source: src/tempo/tempo.c @ deb1fd4

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since deb1fd4 was deb1fd4, checked in by Paul Brossier <piem@piem.org>, 5 years ago

src/tempo/tempo.h: add aubio_tempo_get_silence and aubio_tempo_get_threshold

  • Property mode set to 100644
File size: 7.4 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// TODO implement get/set_delay
32
33/** set current delay
34
35  \param o beat tracking object
36
37  \return current delay, in samples
38
39 */
40uint_t aubio_tempo_get_delay(aubio_tempo_t * o);
41
42/** set current delay
43
44  \param o beat tracking object
45  \param delay delay to set tempo to, in samples
46
47  \return `0` if successful, non-zero otherwise
48
49 */
50uint_t aubio_tempo_set_delay(aubio_tempo_t * o, uint_t delay);
51
52/* structure to store object state */
53struct _aubio_tempo_t {
54  aubio_specdesc_t * od;   /** onset detection */
55  aubio_pvoc_t * pv;             /** phase vocoder */
56  aubio_peakpicker_t * pp;       /** peak picker */
57  aubio_beattracking_t * bt;     /** beat tracking */
58  cvec_t * fftgrain;             /** spectral frame */
59  fvec_t * of;                   /** onset detection function value */
60  fvec_t * dfframe;              /** peak picked detection function buffer */
61  fvec_t * out;                  /** beat tactus candidates */
62  fvec_t * onset;                /** onset results */
63  smpl_t silence;                /** silence parameter */
64  smpl_t threshold;              /** peak picking threshold */
65  sint_t blockpos;               /** current position in dfframe */
66  uint_t winlen;                 /** dfframe bufsize */
67  uint_t step;                   /** dfframe hopsize */ 
68  uint_t samplerate;             /** sampling rate of the signal */ 
69  uint_t hop_size;               /** get hop_size */
70  uint_t total_frames;           /** total frames since beginning */
71  uint_t last_beat;              /** time of latest detected beat, in samples */
72  uint_t delay;                  /** delay to remove to last beat, in samples */
73};
74
75/* execute tempo detection function on iput buffer */
76void aubio_tempo_do(aubio_tempo_t *o, fvec_t * input, fvec_t * tempo)
77{
78  uint_t i;
79  uint_t winlen = o->winlen;
80  uint_t step   = o->step;
81  fvec_t * thresholded;
82  aubio_pvoc_do (o->pv, input, o->fftgrain);
83  aubio_specdesc_do (o->od, o->fftgrain, o->of);
84  /*if (usedoubled) {
85    aubio_specdesc_do(o2,fftgrain, onset2);
86    onset->data[0] *= onset2->data[0];
87  }*/
88  /* execute every overlap_size*step */
89  if (o->blockpos == (signed)step -1 ) {
90    /* check dfframe */
91    aubio_beattracking_do(o->bt,o->dfframe,o->out);
92    /* rotate dfframe */
93    for (i = 0 ; i < winlen - step; i++ ) 
94      o->dfframe->data[i] = o->dfframe->data[i+step];
95    for (i = winlen - step ; i < winlen; i++ ) 
96      o->dfframe->data[i] = 0.;
97    o->blockpos = -1;
98  }
99  o->blockpos++;
100  aubio_peakpicker_do (o->pp, o->of, o->onset);
101  tempo->data[1] = o->onset->data[0];
102  thresholded = aubio_peakpicker_get_thresholded_input(o->pp);
103  o->dfframe->data[winlen - step + o->blockpos] = thresholded->data[0];
104  /* end of second level loop */
105  tempo->data[0] = 0; /* reset tactus */
106  i=0;
107  for (i = 1; i < o->out->data[0]; i++ ) {
108    /* if current frame is a predicted tactus */
109    if (o->blockpos == FLOOR(o->out->data[i])) {
110      tempo->data[0] = o->out->data[i] - FLOOR(o->out->data[i]); /* set tactus */
111      /* test for silence */
112      /*
113      if (aubio_silence_detection(input, o->silence)==1) {
114        tempo->data[0] = 0; // unset beat if silent
115      }
116      */
117      o->last_beat = o->total_frames + (uint_t)ROUND(tempo->data[0] * o->hop_size);
118    }
119  }
120  o->total_frames += o->hop_size;
121  return;
122}
123
124uint_t aubio_tempo_get_last (aubio_tempo_t *o)
125{
126  return o->last_beat - o->delay;
127}
128
129smpl_t aubio_tempo_get_last_s (aubio_tempo_t *o)
130{
131  return aubio_tempo_get_last (o) / (smpl_t) (o->samplerate);
132}
133
134smpl_t aubio_tempo_get_last_ms (aubio_tempo_t *o)
135{
136  return aubio_tempo_get_last_s (o) * 1000.;
137}
138
139uint_t aubio_tempo_set_delay(aubio_tempo_t * o, uint_t delay) {
140  o->delay = delay;
141  return AUBIO_OK;
142}
143
144uint_t aubio_tempo_get_delay(aubio_tempo_t * o) {
145  return o->delay;
146}
147
148uint_t aubio_tempo_set_silence(aubio_tempo_t * o, smpl_t silence) {
149  o->silence = silence;
150  return AUBIO_OK;
151}
152
153smpl_t aubio_tempo_get_silence(aubio_tempo_t * o) {
154  return o->silence;
155}
156
157uint_t aubio_tempo_set_threshold(aubio_tempo_t * o, smpl_t threshold) {
158  o->threshold = threshold;
159  aubio_peakpicker_set_threshold(o->pp, o->threshold);
160  return AUBIO_OK;
161}
162
163smpl_t aubio_tempo_get_threshold(aubio_tempo_t * o) {
164  return o->threshold;
165}
166
167/* Allocate memory for an tempo detection */
168aubio_tempo_t * new_aubio_tempo (char_t * tempo_mode,
169    uint_t buf_size, uint_t hop_size, uint_t samplerate)
170{
171  aubio_tempo_t * o = AUBIO_NEW(aubio_tempo_t);
172  char_t specdesc_func[20];
173  o->samplerate = samplerate;
174  // check parameters are valid
175  if ((sint_t)hop_size < 1) {
176    AUBIO_ERR("tempo: got hop size %d, but can not be < 1\n", hop_size);
177    goto beach;
178  } else if ((sint_t)buf_size < 1) {
179    AUBIO_ERR("tempo: got window size %d, but can not be < 1\n", buf_size);
180    goto beach;
181  } else if (buf_size < hop_size) {
182    AUBIO_ERR("tempo: hop size (%d) is larger than window size (%d)\n", buf_size, hop_size);
183    goto beach;
184  } else if ((sint_t)samplerate < 1) {
185    AUBIO_ERR("tempo: samplerate (%d) can not be < 1\n", samplerate);
186    goto beach;
187  }
188
189  /* length of observations, worth about 6 seconds */
190  o->winlen = aubio_next_power_of_two(5.8 * samplerate / hop_size);
191  if (o->winlen < 4) o->winlen = 4;
192  o->step = o->winlen/4;
193  o->blockpos = 0;
194  o->threshold = 0.3;
195  o->silence = -90.;
196  o->total_frames = 0;
197  o->last_beat = 0;
198  o->delay = 0;
199  o->hop_size = hop_size;
200  o->dfframe  = new_fvec(o->winlen);
201  o->fftgrain = new_cvec(buf_size);
202  o->out      = new_fvec(o->step);
203  o->pv       = new_aubio_pvoc(buf_size, hop_size);
204  o->pp       = new_aubio_peakpicker();
205  aubio_peakpicker_set_threshold (o->pp, o->threshold);
206  if ( strcmp(tempo_mode, "default") == 0 ) {
207    strcpy(specdesc_func, "specflux");
208  } else {
209    strcpy(specdesc_func, tempo_mode);
210  }
211  o->od       = new_aubio_specdesc(specdesc_func,buf_size);
212  o->of       = new_fvec(1);
213  o->bt       = new_aubio_beattracking(o->winlen, o->hop_size, o->samplerate);
214  o->onset    = new_fvec(1);
215  /*if (usedoubled)    {
216    o2 = new_aubio_specdesc(type_onset2,buffer_size);
217    onset2 = new_fvec(1);
218  }*/
219  return o;
220
221beach:
222  AUBIO_FREE(o);
223  return NULL;
224}
225
226smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) {
227  return aubio_beattracking_get_bpm(o->bt);
228}
229
230smpl_t aubio_tempo_get_confidence(aubio_tempo_t *o) {
231  return aubio_beattracking_get_confidence(o->bt);
232}
233
234void del_aubio_tempo (aubio_tempo_t *o)
235{
236  del_aubio_specdesc(o->od);
237  del_aubio_beattracking(o->bt);
238  del_aubio_peakpicker(o->pp);
239  del_aubio_pvoc(o->pv);
240  del_fvec(o->out);
241  del_fvec(o->of);
242  del_cvec(o->fftgrain);
243  del_fvec(o->dfframe);
244  del_fvec(o->onset);
245  AUBIO_FREE(o);
246  return;
247}
Note: See TracBrowser for help on using the repository browser.