File: lpreson~.c

package info (click to toggle)
pd-ekext 0.1.1-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster
  • size: 1,408 kB
  • sloc: ansic: 2,700; makefile: 280
file content (131 lines) | stat: -rw-r--r-- 4,080 bytes parent folder | download | duplicates (3)
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
/*  Lattice IIR filter from PARCOR coefficients
 *  Copyright (C) 2005 Nicolas Chetry <okin@altern.org>
 *  and Edward Kelly <morph_2016@yahoo.co.uk>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "m_pd.h"

static t_class *lpreson_tilde_class;

typedef struct _lpreson_control
{
  t_float *c_residual, *c_output;
  t_atom *x_parcors;
  /*  t_atom x_parc_interp_one[MAXPOLES];
  t_int x_parc_ord_one;
  t_atom x_parc_interp_two[MAXPOLES];
  t_int x_parc_ord_two; */
} t_lpreson_control;

typedef struct _lpreson_tilde
{
  t_object x_obj;
  t_float f_dummy;
  t_int x_order;
  t_lpreson_control x_ctl;
} t_lpreson_tilde;

t_int *lpreson_tilde_perform(t_int *w)
{
  t_object x_obj;
  t_lpreson_tilde     *x =     (t_lpreson_tilde *)(w[1]);
  t_lpreson_control *ctl =   (t_lpreson_control *)(w[2]);
  int                  n =                   (int)(w[3]);
  t_float            *in = ctl->c_residual;
  t_float           *out = ctl->c_output;
  t_int              ord = x->x_order;
  float mem[ord+1];
/* 
 *  Do the inverse filtering 
 *  
 *  'data_in'     : residual signal (length 'len')
 *  'data_out'    : output frame (length 'len')
 *  'coeff'       : the parcor coefficients (length 'tap')
 *  'lattice_iir' : filter memory - Previously initialised using init_lattice_iir_filter()
 *
 */  
  int k, i;
  float sri;

  for (i=0;i<=ord;i++)
  {
    //    SETFLOAT (&schur->x_parcors[i],0);
    mem[i] = 0.0;
  }
  
  for (k = 0; k < n; k++ ) 
  {
    /* Synthesis filter - Lattice structure */
    sri  = in[k];
    for (i=0; i<ord; i++)
    {
      t_float parcor = atom_getfloatarg ((ord-1-i),ord,ctl->x_parcors);          
      sri =  sri -  parcor * mem[ord-1-i];
      mem[ord-i] = mem[ord-1-i] + parcor*sri;
    }
    out[k] = sri;
    mem[0] = sri;
            
  } /* next k */
  return(w+4);          
}

static void lpreson_tilde_list(t_lpreson_tilde *x, t_symbol *s, int argc, t_atom *argv)
{
  if (argc) 
  {
    //    x->x_ctl.parc_interp_two = copybytes(x->x_ctl.parc_interp_one, x->x_ctl.parc_ord_one * sizeof(t_atom));
    //    x->x_ctl.parc_ord_two = x->x_ctl.parc_ord_one;
    //    x->x_ctl.parc_interp_one = copybytes(x->x_ctl.parcors, x->x_order * sizeof(t_atom));
    //    x->x_ctl.parc_ord_one = x->x_order;
    freebytes(x->x_ctl.x_parcors, x->x_order * sizeof(t_atom));
  }

  x->x_ctl.x_parcors = copybytes(argv, argc * sizeof(t_atom));
  x->x_order = argc;
}

void *lpreson_tilde_dsp(t_lpreson_tilde *x, t_signal **sp)
{
  x->x_ctl.c_residual = sp[0]->s_vec;
  x->x_ctl.c_output = sp[1]->s_vec;
  dsp_add(lpreson_tilde_perform, 3, x, &x->x_ctl, sp[0]->s_n);
  return (void *)x;
}

void *lpreson_tilde_new(t_floatarg f)
{
  t_lpreson_tilde *x = (t_lpreson_tilde *)pd_new(lpreson_tilde_class);
  x->x_order = f >= 1 ? (int)f : 5;
  
  outlet_new(&x->x_obj, &s_signal);
  return (void *)x;
}

void lpreson_tilde_setup(void)
{
  lpreson_tilde_class = class_new(gensym("lpreson~"), (t_newmethod)lpreson_tilde_new, 0, sizeof(t_lpreson_tilde), CLASS_DEFAULT, A_DEFFLOAT, 0);

  post(". . Lattice IIR filter for lpc. . . . . . .");
  post(". . by Nicolas Chetry <okin@altern.org> . .");
  post(". & Edward Kelly <morph_2016@yahoo.co.uk> .");
  
  class_addmethod(lpreson_tilde_class, (t_method)lpreson_tilde_dsp, gensym("dsp"), 0);

  class_addlist(lpreson_tilde_class, lpreson_tilde_list);

  CLASS_MAINSIGNALIN(lpreson_tilde_class, t_lpreson_tilde, f_dummy);
}