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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"
/* ---------- FIR~ - FIR-filter with table-coef ----------- */
typedef struct _FIR_tilde
{
t_object x_obj;
t_float *x_coef_beg;
t_float *x_history_beg;
int x_rw_index;
int x_fir_order;
t_symbol *x_table_name;
t_float x_msi;
} t_FIR_tilde;
t_class *FIR_tilde_class;
static t_int *FIR_tilde_perform(t_int *w)
{
t_float *in = (t_float *)(w[1]);
t_float *out = (t_float *)(w[2]);
t_FIR_tilde *x = (t_FIR_tilde *)(w[3]);
int n = (t_int)(w[4]);
int rw_index = x->x_rw_index;
int i, j;
int order = x->x_fir_order;
int ord16 = order / 16;
t_float sum=0.0f;
t_float *coef = x->x_coef_beg;
t_float *write_hist1=x->x_history_beg;
t_float *write_hist2;
t_float *read_hist;
t_float *coef_vec;
t_float *hist_vec;
if(!coef)
goto FIR_tildeperfzero;
write_hist1 = x->x_history_beg;
write_hist2 = write_hist1 + order;
read_hist = write_hist2;
for(i=0; i<n; i++)
{
write_hist1[rw_index] = in[i];
write_hist2[rw_index] = in[i];
sum = 0.0f;
coef_vec = coef;
hist_vec = &read_hist[rw_index];
for(j=0; j<ord16; j++)
{
sum += coef_vec[0] * hist_vec[0];
sum += coef_vec[1] * hist_vec[-1];
sum += coef_vec[2] * hist_vec[-2];
sum += coef_vec[3] * hist_vec[-3];
sum += coef_vec[4] * hist_vec[-4];
sum += coef_vec[5] * hist_vec[-5];
sum += coef_vec[6] * hist_vec[-6];
sum += coef_vec[7] * hist_vec[-7];
sum += coef_vec[8] * hist_vec[-8];
sum += coef_vec[9] * hist_vec[-9];
sum += coef_vec[10] * hist_vec[-10];
sum += coef_vec[11] * hist_vec[-11];
sum += coef_vec[12] * hist_vec[-12];
sum += coef_vec[13] * hist_vec[-13];
sum += coef_vec[14] * hist_vec[-14];
sum += coef_vec[15] * hist_vec[-15];
coef_vec += 16;
hist_vec -= 16;
}
for(j=ord16*16; j<order; j++)
{
sum += coef[j] * read_hist[rw_index-j];
}
out[i] = sum;
rw_index++;
if(rw_index >= order)
rw_index -= order;
}
x->x_rw_index = rw_index;
return(w+5);
FIR_tildeperfzero:
while(n--)
*out++ = 0.0f;
return(w+5);
}
void FIR_tilde_set(t_FIR_tilde *x, t_symbol *table_name, t_floatarg forder)
{
t_garray *ga;
int table_size;
int order = (int)forder;
x->x_table_name = table_name;
if(!(ga = (t_garray *)pd_findbyclass(x->x_table_name, garray_class)))
{
if(*table_name->s_name)
error("FIR~: %s: no such table~", x->x_table_name->s_name);
x->x_coef_beg = 0;
}
else if(!garray_getfloatarray(ga, &table_size, &x->x_coef_beg))
{
error("%s: bad template for FIR~", x->x_table_name->s_name);
x->x_coef_beg = 0;
}
else if(table_size < order)
{
error("FIR~: tablesize %d < order %d !!!!", table_size, order);
x->x_coef_beg = 0;
}
else
garray_usedindsp(ga);
x->x_rw_index = 0;
if(order > x->x_fir_order)/* resize */
x->x_history_beg = (t_float *)resizebytes(x->x_history_beg, 2*x->x_fir_order*sizeof(t_float), 2*order*sizeof(float));
x->x_fir_order = order;
}
static void FIR_tilde_dsp(t_FIR_tilde *x, t_signal **sp)
{
FIR_tilde_set(x, x->x_table_name, x->x_fir_order);
dsp_add(FIR_tilde_perform, 4, sp[0]->s_vec, sp[1]->s_vec, x, sp[0]->s_n);
}
static void *FIR_tilde_new(t_symbol *ref, t_floatarg np)
{
t_FIR_tilde *x = (t_FIR_tilde *)pd_new(FIR_tilde_class);
outlet_new(&x->x_obj, &s_signal);
x->x_msi = 0;
x->x_table_name = ref;
x->x_coef_beg = 0;
if((int)np < 1)
np = 1.0;
x->x_fir_order = (int)np;
x->x_history_beg = (t_float *)getbytes((2*x->x_fir_order)*sizeof(t_float));
x->x_rw_index = 0;
return(x);
}
static void FIR_tilde_free(t_FIR_tilde *x)
{
if(x->x_history_beg)
freebytes(x->x_history_beg, (2*x->x_fir_order)*sizeof(t_float));
}
void FIR_tilde_setup(void)
{
FIR_tilde_class = class_new(gensym("FIR~"), (t_newmethod)FIR_tilde_new,
(t_method)FIR_tilde_free, sizeof(t_FIR_tilde), 0, A_DEFSYM, A_DEFFLOAT, 0);
CLASS_MAINSIGNALIN(FIR_tilde_class, t_FIR_tilde, x_msi);
class_addmethod(FIR_tilde_class, (t_method)FIR_tilde_dsp, gensym("dsp"), 0);
class_addmethod(FIR_tilde_class, (t_method)FIR_tilde_set,
gensym("set"), A_SYMBOL, A_FLOAT, 0);
class_sethelpsymbol(FIR_tilde_class, gensym("iemhelp/help-FIR~"));
}
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