source: src/spectral/dct_ooura.c @ 8c50194

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5
Last change on this file since 8c50194 was 1f112cc, checked in by Paul Brossier <piem@piem.org>, 6 years ago

src/spectral/dct_*.c: remove unused cvec.h

  • Property mode set to 100644
File size: 2.7 KB
Line 
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 "spectral/dct.h"
24
25#if !defined(HAVE_ACCELERATE) && !defined(HAVE_FFTW3) && !defined(HAVE_INTEL_IPP)
26
27extern void aubio_ooura_ddct(int, int, smpl_t *, int *, smpl_t *);
28
29struct _aubio_dct_t {
30  uint_t size;
31  fvec_t *input;
32  smpl_t *w;
33  int *ip;
34  smpl_t scalers[5];
35};
36
37aubio_dct_t * new_aubio_dct (uint_t size) {
38  aubio_dct_t * s = AUBIO_NEW(aubio_dct_t);
39  if (aubio_is_power_of_two(size) != 1) {
40    AUBIO_ERR("dct: can only create with sizes power of two, requested %d\n",
41        size);
42    goto beach;
43  }
44  s->size = size;
45  s->input = new_fvec(s->size);
46  s->w = AUBIO_ARRAY(smpl_t, s->size * 5 / 4);
47  s->ip = AUBIO_ARRAY(int, 3 + (1 << (int)FLOOR(LOG(s->size/2) / LOG(2))) / 2);
48  s->ip[0] = 0;
49  s->scalers[0] = 2. * SQRT(1./(4.*s->size));
50  s->scalers[1] = 2. * SQRT(1./(2.*s->size));
51  s->scalers[2] = 1. / s->scalers[0];
52  s->scalers[3] = 1. / s->scalers[1];
53  s->scalers[4] = 2. / s->size;
54  return s;
55beach:
56  AUBIO_FREE(s);
57  return NULL;
58}
59
60void del_aubio_dct(aubio_dct_t *s) {
61  del_fvec(s->input);
62  AUBIO_FREE(s->ip);
63  AUBIO_FREE(s->w);
64  AUBIO_FREE(s);
65}
66
67void aubio_dct_do(aubio_dct_t *s, const fvec_t *input, fvec_t *output) {
68  uint_t i = 0;
69  fvec_copy(input, s->input);
70  aubio_ooura_ddct(s->size, -1, s->input->data, s->ip, s->w);
71  // apply orthonormal scaling
72  s->input->data[0] *= s->scalers[0];
73  for (i = 1; i < s->input->length; i++) {
74    s->input->data[i] *= s->scalers[1];
75  }
76  fvec_copy(s->input, output);
77}
78
79void aubio_dct_rdo(aubio_dct_t *s, const fvec_t *input, fvec_t *output) {
80  uint_t i = 0;
81  fvec_copy(input, s->input);
82  s->input->data[0] *= s->scalers[2];
83  for (i = 1; i < s->input->length; i++) {
84    s->input->data[i] *= s->scalers[3];
85  }
86  s->input->data[0] *= .5;
87  aubio_ooura_ddct(s->size, 1, s->input->data, s->ip, s->w);
88  for (i = 0; i < s->input->length; i++) {
89    s->input->data[i] *= s->scalers[4];
90  }
91  fvec_copy(s->input, output);
92}
93
94#endif //!defined(HAVE_ACCELERATE) && !defined(HAVE_FFTW3)
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