Noise.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Math/RandomStream.h"
 
namespace Audio
{
    class FWhiteNoise
    {
    public:
        SIGNALPROCESSING_API FWhiteNoise();
        SIGNALPROCESSING_API FWhiteNoise(int32 InRandomSeed);
 
        inline float Generate()
        {
            return (RandomStream.FRand() * 2.f) - 1.0f;
        }
        
        inline float Generate(float InScale, float InAdd)
        {
            return Generate() * InScale + InAdd;
        }
    private:    
        FRandomStream RandomStream;
    };
 
    class FPinkNoise
    {
    public:
        SIGNALPROCESSING_API FPinkNoise();
 
        SIGNALPROCESSING_API FPinkNoise(int32 InRandomSeed);
 
        SIGNALPROCESSING_API float Generate();
 
        void SetFilterGain(float InFilterGain) 
        {
            A0 = InFilterGain;
        }
 
    private:
        FWhiteNoise Noise;
        float X_Z[4];
        float Y_Z[4];
        float A0 = 1.f;
    };
}