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/* For information on usage and redistribution, and for a DISCLAIMER OF ALL
* WARRANTIES, see the file, "LICENSE.txt," in this distribution.
iemlib1 written by Thomas Musil, Copyright (c) IEM KUG Graz Austria 2000 - 2005 */
#ifdef _MSC_VER
#pragma warning( disable : 4244 )
#pragma warning( disable : 4305 )
#endif
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
#include <stdio.h>
#include <string.h>
/* ---------------- peakenv~ - simple peak-envelope-converter. ----------------- */
typedef struct sigpeakenv
{
t_object x_obj;
float x_sr;
float x_old_peak;
float x_c1;
float x_releasetime;
float x_msi;
} t_sigpeakenv;
t_class *sigpeakenv_class;
static void sigpeakenv_reset(t_sigpeakenv *x)
{
x->x_old_peak = 0.0f;
}
static void sigpeakenv_ft1(t_sigpeakenv *x, t_floatarg f)/* release-time in ms */
{
if(f < 0.0f)
f = 0.0f;
x->x_releasetime = f;
x->x_c1 = exp(-1.0/(x->x_sr*0.001*x->x_releasetime));
}
static t_int *sigpeakenv_perform(t_int *w)
{
float *in = (float *)(w[1]);
float *out = (float *)(w[2]);
t_sigpeakenv *x = (t_sigpeakenv *)(w[3]);
int n = (int)(w[4]);
float peak = x->x_old_peak;
float c1 = x->x_c1;
float absolute;
int i;
for(i=0; i<n; i++)
{
absolute = fabs(*in++);
peak *= c1;
if(absolute > peak)
peak = absolute;
*out++ = peak;
}
/* NAN protect */
if(IEM_DENORMAL(peak))
peak = 0.0f;
x->x_old_peak = peak;
return(w+5);
}
static void sigpeakenv_dsp(t_sigpeakenv *x, t_signal **sp)
{
x->x_sr = (float)sp[0]->s_sr;
sigpeakenv_ft1(x, x->x_releasetime);
dsp_add(sigpeakenv_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
}
static void *sigpeakenv_new(t_floatarg f)
{
t_sigpeakenv *x = (t_sigpeakenv *)pd_new(sigpeakenv_class);
if(f <= 0.0f)
f = 0.0f;
x->x_sr = 44100.0f;
sigpeakenv_ft1(x, f);
x->x_old_peak = 0.0f;
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
outlet_new(&x->x_obj, &s_signal);
x->x_msi = 0;
return(x);
}
void sigpeakenv_setup(void)
{
sigpeakenv_class = class_new(gensym("peakenv~"), (t_newmethod)sigpeakenv_new,
0, sizeof(t_sigpeakenv), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(sigpeakenv_class, t_sigpeakenv, x_msi);
class_addmethod(sigpeakenv_class, (t_method)sigpeakenv_dsp, gensym("dsp"), 0);
class_addmethod(sigpeakenv_class, (t_method)sigpeakenv_ft1, gensym("ft1"), A_FLOAT, 0);
class_addmethod(sigpeakenv_class, (t_method)sigpeakenv_reset, gensym("reset"), 0);
class_sethelpsymbol(sigpeakenv_class, gensym("iemhelp/help-peakenv~"));
}
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