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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.
iem_spec2 written by Thomas Musil (c) IEM KUG Graz Austria 2002 - 2006 */
#include "m_pd.h"
#include "iemlib.h"
/* -- spec2_tab_conv~ - convolute a spectrum with a table --- */
typedef struct spec2_tab_conv_tilde
{
t_object x_obj;
t_float *x_spec;
t_float *x_beg_array;
int x_blocksize;
int x_winsize;
int x_has_changed;
t_symbol *x_sym_array;
t_float x_msi;
} t_spec2_tab_conv_tilde;
t_class *spec2_tab_conv_tilde_class;
static void spec2_tab_conv_tilde_set(t_spec2_tab_conv_tilde *x, t_symbol *s, int argc, t_atom *argv)
{
if(argc >= 2)
{
x->x_sym_array = (t_symbol *)(atom_getsymbol(argv));
argv++;
x->x_winsize = (int)(atom_getint(argv));
x->x_has_changed = 1;
}
}
static t_int *spec2_tab_conv_tilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_spec2_tab_conv_tilde *x = (t_spec2_tab_conv_tilde *)(w[3]);
t_float sum=0.0f;
t_float *vec1, *vec2, *vec3, *win;
int i, m, n = (int)(w[4])+1;
int j, ws=x->x_winsize;
vec2 = x->x_spec + n;
vec1 = vec2;
vec3 = vec2 + 2*n - 2;
for(i=0; i<n; i++)
{
sum = in[i];
*vec2++ = sum;
*vec1-- = sum;
*vec3-- = sum;
}
vec2 = x->x_spec + n - ws/2;
win = x->x_beg_array;
for(i=0; i<n; i++)
{
sum = 0.0f;
for(j=0; j<ws; j++)
sum += win[j] * vec2[j];
out[i] = sum;
vec2++;
}
return(w+5);
}
static void spec2_tab_conv_tilde_dsp(t_spec2_tab_conv_tilde *x, t_signal **sp)
{
int n = (sp[0]->s_n)/2;
t_garray *a;
int n_points;
if(x->x_has_changed)
{
x->x_has_changed = 0;
if(!(a = (t_garray *)pd_findbyclass(x->x_sym_array, garray_class)))
{
if(*x->x_sym_array->s_name)
error("spec2_tab_conv~: %s: no such array", x->x_sym_array->s_name);
}
else if(!garray_getfloatarray(a, &n_points, &x->x_beg_array))
error("%s: bad template for spec2_tab_conv~", x->x_sym_array->s_name);
else
{
if(n_points > (n+1))
n_points = n+1;
if(x->x_winsize < 0)
x->x_winsize = 0;
if(x->x_winsize > n_points)
x->x_winsize = n_points;
}
}
if(!x->x_blocksize)
{
x->x_spec = (t_float *)getbytes(3*(n+1)*sizeof(t_float));
x->x_blocksize = n;
}
else if(x->x_blocksize != n)
{
x->x_spec = (t_float *)resizebytes(x->x_spec, 3*(x->x_blocksize+1)*sizeof(t_float), 3*(n+1)*sizeof(t_float));
x->x_blocksize = n;
}
dsp_add(spec2_tab_conv_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, n);
}
static void spec2_tab_conv_tilde_free(t_spec2_tab_conv_tilde *x)
{
if(x->x_spec)
freebytes(x->x_spec, 3*(x->x_blocksize+1)*sizeof(t_float));
}
static void *spec2_tab_conv_tilde_new(t_symbol *s, int argc, t_atom *argv)
{
t_spec2_tab_conv_tilde *x = (t_spec2_tab_conv_tilde *)pd_new(spec2_tab_conv_tilde_class);
if(argc >= 2)
{
x->x_sym_array = (t_symbol *)(atom_getsymbol(argv));
argv++;
x->x_winsize = (int)(atom_getint(argv));
x->x_spec = (t_float *)0;
x->x_beg_array = (t_float *)0;
x->x_blocksize = 0;
x->x_has_changed = 1;
outlet_new(&x->x_obj, &s_signal);
x->x_msi = 0.0f;
return(x);
}
else
{
post("spec2_tab_conv~-ERROR: needs 2 args: <sym> convolution-array-name + <float> convolution-array-size !!!");
return(0);
}
}
void spec2_tab_conv_tilde_setup(void)
{
spec2_tab_conv_tilde_class = class_new(gensym("spec2_tab_conv~"), (t_newmethod)spec2_tab_conv_tilde_new,
(t_method)spec2_tab_conv_tilde_free, sizeof(t_spec2_tab_conv_tilde), 0, A_GIMME, 0);
CLASS_MAINSIGNALIN(spec2_tab_conv_tilde_class, t_spec2_tab_conv_tilde, x_msi);
class_addmethod(spec2_tab_conv_tilde_class, (t_method)spec2_tab_conv_tilde_dsp, gensym("dsp"), 0);
class_addmethod(spec2_tab_conv_tilde_class, (t_method)spec2_tab_conv_tilde_set, gensym("set"), A_GIMME, 0);
class_sethelpsymbol(spec2_tab_conv_tilde_class, gensym("iemhelp/spec2_tab_conv~-help"));
}
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