1.测试代码 读到摄象头参数 输出 video_test.c
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <linux/types.h> /* for videodev2.h */
#include <linux/videodev2.h>/* ./video_test </dev/video0> */int main(int argc, char **argv)
{int fd;struct v4l2_fmtdesc fmtdesc;struct v4l2_frmsizeenum fsenum;int fmt_index = 0;int frame_index = 0;if (argc != 2){printf("Usage: %s </dev/videoX>, print format detail for video device\n", argv[0]);return -1;}/* open */fd = open(argv[1], O_RDWR);if (fd < 0){printf("can not open %s\n", argv[1]);return -1;}while (1){/* 枚举格式 */fmtdesc.index = fmt_index; // 比如从0开始fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; // 指定type为"捕获"if (0 != ioctl(fd, VIDIOC_ENUM_FMT, &fmtdesc))break;frame_index = 0;while (1){/* 枚举这种格式所支持的帧大小 */memset(&fsenum, 0, sizeof(struct v4l2_frmsizeenum));fsenum.pixel_format = fmtdesc.pixelformat;fsenum.index = frame_index;if (ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &fsenum) == 0){printf("format %s,%d, framesize %d: %d x %d\n", fmtdesc.description, fmtdesc.pixelformat, frame_index, fsenum.discrete.width, fsenum.discrete.height);}else{break;}frame_index++;}fmt_index++;}return 0;
}
2. 交叉编译代码
arm-linux-gnueabi-gcc -o video_test video_test.c
3.测试
./video_test /dev/video0
