IFilter.h

#pragma once
 
#include "../IDsp.h"
#include <memory>
 
class IFilter : public IDsp
{
  public:
    enum Type
    {
        kHighPass,
        kLowPass,
        kLowShelf,
        kHighShelf,
        kPeak,
        kNumTypes
    };
 
    virtual ~IFilter() = default;
 
    virtual void setFrequency(const double frequency) = 0;
    virtual void setGain(const double gaindB) = 0;
    virtual void setQ(const double q) = 0;
    virtual void setSampleRate(const double sampleRate) = 0;
    virtual double filterResponse(double sampleRate, double currentFreq) = 0;
 
    bool isEnabled{true};
 
  private:
};
 
std::unique_ptr<IFilter> createFilter(IFilter::Type filterType, double startFrequency, int filterOrder = 2);