FFTConvolver.h

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// ==================================================================================
// Copyright (c) 2017 HiFi-LoFi
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
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// to do so, subject to the following conditions:
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// ==================================================================================
namespace fftconvolver
{
 
    class FFTConvolver
    {
      public:
        FFTConvolver();
        virtual ~FFTConvolver();
 
        bool init(size_t blockSize, const Sample* ir, size_t irLen);
 
        void process(const Sample* input, Sample* output, size_t len);
 
        void reset();
 
      private:
        size_t _blockSize;
        size_t _segSize;
        size_t _segCount;
        size_t _fftComplexSize;
        std::vector<SplitComplex*> _segments;
        std::vector<SplitComplex*> _segmentsIR;
        SampleBuffer _fftBuffer;
        audiofft::AudioFFT _fft;
        SplitComplex _preMultiplied;
        SplitComplex _conv;
        SampleBuffer _overlap;
        size_t _current;
        SampleBuffer _inputBuffer;
        size_t _inputBufferFill;
 
        // Prevent uncontrolled usage
        FFTConvolver(const FFTConvolver&);
        FFTConvolver& operator=(const FFTConvolver&);
    };
 
} // End of namespace fftconvolver