Decimator.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.

    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 QM_DSP_DECIMATOR_H
#define QM_DSP_DECIMATOR_H

class Decimator  
{
public:
    Decimator(int inLength, int decFactor);
    virtual ~Decimator();

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

    void process( const float* src, float* dst );

    int getFactor() const { return m_decFactor; }
    static int getHighestSupportedFactor() { return 8; }

    void resetFilter();

private:
    void deInitialise();
    void initialise( int inLength, int decFactor );
    void doAntiAlias( const double* src, double* dst, int length );
    void doAntiAlias( const float* src, double* dst, int length );

    int m_inputLength;
    int m_outputLength;
    int m_decFactor;

    double Input;
    double Output ;

    double o1,o2,o3,o4,o5,o6,o7;

    double a[ 9 ];
    double b[ 9 ];
        
    double* decBuffer;
};

#endif //