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