基于嵌入式LInux的人脸识别系统

#include <stdio.h> #include <stdlib.h> #include <string.h> #include <assert.h> #include <errno.h> #include <fcntl.h> #include <unistd.h> #include <malloc.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/time.h> #include <sys/mman.h> #include <sys/ioctl.h> #include "v4l2.h" #define CLEAR(x) memset (&x, 0, sizeof(x)) #define VIDEO_FORMAT V4L2_PIX_FMT_YUYV //V4L2_PIX_FMT_MJPEG //V4L2_PIX_FMT_JPEG //V4L2_PIX_FMT_YUYV //V4L2_PIX_FMT_YVU420 //V4L2_PIX_FMT_RGB32 FILE *file_fd; #define CAPTURE_FILE "test.jpg" char *mpeg[] = {"./1.jpg", "./2.jpg", "./3.jpg", "./4.jpg", "./5.jpg"}; int init_dev(pass_data *s) { //s->fd = open (s->dev_name, O_RDWR | O_NONBLOCK, 0); s->fd = open (s->dev_name, O_RDWR, 0); if(s->fd < 0) { printf("open %s failed\n",s->dev_name); exit(1); } struct v4l2_capability cap; if(ioctl (s->fd, VIDIOC_QUERYCAP, &cap) < 0) { printf("get vidieo capability error,error code: %d \n", errno); exit(1); } // Print capability infomations printf("\nCapability Informations:\n"); printf("Driver Name:%s\nCard Name:%s\nBus info:%s\nDriver Version:%u.%u.%u\nCapabilities: X\n", cap.driver,cap.card,cap.bus_info, (cap.version>>16)&0XFF, (cap.version>>8)&0XFF,cap.version&0XFF, cap.capabilities ); //获取设备支持的视频格式 struct v4l2_fmtdesc fmtdesc; CLEAR (fmtdesc); fmtdesc.index = 0; fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; printf("\nSupport format:\n"); while ((ioctl(s->fd, VIDIOC_ENUM_FMT, &fmtdesc)) == 0) { printf("/t%d.\n{\npixelformat = '%c%c%c%c',\ndescription = '%s'\n }\n", fmtdesc.index+1, fmtdesc.pixelformat & 0xFF, (fmtdesc.pixelformat >> 8) & 0xFF, (fmtdesc.pixelformat >> 16) & 0xFF, (fmtdesc.pixelformat >> 24) & 0xFF, fmtdesc.description); fmtdesc.index++; } if (!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) { fprintf (stderr, "%s is no video capture device\n", s->dev_name); exit (EXIT_FAILURE); } ///////////取景窗口缩放/有的摄像头不支持///////////////////////////////////////////////////////////////////////// //检查是否支持某种帧格式 struct v4l2_format fmt2; fmt2.type=V4L2_BUF_TYPE_VIDEO_CAPTURE; fmt2.fmt.pix.pixelformat = VIDEO_FORMAT; if(ioctl(s->fd,VIDIOC_TRY_FMT,&fmt2)==-1) if(errno==EINVAL) printf("not support format %s!\n",VIDEO_FORMAT); //设置视频捕获格式 /////////////////////////// ////////////////////////// struct v4l2_format fmt; CLEAR (fmt); fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; fmt.fmt.pix.width = 320; fmt.fmt.pix.height = 240; fmt.fmt.pix.field = V4L2_FIELD_INTERLACED; fmt.fmt.pix.pixelformat = VIDEO_FORMAT; //设置图像格式 if(ioctl (s->fd, VIDIOC_S_FMT, &fmt) < 0) { printf("failture VIDIOC_S_FMT\n"); exit(1); } /////////////////////////////////////////////////////////////////// /////////////////////////////////////////////////////////////////////// // 显示当前帧的相关信息 struct v4l2_format fmt3; fmt3.type=V4L2_BUF_TYPE_VIDEO_CAPTURE; ioctl(s->fd,VIDIOC_G_FMT,&fmt3); printf("\nCurrent data format information:\n twidth:%d\n theight:%d\n", fmt3.fmt.pix.width,fmt3.fmt.pix.height); struct v4l2_fmtdesc fmtdes; fmtdes.index=0; fmtdes.type=V4L2_BUF_TYPE_VIDEO_CAPTURE; while(ioctl(s->fd,VIDIOC_ENUM_FMT,&fmtdes)!=-1) { if(fmtdes.pixelformat & fmt3.fmt.pix.pixelformat) { printf(" tformat:%s\n",fmtdes.description); break; } fmtdes.index++; } /////////////////////////////////////////////////////////////////////// //视频分配捕获内存 struct v4l2_requestbuffers req; CLEAR (req); req.count = 5; req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; req.memory = V4L2_MEMORY_MMAP; //申请缓冲，count是申请的数量 if(ioctl (s->fd, VIDIOC_REQBUFS, &req) < 0) { printf("failture VIDIOC_REQBUFS\n"); exit(1); } if (req.count < 2) printf("Insufficient buffer memory\n"); //内存中建立对应空间 //获取缓冲帧的地址、长度 //s->buffers = calloc (req.count, sizeof (*s->buffers));//在内存的动态存储区中分配n个长度为size的连续空间，函数返回一个指向分配起始地址的指针 s->buffers = (buffer *)calloc (req.count, sizeof (*s->buffers)); if (!s->buffers) { fprintf (stderr, "Out of memory/n"); exit (EXIT_FAILURE); } for (s->n_buffers = 0; s->n_buffers < req.count; ++s->n_buffers) { struct v4l2_buffer buf; //驱动中的一帧 CLEAR (buf); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = s->n_buffers;// 要获取内核视频缓冲区的信息编号 if (-1 == ioctl (s->fd, VIDIOC_QUERYBUF, &buf)) //映射用户空间 { printf ("VIDIOC_QUERYBUF error\n"); exit(-1); } s->buffers[s->n_buffers].length = buf.length; fprintf (stderr, "%d---------------/n",s->buffers[s->n_buffers].length); // 把内核空间缓冲区映射到用户空间缓冲区 s->buffers[s->n_buffers].start = mmap (NULL , //通过mmap建立映射关系 buf.length, PROT_READ | PROT_WRITE , MAP_SHARED , s->fd, buf.m.offset); if (MAP_FAILED == s->buffers[s->n_buffers].start) { printf ("mmap failed\n"); exit(1); } } //投放一个空的视频缓冲区到视频缓冲区输入队列中 //把四个缓冲帧放入队列，并启动数据流 unsigned int i; // 将缓冲帧放入队列 enum v4l2_buf_type type; for (i = 0; i < s->n_buffers; ++i) { struct v4l2_buffer buf; CLEAR (buf); buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; buf.memory = V4L2_MEMORY_MMAP; buf.index = i; //指定要投放到视频输入队列中的内核空间视频缓冲区的编号; if (-1 == ioctl (s->fd, VIDIOC_QBUF, &buf))//申请到的缓冲进入列队 printf ("VIDIOC_QBUF failed\n"); } //开始捕捉图像数据 type = V4L2_BUF_TYPE_VIDEO_CAPTURE; if (-1 == ioctl (s->fd, VIDIOC_STREAMON, &type)) { printf ("VIDIOC_S