/*  eq.h

This file is part of a program that implements a Software-Defined Radio.

Copyright (C) 2013, 2016 Warren Pratt, NR0V
Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel

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.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

The author can be reached by email at

warren@wpratt.com

*/

/********************************************************************************************************
*                                                                                                       *
*                                           Overlap-Save Equalizer                                      *
*                                                                                                       *
********************************************************************************************************/

#ifndef wdsp_eq_h
#define wdsp_eq_h

#include "fftw3.h"
#include "export.h"

namespace WDSP {

class WDSP_API EQ
{
public:
    int run;
    int size;
    float* in;
    float* out;
    int nfreqs;
    float* F;
    float* G;
    float* infilt;
    float* product;
    float* mults;
    float scale;
    int ctfmode;
    int wintype;
    float samplerate;
    fftwf_plan CFor;
    fftwf_plan CRev;

    static EQ* create_eq (int run, int size, float *in, float *out, int nfreqs, float* F, float* G, int ctfmode, int wintype, int samplerate);
    // static float* eq_mults (int size, int nfreqs, float* F, float* G, float samplerate, float scale, int ctfmode, int wintype);
    static void destroy_eq (EQ *a);
    static void flush_eq (EQ *a);
    static void xeq (EQ *a);
    static void setBuffers_eq (EQ *a, float* in, float* out);
    static void setSamplerate_eq (EQ *a, int rate);
    static void setSize_eq (EQ *a, int size);

private:
    static float* eq_mults (int size, int nfreqs, float* F, float* G, float samplerate, float scale, int ctfmode, int wintype);
    static void calc_eq (EQ *a);
    static void decalc_eq (EQ *a);
};

} // namespace WDSP

#endif