AudioEffectBiquad.h

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//
// Created by Jason Smith on 2/20/20.
//  Copyright © 2020 Jason Smith. All rights reserved.
//
 
#ifndef AUDIOFXFRAMEWORK_AudioEffectBiquad_H
#define AUDIOFXFRAMEWORK_AudioEffectBiquad_H
 
 
#include "AudioEffect.h"
#include "RingBuffer.h"
 
class CAudioEffectBiquad: public CAudioEffect
{
public:
    
    enum FilterType_t
    {
      kLowpass,
      kHighpass,
      kBandpass,
      kAllpass,
      kPeak,
      kNotch,
      kLowshelf,
      kHighshelf
    };
    
    CAudioEffectBiquad();
    CAudioEffectBiquad(float fSampleRateInHz, int iNumChannels, FilterType_t filterType = kLowpass, EffectParam_t params[] = NULL, float values[] = NULL, int iNumParams = 0, float fMaxDelayInSec = 5.f);
    ~CAudioEffectBiquad();
 
    Error_t init(float fSampleRateInHz, int iNumChannels, FilterType_t filterType = kLowpass, EffectParam_t params[] = NULL, float values[] = NULL, int iNumParams = 0, float fMaxDelayInSec = 5.f);
    
    Error_t reset();
 
    Error_t setParam(EffectParam_t eParam, float fValue);
    
    float getParam(EffectParam_t eParam);
    
    Error_t setFilterType(FilterType_t eValue);
    
    FilterType_t getFilterType();
 
    Error_t process(float **ppfInputBuffer, float **ppfOutputBuffer, int iNumberOfFrames);
 
private:
    
    Error_t setFilterConstants();  
    
    float m_fCenterFrequencyInHz;  
    float m_fQ;  
    float m_fGain;  
    
    FilterType_t m_eFilterType;  
    float m_fa0;
    float m_fa1;
    float m_fa2;
    float m_fb0;
    float m_fb1;
    float m_fb2;
    
    float * m_fxn1;
    float * m_fxn2;
    float * m_fyn1;
    float * m_fyn2;
    
    CRingBuffer<float>  **m_ppCRingBuffer;  
    float m_fMaxDelayInSamples;  
    float m_fDelayInSamples;  
    
};
 
 
#endif //AUDIOFXFRAMEWORK_AudioEffectBiquad_H