source: src/tempo/tempo.c @ e644757

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since e644757 was e644757, checked in by Paul Brossier <piem@piem.org>, 3 years ago

src/tempo/tempo.c: do not write novelty function in output[1]

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File size: 8.8 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  sint_t delay;                  /** delay to remove to last beat, in samples */
52  uint_t last_tatum;             /** time of latest detected tatum, in samples */
53  uint_t tatum_signature;        /** number of tatum between each beats */
54};
55
56/* execute tempo detection function on iput buffer */
57void aubio_tempo_do(aubio_tempo_t *o, const fvec_t * input, fvec_t * tempo)
58{
59  uint_t i;
60  uint_t winlen = o->winlen;
61  uint_t step   = o->step;
62  fvec_t * thresholded;
63  aubio_pvoc_do (o->pv, input, o->fftgrain);
64  aubio_specdesc_do (o->od, o->fftgrain, o->of);
65  /*if (usedoubled) {
66    aubio_specdesc_do(o2,fftgrain, onset2);
67    onset->data[0] *= onset2->data[0];
68  }*/
69  /* execute every overlap_size*step */
70  if (o->blockpos == (signed)step -1 ) {
71    /* check dfframe */
72    aubio_beattracking_do(o->bt,o->dfframe,o->out);
73    /* rotate dfframe */
74    for (i = 0 ; i < winlen - step; i++ )
75      o->dfframe->data[i] = o->dfframe->data[i+step];
76    for (i = winlen - step ; i < winlen; i++ )
77      o->dfframe->data[i] = 0.;
78    o->blockpos = -1;
79  }
80  o->blockpos++;
81  aubio_peakpicker_do (o->pp, o->of, o->onset);
82  // store onset detection function in second sample of vector
83  //tempo->data[1] = o->onset->data[0];
84  thresholded = aubio_peakpicker_get_thresholded_input(o->pp);
85  o->dfframe->data[winlen - step + o->blockpos] = thresholded->data[0];
86  /* end of second level loop */
87  tempo->data[0] = 0; /* reset tactus */
88  //i=0;
89  for (i = 1; i < o->out->data[0]; i++ ) {
90    /* if current frame is a predicted tactus */
91    if (o->blockpos == FLOOR(o->out->data[i])) {
92      tempo->data[0] = o->out->data[i] - FLOOR(o->out->data[i]); /* set tactus */
93      /* test for silence */
94      if (aubio_silence_detection(input, o->silence)==1) {
95        tempo->data[0] = 0; // unset beat if silent
96      }
97      o->last_beat = o->total_frames + (uint_t)ROUND(tempo->data[0] * o->hop_size);
98      o->last_tatum = o->last_beat;
99    }
100  }
101  o->total_frames += o->hop_size;
102  return;
103}
104
105uint_t aubio_tempo_get_last (aubio_tempo_t *o)
106{
107  return o->last_beat + o->delay;
108}
109
110smpl_t aubio_tempo_get_last_s (aubio_tempo_t *o)
111{
112  return aubio_tempo_get_last (o) / (smpl_t) (o->samplerate);
113}
114
115smpl_t aubio_tempo_get_last_ms (aubio_tempo_t *o)
116{
117  return aubio_tempo_get_last_s (o) * 1000.;
118}
119
120uint_t aubio_tempo_set_delay(aubio_tempo_t * o, sint_t delay) {
121  o->delay = delay;
122  return AUBIO_OK;
123}
124
125uint_t aubio_tempo_set_delay_s(aubio_tempo_t * o, smpl_t delay) {
126  o->delay = delay * o->samplerate;
127  return AUBIO_OK;
128}
129
130uint_t aubio_tempo_set_delay_ms(aubio_tempo_t * o, smpl_t delay) {
131  o->delay = 1000. * delay * o->samplerate;
132  return AUBIO_OK;
133}
134
135uint_t aubio_tempo_get_delay(aubio_tempo_t * o) {
136  return o->delay;
137}
138
139smpl_t aubio_tempo_get_delay_s(aubio_tempo_t * o) {
140  return o->delay / (smpl_t)(o->samplerate);
141}
142
143smpl_t aubio_tempo_get_delay_ms(aubio_tempo_t * o) {
144  return o->delay / (smpl_t)(o->samplerate) / 1000.;
145}
146
147uint_t aubio_tempo_set_silence(aubio_tempo_t * o, smpl_t silence) {
148  o->silence = silence;
149  return AUBIO_OK;
150}
151
152smpl_t aubio_tempo_get_silence(aubio_tempo_t * o) {
153  return o->silence;
154}
155
156uint_t aubio_tempo_set_threshold(aubio_tempo_t * o, smpl_t threshold) {
157  o->threshold = threshold;
158  aubio_peakpicker_set_threshold(o->pp, o->threshold);
159  return AUBIO_OK;
160}
161
162smpl_t aubio_tempo_get_threshold(aubio_tempo_t * o) {
163  return o->threshold;
164}
165
166/* Allocate memory for an tempo detection */
167aubio_tempo_t * new_aubio_tempo (const char_t * tempo_mode,
168    uint_t buf_size, uint_t hop_size, uint_t samplerate)
169{
170  aubio_tempo_t * o = AUBIO_NEW(aubio_tempo_t);
171  char_t specdesc_func[20];
172  o->samplerate = samplerate;
173  // check parameters are valid
174  if ((sint_t)hop_size < 1) {
175    AUBIO_ERR("tempo: got hop size %d, but can not be < 1\n", hop_size);
176    goto beach;
177  } else if ((sint_t)buf_size < 2) {
178    AUBIO_ERR("tempo: got window size %d, but can not be < 2\n", buf_size);
179    goto beach;
180  } else if (buf_size < hop_size) {
181    AUBIO_ERR("tempo: hop size (%d) is larger than window size (%d)\n", buf_size, hop_size);
182    goto beach;
183  } else if ((sint_t)samplerate < 1) {
184    AUBIO_ERR("tempo: samplerate (%d) can not be < 1\n", samplerate);
185    goto beach;
186  }
187
188  /* length of observations, worth about 6 seconds */
189  o->winlen = aubio_next_power_of_two(5.8 * samplerate / hop_size);
190  if (o->winlen < 4) o->winlen = 4;
191  o->step = o->winlen/4;
192  o->blockpos = 0;
193  o->threshold = 0.3;
194  o->silence = -90.;
195  o->total_frames = 0;
196  o->last_beat = 0;
197  o->delay = 0;
198  o->hop_size = hop_size;
199  o->dfframe  = new_fvec(o->winlen);
200  o->fftgrain = new_cvec(buf_size);
201  o->out      = new_fvec(o->step);
202  o->pv       = new_aubio_pvoc(buf_size, hop_size);
203  o->pp       = new_aubio_peakpicker();
204  aubio_peakpicker_set_threshold (o->pp, o->threshold);
205  if ( strcmp(tempo_mode, "default") == 0 ) {
206    strcpy(specdesc_func, "specflux");
207  } else {
208    strcpy(specdesc_func, tempo_mode);
209  }
210  o->od       = new_aubio_specdesc(specdesc_func,buf_size);
211  o->of       = new_fvec(1);
212  o->bt       = new_aubio_beattracking(o->winlen, o->hop_size, o->samplerate);
213  o->onset    = new_fvec(1);
214  /*if (usedoubled)    {
215    o2 = new_aubio_specdesc(type_onset2,buffer_size);
216    onset2 = new_fvec(1);
217  }*/
218  o->last_tatum = 0;
219  o->tatum_signature = 4;
220  return o;
221
222beach:
223  AUBIO_FREE(o);
224  return NULL;
225}
226
227smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) {
228  return aubio_beattracking_get_bpm(o->bt);
229}
230
231smpl_t aubio_tempo_get_period (aubio_tempo_t *o)
232{
233  return aubio_beattracking_get_period (o->bt);
234}
235
236smpl_t aubio_tempo_get_period_s (aubio_tempo_t *o)
237{
238  return aubio_beattracking_get_period_s (o->bt);
239}
240
241smpl_t aubio_tempo_get_confidence(aubio_tempo_t *o) {
242  return aubio_beattracking_get_confidence(o->bt);
243}
244
245uint_t aubio_tempo_was_tatum (aubio_tempo_t *o)
246{
247  uint_t last_tatum_distance = o->total_frames - o->last_tatum;
248  smpl_t beat_period = aubio_tempo_get_period(o);
249  smpl_t tatum_period = beat_period / o->tatum_signature;
250  if (last_tatum_distance < o->hop_size) {
251    o->last_tatum = o->last_beat;
252    return 2;
253  }
254  else if (last_tatum_distance > tatum_period) {
255    if ( last_tatum_distance + o->hop_size > beat_period ) {
256      // next beat is too close, pass
257      return 0;
258    }
259    o->last_tatum = o->total_frames;
260    return 1;
261  }
262  return 0;
263}
264
265smpl_t aubio_tempo_get_last_tatum (aubio_tempo_t *o) {
266  return (smpl_t)o->last_tatum - o->delay;
267}
268
269uint_t aubio_tempo_set_tatum_signature (aubio_tempo_t *o, uint_t signature) {
270  if (signature < 1 || signature > 64) {
271    return AUBIO_FAIL;
272  } else {
273    o->tatum_signature = signature;
274    return AUBIO_OK;
275  }
276}
277
278void del_aubio_tempo (aubio_tempo_t *o)
279{
280  del_aubio_specdesc(o->od);
281  del_aubio_beattracking(o->bt);
282  del_aubio_peakpicker(o->pp);
283  del_aubio_pvoc(o->pv);
284  del_fvec(o->out);
285  del_fvec(o->of);
286  del_cvec(o->fftgrain);
287  del_fvec(o->dfframe);
288  del_fvec(o->onset);
289  AUBIO_FREE(o);
290  return;
291}
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