From 8b0873392ad0db55fdb9d0cdfc670366bc96a9c9 Mon Sep 17 00:00:00 2001 From: Hans-Christoph Steiner Date: Mon, 26 Apr 2010 03:10:47 +0000 Subject: converted maxlib to use libdir template, in preparations for debianizing it svn path=/trunk/externals/maxlib/; revision=13476 --- average.c | 202 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 202 insertions(+) create mode 100644 average.c (limited to 'average.c') diff --git a/average.c b/average.c new file mode 100644 index 0000000..2ce99ad --- /dev/null +++ b/average.c @@ -0,0 +1,202 @@ +/* -------------------------- average ----------------------------------------- */ +/* */ +/* Calculates the average value of the last N elements. */ +/* 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 + +#define MAX_ARG 128 /* maximum number of items to average */ + +static char *version = "average v0.1, written by Olaf Matthes "; + +typedef struct average +{ + t_object x_ob; + t_clock *x_clock; + t_inlet *x_inindex; + t_outlet *x_outfloat; /* output the average */ + 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 */ + 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 average: linear or geometric */ + +} t_average; + + /* 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 average_float(t_average *x, t_floatarg f) +{ + int i, j = 0; + t_float tendency; + t_float geo = 1.0; + + x->x_average = 0; + /* put value into array */ + x->x_input[x->x_inpointer] = f; + /* calulate average */ + for(i = 0; i < x->x_index; i++) + { + 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(i == x->x_index - 1) + x->x_average = pow(geo, (1.0/(float)x->x_index)); + } + else if(x->x_mode == 2) /* weighted */ + { + x->x_average += x->x_input[(j + x->x_inpointer + x->x_index) % x->x_index] * (float)(x->x_index - (i + 1)); + j--; /* go back in array */ + /* normalise output */ + if(i == x->x_index - 1) + x->x_average = x->x_average / (float)normalise(x->x_index - 1); + } else post("average: internal error!"); + } + if(++x->x_inpointer > x->x_index) + { + x->x_inpointer = 0; + if(x->x_lastaverage < x->x_average) + { + tendency = 1; /* getting more */ + } + else if(x->x_lastaverage > x->x_average) + { + tendency = -1; /* getting less */ + } + else tendency = 0; /* nothing has changed */ + outlet_float(x->x_outtendency, tendency); + x->x_lastaverage = x->x_average; + } + outlet_float(x->x_outfloat, x->x_average); +} + +static void average_index(t_average *x, t_floatarg f) +{ + x->x_index = (t_int)f; + if(x->x_index > MAX_ARG)x->x_index = MAX_ARG; +} + +static void average_reset(t_average *x) +{ + int i; + /* zeroe out the array */ + for(i = 0; i < MAX_ARG; i++)x->x_input[i] = 0.0; + x->x_inpointer = 0; + x->x_average = 0; + x->x_lastaverage = 0; + post("average: reset"); +} + +static void average_linear(t_average *x) +{ + x->x_mode = 0; + post("average: linear"); +} + +static void average_geometric(t_average *x) +{ + x->x_mode = 1; + post("average: geometric"); +} + +static void average_weight(t_average *x) +{ + x->x_mode = 2; + post("average: weighted"); +} + +static void average_free(t_average *x) +{ + /* nothing to do */ +} + +static t_class *average_class; + +static void *average_new(t_floatarg f) +{ + int i; + + t_average *x = (t_average *)pd_new(average_class); + x->x_inindex = inlet_new(&x->x_ob, &x->x_ob.ob_pd, gensym("float"), gensym("index")); + x->x_outfloat = outlet_new(&x->x_ob, gensym("float")); + x->x_outtendency = outlet_new(&x->x_ob, gensym("float")); + + /* zeroe out the array */ + for(i = 0; i < MAX_ARG; i++)x->x_input[i] = 0.0; + x->x_index = (t_int)f; + if(x->x_index > MAX_ARG) + { + x->x_index = MAX_ARG; + post("average: set number of items to %d", x->x_index); + } + x->x_inpointer = 0; + x->x_average = 0; + x->x_mode = 0; + return (void *)x; +} + +#ifndef MAXLIB +void average_setup(void) +{ + average_class = class_new(gensym("average"), (t_newmethod)average_new, + (t_method)average_free, sizeof(t_average), 0, A_DEFFLOAT, 0); +#else +void maxlib_average_setup(void) +{ + average_class = class_new(gensym("maxlib_average"), (t_newmethod)average_new, + (t_method)average_free, sizeof(t_average), 0, A_DEFFLOAT, 0); +#endif + class_addmethod(average_class, (t_method)average_reset, gensym("reset"), 0); + class_addmethod(average_class, (t_method)average_linear, gensym("linear"), 0); + class_addmethod(average_class, (t_method)average_geometric, gensym("geometric"), 0); + class_addmethod(average_class, (t_method)average_weight, gensym("weight"), 0); + class_addfloat(average_class, average_float); + class_addmethod(average_class, (t_method)average_index, gensym("index"), A_FLOAT, 0); +#ifndef MAXLIB + post(version); + +#else + class_addcreator((t_newmethod)average_new, gensym("average"), A_DEFFLOAT, 0); + class_sethelpsymbol(average_class, gensym("maxlib/average-help.pd")); +#endif +} + -- cgit v1.2.1