source: src/utils/scale.c @ 55d1fa4

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 55d1fa4 was 55d1fa4, checked in by Paul Brossier <piem@piem.org>, 3 years ago

src/utils/: add const qualifiers

  • Property mode set to 100644
File size: 1.9 KB
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1/*
2  Copyright (C) 2003-2009 Paul Brossier <piem@aubio.org>
3
4  This file is part of aubio.
5
6  aubio is free software: you can redistribute it and/or modify
7  it under the terms of the GNU General Public License as published by
8  the Free Software Foundation, either version 3 of the License, or
9  (at your option) any later version.
10
11  aubio is distributed in the hope that it will be useful,
12  but WITHOUT ANY WARRANTY; without even the implied warranty of
13  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14  GNU General Public License for more details.
15
16  You should have received a copy of the GNU General Public License
17  along with aubio.  If not, see <http://www.gnu.org/licenses/>.
18
19*/
20
21#include "aubio_priv.h"
22#include "fvec.h"
23#include "utils/scale.h"
24
25struct _aubio_scale_t {
26  smpl_t ilow;
27  smpl_t ihig;
28  smpl_t olow;
29  smpl_t ohig;
30
31  smpl_t scaler;
32  smpl_t irange;
33
34  /* not implemented yet : type in/out data
35     bool inint;
36     bool outint;
37     */
38};
39
40aubio_scale_t * new_aubio_scale (smpl_t ilow, smpl_t ihig,
41    smpl_t olow, smpl_t ohig) {
42  aubio_scale_t * s = AUBIO_NEW(aubio_scale_t);
43  aubio_scale_set_limits (s, ilow, ihig, olow, ohig);
44  return s;
45}
46
47void del_aubio_scale(aubio_scale_t *s) {
48  AUBIO_FREE(s);
49}
50
51uint_t aubio_scale_set_limits (aubio_scale_t *s, smpl_t ilow, smpl_t ihig,
52    smpl_t olow, smpl_t ohig) {
53  smpl_t inputrange = ihig - ilow;
54  smpl_t outputrange= ohig - olow;
55  s->ilow = ilow;
56  s->ihig = ihig;
57  s->olow = olow;
58  s->ohig = ohig;
59  if (inputrange == 0) {
60    s->scaler = 0.0;
61  } else {
62    s->scaler = outputrange/inputrange;
63    if (inputrange < 0) {
64      inputrange = inputrange * -1.0f;
65    }
66  }
67  return AUBIO_OK;
68}
69
70void aubio_scale_do (aubio_scale_t *s, fvec_t *input) 
71{
72  uint_t j;
73  for (j=0;  j < input->length; j++){
74    input->data[j] -= s->ilow;
75    input->data[j] *= s->scaler;
76    input->data[j] += s->olow;
77  }
78}
79
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