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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 */
#include "m_pd.h"
#include "iemlib.h"
#include <math.h>
/* ------------------------- f2note ---------------------- */
/* ------ frequency to note plus cents converter --------- */
typedef struct _f2note
{
t_object x_obj;
void *x_outlet_midi;
void *x_outlet_note;
void *x_outlet_cent;
int x_centomidi;
t_float x_refhz;
t_float x_refexp;
t_float x_reflog;
t_symbol *x_set;
} t_f2note;
static t_class *f2note_class;
t_float f2note_mtof(t_f2note *x, t_float midi)
{
return(x->x_refexp * exp(0.057762265047 * midi));
}
t_float f2note_ftom(t_f2note *x, t_float freq)
{
return (freq > 0 ? 17.31234049 * log(x->x_reflog * freq) : -1500);
}
void f2note_calc_ref(t_f2note *x)
{
t_float ln2=log(2.0);
x->x_refexp = x->x_refhz*exp(-5.75*ln2);
x->x_reflog = 1.0/x->x_refexp;
}
static void f2note_make_note(char *str, int midi)
{
int j,k,l=0;
j = midi / 12;
k = midi % 12;
if(k <= 5)
{
if(k <= 2)
{
if(k==0)
str[l]='c';
else if(k==1)
{
str[l++]='#';
str[l]='c';
}
else
str[l]='d';
}
else
{
if(k==3)
{
str[l++]='#';
str[l]='d';
}
else if(k==4)
str[l]='e';
else
str[l]='f';
}
}
else
{
if(k <= 8)
{
if(k==6)
{
str[l++]='#';
str[l]='f';
}
else if(k==7)
str[l]='g';
else
{
str[l++]='#';
str[l]='g';
}
}
else
{
if(k==9)
str[l]='a';
else if(k==10)
{
str[l++]='#';
str[l]='a';
}
else
str[l]='h';
}
}
if(j < 4)
{
str[l] -= 'a';
str[l] += 'A';
}
l++;
if(j < 3)
{
str[l++] = '0' + (char)(3 - j);
}
else if(j > 4)
{
str[l++] = '0' + (char)(j - 4);
}
str[l] = 0;
}
static void f2note_bang(t_f2note *x)
{
int i,j;
t_atom at;
char s[4];
i = (x->x_centomidi + 50)/100;
j = x->x_centomidi - 100*i;
outlet_float(x->x_outlet_cent, (t_float)j);
f2note_make_note(s, i);
SETSYMBOL(&at, gensym(s));
outlet_anything(x->x_outlet_note, x->x_set, 1, &at);
outlet_float(x->x_outlet_midi, 0.01f*(t_float)(x->x_centomidi));
}
static void f2note_float(t_f2note *x, t_floatarg freq)
{
x->x_centomidi = (int)(100.0f*f2note_ftom(x, freq) + 0.5f);
f2note_bang(x);
}
void f2note_ref(t_f2note *x, t_floatarg ref)
{
x->x_refhz = ref;
f2note_calc_ref(x);
}
static void *f2note_new(t_floatarg ref)
{
t_f2note *x = (t_f2note *)pd_new(f2note_class);
if(ref == 0.0f)
ref=440.0f;
x->x_refhz = ref;
x->x_centomidi = (int)(100.0f*ref + 0.499f);
f2note_calc_ref(x);
x->x_outlet_midi = outlet_new(&x->x_obj, &s_float);
x->x_outlet_note = outlet_new(&x->x_obj, &s_list);
x->x_outlet_cent = outlet_new(&x->x_obj, &s_float);
x->x_set = gensym("set");
return (x);
}
static void f2note_free(t_f2note *x)
{
}
void f2note_setup(void)
{
f2note_class = class_new(gensym("f2note"), (t_newmethod)f2note_new, (t_method)f2note_free,
sizeof(t_f2note), 0, A_DEFFLOAT, 0);
class_addbang(f2note_class,f2note_bang);
class_addfloat(f2note_class,f2note_float);
class_addmethod(f2note_class, (t_method)f2note_ref, gensym("ref"), A_FLOAT, 0);
class_sethelpsymbol(f2note_class, gensym("iemhelp/help-f2note"));
}
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