File: polygate~.c

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/*************************************************************************** 
 * File: polygate~.c 
 * Auth: Iain Mott [iain.mott@bigpond.com] 
 * Maintainer: Iain Mott [iain.mott@bigpond.com] 
 * Version: Part of motex_1.1.2 
 * Date: January 2001
 * 
 * Description: Pd signal external. Switches between multiple signal inlets  
 * with either linear or equal-power crossfade. Polyphonic and with variable fade rate.
 * See supporting Pd patch: polygate~.pd
 * 
 * Copyright (C) 2001 by Iain Mott [iain.mott@bigpond.com] 
 * 
 * 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, 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, which should be included with this 
 * program, for more details. 
 * 
 ****************************************************************************/ 

#include "m_pd.h"
#include <math.h>
#include <string.h>

#define HALFPI 1.570796327

static t_class *polygate_class;

typedef struct _polygateelement // float outlets - signifying activity status of corresponding signal inlet
{
  t_outlet *e_outlet;
} t_polygateelement;

#define INPUTLIMIT 10
#define LINEAR 0
#define EPOWER 1
#define EPMIN 0 // minimum crossfade time (msec) for epower crossfade (below this epower fades sound too crunchy)
// NB - now set to zero - as new 'equal power' now used doesn't have this problem

#define TIMEUNITPERSEC (32.*441000.)

typedef struct _ip // keeps track of each signal input
{
  int active[INPUTLIMIT]; 
  int counter[INPUTLIMIT];
  double timeoff[INPUTLIMIT];
  float fade[INPUTLIMIT];
  float *in[INPUTLIMIT];
} t_ip;

typedef struct _polygate
{
  t_object x_obj;
  float x_f;
  int choice;
  int lastchoice;
  int actuallastchoice;
  int ninlets;
  int fadetime;
  double changetime;
  int fadecount;
  int fadeticks;
  int firsttick;
  int fadetype;
  int lastfadetype;
  int fadealert; 
  float srate;
  t_polygateelement *x_vec;
  t_ip ip;
} t_polygate;

static void *polygate_new(t_symbol *s, int argc, t_atom *argv)
{
  int usedefault = 0, i;
  t_polygateelement *e, *b;
  t_polygate *x = (t_polygate *)pd_new(polygate_class);
  x->srate = sys_getsr();	
  if(argc == 0 || argc > 3)
    usedefault = 1;
  else if(argc == 1 && argv[0].a_type != A_FLOAT)
    usedefault = 1;
  else if(argc >= 2)
    if(argv[0].a_type != A_FLOAT || argv[1].a_type != A_FLOAT)
      usedefault = 1;  
  if(argc == 3)
    {
      if(argv[2].a_type == A_SYMBOL && !strcmp(argv[2].a_w.w_symbol->s_name, "linear"))
	x->fadetype = x->lastfadetype = LINEAR;
      else
	if(argv[1].a_w.w_float >= EPMIN)
	  {
	    post("polygate~: 3rd optional argument should be \"linear\". Reverting to equal power default");
	    x->fadetype = x->lastfadetype = EPOWER;
	  }  
	else
	  {
	    post("polygate~: 3rd optional argument should be \"linear\". \nFade rate less than %d msec - using linear fading", EPMIN);
	    x->fadetype = x->lastfadetype = LINEAR;
	  }
    }
  else
    {
      if(argv[1].a_w.w_float >= EPMIN)
	x->fadetype = x->lastfadetype = EPOWER;
      else
	{
	  post("polygate~: fade rate less than %d msec - using linear fading", EPMIN);
	  x->fadetype = x->lastfadetype = LINEAR;
	}
    }
  if(usedefault)
    {
      post("polygate~: Incompatible arguments. Using base defaults");
      x->fadetype = x->lastfadetype = LINEAR;
      x->ninlets = 1;
      x->fadetime = 1;
    } 
  else
    {
      x->ninlets = argv[0].a_w.w_float < 1 ? 1 : argv[0].a_w.w_float;
      if(x->ninlets > INPUTLIMIT)
	{
	  x->ninlets = INPUTLIMIT;
	  post("polygate~: maximum of %d inlets", INPUTLIMIT);
	}
      x->fadetime = argv[1].a_w.w_float > 0 ? argv[1].a_w.w_float : 1;
    }
  x->x_vec = (t_polygateelement *)getbytes(x->ninlets * sizeof(*x->x_vec));
  for(i = 0; i < x->ninlets - 1; i++)
    inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
  outlet_new(&x->x_obj, gensym("signal"));
  for (i = 0, e = x->x_vec; i < x->ninlets; i++, e++)
    e->e_outlet = outlet_new(&x->x_obj, &s_float);
  x->choice = 0; x->lastchoice = x->actuallastchoice = 0;
  x->fadecount = 0;
  x->fadeticks = (int)(x->srate / 1000 * x->fadetime); // no. of ticks to reach specified fade 'rate'
  x->firsttick = 1;
  x->fadealert = 0;
  x->x_f = 0;
  for(i = 0; i < INPUTLIMIT; i++) 
    {
      x->ip.active[i] = 0;
      x->ip.counter[i] = 0;
      x->ip.timeoff[i] = 0;
      x->ip.fade[i] = 0;
    }
  return (x);
}

static void adjustcounters2epower(t_polygate *x);
static void adjustcounters2linear(t_polygate *x);

void polygate_f(t_polygate *x, t_floatarg f)
{
  f = (int)f;
  f = f > x->ninlets ? x->ninlets : f;
  f = f < 0 ? 0 : f;
  if(f != x->lastchoice)
    {
      t_polygateelement *e;
      if(f == x->actuallastchoice)
	x->fadecount = x->fadeticks - x->fadecount;
      else
	x->fadecount = 0;	
      x->choice = f;
      if(x->choice)
	{
	  e = x->x_vec;
	  e += x->choice - 1;
	  outlet_float(e->e_outlet, 1);
	  x->ip.active[x->choice - 1] = 1;
/*  	  if(x->fadealert) */
/*  	    { */
/*  	      x->fadealert = 0; */
/*  	      adjustcounters2epower(x); */
/*  	    }  */
	}
      if(x->lastchoice)
	{
	  x->ip.active[x->lastchoice - 1] = 0;
	  x->ip.timeoff[x->lastchoice - 1] = clock_getlogicaltime();
	}
/*        else if(x->fadetype) // changing from zero as equal power */
/*  	{ */
/*  	  //	  x->fadealert = 1; */
/*  	      adjustcounters2epower(x); */
/*  	} */
/*        if(!x->choice && x->fadetype && x->actuallastchoice) */
/*  	adjustcounters2linear(x); */
      x->actuallastchoice = x->lastchoice;
      x->lastchoice = x->choice;
    }
}


static void checkswitchstatus(t_polygate *x) // checks to see which input feeds ought to be "switch~"ed off 
{
  int i;
  t_polygateelement *e;
  for(i = 0; i < x->ninlets; i++)
    {
      if(!x->ip.active[i])
	if(clock_gettimesince(x->ip.timeoff[i]) > x->fadetime 
	   && x->ip.timeoff[i])
	  {
	    e = x->x_vec;
	    e += i;
	    x->ip.timeoff[i] = 0;
	    outlet_float(e->e_outlet, 0);
	    x->ip.fade[i] = 0;
	  }	 
    }
}

static void updatefades(t_polygate *x)
{
  int i;
  for(i = 0; i < x->ninlets; i++)
    {
      if(!x->ip.counter[i])
	x->ip.fade[i] = 0;
      if(x->ip.active[i] && x->ip.counter[i] < x->fadeticks)
	{
	  if(x->ip.counter[i])
	    x->ip.fade[i] = x->ip.counter[i] / (float)x->fadeticks;
	  x->ip.counter[i]++;
	}
      else if (!x->ip.active[i] && x->ip.counter[i] > 0)
	{
	  x->ip.fade[i] = x->ip.counter[i] / (float)x->fadeticks;
	  x->ip.counter[i]--;
	}
    }
}

static double epower(double rate)
{
  double tmp;
  if(rate < 0)
    rate = 0;
  if(rate > 0.999)
    rate = 0.999;
/*    tmp = (tan(1.5866 * rate - 0.785398) + 1) / 2; */

/*    tmp = pow(rate, 0.5); */
 rate *= HALFPI;
/*   tmp = sin(HALFPI - rate); */
 tmp = cos(rate - HALFPI);
  tmp = tmp < 0 ? 0 : tmp;
  tmp = tmp > 1 ? 1 : tmp;
/*    return sqrt(tmp); */
  return tmp;
}

static double aepower(double ep) // convert from equal power to linear rate
{
/*    double answer = (atan(2*ep*ep - 1) + 0.785398) / 1.5866; */
  double answer = (acos(ep) + HALFPI) / HALFPI;

  answer = 2 - answer;   // ??? - but does the trick

  answer = answer < 0 ? 0 : answer;
  answer = answer > 1 ? 1 : answer;
  return answer;
}

static void adjustcounters2epower(t_polygate *x) // no longer used
{
  // called when shifting from a linear fade-in (from zero) to an equal power crossfade
  // adjusts each input counter to smoothly match subsequent equal power scalings
  int i;
  double ep;
  for(i = 0; i < x->ninlets; i++)
    {
      ep = x->ip.counter[i] / (double)x->fadeticks;
      x->ip.counter[i] = aepower(ep) * (double)x->fadeticks;
    }
}

static void adjustcounters2linear(t_polygate *x) // no longer used
{
  // opposite of above
  int i;
  double rate;
  for(i = 0; i < x->ninlets; i++)
    {
      rate = x->ip.counter[i] / (double)x->fadeticks;
      x->ip.counter[i] = epower(rate) * (double)x->fadeticks;
    }
}

static void outputfades(t_int *w, int flag)
{
  t_polygate *x = (t_polygate *)(w[1]);
  float *out = (t_float *)(w[3+x->ninlets]);
  int n = (int)(w[2]);
  int i;
  for(i = 0; i < x->ninlets; i++)
    x->ip.in[i] = (t_float *)(w[3+i]);
  while (n--)
    {
      float sum = 0;
      updatefades(x);
      for(i = 0; i < x->ninlets; i++)
	if(x->ip.fade[i])
	  {
	    if(flag && x->fadetype == EPOWER)
	      sum += *x->ip.in[i]++ * epower(x->ip.fade[i]);
	    else
	      sum += *x->ip.in[i]++ * x->ip.fade[i];
	  }
      *out++ = sum;
    }
}

static t_int *polygate_perform(t_int *w)
{
  t_polygate *x = (t_polygate *)(w[1]);
  int n = (int)(w[2]);
  t_polygateelement *e;
  float *out = (t_float *)(w[3+x->ninlets]);
  if (x->actuallastchoice == 0 && x->choice == 0 && x->lastchoice == 0) // initial state
    {
      if(x->firsttick)
	{
	  int i;
	  for (i = 0, e = x->x_vec; i < x->ninlets; i++, e++)
	    outlet_float(e->e_outlet, 0);
	  x->firsttick = 0;
	}
      while (n--)
	*out++ = 0;
    }
  else if (x->actuallastchoice == 0 && x->choice != 0) // change from zero state to non-zero
/*      outputfades(w, LINEAR); */
    outputfades(w, x->fadetype);
  else if(x->choice != 0) // change from non-zero to a different non-zero
    outputfades(w, EPOWER);
  else if (x->actuallastchoice != 0 && x->choice == 0) // change to zero state from non-zero
/*      outputfades(w, LINEAR); */
    outputfades(w, x->fadetype);
  checkswitchstatus(x);
  return (w+4+x->ninlets);
}

static void polygate_dsp(t_polygate *x, t_signal **sp)
{
  int n = sp[0]->s_n, i;
  // must be a smarter way....
  switch (x->ninlets) 
    {
    case 1: dsp_add(polygate_perform, 4, x, n, sp[0]->s_vec, sp[1]->s_vec);
      break;
    case 2: dsp_add(polygate_perform, 5, x, n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec);
      break;
    case 3: dsp_add(polygate_perform, 6, x, n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec);
      break;
    case 4: dsp_add(polygate_perform, 7, x, n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec, sp[4]->s_vec);
      break;
    case 5: dsp_add(polygate_perform, 8, x, n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec, sp[4]->s_vec, sp[5]->s_vec);
      break;
    case 6: dsp_add(polygate_perform, 9, x, n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec, sp[4]->s_vec, sp[5]->s_vec, sp[6]->s_vec);
      break;
    case 7: dsp_add(polygate_perform, 10, x, n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, sp[3]->s_vec, sp[4]->s_vec, sp[5]->s_vec, sp[6]->s_vec, sp[7]->s_vec);
      break;
    case 8: dsp_add(polygate_perform, 11, x, n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, 
		    sp[3]->s_vec, sp[4]->s_vec, sp[5]->s_vec, sp[6]->s_vec, sp[7]->s_vec, sp[8]->s_vec);
    break;
    case 9: dsp_add(polygate_perform, 12, x, n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, 
		    sp[3]->s_vec, sp[4]->s_vec, sp[5]->s_vec, sp[6]->s_vec, sp[7]->s_vec, sp[8]->s_vec, sp[9]->s_vec);
    break;
    case 10: dsp_add(polygate_perform, 13, x, n, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, 
		     sp[3]->s_vec, sp[4]->s_vec, sp[5]->s_vec, sp[6]->s_vec, sp[7]->s_vec, sp[8]->s_vec, sp[9]->s_vec, sp[10]->s_vec);
    break;
    }
}

static void polygate_free(t_polygate *x)
{
  freebytes(x->x_vec, x->ninlets * sizeof(*x->x_vec));
}

static void shortcheck(t_polygate *x, int newticks, int shorter)
{
  int i;
  for(i = 0; i < x->ninlets; i++)
    {
      if(shorter && x->ip.timeoff[i]) // correct active timeoffs for new x->fadeticks (newticks)
	x->ip.timeoff[i] = clock_getlogicaltime() - ((newticks - x->ip.counter[i]) / (x->srate / 1000.) - 1) * (TIMEUNITPERSEC / 1000.);
    }
}
static void adjustcounters_ftimechange(t_polygate *x, int newticks, int shorter)
{
  int i;
  shortcheck(x, newticks, shorter);
  for(i = 0; i < x->ninlets; i++)
    {
/*        if(shorter && x->ip.timeoff[i]) // correct active timeoffs for new x->fadeticks (newticks) */
/*  	x->ip.timeoff[i] = clock_getlogicaltime() - (newticks - x->ip.counter[i]) / (x->srate / 1000.) * (TIMEUNITPERSEC / 1000.); */
      if(x->ip.counter[i])
	x->ip.counter[i] = x->ip.fade[i] * (float)newticks;


/*  	post("x->ip.fade[i] = %f", x->ip.fade[i]); */
/*  	updatefades(x); */
/*  	x->ip.fade[i] = x->ip.counter[i] / (float)x->fadeticks; */
    }
}

void polygate_ftimeepower(t_polygate *x, t_floatarg ftime)
{
  int newticks, i, shorter;
  ftime = ftime < 1 ? 1 : ftime;
  shorter = ftime < x->fadetime ? 1 : 0;
  x->fadetime = (int)ftime;
  newticks = (int)(x->srate / 1000 * x->fadetime); // no. of ticks to reach specified fade time
  x->fadeticks = newticks;
  if(ftime < EPMIN)
    {
      // NB - if we change to linear as a tone is fading out ----> click
      if(x->lastfadetype != LINEAR) // change to linear
	{
	  shortcheck(x, x->fadeticks, shorter);
	  for(i = 0; i < x->ninlets; i++)
	    {
	      if(x->ip.counter[i])
		{
		  float fade = x->ip.fade[i];
		  int oldcounter = x->ip.counter[i];
		  x->ip.counter[i] = epower(fade) * x->fadeticks;
/*  		  post("%d fade = %f : epower = %f : oldcounter = %d : new = %d : newfade = %f",  */
/*  		       i, fade, epower(fade), oldcounter, x->ip.counter[i], ( x->ip.counter[i]/ (float)x->fadeticks)); */
		  x->ip.fade[i] = x->ip.counter[i]/ (float)x->fadeticks; // ???
		}
	    }
	  }
      else // plain fade-time change - linear
	adjustcounters_ftimechange(x, x->fadeticks, shorter);
      x->lastfadetype = x->fadetype = LINEAR;
    }
  else 
    {
      if(x->lastfadetype != EPOWER) // change to equal power
	for(i = 0; i < x->ninlets; i++)
	  {
	    if(x->ip.counter[i])
	      {
		float fade = x->ip.fade[i];
		int oldcounter = x->ip.counter[i];
		x->ip.counter[i] = aepower(fade) * x->fadeticks;
/*  		post("%d fade = %f : oldcounter = %d : new = %d : epower = %f",  */
/*  		     i, fade, oldcounter, x->ip.counter[i], epower( x->ip.counter[i]/ (float)x->fadeticks)); */
		x->ip.fade[i] = epower(x->ip.counter[i]/ (float)x->fadeticks); // ???
	      }
	  }
      else // plain fade-time change - equal power
	adjustcounters_ftimechange(x, x->fadeticks, shorter);
      x->lastfadetype = x->fadetype = EPOWER;
    }
}

static void polygate_ftimelinear(t_polygate *x, t_floatarg ftime)
{
  int newticks, i, shorter;	
  ftime = ftime < 1 ? 1 : ftime;
  shorter = ftime < x->fadetime ? 1 : 0;
  x->fadetime = (int)ftime;
  newticks = (int)(x->srate / 1000 * x->fadetime); 
  x->fadeticks = newticks;
  if(x->lastfadetype != LINEAR)
    {
      shortcheck(x, x->fadeticks, shorter); 
      for(i = 0; i < x->ninlets; i++)
	{
/*  	  float fade = x->ip.fade[i]; */
/*  	  x->ip.counter[i] = aepower(fade) * (float)newticks; */
	  float fade = x->ip.fade[i];
	  int oldcounter = x->ip.counter[i];
	  x->ip.counter[i] = epower(fade) * x->fadeticks;
	  //	  post("%d fade = %f : epower = %f : oldcounter = %d : new = %d : newfade = %f", 
	  //   i, fade, epower(fade), oldcounter, x->ip.counter[i], ( x->ip.counter[i]/ (float)x->fadeticks));
	  x->ip.fade[i] = x->ip.counter[i]/ (float)x->fadeticks; // ???

	}
    }
  else
    adjustcounters_ftimechange(x, newticks, shorter);
  x->lastfadetype = x->fadetype = LINEAR;
}

void polygate_tilde_setup(void)
{
  polygate_class = class_new(gensym("polygate~"), (t_newmethod)polygate_new, (t_method)polygate_free,
			     sizeof(t_polygate), 0, A_GIMME, 0);
  class_addmethod(polygate_class, nullfn, gensym("signal"), 0);
  class_addmethod(polygate_class, (t_method)polygate_dsp, gensym("dsp"), 0);
  CLASS_MAINSIGNALIN(polygate_class, t_polygate, x_f);
  class_addmethod(polygate_class, (t_method)polygate_f, gensym("choice"), A_FLOAT, 0);  
  class_addmethod(polygate_class, (t_method)polygate_ftimeepower, gensym("ftime-epower"), A_FLOAT, (t_atomtype) 0);
  class_addmethod(polygate_class, (t_method)polygate_ftimelinear, gensym("ftime-linear"), A_FLOAT, (t_atomtype) 0);
}