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弄了一下午，感觉优化的还可以了，欢迎提出更好的优化方案。 //*/ // Converter of YV12 to RGB24 // the size of pYUV is (3 * iWidth * iHeight / 2) // and size of pRGB is (3 * iWidth * iHeight) // if sucess return true, else return false bool YV12_to_RGB24(unsigned char* pYV12, unsigned char* pRGB24, int iWidth, int iHeight) { if(!pYV12 || !pRGB24) return false; const long nYLen = long(iHeight * iWidth); const int nHfWidth = (iWidth>>1); if(nYLen<1 || nHfWidth<1) return false; // yv12's data structure // |WIDTH | // y......y-------- // y......y HEIGHT // y......y // y......y-------- // v..v // v..v // u..u // u..u unsigned char* yData = pYV12; unsigned char* vData = &yData[nYLen]; unsigned char* uData = &vData[nYLen>>2]; if(!uData || !vData) return false; // Convert YV12 to RGB24 // // formula // [1 1 1 ] // [r g b] = [y u-128 v-128] [0 0.34375 0 ] // [1.375 0.703125 1.734375] // another formula // [1 1 1 ] // [r g b] = [y u-128 v-128] [0 0.698001 0 ] // [1.370705 0.703125 1.732446] int rgb[3]; int i, j, m, n, x, y; m = -iWidth; n = -nHfWidth; for(y=0; y { m += iWidth; if(!(y % 2)) n += nHfWidth; for(x=0; x { i = m + x; j = n + (x>>1); rgb[2] = int(yData[i] + 1.370705 * (vData[j] - 128)); // r rgb[1] = int(yData[i] - 0.698001 * (uData[j] - 128) - 0.703125 * (vData[j] - 128)); // g rgb[0] = int(yData[i] + 1.732446 * (uData[j] - 128)); // b j = nYLen - iWidth - m + x; i = (j<<1) + j; for(j=0; j<3; j++) { if(rgb[j]>=0 && rgb[j]<=255) pRGB24[i + j] = rgb[j]; else pRGB24[i + j] = (rgb[j] < 0)? 0 : 255; } } } return true; } //*/ (iwgh) |