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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 - 2008 */
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
/* ---------------- peakenv_hold~ - simple peak-envelope-converter with peak hold time and release time. ----------------- */
typedef struct _peakenv_hold_tilde
{
t_object x_obj;
t_float x_sr;
t_float x_old_peak;
t_float x_c1;
t_float x_releasetime;
t_float x_holdtime;
t_int x_n_hold;
t_int x_counter;
t_float x_msi;
} t_peakenv_hold_tilde;
static t_class *peakenv_hold_tilde_class;
static void peakenv_hold_tilde_reset(t_peakenv_hold_tilde *x)
{
x->x_old_peak = 0.0f;
}
static void peakenv_hold_tilde_ft1(t_peakenv_hold_tilde *x, t_float t_hold)/* hold-time in ms */
{
double dhold;
if(t_hold < 0.0f)
t_hold = 0.0f;
x->x_holdtime = t_hold;
dhold = (double)x->x_sr*(double)0.001*(double)x->x_holdtime;
if(dhold > 2147483647.0)
dhold = 2147483647.0;
x->x_n_hold = (t_int)(dhold + (double)0.5);
}
static void peakenv_hold_tilde_ft2(t_peakenv_hold_tilde *x, t_float t_rel)/* release-time in ms */
{
if(t_rel < 0.0f)
t_rel = 0.0f;
x->x_releasetime = t_rel;
x->x_c1 = exp(-1.0/(x->x_sr*0.001*x->x_releasetime));
}
static t_int *peakenv_hold_tilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_peakenv_hold_tilde *x = (t_peakenv_hold_tilde *)(w[3]);
int n = (int)(w[4]);
t_float peak = x->x_old_peak;
t_float c1 = x->x_c1;
t_float absolute;
t_int i, counter;
counter = x->x_counter;
for(i=0; i<n; i++)
{
absolute = fabs(*in++);
if(counter > 0)
counter--;// hold peride
else
peak *= c1;// release periode
if(absolute > peak)
{
peak = absolute;
counter = x->x_n_hold;// new hold initialisation
}
*out++ = peak;
}
/* NAN protect */
if(IEM_DENORMAL(peak))
peak = 0.0f;
x->x_old_peak = peak;
x->x_counter = counter;
return(w+5);
}
static void peakenv_hold_tilde_dsp(t_peakenv_hold_tilde *x, t_signal **sp)
{
x->x_sr = (t_float)sp[0]->s_sr;
peakenv_hold_tilde_ft1(x, x->x_holdtime);
peakenv_hold_tilde_ft2(x, x->x_releasetime);
dsp_add(peakenv_hold_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
}
static void *peakenv_hold_tilde_new(t_float t_hold, t_float t_rel)
{
t_peakenv_hold_tilde *x = (t_peakenv_hold_tilde *)pd_new(peakenv_hold_tilde_class);
x->x_sr = 44100.0f;
peakenv_hold_tilde_ft1(x, t_hold);
peakenv_hold_tilde_ft2(x, t_rel);
x->x_old_peak = 0.0f;
x->x_counter = 0;
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft1"));
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_float, gensym("ft2"));
outlet_new(&x->x_obj, &s_signal);
x->x_msi = 0;
return(x);
}
void peakenv_hold_tilde_setup(void)
{
peakenv_hold_tilde_class = class_new(gensym("peakenv_hold~"), (t_newmethod)peakenv_hold_tilde_new,
0, sizeof(t_peakenv_hold_tilde), 0, A_DEFFLOAT, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(peakenv_hold_tilde_class, t_peakenv_hold_tilde, x_msi);
class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_dsp, gensym("dsp"), 0);
class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_ft2, gensym("ft2"), A_FLOAT, 0);
class_addmethod(peakenv_hold_tilde_class, (t_method)peakenv_hold_tilde_reset, gensym("reset"), 0);
}
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