source: src/fft.c @ aadd27a

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since aadd27a was aadd27a, checked in by Paul Brossier <piem@piem.org>, 16 years ago

fft.c,fft.h: refactorised, no more mfft, only one fft

  • Property mode set to 100644
File size: 5.9 KB
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1/*
2   Copyright (C) 2003 Paul Brossier
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; if not, write to the Free Software
16   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17
18*/
19
20#include "aubio_priv.h"
21#include "fvec.h"
22#include "cvec.h"
23#include "mathutils.h"
24#include "fft.h"
25
26#if FFTW3F_SUPPORT
27#define fftw_malloc            fftwf_malloc
28#define fftw_free              fftwf_free
29#define fftw_execute           fftwf_execute
30#define fftw_plan_dft_r2c_1d   fftwf_plan_dft_r2c_1d
31#define fftw_plan_dft_c2r_1d   fftwf_plan_dft_c2r_1d
32#define fftw_plan_r2r_1d       fftwf_plan_r2r_1d
33#define fftw_plan              fftwf_plan
34#define fftw_destroy_plan      fftwf_destroy_plan
35#endif
36
37#if FFTW3F_SUPPORT
38#define real_t smpl_t
39#else
40#define real_t lsmp_t
41#endif
42
43struct _aubio_fft_t {
44  uint_t winsize;
45  uint_t channels;
46  uint_t fft_size;
47  real_t *in, *out;
48  fftw_plan   pfw, pbw;
49  fft_data_t * specdata;     /* complex spectral data */
50  fvec_t * compspec;
51};
52
53aubio_fft_t * new_aubio_fft(uint_t winsize, uint_t channels) {
54  aubio_fft_t * s = AUBIO_NEW(aubio_fft_t);
55  s->winsize  = winsize;
56  s->channels = channels;
57  /* allocate memory */
58  s->in       = AUBIO_ARRAY(real_t,winsize);
59  s->out      = AUBIO_ARRAY(real_t,winsize);
60  s->compspec = new_fvec(winsize,channels);
61  /* create plans */
62#ifdef HAVE_COMPLEX_H
63  s->fft_size = winsize/2+1;
64  s->specdata = (fft_data_t*)fftw_malloc(sizeof(fft_data_t)*s->fft_size);
65  s->pfw = fftw_plan_dft_r2c_1d(winsize, s->in,  s->specdata, FFTW_ESTIMATE);
66  s->pbw = fftw_plan_dft_c2r_1d(winsize, s->specdata, s->out, FFTW_ESTIMATE);
67#else
68  s->fft_size = winsize;
69  s->specdata = (fft_data_t*)fftw_malloc(sizeof(fft_data_t)*s->fft_size);
70  s->pfw = fftw_plan_r2r_1d(winsize, s->in,  s->specdata, FFTW_R2HC, FFTW_ESTIMATE);
71  s->pbw = fftw_plan_r2r_1d(winsize, s->specdata, s->out, FFTW_HC2R, FFTW_ESTIMATE);
72#endif
73  return s;
74}
75
76void del_aubio_fft(aubio_fft_t * s) {
77  /* destroy data */
78  del_fvec(s->compspec);
79  fftw_destroy_plan(s->pfw);
80  fftw_destroy_plan(s->pbw);
81  fftw_free(s->specdata);
82  AUBIO_FREE(s->out);
83  AUBIO_FREE(s->in );
84  AUBIO_FREE(s);
85}
86
87void aubio_fft_do(aubio_fft_t * s, fvec_t * input, cvec_t * spectrum) {
88  aubio_fft_do_complex(s, input, s->compspec);
89  aubio_fft_get_spectrum(s->compspec, spectrum);
90}
91
92void aubio_fft_rdo(aubio_fft_t * s, cvec_t * spectrum, fvec_t * output) {
93  aubio_fft_get_realimag(spectrum, s->compspec);
94  aubio_fft_rdo_complex(s, s->compspec, output);
95}
96
97void aubio_fft_do_complex(aubio_fft_t * s, fvec_t * input, fvec_t * compspec) {
98  uint_t i, j;
99  for (i = 0; i < s->channels; i++) {
100    for (j=0; j < s->winsize; j++) {
101      s->in[j] = input->data[i][j];
102    }
103    fftw_execute(s->pfw);
104#if HAVE_COMPLEX_H
105    compspec->data[i][0] = REAL(s->specdata[0]);
106    for (j = 1; j < s->fft_size -1 ; j++) {
107      compspec->data[i][j] = REAL(s->specdata[j]);
108      compspec->data[i][compspec->length - j] = IMAG(s->specdata[j]);
109    }
110    compspec->data[i][s->fft_size-1] = REAL(s->specdata[s->fft_size-1]);
111#else
112    for (j = 0; j < s->fft_size; j++) {
113      compspec->data[i][j] = s->specdata[j];
114    }
115#endif
116  }
117}
118
119void aubio_fft_rdo_complex(aubio_fft_t * s, fvec_t * compspec, fvec_t * output) {
120  uint_t i, j;
121  const smpl_t renorm = 1./(smpl_t)s->winsize;
122  for (i = 0; i < compspec->channels; i++) {
123#if HAVE_COMPLEX_H
124    s->specdata[0] = compspec->data[i][0];
125    for (j=1; j < s->fft_size - 1; j++) {
126      s->specdata[j] = compspec->data[i][j] + 
127        I * compspec->data[i][compspec->length - j];
128    }
129    s->specdata[s->fft_size - 1] = compspec->data[i][s->fft_size - 1];
130#else
131    for (j=0; j < s->fft_size; j++) {
132      s->specdata[j] = compspec->data[i][j];
133    }
134#endif
135    fftw_execute(s->pbw);
136    for (j = 0; j < output->length; j++) {
137      output->data[i][j] = s->out[j]*renorm;
138    }
139  }
140}
141
142void aubio_fft_get_spectrum(fvec_t * compspec, cvec_t * spectrum) {
143  aubio_fft_get_phas(compspec, spectrum);
144  aubio_fft_get_norm(compspec, spectrum);
145}
146
147void aubio_fft_get_realimag(cvec_t * spectrum, fvec_t * compspec) {
148  aubio_fft_get_imag(spectrum, compspec);
149  aubio_fft_get_real(spectrum, compspec);
150}
151
152void aubio_fft_get_phas(fvec_t * compspec, cvec_t * spectrum) {
153  uint_t i, j;
154  for (i = 0; i < spectrum->channels; i++) {
155    spectrum->phas[i][0] = 0.;
156    for (j=1; j < spectrum->length - 1; j++) {
157      spectrum->phas[i][j] = atan2f(compspec->data[i][compspec->length-j],
158          compspec->data[i][j]);
159    }
160    spectrum->phas[i][spectrum->length-1] = 0.;
161  }
162}
163
164void aubio_fft_get_norm(fvec_t * compspec, cvec_t * spectrum) {
165  uint_t i, j = 0;
166  for (i = 0; i < spectrum->channels; i++) {
167    spectrum->norm[i][0] = compspec->data[i][0];
168    for (j=1; j < spectrum->length - 1; j++) {
169      spectrum->norm[i][j] = SQRT(SQR(compspec->data[i][j]) 
170          + SQR(compspec->data[i][compspec->length - j]) );
171    }
172    spectrum->norm[i][spectrum->length-1] = compspec->data[i][compspec->length/2];
173  }
174}
175
176void aubio_fft_get_imag(cvec_t * spectrum, fvec_t * compspec) {
177  uint_t i, j;
178  for (i = 0; i < compspec->channels; i++) {
179    for (j = 1; j < compspec->length / 2 + 1; j++) {
180      compspec->data[i][compspec->length - j] =
181        spectrum->norm[i][j]*SIN(spectrum->phas[i][j]);
182    }
183  }
184}
185
186void aubio_fft_get_real(cvec_t * spectrum, fvec_t * compspec) {
187  uint_t i, j;
188  for (i = 0; i < compspec->channels; i++) {
189    for (j = 0; j< compspec->length / 2 + 1; j++) {
190      compspec->data[i][j] = 
191        spectrum->norm[i][j]*COS(spectrum->phas[i][j]);
192    }
193  }
194}
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