aboutsummaryrefslogtreecommitdiff
path: root/src/iemlib1/FIR~.c
blob: 087190b3852992199a02ef2257f0a88e3efcf07d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
/* 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~"));
}