adsp is a collection of template classes for audio dsp using SIMD instructions for x86 processors.
Each template class abstracts over the many SIMD instructions sets, and will choose what it's better suited for the architecture it is compiled for, given the number of audio channel you want to process in parallel and the floating point precision that you specify.
adsp depends on avec, a library that wraps Agner Fog's vectorclass, and provides containers and views over aligned memory.
The file Spline.hpp implements cubic Hermite splines with (optionally) smoothly automatable knots.
The file StateVariable.hpp implements linear and non-linear state variable filters, as described in the book The art of VA filter design by Vadim Zavalishin, using the cheap zero-delay method by Teemu Voipio, see https://www.kvraudio.com/forum/viewtopic.php?f=33&t=349859.
The file GammaEnv.hpp implements gammaenv, an envelope follower by Aleksey Vaneev, with some minor customizations.
The file OnePole.hpp implements simple one pole filters, also as described in The art of VA filter design.
The file SimpleHighPass.hpp implements naive one pole high pass filter, suitable for DC removal.
The file Biquad.hpp implements simple biquad filters from the RBJ cookbook.