source: src/spectral/dct_ooura.c @ fe6a9a23

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Last change on this file since fe6a9a23 was fe6a9a23, checked in by Paul Brossier <piem@piem.org>, 13 months ago

[dct] fail ooura creation if size <= 0

  • Property mode set to 100644
File size: 2.8 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
27typedef struct _aubio_dct_ooura_t aubio_dct_ooura_t;
28
29extern void aubio_ooura_ddct(int, int, smpl_t *, int *, smpl_t *);
30
31struct _aubio_dct_ooura_t {
32  uint_t size;
33  fvec_t *input;
34  smpl_t *w;
35  int *ip;
36  smpl_t scalers[5];
37};
38
39aubio_dct_ooura_t * new_aubio_dct_ooura (uint_t size) {
40  aubio_dct_ooura_t * s = AUBIO_NEW(aubio_dct_ooura_t);
41  if (aubio_is_power_of_two(size) != 1 || (sint_t)size <= 0) {
42    AUBIO_ERR("dct_ooura: can only create with sizes power of two, requested %d\n",
43        size);
44    goto beach;
45  }
46  s->size = size;
47  s->input = new_fvec(s->size);
48  s->w = AUBIO_ARRAY(smpl_t, s->size * 5 / 4);
49  s->ip = AUBIO_ARRAY(int, 3 + (1 << (int)FLOOR(LOG(s->size/2) / LOG(2))) / 2);
50  s->ip[0] = 0;
51  s->scalers[0] = 2. * SQRT(1./(4.*s->size));
52  s->scalers[1] = 2. * SQRT(1./(2.*s->size));
53  s->scalers[2] = 1. / s->scalers[0];
54  s->scalers[3] = 1. / s->scalers[1];
55  s->scalers[4] = 2. / s->size;
56  return s;
57beach:
58  AUBIO_FREE(s);
59  return NULL;
60}
61
62void del_aubio_dct_ooura(aubio_dct_ooura_t *s) {
63  del_fvec(s->input);
64  AUBIO_FREE(s->ip);
65  AUBIO_FREE(s->w);
66  AUBIO_FREE(s);
67}
68
69void aubio_dct_ooura_do(aubio_dct_ooura_t *s, const fvec_t *input, fvec_t *output) {
70  uint_t i = 0;
71  fvec_copy(input, s->input);
72  aubio_ooura_ddct(s->size, -1, s->input->data, s->ip, s->w);
73  // apply orthonormal scaling
74  s->input->data[0] *= s->scalers[0];
75  for (i = 1; i < s->input->length; i++) {
76    s->input->data[i] *= s->scalers[1];
77  }
78  fvec_copy(s->input, output);
79}
80
81void aubio_dct_ooura_rdo(aubio_dct_ooura_t *s, const fvec_t *input, fvec_t *output) {
82  uint_t i = 0;
83  fvec_copy(input, s->input);
84  s->input->data[0] *= s->scalers[2];
85  for (i = 1; i < s->input->length; i++) {
86    s->input->data[i] *= s->scalers[3];
87  }
88  s->input->data[0] *= .5;
89  aubio_ooura_ddct(s->size, 1, s->input->data, s->ip, s->w);
90  for (i = 0; i < s->input->length; i++) {
91    s->input->data[i] *= s->scalers[4];
92  }
93  fvec_copy(s->input, output);
94}
95
96#endif //!defined(HAVE_ACCELERATE) && !defined(HAVE_FFTW3)
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