YUV格式圖像補黑邊

原理：https://blog.csdn.net/andrew57/article/details/79644442

 

1、直接使用libyuv庫 libyuv::I420Scale 

注意：要提前給原始YUV圖像分配補邊后內存，否則可能崩潰

 

2、自己實現，原始YUV保持原本的大小就可以

代碼：

    int offset_in = 0;
    int offset_out = 0;
    for (int i = 0; i < inHeight; ++i)
    {
        // Y
        memcpy(YUV_out + offset_out, YUV_in + offset_in, inWidth);
        offset_out += outWidth;
        offset_in += inWidth;
    }
    offset_out += (outHeight - inHeight) * outWidth;
    for (int i = 0; i < inHeight / 2; ++i)
    {
        // U
        memcpy(YUV_out + offset_out, YUV_in + offset_in, inWidth / 2);
        offset_out += outWidth / 2;
        offset_in += inWidth / 2;
    }
    offset_out += (outHeight - inHeight) * outWidth / 4;
    for (int i = 0; i < inHeight / 2; ++i)
    {
        // V
        memcpy(YUV_out + offset_out, YUV_in + offset_in, inWidth / 2);
        offset_out += outWidth / 2;
        offset_in += inWidth / 2;
    }