YUV操作工具类

YUVUtil.cpp

bool UYVYRotate90(unsigned char *src, unsigned char *dst, int width, int height) {
    const int copyBytes = 4;
    const int bytesPerLine = width << 1;
    const int step = height << 2;
    const int offset = (height - 1) * bytesPerLine;

    if (NULL == dst) {
        return false;
    }
    unsigned char *dest = dst;
    unsigned char *source = src;
    unsigned char *psrc = NULL;
    unsigned char *pdst[2] = {NULL, NULL};

    for (int i = 0; i < bytesPerLine; i += copyBytes) {
        pdst[0] = dest;
        pdst[1] = dest + (height << 1);
        psrc = source + offset;
        for (int j = 0; j < height; ++j) {
            int k = j % 2;
            // 拷贝4个字节
            *((unsigned int *) pdst[k]) = *((unsigned int *) psrc);

            // Y分量交换，保证每个像素点的亮度不改变否则产生锯齿
            if (1 == k) {
                unsigned char temp = *(pdst[0] - 1);
                *(pdst[0] - 1) = *(pdst[1] + 1);
                *(pdst[1] + 1) = temp;
            }
            pdst[k] += copyBytes;
            psrc -= bytesPerLine;
        }
        dest += step;
        source += copyBytes;
    }
    return true;
}


bool UYVYRotate270(unsigned char *src, unsigned char *dst, int width, int height) {
    const int copyBytes = 4;
    const int bytesPerLine = width << 1;
    const int step = height << 2;
    const int offset = bytesPerLine - copyBytes;
    //unsigned char *dst = (unsigned char *)malloc(bytesPerLine * height);

    if (NULL == dst) {
        return false;
    }
    unsigned char *dest = dst;
    unsigned char *source = src;
    unsigned char *psrc = NULL;
    unsigned char *pdst[2] = {NULL, NULL};

    for (int i = 0; i < bytesPerLine; i += copyBytes) {
        pdst[1] = dest;
        pdst[0] = dest + (height << 1);
        psrc = source + offset;

        for (int j = 0; j < height; ++j) {
            int k = j % 2;
            *((unsigned int *) pdst[k]) = *((unsigned int *) psrc);

            if (1 == k) {
                unsigned char temp = *(pdst[1] + 1);
                *(pdst[1] + 1) = *(pdst[0] - 1);
                *(pdst[0] - 1) = temp;
            }
            pdst[k] += copyBytes;
            psrc += bytesPerLine;
        }
        dest += step;
        source -= copyBytes;
    }
    //memcpy(src, dst, width * height * 2);
    //delete[] dst;

    return true;
}

Mat 与uchar* 互转 : https://answers.opencv.org/question/55869/c-convert-uchar-to-opencv-mat/
https://blog.csdn.net/martinkeith/article/details/104185734