source: src/tempo/tempo.c @ 810b3b6

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 810b3b6 was 810b3b6, checked in by Paul Brossier <piem@piem.org>, 5 years ago

src/tempo/tempo.c: comment out unused assign

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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// 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      if (aubio_silence_detection(input, o->silence)==1) {
113        tempo->data[0] = 0; // unset beat if silent
114      }
115      o->last_beat = o->total_frames + (uint_t)ROUND(tempo->data[0] * o->hop_size);
116    }
117  }
118  o->total_frames += o->hop_size;
119  return;
120}
121
122uint_t aubio_tempo_get_last (aubio_tempo_t *o)
123{
124  return o->last_beat - o->delay;
125}
126
127smpl_t aubio_tempo_get_last_s (aubio_tempo_t *o)
128{
129  return aubio_tempo_get_last (o) / (smpl_t) (o->samplerate);
130}
131
132smpl_t aubio_tempo_get_last_ms (aubio_tempo_t *o)
133{
134  return aubio_tempo_get_last_s (o) * 1000.;
135}
136
137uint_t aubio_tempo_set_delay(aubio_tempo_t * o, uint_t delay) {
138  o->delay = delay;
139  return AUBIO_OK;
140}
141
142uint_t aubio_tempo_get_delay(aubio_tempo_t * o) {
143  return o->delay;
144}
145
146uint_t aubio_tempo_set_silence(aubio_tempo_t * o, smpl_t silence) {
147  o->silence = silence;
148  return AUBIO_OK;
149}
150
151smpl_t aubio_tempo_get_silence(aubio_tempo_t * o) {
152  return o->silence;
153}
154
155uint_t aubio_tempo_set_threshold(aubio_tempo_t * o, smpl_t threshold) {
156  o->threshold = threshold;
157  aubio_peakpicker_set_threshold(o->pp, o->threshold);
158  return AUBIO_OK;
159}
160
161smpl_t aubio_tempo_get_threshold(aubio_tempo_t * o) {
162  return o->threshold;
163}
164
165/* Allocate memory for an tempo detection */
166aubio_tempo_t * new_aubio_tempo (char_t * tempo_mode,
167    uint_t buf_size, uint_t hop_size, uint_t samplerate)
168{
169  aubio_tempo_t * o = AUBIO_NEW(aubio_tempo_t);
170  char_t specdesc_func[20];
171  o->samplerate = samplerate;
172  // check parameters are valid
173  if ((sint_t)hop_size < 1) {
174    AUBIO_ERR("tempo: got hop size %d, but can not be < 1\n", hop_size);
175    goto beach;
176  } else if ((sint_t)buf_size < 1) {
177    AUBIO_ERR("tempo: got window size %d, but can not be < 1\n", buf_size);
178    goto beach;
179  } else if (buf_size < hop_size) {
180    AUBIO_ERR("tempo: hop size (%d) is larger than window size (%d)\n", buf_size, hop_size);
181    goto beach;
182  } else if ((sint_t)samplerate < 1) {
183    AUBIO_ERR("tempo: samplerate (%d) can not be < 1\n", samplerate);
184    goto beach;
185  }
186
187  /* length of observations, worth about 6 seconds */
188  o->winlen = aubio_next_power_of_two(5.8 * samplerate / hop_size);
189  if (o->winlen < 4) o->winlen = 4;
190  o->step = o->winlen/4;
191  o->blockpos = 0;
192  o->threshold = 0.3;
193  o->silence = -90.;
194  o->total_frames = 0;
195  o->last_beat = 0;
196  o->delay = 0;
197  o->hop_size = hop_size;
198  o->dfframe  = new_fvec(o->winlen);
199  o->fftgrain = new_cvec(buf_size);
200  o->out      = new_fvec(o->step);
201  o->pv       = new_aubio_pvoc(buf_size, hop_size);
202  o->pp       = new_aubio_peakpicker();
203  aubio_peakpicker_set_threshold (o->pp, o->threshold);
204  if ( strcmp(tempo_mode, "default") == 0 ) {
205    strcpy(specdesc_func, "specflux");
206  } else {
207    strcpy(specdesc_func, tempo_mode);
208  }
209  o->od       = new_aubio_specdesc(specdesc_func,buf_size);
210  o->of       = new_fvec(1);
211  o->bt       = new_aubio_beattracking(o->winlen, o->hop_size, o->samplerate);
212  o->onset    = new_fvec(1);
213  /*if (usedoubled)    {
214    o2 = new_aubio_specdesc(type_onset2,buffer_size);
215    onset2 = new_fvec(1);
216  }*/
217  return o;
218
219beach:
220  AUBIO_FREE(o);
221  return NULL;
222}
223
224smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) {
225  return aubio_beattracking_get_bpm(o->bt);
226}
227
228smpl_t aubio_tempo_get_period (aubio_tempo_t *o)
229{
230  return aubio_beattracking_get_period (o->bt);
231}
232
233smpl_t aubio_tempo_get_period_s (aubio_tempo_t *o)
234{
235  return aubio_beattracking_get_period_s (o->bt);
236}
237
238smpl_t aubio_tempo_get_confidence(aubio_tempo_t *o) {
239  return aubio_beattracking_get_confidence(o->bt);
240}
241
242void del_aubio_tempo (aubio_tempo_t *o)
243{
244  del_aubio_specdesc(o->od);
245  del_aubio_beattracking(o->bt);
246  del_aubio_peakpicker(o->pp);
247  del_aubio_pvoc(o->pv);
248  del_fvec(o->out);
249  del_fvec(o->of);
250  del_cvec(o->fftgrain);
251  del_fvec(o->dfframe);
252  del_fvec(o->onset);
253  AUBIO_FREE(o);
254  return;
255}
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