linux -- camera shot 拍照功能

#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
#include <sys/mman.h>
#include <assert.h>
#include <linux/videodev2.h>
#include <linux/fb.h>
#include <pthread.h>
//照相机延时等待
#define TimeOut 5
//拍照个数
#define CapNum 10
//设置照片宽度高度
#define CapWidth 320
#define CapHeight 240
//申请Buf个数
#define ReqButNum 4
//使用前置或者后置Camera 前置设0，后置设1
#define IsRearCamera 0
//设置帧率
#define FPS 10
//设置格式
#define PIXELFMT V4L2_PIX_FMT_YUYV
#define CapDelay 100*1000
#define CLEAR(x) memset(&(x), 0, sizeof(x))
typedef unsigned char BYTE;
typedef unsigned short WORD;
typedef unsigned int DWORD;
typedef long LONG;
typedef struct
{
void *start;
int length;
}BUFTYPE;
struct tsp_event {
struct timeval time;
unsigned short type;
unsigned short code;
unsigned int value;
};
typedef struct tagBITMAPFILEHEADER {
WORD bfType;
DWORD bfSize;
WORD bfReserved1;
WORD bfReserved2;
DWORD bfOffBits;
}__attribute__((packed)) BITMAPFILEHEADER, *PBITMAPFILEHEADER;
typedef struct tagBITMAPINFOHEADER {
DWORD biSize;
LONG biWidth;
LONG biHeight;
WORD biPlanes;
WORD biBitCount;
DWORD biCompression;
DWORD biSizeImage;
LONG biXPelsPerMeter;
LONG biYPelsPerMeter;
DWORD biClrUsed;
DWORD biClrImportant;
}__attribute__((packed)) BITMAPINFOHEADER, *PBITMAPINFOHEADER;
static BITMAPFILEHEADER file_head;
static BITMAPINFOHEADER info_head;
typedef struct tagRGBQUAD {
BYTE rgbBlue;
BYTE rgbGreen;
BYTE rgbRed;
BYTE rgbReserved;
}__attribute__((packed)) RGBQUAD;
BUFTYPE *user_buf;
static int n_buffer = 0;
static struct fb_var_screeninfo vinfo;
static struct fb_fix_screeninfo finfo;
static int lcd_buf_size;
static char *fb_buf = NULL;
static int tsp_fd;
static pthread_t capture_tid;
int display_x = 0;
int display_y = 0;
int save_image()
{
FILE *fp;
static int num = 0;
char picture_name[40]={'\0'};
char *addr = (char *)fb_buf;
int length = CapWidth * CapHeight * vinfo.bits_per_pixel / 8;
int fd;
int data_size;
int i,j,k;
char *tmp_buf;
tmp_buf = (char *)malloc(length);
if(tmp_buf == NULL)
{
printf("tmp_buf alloc fail\n");
exit(EXIT_FAILURE);
}
if(access("/udisk/camtest",0)!=0)
{
mkdir("/udisk/camtest", 0777);
}
sprintf(picture_name,"/udisk/camtest/picture%d.bmp",num ++);
printf("write image to sdcard:name:%s\n",picture_name);
data_size = length;
file_head.bfType = 0x4d42;
file_head.bfSize = sizeof(file_head) + sizeof(info_head) + data_size;
file_head.bfReserved1 = file_head.bfReserved2 = 0;
file_head.bfOffBits = sizeof(file_head) + sizeof(info_head);
info_head.biSize = sizeof(info_head);
info_head.biWidth = CapWidth;
info_head.biHeight = CapHeight;
info_head.biPlanes = 1;
info_head.biBitCount = 32;
info_head.biCompression = 0;
info_head.biSizeImage = 0;
info_head.biXPelsPerMeter = 0;
info_head.biYPelsPerMeter = 0;
info_head.biClrUsed = 0;
info_head.biClrImportant = 0;
fd = open(picture_name, O_RDWR | O_CREAT, 0644);
if(fd < 0)
{
perror("create image error\n");
close (fd);
exit(EXIT_FAILURE);
}
write(fd, &file_head, sizeof(file_head));
write(fd, &info_head, sizeof(info_head));
int bmpLineLenth = CapWidth * vinfo.bits_per_pixel / 8;
for(i = 0; i < length; i++)
{
tmp_buf[i] = fb_buf[(CapHeight - i/bmpLineLenth - 1) * finfo.line_length + i%bmpLineLenth];
}
for(i = 0; i < length; i++)
{
fb_buf[(i/bmpLineLenth) * finfo.line_length + i%bmpLineLenth + bmpLineLenth] = tmp_buf[i] ;
}
write(fd, tmp_buf, length);
usleep(500);
close(fd);
return 0;
}
static void *capture_thread(void *pVoid)
{
int ret;
int key_change = 0;
struct tsp_event tsp_value;
#define BTN_TOUCH 0x14a
while(1)
{
printf("capture_thread\n");
ret = read(tsp_fd, &tsp_value, sizeof(struct tsp_event)); /* 如果无数据则休眠 */
if (ret < 0)
{
printf("fail to read\n");
return;
}
//如果触摸释放掉，则开始保存图片
if((tsp_value.code == BTN_TOUCH) && (tsp_value.value == 0))
save_image();
printf("code:%04d,value:%04d\n",tsp_value.code, tsp_value.value);
}
}
//打开摄像头设备
int open_camer_device()
{
int fd;
//非阻塞方式打开，如果打开错误，会立即返回
if((fd = open("/dev/video0",O_RDWR | O_NONBLOCK)) < 0)
{
perror("Fail to open");
exit(EXIT_FAILURE);
}
printf("open cam success %d\n",fd);
return fd;
}
//打开摄像头设备
int open_lcd_device()
{
int fd;
//非阻塞方式打开，如果打开错误，会立即返回
if((fd = open("/dev/fb0",O_RDWR | O_NONBLOCK)) < 0)
{
perror("Fail to open");
exit(EXIT_FAILURE);
}
printf("open lcd success %d\n",fd);
return fd;
}
//申请Camera Buf，并映射到用户空间，利用全局变量user_buf保存映射信息
int init_mmap(int lcd_fd, int cam_fd)
{
int i = 0;
int err;
int ret;
struct v4l2_control ctrl;
struct v4l2_requestbuffers reqbuf;
//mmap framebuffer
fb_buf = (char *)mmap(
NULL,
lcd_buf_size,
PROT_READ | PROT_WRITE,MAP_SHARED ,
lcd_fd,
0);
if(NULL == fb_buf)
{
perror("Fail to mmap fb_buf");
exit(EXIT_FAILURE);
}
bzero(&reqbuf,sizeof(reqbuf));
reqbuf.count = ReqButNum;
reqbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
reqbuf.memory = V4L2_MEMORY_MMAP;
printf("start VIDIOC_REQBUFS\n");
//申请视频缓冲区(这个缓冲区位于内核空间，需要通过mmap映射)
//这一步操作可能会修改reqbuf.count的值，修改为实际成功申请缓冲区个数
if(-1 == ioctl(cam_fd,VIDIOC_REQBUFS,&reqbuf))
{
perror("Fail to ioctl 'VIDIOC_REQBUFS'");
exit(EXIT_FAILURE);
}
n_buffer = reqbuf.count;
user_buf = calloc(reqbuf.count,sizeof(*user_buf));
if(user_buf == NULL){
fprintf(stderr,"Out of memory\n");
exit(EXIT_FAILURE);
}
//将内核缓冲区映射到用户进程空间
for(i = 0; i < reqbuf.count; i ++)
{
struct v4l2_buffer buf;
bzero(&buf,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
//查询申请到内核缓冲区的信息
if(-1 == ioctl(cam_fd,VIDIOC_QUERYBUF,&buf))
{
perror("Fail to ioctl : VIDIOC_QUERYBUF");
exit(EXIT_FAILURE);
}
user_buf[i].length = buf.length;
user_buf[i].start =
mmap(
NULL,/*start anywhere*/
buf.length,
PROT_READ | PROT_WRITE,
MAP_SHARED,
cam_fd,buf.m.offset
);
if(MAP_FAILED == user_buf[i].start)
{
perror("Fail to mmap\n");
printf("%d\n",i);
exit(EXIT_FAILURE);
}
// printf("start:08%lx\n",user_buf[i].start);
}
return 0;
}
//初始化视频设备
int init_device(int lcd_fd, int cam_fd)
{
struct v4l2_fmtdesc fmt;
struct v4l2_capability cap;
struct v4l2_format stream_fmt;
struct v4l2_input input;
struct v4l2_control ctrl;
struct v4l2_streamparm stream;
int err;
int ret;
if(-1 == ioctl(lcd_fd,FBIOGET_FSCREENINFO,&finfo))
{
perror("Fail to ioctl:FBIOGET_FSCREENINFO\n");
exit(EXIT_FAILURE);
}
if (-1==ioctl(lcd_fd, FBIOGET_VSCREENINFO, &vinfo))
{
perror("Fail to ioctl:FBIOGET_VSCREENINFO\n");
exit(EXIT_FAILURE);
}
lcd_buf_size = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
printf("vinfo.xres:%d, vinfo.yres:%d, vinfo.bits_per_pixel:%d, lcd_buf_size:%d, finfo.line_length:%d\n",vinfo.xres, vinfo.yres, vinfo.bits_per_pixel, lcd_buf_size, finfo.line_length);
memset(&fmt,0,sizeof(fmt));
fmt.index = 0;
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
//枚举视频设置支持的格式
while((ret = ioctl(cam_fd,VIDIOC_ENUM_FMT,&fmt)) == 0)
{
fmt.index ++ ;
printf("{pixelformat = %c%c%c%c},description = '%s'\n",
fmt.pixelformat & 0xff,(fmt.pixelformat >> 8)&0xff,
(fmt.pixelformat >> 16) & 0xff,(fmt.pixelformat >> 24)&0xff,
fmt.description);
}
//查询视频设备支持的功能
ret = ioctl(cam_fd,VIDIOC_QUERYCAP,&cap);
if(ret < 0){
perror("FAIL to ioctl VIDIOC_QUERYCAP");
exit(EXIT_FAILURE);
}
if(!(cap.capabilities & V4L2_CAP_VIDEO_CAPTURE))
{
printf("The Current device is not a video capture device\n");
exit(EXIT_FAILURE);
}
if(!(cap.capabilities & V4L2_CAP_STREAMING))
{
printf("The Current device does not support streaming i/o\n");
exit(EXIT_FAILURE);
}
CLEAR(stream_fmt);
//设置摄像头采集数据格式，如设置采集数据的
//长,宽，图像格式(JPEG,YUYV,MJPEG等格式)
stream_fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
stream_fmt.fmt.pix.width = CapWidth;
stream_fmt.fmt.pix.height = CapHeight;
stream_fmt.fmt.pix.pixelformat = PIXELFMT;
stream_fmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
if(-1 == ioctl(cam_fd,VIDIOC_S_FMT,&stream_fmt))
{
printf("Can't set the fmt\n");
perror("Fail to ioctl\n");
exit(EXIT_FAILURE);
}
printf("VIDIOC_S_FMT successfully\n");
init_mmap(lcd_fd, cam_fd);
//通过S_PARM来设置FPS
/* fimc_v4l2_s_parm */
CLEAR(stream);
stream.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
stream.parm.capture.capturemode = 0;
stream.parm.capture.timeperframe.numerator = 1;
stream.parm.capture.timeperframe.denominator = FPS;
err = ioctl(cam_fd, VIDIOC_S_PARM, &stream);
if(err < 0)
printf("FimcV4l2 start: error %d, VIDIOC_S_PARM", err);
return 0;
}
int start_capturing(int cam_fd)
{
unsigned int i;
enum v4l2_buf_type type;
//将申请的内核缓冲区放入一个队列中
for(i = 0;i < n_buffer;i ++)
{
struct v4l2_buffer buf;
bzero(&buf,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
if(-1 == ioctl(cam_fd,VIDIOC_QBUF,&buf))
{
perror("Fail to ioctl 'VIDIOC_QBUF'");
exit(EXIT_FAILURE);
}
}
//开始采集数据
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if(-1 == ioctl(cam_fd,VIDIOC_STREAMON,&type))
{
printf("i = %d.\n",i);
perror("Fail to ioctl 'VIDIOC_STREAMON'");
exit(EXIT_FAILURE);
}
return 0;
}
inline int clip(int value, int min, int max)
{
return (value > max ? max : value < min ? min : value);
}
//将采集好的数据放到文件中
int process_image(void *addr,int length)
{
unsigned char* in=(char*)addr;
int width=CapWidth;
int height=CapHeight;
int istride=CapWidth *2;
int x,y,j;
int y0,u,y1,v,r,g,b;
long location=0;
//printf("vinfo.xoffset:%d,vinfo.yoffset:%d\n",vinfo.xoffset,vinfo.yoffset);
for ( y = 0; y < height; ++y)
{
for (j = 0, x=0; j < width * 2 ; j += 4,x +=2)
{
location = (x+display_x) * (vinfo.bits_per_pixel/8) + (y+display_y) * finfo.line_length;
y0 = in[j];
u = in[j + 1] - 128;
y1 = in[j + 2];
v = in[j + 3] - 128;
r = (298 * y0 + 409 * v + 128) >> 8;
g = (298 * y0 - 100 * u - 208 * v + 128) >> 8;
b = (298 * y0 + 516 * u + 128) >> 8;
fb_buf[ location + 0] = clip(b, 0, 255);
fb_buf[ location + 1] = clip(g, 0, 255);
fb_buf[ location + 2] = clip(r, 0, 255);
fb_buf[ location + 3] = 255;
r = (298 * y1 + 409 * v + 128) >> 8;
g = (298 * y1 - 100 * u - 208 * v + 128) >> 8;
b = (298 * y1 + 516 * u + 128) >> 8;
fb_buf[ location + 4] = clip(b, 0, 255);
fb_buf[ location + 5] = clip(g, 0, 255);
fb_buf[ location + 6] = clip(r, 0, 255);
fb_buf[ location + 7] = 255;
} in +=istride; }
// usleep(500);
return 0;
}
int read_frame(int cam_fd)
{
struct v4l2_buffer buf;
unsigned int i;
bzero(&buf,sizeof(buf));
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
//从Camera buf中把数据拿出来
if(-1 == ioctl(cam_fd,VIDIOC_DQBUF,&buf))
{
perror("Fail to ioctl 'VIDIOC_DQBUF'");
exit(EXIT_FAILURE);
}
assert(buf.index < n_buffer);
process_image(user_buf[buf.index].start,user_buf[buf.index].length);
//把处理过的Buf 重新入队
if(-1 == ioctl(cam_fd,VIDIOC_QBUF,&buf))
{
perror("Fail to ioctl 'VIDIOC_QBUF'");
exit(EXIT_FAILURE);
}
return 1;
}
//利用select 进行超时处理
int mainloop(int cam_fd)
{
int count = 1;//CapNum;
clock_t startTime, finishTime;
double selectTime, frameTime;
while(count++ > 0)
{
for(;;)
{
fd_set fds;
struct timeval tv;
int r;
// startTime = clock();
FD_ZERO(&fds);
FD_SET(cam_fd,&fds);
/*Timeout*/
tv.tv_sec = TimeOut;
tv.tv_usec = 0;
r = select(cam_fd + 1,&fds,NULL,NULL,&tv);
if(-1 == r)
{
if(EINTR == errno)
continue;
perror("Fail to select");
exit(EXIT_FAILURE);
}
if(0 == r)
{
fprintf(stderr,"select Timeout\n");
exit(EXIT_FAILURE);
}
startTime = clock();
if(read_frame(cam_fd))
{
finishTime = clock();
// printf("delta:%dms\n", (finishTime - startTime)/1000);
break;
}
}
usleep(CapDelay);
}
return 0;
}
void stop_capturing(int cam_fd)
{
enum v4l2_buf_type type;
type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if(-1 == ioctl(cam_fd,VIDIOC_STREAMOFF,&type))
{
perror("Fail to ioctl 'VIDIOC_STREAMOFF'");
exit(EXIT_FAILURE);
}
return;
}
void uninit_camer_device()
{
unsigned int i;
for(i = 0;i < n_buffer;i ++)
{
if(-1 == munmap(user_buf[i].start, user_buf[i].length))
{
exit(EXIT_FAILURE);
}
}
if (-1 == munmap(fb_buf, lcd_buf_size))
{
perror(" Error: framebuffer device munmap() failed.\n");
exit (EXIT_FAILURE) ;
}
free(user_buf);
return;
}
void close_camer_device(int lcd_fd, int cam_fd)
{
if(-1 == close(lcd_fd))
{
perror("Fail to close lcd_fd");
exit(EXIT_FAILURE);
}
if(-1 == close(cam_fd))
{
perror("Fail to close cam_fd");
exit(EXIT_FAILURE);
}
return;
}
int main()
{
int lcd_fd;
int cam_fd;
if((tsp_fd = open("/dev/event0", O_RDWR)) < 0)
{
printf("Fail to open");
return -1;
}
lcd_fd = open_lcd_device();
cam_fd = open_camer_device();
pthread_create(&capture_tid,NULL,capture_thread,(void *)NULL);
init_device(lcd_fd, cam_fd);
// init_mmap(lcd_fd, cam_fd);
start_capturing(cam_fd);
mainloop(cam_fd);
stop_capturing(cam_fd);
uninit_camer_device();
close_camer_device(lcd_fd, cam_fd);
return 0;
}

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