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MultiBiquad

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This commit is contained in:
Martijn
2021-07-27 17:41:38 +02:00
parent bbcdf238a9
commit c5534cf59f
9 changed files with 181 additions and 11 deletions
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2
src/utils/CAllpassFilter.cpp
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@ -13,7 +13,7 @@ CAllpassFilter::CAllpassFilter() {
}
void CAllpassFilter::Mute() {
memset(this->buffer, 0, this->bufsize * sizeof(float))
memset(this->buffer, 0, this->bufsize * sizeof(float));
}
float CAllpassFilter::Process(float sample) {

2
src/utils/Crossfeed.cpp
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@ -50,7 +50,7 @@ void Crossfeed::Reset() {
void Crossfeed::ProcessFrames(float* buffer, uint32_t size) {
for (int x = 0; x < size; x+=2) {
FilterSample(&buffer[x])
FilterSample(&buffer[x]);
}
}

2
src/utils/FixedBiquad.cpp
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@ -69,7 +69,7 @@ void FixedBiquad::SetHighPassParameter(float frequency, uint32_t samplerate, flo
fVar9 + fVar9,
fVar11 - (fVar7 + fVar7) * fVar6,
(fVar12 + (fVar7 + fVar7) * fVar6) * x * fVar2,
x * -2.0 * (fVar8 + fVar10 * fVar5) * fVar2,
x * -2.f * (fVar8 + fVar10 * fVar5) * fVar2,
(fVar12 - (fVar7 + fVar7) * fVar6) * x * fVar2);
}

2
src/utils/IIR_1st.cpp
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@ -12,7 +12,7 @@ IIR_1st::IIR_1st() {
this->b0 = 0.f;
this->b1 = 0.f;
this->a1 = 0.f;
Mute()
Mute();
}

119
src/utils/MultiBiquad.cpp
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@ -2,6 +2,7 @@
// Created by mart on 7/27/21.
//
#include <cmath>
#include "MultiBiquad.h"
MultiBiquad::MultiBiquad() {
@ -26,7 +27,123 @@ float MultiBiquad::ProcessSample(float sample) {
}
void MultiBiquad::RefreshFilter(FilterType type, float gainAmp, float freq, float samplerate, float qFactor, bool param_7) {
// TODO
bool uVar1;
int iVar2;
int iVar3;
double dVar4;
double dVar5;
double dVar6;
double dVar7;
double dVar8;
double dVar9;
double dVar10;
double dVar11;
double a0;
double a1;
double a2;
double b0;
double b1;
double b2;
dVar10 = pow(10.0,gainAmp / 40.0);
dVar4 = (freq * 2*M_PI) / samplerate;
dVar5 = sin(dVar4);
dVar11 = cos(dVar4);
uVar1 = type == HIGHSHELF;
dVar4 = (1.0 / dVar10 + dVar10) * (1.0 / qFactor - 1.0) + 2.0;
dVar6 = sqrt(dVar4);
if (!(bool)uVar1) {
dVar4 = sinh(dVar4);
dVar6 = dVar4;
}
dVar4 = sqrt(dVar10);
dVar5 = dVar5 * 0.5 * dVar6;
if (!(bool)uVar1) {
dVar4 = sinh(dVar10);
}
dVar4 = (dVar4 + dVar4) * dVar5;
switch(type) {
case LOWPASS:
b1 = 1.0 - dVar11;
dVar10 = b1;
b0 = dVar10 * 0.5;
a0 = dVar5 + 1.0;
a1 = dVar11 * -2.0;
a2 = 1.0 - dVar5;
b2 = b0;
break;
case HIGHPASS:
b1 = 0.0 - (dVar11 + 1.0);
dVar10 = dVar11 + 1.0;
b0 = dVar10 * 0.5;
a0 = dVar5 + 1.0;
a1 = dVar11 * -2.0;
a2 = 1.0 - dVar5;
b2 = b0;
break;
case BANDPASS:
a1 = dVar11 * -2.0;
a2 = 1.0 - dVar5;
a0 = dVar5 + 1.0;
b1 = 0.0;
b0 = dVar5;
b2 = 0.0 - dVar5;
break;
case BANDSTOP:
b1 = dVar11 * -2.0;
a2 = 1.0 - dVar5;
a0 = dVar5 + 1.0;
b0 = 1.0;
b2 = 1.0;
a1 = b1;
break;
case ALLPASS:
b1 = dVar11 * -2.0;
a2 = 1.0 - dVar5;
a0 = dVar5 + 1.0;
b0 = a2;
b2 = a0;
a1 = b1;
break;
case PEAK:
b1 = dVar11 * -2.0;
a2 = 1.0 - dVar5 / dVar10;
a0 = dVar5 / dVar10 + 1.0;
b0 = dVar5 * dVar10 + 1.0;
b2 = 1.0 - dVar5 * dVar10;
a1 = b1;
break;
case LOWSHELF:
dVar6 = dVar10 - 1.0;
dVar7 = dVar10 + 1.0;
dVar5 = dVar7 - dVar6 * dVar11;
dVar8 = dVar7 + dVar6 * dVar11;
a0 = dVar8 + dVar4;
b1 = (dVar10 + dVar10) * (dVar6 - dVar11 * dVar7);
a2 = dVar8 - dVar4;
a1 = (dVar6 + dVar11 * dVar7) * -2.0;
b0 = (dVar5 + dVar4) * dVar10;
b2 = (dVar5 - dVar4) * dVar10;
break;
case HIGHSHELF:
dVar6 = dVar10 - 1.0;
dVar8 = dVar10 + 1.0;
dVar5 = dVar8 + dVar6 * dVar11;
dVar9 = dVar8 - dVar6 * dVar11;
dVar7 = dVar6 - dVar11 * dVar8;
a0 = dVar9 + dVar4;
b1 = dVar10 * -2.0 * (dVar6 + dVar11 * dVar8);
a2 = dVar9 - dVar4;
a1 = dVar7 + dVar7;
b0 = (dVar5 + dVar4) * dVar10;
b2 = (dVar5 - dVar4) * dVar10;
}
this->a1 = a1 / a0;
this->a2 = a2 / a0;
this->b0 = b0 / a0;
this->b1 = b1 / a0;
this->b2 = b2 / a0;
this->y_2 = 0.f;
this->y_1 = 0.f;

9
src/utils/MultiBiquad.h
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@ -6,7 +6,14 @@
enum FilterType {
LOWPASS,
HIGHPASS,
BANDPASS,
BANDSTOP,
ALLPASS,
PEAK,
LOWSHELF,
HIGHSHELF
};