InterpolatedMultiTapDelay.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "AlignedBuffer.h"
#include "VectorLinearResampler.h"
 
namespace Audio
{
    class FInterpolatedMultiTapDelay
    {
    public:
        FInterpolatedMultiTapDelay() = default;
        
        SIGNALPROCESSING_API void Init(const int32 InDelayBufferSamples);
 
        SIGNALPROCESSING_API void Advance(TArrayView<const float> InBuffer);
 
        // Read and interpolate a variable number of samples back in the delay line
        // return a fixed-point representation of fraction of the last sample, which should be passed as StartSampleFraction on successive reads for that tap.
        SIGNALPROCESSING_API uint32 Read(const uint32 StartNumDelaySamples, const uint32 StartSampleFraction, const uint32 EndNumDelaySamples, TArrayView<float> OutBuffer);
        SIGNALPROCESSING_API void Reset();
        SIGNALPROCESSING_API bool IsInitialized() const;
 
    private:
        int32 WriteIndex = 0;
 
        FAlignedFloatBuffer DelayLine;
        FAlignedFloatBuffer WrapBuffer;
        FVectorLinearResampler Resampler;
    };  
}