synfx-dsp

synfx-dsp DSP实时音频合成、效果算法和实用工具

本库中的大部分算法和实现已针对HexoDSP实现并用于HexoSynth。由于它们在其他环境中也很有用，例如synfx-dsp-jit crate，因此我将它们提取出来。

我从各种GPLv3兼容的来源收集了本crate中的大部分算法。它们还部分翻译自多个不同的C++项目。我在此crate的注释中尽力记录了源代码和源代码许可。如果遗漏了任何归属，我将欢迎补丁或报告。

请自由使用这些算法和实用工具。如果它们符合GPL-3.0-or-later许可并且不会破坏HexoDSP的测试套件，则将赞赏帮助、补丁和添加。

注意： HexoDSP附带一个大型测试套件，它还涵盖了这些算法。而且，这些算法也要通过测试。另一方面，这些实现实际上也被测试套件所覆盖。

由于std::simd!，自2022年10月2日起需要Nightly版

版权、许可、归属、贡献

以下是从本库中复制或翻译代码的部分来源列表

• crate::quicker_tanh64 / crate::quicker_tanh

  quickerTanh / quickerTanh64 credits to mopo synthesis library:
  Under GPLv3 or any later.
  Little IO <[email protected]>
  Matt Tytel <[email protected]>
  

• crate::quick_tanh64 / crate::quick_tanh

  quickTanh / quickTanh64 credits to mopo synthesis library:
  Under GPLv3 or any later.
  Little IO <[email protected]>
  Matt Tytel <[email protected]>
  

• crate::tanh_approx_drive

  Taken from ValleyAudio
  Copyright Dale Johnson
  https://github.dev/ValleyAudio/ValleyRackFree/tree/v2.0
  Under GPLv3 license
  

• crate::AtomicFloat

  Implementation from vst-rs
  https://github.com/RustAudio/vst-rs/blob/master/src/util/atomic_float.rs
  Under MIT License
  Copyright (c) 2015 Marko Mijalkovic
  

• crate::Biquad

  The implementation of this Biquad Filter has been adapted from
  SamiPerttu, Copyright (c) 2020, under the MIT License.
  See also: https://github.com/SamiPerttu/fundsp/blob/master/src/filter.rs
  

• crate::DattorroReverb

  This file contains a reverb implementation that is based
  on Jon Dattorro's 1997 reverb algorithm. It's also largely
  based on the C++ implementation from ValleyAudio / ValleyRackFree
  
  ValleyRackFree Copyright (C) 2020, Valley Audio Soft, Dale Johnson
  Adapted under the GPL-3.0-or-later License.
  
  See also: https://github.com/ValleyAudio/ValleyRackFree/blob/v1.0/src/Plateau/Dattorro.cpp
       and: https://github.com/ValleyAudio/ValleyRackFree/blob/v1.0/src/Plateau/Dattorro.hpp
  
  And: https://ccrma.stanford.edu/~dattorro/music.html
  And: https://ccrma.stanford.edu/~dattorro/EffectDesignPart1.pdf
  

• crate::process_1pole_lowpass / crate::process_1pole_highpass

  one pole lp from valley rack free:
  https://github.com/ValleyAudio/ValleyRackFree/blob/v1.0/src/Common/DSP/OnePoleFilters.cpp
  

• crate::process_1pole_tpt_lowpass / crate::process_1pole_tpt_highpass

  one pole from:
  http://www.willpirkle.com/Downloads/AN-4VirtualAnalogFilters.pdf
  (page 5)
  

• crate::FixedOnePole

  Fixed one pole with setable pole and gain.
  Implementation taken from tubonitaub / alec-deason
  from https://github.com/alec-deason/virtual_modular/blob/4025f1ef343c2eb9cd74eac07b5350c1e7ec9c09/src/simd_graph.rs#L4292
  under MIT License
  

• crate::process_hal_chamberlin_svf

  Hal Chamberlin's State Variable (12dB/oct) filter
  https://www.earlevel.com/main/2003/03/02/the-digital-state-variable-filter/
  Inspired by SynthV1 by Rui Nuno Capela, under the terms of
  GPLv2 or any later:
  

• crate::process_simper_svf

  Simper SVF implemented from
  https://cytomic.com/files/dsp/SvfLinearTrapezoidalSin.pdf
  Big thanks go to Andrew Simper @ Cytomic for developing and publishing
  the paper.
  

• crate::process_stilson_moog

  Stilson/Moog implementation partly translated from here:
  https://github.com/ddiakopoulos/MoogLadders/blob/master/src/MusicDSPModel.h
  without any copyright as found on musicdsp.org
  (http://www.musicdsp.org/showone.php?id=24).
  
  It's also found on MusicDSP and has probably no proper license anyways.
  See also: https://github.com/ddiakopoulos/MoogLadders
  and https://github.com/rncbc/synthv1/blob/master/src/synthv1_filter.h#L103
  and https://github.com/ddiakopoulos/MoogLadders/blob/master/src/MusicDSPModel.h
  

• crate::DCBlockFilter

  translated from Odin 2 Synthesizer Plugin
  Copyright (C) 2020 TheWaveWarden
  under GPLv3 or any later
  

• crate::cubic_interpolate

  Hermite interpolation, take from
  https://github.com/eric-wood/delay/blob/main/src/delay.rs#L52
  
  Thanks go to Eric Wood!
  
  For the interpolation code:
  MIT License, Copyright (c) 2021 Eric Wood
  

• crate::TriSawLFO

  Adapted from https://github.com/ValleyAudio/ValleyRackFree/blob/v1.0/src/Common/DSP/LFO.hpp
  
  ValleyRackFree Copyright (C) 2020, Valley Audio Soft, Dale Johnson
  Adapted under the GPL-3.0-or-later License.
  

• crate::PolyBlepOscillator

  PolyBLEP by Tale
  (slightly modified)
  http://www.kvraudio.com/forum/viewtopic.php?t=375517
  from http://www.martin-finke.de/blog/articles/audio-plugins-018-polyblep-oscillator/
  

• crate::VPSOscillator

  This oscillator is based on the work "VECTOR PHASESHAPING SYNTHESIS"
  by: Jari Kleimola*, Victor Lazzarini†, Joseph Timoney†, Vesa Välimäki*
  *Aalto University School of Electrical Engineering Espoo, Finland;
  †National University of Ireland, Maynooth Ireland
  
  See also this PDF: http://recherche.ircam.fr/pub/dafx11/Papers/55_e.pdf
  

• crate::Oversampling

  Loosely adapted from https://github.com/VCVRack/Befaco/blob/v1/src/ChowDSP.hpp
  Copyright (c) 2019-2020 Andrew Belt and Befaco contributors
  Under GPLv-3.0-or-later
  
  Which was originally taken from https://github.com/jatinchowdhury18/ChowDSP-VCV/blob/master/src/shared/AAFilter.hpp
  Copyright (c) 2020 jatinchowdhury18
  

• crate::next_xoroshiro128

  Taken from xoroshiro128 crate under MIT License
  Implemented by Matthew Scharley (Copyright 2016)
  https://github.com/mscharley/rust-xoroshiro128
  

• crate::u64_to_open01

  Taken from rand::distributions
  Licensed under the Apache License, Version 2.0
  Copyright 2018 Developers of the Rand project.
  

• crate::SplitMix64

  Copyright 2018 Developers of the Rand project.
  
  Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
  https://apache.ac.cn/licenses/LICENSE-2.0> or the MIT license
  <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
  option. This file may not be copied, modified, or distributed
  except according to those terms.
  - splitmix64 (http://xoroshiro.di.unimi.it/splitmix64.c)
  

• crate::f_distort / crate::f_fold_distort

  Ported from LMMS under GPLv2
  * DspEffectLibrary.h - library with template-based inline-effects
  * Copyright (c) 2006-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
  
  Original source seems to be musicdsp.org, Author: Bram de Jong
  see also: https://www.musicdsp.org/en/latest/Effects/41-waveshaper.html
  

• crate::PolyIIRHalfbandFilter

  Taken from va-filter by Fredemus aka Frederik Halkjær aka RocketPhysician
  https://github.com/Fredemus/va-filter
  Under License GPL-3.0-or-later
  
  originally translated from the freely available source code
  at https://www.musicdsp.org/en/latest/Filters/39-polyphase-filters.html
  

• crate::DCFilterX4

  Basic 4 channel SIMD DC-filter from Understanding Digital Signal Processing by Richard Lyons.
  
  Taken from va-filter by Fredemus aka Frederik Halkjær aka RocketPhysician
  https://github.com/Fredemus/va-filter
  Under License GPL-3.0-or-later
  

• crate::fh_va::LadderFilter / crate::fh_va::Svf / crate::fh_va::SallenKey

  Taken from va-filter by Fredemus aka Frederik Halkjær aka RocketPhysician
  https://github.com/Fredemus/va-filter
  Under License GPL-3.0-or-later
  

许可：GPL-3.0或更新版本