cq/CQSpectrogram.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

    Permission is hereby granted, free of charge, to any person
    obtaining a copy of this software and associated documentation
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*/

#ifndef CQSPECTROGRAM_H
#define CQSPECTROGRAM_H

#include "ConstantQ.h"

class CQSpectrogram : public CQBase
{
public:
    enum Interpolation {
    InterpolateZeros,
    InterpolateHold,
    InterpolateLinear,
    };

    CQSpectrogram(CQParameters params, Interpolation interpolation);
    virtual ~CQSpectrogram();

    // CQBase methods, see CQBase.h for documentation
    virtual bool isValid() const { return m_cq.isValid(); }
    virtual double getSampleRate() const { return m_cq.getSampleRate(); }
    virtual int getBinsPerOctave() const { return m_cq.getBinsPerOctave(); }
    virtual int getOctaves() const { return m_cq.getOctaves(); }
    virtual int getTotalBins() const { return m_cq.getTotalBins(); }
    virtual int getColumnHop() const { return m_cq.getColumnHop(); }
    virtual int getLatency() const { return m_cq.getLatency(); } 
    virtual double getMaxFrequency() const { return m_cq.getMaxFrequency(); }
    virtual double getMinFrequency() const { return m_cq.getMinFrequency(); }
    virtual double getBinFrequency(double bin) const { return m_cq.getBinFrequency(bin); }

    RealBlock process(const RealSequence &);

    RealBlock getRemainingOutput();

private:
    ConstantQ m_cq;
    Interpolation m_interpolation;

    RealBlock m_buffer;
    RealBlock postProcess(const ComplexBlock &, bool insist);
    RealBlock fetchHold(bool insist);
    RealBlock fetchLinear(bool insist);
    RealBlock linearInterpolated(const RealBlock &, int, int);
    RealColumn m_prevColumn;
};

#endif