// ------------------------------------------------------------------------
//
//  Copyright (C) 2010-2011 Fons Adriaensen <fons@linuxaudio.org>
//    
//  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., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// ------------------------------------------------------------------------


#ifndef _EBU_R128_PROC_H
#define _EBU_R128_PROC_H

#define MAXCH 5

namespace Fons {

class Ebu_r128_fst
{
private:

    friend class Ebu_r128_proc;

    void reset (void) { _z1 = _z2 = _z3 = _z4 = 0; }

    float _z1, _z2, _z3, _z4;
};


class Ebu_r128_hist
{
private:

    Ebu_r128_hist (void);
    ~Ebu_r128_hist (void);

    friend class Ebu_r128_proc;

    void  reset (void);
    void  initstat (void);
    void  addpoint (float v);
    float integrate (int ind);
    void  calc_integ (float *vi, float *th);
    void  calc_range (float *v0, float *v1, float *th);

    int  *_histc;
    int   _count;
    int   _error;

    static float _bin_power [100];
};



class Ebu_r128_proc
{
public:

    Ebu_r128_proc (void);
    ~Ebu_r128_proc (void);

    void  init (int nchan, float fsamp);
    void  reset (void);
    void  process (int nfram, const float *const *input);
    void  integr_reset (void);
    void  integr_pause (void) { _integr = false; }
    void  integr_start (void) { _integr = true; }

    float loudness_M (void) const { return _loudness_M; }
    float maxloudn_M (void) const { return _maxloudn_M; }
    float loudness_S (void) const { return _loudness_S; }
    float maxloudn_S (void) const { return _maxloudn_S; }
    float integrated (void) const { return _integrated; }
    float integ_thr (void) const { return _integ_thr; }
    float range_min (void) const { return _range_min; }
    float range_max (void) const { return _range_max; }
    float range_thr (void) const { return _range_thr; }

    const int *histogram_M (void) const { return _hist_M._histc; }
    const int *histogram_S (void) const { return _hist_S._histc; }
    int hist_M_count (void) const { return _hist_M._count; }
    int hist_S_count (void) const { return _hist_S._count; }

private:

    float addfrags (int nfrag);
    void  detect_init (float fsamp);
    void  detect_reset (void);
    float detect_process (int nfram);

    bool              _integr;       // Integration on/off.
    int               _nchan;        // Number of channels, 2 or 5.
    float             _fsamp;        // Sample rate.
    int               _fragm;        // Fragmenst size, 1/20 second.
    int               _frcnt;        // Number of samples remaining in current fragment.
    float             _frpwr;        // Power accumulated for current fragment.
    float             _power [64];   // Array of fragment powers.
    int               _wrind;        // Write index into _frpwr 
    int               _div1;         // M period counter, 200 ms;
    int               _div2;         // S period counter, 1s;
    float             _loudness_M;
    float             _maxloudn_M;
    float             _loudness_S;
    float             _maxloudn_S;
    float             _integrated;
    float             _integ_thr;
    float             _range_min;
    float             _range_max;
    float             _range_thr;
    
    // Filter coefficients and states.
    float             _a0, _a1, _a2;
    float             _b1, _b2;
    float             _c3, _c4;
    float const      *_ipp [MAXCH];
    Ebu_r128_fst      _fst [MAXCH];
    Ebu_r128_hist     _hist_M;
    Ebu_r128_hist     _hist_S;

    // Default channel gains.
    static float      _chan_gain [5];
};

};

#endif