source: src/tempo/tempo.c @ b173ca1

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since b173ca1 was d207300, checked in by Paul Brossier <piem@piem.org>, 10 years ago

src/tempo: switch to mono

  • Property mode set to 100644
File size: 5.0 KB
Line 
1/*
2  Copyright (C) 2006-2009 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 "spectral/specdesc.h"
25#include "tempo/beattracking.h"
26#include "spectral/phasevoc.h"
27#include "onset/peakpicker.h"
28#include "mathutils.h"
29#include "tempo/tempo.h"
30
31/* structure to store object state */
32struct _aubio_tempo_t {
33  aubio_specdesc_t * od;   /** onset detection */
34  aubio_pvoc_t * pv;             /** phase vocoder */
35  aubio_peakpicker_t * pp;       /** peak picker */
36  aubio_beattracking_t * bt;     /** beat tracking */
37  cvec_t * fftgrain;             /** spectral frame */
38  fvec_t * of;                   /** onset detection function value */
39  fvec_t * dfframe;              /** peak picked detection function buffer */
40  fvec_t * out;                  /** beat tactus candidates */
41  fvec_t * onset;                /** onset results */
42  smpl_t silence;                /** silence parameter */
43  smpl_t threshold;              /** peak picking threshold */
44  sint_t blockpos;               /** current position in dfframe */
45  uint_t winlen;                 /** dfframe bufsize */
46  uint_t step;                   /** dfframe hopsize */ 
47  uint_t samplerate;             /** sampling rate of the signal */ 
48};
49
50/* execute tempo detection function on iput buffer */
51void aubio_tempo_do(aubio_tempo_t *o, fvec_t * input, fvec_t * tempo)
52{
53  uint_t i;
54  uint_t winlen = o->winlen;
55  uint_t step   = o->step;
56  fvec_t * thresholded;
57  aubio_pvoc_do (o->pv, input, o->fftgrain);
58  aubio_specdesc_do (o->od, o->fftgrain, o->of);
59  /*if (usedoubled) {
60    aubio_specdesc_do(o2,fftgrain, onset2);
61    onset->data[0] *= onset2->data[0];
62  }*/
63  /* execute every overlap_size*step */
64  if (o->blockpos == (signed)step -1 ) {
65    /* check dfframe */
66    aubio_beattracking_do(o->bt,o->dfframe,o->out);
67    /* rotate dfframe */
68    for (i = 0 ; i < winlen - step; i++ ) 
69      o->dfframe->data[i] = o->dfframe->data[i+step];
70    for (i = winlen - step ; i < winlen; i++ ) 
71      o->dfframe->data[i] = 0.;
72    o->blockpos = -1;
73  }
74  o->blockpos++;
75  aubio_peakpicker_do (o->pp, o->of, o->onset);
76  tempo->data[1] = o->onset->data[0];
77  thresholded = aubio_peakpicker_get_thresholded_input(o->pp);
78  o->dfframe->data[winlen - step + o->blockpos] = thresholded->data[0];
79  /* end of second level loop */
80  tempo->data[0] = 0; /* reset tactus */
81  i=0;
82  for (i = 1; i < o->out->data[0]; i++ ) {
83    /* if current frame is a predicted tactus */
84    if (o->blockpos == FLOOR(o->out->data[i])) {
85      tempo->data[0] = o->out->data[i] - FLOOR(o->out->data[i]); /* set tactus */
86      /* test for silence */
87      if (aubio_silence_detection(input, o->silence)==1) {
88        tempo->data[1] = 0; /* unset onset */
89      }
90    }
91  }
92}
93
94uint_t aubio_tempo_set_silence(aubio_tempo_t * o, smpl_t silence) {
95  o->silence = silence;
96  return AUBIO_OK;
97}
98
99uint_t aubio_tempo_set_threshold(aubio_tempo_t * o, smpl_t threshold) {
100  o->threshold = threshold;
101  aubio_peakpicker_set_threshold(o->pp, o->threshold);
102  return AUBIO_OK;
103}
104
105/* Allocate memory for an tempo detection */
106aubio_tempo_t * new_aubio_tempo (char_t * onset_mode, 
107    uint_t buf_size, uint_t hop_size, uint_t samplerate)
108{
109  aubio_tempo_t * o = AUBIO_NEW(aubio_tempo_t);
110  o->samplerate = samplerate;
111  o->winlen = SQR(512)/hop_size;
112  o->step = o->winlen/4;
113  o->blockpos = 0;
114  o->threshold = 0.3;
115  o->silence = -90.;
116  o->blockpos = 0;
117  o->dfframe  = new_fvec(o->winlen);
118  o->fftgrain = new_cvec(buf_size);
119  o->out      = new_fvec(o->step);
120  o->pv       = new_aubio_pvoc(buf_size, hop_size);
121  o->pp       = new_aubio_peakpicker();
122  aubio_peakpicker_set_threshold (o->pp, o->threshold);
123  o->od       = new_aubio_specdesc(onset_mode,buf_size);
124  o->of       = new_fvec(1);
125  o->bt       = new_aubio_beattracking(o->winlen);
126  o->onset    = new_fvec(1);
127  /*if (usedoubled)    {
128    o2 = new_aubio_specdesc(type_onset2,buffer_size);
129    onset2 = new_fvec(1);
130  }*/
131  return o;
132}
133
134smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) {
135  return aubio_beattracking_get_bpm(o->bt);
136}
137
138smpl_t aubio_tempo_get_confidence(aubio_tempo_t *o) {
139  return aubio_beattracking_get_confidence(o->bt);
140}
141
142void del_aubio_tempo (aubio_tempo_t *o)
143{
144  del_aubio_specdesc(o->od);
145  del_aubio_beattracking(o->bt);
146  del_aubio_peakpicker(o->pp);
147  del_aubio_pvoc(o->pv);
148  del_fvec(o->out);
149  del_fvec(o->of);
150  del_cvec(o->fftgrain);
151  del_fvec(o->dfframe);
152  del_fvec(o->onset);
153  AUBIO_FREE(o);
154  return;
155}
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