Update

CMakeLists.txt

@@ -45,6 +45,7 @@ set(FILES
 
         # Utils
         src/cpp/viper/utils/AdaptiveBuffer.cpp
+        src/cpp/viper/utils/Biquad.cpp
         src/cpp/viper/utils/CAllpassFilter.cpp
         src/cpp/viper/utils/CCombFilter.cpp
         src/cpp/viper/utils/CRevModel.cpp
@@ -52,13 +53,13 @@ set(FILES
         src/cpp/viper/utils/DepthSurround.cpp
         src/cpp/viper/utils/DynamicBass.cpp
         src/cpp/viper/utils/FIR.cpp
-        src/cpp/viper/utils/Biquad.cpp
         src/cpp/viper/utils/Harmonic.cpp
         src/cpp/viper/utils/HiFi.cpp
         src/cpp/viper/utils/HighShelf.cpp
         src/cpp/viper/utils/IIR_1st.cpp
         src/cpp/viper/utils/IIR_NOrder_BW_BP.cpp
         src/cpp/viper/utils/IIR_NOrder_BW_LH.cpp
+        src/cpp/viper/utils/MinPhaseIIRCoeffs.cpp
         src/cpp/viper/utils/MultiBiquad.cpp
         src/cpp/viper/utils/NoiseSharpening.cpp
         src/cpp/viper/utils/PassFilter.cpp

src/cpp/viper/effects/AnalogX.cpp

@@ -48,11 +48,11 @@ void AnalogX::Process(float *samples, uint32_t size) {
 
 void AnalogX::Reset() {
     for (auto &highpass : this->highpass) {
-        highpass.RefreshFilter(FilterType::HIGHPASS, 0.0f, 240.0f, (float) this->samplingRate, 0.717f, false);
+        highpass.RefreshFilter(MultiBiquad::FilterType::HIGHPASS, 0.0f, 240.0f, (float) this->samplingRate, 0.717f, false);
     }
 
     for (auto &peak : this->peak) {
-        peak.RefreshFilter(FilterType::PEAK, 0.58f, 633.0f, (float) this->samplingRate, 6.28f, true);
+        peak.RefreshFilter(MultiBiquad::FilterType::PEAK, 0.58f, 633.0f, (float) this->samplingRate, 6.28f, true);
     }
 
     for (auto &harmonic : this->harmonic) {
@@ -67,7 +67,7 @@ void AnalogX::Reset() {
         this->gain = 0.6f;
 
         for (auto &lowpass : this->lowpass) {
-            lowpass.RefreshFilter(FilterType::LOWPASS, 0.0f, 19650.0f, (float) this->samplingRate, 0.717f, false);
+            lowpass.RefreshFilter(MultiBiquad::FilterType::LOWPASS, 0.0f, 19650.0f, (float) this->samplingRate, 0.717f, false);
         }
     } else if (this->processingModel == 1) {
         for (auto &harmonic : this->harmonic) {
@@ -77,7 +77,7 @@ void AnalogX::Reset() {
         this->gain = 1.2f;
 
         for (auto &lowpass : this->lowpass) {
-            lowpass.RefreshFilter(FilterType::LOWPASS, 0.0f, 18233.0f, (float) this->samplingRate, 0.717f, false);
+            lowpass.RefreshFilter(MultiBiquad::FilterType::LOWPASS, 0.0f, 18233.0f, (float) this->samplingRate, 0.717f, false);
         }
     } else if (this->processingModel == 2) {
         for (auto &harmonic : this->harmonic) {
@@ -87,7 +87,7 @@ void AnalogX::Reset() {
         this->gain = 2.4f;
 
         for (auto &lowpass : this->lowpass) {
-            lowpass.RefreshFilter(FilterType::LOWPASS, 0.0f, 16307.0f, (float) this->samplingRate, 0.717f, false);
+            lowpass.RefreshFilter(MultiBiquad::FilterType::LOWPASS, 0.0f, 16307.0f, (float) this->samplingRate, 0.717f, false);
         }
     }
 

src/cpp/viper/effects/Cure.cpp

@@ -30,9 +30,9 @@ void Cure::SetEnable(bool enabled) {
     }
 }
 
-void Cure::SetSamplingRate(uint32_t samplerate) {
-    this->crossfeed.SetSamplingRate(samplerate);
-    this->pass.SetSamplingRate(samplerate);
+void Cure::SetSamplingRate(uint32_t samplingRate) {
+    this->crossfeed.SetSamplingRate(samplingRate);
+    this->pass.SetSamplingRate(samplingRate);
 }
 
 uint16_t Cure::GetCutoff() {
@@ -47,7 +47,7 @@ float Cure::GetLevelDelay() {
     return this->crossfeed.GetLevelDelay();
 }
 
-preset_t Cure::GetPreset() {
+struct Crossfeed::Preset Cure::GetPreset() {
     return this->crossfeed.GetPreset();
 }
 
@@ -59,7 +59,7 @@ void Cure::SetFeedback(float feedback) {
     this->crossfeed.SetFeedback(feedback);
 }
 
-void Cure::SetPreset(preset_t preset) {
+void Cure::SetPreset(struct Crossfeed::Preset preset) {
     this->crossfeed.SetPreset(preset);
 }
 

src/cpp/viper/effects/Cure.h

@@ -12,14 +12,14 @@ public:
     uint16_t GetCutoff();
     float GetFeedback();
     float GetLevelDelay();
-    preset_t GetPreset();
+    struct Crossfeed::Preset GetPreset();
     void Process(float *buffer, uint32_t size);
     void Reset();
     void SetCutoff(uint16_t cutoff);
     void SetEnable(bool enabled);
     void SetFeedback(float feedback);
-    void SetPreset(preset_t preset);
-    void SetSamplingRate(uint32_t samplerate);
+    void SetPreset(struct Crossfeed::Preset preset);
+    void SetSamplingRate(uint32_t samplingRate);
 
     Crossfeed crossfeed;
     PassFilter pass;

src/cpp/viper/effects/DiffSurround.cpp

@@ -3,7 +3,7 @@
 #include "../constants.h"
 
 DiffSurround::DiffSurround() {
-    this->samplerate = DEFAULT_SAMPLERATE;
+    this->samplingRate = DEFAULT_SAMPLERATE;
     this->delayTime = 0.0f;
     this->enabled = false;
     for (auto &buffer : this->buffers) {
@@ -46,7 +46,7 @@ void DiffSurround::Reset() {
         buffer->Reset();
     }
 
-    this->buffers[1]->PushZeros((uint32_t) (this->delayTime / 1000.0f * (float) this->samplerate));
+    this->buffers[1]->PushZeros((uint32_t) (this->delayTime / 1000.0f * (float) this->samplingRate));
 }
 
 void DiffSurround::SetDelayTime(float delayTime) {
@@ -65,9 +65,9 @@ void DiffSurround::SetEnable(bool enabled) {
     }
 }
 
-void DiffSurround::SetSamplingRate(uint32_t samplerate) {
-    if (this->samplerate != samplerate) {
-        this->samplerate = samplerate;
+void DiffSurround::SetSamplingRate(uint32_t samplingRate) {
+    if (this->samplingRate != samplingRate) {
+        this->samplingRate = samplingRate;
         this->Reset();
     }
 }

src/cpp/viper/effects/DiffSurround.h

@@ -12,9 +12,9 @@ public:
     void Reset();
     void SetDelayTime(float delayTime);
     void SetEnable(bool enabled);
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
 
-    uint32_t samplerate;
+    uint32_t samplingRate;
     bool enabled;
     float delayTime;
     WaveBuffer *buffers[2];

src/cpp/viper/effects/DynamicSystem.cpp

@@ -3,8 +3,8 @@
 
 DynamicSystem::DynamicSystem() {
     this->enabled = false;
-    this->samplerate = DEFAULT_SAMPLERATE;
-    this->bass.SetSamplingRate(this->samplerate);
+    this->samplingRate = DEFAULT_SAMPLERATE;
+    this->bass.SetSamplingRate(this->samplingRate);
     this->bass.Reset();
 }
 
@@ -15,7 +15,7 @@ void DynamicSystem::Process(float *samples, uint32_t size) {
 }
 
 void DynamicSystem::Reset() {
-    this->bass.SetSamplingRate(this->samplerate);
+    this->bass.SetSamplingRate(this->samplingRate);
     this->bass.Reset();
 }
 
@@ -44,10 +44,10 @@ void DynamicSystem::SetYCoeffs(uint32_t low, uint32_t high) {
     this->bass.SetFilterYPassFrequency(low, high);
 }
 
-void DynamicSystem::SetSamplingRate(uint32_t samplerate) {
-    if (this->samplerate != samplerate) {
-        this->samplerate = samplerate;
-        this->bass.SetSamplingRate(samplerate);
+void DynamicSystem::SetSamplingRate(uint32_t samplingRate) {
+    if (this->samplingRate != samplingRate) {
+        this->samplingRate = samplingRate;
+        this->bass.SetSamplingRate(samplingRate);
     }
 }
 

src/cpp/viper/effects/DynamicSystem.h

@@ -12,13 +12,13 @@ public:
     void Reset();
     void SetBassGain(float gain);
     void SetEnable(bool enable);
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
     void SetSideGain(float gainX, float gainY);
     void SetXCoeffs(uint32_t low, uint32_t high);
     void SetYCoeffs(uint32_t low, uint32_t high);
 
     DynamicBass bass;
-    uint32_t samplerate;
+    uint32_t samplingRate;
     bool enabled;
 };
 

src/cpp/viper/effects/Reverberation.cpp

@@ -14,7 +14,7 @@ Reverberation::Reverberation() {
     this->model.SetWet(0.f);
     this->model.SetDry(0.5f);
 
-    this->samplerate = DEFAULT_SAMPLERATE;
+    this->samplingRate = DEFAULT_SAMPLERATE;
     this->enabled = false;
 }
 
@@ -61,7 +61,7 @@ void Reverberation::SetWidth(float value) {
 }
 
 void Reverberation::SetSamplingRate(uint32_t value) {
-    this->samplerate = value;
+    this->samplingRate = value;
     this->model.Reset();
 }
 

src/cpp/viper/effects/Reverberation.h

@@ -24,7 +24,7 @@ public:
     float wet;
     float dry;
     CRevModel model;
-    uint32_t samplerate;
+    uint32_t samplingRate;
     bool enabled;
 };
 

src/cpp/viper/effects/SpeakerCorrection.cpp

@@ -2,7 +2,7 @@
 #include "../constants.h"
 
 SpeakerCorrection::SpeakerCorrection() {
-    this->samplerate = DEFAULT_SAMPLERATE;
+    this->samplingRate = DEFAULT_SAMPLERATE;
     this->enabled = false;
     Reset();
 }
@@ -24,12 +24,12 @@ void SpeakerCorrection::Reset() {
     this->bandpass[0].Reset();
     this->bandpass[1].Reset();
 
-    this->highpass[0].RefreshFilter(FilterType::HIGHPASS, 0.f, 80.f, (float) this->samplerate, 1.f, false);
-    this->highpass[1].RefreshFilter(FilterType::HIGHPASS, 0.f, 80.f, (float) this->samplerate, 1.f, false);
-    this->lowpass[0].SetLowPassParameter(13500.f, this->samplerate, 1.0);
-    this->lowpass[1].SetLowPassParameter(13500.f, this->samplerate, 1.0);
-    this->bandpass[0].SetBandPassParameter(420.f, this->samplerate, 3.88f);
-    this->bandpass[1].SetBandPassParameter(420.f, this->samplerate, 3.88f);
+    this->highpass[0].RefreshFilter(MultiBiquad::FilterType::HIGHPASS, 0.f, 80.f, (float) this->samplingRate, 1.f, false);
+    this->highpass[1].RefreshFilter(MultiBiquad::FilterType::HIGHPASS, 0.f, 80.f, (float) this->samplingRate, 1.f, false);
+    this->lowpass[0].SetLowPassParameter(13500.f, this->samplingRate, 1.0);
+    this->lowpass[1].SetLowPassParameter(13500.f, this->samplingRate, 1.0);
+    this->bandpass[0].SetBandPassParameter(420.f, this->samplingRate, 3.88f);
+    this->bandpass[1].SetBandPassParameter(420.f, this->samplingRate, 3.88f);
 }
 
 void SpeakerCorrection::SetEnable(bool enabled) {
@@ -39,8 +39,8 @@ void SpeakerCorrection::SetEnable(bool enabled) {
     }
 }
 
-void SpeakerCorrection::SetSamplingRate(uint32_t samplerate) {
-    this->samplerate = samplerate;
+void SpeakerCorrection::SetSamplingRate(uint32_t samplingRate) {
+    this->samplingRate = samplingRate;
     Reset();
 }
 

src/cpp/viper/effects/SpeakerCorrection.h

@@ -12,9 +12,9 @@ public:
     void Process(float *samples, uint32_t size);
     void Reset();
     void SetEnable(bool enabled);
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
 
-    uint32_t samplerate;
+    uint32_t samplingRate;
     bool enabled;
     MultiBiquad highpass[2];
     Biquad lowpass[2];

src/cpp/viper/effects/SpectrumExtend.cpp

@@ -15,7 +15,7 @@ static float SPECTRUM_HARMONICS[10] = {
 };
 
 SpectrumExtend::SpectrumExtend() {
-    this->samplerate = DEFAULT_SAMPLERATE;
+    this->samplingRate = DEFAULT_SAMPLERATE;
     this->referenceFreq = 7600;
     this->enabled = false;
     this->exciter = 0.f;
@@ -38,14 +38,14 @@ void SpectrumExtend::Process(float *samples, uint32_t size) {
 }
 
 void SpectrumExtend::Reset() {
-    this->highpass[0].RefreshFilter(FilterType::HIGHPASS, 0.0, (float) this->referenceFreq, (float) this->samplerate,
+    this->highpass[0].RefreshFilter(MultiBiquad::FilterType::HIGHPASS, 0.0, (float) this->referenceFreq, (float) this->samplingRate,
                                     0.717, false);
-    this->highpass[1].RefreshFilter(FilterType::HIGHPASS, 0.0, (float) this->referenceFreq, (float) this->samplerate,
+    this->highpass[1].RefreshFilter(MultiBiquad::FilterType::HIGHPASS, 0.0, (float) this->referenceFreq, (float) this->samplingRate,
                                     0.717, false);
 
-    this->lowpass[0].RefreshFilter(FilterType::LOWPASS, 0.0, (float) this->referenceFreq / 2.f - 2000.f,
+    this->lowpass[0].RefreshFilter(MultiBiquad::FilterType::LOWPASS, 0.0, (float) this->referenceFreq / 2.f - 2000.f,
                                    (float) this->referenceFreq, 0.717, false);
-    this->lowpass[1].RefreshFilter(FilterType::LOWPASS, 0.0, (float) this->referenceFreq / 2.f - 2000.f,
+    this->lowpass[1].RefreshFilter(MultiBiquad::FilterType::LOWPASS, 0.0, (float) this->referenceFreq / 2.f - 2000.f,
                                    (float) this->referenceFreq, 0.717, false);
 
     this->harmonics[0].Reset();
@@ -64,17 +64,17 @@ void SpectrumExtend::SetExciter(float value) {
 }
 
 void SpectrumExtend::SetReferenceFrequency(uint32_t freq) {
-    if (this->samplerate / 2 - 100 < freq) {
-        freq = this->samplerate / 2 - 100;
+    if (this->samplingRate / 2 - 100 < freq) {
+        freq = this->samplingRate / 2 - 100;
     }
     this->referenceFreq = freq;
     Reset();
 }
 
-void SpectrumExtend::SetSamplingRate(uint32_t samplerate) {
-    this->samplerate = samplerate;
-    if (this->samplerate / 2 - 100 < this->referenceFreq) {
-        this->referenceFreq = this->samplerate / 2 - 100;
+void SpectrumExtend::SetSamplingRate(uint32_t samplingRate) {
+    this->samplingRate = samplingRate;
+    if (this->samplingRate / 2 - 100 < this->referenceFreq) {
+        this->referenceFreq = this->samplingRate / 2 - 100;
     }
     Reset();
 }

src/cpp/viper/effects/SpectrumExtend.h

@@ -14,13 +14,13 @@ public:
     void SetEnable(bool enable);
     void SetExciter(float value);
     void SetReferenceFrequency(uint32_t freq);
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
 
     MultiBiquad highpass[2];
     MultiBiquad lowpass[2];
     Harmonic harmonics[2];
     bool enabled;
-    uint32_t samplerate;
+    uint32_t samplingRate;
     uint32_t referenceFreq;
     float exciter;
 };

src/cpp/viper/effects/VHE.cpp

@@ -5,7 +5,7 @@ VHE::VHE() {
     enabled = false;
     effectLevel = 0;
     convSize = 0;
-    samplerate = DEFAULT_SAMPLERATE;
+    samplingRate = DEFAULT_SAMPLERATE;
 
     bufA = new WaveBuffer(2, 0x1000);
     bufB = new WaveBuffer(2, 0x1000);
@@ -55,6 +55,6 @@ void VHE::SetEnable(bool enabled) {
 }
 
 void VHE::SetSamplingRate(uint32_t srate) {
-    this->samplerate = srate;
+    this->samplingRate = srate;
     Reset();
 }

src/cpp/viper/effects/VHE.h

@@ -18,7 +18,7 @@ public:
 
     PConvSingle_F32 convLeft, convRight;
     WaveBuffer *bufA, *bufB;
-    uint32_t samplerate;
+    uint32_t samplingRate;
     bool enabled;
     int effectLevel;
     int convSize;

src/cpp/viper/utils/CAllpassFilter.cpp

@@ -3,9 +3,9 @@
 
 CAllpassFilter::CAllpassFilter() {
     this->buffer = nullptr;
-    this->bufidx = 0;
-    this->bufsize = 0;
-    this->feedback = 0;
+    this->feedback = 0.0;
+    this->bufferIndex = 0;
+    this->bufferSize = 0;
 }
 
 float CAllpassFilter::GetFeedback() {
@@ -13,22 +13,23 @@ float CAllpassFilter::GetFeedback() {
 }
 
 void CAllpassFilter::Mute() {
-    memset(this->buffer, 0, this->bufsize * sizeof(float));
+    memset(this->buffer, 0, this->bufferSize * sizeof(float));
 }
 
 float CAllpassFilter::Process(float sample) {
-    float outSample = this->buffer[this->bufidx];
-    this->buffer[this->bufidx] = sample + (outSample * this->feedback);
-    this->bufidx++;
-    if (this->bufidx >= this->bufsize) {
-        this->bufidx = 0;
+    float outSample = this->buffer[this->bufferIndex];
+    this->buffer[this->bufferIndex] = sample + outSample * this->feedback;
+    this->bufferIndex++;
+    if (this->bufferIndex >= this->bufferSize) {
+        this->bufferIndex = 0;
     }
     return outSample - sample;
 }
 
 void CAllpassFilter::SetBuffer(float *buffer, uint32_t size) {
     this->buffer = buffer;
-    this->bufsize = size;
+    this->bufferSize = size;
+    this->bufferIndex = 0;
 }
 
 void CAllpassFilter::SetFeedback(float feedback) {

src/cpp/viper/utils/CAllpassFilter.h

@@ -13,8 +13,8 @@ public:
     void SetFeedback(float feedback);
 
 private:
-    float *buffer;
-    uint32_t bufidx;
-    uint32_t bufsize;
     float feedback;
+    float *buffer;
+    uint32_t bufferSize;
+    uint32_t bufferIndex;
 };

src/cpp/viper/utils/CCombFilter.cpp

@@ -2,11 +2,11 @@
 #include <cstring>
 
 CCombFilter::CCombFilter() {
+    this->feedback = 0.0;
     this->buffer = nullptr;
-    this->size = 0;
-    this->bufidx = 0;
-    this->feedback = 0;
-    this->filterstore = 0;
+    this->bufferSize = 0;
+    this->bufferIndex = 0;
+    this->filterStore = 0.0;
     this->damp = 0;
     this->damp2 = 0;
 }
@@ -20,23 +20,24 @@ float CCombFilter::GetFeedback() {
 }
 
 void CCombFilter::Mute() {
-    memset(this->buffer, 0, this->size * sizeof(float));
+    memset(this->buffer, 0, this->bufferSize * sizeof(float));
 }
 
 float CCombFilter::Process(float sample) {
-    float output = this->buffer[this->bufidx];
-    this->filterstore = output * this->damp2 + this->filterstore * this->damp;
-    this->buffer[this->bufidx] = sample + this->filterstore * this->feedback;
-    this->bufidx++;
-    if (this->bufidx >= this->size) {
-        this->bufidx = 0;
+    float output = this->buffer[this->bufferIndex];
+    this->filterStore = output * this->damp2 + this->filterStore * this->damp;
+    this->buffer[this->bufferIndex] = sample + this->filterStore * this->feedback;
+    this->bufferIndex++;
+    if (this->bufferIndex >= this->bufferSize) {
+        this->bufferIndex = 0;
     }
     return output;
 }
 
 void CCombFilter::SetBuffer(float *buffer, uint32_t size) {
     this->buffer = buffer;
-    this->size = size;
+    this->bufferSize = size;
+    this->bufferIndex = 0;
 }
 
 void CCombFilter::SetDamp(float damp) {

src/cpp/viper/utils/CCombFilter.h

@@ -16,12 +16,12 @@ public:
 
 private:
     float feedback;
-    float filterstore;
+    float filterStore;
     float damp;
     float damp2;
     float *buffer;
-    uint32_t size;
-    uint32_t bufidx;
+    uint32_t bufferSize;
+    uint32_t bufferIndex;
 };
 
 

src/cpp/viper/utils/Crossfeed.cpp

@@ -71,18 +71,18 @@ uint16_t Crossfeed::GetCutoff() {
 }
 
 float Crossfeed::GetFeedback() {
-    return (float) this->preset.feedback / 10.f;
+    return (float) this->preset.feedback / 10.0f;
 }
 
 float Crossfeed::GetLevelDelay() {
     if (this->preset.cutoff <= 1800) {
-        return (18700.f / (float) this->preset.cutoff) * 10.f;
+        return (float) ((18700.0 / (double) this->preset.cutoff) * 10.0);
     } else {
-        return 0.f;
+        return 0.0;
     }
 }
 
-preset_t Crossfeed::GetPreset() {
+struct Crossfeed::Preset Crossfeed::GetPreset() {
     return this->preset;
 }
 
@@ -92,16 +92,16 @@ void Crossfeed::SetCutoff(uint16_t cutoff) {
 }
 
 void Crossfeed::SetFeedback(float feedback) {
-    this->preset.feedback = (uint16_t) (feedback * 10);
+    this->preset.feedback = (uint16_t) (feedback * 10.0f);
     Reset();
 }
 
-void Crossfeed::SetPreset(preset_t preset) {
+void Crossfeed::SetPreset(struct Crossfeed::Preset preset) {
     this->preset = preset;
     Reset();
 }
 
-void Crossfeed::SetSamplingRate(uint32_t samplerate) {
-    this->samplerate = samplerate;
+void Crossfeed::SetSamplingRate(uint32_t samplingRate) {
+    this->samplerate = samplingRate;
     Reset();
 }

src/cpp/viper/utils/Crossfeed.h

@@ -1,15 +1,14 @@
 #pragma once
 
-
 #include <cstdint>
 
-typedef struct {
-    uint16_t cutoff;
-    uint16_t feedback;
-} preset_t;
-
 class Crossfeed {
 public:
+    struct Preset {
+        uint16_t cutoff;
+        uint16_t feedback;
+    };
+
     Crossfeed();
 
     void Reset();
@@ -24,15 +23,15 @@ public:
 
     float GetLevelDelay();
 
-    preset_t GetPreset();
+    struct Preset GetPreset();
 
     void SetCutoff(uint16_t cutoff);
 
     void SetFeedback(float feedback);
 
-    void SetPreset(preset_t preset);
+    void SetPreset(struct Preset preset);
 
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
 
     uint32_t samplerate;
     float a0_lo, b1_lo;
@@ -41,5 +40,5 @@ public:
     struct {
         float asis[2], lo[2], hi[2];
     } lfs;
-    preset_t preset;
+    struct Preset preset;
 };

src/cpp/viper/utils/DepthSurround.cpp

@@ -1,5 +1,4 @@
 #include "DepthSurround.h"
-#include <cstring>
 #include <cmath>
 #include "../constants.h"
 
@@ -22,15 +21,15 @@ void DepthSurround::Process(float *samples, uint32_t size) {
                 float sampleLeft = samples[2 * i];
                 float sampleRight = samples[2 * i + 1];
 
-                this->prev[0] = this->gain * this->delay[0].ProcessSample(sampleLeft + this->prev[1]);
-                this->prev[1] = this->gain * this->delay[1].ProcessSample(sampleRight + this->prev[0]);
+                this->prev[0] = this->gain * this->timeConstDelay[0].ProcessSample(sampleLeft + this->prev[1]);
+                this->prev[1] = this->gain * this->timeConstDelay[1].ProcessSample(sampleRight + this->prev[0]);
 
                 float l = this->prev[0] + sampleLeft;
                 float r = this->prev[1] + sampleRight;
 
                 float diff = (l - r) / 2.f;
                 float avg = (l + r) / 2.f;
-                float avgOut = this->highpass.ProcessSample(diff);
+                float avgOut = (float) this->highpass.ProcessSample(diff);
                 samples[2 * i] = avg + (diff - avgOut);
                 samples[2 * i + 1] = avg - (diff - avgOut);
             }
@@ -39,15 +38,15 @@ void DepthSurround::Process(float *samples, uint32_t size) {
                 float sampleLeft = samples[2 * i];
                 float sampleRight = samples[2 * i + 1];
 
-                this->prev[0] = this->gain * this->delay[0].ProcessSample(sampleLeft + this->prev[1]);
-                this->prev[1] = -this->gain * this->delay[1].ProcessSample(sampleRight + this->prev[0]);
+                this->prev[0] = this->gain * this->timeConstDelay[0].ProcessSample(sampleLeft + this->prev[1]);
+                this->prev[1] = -this->gain * this->timeConstDelay[1].ProcessSample(sampleRight + this->prev[0]);
 
                 float l = this->prev[0] + sampleLeft;
                 float r = this->prev[1] + sampleRight;
 
                 float diff = (l - r) / 2.f;
                 float avg = (l + r) / 2.f;
-                float avgOut = this->highpass.ProcessSample(diff);
+                float avgOut = (float) this->highpass.ProcessSample(diff);
                 samples[2 * i] = avg + (diff - avgOut);
                 samples[2 * i + 1] = avg - (diff - avgOut);
             }
@@ -59,20 +58,20 @@ void DepthSurround::RefreshStrength(short strength) {
     this->strengthAtLeast500 = strength >= 500;
     this->enabled = strength != 0;
     if (strength != 0) {
-        float gain = powf(10.0f, ((strength / 1000.0f) * 10.0f - 15.0f) / 20.0f);
-        if (fabsf(gain) > 1.0f) {
-            gain = 1.0f;
+        float gain = (float) pow(10.0, ((strength / 1000.0) * 10.0 - 15.0) / 20.0);
+        if (gain > 1.0) {
+            gain = 1.0;
         }
-        this->gain = gain;
+        this->gain = (float) gain;
     } else {
-        this->gain = 0;
+        this->gain = 0.0;
     }
 }
 
-void DepthSurround::SetSamplingRate(uint32_t samplerate) {
-    this->delay[0].SetParameters(samplerate, 0.02);
-    this->delay[1].SetParameters(samplerate, 0.014);
-    this->highpass.SetHighPassParameter(800.0f, samplerate, -11.0f, 0.72f, 0);
+void DepthSurround::SetSamplingRate(uint32_t samplingRate) {
+    this->timeConstDelay[0].SetParameters(samplingRate, 0.02);
+    this->timeConstDelay[1].SetParameters(samplingRate, 0.014);
+    this->highpass.SetHighPassParameter(800.0f, samplingRate, -11.0f, 0.72f, 0.0);
     for (auto &prev : this->prev) {
         prev = 0.0f;
     }

src/cpp/viper/utils/DepthSurround.h

@@ -4,24 +4,21 @@
 #include "Biquad.h"
 #include "TimeConstDelay.h"
 
-
 class DepthSurround {
 public:
     DepthSurround();
 
     void Process(float *samples, uint32_t size);
-
     void RefreshStrength(short strength);
-
-    void SetSamplingRate(uint32_t samplerate);
-
+    void SetSamplingRate(uint32_t samplingRate);
     void SetStrength(short strength);
 
+private:
     short strength;
     bool enabled;
     bool strengthAtLeast500;
-    uint32_t gain;
+    float gain;
     float prev[2];
-    TimeConstDelay delay[2];
+    TimeConstDelay timeConstDelay[2];
     Biquad highpass;
 };

src/cpp/viper/utils/DynamicBass.cpp

@@ -10,17 +10,11 @@ DynamicBass::DynamicBass() {
     this->lowFreqX = 120;
     this->highFreqX = 80;
     this->lowFreqY = 40;
-    this->highFreqY = (float) this->samplerate / 4.f;
+    this->highFreqY = (uint32_t) ((float) this->samplingRate / 4.0f);
 
     this->filterX.SetPassFilter(this->lowFreqX, this->highFreqX);
     this->filterY.SetPassFilter(this->lowFreqY, this->highFreqY);
-    this->lowPass.SetLowPassParameter(55.f, this->samplerate, this->qPeak / 666.f + 0.5f);
-}
-
-void DynamicBass::Reset() {
-    this->filterX.Reset();
-    this->filterY.Reset();
-    this->lowPass.SetLowPassParameter(55.f, this->samplerate, this->qPeak / 666.f + 0.5f);
+    this->lowPass.SetLowPassParameter(55.f, this->samplingRate, this->qPeak / 666.f + 0.5f);
 }
 
 void DynamicBass::FilterSamples(float *samples, uint32_t size) {
@@ -28,7 +22,7 @@ void DynamicBass::FilterSamples(float *samples, uint32_t size) {
         for (int i = 0; i < size; i++) {
             float left = samples[2 * i];
             float right = samples[2 * i + 1];
-            float avg = this->lowPass.ProcessSample(left + right);
+            float avg = (float) this->lowPass.ProcessSample(left + right);
             samples[2 * i] = left + avg;
             samples[2 * i + 1] = right + avg;
         }
@@ -47,18 +41,22 @@ void DynamicBass::FilterSamples(float *samples, uint32_t size) {
     }
 }
 
-void DynamicBass::SetBassGain(float gain) {
-    this->bassGain = gain;
-    this->qPeak = (gain - 1.f) / 20.f * 1600.f;
-    if (this->qPeak > 1600.f) {
-        this->qPeak = 1600.f;
-    }
-    this->lowPass.SetLowPassParameter(55.f, this->samplerate, this->qPeak / 666.f + 0.5f);
+void DynamicBass::Reset() {
+    this->filterX.Reset();
+    this->filterY.Reset();
+    this->lowPass.SetLowPassParameter(55.0, this->samplingRate, this->qPeak / 666.0f + 0.5f);
 }
 
-void DynamicBass::SetSideGain(float gainX, float gainY) {
-    this->sideGainX = gainX;
-    this->sideGainY = gainY;
+void DynamicBass::SetBassGain(float gain) {
+    this->bassGain = gain;
+
+    double x = ((gain - 1.0) / 20.0) * 1600.0;
+    if (x > 1600.0) {
+        x = 1600.0;
+    }
+    this->qPeak = (float) x;
+
+    this->lowPass.SetLowPassParameter(55.0, this->samplingRate, this->qPeak / 666.0f + 0.5f);
 }
 
 void DynamicBass::SetFilterXPassFrequency(uint32_t low, uint32_t high) {
@@ -66,8 +64,8 @@ void DynamicBass::SetFilterXPassFrequency(uint32_t low, uint32_t high) {
     this->highFreqX = high;
 
     this->filterX.SetPassFilter(low, high);
-    this->filterX.SetSamplingRate(this->samplerate);
-    this->lowPass.SetLowPassParameter(55.f, this->samplerate, this->qPeak / 666.f + 0.5f);
+    this->filterX.SetSamplingRate(this->samplingRate);
+    this->lowPass.SetLowPassParameter(55.0, this->samplingRate, this->qPeak / 666.0f + 0.5f);
 }
 
 void DynamicBass::SetFilterYPassFrequency(uint32_t low, uint32_t high) {
@@ -75,13 +73,18 @@ void DynamicBass::SetFilterYPassFrequency(uint32_t low, uint32_t high) {
     this->highFreqY = high;
 
     this->filterY.SetPassFilter(low, high);
-    this->filterY.SetSamplingRate(this->samplerate);
-    this->lowPass.SetLowPassParameter(55.f, this->samplerate, this->qPeak / 666.f + 0.5f);
+    this->filterY.SetSamplingRate(this->samplingRate);
+    this->lowPass.SetLowPassParameter(55.0, this->samplingRate, this->qPeak / 666.0f + 0.5f);
 }
 
-void DynamicBass::SetSamplingRate(uint32_t samplerate) {
-    this->samplerate = samplerate;
-    this->filterX.SetSamplingRate(samplerate);
-    this->filterY.SetSamplingRate(samplerate);
-    this->lowPass.SetLowPassParameter(55.f, samplerate, this->qPeak / 666.f + 0.5f);
+void DynamicBass::SetSamplingRate(uint32_t samplingRate) {
+    this->samplingRate = samplingRate;
+    this->filterX.SetSamplingRate(samplingRate);
+    this->filterY.SetSamplingRate(samplingRate);
+    this->lowPass.SetLowPassParameter(55.0, samplingRate, this->qPeak / 666.0f + 0.5f);
+}
+
+void DynamicBass::SetSideGain(float gainX, float gainY) {
+    this->sideGainX = gainX;
+    this->sideGainY = gainY;
 }

src/cpp/viper/utils/DynamicBass.h

@@ -18,13 +18,13 @@ public:
 
     void SetFilterYPassFrequency(uint32_t low, uint32_t high);
 
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
 
     void SetSideGain(float gainX, float gainY);
 
     uint32_t lowFreqX, highFreqX;
     uint32_t lowFreqY, highFreqY;
-    uint32_t samplerate;
+    uint32_t samplingRate;
     float qPeak;
     float bassGain;
     float sideGainX, sideGainY;

src/cpp/viper/utils/HiFi.cpp

@@ -3,7 +3,7 @@
 
 HiFi::HiFi() {
     this->gain = 1.f;
-    this->samplerate = DEFAULT_SAMPLERATE;
+    this->samplingRate = DEFAULT_SAMPLERATE;
     for (int i = 0; i < 2; i++) {
         this->buffers[i] = new WaveBuffer(2, 0x800);
         this->filters[i].lowpass = new IIR_NOrder_BW_LH(1);
@@ -54,17 +54,17 @@ void HiFi::Process(float *samples, uint32_t size) {
 
 void HiFi::Reset() {
     for (int i = 0; i < 2; i++) {
-        this->filters[i].lowpass->setLPF(120.0, this->samplerate);
+        this->filters[i].lowpass->setLPF(120.0, this->samplingRate);
         this->filters[i].lowpass->Mute();
-        this->filters[i].highpass->setHPF(1200.0, this->samplerate);
+        this->filters[i].highpass->setHPF(1200.0, this->samplingRate);
         this->filters[i].highpass->Mute();
-        this->filters[i].bandpass->setBPF(120.f, 1200.f, this->samplerate);
+        this->filters[i].bandpass->setBPF(120.f, 1200.f, this->samplingRate);
         this->filters[i].bandpass->Mute();
     }
     this->buffers[0]->Reset();
-    this->buffers[0]->PushZeros(this->samplerate / 400);
+    this->buffers[0]->PushZeros(this->samplingRate / 400);
     this->buffers[1]->Reset();
-    this->buffers[1]->PushZeros(this->samplerate / 200);
+    this->buffers[1]->PushZeros(this->samplingRate / 200);
 
 }
 
@@ -72,7 +72,7 @@ void HiFi::SetClarity(float value) {
     this->gain = value;
 }
 
-void HiFi::SetSamplingRate(uint32_t samplerate) {
-    this->samplerate = samplerate;
+void HiFi::SetSamplingRate(uint32_t samplingRate) {
+    this->samplingRate = samplingRate;
     Reset();
 }

src/cpp/viper/utils/HiFi.h

@@ -17,7 +17,7 @@ public:
 
     void SetClarity(float value);
 
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
 
     WaveBuffer *buffers[2];
     struct {
@@ -26,7 +26,7 @@ public:
         IIR_NOrder_BW_BP *bandpass;
     } filters[2];
     float gain;
-    uint32_t samplerate;
+    uint32_t samplingRate;
 };
 
 

src/cpp/viper/utils/IIR_1st.cpp

@@ -11,7 +11,6 @@ IIR_1st::IIR_1st() {
     Mute();
 }
 
-
 void IIR_1st::Mute() {
     this->prevSample = 0.f;
 }
@@ -22,18 +21,18 @@ void IIR_1st::SetCoefficients(float b0, float b1, float a1) {
     this->a1 = a1;
 }
 
-#define angle(freq, samplerate) (expf(-1*(float)M_PI*(freq)/((float)(samplerate)/2.f)))
-#define omega() (2.f * (float)M_PI * frequency / (float)samplerate)
-#define omega_2() ((float)M_PI * frequency / (float)samplerate)
+#define angle(freq, samplingRate) (expf(-1*(float)M_PI*(freq)/((float)(samplingRate)/2.f)))
+#define omega() (2.f * (float)M_PI * frequency / (float)samplingRate)
+#define omega_2() ((float)M_PI * frequency / (float)samplingRate)
 
-void IIR_1st::setHPF_A(float frequency, uint32_t samplerate) {
-    this->a1 = angle(frequency, samplerate);
+void IIR_1st::setHPF_A(float frequency, uint32_t samplingRate) {
+    this->a1 = angle(frequency, samplingRate);
     float norm = (1 + a1) / 2.f;
     this->b0 = norm;
     this->b1 = -norm;
 }
 
-void IIR_1st::setHPF_BW(float frequency, uint32_t samplerate) {
+void IIR_1st::setHPF_BW(float frequency, uint32_t samplingRate) {
     float omega_2 = omega_2();
     float tan_omega_2 = tanf(omega_2);
     this->b0 = 1 / (1 + tan_omega_2);
@@ -41,32 +40,32 @@ void IIR_1st::setHPF_BW(float frequency, uint32_t samplerate) {
     this->a1 = (1 - tan_omega_2) / (1 + tan_omega_2);
 }
 
-void IIR_1st::setHPF_C(float frequency, uint32_t samplerate) {
-    this->b0 = (float) samplerate / ((float) samplerate + frequency);
+void IIR_1st::setHPF_C(float frequency, uint32_t samplingRate) {
+    this->b0 = (float) samplingRate / ((float) samplingRate + frequency);
     this->b1 = -1 * this->b0;
-    this->a1 = ((float) samplerate - frequency) / ((float) samplerate + frequency);
+    this->a1 = ((float) samplingRate - frequency) / ((float) samplingRate + frequency);
 }
 
-void IIR_1st::setHPFwLPS_A(float frequency, uint32_t samplerate) {
+void IIR_1st::setHPFwLPS_A(float frequency, uint32_t samplingRate) {
     this->a1 = -0.12f;
     this->b0 = -1.f;
-    this->b1 = angle(frequency, samplerate);
+    this->b1 = angle(frequency, samplingRate);
     float norm = (1 - this->a1) / fabsf(this->b0 + this->b1);
     this->b0 *= norm;
     this->b1 *= norm;;
 }
 
-void IIR_1st::setHSF_A(float f1, float f2, uint32_t samplerate) {
-    this->a1 = angle(f1, samplerate);
+void IIR_1st::setHSF_A(float f1, float f2, uint32_t samplingRate) {
+    this->a1 = angle(f1, samplingRate);
     this->b0 = -1.f;
-    this->b1 = angle(f2, samplerate);
+    this->b1 = angle(f2, samplingRate);
     float norm = (1 - this->a1) / (this->b0 + this->b1);
     this->b0 *= norm;
     this->b1 *= norm;
 }
 
-void IIR_1st::setLPF_A(float frequency, uint32_t samplerate) {
-    this->a1 = angle(frequency, samplerate);
+void IIR_1st::setLPF_A(float frequency, uint32_t samplingRate) {
+    this->a1 = angle(frequency, samplingRate);
     this->b0 = 1.f;
     this->b1 = 0.12f;
     float norm = (1 + this->a1) / (this->b0 + this->b1);
@@ -74,7 +73,7 @@ void IIR_1st::setLPF_A(float frequency, uint32_t samplerate) {
     this->b1 *= norm;
 }
 
-void IIR_1st::setLPF_BW(float frequency, uint32_t samplerate) {
+void IIR_1st::setLPF_BW(float frequency, uint32_t samplingRate) {
     float omega_2 = omega_2();
     float tan_omega_2 = tanf(omega_2);
     this->a1 = (1 - tan_omega_2) / (1 + tan_omega_2);
@@ -82,16 +81,16 @@ void IIR_1st::setLPF_BW(float frequency, uint32_t samplerate) {
     this->b1 = this->b0;
 }
 
-void IIR_1st::setLPF_C(float frequency, uint32_t samplerate) {
-    this->b0 = frequency / ((float) samplerate + frequency);
+void IIR_1st::setLPF_C(float frequency, uint32_t samplingRate) {
+    this->b0 = frequency / ((float) samplingRate + frequency);
     this->b1 = this->b0;
-    this->a1 = ((float) samplerate - frequency) / ((float) samplerate + frequency);
+    this->a1 = ((float) samplingRate - frequency) / ((float) samplingRate + frequency);
 }
 
-void IIR_1st::setLSF_A(float f1, float f2, uint32_t samplerate) {
-    this->a1 = angle(f1, samplerate);
+void IIR_1st::setLSF_A(float f1, float f2, uint32_t samplingRate) {
+    this->a1 = angle(f1, samplingRate);
     this->b0 = -1.f;
-    this->b1 = angle(f2, samplerate);
+    this->b1 = angle(f2, samplingRate);
 }
 
 void IIR_1st::setPole(float a1) {
@@ -100,7 +99,7 @@ void IIR_1st::setPole(float a1) {
     this->b1 = 0.f;
 }
 
-void IIR_1st::setPoleHPF(float frequency, uint32_t samplerate) {
+void IIR_1st::setPoleHPF(float frequency, uint32_t samplingRate) {
     float omega = omega();
     float cos_omega = cosf(omega);
     float tmp = (2.f + cos_omega);
@@ -110,7 +109,7 @@ void IIR_1st::setPoleHPF(float frequency, uint32_t samplerate) {
     this->b1 = 0;
 }
 
-void IIR_1st::setPoleLPF(float frequency, uint32_t samplerate) {
+void IIR_1st::setPoleLPF(float frequency, uint32_t samplingRate) {
     float omega = omega();
     float cos_omega = cosf(omega);
     float tmp = (2.f - cos_omega);
@@ -129,7 +128,7 @@ void IIR_1st::setZero(float b1) {
     this->b1 *= norm;
 }
 
-void IIR_1st::setZeroHPF(float frequency, uint32_t samplerate) {
+void IIR_1st::setZeroHPF(float frequency, uint32_t samplingRate) {
     float omega = omega();
     float cos_omega = cosf(omega);
     float tmp = (1.f - 2.f * cos_omega);
@@ -139,7 +138,7 @@ void IIR_1st::setZeroHPF(float frequency, uint32_t samplerate) {
     this->b1 = -coeff / (1.f + coeff);
 }
 
-void IIR_1st::setZeroLPF(float frequency, uint32_t samplerate) {
+void IIR_1st::setZeroLPF(float frequency, uint32_t samplingRate) {
     float omega = omega();
     float cos_omega = cosf(omega);
     float tmp = (1.f + 2.f * cos_omega);

src/cpp/viper/utils/IIR_1st.h

@@ -10,35 +10,35 @@ public:
 
     void SetCoefficients(float b0, float b1, float a1);
 
-    void setHPF_A(float frequency, uint32_t samplerate);
+    void setHPF_A(float frequency, uint32_t samplingRate);
 
-    void setHPF_BW(float frequency, uint32_t samplerate);
+    void setHPF_BW(float frequency, uint32_t samplingRate);
 
-    void setHPF_C(float frequency, uint32_t samplerate);
+    void setHPF_C(float frequency, uint32_t samplingRate);
 
-    void setHPFwLPS_A(float frequency, uint32_t samplerate);
+    void setHPFwLPS_A(float frequency, uint32_t samplingRate);
 
-    void setHSF_A(float f1, float f2, uint32_t samplerate);
+    void setHSF_A(float f1, float f2, uint32_t samplingRate);
 
-    void setLPF_A(float frequency, uint32_t samplerate);
+    void setLPF_A(float frequency, uint32_t samplingRate);
 
-    void setLPF_BW(float frequency, uint32_t samplerate);
+    void setLPF_BW(float frequency, uint32_t samplingRate);
 
-    void setLPF_C(float frequency, uint32_t samplerate);
+    void setLPF_C(float frequency, uint32_t samplingRate);
 
-    void setLSF_A(float f1, float f2, uint32_t samplerate);
+    void setLSF_A(float f1, float f2, uint32_t samplingRate);
 
     void setPole(float a1);
 
-    void setPoleHPF(float frequency, uint32_t samplerate);
+    void setPoleHPF(float frequency, uint32_t samplingRate);
 
-    void setPoleLPF(float frequency, uint32_t samplerate);
+    void setPoleLPF(float frequency, uint32_t samplingRate);
 
     void setZero(float b1);
 
-    void setZeroHPF(float frequency, uint32_t samplerate);
+    void setZeroHPF(float frequency, uint32_t samplingRate);
 
-    void setZeroLPF(float frequency, uint32_t samplerate);
+    void setZeroLPF(float frequency, uint32_t samplingRate);
 
     float b0, b1, a1;
     float prevSample;

src/cpp/viper/utils/IIR_NOrder_BW_BP.cpp

@@ -23,9 +23,9 @@ void IIR_NOrder_BW_BP::Mute() {
     }
 }
 
-void IIR_NOrder_BW_BP::setBPF(float highCut, float lowCut, uint32_t samplerate) {
+void IIR_NOrder_BW_BP::setBPF(float highCut, float lowCut, uint32_t samplingRate) {
     for (int x = 0; x < this->order; x++) {
-        this->lowpass[x].setLPF_BW(lowCut, samplerate);
-        this->highpass[x].setHPF_BW(highCut, samplerate);
+        this->lowpass[x].setLPF_BW(lowCut, samplingRate);
+        this->highpass[x].setHPF_BW(highCut, samplingRate);
     }
 }

src/cpp/viper/utils/IIR_NOrder_BW_BP.h

@@ -10,7 +10,7 @@ public:
 
     void Mute();
 
-    void setBPF(float highCut, float lowCut, uint32_t samplerate);
+    void setBPF(float highCut, float lowCut, uint32_t samplingRate);
 
     IIR_1st *lowpass;
     IIR_1st *highpass;

src/cpp/viper/utils/IIR_NOrder_BW_LH.cpp

@@ -19,14 +19,14 @@ void IIR_NOrder_BW_LH::Mute() {
     }
 }
 
-void IIR_NOrder_BW_LH::setLPF(float frequency, uint32_t samplerate) {
+void IIR_NOrder_BW_LH::setLPF(float frequency, uint32_t samplingRate) {
     for (int x = 0; x < this->order; x++) {
-        this->filters[x].setLPF_BW(frequency, samplerate);
+        this->filters[x].setLPF_BW(frequency, samplingRate);
     }
 }
 
-void IIR_NOrder_BW_LH::setHPF(float frequency, uint32_t samplerate) {
+void IIR_NOrder_BW_LH::setHPF(float frequency, uint32_t samplingRate) {
     for (int x = 0; x < this->order; x++) {
-        this->filters[x].setHPF_BW(frequency, samplerate);
+        this->filters[x].setHPF_BW(frequency, samplingRate);
     }
 }

src/cpp/viper/utils/IIR_NOrder_BW_LH.h

@@ -10,9 +10,9 @@ public:
 
     void Mute();
 
-    void setLPF(float frequency, uint32_t samplerate);
+    void setLPF(float frequency, uint32_t samplingRate);
 
-    void setHPF(float frequency, uint32_t samplerate);
+    void setHPF(float frequency, uint32_t samplingRate);
 
     IIR_1st *filters;
     uint32_t order;

src/cpp/viper/utils/MinPhaseIIRCoeffs.cpp

@@ -1 +1,165 @@
 #include "MinPhaseIIRCoeffs.h"
+#include "../constants.h"
+#include <cmath>
+
+static const float MIN_PHASE_IIR_COEFFS_FREQ_10[] = {
+        31.0,
+        62.0,
+        125.0,
+        250.0,
+        500.0,
+        1000.0,
+        2000.0,
+        4000.0,
+        8000.0,
+        16000.0
+};
+
+static const float MIN_PHASE_IIR_COEFFS_FREQ_15[] = {
+        25.0,
+        40.0,
+        63.0,
+        100.0,
+        160.0,
+        250.0,
+        400.0,
+        630.0,
+        1000.0,
+        1600.0,
+        2500.0,
+        4000.0,
+        6300.0,
+        10000.0,
+        16000.0
+};
+
+static const float MIN_PHASE_IIR_COEFFS_FREQ_25[] = {
+        20.0,
+        31.5,
+        40.0,
+        50.0,
+        80.0,
+        100.0,
+        125.0,
+        160.0,
+        250.0,
+        315.0,
+        400.0,
+        500.0,
+        800.0,
+        1000.0,
+        1250.0,
+        1600.0,
+        2500.0,
+        3150.0,
+        4000.0,
+        5000.0,
+        8000.0,
+        10000.0,
+        12500.0,
+        16000.0,
+        20000.0
+};
+
+static const float MIN_PHASE_IIR_COEFFS_FREQ_31[] = {
+        20.0,
+        25.0,
+        31.5,
+        40.0,
+        50.0,
+        63.0,
+        80.0,
+        100.0,
+        125.0,
+        160.0,
+        200.0,
+        250.0,
+        315.0,
+        400.0,
+        500.0,
+        630.0,
+        800.0,
+        1000.0,
+        1250.0,
+        1600.0,
+        2000.0,
+        2500.0,
+        3150.0,
+        4000.0,
+        5000.0,
+        6300.0,
+        8000.0,
+        10000.0,
+        12500.0,
+        16000.0,
+        20000.0
+};
+
+MinPhaseIIRCoeffs::MinPhaseIIRCoeffs() {
+    this->coeffs = nullptr;
+    this->samplingRate = DEFAULT_SAMPLERATE;
+    this->freqs = 0;
+}
+
+MinPhaseIIRCoeffs::~MinPhaseIIRCoeffs() {
+    delete this->coeffs;
+}
+
+void MinPhaseIIRCoeffs::Find_F1_F2(double param_2, double param_3, double *parma_4, double *param_5) {
+    double x = pow(2.0, param_3 / 2.0);
+    *param_5 = param_2 / x;
+    *parma_4 = param_2 * x;
+}
+
+float *MinPhaseIIRCoeffs::GetCoefficients() {
+    return this->coeffs;
+}
+
+float MinPhaseIIRCoeffs::GetIndexFrequency(uint32_t index) {
+    switch (this->freqs) {
+        case 10:
+            return MIN_PHASE_IIR_COEFFS_FREQ_10[index];
+        case 15:
+            return MIN_PHASE_IIR_COEFFS_FREQ_15[index];
+        case 25:
+            return MIN_PHASE_IIR_COEFFS_FREQ_25[index];
+        case 31:
+            return MIN_PHASE_IIR_COEFFS_FREQ_31[index];
+        default:
+            return 0.0;
+    }
+}
+
+int MinPhaseIIRCoeffs::SolveRoot(double param_2, double param_3, double param_4, double *param_5) {
+    double x = (param_4 - pow(param_3, 2.0) / (param_2 * 4.0)) / param_2;
+    double y = param_3 / (param_2 * 2.0);
+
+    if (x >= 0.0) {
+        return -1;
+    }
+
+    double z = sqrt(-x);
+    double a = -y - z;
+    double b = z - y;
+    if (a > b) {
+        *param_5 = b;
+    } else {
+        *param_5 = a;
+    }
+
+    return 0;
+}
+
+int MinPhaseIIRCoeffs::UpdateCoeffs(uint32_t freqs, int samplingRate) {
+    if ((freqs != 10 && freqs != 15 && freqs != 25 && freqs != 31) || samplingRate != 44100) {
+        return 0;
+    }
+
+    this->freqs = freqs;
+    this->samplingRate = samplingRate;
+
+    delete this->coeffs;
+    this->coeffs = new float[freqs * 5];
+
+    return 0;
+}

src/cpp/viper/utils/MinPhaseIIRCoeffs.h

@@ -1,13 +1,20 @@
 #pragma once
 
+#include <cstdint>
+
 class MinPhaseIIRCoeffs {
 public:
     MinPhaseIIRCoeffs();
     ~MinPhaseIIRCoeffs();
 
-    void Find_F1_F2(double a, double b, double *c, double *d);
+    void Find_F1_F2(double param_2, double param_3, double *parma_4, double *param_5);
     float *GetCoefficients();
-    float *GetIndexFrequency();
-    int *SolveRoot(double a, double b, double c, double *d);
-    int UpdateCoeffs(int a, int samplingRate);
+    float GetIndexFrequency(uint32_t param_1);
+    int SolveRoot(double param_2, double param_3, double param_4, double *param_5);
+    int UpdateCoeffs(uint32_t freqs, int samplingRate);
+
+private:
+    float *coeffs;
+    uint32_t samplingRate;
+    uint32_t freqs;
 };

src/cpp/viper/utils/MultiBiquad.cpp

@@ -1,5 +1,5 @@
-#include <cmath>
 #include "MultiBiquad.h"
+#include <cmath>
 
 MultiBiquad::MultiBiquad() {
     this->y_2 = 0;

src/cpp/viper/utils/MultiBiquad.h

@@ -1,18 +1,20 @@
 #pragma once
 
-enum FilterType {
-    LOWPASS = 0,
-    HIGHPASS = 1,
-    BANDPASS = 2,
-    BANDSTOP = 3,
-    ALLPASS = 4,
-    PEAK = 5,
-    LOWSHELF = 6,
-    HIGHSHELF = 7
-};
+#include <cstdint>
 
 class MultiBiquad {
 public:
+    enum FilterType {
+        LOWPASS = 0,
+        HIGHPASS = 1,
+        BANDPASS = 2,
+        BANDSTOP = 3,
+        ALLPASS = 4,
+        PEAK = 5,
+        LOWSHELF = 6,
+        HIGHSHELF = 7
+    };
+
     MultiBiquad();
 
     double ProcessSample(double sample);

src/cpp/viper/utils/NoiseSharpening.cpp

@@ -2,7 +2,7 @@
 #include "../constants.h"
 
 NoiseSharpening::NoiseSharpening() {
-    this->samplerate = DEFAULT_SAMPLERATE;
+    this->samplingRate = DEFAULT_SAMPLERATE;
     this->gain = 0.f;
     Reset();
 }
@@ -36,7 +36,7 @@ void NoiseSharpening::Process(float *buffer, uint32_t size) {
 
 void NoiseSharpening::Reset() {
     for (int i = 0; i < 2; i++) {
-        this->filters[i].setLPF_BW(this->samplerate / 2.f - 1000.f, this->samplerate);
+        this->filters[i].setLPF_BW(this->samplingRate / 2.f - 1000.f, this->samplingRate);
         this->filters[i].Mute();
         this->in[i] = 0.f;
     }
@@ -46,7 +46,7 @@ void NoiseSharpening::SetGain(float gain) {
     this->gain = gain;
 }
 
-void NoiseSharpening::SetSamplingRate(uint32_t samplerate) {
-    this->samplerate = samplerate;
+void NoiseSharpening::SetSamplingRate(uint32_t samplingRate) {
+    this->samplingRate = samplingRate;
     Reset();
 }

src/cpp/viper/utils/NoiseSharpening.h

@@ -13,11 +13,11 @@ public:
 
     void SetGain(float gain);
 
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
 
     IIR_1st filters[2];
     float in[2];
-    int32_t samplerate;
+    int32_t samplingRate;
     float gain;
 };
 

src/cpp/viper/utils/PassFilter.cpp

@@ -6,7 +6,7 @@ PassFilter::PassFilter() {
     this->filters[1] = new IIR_NOrder_BW_LH(3);
     this->filters[2] = new IIR_NOrder_BW_LH(1);
     this->filters[3] = new IIR_NOrder_BW_LH(1);
-    this->samplerate = DEFAULT_SAMPLERATE;
+    this->samplingRate = DEFAULT_SAMPLERATE;
     Reset();
 }
 
@@ -19,14 +19,14 @@ PassFilter::~PassFilter() {
 
 void PassFilter::Reset() {
     uint32_t cutoff;
-    if (this->samplerate < 44100) {
-        cutoff = this->samplerate - 100;
+    if (this->samplingRate < 44100) {
+        cutoff = this->samplingRate - 100;
     } else {
         cutoff = 18000;
     }
 
-    this->filters[0]->setLPF((float) cutoff, this->samplerate);
-    this->filters[1]->setLPF((float) cutoff, this->samplerate);
+    this->filters[0]->setLPF((float) cutoff, this->samplingRate);
+    this->filters[1]->setLPF((float) cutoff, this->samplingRate);
     this->filters[2]->setLPF(10.f, cutoff);
     this->filters[3]->setLPF(10.f, cutoff);
 
@@ -51,7 +51,7 @@ void PassFilter::ProcessFrames(float *buffer, uint32_t size) {
     }
 }
 
-void PassFilter::SetSamplingRate(uint32_t samplerate) {
-    this->samplerate = samplerate;
+void PassFilter::SetSamplingRate(uint32_t samplingRate) {
+    this->samplingRate = samplingRate;
     Reset();
 }

src/cpp/viper/utils/PassFilter.h

@@ -13,8 +13,8 @@ public:
 
     void ProcessFrames(float *buffer, uint32_t size);
 
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
 
     IIR_NOrder_BW_LH *filters[4];
-    uint32_t samplerate;
+    uint32_t samplingRate;
 };

src/cpp/viper/utils/PolesFilter.cpp

@@ -4,7 +4,7 @@
 #include <cmath>
 
 PolesFilter::PolesFilter() {
-    this->samplerate = DEFAULT_SAMPLERATE;
+    this->samplingRate = DEFAULT_SAMPLERATE;
     this->lower_freq = 160;
     this->upper_freq = 8000;
     UpdateCoeff();
@@ -18,10 +18,10 @@ void PolesFilter::UpdateCoeff() {
     memset(&this->channels[0], 0, sizeof(channel));
     memset(&this->channels[1], 0, sizeof(channel));
 
-    this->channels[0].lower_angle = ((float) this->lower_freq * M_PI / (float) this->samplerate);
-    this->channels[1].lower_angle = ((float) this->lower_freq * M_PI / (float) this->samplerate);
-    this->channels[0].upper_angle = ((float) this->upper_freq * M_PI / (float) this->samplerate);
-    this->channels[1].upper_angle = ((float) this->upper_freq * M_PI / (float) this->samplerate);
+    this->channels[0].lower_angle = ((float) this->lower_freq * M_PI / (float) this->samplingRate);
+    this->channels[1].lower_angle = ((float) this->lower_freq * M_PI / (float) this->samplingRate);
+    this->channels[0].upper_angle = ((float) this->upper_freq * M_PI / (float) this->samplingRate);
+    this->channels[1].upper_angle = ((float) this->upper_freq * M_PI / (float) this->samplingRate);
 }
 
 inline void DoFilterSide(channel *side, float sample, float *out1, float *out2, float *out3) {
@@ -59,7 +59,7 @@ void PolesFilter::SetPassFilter(uint32_t lower_freq, uint32_t upper_freq) {
     UpdateCoeff();
 }
 
-void PolesFilter::SetSamplingRate(uint32_t samplerate) {
-    this->samplerate = samplerate;
+void PolesFilter::SetSamplingRate(uint32_t samplingRate) {
+    this->samplingRate = samplingRate;
     UpdateCoeff();
 }

src/cpp/viper/utils/PolesFilter.h

@@ -26,12 +26,12 @@ public:
 
     void SetPassFilter(uint32_t lower_freq, uint32_t upper_freq);
 
-    void SetSamplingRate(uint32_t samplerate);
+    void SetSamplingRate(uint32_t samplingRate);
 
     channel channels[2];
     uint32_t lower_freq;
     uint32_t upper_freq;
-    uint32_t samplerate;
+    uint32_t samplingRate;
 };
 
 

src/cpp/viper/utils/Subwoofer.cpp

@@ -4,12 +4,12 @@
 
 Subwoofer::Subwoofer() {
     uint32_t samplingRate = DEFAULT_SAMPLERATE;
-    this->peak[0].RefreshFilter(FilterType::PEAK, 0.0, 37.0, samplingRate, 1.0, false);
-    this->peak[1].RefreshFilter(FilterType::PEAK, 0.0, 37.0, samplingRate, 1.0, false);
-    this->peakLow[0].RefreshFilter(FilterType::PEAK, 0.0, 75.0, samplingRate, 1.0, false);
-    this->peakLow[1].RefreshFilter(FilterType::PEAK, 0.0, 75.0, samplingRate, 1.0, false);
-    this->lowpass[0].RefreshFilter(FilterType::LOWPASS, 0.0, 200.0, samplingRate, 1.0, false);
-    this->lowpass[1].RefreshFilter(FilterType::LOWPASS, 0.0, 200.0, samplingRate, 1.0, false);
+    this->peak[0].RefreshFilter(MultiBiquad::FilterType::PEAK, 0.0, 37.0, samplingRate, 1.0, false);
+    this->peak[1].RefreshFilter(MultiBiquad::FilterType::PEAK, 0.0, 37.0, samplingRate, 1.0, false);
+    this->peakLow[0].RefreshFilter(MultiBiquad::FilterType::PEAK, 0.0, 75.0, samplingRate, 1.0, false);
+    this->peakLow[1].RefreshFilter(MultiBiquad::FilterType::PEAK, 0.0, 75.0, samplingRate, 1.0, false);
+    this->lowpass[0].RefreshFilter(MultiBiquad::FilterType::LOWPASS, 0.0, 200.0, samplingRate, 1.0, false);
+    this->lowpass[1].RefreshFilter(MultiBiquad::FilterType::LOWPASS, 0.0, 200.0, samplingRate, 1.0, false);
 }
 
 void Subwoofer::Process(float *samples, uint32_t size) {
@@ -27,10 +27,10 @@ void Subwoofer::SetBassGain(uint32_t samplingRate, float gainDb) {
     float gain = 20.0f * log10( gainDb);
     float gainLower = 20.0f * log10( gainDb / 8.0f);
 
-    this->peak[0].RefreshFilter(FilterType::PEAK, gain, 44.0, samplingRate, 0.75, true);
-    this->peak[1].RefreshFilter(FilterType::PEAK, gain, 44.0, samplingRate, 0.75, true);
-    this->peakLow[0].RefreshFilter(FilterType::PEAK, gainLower, 80.0, samplingRate, 0.2, true);
-    this->peakLow[1].RefreshFilter(FilterType::PEAK, gainLower, 80.0, samplingRate, 0.2, true);
-    this->lowpass[0].RefreshFilter(FilterType::LOWPASS, 0.0, 380.0, samplingRate, 0.6, false);
-    this->lowpass[1].RefreshFilter(FilterType::LOWPASS, 0.0, 380.0, samplingRate, 0.6, false);
+    this->peak[0].RefreshFilter(MultiBiquad::FilterType::PEAK, gain, 44.0, samplingRate, 0.75, true);
+    this->peak[1].RefreshFilter(MultiBiquad::FilterType::PEAK, gain, 44.0, samplingRate, 0.75, true);
+    this->peakLow[0].RefreshFilter(MultiBiquad::FilterType::PEAK, gainLower, 80.0, samplingRate, 0.2, true);
+    this->peakLow[1].RefreshFilter(MultiBiquad::FilterType::PEAK, gainLower, 80.0, samplingRate, 0.2, true);
+    this->lowpass[0].RefreshFilter(MultiBiquad::FilterType::LOWPASS, 0.0, 380.0, samplingRate, 0.6, false);
+    this->lowpass[1].RefreshFilter(MultiBiquad::FilterType::LOWPASS, 0.0, 380.0, samplingRate, 0.6, false);
 }

src/cpp/viper/utils/TimeConstDelay.cpp

@@ -1,6 +1,5 @@
-#include <cstdlib>
-#include <cstring>
 #include "TimeConstDelay.h"
+#include <cstdlib>
 
 TimeConstDelay::TimeConstDelay() {
     this->samples = nullptr;
@@ -19,11 +18,11 @@ float TimeConstDelay::ProcessSample(float sample) {
         this->offset = (int) modf((float) this->offset + 1, (float *) &this->sampleCount); // TODO: check if this is correct
         return val;
     }
-    return 0.0f;
+    return 0.0;
 }
 
-void TimeConstDelay::SetParameters(uint32_t samplerate, float delay) {
-    this->sampleCount = (int) ((float) samplerate * delay * 0.5f);
+void TimeConstDelay::SetParameters(uint32_t samplingRate, float delay) {
+    this->sampleCount = samplingRate * (uint32_t) ceil(delay);
     delete this->samples;
     this->samples = new float[this->sampleCount]();
     this->offset = 0;

src/cpp/viper/utils/TimeConstDelay.h

@@ -10,7 +10,7 @@ public:
 
     float ProcessSample(float sample);
 
-    void SetParameters(uint32_t samplerate, float delay);
+    void SetParameters(uint32_t samplingRate, float delay);
 
     float *samples;
     uint32_t offset;