281 lines
8.2 KiB
C++
281 lines
8.2 KiB
C++
#pragma once
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#include <cstdlib>
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#include <stdint.h>
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#include <cmath>
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namespace trnr {
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// compressor based on pop2 by Chris Johnson
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class aw_pop2 {
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public:
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aw_pop2()
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{
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samplerate = 44100;
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A = 0.5;
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B = 0.5;
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C = 0.5;
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D = 0.5;
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E = 1.0;
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fpdL = 1.0;
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while (fpdL < 16386) fpdL = rand() * UINT32_MAX;
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fpdR = 1.0;
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while (fpdR < 16386) fpdR = rand() * UINT32_MAX;
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lastSampleL = 0.0;
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wasPosClipL = false;
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wasNegClipL = false;
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lastSampleR = 0.0;
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wasPosClipR = false;
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wasNegClipR = false;
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for (int x = 0; x < 16; x++) {
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intermediateL[x] = 0.0;
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intermediateR[x] = 0.0;
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}
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muVaryL = 0.0;
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muAttackL = 0.0;
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muNewSpeedL = 1000.0;
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muSpeedAL = 1000.0;
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muSpeedBL = 1000.0;
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muCoefficientAL = 1.0;
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muCoefficientBL = 1.0;
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muVaryR = 0.0;
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muAttackR = 0.0;
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muNewSpeedR = 1000.0;
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muSpeedAR = 1000.0;
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muSpeedBR = 1000.0;
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muCoefficientAR = 1.0;
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muCoefficientBR = 1.0;
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flip = false;
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// this is reset: values being initialized only once. Startup values, whatever they are.
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}
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void set_compression(double value) { A = clamp(value); }
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void set_attack(double value) { B = clamp(value); }
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void set_release(double value) { C = clamp(value); }
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void set_drive(double value) { D = clamp(value); }
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void set_drywet(double value) { E = clamp(value); }
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void set_samplerate(double _samplerate) { samplerate = _samplerate; }
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template <typename t_sample>
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void process_block(t_sample** inputs, t_sample** outputs, long sampleframes)
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{
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t_sample* in1 = inputs[0];
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t_sample* in2 = inputs[1];
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t_sample* out1 = outputs[0];
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t_sample* out2 = outputs[1];
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double overallscale = 1.0;
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overallscale /= 44100.0;
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overallscale *= samplerate;
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int spacing = floor(overallscale); // should give us working basic scaling, usually 2 or 4
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if (spacing < 1) spacing = 1;
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if (spacing > 16) spacing = 16;
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double threshold = 1.0 - ((1.0 - pow(1.0 - A, 2)) * 0.9);
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double attack = ((pow(B, 4) * 100000.0) + 10.0) * overallscale;
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double release = ((pow(C, 5) * 2000000.0) + 20.0) * overallscale;
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double maxRelease = release * 4.0;
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double muPreGain = 1.0 / threshold;
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double muMakeupGain = sqrt(1.0 / threshold) * D;
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double wet = E;
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// compressor section
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while (--sampleframes >= 0) {
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double inputSampleL = *in1;
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double inputSampleR = *in2;
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if (fabs(inputSampleL) < 1.18e-23) inputSampleL = fpdL * 1.18e-17;
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if (fabs(inputSampleR) < 1.18e-23) inputSampleR = fpdR * 1.18e-17;
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double drySampleL = inputSampleL;
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double drySampleR = inputSampleR;
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// begin compressor section
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inputSampleL *= muPreGain;
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inputSampleR *= muPreGain;
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// adjust coefficients for L
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if (flip) {
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if (fabs(inputSampleL) > threshold) {
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muVaryL = threshold / fabs(inputSampleL);
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muAttackL = sqrt(fabs(muSpeedAL));
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muCoefficientAL = muCoefficientAL * (muAttackL - 1.0);
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if (muVaryL < threshold) muCoefficientAL = muCoefficientAL + threshold;
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else muCoefficientAL = muCoefficientAL + muVaryL;
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muCoefficientAL = muCoefficientAL / muAttackL;
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muNewSpeedL = muSpeedAL * (muSpeedAL - 1.0);
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muNewSpeedL = muNewSpeedL + release;
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muSpeedAL = muNewSpeedL / muSpeedAL;
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if (muSpeedAL > maxRelease) muSpeedAL = maxRelease;
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} else {
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muCoefficientAL = muCoefficientAL * ((muSpeedAL * muSpeedAL) - 1.0);
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muCoefficientAL = muCoefficientAL + 1.0;
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muCoefficientAL = muCoefficientAL / (muSpeedAL * muSpeedAL);
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muNewSpeedL = muSpeedAL * (muSpeedAL - 1.0);
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muNewSpeedL = muNewSpeedL + attack;
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muSpeedAL = muNewSpeedL / muSpeedAL;
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}
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} else {
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if (fabs(inputSampleL) > threshold) {
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muVaryL = threshold / fabs(inputSampleL);
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muAttackL = sqrt(fabs(muSpeedBL));
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muCoefficientBL = muCoefficientBL * (muAttackL - 1);
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if (muVaryL < threshold) muCoefficientBL = muCoefficientBL + threshold;
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else muCoefficientBL = muCoefficientBL + muVaryL;
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muCoefficientBL = muCoefficientBL / muAttackL;
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muNewSpeedL = muSpeedBL * (muSpeedBL - 1.0);
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muNewSpeedL = muNewSpeedL + release;
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muSpeedBL = muNewSpeedL / muSpeedBL;
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if (muSpeedBL > maxRelease) muSpeedBL = maxRelease;
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} else {
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muCoefficientBL = muCoefficientBL * ((muSpeedBL * muSpeedBL) - 1.0);
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muCoefficientBL = muCoefficientBL + 1.0;
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muCoefficientBL = muCoefficientBL / (muSpeedBL * muSpeedBL);
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muNewSpeedL = muSpeedBL * (muSpeedBL - 1.0);
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muNewSpeedL = muNewSpeedL + attack;
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muSpeedBL = muNewSpeedL / muSpeedBL;
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}
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}
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// got coefficients, adjusted speeds for L
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// adjust coefficients for R
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if (flip) {
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if (fabs(inputSampleR) > threshold) {
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muVaryR = threshold / fabs(inputSampleR);
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muAttackR = sqrt(fabs(muSpeedAR));
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muCoefficientAR = muCoefficientAR * (muAttackR - 1.0);
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if (muVaryR < threshold) muCoefficientAR = muCoefficientAR + threshold;
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else muCoefficientAR = muCoefficientAR + muVaryR;
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muCoefficientAR = muCoefficientAR / muAttackR;
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muNewSpeedR = muSpeedAR * (muSpeedAR - 1.0);
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muNewSpeedR = muNewSpeedR + release;
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muSpeedAR = muNewSpeedR / muSpeedAR;
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if (muSpeedAR > maxRelease) muSpeedAR = maxRelease;
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} else {
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muCoefficientAR = muCoefficientAR * ((muSpeedAR * muSpeedAR) - 1.0);
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muCoefficientAR = muCoefficientAR + 1.0;
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muCoefficientAR = muCoefficientAR / (muSpeedAR * muSpeedAR);
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muNewSpeedR = muSpeedAR * (muSpeedAR - 1.0);
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muNewSpeedR = muNewSpeedR + attack;
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muSpeedAR = muNewSpeedR / muSpeedAR;
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}
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} else {
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if (fabs(inputSampleR) > threshold) {
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muVaryR = threshold / fabs(inputSampleR);
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muAttackR = sqrt(fabs(muSpeedBR));
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muCoefficientBR = muCoefficientBR * (muAttackR - 1);
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if (muVaryR < threshold) muCoefficientBR = muCoefficientBR + threshold;
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else muCoefficientBR = muCoefficientBR + muVaryR;
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muCoefficientBR = muCoefficientBR / muAttackR;
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muNewSpeedR = muSpeedBR * (muSpeedBR - 1.0);
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muNewSpeedR = muNewSpeedR + release;
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muSpeedBR = muNewSpeedR / muSpeedBR;
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if (muSpeedBR > maxRelease) muSpeedBR = maxRelease;
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} else {
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muCoefficientBR = muCoefficientBR * ((muSpeedBR * muSpeedBR) - 1.0);
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muCoefficientBR = muCoefficientBR + 1.0;
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muCoefficientBR = muCoefficientBR / (muSpeedBR * muSpeedBR);
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muNewSpeedR = muSpeedBR * (muSpeedBR - 1.0);
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muNewSpeedR = muNewSpeedR + attack;
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muSpeedBR = muNewSpeedR / muSpeedBR;
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}
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}
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// got coefficients, adjusted speeds for R
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if (flip) {
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inputSampleL *= pow(muCoefficientAL, 2);
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inputSampleR *= pow(muCoefficientAR, 2);
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} else {
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inputSampleL *= pow(muCoefficientBL, 2);
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inputSampleR *= pow(muCoefficientBR, 2);
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}
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inputSampleL *= muMakeupGain;
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inputSampleR *= muMakeupGain;
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flip = !flip;
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// end compressor section
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if (wet < 1.0) {
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inputSampleL = (drySampleL * (1.0 - wet)) + (inputSampleL * wet);
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inputSampleR = (drySampleR * (1.0 - wet)) + (inputSampleR * wet);
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}
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// begin 64 bit stereo floating point dither
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// int expon; frexp((double)inputSampleL, &expon);
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fpdL ^= fpdL << 13;
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fpdL ^= fpdL >> 17;
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fpdL ^= fpdL << 5;
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// inputSampleL += ((double(fpdL)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
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// frexp((double)inputSampleR, &expon);
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fpdR ^= fpdR << 13;
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fpdR ^= fpdR >> 17;
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fpdR ^= fpdR << 5;
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// inputSampleR += ((double(fpdR)-uint32_t(0x7fffffff)) * 1.1e-44l * pow(2,expon+62));
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// end 64 bit stereo floating point dither
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*out1 = inputSampleL;
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*out2 = inputSampleR;
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in1++;
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in2++;
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out1++;
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out2++;
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}
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}
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private:
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double samplerate;
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uint32_t fpdL;
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uint32_t fpdR;
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// default stuff
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double muVaryL;
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double muAttackL;
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double muNewSpeedL;
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double muSpeedAL;
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double muSpeedBL;
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double muCoefficientAL;
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double muCoefficientBL;
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double muVaryR;
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double muAttackR;
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double muNewSpeedR;
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double muSpeedAR;
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double muSpeedBR;
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double muCoefficientAR;
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double muCoefficientBR;
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bool flip;
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double lastSampleL;
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double intermediateL[16];
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bool wasPosClipL;
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bool wasNegClipL;
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double lastSampleR;
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double intermediateR[16];
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bool wasPosClipR;
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bool wasNegClipR; // Stereo ClipOnly2
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float A;
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float B;
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float C;
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float D;
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float E; // parameters. Always 0-1, and we scale/alter them elsewhere.
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double clamp(double& value)
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{
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if (value > 1) {
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value = 1;
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} else if (value < 0) {
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value = 0;
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}
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return value;
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}
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};
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} // namespace trnr
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