312 lines
13 KiB
C++
312 lines
13 KiB
C++
#pragma once
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#include <cstdlib>
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#include <stdint.h>
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namespace trnr::lib::dynamics {
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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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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; while (fpdL < 16386) fpdL = rand()*UINT32_MAX;
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fpdR = 1.0; 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++) {intermediateL[x] = 0.0; intermediateR[x] = 0.0;}
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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) {
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A = clamp(value);
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}
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void set_attack(double value) {
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B = clamp(value);
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}
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void set_release(double value) {
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C = clamp(value);
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}
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void set_drive(double value) {
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D = clamp(value);
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}
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void set_drywet(double value) {
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E = clamp(value);
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}
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void set_samplerate(double _samplerate) {
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samplerate = _samplerate;
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}
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void process_block(double **inputs, double **outputs, long sampleframes) {
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double* in1 = inputs[0];
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double* in2 = inputs[1];
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double* out1 = outputs[0];
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double* 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; 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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{
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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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} 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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//begin ClipOnly2 stereo as a little, compressed chunk that can be dropped into code
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if (inputSampleL > 4.0) inputSampleL = 4.0; if (inputSampleL < -4.0) inputSampleL = -4.0;
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if (wasPosClipL == true) { //current will be over
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if (inputSampleL<lastSampleL) lastSampleL=0.7058208+(inputSampleL*0.2609148);
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else lastSampleL = 0.2491717+(lastSampleL*0.7390851);
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} wasPosClipL = false;
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if (inputSampleL>0.9549925859) {wasPosClipL=true;inputSampleL=0.7058208+(lastSampleL*0.2609148);}
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if (wasNegClipL == true) { //current will be -over
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if (inputSampleL > lastSampleL) lastSampleL=-0.7058208+(inputSampleL*0.2609148);
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else lastSampleL=-0.2491717+(lastSampleL*0.7390851);
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} wasNegClipL = false;
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if (inputSampleL<-0.9549925859) {wasNegClipL=true;inputSampleL=-0.7058208+(lastSampleL*0.2609148);}
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intermediateL[spacing] = inputSampleL;
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inputSampleL = lastSampleL; //Latency is however many samples equals one 44.1k sample
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for (int x = spacing; x > 0; x--) intermediateL[x-1] = intermediateL[x];
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lastSampleL = intermediateL[0]; //run a little buffer to handle this
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if (inputSampleR > 4.0) inputSampleR = 4.0; if (inputSampleR < -4.0) inputSampleR = -4.0;
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if (wasPosClipR == true) { //current will be over
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if (inputSampleR<lastSampleR) lastSampleR=0.7058208+(inputSampleR*0.2609148);
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else lastSampleR = 0.2491717+(lastSampleR*0.7390851);
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} wasPosClipR = false;
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if (inputSampleR>0.9549925859) {wasPosClipR=true;inputSampleR=0.7058208+(lastSampleR*0.2609148);}
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if (wasNegClipR == true) { //current will be -over
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if (inputSampleR > lastSampleR) lastSampleR=-0.7058208+(inputSampleR*0.2609148);
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else lastSampleR=-0.2491717+(lastSampleR*0.7390851);
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} wasNegClipR = false;
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if (inputSampleR<-0.9549925859) {wasNegClipR=true;inputSampleR=-0.7058208+(lastSampleR*0.2609148);}
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intermediateR[spacing] = inputSampleR;
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inputSampleR = lastSampleR; //Latency is however many samples equals one 44.1k sample
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for (int x = spacing; x > 0; x--) intermediateR[x-1] = intermediateR[x];
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lastSampleR = intermediateR[0]; //run a little buffer to handle this
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//end ClipOnly2 stereo as a little, compressed chunk that can be dropped into code
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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; fpdL ^= fpdL >> 17; 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; fpdR ^= fpdR >> 17; 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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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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} |