source: src/tempo.c @ cb0415d

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since cb0415d was cb0415d, checked in by Paul Brossier <piem@piem.org>, 13 years ago

tempo.{c,h}: add aubio_tempo_get_bpm, which for now just calls aubio_beattracking_get_bpm, also update test-tempo.c

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File size: 4.7 KB
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1/*
2   Copyright (C) 2006 Paul Brossier
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2 of the License, or
7   (at your option) any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; if not, write to the Free Software
16   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17
18*/
19
20#include "aubio_priv.h"
21#include "sample.h"
22#include "onsetdetection.h"
23#include "beattracking.h"
24#include "phasevoc.h"
25#include "peakpick.h"
26#include "mathutils.h"
27#include "tempo.h"
28
29/* structure to store object state */
30struct _aubio_tempo_t {
31  aubio_onsetdetection_t * od;   /** onset detection */
32  aubio_pvoc_t * pv;             /** phase vocoder */
33  aubio_pickpeak_t * pp;         /** peak picker */
34  aubio_beattracking_t * bt;     /** beat tracking */
35  cvec_t * fftgrain;             /** spectral frame */
36  fvec_t * of;                   /** onset detection function value */
37  fvec_t * dfframe;              /** peak picked detection function buffer */
38  fvec_t * out;                  /** beat tactus candidates */
39  smpl_t silence;                /** silence parameter */
40  smpl_t threshold;              /** peak picking threshold */
41  sint_t blockpos;               /** current position in dfframe */
42  uint_t winlen;                 /** dfframe bufsize */
43  uint_t step;                   /** dfframe hopsize */ 
44};
45
46/* execute tempo detection function on iput buffer */
47void aubio_tempo(aubio_tempo_t *o, fvec_t * input, fvec_t * tempo)
48{
49  uint_t i;
50  uint_t winlen = o->winlen;
51  uint_t step   = o->step;
52  aubio_pvoc_do (o->pv, input, o->fftgrain);
53  aubio_onsetdetection(o->od, o->fftgrain, o->of);
54  /*if (usedoubled) {
55    aubio_onsetdetection(o2,fftgrain, onset2);
56    onset->data[0][0] *= onset2->data[0][0];
57  }*/
58  /* execute every overlap_size*step */
59  if (o->blockpos == (signed)step -1 ) {
60    /* check dfframe */
61    aubio_beattracking_do(o->bt,o->dfframe,o->out);
62    /* rotate dfframe */
63    for (i = 0 ; i < winlen - step; i++ ) 
64      o->dfframe->data[0][i] = o->dfframe->data[0][i+step];
65    for (i = winlen - step ; i < winlen; i++ ) 
66      o->dfframe->data[0][i] = 0.;
67    o->blockpos = -1;
68  }
69  o->blockpos++;
70  tempo->data[0][1] = aubio_peakpick_pimrt_wt(o->of,o->pp,
71    &(o->dfframe->data[0][winlen - step + o->blockpos]));
72  /* end of second level loop */
73  tempo->data[0][0] = 0; /* reset tactus */
74  i=0;
75  for (i = 1; i < o->out->data[0][0]; i++ ) {
76    /* if current frame is a predicted tactus */
77    if (o->blockpos == o->out->data[0][i]) {
78      /* test for silence */
79      if (aubio_silence_detection(input, o->silence)==1) {
80        tempo->data[0][1] = 0; /* unset onset */
81        tempo->data[0][0] = 0; /* unset tactus */
82      } else {
83        tempo->data[0][0] = 1; /* set tactus */
84      }
85    }
86  }
87}
88
89void aubio_tempo_set_silence(aubio_tempo_t * o, smpl_t silence) {
90  o->silence = silence;
91  return;
92}
93
94void aubio_tempo_set_threshold(aubio_tempo_t * o, smpl_t threshold) {
95  o->threshold = threshold;
96  aubio_peakpicker_set_threshold(o->pp, o->threshold);
97  return;
98}
99
100/* Allocate memory for an tempo detection */
101aubio_tempo_t * new_aubio_tempo (aubio_onsetdetection_type type_onset, 
102    uint_t buf_size, uint_t hop_size, uint_t channels)
103{
104  aubio_tempo_t * o = AUBIO_NEW(aubio_tempo_t);
105  o->winlen = SQR(512)/hop_size;
106  o->step = o->winlen/4;
107  o->blockpos = 0;
108  o->threshold = 0.3;
109  o->silence = -90;
110  o->blockpos = 0;
111  o->dfframe  = new_fvec(o->winlen,channels);
112  o->fftgrain = new_cvec(buf_size, channels);
113  o->out      = new_fvec(o->step,channels);
114  o->pv       = new_aubio_pvoc(buf_size, hop_size, channels);
115  o->pp       = new_aubio_peakpicker(o->threshold);
116  o->od       = new_aubio_onsetdetection(type_onset,buf_size,channels);
117  o->of       = new_fvec(1, channels);
118  o->bt       = new_aubio_beattracking(o->winlen,channels);
119  /*if (usedoubled)    {
120    o2 = new_aubio_onsetdetection(type_onset2,buffer_size,channels);
121    onset2 = new_fvec(1 , channels);
122  }*/
123  return o;
124}
125
126smpl_t aubio_tempo_get_bpm(aubio_tempo_t *o) {
127  return aubio_beattracking_get_bpm(o->bt);
128}
129
130void del_aubio_tempo (aubio_tempo_t *o)
131{
132  del_aubio_onsetdetection(o->od);
133  del_aubio_beattracking(o->bt);
134  del_aubio_peakpicker(o->pp);
135  del_aubio_pvoc(o->pv);
136  del_fvec(o->out);
137  del_fvec(o->of);
138  del_cvec(o->fftgrain);
139  del_fvec(o->dfframe);
140  AUBIO_FREE(o);
141  return;
142}
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