annotate dsp/chromagram/Chromagram.h @ 321:f1e6be2de9a5

A threshold (delta) is added in the peak picking parameters structure (PPickParams). It is used as an offset when computing the smoothed detection function. A constructor for the structure PPickParams is also added to set the parameters to 0 when a structure instance is created. Hence programmes using the peak picking parameter structure and which do not set the delta parameter (e.g. QM Vamp note onset detector) won't be affected by the modifications.

Functions modified:
- dsp/onsets/PeakPicking.cpp
- dsp/onsets/PeakPicking.h
- dsp/signalconditioning/DFProcess.cpp
- dsp/signalconditioning/DFProcess.h

/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */

/*
    QM DSP Library

    Centre for Digital Music, Queen Mary, University of London.
    This file 2005-2006 Christian Landone.

    This program is free software; you can redistribute it and/or
    modify it under the terms of the GNU General Public License as
    published by the Free Software Foundation; either version 2 of the
    License, or (at your option) any later version.  See the file
    COPYING included with this distribution for more information.
*/

#ifndef CHROMAGRAM_H
#define CHROMAGRAM_H

#include "dsp/transforms/FFT.h"
#include "base/Window.h"
#include "ConstantQ.h"

struct ChromaConfig{
    unsigned int FS;
    double min;
    double max;
    unsigned int BPO;
    double CQThresh;
    MathUtilities::NormaliseType normalise;
};

class Chromagram 
{

public:	
    Chromagram( ChromaConfig Config );
    ~Chromagram();
	
    double* process( const double *data ); // time domain
    double* process( const double *real, const double *imag ); // frequency domain
    void unityNormalise( double* src );

    // Complex arithmetic
    double kabs( double real, double imag );
	
    // Results
    unsigned int getK() { return m_uK;}
    unsigned int getFrameSize() { return m_frameSize; }
    unsigned int getHopSize()   { return m_hopSize; }

private:
    int initialise( ChromaConfig Config );
    int deInitialise();

    Window<double> *m_window;
    double *m_windowbuf;
	
    double* m_chromadata;
    double m_FMin;
    double m_FMax;
    unsigned int m_BPO;
    unsigned int m_uK;

    MathUtilities::NormaliseType m_normalise;

    unsigned int m_frameSize;
    unsigned int m_hopSize;

    FFTReal* m_FFT;
    ConstantQ* m_ConstantQ;

    double* m_FFTRe;
    double* m_FFTIm;
    double* m_CQRe;
    double* m_CQIm;

    bool m_skGenerated;
};

#endif