source: src/spectral/filterbank.c @ 0e30a12

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretch
Last change on this file since 0e30a12 was 0e30a12, checked in by Paul Brossier <piem@piem.org>, 14 months ago

[filterbank] add norm and power parameters

  • Property mode set to 100644
File size: 2.7 KB
Line 
1/*
2  Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org>
3                      and Amaury Hazan <ahazan@iua.upf.edu>
4
5  This file is part of aubio.
6
7  aubio is free software: you can redistribute it and/or modify
8  it under the terms of the GNU General Public License as published by
9  the Free Software Foundation, either version 3 of the License, or
10  (at your option) any later version.
11
12  aubio is distributed in the hope that it will be useful,
13  but WITHOUT ANY WARRANTY; without even the implied warranty of
14  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15  GNU General Public License for more details.
16
17  You should have received a copy of the GNU General Public License
18  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
19
20*/
21
22#include "aubio_priv.h"
23#include "fvec.h"
24#include "fmat.h"
25#include "cvec.h"
26#include "vecutils.h"
27#include "spectral/filterbank.h"
28#include "mathutils.h"
29
30/** \brief A structure to store a set of n_filters filters of lenghts win_s */
31struct _aubio_filterbank_t
32{
33  uint_t win_s;
34  uint_t n_filters;
35  fmat_t *filters;
36  smpl_t norm;
37  smpl_t power;
38};
39
40aubio_filterbank_t *
41new_aubio_filterbank (uint_t n_filters, uint_t win_s)
42{
43  /* allocate space for filterbank object */
44  aubio_filterbank_t *fb = AUBIO_NEW (aubio_filterbank_t);
45  fb->win_s = win_s;
46  fb->n_filters = n_filters;
47
48  /* allocate filter tables, a matrix of length win_s and of height n_filters */
49  fb->filters = new_fmat (n_filters, win_s / 2 + 1);
50
51  fb->norm = 1;
52
53  fb->power = 1;
54
55  return fb;
56}
57
58void
59del_aubio_filterbank (aubio_filterbank_t * fb)
60{
61  del_fmat (fb->filters);
62  AUBIO_FREE (fb);
63}
64
65void
66aubio_filterbank_do (aubio_filterbank_t * f, const cvec_t * in, fvec_t * out)
67{
68  /* apply filter to all input channel, provided out has enough channels */
69  //uint_t max_filters = MIN (f->n_filters, out->length);
70  //uint_t max_length = MIN (in->length, f->filters->length);
71
72  // view cvec->norm as fvec->data
73  fvec_t tmp;
74  tmp.length = in->length;
75  tmp.data = in->norm;
76
77  if (f->power != 1.) fvec_pow(&tmp, f->power);
78
79  fmat_vecmul(f->filters, &tmp, out);
80
81  return;
82}
83
84fmat_t *
85aubio_filterbank_get_coeffs (const aubio_filterbank_t * f)
86{
87  return f->filters;
88}
89
90uint_t
91aubio_filterbank_set_coeffs (aubio_filterbank_t * f, const fmat_t * filter_coeffs)
92{
93  fmat_copy(filter_coeffs, f->filters);
94  return 0;
95}
96
97uint_t
98aubio_filterbank_set_norm (aubio_filterbank_t *f, smpl_t norm)
99{
100  if (norm != 0 && norm != 1) return AUBIO_FAIL;
101  f->norm = norm;
102  return AUBIO_OK;
103}
104
105smpl_t
106aubio_filterbank_get_norm (aubio_filterbank_t *f)
107{
108  return f->norm;
109}
110
111uint_t
112aubio_filterbank_set_power (aubio_filterbank_t *f, smpl_t power)
113{
114  f->power = power;
115  return AUBIO_OK;
116}
117
118smpl_t
119aubio_filterbank_get_power (aubio_filterbank_t *f)
120{
121  return f->norm;
122}
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