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Phaser.h

/*
      Phaser.h
      
      Copyright 2002-4 Tim Goetze <tim@quitte.de>
      
      http://quitte.de/dsp/

      standard phaser unit.

*/
/*
      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., 59 Temple Place - Suite 330, Boston, MA
      02111-1307, USA or point your web browser to http://www.gnu.org.
*/

#ifndef _PHASER_H_
#define _PHASER_H_

#include "dsp/Sine.h"
#include "dsp/Delay.h"

/* all-pass as used by the phaser. */
class PhaserAP
{
      public:
            d_sample a, m;
            
            PhaserAP() 
            { 
                  a = m = 0.; 
            }

            void set (double delay)
            {
                  a = (1 - delay) / (1 + delay);
            }

            d_sample process (d_sample x)
            {
                  register d_sample y = -a * x + m;
                  m = a * y + x;

                  return y;
            }
};

class Phaser
{
      public:
            double fs;

            PhaserAP ap[6];
            DSP::Sine lfo;

            d_sample rate;
            d_sample y0;

            struct {
                  double bottom, range;
            } delay;

            template <sample_func_t>
            void one_cycle (int frames);
      
            int blocksize, remain;

      public:
            d_sample * ports [6];

            static PortInfo port_info [];
            d_sample adding_gain;

            void init (double _fs)
                  {
                        fs = _fs;
                        blocksize = 32;
                  }

            void activate()
                  {
                        y0 = 0.;
                        remain = 0;

                        delay.bottom = 400. / fs;
                        delay.range = 2200. / fs;

                        rate = -1; /* force lfo reset in one_cycle() */
                  }

            void run (int n)
                  {
                        one_cycle<store_func> (n);
                  }
            
            void run_adding (int n)
                  {
                        one_cycle<adding_func> (n);
                  }
};

#endif /* _PHASER_H_ */

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