Chorus.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "DSP/Delay.h"
#include "DSP/LFO.h"
 
namespace Audio
{
    namespace EChorusDelays
    {
        enum Type
        {
            Left,
            Center,
            Right,
            NumDelayTypes
        };
    }
 
    class FChorus
    {
    public:
        SIGNALPROCESSING_API FChorus();
        SIGNALPROCESSING_API ~FChorus();
 
        SIGNALPROCESSING_API void Init(const float InSampleRate, const int32 InNumChannels, const float InDelayLengthSec = 2.0f, const int32 InControlSamplePeriod = 256);
 
        inline int32 GetNumChannels() const
        {
            return NumChannels;
        }
 
        SIGNALPROCESSING_API void SetDepth(const EChorusDelays::Type InType, const float InDepth);
        SIGNALPROCESSING_API void SetFrequency(const EChorusDelays::Type InType, const float InFrequency);
        SIGNALPROCESSING_API void SetFeedback(const EChorusDelays::Type InType, const float InFeedback);
        SIGNALPROCESSING_API void SetWetLevel(const float InWetLevel);
        SIGNALPROCESSING_API void SetDryLevel(const float InDryLevel);
        SIGNALPROCESSING_API void SetSpread(const float InSpread);
        SIGNALPROCESSING_API void ProcessAudioFrame(const float* InFrame, float* OutFrame);
        SIGNALPROCESSING_API void ProcessAudio(const float* InBuffer, const int32 InNumSamples, float* OutBuffer);
 
    protected:
        FDelay Delays[EChorusDelays::NumDelayTypes];
        FLFO LFOs[EChorusDelays::NumDelayTypes];
        FLinearEase Depth[EChorusDelays::NumDelayTypes];
        float Feedback[EChorusDelays::NumDelayTypes];
 
        float MinDelayMsec;
        float MaxDelayMsec;
        float DelayRangeMsec;
        float Spread;
        float MaxFrequencySpread;
        float WetLevel;
        float DryLevel;
        int32 NumChannels;
    };
 
 
}