source: src/spectral/dct_ooura.c @ 3873e5e

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5
Last change on this file since 3873e5e was 3873e5e, checked in by Paul Brossier <piem@piem.org>, 7 years ago

src/spectral/dct_ooura.c: further optimize by computing scaling factors once

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File size: 2.5 KB
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1/*
2  Copyright (C) 2017 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 "cvec.h"
24#include "spectral/dct.h"
25
26extern void aubio_ooura_ddct(int, int, smpl_t *, int *, smpl_t *);
27
28struct _aubio_dct_t {
29  uint_t size;
30  fvec_t *input;
31  smpl_t *w;
32  int *ip;
33  smpl_t scalers[5];
34};
35
36aubio_dct_t * new_aubio_dct (uint_t size) {
37  aubio_dct_t * s = AUBIO_NEW(aubio_dct_t);
38  if (aubio_is_power_of_two(size) != 1) {
39    AUBIO_ERR("dct: can only create with sizes power of two, requested %d\n",
40        size);
41    goto beach;
42  }
43  s->size = size;
44  s->input = new_fvec(s->size);
45  s->w = AUBIO_ARRAY(smpl_t, s->size * 5 / 4);
46  s->ip = AUBIO_ARRAY(int, 3 + (1 << (int)FLOOR(LOG(s->size/2) / LOG(2))) / 2);
47  s->ip[0] = 0;
48  s->scalers[0] = 2. * SQRT(1./(4.*s->size));
49  s->scalers[1] = 2. * SQRT(1./(2.*s->size));
50  s->scalers[2] = 1. / s->scalers[0];
51  s->scalers[3] = 1. / s->scalers[1];
52  s->scalers[4] = 2. / s->size;
53  return s;
54beach:
55  AUBIO_FREE(s);
56  return NULL;
57}
58
59void del_aubio_dct(aubio_dct_t *s) {
60  del_fvec(s->input);
61  AUBIO_FREE(s->ip);
62  AUBIO_FREE(s->w);
63  AUBIO_FREE(s);
64}
65
66void aubio_dct_do(aubio_dct_t *s, const fvec_t *input, fvec_t *output) {
67  uint_t i = 0;
68  fvec_copy(input, s->input);
69  aubio_ooura_ddct(s->size, -1, s->input->data, s->ip, s->w);
70  // apply orthonormal scaling
71  s->input->data[0] *= s->scalers[0];
72  for (i = 1; i < s->input->length; i++) {
73    s->input->data[i] *= s->scalers[1];
74  }
75  fvec_copy(s->input, output);
76}
77
78void aubio_dct_rdo(aubio_dct_t *s, const fvec_t *input, fvec_t *output) {
79  uint_t i = 0;
80  fvec_copy(input, s->input);
81  s->input->data[0] *= s->scalers[2];
82  for (i = 1; i < s->input->length; i++) {
83    s->input->data[i] *= s->scalers[3];
84  }
85  s->input->data[0] *= .5;
86  aubio_ooura_ddct(s->size, 1, s->input->data, s->ip, s->w);
87  for (i = 0; i < s->input->length; i++) {
88    s->input->data[i] *= s->scalers[4];
89  }
90  fvec_copy(s->input, output);
91}
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