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/* -------------------------- history ----------------------------------------- */
/* */
/* Calculates the average value of the elements within the last N seconds. */
/* Written by Olaf Matthes (olaf.matthes@gmx.de) */
/* Get source at http://www.akustische-kunst.org/puredata/maxlib/ */
/* */
/* 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. */
/* */
/* Based on PureData by Miller Puckette and others. */
/* */
/* ---------------------------------------------------------------------------- */
#include "m_pd.h"
#include <math.h>
#define MAX_ARG 1024 /* maximum number of items to average */
#define MAX_TIME 60000 /* maximum time to look back */
static char *version = "history v0.1, written by Olaf Matthes <olaf.matthes@gmx.de>";
typedef struct history
{
t_object x_ob;
t_clock *x_clock;
t_inlet *x_inindex;
t_outlet *x_outfloat; /* output the history */
t_outlet *x_outtendency; /* outputs the tendency of the average */
t_int x_limit; /* indicates if input is 'blocked' (1) */
t_int x_index; /* the number of elements to average */
t_float x_input[MAX_ARG]; /* stores the input values we need for averaging */
double x_intime[MAX_ARG]; /* stores the time of arrival of an element */
t_int x_inpointer; /* actual position in above array */
t_float x_average; /* what do you guess ? */
t_float x_lastaverage;
t_int x_mode; /* how to history: linear or geometric */
t_int x_time;
} t_history;
/* there must be a function for this in math.h but how is the
german 'Fakultät' called in english ???? */
static int normalise(int i)
{
int ret = i;
while(i--)
{
if(i == 0)break;
ret += i;
}
return (ret);
}
static void history_tick(t_history *x)
{
t_float tendency = 0.0;
if(x->x_lastaverage < x->x_average)
{
tendency = 1.0; /* getting more */
}
else if(x->x_lastaverage > x->x_average)
{
tendency = -1.0; /* getting less */
}
else tendency = 0.0; /* nothing has changed */
outlet_float(x->x_outtendency, tendency);
x->x_lastaverage = x->x_average;
clock_delay(x->x_clock, x->x_time);
}
static void history_float(t_history *x, t_floatarg f)
{
int i, j = 0, k = 0, l;
t_float geo = 1.0;
x->x_average = 0;
/* put value into array */
x->x_input[x->x_inpointer] = f;
x->x_intime[x->x_inpointer] = clock_getlogicaltime();
/* look for elements that are too old */
x->x_index = 0;
for(i = 0; i < MAX_ARG; i++) /* check all valid elements */
{
if(x->x_intime[i] != 0)
{
if(clock_gettimesince(x->x_intime[i]) <= x->x_time) /* it's in our time window */
{
x->x_index++; /* count valid entries */
}
else /* too old, delete entry */
{
x->x_intime[i] = 0;
}
}
}
if(x->x_index > 1)
{
/* calulate history */
for(i = 0; i < MAX_ARG; i++) /* check all valid elements */
{
if(x->x_intime[i] != 0) /* it's a valid entry */
{
k++;
l = MAX_ARG;
if(x->x_mode == 0) /* linear */
{
x->x_average += x->x_input[i] * (1.0 / (float)x->x_index);
}
else if(x->x_mode == 1) /* geometric */
{
if(x->x_input[i] == 0)x->x_input[i] = 0.001; /* need to cheat a bit... */
geo *= x->x_input[i];
if(k == x->x_index)
x->x_average = pow(geo, (1.0/(float)x->x_index));
}
else if(x->x_mode == 2) /* weighted */
{
/* normalise output */
if(k == x->x_index)
{
x->x_average += x->x_input[(j + x->x_inpointer + MAX_ARG) % MAX_ARG] * (float)(x->x_index - k);
x->x_average = x->x_average / (float)normalise(x->x_index - 1);
}
else
{
x->x_average += x->x_input[(j + x->x_inpointer + MAX_ARG) % MAX_ARG] * (float)(x->x_index - k);
j--; /* go back in array */
while(l--) /* check if this will result in a valid value */
{
if(x->x_intime[(j + x->x_inpointer + MAX_ARG) % MAX_ARG] == 0)
{
j--; /* go back more if necessary */
}
else break; /* finished on first non-zero */
}
}
} else post("history: internal error!");
}
}
}
else x->x_average = x->x_input[x->x_inpointer];
if(++x->x_inpointer > MAX_ARG)
{
x->x_inpointer = 0;
}
outlet_float(x->x_outfloat, x->x_average);
}
static void history_time(t_history *x, t_floatarg f)
{
x->x_time = (t_int)f;
if(x->x_time < 1) x->x_time = 1;
if(x->x_time > MAX_TIME)x->x_time = MAX_TIME;
clock_unset(x->x_clock);
clock_delay(x->x_clock, 0);
}
static void history_reset(t_history *x)
{
int i;
/* zeroe out the array */
for(i = 0; i < MAX_ARG; i++)
{
x->x_input[i] = 0.0;
x->x_intime[i] = 0.0;
}
x->x_index = 0;
x->x_inpointer = 0;
x->x_average = 0;
x->x_lastaverage = 0;
post("history: reset");
}
static void history_linear(t_history *x)
{
x->x_mode = 0;
post("history: linear");
}
static void history_geometric(t_history *x)
{
x->x_mode = 1;
post("history: geometric");
}
static void history_weight(t_history *x)
{
x->x_mode = 2;
post("history: weighted");
}
static void history_free(t_history *x)
{
clock_free(x->x_clock);
}
static t_class *history_class;
static void *history_new(t_floatarg f)
{
int i;
t_history *x = (t_history *)pd_new(history_class);
x->x_inindex = inlet_new(&x->x_ob, &x->x_ob.ob_pd, gensym("float"), gensym("time"));
x->x_outfloat = outlet_new(&x->x_ob, gensym("float"));
x->x_outtendency = outlet_new(&x->x_ob, gensym("float"));
x->x_clock = clock_new(x, (t_method)history_tick);
/* zeroe out the array */
for(i = 0; i < MAX_ARG; i++)
{
x->x_input[i] = 0.0;
x->x_intime[i] = 0.0;
}
x->x_time = (t_int)f;
if(x->x_time < 1) x->x_time = 1;
if(x->x_time > MAX_TIME)
{
x->x_time = MAX_TIME;
post("history: set number time to %d", x->x_time);
}
x->x_index = 0;
x->x_inpointer = 0;
x->x_average = 0;
x->x_mode = 0;
clock_delay(x->x_clock, 0);
return (void *)x;
}
#ifndef MAXLIB
void history_setup(void)
{
history_class = class_new(gensym("history"), (t_newmethod)history_new,
(t_method)history_free, sizeof(t_history), 0, A_DEFFLOAT, 0);
class_addmethod(history_class, (t_method)history_reset, gensym("reset"), 0);
class_addmethod(history_class, (t_method)history_linear, gensym("linear"), 0);
class_addmethod(history_class, (t_method)history_geometric, gensym("geometric"), 0);
class_addmethod(history_class, (t_method)history_weight, gensym("weight"), 0);
class_addfloat(history_class, history_float);
class_addmethod(history_class, (t_method)history_time, gensym("time"), A_FLOAT, 0);
class_sethelpsymbol(history_class, gensym("help-history.pd"));
post(version);
}
#else
void maxlib_history_setup(void)
{
history_class = class_new(gensym("maxlib_history"), (t_newmethod)history_new,
(t_method)history_free, sizeof(t_history), 0, A_DEFFLOAT, 0);
class_addcreator((t_newmethod)history_new, gensym("history"), A_DEFFLOAT, 0);
class_addmethod(history_class, (t_method)history_reset, gensym("reset"), 0);
class_addmethod(history_class, (t_method)history_linear, gensym("linear"), 0);
class_addmethod(history_class, (t_method)history_geometric, gensym("geometric"), 0);
class_addmethod(history_class, (t_method)history_weight, gensym("weight"), 0);
class_addfloat(history_class, history_float);
class_addmethod(history_class, (t_method)history_time, gensym("time"), A_FLOAT, 0);
class_sethelpsymbol(history_class, gensym("maxlib/help-history.pd"));
}
#endif
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