CIF格式文件转BMP文件

笔者注：CIF文件内存放的是352*288真彩色数据

 #include <stdio.h>
 #include <stdlib.h>

 #define WIDTH 352
 #define HEIGHT 288

 //转换矩阵
 double YuvToRgb[3][3] = {1,   0      ,  1.4022   ,
                          1,   -0.3456,   -0.7145 ,
                          1,   1.771  ,   0       };

 //根据RGB三分量写BMP，不必关注
 int WriteBmp(int width, int height, unsigned char *R,unsigned char *G,unsigned char *B, char *BmpFileName);

 //转换函数
 int Convert(char *file, int width, int height, int n)
 {
     //变量声明
     int i = 0;
     int temp = 0;
     int x = 0;
     int y = 0;
     int fReadSize = 0;
     int ImgSize = width*height;
     FILE *fp = NULL;
     unsigned char* yuv = NULL;
     unsigned char* rgb = NULL;
     unsigned char* cTemp[6];
     char BmpFileName[256];

     //申请空间
     int FrameSize = ImgSize + (ImgSize >> 1);
     yuv = (unsigned char *)malloc(FrameSize);
     rgb = (unsigned char *)malloc(ImgSize*3);
     //读取指定文件中的指定帧
     if((fp = fopen(file, "rb")) == NULL)
         return 0;
     fseek(fp, FrameSize*(n-1), SEEK_CUR);
     fReadSize = fread(yuv, 1, FrameSize, fp);
     fclose(fp);
     if(fReadSize < FrameSize)
         return 0;
     //转换指定帧  如果你不是处理文件 主要看这里
     cTemp[0] = yuv;                        //y分量地址
     cTemp[1] = yuv + ImgSize;              //u分量地址
     cTemp[2] = cTemp[1] + (ImgSize>>2);    //v分量地址
     cTemp[3] = rgb;                        //r分量地址
     cTemp[4] = rgb + ImgSize;              //g分量地址
     cTemp[5] = cTemp[4] + ImgSize;         //b分量地址
     for(y=0; y < height; y++)
         for(x=0; x < width; x++)
         {
             //r分量
             temp = cTemp[0][y*width+x] + (cTemp[2][(y/2)*(width/2)+x/2]-128) * YuvToRgb[0][2];
             cTemp[3][y*width+x] = temp<0 ? 0 : (temp>255 ? 255 : temp);
             //g分量
             temp = cTemp[0][y*width+x] + (cTemp[1][(y/2)*(width/2)+x/2]-128) * YuvToRgb[1][1]
                                        + (cTemp[2][(y/2)*(width/2)+x/2]-128) * YuvToRgb[1][2];
             cTemp[4][y*width+x] = temp<0 ? 0 : (temp>255 ? 255 : temp);
             //b分量
             temp = cTemp[0][y*width+x] + (cTemp[1][(y/2)*(width/2)+x/2]-128) * YuvToRgb[2][1];
             cTemp[5][y*width+x] = temp<0 ? 0 : (temp>255 ? 255 : temp);
         }

     //写到BMP文件中
     sprintf(BmpFileName, "%s%05d.bmp", file, n);
     WriteBmp(width, height, cTemp[3], cTemp[4], cTemp[5], BmpFileName);

     free(yuv);
     free(rgb);
     return n;
 }
 //入口 没啥东西
 void main()
 {
     int i=1;
     for( i=0; i<260; i++)
         Convert("C://Documents and Settings//Administrator//桌面//cif//tempete.cif", WIDTH, HEIGHT, i);//获取文件的第i帧，此目录自定义
 }

 //写BMP  不必关注
 int WriteBmp(int width, int height, unsigned char *R,unsigned char *G,unsigned char *B, char *BmpFileName)
 {
     int x=0;
     int y=0;
     int i=0;
     int j=0;
     FILE *fp;
     unsigned char *WRGB;
     unsigned char *WRGB_Start;
     int yu = width*3%4;
     int BytePerLine = 0;

     yu = yu!=0 ? 4-yu : yu;
     BytePerLine = width*3+yu;

     if((fp = fopen(BmpFileName, "wb")) == NULL)
         return 0;
     WRGB = (unsigned char*)malloc(BytePerLine*height+54);
     memset(WRGB, 0, BytePerLine*height+54);

     //BMP头
     WRGB[0] = 'B';
     WRGB[1] = 'M';
     *((unsigned int*)(WRGB+2)) = BytePerLine*height+54;
     *((unsigned int*)(WRGB+10)) = 54;
     *((unsigned int*)(WRGB+14)) = 40;
     *((unsigned int*)(WRGB+18)) = width;
     *((unsigned int*)(WRGB+22)) = height;
     *((unsigned short*)(WRGB+26)) = 1;
     *((unsigned short*)(WRGB+28)) = 24;
     *((unsigned short*)(WRGB+34)) = BytePerLine*height;

     WRGB_Start = WRGB + 54;

     for(y=height-1,j=0; y >= 0; y--,j++)
     {
         for(x=0,i=0; x<width; x++)
         {
             WRGB_Start[y*BytePerLine+i++] = B[j*width+x];
             WRGB_Start[y*BytePerLine+i++] = G[j*width+x];
             WRGB_Start[y*BytePerLine+i++] = R[j*width+x];
         }
     }

     fwrite(WRGB, 1, BytePerLine*height+54, fp);
     free(WRGB);
     fclose(fp);
     return 1;
 }

运行结束后在cif目录里会有BMP文件