PeakPicking.h

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/* -*- 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.
 
    Modifications:
 
    - delta threshold
    Description: add delta threshold used as offset in the smoothed
    detection function
    Author: Mathieu Barthet
    Date: June 2010
 
    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.
*/
 
// PeakPicking.h: interface for the PeakPicking class.
//
 
#ifndef PEAKPICKING_H
#define PEAKPICKING_H
 
#include "maths/MathUtilities.h"
#include "maths/MathAliases.h"
#include "dsp/signalconditioning/DFProcess.h"
 
 
struct PPWinThresh
{
    unsigned int pre;
    unsigned int  post;
 
    PPWinThresh(unsigned int x, unsigned int y) :
        pre(x),
        post(y)
    {
    }
};
 
struct QFitThresh
{
    double a;
    double b;
    double c;
 
    QFitThresh(double x, double y, double z) :
        a(x),
        b(y),
        c(z)
    {
    }
};
 
struct PPickParams
{
    unsigned int length; //Detection FunctionLength
    double tau; // time resolution of the detection function
    unsigned int alpha; //alpha-norm parameter
    double cutoff;//low-pass Filter cutoff freq
    unsigned int LPOrd; // low-pass Filter order
    double* LPACoeffs; //low pass Filter den coefficients
    double* LPBCoeffs; //low pass Filter num coefficients
    PPWinThresh WinT;//window size in frames for adaptive thresholding [pre post]:
    QFitThresh QuadThresh;
    float delta; //delta threshold used as an offset when computing the smoothed detection function
 
    PPickParams() :
        length(0),
        tau(0),
        alpha(0),
        cutoff(0),
        LPOrd(0),
        LPACoeffs(NULL),
        LPBCoeffs(NULL),
        WinT(0,0),
        QuadThresh(0,0,0),
        delta(0)
    {
    }
};
 
class PeakPicking  
{
public:
    PeakPicking( PPickParams Config );
    virtual ~PeakPicking();
        
    void process( double* src, unsigned int len, vector<int> &onsets  );
 
 
private:
    void initialise( PPickParams Config  );
    void deInitialise();
    int  quadEval( vector<double> &src, vector<int> &idx );
        
    DFProcConfig m_DFProcessingParams;
 
    unsigned int m_DFLength ;
    double Qfilta ;
    double Qfiltb;
    double Qfiltc;
 
 
    double* m_workBuffer;
        
    DFProcess*  m_DFSmoothing;
};
 
#endif