source: src/spectral/filterbank.c @ 218f670

sampler
Last change on this file since 218f670 was feb694b, checked in by Paul Brossier <piem@piem.org>, 9 years ago

src/spectral/: add const qualifiers

  • Property mode set to 100644
File size: 2.2 KB
RevLine 
[88199ce]1/*
[06cae6c]2  Copyright (C) 2007-2009 Paul Brossier <piem@aubio.org>
3                      and Amaury Hazan <ahazan@iua.upf.edu>
[88199ce]4
[1c2e186]5  This file is part of aubio.
[88199ce]6
[1c2e186]7  aubio is free software: you can redistribute it and/or modify
[06cae6c]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.
[88199ce]11
[1c2e186]12  aubio is distributed in the hope that it will be useful,
[06cae6c]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.
[88199ce]16
[06cae6c]17  You should have received a copy of the GNU General Public License
[1c2e186]18  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
[88199ce]19
[06cae6c]20*/
[f918cb9]21
[7c6c806d]22#include "aubio_priv.h"
[6c7d49b]23#include "fvec.h"
[d95ff38]24#include "fmat.h"
[6c7d49b]25#include "cvec.h"
[32d6958]26#include "spectral/filterbank.h"
[17961b0]27#include "mathutils.h"
[88199ce]28
[8708556]29/** \brief A structure to store a set of n_filters filters of lenghts win_s */
[e6c11e3]30struct _aubio_filterbank_t
[3b3b03e]31{
32  uint_t win_s;
33  uint_t n_filters;
[d95ff38]34  fmat_t *filters;
[7c6c806d]35};
36
[3b3b03e]37aubio_filterbank_t *
38new_aubio_filterbank (uint_t n_filters, uint_t win_s)
39{
[06cae6c]40  /* allocate space for filterbank object */
[3b3b03e]41  aubio_filterbank_t *fb = AUBIO_NEW (aubio_filterbank_t);
42  fb->win_s = win_s;
43  fb->n_filters = n_filters;
[88199ce]44
[d95ff38]45  /* allocate filter tables, a matrix of length win_s and of height n_filters */
[4ed0ed1]46  fb->filters = new_fmat (n_filters, win_s / 2 + 1);
[88199ce]47
[b276dee]48  return fb;
49}
50
[3b3b03e]51void
52del_aubio_filterbank (aubio_filterbank_t * fb)
53{
[d95ff38]54  del_fmat (fb->filters);
[3b3b03e]55  AUBIO_FREE (fb);
[06cae6c]56}
[95a64c7]57
[3b3b03e]58void
[feb694b]59aubio_filterbank_do (aubio_filterbank_t * f, const cvec_t * in, fvec_t * out)
[3b3b03e]60{
[06cae6c]61  /* apply filter to all input channel, provided out has enough channels */
[fc2d7fb]62  //uint_t max_filters = MIN (f->n_filters, out->length);
63  //uint_t max_length = MIN (in->length, f->filters->length);
64
65  // view cvec->norm as fvec->data
66  fvec_t tmp;
67  tmp.length = in->length;
68  tmp.data = in->norm;
69
70  fmat_vecmul(f->filters, &tmp, out);
[b276dee]71
72  return;
[fe28ff3]73}
[17961b0]74
[d95ff38]75fmat_t *
[feb694b]76aubio_filterbank_get_coeffs (const aubio_filterbank_t * f)
[3b3b03e]77{
[06cae6c]78  return f->filters;
[17961b0]79}
[33916b8]80
81uint_t
[feb694b]82aubio_filterbank_set_coeffs (aubio_filterbank_t * f, const fmat_t * filter_coeffs)
[33916b8]83{
[d95ff38]84  fmat_copy(filter_coeffs, f->filters);
[33916b8]85  return 0;
86}
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