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Phaser.cc

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

      simple mono phaser, 6 all-pass lines, the usual controls.

*/
/*
      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.
*/

#include "basics.h"

#include "Phaser.h"
#include "Descriptor.h"

template <sample_func_t F>
void
Phaser::one_cycle (int frames)
{
      d_sample * s = ports[0];

      if (rate != *ports[1])
      {
            rate = *ports[1];
            lfo.set_f (max (.001, rate * (double) blocksize), fs, lfo.get_phase());
      }

      double depth = *ports[2];
      double spread = 1 + *ports[3];
      double fb = *ports[4];

      d_sample * dst = ports[5];

      while (frames)
      {
            if (remain == 0) remain = 32;

            int n = min (remain, frames);

            double d = delay.bottom + delay.range * (1. - fabs (lfo.get()));

            for (int j = 5; j >= 0; --j)
            {
                  ap[j].set (d);
                  d *= spread;
            }
            
            for (int i = 0; i < n; ++i)
            {
                  d_sample x = s[i];
                  d_sample y = x + y0 * fb;

                  for (int j = 5; j >= 0; --j)
                        y = ap[j].process (y);
                  
                  y0 = y;

                  F (dst, i, x + y * depth, adding_gain);
            }

            s += n;
            dst += n;
            frames -= n;
            remain -= n;
      }
}

/* //////////////////////////////////////////////////////////////////////// */

PortInfo
Phaser::port_info [] =
{
      {
            "in",
            INPUT | AUDIO,
            {BOUNDED, -1, 1}
      }, {
            "rate (Hz)",
            INPUT | CONTROL,
            {BOUNDED | DEFAULT_1, 0, 10}
      }, {
            "depth",
            INPUT | CONTROL,
            {BOUNDED | DEFAULT_HIGH, 0, 1}
      }, {
            "spread",
            INPUT | CONTROL,
            {BOUNDED | DEFAULT_LOW, 0, M_PI}
      }, {
            "feedback",
            INPUT | CONTROL,
            {BOUNDED | DEFAULT_HIGH, 0, .999}
      }, {
            "out",
            OUTPUT | AUDIO,
            {0}
      }
};

Descriptor<Phaser>::Descriptor<Phaser>()
{
      UniqueID = 1775;
      Label = "Phaser";
      Properties = HARD_RT;

      Name = "Mono phaser";
      Maker = "Tim Goetze <tim@quitte.de>";
      Copyright = "GPL, 2002-4";

      /* fill port info and vtable */
      autogen();
}


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