2 Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org>
3 and Amaury Hazan <ahazan@iua.upf.edu>
5 This file is part of aubio.
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.
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.
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/>.
22 #include "aubio_priv.h"
27 #include "spectral/filterbank.h"
28 #include "mathutils.h"
30 /** \brief A structure to store a set of n_filters filters of lenghts win_s */
31 struct _aubio_filterbank_t
41 new_aubio_filterbank (uint_t n_filters, uint_t win_s)
43 /* allocate space for filterbank object */
44 aubio_filterbank_t *fb = AUBIO_NEW (aubio_filterbank_t);
46 if ((sint_t)n_filters <= 0) {
47 AUBIO_ERR("filterbank: n_filters should be > 0, got %d\n", n_filters);
50 if ((sint_t)win_s <= 0) {
51 AUBIO_ERR("filterbank: win_s should be > 0, got %d\n", win_s);
55 fb->n_filters = n_filters;
57 /* allocate filter tables, a matrix of length win_s and of height n_filters */
58 fb->filters = new_fmat (n_filters, win_s / 2 + 1);
71 del_aubio_filterbank (aubio_filterbank_t * fb)
73 del_fmat (fb->filters);
78 aubio_filterbank_do (aubio_filterbank_t * f, const cvec_t * in, fvec_t * out)
80 /* apply filter to all input channel, provided out has enough channels */
81 //uint_t max_filters = MIN (f->n_filters, out->length);
82 //uint_t max_length = MIN (in->length, f->filters->length);
84 // view cvec->norm as fvec->data
86 tmp.length = in->length;
89 if (f->power != 1.) fvec_pow(&tmp, f->power);
91 fmat_vecmul(f->filters, &tmp, out);
97 aubio_filterbank_get_coeffs (const aubio_filterbank_t * f)
103 aubio_filterbank_set_coeffs (aubio_filterbank_t * f, const fmat_t * filter_coeffs)
105 fmat_copy(filter_coeffs, f->filters);
110 aubio_filterbank_set_norm (aubio_filterbank_t *f, smpl_t norm)
112 if (norm != 0 && norm != 1) return AUBIO_FAIL;
118 aubio_filterbank_get_norm (aubio_filterbank_t *f)
124 aubio_filterbank_set_power (aubio_filterbank_t *f, smpl_t power)
131 aubio_filterbank_get_power (aubio_filterbank_t *f)