source: src/tempo/tempo.c @ 77db425

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 77db425 was 77db425, checked in by Paul Brossier <piem@piem.org>, 6 years ago

src/tempo/tempo.c: fix for different samplerates

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File size: 6.1 KB
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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  uint_t hop_size;               /** get hop_size */
49  uint_t total_frames;           /** total frames since beginning */
50  uint_t last_beat;              /** time of latest detected beat, in samples */
51  uint_t delay;                  /** delay to remove to last beat, in samples */
52};
53
54/* execute tempo detection function on iput buffer */
55void aubio_tempo_do(aubio_tempo_t *o, fvec_t * input, fvec_t * tempo)
56{
57  uint_t i;
58  uint_t winlen = o->winlen;
59  uint_t step   = o->step;
60  fvec_t * thresholded;
61  aubio_pvoc_do (o->pv, input, o->fftgrain);
62  aubio_specdesc_do (o->od, o->fftgrain, o->of);
63  /*if (usedoubled) {
64    aubio_specdesc_do(o2,fftgrain, onset2);
65    onset->data[0] *= onset2->data[0];
66  }*/
67  /* execute every overlap_size*step */
68  if (o->blockpos == (signed)step -1 ) {
69    /* check dfframe */
70    aubio_beattracking_do(o->bt,o->dfframe,o->out);
71    /* rotate dfframe */
72    for (i = 0 ; i < winlen - step; i++ ) 
73      o->dfframe->data[i] = o->dfframe->data[i+step];
74    for (i = winlen - step ; i < winlen; i++ ) 
75      o->dfframe->data[i] = 0.;
76    o->blockpos = -1;
77  }
78  o->blockpos++;
79  aubio_peakpicker_do (o->pp, o->of, o->onset);
80  tempo->data[1] = o->onset->data[0];
81  thresholded = aubio_peakpicker_get_thresholded_input(o->pp);
82  o->dfframe->data[winlen - step + o->blockpos] = thresholded->data[0];
83  /* end of second level loop */
84  tempo->data[0] = 0; /* reset tactus */
85  i=0;
86  for (i = 1; i < o->out->data[0]; i++ ) {
87    /* if current frame is a predicted tactus */
88    if (o->blockpos == FLOOR(o->out->data[i])) {
89      tempo->data[0] = o->out->data[i] - FLOOR(o->out->data[i]); /* set tactus */
90      /* test for silence */
91      /*
92      if (aubio_silence_detection(input, o->silence)==1) {
93        tempo->data[0] = 0; // unset beat if silent
94      }
95      */
96      o->last_beat = o->total_frames + (uint_t)ROUND(tempo->data[0] * o->hop_size);
97    }
98  }
99  o->total_frames += o->hop_size;
100  return;
101}
102
103uint_t aubio_tempo_get_last (aubio_tempo_t *o)
104{
105  return o->last_beat - o->delay;
106}
107
108smpl_t aubio_tempo_get_last_s (aubio_tempo_t *o)
109{
110  return aubio_tempo_get_last (o) / (smpl_t) (o->samplerate);
111}
112
113smpl_t aubio_tempo_get_last_ms (aubio_tempo_t *o)
114{
115  return aubio_tempo_get_last_s (o) * 1000.;
116}
117
118uint_t aubio_tempo_set_delay(aubio_tempo_t * o, uint_t delay) {
119  o->delay = delay;
120  return AUBIO_OK;
121}
122
123uint_t aubio_tempo_get_delay(aubio_tempo_t * o) {
124  return o->delay;
125}
126
127uint_t aubio_tempo_set_silence(aubio_tempo_t * o, smpl_t silence) {
128  o->silence = silence;
129  return AUBIO_OK;
130}
131
132uint_t aubio_tempo_set_threshold(aubio_tempo_t * o, smpl_t threshold) {
133  o->threshold = threshold;
134  aubio_peakpicker_set_threshold(o->pp, o->threshold);
135  return AUBIO_OK;
136}
137
138/* Allocate memory for an tempo detection */
139aubio_tempo_t * new_aubio_tempo (char_t * onset_mode, 
140    uint_t buf_size, uint_t hop_size, uint_t samplerate)
141{
142  aubio_tempo_t * o = AUBIO_NEW(aubio_tempo_t);
143  o->samplerate = samplerate;
144  /* length of observations, worth about 6 seconds */
145  o->winlen = aubio_next_power_of_two(5.8 * samplerate / hop_size);
146  o->step = o->winlen/4;
147  o->blockpos = 0;
148  o->threshold = 0.3;
149  o->silence = -90.;
150  o->total_frames = 0;
151  o->last_beat = 0;
152  o->delay = 0;
153  o->hop_size = hop_size;
154  o->dfframe  = new_fvec(o->winlen);
155  o->fftgrain = new_cvec(buf_size);
156  o->out      = new_fvec(o->step);
157  o->pv       = new_aubio_pvoc(buf_size, hop_size);
158  o->pp       = new_aubio_peakpicker();
159  aubio_peakpicker_set_threshold (o->pp, o->threshold);
160  o->od       = new_aubio_specdesc(onset_mode,buf_size);
161  o->of       = new_fvec(1);
162  o->bt       = new_aubio_beattracking(o->winlen, o->hop_size, o->samplerate);
163  o->onset    = new_fvec(1);
164  /*if (usedoubled)    {
165    o2 = new_aubio_specdesc(type_onset2,buffer_size);
166    onset2 = new_fvec(1);
167  }*/
168  return o;
169}
170
171smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) {
172  return aubio_beattracking_get_bpm(o->bt);
173}
174
175smpl_t aubio_tempo_get_confidence(aubio_tempo_t *o) {
176  return aubio_beattracking_get_confidence(o->bt);
177}
178
179void del_aubio_tempo (aubio_tempo_t *o)
180{
181  del_aubio_specdesc(o->od);
182  del_aubio_beattracking(o->bt);
183  del_aubio_peakpicker(o->pp);
184  del_aubio_pvoc(o->pv);
185  del_fvec(o->out);
186  del_fvec(o->of);
187  del_cvec(o->fftgrain);
188  del_fvec(o->dfframe);
189  del_fvec(o->onset);
190  AUBIO_FREE(o);
191  return;
192}
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