[opus] Query regarding FFT in Opus

[Mahantesh Belakhindi]

Dear Experts,

I want to know if the KISS FFT in opus can be replaced with fast FFT. What
are the implications & things to be taken care if this is done.

Also, I saw in FFT code comments that in-line FFT not supported. Please let
me know the reason for this.

Thanks in advance.

Regards,
Mahantesh
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