unsafe public VideoFormat(int width, int height, AVPixelFormat pixelFormat, int align = 8)
{
if (!align.IsPowOf2())
{
throw new ArgumentException($"对齐数必须是2的整数幂", nameof(align));
}
Width = width;
Height = height;
PixelFormat = pixelFormat;
Align = align;
Bytes = FF.av_image_get_buffer_size(pixelFormat, width, height, align).CheckFFmpegCode();
PlaneCount = FF.av_pix_fmt_count_planes(pixelFormat).CheckFFmpegCode();
//--- 参考 imgutils.c 的 av_image_fill_arrays
var stridesTmp = stackalloc int[4];
FF.av_image_fill_linesizes(stridesTmp, pixelFormat, width).CheckFFmpegCode();
strides = new int[PlaneCount];
for (int i = 0; i < PlaneCount; i++)
{
strides[i] = (stridesTmp[i] + (align - 1)) & ~(align - 1);
}
//---
}
