198 lines
4 KiB
C
198 lines
4 KiB
C
/* Copyright (c) 1997-1999 Miller Puckette.
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* For information on usage and redistribution, and for a DISCLAIMER OF ALL
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* WARRANTIES, see the file, "LICENSE.txt," in this distribution. */
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/* utility functions for signals
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*/
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#ifdef ROCKBOX
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#include "plugin.h"
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#include "../../pdbox.h"
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#endif
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#include "m_pd.h"
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#include "../../math.h"
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#define LOGTEN 2.302585092994
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float mtof(float f)
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{
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if (f <= -1500) return(0);
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else if (f > 1499) return(mtof(1499));
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else return (8.17579891564 * exp(.0577622650 * f));
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}
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float ftom(float f)
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{
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return (f > 0 ? 17.3123405046 * log(.12231220585 * f) : -1500);
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}
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float powtodb(float f)
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{
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if (f <= 0) return (0);
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else
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{
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float val = 100 + 10./LOGTEN * log(f);
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return (val < 0 ? 0 : val);
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}
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}
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float rmstodb(float f)
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{
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if (f <= 0) return (0);
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else
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{
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float val = 100 + 20./LOGTEN * log(f);
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return (val < 0 ? 0 : val);
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}
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}
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float dbtopow(float f)
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{
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if (f <= 0)
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return(0);
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else
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{
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if (f > 870)
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f = 870;
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return (exp((LOGTEN * 0.1) * (f-100.)));
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}
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}
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float dbtorms(float f)
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{
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if (f <= 0)
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return(0);
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else
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{
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if (f > 485)
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f = 485;
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}
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return (exp((LOGTEN * 0.05) * (f-100.)));
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}
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/* ------------- corresponding objects ----------------------- */
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static t_class *mtof_class;
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static void *mtof_new(void)
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{
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t_object *x = (t_object *)pd_new(mtof_class);
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outlet_new(x, &s_float);
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return (x);
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}
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static void mtof_float(t_object *x, t_float f)
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{
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outlet_float(x->ob_outlet, mtof(f));
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}
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static t_class *ftom_class;
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static void *ftom_new(void)
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{
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t_object *x = (t_object *)pd_new(ftom_class);
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outlet_new(x, &s_float);
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return (x);
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}
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static void ftom_float(t_object *x, t_float f)
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{
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outlet_float(x->ob_outlet, ftom(f));
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}
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static t_class *rmstodb_class;
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static void *rmstodb_new(void)
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{
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t_object *x = (t_object *)pd_new(rmstodb_class);
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outlet_new(x, &s_float);
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return (x);
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}
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static void rmstodb_float(t_object *x, t_float f)
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{
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outlet_float(x->ob_outlet, rmstodb(f));
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}
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static t_class *powtodb_class;
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static void *powtodb_new(void)
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{
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t_object *x = (t_object *)pd_new(powtodb_class);
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outlet_new(x, &s_float);
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return (x);
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}
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static void powtodb_float(t_object *x, t_float f)
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{
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outlet_float(x->ob_outlet, powtodb(f));
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}
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static t_class *dbtopow_class;
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static void *dbtopow_new(void)
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{
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t_object *x = (t_object *)pd_new(dbtopow_class);
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outlet_new(x, &s_float);
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return (x);
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}
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static void dbtopow_float(t_object *x, t_float f)
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{
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outlet_float(x->ob_outlet, dbtopow(f));
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}
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static t_class *dbtorms_class;
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static void *dbtorms_new(void)
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{
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t_object *x = (t_object *)pd_new(dbtorms_class);
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outlet_new(x, &s_float);
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return (x);
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}
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static void dbtorms_float(t_object *x, t_float f)
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{
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outlet_float(x->ob_outlet, dbtorms(f));
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}
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void x_acoustics_setup(void)
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{
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t_symbol *s = gensym("acoustics.pd");
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mtof_class = class_new(gensym("mtof"), mtof_new, 0,
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sizeof(t_object), 0, 0);
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class_addfloat(mtof_class, (t_method)mtof_float);
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class_sethelpsymbol(mtof_class, s);
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ftom_class = class_new(gensym("ftom"), ftom_new, 0,
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sizeof(t_object), 0, 0);
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class_addfloat(ftom_class, (t_method)ftom_float);
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class_sethelpsymbol(ftom_class, s);
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powtodb_class = class_new(gensym("powtodb"), powtodb_new, 0,
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sizeof(t_object), 0, 0);
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class_addfloat(powtodb_class, (t_method)powtodb_float);
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class_sethelpsymbol(powtodb_class, s);
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rmstodb_class = class_new(gensym("rmstodb"), rmstodb_new, 0,
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sizeof(t_object), 0, 0);
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class_addfloat(rmstodb_class, (t_method)rmstodb_float);
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class_sethelpsymbol(rmstodb_class, s);
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dbtopow_class = class_new(gensym("dbtopow"), dbtopow_new, 0,
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sizeof(t_object), 0, 0);
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class_addfloat(dbtopow_class, (t_method)dbtopow_float);
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class_sethelpsymbol(dbtopow_class, s);
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dbtorms_class = class_new(gensym("dbtorms"), dbtorms_new, 0,
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sizeof(t_object), 0, 0);
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class_addfloat(dbtorms_class, (t_method)dbtorms_float);
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class_sethelpsymbol(dbtorms_class, s);
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}
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