source: src/spectral/dct_plain.c @ 4edba9d

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/timestretchfix/ffmpeg5
Last change on this file since 4edba9d was 813ced8, checked in by Paul Brossier <piem@piem.org>, 5 years ago

[dct] fail plain creation if size <= 0

  • Property mode set to 100644
File size: 3.2 KB
Line 
1/*
2  Copyright (C) 2018 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 "fmat.h"
24#include "spectral/dct.h"
25
26typedef struct _aubio_dct_plain_t aubio_dct_plain_t;
27
28struct _aubio_dct_plain_t {
29  uint_t size;
30  fmat_t *dct_coeffs;       /** DCT type II orthonormal transform, size * size */
31  fmat_t *idct_coeffs;      /** DCT type III orthonormal transform, size * size */
32};
33
34void del_aubio_dct_plain (aubio_dct_plain_t *s);
35
36aubio_dct_plain_t * new_aubio_dct_plain (uint_t size) {
37  aubio_dct_plain_t * s = AUBIO_NEW(aubio_dct_plain_t);
38  uint_t i, j;
39  smpl_t scaling;
40  if (aubio_is_power_of_two (size) == 1 && size > 16) {
41    AUBIO_WRN("dct_plain: using plain dct but size %d is a power of two\n", size);
42  }
43  if ((sint_t)size <= 0) {
44    AUBIO_ERR("dct_plain: can only create with size > 0, requested %d\n",
45        size);
46    goto failure;
47  }
48
49  s->size = size;
50
51  s->dct_coeffs = new_fmat (size, size);
52  s->idct_coeffs = new_fmat (size, size);
53
54  /* compute DCT type-II transformation matrix
55     dct_coeffs[j][i] = cos ( j * (i+.5) * PI / n_filters )
56  */
57  scaling = SQRT (2. / size);
58  for (i = 0; i < size; i++) {
59    for (j = 1; j < size; j++) {
60      s->dct_coeffs->data[j][i] =
61          scaling * COS (j * (i + 0.5) * PI / size );
62    }
63    s->dct_coeffs->data[0][i] = 1. / SQRT (size);
64  }
65
66  /* compute DCT type-III transformation matrix
67     idct_coeffs[j][i] = cos ( i * (j+.5) * PI / n_filters )
68  */
69  scaling = SQRT (2. / size);
70  for (j = 0; j < size; j++) {
71    for (i = 1; i < size; i++) {
72      s->idct_coeffs->data[j][i] =
73          scaling * COS (i * (j + 0.5) * PI / size );
74    }
75    s->idct_coeffs->data[j][0] = 1. / SQRT (size);
76  }
77  return s;
78failure:
79  del_aubio_dct_plain(s);
80  return NULL;
81}
82
83void del_aubio_dct_plain (aubio_dct_plain_t *s) {
84  if (s->dct_coeffs)
85    del_fmat(s->dct_coeffs);
86  if (s->idct_coeffs)
87    del_fmat(s->idct_coeffs);
88  AUBIO_FREE(s);
89}
90
91void aubio_dct_plain_do(aubio_dct_plain_t *s, const fvec_t *input, fvec_t *output) {
92  if (input->length != output->length || input->length != s->size) {
93    AUBIO_WRN("dct_plain: using input length %d, but output length = %d and size = %d\n",
94        input->length, output->length, s->size);
95  }
96  fmat_vecmul(s->dct_coeffs, input, output);
97}
98
99void aubio_dct_plain_rdo(aubio_dct_plain_t *s, const fvec_t *input, fvec_t *output) {
100  if (input->length != output->length || input->length != s->size) {
101    AUBIO_WRN("dct_plain: using input length %d, but output length = %d and size = %d\n",
102        input->length, output->length, s->size);
103  }
104  fmat_vecmul(s->idct_coeffs, input, output);
105}
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