source: src/tempo/tempo.c @ e6a78ea

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since e6a78ea was e6a78ea, checked in by Paul Brossier <piem@piem.org>, 10 years ago

src: update all headers to GPLv3

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File size: 5.3 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 "onset/onsetdetection.h"
25#include "tempo/beattracking.h"
26#include "spectral/phasevoc.h"
27#include "onset/peakpick.h"
28#include "mathutils.h"
29#include "tempo/tempo.h"
30
31/* structure to store object state */
32struct _aubio_tempo_t {
33  aubio_onsetdetection_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  fvec_t * peek;                 /** thresholded onset function */
43  smpl_t silence;                /** silence parameter */
44  smpl_t threshold;              /** peak picking threshold */
45  sint_t blockpos;               /** current position in dfframe */
46  uint_t winlen;                 /** dfframe bufsize */
47  uint_t step;                   /** dfframe hopsize */ 
48  uint_t samplerate;             /** sampling rate of the signal */ 
49};
50
51/* execute tempo detection function on iput buffer */
52void aubio_tempo_do(aubio_tempo_t *o, fvec_t * input, fvec_t * tempo)
53{
54  uint_t i;
55  uint_t winlen = o->winlen;
56  uint_t step   = o->step;
57  aubio_pvoc_do (o->pv, input, o->fftgrain);
58  aubio_onsetdetection_do (o->od, o->fftgrain, o->of);
59  /*if (usedoubled) {
60    aubio_onsetdetection_do(o2,fftgrain, onset2);
61    onset->data[0][0] *= onset2->data[0][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[0][i] = o->dfframe->data[0][i+step];
70    for (i = winlen - step ; i < winlen; i++ ) 
71      o->dfframe->data[0][i] = 0.;
72    o->blockpos = -1;
73  }
74  o->blockpos++;
75  aubio_peakpicker_do (o->pp, o->of, o->onset);
76  tempo->data[0][1] = o->onset->data[0][0];
77  o->dfframe->data[0][winlen - step + o->blockpos] = 
78    aubio_peakpicker_get_thresholded_input(o->pp);
79  /* end of second level loop */
80  tempo->data[0][0] = 0; /* reset tactus */
81  i=0;
82  for (i = 1; i < o->out->data[0][0]; i++ ) {
83    /* if current frame is a predicted tactus */
84    if (o->blockpos == FLOOR(o->out->data[0][i])) {
85      tempo->data[0][0] = 1. + o->out->data[0][i] - FLOOR(o->out->data[0][i]); /* set tactus */
86      /* test for silence */
87      if (aubio_silence_detection(input, o->silence)==1) {
88        tempo->data[0][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 channels, 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,channels);
118  o->fftgrain = new_cvec(buf_size, channels);
119  o->out      = new_fvec(o->step,channels);
120  o->pv       = new_aubio_pvoc(buf_size, hop_size, channels);
121  o->pp       = new_aubio_peakpicker(channels);
122  aubio_peakpicker_set_threshold (o->pp, o->threshold);
123  o->od       = new_aubio_onsetdetection(onset_mode,buf_size,channels);
124  o->of       = new_fvec(1, channels);
125  o->bt       = new_aubio_beattracking(o->winlen,channels);
126  o->onset    = new_fvec(1, channels);
127  o->peek     = new_fvec(3, channels);
128  /*if (usedoubled)    {
129    o2 = new_aubio_onsetdetection(type_onset2,buffer_size,channels);
130    onset2 = new_fvec(1 , channels);
131  }*/
132  return o;
133}
134
135smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) {
136  return aubio_beattracking_get_bpm(o->bt);
137}
138
139smpl_t aubio_tempo_get_confidence(aubio_tempo_t *o) {
140  return aubio_beattracking_get_confidence(o->bt);
141}
142
143void del_aubio_tempo (aubio_tempo_t *o)
144{
145  del_aubio_onsetdetection(o->od);
146  del_aubio_beattracking(o->bt);
147  del_aubio_peakpicker(o->pp);
148  del_aubio_pvoc(o->pv);
149  del_fvec(o->out);
150  del_fvec(o->of);
151  del_cvec(o->fftgrain);
152  del_fvec(o->dfframe);
153  del_fvec(o->onset);
154  del_fvec(o->peek);
155  AUBIO_FREE(o);
156  return;
157}
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