YUV420、YUV422、RGB24转换

//平面YUV422转平面RGB24static void YUV422p_to_RGB24(unsigned char *yuv422[3], unsigned char *rgb24, int width, int height){ int R,G,B,Y,U,V; int x,y; int nWidth = width>>1; //色度信号宽度 for (y=0;y<height;y++) {  for (x=0;x<width;x++)  {   Y = *(yuv422[0] + y*width + x);   U = *(yuv422[1] + y*nWidth + (x>>1));   V = *(yuv422[2] + y*nWidth + (x>>1));   R = Y + 1.402*(V-128);   G = Y - 0.34414*(U-128) - 0.71414*(V-128);   B = Y + 1.772*(U-128);      //防止越界   if (R>255)R=255;   if (R<0)R=0;   if (G>255)G=255;   if (G<0)G=0;   if (B>255)B=255;   if (B<0)B=0;      *(rgb24 + ((height-y-1)*width + x)*3) = B;   *(rgb24 + ((height-y-1)*width + x)*3 + 1) = G;   *(rgb24 + ((height-y-1)*width + x)*3 + 2) = R;    } }}

//平面YUV420转平面YUV422static void YUV420p_to_YUV422p(unsigned char *yuv420[3], unsigned char *yuv422, int width, int height)  { int x, y; //亮度信号Y复制 int Ylen = width*height; memcpy(yuv422, yuv420[0], Ylen); //色度信号U复制 unsigned char *pU422 = yuv422 + Ylen; //指向U的位置 int Uwidth = width>>1; //422色度信号U宽度 int Uheight = height>>1; //422色度信号U高度  for (y = 0; y < Uheight; y++)  {           memcpy(pU422 + y*width,          yuv420[1] + y*Uwidth, Uwidth);  memcpy(pU422 + y*width + Uwidth, yuv420[1] + y*Uwidth, Uwidth); } //色度信号V复制 unsigned char *pV422 = yuv422 + Ylen + (Ylen>>1); //指向V的位置 int Vwidth = Uwidth; //422色度信号V宽度 int Vheight = Uheight; //422色度信号U宽度 for (y = 0; y < Vheight; y++)  {    memcpy(pV422 + y*width,          yuv420[2] + y*Vwidth, Vwidth);  memcpy(pV422 + y*width + Vwidth, yuv420[2] + y*Vwidth, Vwidth); } }

//平面YUV420转RGB24static void YUV420p_to_RGB24(unsigned char *yuv420[3], unsigned char *rgb24, int width, int height) {//  int begin = GetTickCount(); int R,G,B,Y,U,V; int x,y; int nWidth = width>>1; //色度信号宽度 for (y=0;y<height;y++) {  for (x=0;x<width;x++)  {   Y = *(yuv420[0] + y*width + x);   U = *(yuv420[1] + ((y>>1)*nWidth) + (x>>1));   V = *(yuv420[2] + ((y>>1)*nWidth) + (x>>1));   R = Y + 1.402*(V-128);   G = Y - 0.34414*(U-128) - 0.71414*(V-128);   B = Y + 1.772*(U-128);

   //防止越界   if (R>255)R=255;   if (R<0)R=0;   if (G>255)G=255;   if (G<0)G=0;   if (B>255)B=255;   if (B<0)B=0;      *(rgb24 + ((height-y-1)*width + x)*3) = B;   *(rgb24 + ((height-y-1)*width + x)*3 + 1) = G;   *(rgb24 + ((height-y-1)*width + x)*3 + 2) = R;//    *(rgb24 + (y*width + x)*3) = B;//    *(rgb24 + (y*width + x)*3 + 1) = G;//    *(rgb24 + (y*width + x)*3 + 2) = R;     } }}

 

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