VariablePoleFilter.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "DSP/Filter.h"
 
namespace Audio
{
    enum class EFilterOrder : uint32
    {
        TwoPole = 1,
        FourPole,
        SixPole,
        EightPole,
    };
 
    class FVariablePoleFilter
    {
    public:
        int32 NumFilters = 0;
        int32 NumChannels = 0;
 
 
        EBiquadFilter::Type Type = EBiquadFilter::Lowpass;
        FVariablePoleFilter() {};
 
        SIGNALPROCESSING_API void Init(EFilterOrder InOrder
                  , const float InSampleRate
                  , const int32 InNumChannels
                  , const float InFrequency
                  , const EBiquadFilter::Type InType
                  , const float InBandwidth = 2.f
                  , const float InGain = 0.f);
 
        SIGNALPROCESSING_API void SetParams(const EBiquadFilter::Type InFilterType, const float InCutoffFrequency, const float InBandwidth = 2.f, const float InGain = 0.f);
 
        SIGNALPROCESSING_API void ProcessAudioFrame(const float* InFrame, float* OutFrame);
        SIGNALPROCESSING_API void ProcessAudioBuffer(const float* InFrame, float* OutFrame, const int32 NumSamples);
 
        SIGNALPROCESSING_API void Reset();
 
        const TArray<FBiquadFilter>& GetFilters() const { return Filters; }
 
    private:
        TArray<FBiquadFilter> Filters;
    };
}