cq/CQInverse.h

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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
/*
    Constant-Q library
    Copyright (c) 2013-2014 Queen Mary, University of London

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#ifndef CQINVERSE_H
#define CQINVERSE_H

#include "CQBase.h"
#include "CQKernel.h"

class Resampler;
class FFTReal;

class CQInverse : public CQBase
{
public:
    CQInverse(CQParameters params);
    virtual ~CQInverse();

    // CQBase methods, see CQBase.h for documentation
    virtual bool isValid() const { return m_kernel && m_kernel->isValid(); }
    virtual double getSampleRate() const { return m_sampleRate; }
    virtual int getBinsPerOctave() const { return m_binsPerOctave; }
    virtual int getOctaves() const { return m_octaves; }
    virtual int getTotalBins() const { return m_octaves * m_binsPerOctave; }
    virtual int getColumnHop() const { return m_p.fftHop / m_p.atomsPerFrame; }
    virtual int getLatency() const { return m_outputLatency; } 
    virtual double getMaxFrequency() const { return m_p.maxFrequency; }
    virtual double getMinFrequency() const; // actual min, not that passed to ctor
    virtual double getBinFrequency(double bin) const;

    RealSequence process(const ComplexBlock &);

    RealSequence getRemainingOutput();

private:
    const CQParameters m_inparams;
    const double m_sampleRate;
    const double m_maxFrequency;
    const double m_minFrequency;
    const int m_binsPerOctave;

    int m_octaves;
    CQKernel *m_kernel;
    CQKernel::Properties m_p;

    std::vector<Resampler *> m_upsamplers;
    std::vector<RealSequence> m_buffers;
    std::vector<RealSequence> m_olaBufs; // fixed-length, for overlap-add
    
    int m_outputLatency;

    FFTReal *m_fft;
    
    void initialise();
    void processOctave(int octave, const ComplexBlock &block);
    void processOctaveColumn(int octave, const ComplexColumn &column);
    void overlapAddAndResample(int octave, const RealSequence &);
    RealSequence drawFromBuffers();
};

#endif