source: src/spectral/phasevoc.c @ d6001bf

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since d6001bf was d95ff38, checked in by Paul Brossier <piem@piem.org>, 15 years ago

src/spectral: switch to mono

  • Property mode set to 100644
File size: 4.1 KB
Line 
1/*
2  Copyright (C) 2003-2009 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 "cvec.h"
24#include "mathutils.h"
25#include "spectral/fft.h"
26#include "spectral/phasevoc.h"
27
28/** phasevocoder internal object */
29struct _aubio_pvoc_t {
30  uint_t win_s;       /** grain length */
31  uint_t hop_s;       /** overlap step */
32  aubio_fft_t * fft;  /** fft object */
33  fvec_t * synth;     /** cur output grain [win_s] */
34  fvec_t * synthold;  /** last input frame [win_s-hop_s] */
35  fvec_t * data;      /** current input grain [win_s] */
36  fvec_t * dataold;   /** last input frame [win_s-hop_s] */
37  fvec_t * w;         /** grain window [win_s] */
38};
39
40
41/** returns data and dataold slided by hop_s */
42static void aubio_pvoc_swapbuffers(smpl_t * data, smpl_t * dataold, const
43    smpl_t * datanew, uint_t win_s, uint_t hop_s);
44
45/** do additive synthesis from 'old' and 'cur' */
46static void aubio_pvoc_addsynth(const smpl_t * synth, smpl_t * synthold,
47    smpl_t * synthnew, uint_t win_s, uint_t hop_s);
48
49void aubio_pvoc_do(aubio_pvoc_t *pv, fvec_t * datanew, cvec_t *fftgrain) {
50  /* slide  */
51  aubio_pvoc_swapbuffers(pv->data->data,pv->dataold->data,
52      datanew->data,pv->win_s,pv->hop_s);
53  /* windowing */
54  fvec_weight(pv->data, pv->w);
55  /* shift */
56  fvec_shift(pv->data);
57  /* calculate fft */
58  aubio_fft_do (pv->fft,pv->data,fftgrain);
59}
60
61void aubio_pvoc_rdo(aubio_pvoc_t *pv,cvec_t * fftgrain, fvec_t * synthnew) {
62  /* calculate rfft */
63  aubio_fft_rdo(pv->fft,fftgrain,pv->synth);
64  /* unshift */
65  fvec_shift(pv->synth);
66  aubio_pvoc_addsynth(pv->synth->data,pv->synthold->data,
67      synthnew->data,pv->win_s,pv->hop_s);
68}
69
70aubio_pvoc_t * new_aubio_pvoc (uint_t win_s, uint_t hop_s) {
71  aubio_pvoc_t * pv = AUBIO_NEW(aubio_pvoc_t);
72
73  /* if (win_s < 2*hop_s) {
74    AUBIO_WRN("Hop size bigger than half the window size!\n");
75  } */
76
77  if (hop_s < 1) {
78    AUBIO_ERR("Hop size is smaller than 1!\n");
79    AUBIO_ERR("Resetting hop size to half the window size.\n");
80    hop_s = win_s / 2;
81  }
82
83  pv->fft      = new_aubio_fft (win_s);
84
85  /* remember old */
86  pv->data     = new_fvec (win_s);
87  pv->synth    = new_fvec (win_s);
88
89  /* new input output */
90  pv->dataold  = new_fvec  (win_s-hop_s);
91  pv->synthold = new_fvec (win_s-hop_s);
92  pv->w        = new_aubio_window ("hanningz", win_s);
93
94  pv->hop_s    = hop_s;
95  pv->win_s    = win_s;
96
97  return pv;
98}
99
100void del_aubio_pvoc(aubio_pvoc_t *pv) {
101  del_fvec(pv->data);
102  del_fvec(pv->synth);
103  del_fvec(pv->dataold);
104  del_fvec(pv->synthold);
105  del_fvec(pv->w);
106  del_aubio_fft(pv->fft);
107  AUBIO_FREE(pv);
108}
109
110static void aubio_pvoc_swapbuffers(smpl_t * data, smpl_t * dataold, 
111    const smpl_t * datanew, uint_t win_s, uint_t hop_s)
112{
113  uint_t i;
114  for (i=0;i<win_s-hop_s;i++)
115    data[i] = dataold[i];
116  for (i=0;i<hop_s;i++)
117    data[win_s-hop_s+i] = datanew[i];
118  for (i=0;i<win_s-hop_s;i++)
119    dataold[i] = data[i+hop_s];
120}
121
122static void aubio_pvoc_addsynth(const smpl_t * synth, smpl_t * synthold, 
123                smpl_t * synthnew, uint_t win_s, uint_t hop_s)
124{
125  uint_t i;
126  smpl_t scale = 2*hop_s/(win_s+.0);
127  /* add new synth to old one and put result in synthnew */
128  for (i=0;i<hop_s;i++)
129    synthnew[i] = synthold[i]+synth[i]*scale;
130  /* shift synthold */
131  for (i=0;i<win_s-2*hop_s;i++)
132    synthold[i] = synthold[i+hop_s];
133  /* erase last frame in synthold */
134  for (i=win_s-hop_s;i<win_s;i++)
135    synthold[i-hop_s]=0.;
136  /* additive synth */
137  for (i=0;i<win_s-hop_s;i++)
138    synthold[i] += synth[i+hop_s]*scale;
139}
140
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