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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 - 2006 */
#include "m_pd.h"
#include "iemlib.h"
/* -- mov_avrg_kern~ - kernel for a moving-average-filter with IIR - */
typedef struct _mov_avrg_kern_tilde
{
t_object x_obj;
double x_wn1;
double x_a0;
double x_sr;
double x_mstime;
int x_nsamps;
int x_counter;
t_float x_msi;
} t_mov_avrg_kern_tilde;
static t_class *mov_avrg_kern_tilde_class;
static t_int *mov_avrg_kern_tilde_perform(t_int *w)
{
t_float *in_direct = (t_float *)(w[1]);
t_float *in_delayed = (t_float *)(w[2]);
t_float *out = (t_float *)(w[3]);
t_mov_avrg_kern_tilde *x = (t_mov_avrg_kern_tilde *)(w[4]);
int i, n = (int)(w[5]);
double wn0, wn1=x->x_wn1, a0=x->x_a0;
if(x->x_counter)
{
int counter = x->x_counter;
if(counter >= n)
{
x->x_counter = counter - n;
for(i=0; i<n; i++)
{
wn0 = wn1 + a0*(double)(*in_direct++);
*out++ = (t_float)wn0;
wn1 = wn0;
}
}
else
{
x->x_counter = 0;
for(i=0; i<counter; i++)
{
wn0 = wn1 + a0*(double)(*in_direct++);
*out++ = (t_float)wn0;
wn1 = wn0;
}
for(i=counter; i<n; i++)
{
wn0 = wn1 + a0*(double)(*in_direct++ - *in_delayed++);
*out++ = (t_float)wn0;
wn1 = wn0;
}
}
}
else
{
for(i=0; i<n; i++)
{
wn0 = wn1 + a0*(double)(*in_direct++ - *in_delayed++);
*out++ = (t_float)wn0;
wn1 = wn0;
}
}
x->x_wn1 = wn1;
return(w+6);
}
static void mov_avrg_kern_tilde_ft1(t_mov_avrg_kern_tilde *x, t_floatarg mstime)
{
if(mstime < 0.04)
mstime = 0.04;
x->x_mstime = (double)mstime;
x->x_nsamps = (int)(x->x_sr * x->x_mstime);
x->x_counter = x->x_nsamps;
x->x_wn1 = 0.0;
x->x_a0 = 1.0/(double)(x->x_nsamps);
}
static void mov_avrg_kern_tilde_reset(t_mov_avrg_kern_tilde *x)
{
x->x_counter = x->x_nsamps;
x->x_wn1 = 0.0;
}
static void mov_avrg_kern_tilde_dsp(t_mov_avrg_kern_tilde *x, t_signal **sp)
{
x->x_sr = 0.001*(double)(sp[0]->s_sr);
x->x_nsamps = (int)(x->x_sr * x->x_mstime);
x->x_counter = x->x_nsamps;
x->x_wn1 = 0.0;
x->x_a0 = 1.0/(double)(x->x_nsamps);
dsp_add(mov_avrg_kern_tilde_perform, 5, sp[0]->s_vec, sp[1]->s_vec, sp[2]->s_vec, x, sp[0]->s_n);
}
static void *mov_avrg_kern_tilde_new(t_floatarg mstime)
{
t_mov_avrg_kern_tilde *x = (t_mov_avrg_kern_tilde *)pd_new(mov_avrg_kern_tilde_class);
if(mstime < 0.04)
mstime = 0.04;
x->x_mstime = (double)mstime;
x->x_sr = 44.1;
x->x_nsamps = (int)(x->x_sr * x->x_mstime);
x->x_counter = x->x_nsamps;
x->x_wn1 = 0.0;
x->x_a0 = 1.0/(double)(x->x_nsamps);
inlet_new(&x->x_obj, &x->x_obj.ob_pd, &s_signal, &s_signal);
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 mov_avrg_kern_tilde_setup(void)
{
mov_avrg_kern_tilde_class = class_new(gensym("mov_avrg_kern~"), (t_newmethod)mov_avrg_kern_tilde_new,
0, sizeof(t_mov_avrg_kern_tilde), 0, A_FLOAT, 0);
CLASS_MAINSIGNALIN(mov_avrg_kern_tilde_class, t_mov_avrg_kern_tilde, x_msi);
class_addmethod(mov_avrg_kern_tilde_class, (t_method)mov_avrg_kern_tilde_dsp, gensym("dsp"), 0);
class_addmethod(mov_avrg_kern_tilde_class, (t_method)mov_avrg_kern_tilde_ft1, gensym("ft1"), A_FLOAT, 0);
class_addmethod(mov_avrg_kern_tilde_class, (t_method)mov_avrg_kern_tilde_reset, gensym("reset"), 0);
}
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