[FFmpeg-devel] [PATCH] lavu: support arbitrary-point FFT and all even (i)MDCT transforms

[Lynne]

This patch adds support for arbitrary-point FFTs and all even MDCT 
transforms.
Odd MDCTs are not supported yet as they're based on the DCT-II and DCT-III
and they're very niche.

With this we can now write tests.

Patch attached.

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