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falkTXfalkTX
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Update dpf, start of filter plugin
Signed-off-by: falkTX <falktx@falktx.com>
1 parent af270b0 commit 43df48f

8 files changed

Lines changed: 608 additions & 2 deletions

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‎Makefile‎

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@@ -22,6 +22,7 @@ plugins: dgl
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$(MAKE) all -C plugins/Compressor
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$(MAKE) all -C plugins/ConvolutionReverb
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$(MAKE) all -C plugins/DevilDistortion
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$(MAKE) all -C plugins/Filter
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# $(MAKE) all -C plugins/Sampler
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ifneq ($(CROSS_COMPILING),true)
@@ -45,6 +46,7 @@ clean:
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$(MAKE) clean -C plugins/Compressor
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$(MAKE) clean -C plugins/ConvolutionReverb
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$(MAKE) clean -C plugins/DevilDistortion
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$(MAKE) clean -C plugins/Filter
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# $(MAKE) clean -C plugins/Sampler
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rm -rf bin build dpf-widgets/opengl/*.d dpf-widgets/opengl/*.o
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rm -f 3rd-party/FFTConvolver/*.d 3rd-party/FFTConvolver/*.o

‎dpf‎

Submodule dpf updated 35 files

‎dpf-widgets‎

‎plugins/Filter/Biquad.cpp‎

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//
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// Biquad.cpp
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//
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// Created by Nigel Redmon on 11/24/12
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// EarLevel Engineering: earlevel.com
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// Copyright 2012 Nigel Redmon
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//
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// For a complete explanation of the Biquad code:
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// http://www.earlevel.com/main/2012/11/26/biquad-c-source-code/
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//
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// License:
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//
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// This source code is provided as is, without warranty.
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// You may copy and distribute verbatim copies of this document.
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// You may modify and use this source code to create binary code
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// for your own purposes, free or commercial.
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//
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#include <math.h>
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#include "Biquad.h"
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Biquad::Biquad() {
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type = bq_type_lowpass;
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a0 = 1.0;
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a1 = a2 = b1 = b2 = 0.0;
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Fc = 0.50;
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Q = 0.707;
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peakGain = 0.0;
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z1 = z2 = 0.0;
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}
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Biquad::Biquad(int type, double Fc, double Q, double peakGainDB) {
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setBiquad(type, Fc, Q, peakGainDB);
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z1 = z2 = 0.0;
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}
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Biquad::~Biquad() {
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}
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void Biquad::setType(int type) {
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this->type = type;
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calcBiquad();
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}
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void Biquad::setQ(double Q) {
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this->Q = Q;
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calcBiquad();
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}
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void Biquad::setFc(double Fc) {
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this->Fc = Fc;
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calcBiquad();
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}
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void Biquad::setPeakGain(double peakGainDB) {
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this->peakGain = peakGainDB;
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calcBiquad();
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}
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void Biquad::setBiquad(int type, double Fc, double Q, double peakGainDB) {
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this->type = type;
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this->Q = Q;
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this->Fc = Fc;
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setPeakGain(peakGainDB);
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}
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void Biquad::calcBiquad(void) {
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double norm;
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double V = pow(10, fabs(peakGain) / 20.0);
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double K = tan(M_PI * Fc);
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switch (this->type) {
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case bq_type_lowpass:
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norm = 1 / (1 + K / Q + K * K);
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a0 = K * K * norm;
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a1 = 2 * a0;
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a2 = a0;
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b1 = 2 * (K * K - 1) * norm;
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b2 = (1 - K / Q + K * K) * norm;
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break;
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case bq_type_highpass:
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norm = 1 / (1 + K / Q + K * K);
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a0 = 1 * norm;
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a1 = -2 * a0;
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a2 = a0;
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b1 = 2 * (K * K - 1) * norm;
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b2 = (1 - K / Q + K * K) * norm;
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break;
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case bq_type_bandpass:
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norm = 1 / (1 + K / Q + K * K);
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a0 = K / Q * norm;
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a1 = 0;
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a2 = -a0;
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b1 = 2 * (K * K - 1) * norm;
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b2 = (1 - K / Q + K * K) * norm;
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break;
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case bq_type_notch:
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norm = 1 / (1 + K / Q + K * K);
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a0 = (1 + K * K) * norm;
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a1 = 2 * (K * K - 1) * norm;
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a2 = a0;
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b1 = a1;
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b2 = (1 - K / Q + K * K) * norm;
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break;
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case bq_type_peak:
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if (peakGain >= 0) { // boost
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norm = 1 / (1 + 1/Q * K + K * K);
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a0 = (1 + V/Q * K + K * K) * norm;
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a1 = 2 * (K * K - 1) * norm;
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a2 = (1 - V/Q * K + K * K) * norm;
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b1 = a1;
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b2 = (1 - 1/Q * K + K * K) * norm;
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}
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else { // cut
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norm = 1 / (1 + V/Q * K + K * K);
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a0 = (1 + 1/Q * K + K * K) * norm;
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a1 = 2 * (K * K - 1) * norm;
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a2 = (1 - 1/Q * K + K * K) * norm;
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b1 = a1;
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b2 = (1 - V/Q * K + K * K) * norm;
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}
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break;
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case bq_type_lowshelf:
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if (peakGain >= 0) { // boost
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norm = 1 / (1 + sqrt(2) * K + K * K);
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a0 = (1 + sqrt(2*V) * K + V * K * K) * norm;
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a1 = 2 * (V * K * K - 1) * norm;
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a2 = (1 - sqrt(2*V) * K + V * K * K) * norm;
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b1 = 2 * (K * K - 1) * norm;
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b2 = (1 - sqrt(2) * K + K * K) * norm;
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}
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else { // cut
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norm = 1 / (1 + sqrt(2*V) * K + V * K * K);
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a0 = (1 + sqrt(2) * K + K * K) * norm;
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a1 = 2 * (K * K - 1) * norm;
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a2 = (1 - sqrt(2) * K + K * K) * norm;
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b1 = 2 * (V * K * K - 1) * norm;
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b2 = (1 - sqrt(2*V) * K + V * K * K) * norm;
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}
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break;
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case bq_type_highshelf:
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if (peakGain >= 0) { // boost
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norm = 1 / (1 + sqrt(2) * K + K * K);
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a0 = (V + sqrt(2*V) * K + K * K) * norm;
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a1 = 2 * (K * K - V) * norm;
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a2 = (V - sqrt(2*V) * K + K * K) * norm;
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b1 = 2 * (K * K - 1) * norm;
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b2 = (1 - sqrt(2) * K + K * K) * norm;
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}
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else { // cut
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norm = 1 / (V + sqrt(2*V) * K + K * K);
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a0 = (1 + sqrt(2) * K + K * K) * norm;
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a1 = 2 * (K * K - 1) * norm;
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a2 = (1 - sqrt(2) * K + K * K) * norm;
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b1 = 2 * (K * K - V) * norm;
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b2 = (V - sqrt(2*V) * K + K * K) * norm;
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}
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break;
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}
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return;
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}

‎plugins/Filter/Biquad.h‎

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//
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// Biquad.h
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//
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// Created by Nigel Redmon on 11/24/12
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// EarLevel Engineering: earlevel.com
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// Copyright 2012 Nigel Redmon
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//
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// For a complete explanation of the Biquad code:
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// http://www.earlevel.com/main/2012/11/26/biquad-c-source-code/
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//
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// License:
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//
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// This source code is provided as is, without warranty.
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// You may copy and distribute verbatim copies of this document.
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// You may modify and use this source code to create binary code
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// for your own purposes, free or commercial.
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//
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#ifndef Biquad_h
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#define Biquad_h
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enum {
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bq_type_lowpass = 0,
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bq_type_highpass,
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bq_type_bandpass,
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bq_type_notch,
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bq_type_peak,
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bq_type_lowshelf,
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bq_type_highshelf
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};
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class Biquad {
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public:
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Biquad();
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Biquad(int type, double Fc, double Q, double peakGainDB);
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~Biquad();
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void setType(int type);
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void setQ(double Q);
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void setFc(double Fc);
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void setPeakGain(double peakGainDB);
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void setBiquad(int type, double Fc, double Q, double peakGainDB);
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float process(float in);
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protected:
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void calcBiquad(void);
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int type;
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double a0, a1, a2, b1, b2;
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double Fc, Q, peakGain;
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double z1, z2;
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};
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inline float Biquad::process(float in) {
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double out = in * a0 + z1;
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z1 = in * a1 + z2 - b1 * out;
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z2 = in * a2 - b2 * out;
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return out;
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}
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#endif // Biquad_h

‎plugins/Filter/DistrhoPluginInfo.h‎

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/*
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* DISTRHO OneKnob Filter
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* Copyright (C) 2023 Filipe Coelho <falktx@falktx.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* For a full copy of the GNU General Public License see the LICENSE file.
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*/
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#pragma once
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#include "OneKnobPluginInfo.h"
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#include "Biquad.h"
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#define DISTRHO_PLUGIN_NAME "OneKnob Filter"
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#define DISTRHO_PLUGIN_URI "https://distrho.kx.studio/plugins/oneknob#Filter"
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#define DISTRHO_PLUGIN_CLAP_ID "studio.kx.distrho.oneknob.Filter"
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#define DISTRHO_PLUGIN_CLAP_FEATURES "audio-effect", "filter", "stereo"
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#define DISTRHO_PLUGIN_LV2_CATEGORY "lv2:FilterPlugin"
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#define DISTRHO_PLUGIN_VST3_CATEGORIES "Fx|Filter|Stereo"
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#ifdef __MOD_DEVICES__
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#undef DISTRHO_PLUGIN_NUM_INPUTS
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#undef DISTRHO_PLUGIN_NUM_OUTPUTS
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#define DISTRHO_PLUGIN_NUM_INPUTS 1
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#define DISTRHO_PLUGIN_NUM_OUTPUTS 1
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#endif
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enum Parameters {
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kParameterType = 0,
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kParameterFrequency,
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kParameterQ,
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kParameterGain,
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kParameterBypass,
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kParameterCount
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};
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enum Programs {
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kProgramDefault,
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kProgramCount
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};
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enum States {
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kStateCount
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};
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static constexpr const struct OneKnobParameterRanges {
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float min, def, max;
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} kParameterRanges[kParameterCount] = {
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{ bq_type_lowpass, bq_type_lowpass, bq_type_highshelf },
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{ 20.f, 5000.f, 20000.f },
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{ 0.f, 0.707f, 1.f },
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{ -20.f, 0.f, 20.f },
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{}
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};

‎plugins/Filter/Makefile‎

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#!/usr/bin/make -f
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# Makefile for DISTRHO Plugins #
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# ---------------------------- #
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# Created by falkTX
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#
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# --------------------------------------------------------------
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# Project name, used for binaries
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NAME = OK-Filter
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# --------------------------------------------------------------
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# Files to build
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FILES_DSP = \
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OneKnobPlugin.cpp \
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Biquad.cpp
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# --------------------------------------------------------------
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# Do some magic
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include ../../dpf/Makefile.plugins.mk
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BUILD_CXX_FLAGS += -I../common
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BUILD_CXX_FLAGS += -I../../dpf-widgets/opengl
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LINK_FLAGS += $(SHARED_MEMORY_LIBS)
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# --------------------------------------------------------------
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# Enable all possible plugin types
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TARGETS += lv2_sep
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all: $(TARGETS)
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# --------------------------------------------------------------

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