YUYV格式到RGB格式的转换

为什么YUYV格式要转到RGB格式，视频的显示调用的多数API都是基于RGB格式，所以需要进行格式的转换。

YUYV格式如下：
Y0U0Y1V0 Y2U1Y3V1..........
说明：一个Y代表一个像素，而一个Y和UV组合起来构成一个像素，所以第0个像素Y0和第一个像素Y1都是共用第0个像素的U0和V0。而每个分量Y，U，V都是占用一个字节的存储空间。所以Y0U0Y1V0相当于两个像素，占用了4个字节的存储空间，平均一个像素占用两个字节。

RGB格式：
R0G0B0 R1G1B1.........
说明：一个像素由三个分量构成，即一个像素占用三个字节。

YUV到RGB的转换有如下公式：
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));

 int yuvtorgb0(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*;

     for (in = , out = ; in < size; in += , out += )
     {
         y0 = yuv[in+];
         u  = yuv[in+];
         y1 = yuv[in+];
         v  = yuv[in+];

         sign3 = true;
         pixel24 = yuvtorgb(y0, u, v);
         rgb[out+] = pixel[];    //for QT
         rgb[out+] = pixel[];
         rgb[out+] = pixel[];
         //rgb[out+0] = pixel[2];  //for iplimage
         //rgb[out+1] = pixel[1];
         //rgb[out+2] = pixel[0];

         //sign3 = true;
         pixel24 = yuvtorgb(y1, u, v);
         rgb[out+] = pixel[];
         rgb[out+] = pixel[];
         rgb[out+] = pixel[];
         //rgb[out+3] = pixel[2];
         //rgb[out+4] = pixel[1];
         //rgb[out+5] = pixel[0];
     }
     return ;
 }

 int yuvtorgb(int y, int u, int v)
 {
     unsigned int pixel24 = ;
     unsigned char *pixel = (unsigned char *)&pixel24;
     int r, g, b;
     static long int ruv, guv, buv;

     if (sign3)
     {
         sign3 = false;
         ruv = *(v-);
         guv = *(u-) + *(v-);
         buv = *(u-);
     }

     r = (*(y-) + ruv) / ;
     g = (*(y-) - guv) / ;
     b = (*(y-) + buv) / ;

     if (r > ) r = ;
     if (g > ) g = ;
     if (b > ) b = ;
     if (r < ) r = ;
     if (g < ) g = ;
     if (b < ) b = ;

     pixel[] = r;
     pixel[] = g;
     pixel[] = b;

     return pixel24;
 }

http://blog.chinaunix.net/uid-21410064-id-3248638.html