yuyv图像转rgb后转bmp的一个简单demo

yuyv转rgb的公式：
r = 1.164*(y-16) + 1.159*(v-128);
g = 1.164*(y-16) - 0.380*(u-128) - 0.813*(v-128);
b = 1.164*(y-16) + 2.018*(u-128);

#include <fcntl.h>#include <stdlib.h>#include <sys/ioctl.h>#include <sys/types.h>#include <unistd.h>#include <stdio.h>#define WIDTH  640#define HEIGHT 480#define YUYV_FILE "./0.yuyv"#define BMP_FILE  "./out.bmp"typedef struct                       /**** BMP file header structure ****/{    unsigned short bftype;    unsigned int   bfSize;           /* Size of file */    unsigned short bfReserved1;      /* Reserved */    unsigned short bfReserved2;      /* ... */    unsigned int   bfOffBits;        /* Offset to bitmap data */} BITMAPFILEHEADER;typedef struct                       /**** BMP file info structure ****/{    unsigned int   biSize;           /* Size of info header */    int            biWidth;          /* Width of image */    int            biHeight;         /* Height of image */    unsigned short biPlanes;         /* Number of color planes */    unsigned short biBitCount;       /* Number of bits per pixel */    unsigned int   biCompression;    /* Type of compression to use */    unsigned int   biSizeImage;      /* Size of image data */    int            biXPelsPerMeter;  /* X pixels per meter */    int            biYPelsPerMeter;  /* Y pixels per meter */    unsigned int   biClrUsed;        /* Number of colors used */    unsigned int   biClrImportant;   /* Number of important colors */} BITMAPINFOHEADER;int yuv_to_rgb_pixel(int y, int u, int v){    unsigned int pixel24 = 0;    unsigned char *pixel = (unsigned char *)&pixel24;    int r, g, b;    static long int ruv, guv, buv;    r = 1.164*(y-16) + 1.159*(v-128);    g = 1.164*(y-16) - 0.380*(u-128) - 0.813*(v-128);    b = 1.164*(y-16) + 2.018*(u-128);    r = r > 255 ? 255 : r;    g = g > 255 ? 255 : g;    b = b > 255 ? 255 : b;    r = r < 0 ? 0 : r;    g = g < 0 ? 0 : g;    b = b < 0 ? 0 : b;    pixel[0] = r;    pixel[1] = g;    pixel[2] = b;    return pixel24;}int yuyv_to_rgb(unsigned char *yuv, unsigned char *rgb, unsigned int width, unsigned int height){    unsigned int in, out;    int y0, u, y1, v;    unsigned int pixel24;    unsigned char *pixel = (unsigned char *)&pixel24;    unsigned int size = width*height*2;    for (in = 0, out = 0; in < size; in += 4, out += 6)    {      /*特殊说明，因bmp文件是以bgr顺序排列而不是rgb，故此u，v颠倒*/        y0 = yuv[in+0];        v  = yuv[in+1];//u  = yuv[in+1];        y1 = yuv[in+2];        u  = yuv[in+3];//v  = yuv[in+3];        pixel24 = yuv_to_rgb_pixel(y0, u, v);        rgb[out+0] = pixel[0];        rgb[out+1] = pixel[1];        rgb[out+2] = pixel[2];        pixel24 = yuv_to_rgb_pixel(y1, u, v);        rgb[out+3] = pixel[0];        rgb[out+4] = pixel[1];        rgb[out+5] = pixel[2];    }    return 0;}void SaveBmp(const char *filename,unsigned char *rgb,int width,int height){    BITMAPFILEHEADER bf;    BITMAPINFOHEADER bi;    bf.bftype = 0x4d42;    bf.bfReserved1 = 0;    bf.bfReserved2 = 0;    /*其中这两项为何减去2，是因为结构体对齐问题，sizeof(BITMAPFILEHEADER)并不是14，而是16*/    bf.bfSize = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)+width*height*3-2;    bf.bfOffBits = sizeof(BITMAPFILEHEADER) + sizeof(BITMAPINFOHEADER)-2;//0x36    bi.biSize = sizeof(BITMAPINFOHEADER);    bi.biWidth = width;    bi.biHeight = -height;//height    bi.biPlanes = 1;    bi.biBitCount = 24;    bi.biCompression = 0;    bi.biSizeImage = width*height*3;    bi.biXPelsPerMeter = 5000;    bi.biYPelsPerMeter = 5000;    bi.biClrUsed = 0;    bi.biClrImportant = 0;    FILE *file = fopen(filename, "wb");    if (!file)    {        printf("file open failed\n");        return;    }    /*这里不直接写fwrite(&bf,sizeof(bf),1,file);原因，      因为结构体对齐原因，其实第一个bf.bftype并不是占用两个字节，而是4个字节，sizeof      就是16了，显然不对，bmp固定文件头为14个字节。故按如下方式处理。    */    fwrite(&bf.bftype,2,1,file);    fwrite((&bf.bftype)+2,12,1,file);    fwrite(&bi,sizeof(bi),1, file);    fwrite(rgb,width*height*3,1,file);    fclose(file);}int main(){  /*声明数组，存储yuyv数据和rgb数据*/  /*因已知格式为yuyv，640*480.这里就直接声明两个数组，分别为640*480*2 和 640*480*3大小*/  unsigned char yuyv[WIDTH*HEIGHT*2],rgb[WIDTH*HEIGHT*3];  /*打开yuyv文件并读取*/  FILE *fd_yuv = fopen(YUYV_FILE,"r");  if(fd_yuv == NULL){    printf("open yuyv picture failed\n");    return -1;  }  fread(yuyv,1,WIDTH*HEIGHT*2,fd_yuv);  fclose(fd_yuv);  /*yuyv转rgb格式*/  yuyv_to_rgb(yuyv,rgb,WIDTH,HEIGHT);  /*rgb转为bmp存储到文件*/  SaveBmp(BMP_FILE,rgb,WIDTH,HEIGHT);  return 0;}

yuyv原图yuyv原图地址

转换成功后的bmp图：