livetrax/libs/qm-dsp/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.

    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.
*/

#ifndef CDFPROCESS_H
#define CDFPROCESS_H

#include <stdio.h>
#include "FiltFilt.h"

struct DFProcConfig{
    unsigned int length; 
    unsigned int LPOrd; 
    double *LPACoeffs; 
    double *LPBCoeffs; 
    unsigned int winPre;
    unsigned int winPost; 
    double AlphaNormParam;
    bool isMedianPositive;
    float delta; //delta threshold used as an offset when computing the smoothed detection function

    DFProcConfig() :
        length(0),
        LPOrd(0),
        LPACoeffs(NULL),
        LPBCoeffs(NULL),
        winPre(0),
        winPost(0),
        AlphaNormParam(0),
        isMedianPositive(false),
        delta(0)
    {
    }
};

class DFProcess  
{
public:
    DFProcess( DFProcConfig Config );
    virtual ~DFProcess();

    void process( double* src, double* dst );

	
private:
    void initialise( DFProcConfig Config );
    void deInitialise();
    void removeDCNormalize( double *src, double*dst );
    void medianFilter( double* src, double* dst );

    int m_length;
    int m_FFOrd;

    int m_winPre;
    int m_winPost;

    double m_alphaNormParam;

    double* filtSrc;
    double* filtDst;

    double* m_filtScratchIn;
    double* m_filtScratchOut;

    FiltFilt* m_FiltFilt;

    bool m_isMedianPositive;
    float m_delta; //add delta threshold
};

#endif