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#include "m_pd.h"
#include <math.h>
static t_class *zeroxpos_tilde_class;
typedef struct _zeroxpos_control
{
t_float *c_input;
t_int final_pol;
} t_zeroxpos_control;
typedef struct _zeroxpos_tilde
{
t_object x_obj;
t_zeroxpos_control x_ctl;
t_float f_num, f_dummy, f_dir;
t_int i_bang, i_pol, i_count, i_ndx, i_mode;
t_outlet *f_pos, *f_pol;
} t_zeroxpos_tilde;
t_int *zeroxpos_tilde_perform(t_int *w)
{
t_zeroxpos_tilde *x = (t_zeroxpos_tilde *)(w[1]);
t_zeroxpos_control *ctl = (t_zeroxpos_control *)(w[2]);
int n = (int)(w[3]);
t_float *in = ctl->c_input;
x->f_dir = x->f_num >= 0 ? 1 : -1;
int number = x->f_num >= 1 || x->f_num <= -1 ? (int)fabs(x->f_num) : 1;
int count = x->i_count;
int polarity = 1;
int i = 0;
x->i_pol = 0;
x->i_ndx = -1;
int prev = ctl->final_pol == 0 ? in[0] : ctl->final_pol;
if(x->i_mode == 0)
{
if(x->f_dir > 0)
{
for(i=0;i<n;i++)
{
polarity = in[i] >= 0 ? 1 : -1;
if((polarity < prev || polarity > prev) && count == number && x->i_bang == 1)
{
x->i_ndx = i;
x->i_pol = polarity;
count += 1e+06;
x->i_bang = 0;
outlet_float(x->f_pol, (float)x->i_pol);
outlet_float(x->f_pos, (float)x->i_ndx);
}
if((polarity < prev || polarity > prev) && count < number) count++;
if(i==n-1&&count<number)
{
ctl->final_pol = polarity;
x->i_count = count;
}
prev = polarity;
}
}
else if(x->f_dir < 0)
{
for(i=n-1;i>=0;i--)
{
polarity = in[i] >= 0 ? 1 : -1;
if((polarity < prev || polarity > prev) && count == number && x->i_bang == 1)
{
x->i_ndx = i;
x->i_pol = polarity;
count += 1e+06;
x->i_bang = 0;
outlet_float(x->f_pol, (float)(x->i_pol*-1));
outlet_float(x->f_pos, (float)x->i_ndx+1);
}
if((polarity < prev || polarity > prev) && count < number) count++;
if(i==0&&count<number)
{
ctl->final_pol = polarity;
x->i_count = count;
}
prev = polarity;
}
}
}
else if(x->i_mode != 0)
{
if(x->f_dir > 0)
{
for(i=0;i<n;i++)
{
polarity = in[i] >= 0 ? 1 : -1;
if((polarity < prev || polarity > prev) && count == number)
{
x->i_ndx = i;
x->i_pol = polarity;
count += 1e+06;
x->i_bang = 0;
}
if((polarity < prev || polarity > prev) && count < number) count++;
if(i==n-1&&count<number)
{
ctl->final_pol = polarity;
x->i_count = count;
}
prev = polarity;
}
}
else if(x->f_dir < 0)
{
for(i=n-1;i>=0;i--)
{
polarity = in[i] >= 0 ? 1 : -1;
if((polarity < prev || polarity > prev) && count == number)
{
x->i_ndx = i;
x->i_pol = polarity;
count += 1e+06;
x->i_bang = 0;
}
if((polarity < prev || polarity > prev) && count < number) count++;
if(i==0&&count<number)
{
ctl->final_pol = polarity;
x->i_count = count;
}
prev = polarity;
}
}
}
return(w+4);
}
void zeroxpos_tilde_bang(t_zeroxpos_tilde *x)
{
if(x->i_mode == 0)
{
x->i_bang = 1;
x->i_count = 0;
}
else if(x->i_mode != 0 && x->f_dir > 0)
{
outlet_float(x->f_pol, (float)x->i_pol);
outlet_float(x->f_pos, (float)x->i_ndx);
}
else if(x->i_mode != 0 && x->f_dir < 0)
{
outlet_float(x->f_pol, (float)(x->i_pol*-1));
outlet_float(x->f_pos, (float)x->i_ndx+1);
}
}
void zeroxpos_tilde_mode(t_zeroxpos_tilde *x, t_floatarg fmode)
{
x->i_mode = (int)fmode;
}
void *zeroxpos_tilde_dsp(t_zeroxpos_tilde *x, t_signal **sp)
{
x->x_ctl.c_input = sp[0]->s_vec;
dsp_add(zeroxpos_tilde_perform, 3, x, &x->x_ctl, sp[0]->s_n);
return (void *)x;
}
void *zeroxpos_tilde_new(t_floatarg f)
{
t_zeroxpos_tilde *x = (t_zeroxpos_tilde *)pd_new(zeroxpos_tilde_class);
x->f_dir = f >= 0 ? 1 : -1;
x->f_num = f >= 1 || f <= -1 ? (int)fabs(f) : 1;
x->x_ctl.final_pol = 0;
x->i_count = 0;
floatinlet_new (&x->x_obj, &x->f_num);
x->f_pos = outlet_new(&x->x_obj, gensym("float"));
x->f_pol = outlet_new(&x->x_obj, gensym("float"));
return (void *)x;
}
void zeroxpos_tilde_setup(void)
{
zeroxpos_tilde_class = class_new(gensym("zeroxpos~"),
(t_newmethod)zeroxpos_tilde_new,
0, sizeof(t_zeroxpos_tilde),
CLASS_DEFAULT, A_DEFFLOAT, 0);
post("|¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬¬zeroxpos~``````````````````````|");
post("|find 1st, 2nd or 3rd etc zero crossing point in frame|");
post("|````edward¬¬¬¬¬¬¬¬¬¬¬¬kelly``````````````````2005¬¬¬¬|");
class_addbang(zeroxpos_tilde_class, zeroxpos_tilde_bang);
class_addmethod(zeroxpos_tilde_class, (t_method)zeroxpos_tilde_dsp, gensym("dsp"), 0);
class_addmethod(zeroxpos_tilde_class, (t_method)zeroxpos_tilde_mode, gensym("mode"), A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(zeroxpos_tilde_class, t_zeroxpos_tilde, f_dummy);
}
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