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Sin.cc

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

      simple sin() generator.

*/
/*
      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 "Sin.h"
#include "Descriptor.h"

void
Sin::init (double _fs)
{
      fs = _fs;
      sin.set_f (f = .005, fs, 0);
      gain = 0;
}

template <sample_func_t F>
void
Sin::one_cycle (int frames)
{
      if (f != *ports[0])
            sin.set_f (f = *ports[0], fs, sin.get_phase());

      double g = (gain == *ports[1]) ? 
            1 : pow (*ports[1] / gain, 1. / (double) frames);

      d_sample * d = ports[2];

      for (int i = 0; i < frames; ++i)
      {
            F (d, i, gain * sin.get(), adding_gain);
            gain *= g;
      }

      gain = *ports[1];
}

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

PortInfo
Sin::port_info [] =
{
      {
            "f",
            INPUT | CONTROL,
            {BOUNDED | FS | LOG | DEFAULT_440, 0, .5}
      }, {
            "volume",
            INPUT | CONTROL,
            {BOUNDED | DEFAULT_MID, MIN_GAIN, 1}
      }, {
            "out",
            OUTPUT | AUDIO,
            {0}
      }
};

Descriptor<Sin>::Descriptor<Sin>()
{
      UniqueID = 1781;
      Label = "Sin";
      Properties = HARD_RT;

      Name = "Sine generator";
      Maker = "Tim Goetze <tim@quitte.de>";
      Copyright = "GPL, 2004";

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


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