source: src/spectral/dct_fftw.c @ 06baeb2

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Last change on this file since 06baeb2 was 06baeb2, checked in by Paul Brossier <piem@piem.org>, 2 years ago

src/spectral/dct_fftw.c: rename to aubio_dct_fftw

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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 "spectral/dct.h"
24
25#ifdef HAVE_FFTW3
26
27#include <fftw3.h>
28#include <pthread.h>
29
30#ifdef HAVE_FFTW3F
31#if HAVE_AUBIO_DOUBLE
32#error "Using aubio in double precision with fftw3 in single precision"
33#endif /* HAVE_AUBIO_DOUBLE */
34#else  /* HAVE_FFTW3F */
35#if !HAVE_AUBIO_DOUBLE
36#error "Using aubio in single precision with fftw3 in double precision"
37#endif /* HAVE_AUBIO_DOUBLE */
38#endif /* HAVE_FFTW3F */
39
40#ifdef HAVE_FFTW3F
41#define fftw_malloc            fftwf_malloc
42#define fftw_free              fftwf_free
43#define fftw_execute           fftwf_execute
44#define fftw_plan_dft_r2c_1d   fftwf_plan_dft_r2c_1d
45#define fftw_plan_dft_c2r_1d   fftwf_plan_dft_c2r_1d
46#define fftw_plan_r2r_1d       fftwf_plan_r2r_1d
47#define fftw_plan              fftwf_plan
48#define fftw_destroy_plan      fftwf_destroy_plan
49#endif
50
51// defined in src/spectral/fft.c
52extern pthread_mutex_t aubio_fftw_mutex;
53
54typedef struct _aubio_dct_fftw_t aubio_dct_fftw_t;
55
56struct _aubio_dct_fftw_t {
57  uint_t size;
58  fvec_t *in, *out;
59  smpl_t *data;
60  fftw_plan pfw, pbw;
61  smpl_t scalers[5];
62};
63
64aubio_dct_fftw_t * new_aubio_dct_fftw (uint_t size) {
65  aubio_dct_fftw_t * s = AUBIO_NEW(aubio_dct_fftw_t);
66  if (!s) {
67    goto beach;
68  }
69  s->size = size;
70  s->in = new_fvec(size);
71  s->out = new_fvec(size);
72  pthread_mutex_lock(&aubio_fftw_mutex);
73  s->data = (smpl_t *)fftw_malloc(sizeof(smpl_t) * size);
74  s->pfw = fftw_plan_r2r_1d(size, s->in->data,  s->data, FFTW_REDFT10,
75      FFTW_ESTIMATE);
76  s->pbw = fftw_plan_r2r_1d(size, s->data, s->out->data, FFTW_REDFT01,
77      FFTW_ESTIMATE);
78  pthread_mutex_unlock(&aubio_fftw_mutex);
79  s->scalers[0] = SQRT(1./(4.*s->size));
80  s->scalers[1] = SQRT(1./(2.*s->size));
81  s->scalers[2] = 1. / s->scalers[0];
82  s->scalers[3] = 1. / s->scalers[1];
83  s->scalers[4] = .5 / s->size;
84  return s;
85beach:
86  AUBIO_FREE(s);
87  return NULL;
88}
89
90void del_aubio_dct_fftw(aubio_dct_fftw_t *s) {
91  pthread_mutex_lock(&aubio_fftw_mutex);
92  fftw_destroy_plan(s->pfw);
93  fftw_destroy_plan(s->pbw);
94  fftw_free(s->data);
95  pthread_mutex_unlock(&aubio_fftw_mutex);
96  del_fvec(s->in);
97  del_fvec(s->out);
98  AUBIO_FREE(s);
99}
100
101void aubio_dct_fftw_do(aubio_dct_fftw_t *s, const fvec_t *input, fvec_t *output) {
102  uint_t i;
103  fvec_copy(input, s->in);
104  fftw_execute(s->pfw);
105  //fvec_copy(s->out, output);
106  s->data[0] *= s->scalers[0];
107  for (i = 1; i < s->size; i++) {
108    s->data[i] *= s->scalers[1];
109  }
110  memcpy(output->data, s->data, output->length * sizeof(smpl_t));
111}
112
113void aubio_dct_fftw_rdo(aubio_dct_fftw_t *s, const fvec_t *input, fvec_t *output) {
114  uint_t i;
115  memcpy(s->data, input->data, input->length * sizeof(smpl_t));
116  //s->data[0] *= .5;
117  s->data[0] *= s->scalers[2];
118  for (i = 1; i < s->size; i++) {
119    s->data[i] *= s->scalers[3];
120  }
121  fftw_execute(s->pbw);
122  for (i = 0; i < s->size; i++) {
123    s->out->data[i] *= s->scalers[4];
124  }
125  fvec_copy(s->out, output);
126}
127
128#endif //HAVE_FFTW3
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