YUV格式图像补黑边

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

1、直接使用libyuv库 libyuv::I420Scale

注意：要提前给原始YUV图像分配补边后内存，否则可能崩溃

2、自己实现，原始YUV保持原本的大小就可以

代码：

 1     int offset_in = 0;
 2     int offset_out = 0;
 3     for (int i = 0; i < inHeight; ++i)
 4     {
 5         // Y
 6         memcpy(YUV_out + offset_out, YUV_in + offset_in, inWidth);
 7         offset_out += outWidth;
 8         offset_in += inWidth;
 9     }
10     offset_out += (outHeight - inHeight) * outWidth;
11     for (int i = 0; i < inHeight / 2; ++i)
12     {
13         // U
14         memcpy(YUV_out + offset_out, YUV_in + offset_in, inWidth / 2);
15         offset_out += outWidth / 2;
16         offset_in += inWidth / 2;
17     }
18     offset_out += (outHeight - inHeight) * outWidth / 4;
19     for (int i = 0; i < inHeight / 2; ++i)
20     {
21         // V
22         memcpy(YUV_out + offset_out, YUV_in + offset_in, inWidth / 2);
23         offset_out += outWidth / 2;
24         offset_in += inWidth / 2;
25     }

YUV格式图像补黑边

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