linux

2016-08-31 19:32:38 -0400
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <sys/ioctl.h>
#include <asm/types.h>
#include <linux/videodev2.h>
#include <linux/fb.h>

static unsigned int capframe = 0;
static unsigned char filename[30];
FILE *bmpFile;

unsigned char bmp_head_t[] = {
0x42,0x4d,0x42,0x58,0x02,0x00,0x00,0x00,0x00,0x00,
0x42,0x00,0x00,0x00,0x28,0x00,0x00,0x00,0xf0,0x00,
0x00,0x00,0x40,0x01,0x00,0x00,0x01,0x00,0x10,0x00,
0x03,0x00,0x00,0x00,0x00,0x58,0x02,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0xf8,0x00,0x00,0xe0,0x07,
0x00,0x00,0x1f,0x00,0x00,0x00
};

static int fb_bpp;
unsigned char bmp_head[54];

static int fb_fp = -1;
static char *fb_addr = NULL;

int width=0;
int height=0;

static inline int fb_init(void)
{
int dev_fp = -1;
int fb_size;
struct fb_var_screeninfo vinfo;

dev_fp = open("/dev/fb0", O_RDWR);
if (dev_fp < 0) {
perror("/dev/fb0");
return -1;
}
if (ioctl(dev_fp, FBIOGET_VSCREENINFO, &vinfo)) {
printf("Error reading variable information.\n");
exit(1);
}
width=vinfo.xres;
height=vinfo.yres;
fb_bpp=vinfo.bits_per_pixel;
if(fb_bpp==24) fb_bpp=32;
fb_size=width*height*fb_bpp/8;
if ((fb_addr = (char*)mmap(0, fb_size,
PROT_READ | PROT_WRITE, MAP_SHARED, dev_fp, 0)) < 0) {
perror("mmap()");
return -1;
}
printf("%dx%d bpp:%d mmaped 0x%08x\n",width,height,fb_bpp,fb_addr);

return dev_fp;
}

void writeImageToFile(unsigned int size)
{
capframe++;
sprintf(filename,"/test/0%d.bmp",capframe);
bmpFile=fopen(filename, "w+");
if(fb_bpp == 16)
fwrite(bmp_head_t,1,66,bmpFile);
else
fwrite(bmp_head,1,54,bmpFile);
fwrite(fb_addr,1,size,bmpFile);
fclose(bmpFile);
}

int main(int argc, char *argv[])
{
unsigned int i = 10;
unsigned long size = 0;
fb_fp = fb_init();
size=width*height*fb_bpp/8;

if(fb_bpp==16){
*((unsigned int*)(bmp_head_t+18)) = width;
*((unsigned int*)(bmp_head_t+22)) = height;
*((unsigned short*)(bmp_head+28)) = 16;
}else{
bmp_head[0] = 'B';
bmp_head[1] = 'M';
*((unsigned int*)(bmp_head+2)) = (width*fb_bpp/8)*height+54;
*((unsigned int*)(bmp_head+10)) = 54;
*((unsigned int*)(bmp_head+14)) = 40;
*((unsigned int*)(bmp_head+18)) = width;
*((unsigned int*)(bmp_head+22)) = height;
*((unsigned short*)(bmp_head+26)) = 1;
*((unsigned short*)(bmp_head+28)) = fb_bpp;
*((unsigned short*)(bmp_head+34)) = (width*fb_bpp/8)*height;
}

while(i--)
{

writeImageToFile(size);

}


return 0;
}
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