[vorbis] equalization

[Segher Boessenkool]

> the point is:
> the decoder works in the frequency domain.
> if you do the equalization after the decoding, you'll have to do
> two extra FFTs.

There exist much cheaper ways of doing equalization than running a few
FFT's; for example, just do some IIR filtering or whatever.

Cheers,

Segher

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