diff options
Diffstat (limited to 'pd/src/x_acoustics.c')
| -rw-r--r-- | pd/src/x_acoustics.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/pd/src/x_acoustics.c b/pd/src/x_acoustics.c new file mode 100644 index 00000000..ee7250df --- /dev/null +++ b/pd/src/x_acoustics.c @@ -0,0 +1,193 @@ +/* Copyright (c) 1997-1999 Miller Puckette. +* For information on usage and redistribution, and for a DISCLAIMER OF ALL +* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */ + +/* utility functions for signals +*/ + +#include "m_pd.h" +#include <math.h> +#define LOGTEN 2.302585092994 + +float mtof(float f) +{ + if (f <= -1500) return(0); + else if (f > 1499) return(mtof(1499)); + else return (8.17579891564 * exp(.0577622650 * f)); +} + +float ftom(float f) +{ + return (f > 0 ? 17.3123405046 * log(.12231220585 * f) : -1500); +} + +float powtodb(float f) +{ + if (f <= 0) return (0); + else + { + float val = 100 + 10./LOGTEN * log(f); + return (val < 0 ? 0 : val); + } +} + +float rmstodb(float f) +{ + if (f <= 0) return (0); + else + { + float val = 100 + 20./LOGTEN * log(f); + return (val < 0 ? 0 : val); + } +} + +float dbtopow(float f) +{ + if (f <= 0) + return(0); + else + { + if (f > 870) + f = 870; + return (exp((LOGTEN * 0.1) * (f-100.))); + } +} + +float dbtorms(float f) +{ + if (f <= 0) + return(0); + else + { + if (f > 485) + f = 485; + } + return (exp((LOGTEN * 0.05) * (f-100.))); +} + +/* ------------- corresponding objects ----------------------- */ + +static t_class *mtof_class; + +static void *mtof_new(void) +{ + t_object *x = (t_object *)pd_new(mtof_class); + outlet_new(x, &s_float); + return (x); +} + +static void mtof_float(t_object *x, t_float f) +{ + outlet_float(x->ob_outlet, mtof(f)); +} + + +static t_class *ftom_class; + +static void *ftom_new(void) +{ + t_object *x = (t_object *)pd_new(ftom_class); + outlet_new(x, &s_float); + return (x); +} + +static void ftom_float(t_object *x, t_float f) +{ + outlet_float(x->ob_outlet, ftom(f)); +} + + +static t_class *rmstodb_class; + +static void *rmstodb_new(void) +{ + t_object *x = (t_object *)pd_new(rmstodb_class); + outlet_new(x, &s_float); + return (x); +} + +static void rmstodb_float(t_object *x, t_float f) +{ + outlet_float(x->ob_outlet, rmstodb(f)); +} + + +static t_class *powtodb_class; + +static void *powtodb_new(void) +{ + t_object *x = (t_object *)pd_new(powtodb_class); + outlet_new(x, &s_float); + return (x); +} + +static void powtodb_float(t_object *x, t_float f) +{ + outlet_float(x->ob_outlet, powtodb(f)); +} + + +static t_class *dbtopow_class; + +static void *dbtopow_new(void) +{ + t_object *x = (t_object *)pd_new(dbtopow_class); + outlet_new(x, &s_float); + return (x); +} + +static void dbtopow_float(t_object *x, t_float f) +{ + outlet_float(x->ob_outlet, dbtopow(f)); +} + + +static t_class *dbtorms_class; + +static void *dbtorms_new(void) +{ + t_object *x = (t_object *)pd_new(dbtorms_class); + outlet_new(x, &s_float); + return (x); +} + +static void dbtorms_float(t_object *x, t_float f) +{ + outlet_float(x->ob_outlet, dbtorms(f)); +} + + +void x_acoustics_setup(void) +{ + t_symbol *s = gensym("acoustics.pd"); + mtof_class = class_new(gensym("mtof"), mtof_new, 0, + sizeof(t_object), 0, 0); + class_addfloat(mtof_class, (t_method)mtof_float); + class_sethelpsymbol(mtof_class, s); + + ftom_class = class_new(gensym("ftom"), ftom_new, 0, + sizeof(t_object), 0, 0); + class_addfloat(ftom_class, (t_method)ftom_float); + class_sethelpsymbol(ftom_class, s); + + powtodb_class = class_new(gensym("powtodb"), powtodb_new, 0, + sizeof(t_object), 0, 0); + class_addfloat(powtodb_class, (t_method)powtodb_float); + class_sethelpsymbol(powtodb_class, s); + + rmstodb_class = class_new(gensym("rmstodb"), rmstodb_new, 0, + sizeof(t_object), 0, 0); + class_addfloat(rmstodb_class, (t_method)rmstodb_float); + class_sethelpsymbol(rmstodb_class, s); + + dbtopow_class = class_new(gensym("dbtopow"), dbtopow_new, 0, + sizeof(t_object), 0, 0); + class_addfloat(dbtopow_class, (t_method)dbtopow_float); + class_sethelpsymbol(dbtopow_class, s); + + dbtorms_class = class_new(gensym("dbtorms"), dbtorms_new, 0, + sizeof(t_object), 0, 0); + class_addfloat(dbtorms_class, (t_method)dbtorms_float); + class_sethelpsymbol(dbtorms_class, s); +} + |