :

driver version : 1.0.0

device name :video14

driver name : exynos5-jpeg-hx

card name : exynos5-jpeg-hx

bus info :

driver version : 1.0.0

device name :video16

driver name : s5p-mixer

card name : mxr0_graph0

bus info : 0

driver version : 0.1.0

device name :video17

driver name : s5p-mixer

card name : mxr0_graph1

bus info : 1

driver version : 0.1.0

device name :video18

driver name : s5p-mixer

card name : mxr1_graph2

bus info : 2

driver version : 0.1.0

device name :video19

driver name : s5p-mixer

card name : mxr1_graph3

bus info : 3

driver version : 0.1.0

device name :video23

driver name : exynos-gsc

card name : exynos-gsc

bus info :

driver version : 3.4.5

device name :video24

driver name : exynos-gsc

card name : exynos-gsc

bus info :

driver version : 3.4.5

device name :video26

driver name : exynos-gsc

card name : exynos-gsc

bus info :

driver version : 3.4.5

device name :video27

driver name : exynos-gsc

card name : exynos-gsc

bus info :

driver version : 3.4.5

device name :video29

driver name : exynos-gsc

card name : exynos-gsc

bus info :

driver version : 3.4.5

device name :video30

driver name : exynos-gsc

card name : exynos-gsc

bus info :

driver version : 3.4.5

device name :video32

driver name : exynos-gsc

card name : exynos-gsc

bus info :

driver version : 3.4.5

device name :video33

driver name : exynos-gsc

card name : exynos-gsc

bus info :

driver version : 3.4.5

device name :video50

driver name : exynos5-scaler

card name : exynos5-scaler

bus info :

driver version : 3.4.5

quit game

*/

總結

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