yuv420转yuv422(yuyv)

网上都是yuv422转yuv420，很少有yuv420转yuv422。
本次从bgr转yuv420，然后基于yuv420转yuv422

int pixeltransform::bgr2yvyu422(cv::Mat srcimg, unsigned char *pdst)
{//BGR To I420cv::Mat dstimg;cv::cvtColor(srcimg, dstimg, cv::COLOR_BGR2YUV_I420);int width = srcimg.cols;int height = srcimg.rows;int nLenY = width * height;int nLenU = nLenY / 4;unsigned char *i420bytes = dstimg.data;unsigned char *i420y = NULL;i420y = (unsigned char *)malloc(width * height);unsigned char *i420u = NULL;i420u = (unsigned char *)malloc(width * height / 4);unsigned char *i420v = NULL;i420v = (unsigned char *)malloc(width * height / 4);memcpy(i420y, i420bytes, nLenY);  //Yfor (int i = 0; i < nLenU; i++) {i420u[i] = i420bytes[nLenY + i];          //Ui420v[i] = i420bytes[nLenY + nLenU + i];  //V}int ySrcIndex = 0;int uSrcIndex = 0;int vSrcIndex = 0;int yDstIndex = 0;//I420 to YUYVfor (int i = 0; i < height / 2; i++) {int uvWidth = width;for (int k = 0; k < uvWidth / 2; k++) {// Ypdst[yDstIndex] = i420y[ySrcIndex];pdst[yDstIndex + uvWidth * 2] = i420y[ySrcIndex + uvWidth];yDstIndex++;ySrcIndex++;// Updst[yDstIndex] = i420u[uSrcIndex];pdst[yDstIndex + uvWidth * 2] = i420u[uSrcIndex];yDstIndex++;// Ypdst[yDstIndex] = i420y[ySrcIndex];pdst[yDstIndex + uvWidth * 2] = i420y[ySrcIndex + uvWidth];yDstIndex++;ySrcIndex++;// Vpdst[yDstIndex] = i420v[vSrcIndex];pdst[yDstIndex + uvWidth * 2] = i420v[vSrcIndex];yDstIndex++;uSrcIndex += 1;vSrcIndex += 1;}yDstIndex += uvWidth * 2;ySrcIndex += uvWidth;}free(i420y);free(i420u);free(i420v);return 0;
}

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