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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 - 2010 */
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
/* ---------------- peakenv~ - simple peak-envelope-converter. ----------------- */
/* -- now with double precision; for low-frequency filters it is important to calculate the filter in double precision -- */
typedef struct _peakenv_tilde
{
t_object x_obj;
double x_sr;
double x_old_peak;
double x_c1;
double x_releasetime;
t_float x_float_sig_in;
} t_peakenv_tilde;
static t_class *peakenv_tilde_class;
static void peakenv_tilde_reset(t_peakenv_tilde *x)
{
x->x_old_peak = 0.0;
}
static void peakenv_tilde_ft1(t_peakenv_tilde *x, t_floatarg f)/* release-time in ms */
{
if(f < 0.0)
f = 0.0;
x->x_releasetime = (double)f;
x->x_c1 = exp(-1.0/(x->x_sr*0.001*x->x_releasetime));
}
static t_int *peakenv_tilde_perform(t_int *w)
{
t_sample *in = (t_sample *)(w[1]);
t_sample *out = (t_sample *)(w[2]);
t_peakenv_tilde *x = (t_peakenv_tilde *)(w[3]);
int n = (int)(w[4]);
double peak = x->x_old_peak;
double c1 = x->x_c1;
double absolute;
int i;
for(i=0; i<n; i++)
{
absolute = (double)abs((double)(*in++));
peak *= c1;
if(absolute > peak)
peak = absolute;
*out++ = (t_sample)peak;
}
/* NAN protect */
//if(IEM_DENORMAL(peak))
// peak = 0.0f;
x->x_old_peak = peak;
return(w+5);
}
static void peakenv_tilde_dsp(t_peakenv_tilde *x, t_signal **sp)
{
x->x_sr = (double)sp[0]->s_sr;
peakenv_tilde_ft1(x, x->x_releasetime);
dsp_add(peakenv_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
}
static void *peakenv_tilde_new(t_floatarg f)
{
t_peakenv_tilde *x = (t_peakenv_tilde *)pd_new(peakenv_tilde_class);
if(f <= 0.0)
f = 0.0;
x->x_sr = 44100.0;
peakenv_tilde_ft1(x, f);
x->x_old_peak = 0.0;
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
outlet_new(&x->x_obj, &s_signal);
x->x_float_sig_in = 0.0;
return(x);
}
void peakenv_tilde_setup(void)
{
peakenv_tilde_class = class_new(gensym("peakenv~"), (t_newmethod)peakenv_tilde_new,
0, sizeof(t_peakenv_tilde), 0, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(peakenv_tilde_class, t_peakenv_tilde, x_float_sig_in);
class_addmethod(peakenv_tilde_class, (t_method)peakenv_tilde_dsp, gensym("dsp"), 0);
class_addmethod(peakenv_tilde_class, (t_method)peakenv_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
class_addmethod(peakenv_tilde_class, (t_method)peakenv_tilde_reset, gensym("reset"), 0);
}
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