Convert NV12 to BGR24 format.

NV12ToBGR24.cpp

void NV12ToBGR24(uint8_t* pYUV, uint8_t* pBGR24, int width, int height) {
    if(width < 1 || height < 1 || pYUV == NULL || pBGR24 == NULL)
        return;
    const long len = width * height;
    unsigned char* yData = pYUV;
    unsigned char* vData = &yData[len];
    unsigned char* uData = &vData[len >> 2];

    int bgr[3];
    int yIdx, uIdx, vIdx, idx;
    for(int i = 0; i < height; i++) {
        for(int j = 0; j < width; j++) {
            yIdx = i * width + j;
            vIdx = (i / 2) * (width / 2) + (j / 2);
            uIdx = vIdx;
            bgr[0] = (int)(yData[yIdx] + (uData[vIdx] - 128) + (((uData[vIdx] - 128) * 198) >> 8));                                    // b分量
            bgr[1] = (int)(yData[yIdx] - (((uData[vIdx] - 128) * 88) >> 8) - (((vData[vIdx] - 128) * 183) >> 8));    // g分量
            bgr[2] = (int)(yData[yIdx] + (vData[uIdx] - 128) + (((vData[uIdx] - 128) * 103) >> 8));

            for(int k = 0; k < 3; k++) {
                idx = (i * width + j) * 3 + k;
                if(bgr[k] >= 0 && bgr[k] <= 255)
                    pBGR24[idx] = bgr[k];
                else
                    pBGR24[idx] = (bgr[k] < 0) ? 0 : 255;
            }
        }
    }
    return;
}