source: src/spectral/phasevoc.c @ cd7d733

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since cd7d733 was cd7d733, checked in by Paul Brossier <piem@piem.org>, 11 years ago

src/spectral/phasevoc.c: do no reset hop size, just leave a commented warning

  • Property mode set to 100644
File size: 4.4 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 "spectral/fft.h"
25#include "spectral/phasevoc.h"
26
27/** phasevocoder internal object */
28struct _aubio_pvoc_t {
29  uint_t win_s;       /** grain length */
30  uint_t hop_s;       /** overlap step */
31  uint_t channels;    /** number of channels */
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  smpl_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  uint_t i,j;
51  for (i=0; i<pv->channels; i++) {
52    /* slide  */
53    aubio_pvoc_swapbuffers(pv->data->data[i],pv->dataold->data[i],
54        datanew->data[i],pv->win_s,pv->hop_s);
55    /* windowing */
56    for (j=0; j<pv->win_s; j++) pv->data->data[i][j] *= pv->w[j];
57  }
58  /* shift */
59  vec_shift(pv->data);
60  /* calculate fft */
61  aubio_fft_do (pv->fft,pv->data,fftgrain);
62}
63
64void aubio_pvoc_rdo(aubio_pvoc_t *pv,cvec_t * fftgrain, fvec_t * synthnew) {
65  uint_t i;
66  /* calculate rfft */
67  aubio_fft_rdo(pv->fft,fftgrain,pv->synth);
68  /* unshift */
69  vec_shift(pv->synth);
70  for (i=0; i<pv->channels; i++) {
71    aubio_pvoc_addsynth(pv->synth->data[i],pv->synthold->data[i],
72        synthnew->data[i],pv->win_s,pv->hop_s);
73  }
74}
75
76aubio_pvoc_t * new_aubio_pvoc (uint_t win_s, uint_t hop_s, uint_t channels) {
77  aubio_pvoc_t * pv = AUBIO_NEW(aubio_pvoc_t);
78
79  /* if (win_s < 2*hop_s) {
80    AUBIO_WRN("Hop size bigger than half the window size!\n");
81  } */
82
83  if (hop_s < 1) {
84    AUBIO_ERR("Hop size is smaller than 1!\n");
85    AUBIO_ERR("Resetting hop size to half the window size.\n");
86    hop_s = win_s / 2;
87  }
88
89  pv->fft      = new_aubio_fft(win_s,channels);
90
91  /* remember old */
92  pv->data     = new_fvec (win_s, channels);
93  pv->synth    = new_fvec (win_s, channels);
94
95  /* new input output */
96  pv->dataold  = new_fvec  (win_s-hop_s, channels);
97  pv->synthold = new_fvec (win_s-hop_s, channels);
98  pv->w        = AUBIO_ARRAY(smpl_t,win_s);
99  aubio_window(pv->w,win_s,aubio_win_hanningz);
100
101  pv->channels = channels;
102  pv->hop_s    = hop_s;
103  pv->win_s    = win_s;
104
105  return pv;
106}
107
108void del_aubio_pvoc(aubio_pvoc_t *pv) {
109  del_fvec(pv->data);
110  del_fvec(pv->synth);
111  del_fvec(pv->dataold);
112  del_fvec(pv->synthold);
113  del_aubio_fft(pv->fft);
114  AUBIO_FREE(pv->w);
115  AUBIO_FREE(pv);
116}
117
118static void aubio_pvoc_swapbuffers(smpl_t * data, smpl_t * dataold, 
119    const smpl_t * datanew, uint_t win_s, uint_t hop_s)
120{
121  uint_t i;
122  for (i=0;i<win_s-hop_s;i++)
123    data[i] = dataold[i];
124  for (i=0;i<hop_s;i++)
125    data[win_s-hop_s+i] = datanew[i];
126  for (i=0;i<win_s-hop_s;i++)
127    dataold[i] = data[i+hop_s];
128}
129
130static void aubio_pvoc_addsynth(const smpl_t * synth, smpl_t * synthold, 
131                smpl_t * synthnew, uint_t win_s, uint_t hop_s)
132{
133  uint_t i;
134  smpl_t scale = 2*hop_s/(win_s+.0);
135  /* add new synth to old one and put result in synthnew */
136  for (i=0;i<hop_s;i++)
137    synthnew[i] = synthold[i]+synth[i]*scale;
138  /* shift synthold */
139  for (i=0;i<win_s-2*hop_s;i++)
140    synthold[i] = synthold[i+hop_s];
141  /* erase last frame in synthold */
142  for (i=win_s-hop_s;i<win_s;i++)
143    synthold[i-hop_s]=0.;
144  /* additive synth */
145  for (i=0;i<win_s-hop_s;i++)
146    synthold[i] += synth[i+hop_s]*scale;
147}
148
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