source: src/onset/peakpicker.c @ 3e1c482

feature/autosinkfeature/constantqfeature/pitchshiftfeature/timestretch
Last change on this file since 3e1c482 was e149aa9, checked in by Paul Brossier <piem@piem.org>, 4 years ago

src/onset/peakpicker.c: simplify using fvec_foo

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File size: 5.8 KB
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1/*
2  Copyright (C) 2003-2009 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 "mathutils.h"
24#include "lvec.h"
25#include "temporal/filter.h"
26#include "temporal/biquad.h"
27#include "onset/peakpicker.h"
28
29/** function pointer to thresholding function */
30typedef smpl_t (*aubio_thresholdfn_t)(fvec_t *input);
31/** function pointer to peak-picking function */
32typedef uint_t (*aubio_pickerfn_t)(fvec_t *input, uint_t pos);
33
34/** set peak picker thresholding function */
35uint_t aubio_peakpicker_set_thresholdfn(aubio_peakpicker_t * p, aubio_thresholdfn_t thresholdfn);
36/** get peak picker thresholding function */
37aubio_thresholdfn_t aubio_peakpicker_get_thresholdfn(aubio_peakpicker_t * p);
38
39/* peak picking parameters, default values in brackets
40 *
41 *     [<----post----|--pre-->]
42 *  .................|.............
43 *  time->           ^now
44 */
45struct _aubio_peakpicker_t
46{
47        /** thresh: offset threshold [0.033 or 0.01] */
48  smpl_t threshold;
49        /** win_post: median filter window length (causal part) [8] */
50  uint_t win_post;
51        /** pre: median filter window (anti-causal part) [post-1] */
52  uint_t win_pre;
53        /** threshfn: name or handle of fn for computing adaptive threshold [median]  */
54  aubio_thresholdfn_t thresholdfn;
55        /** picker: name or handle of fn for picking event times [peakpick] */
56  aubio_pickerfn_t pickerfn;
57
58        /** biquad lowpass filter */
59  aubio_filter_t *biquad;
60        /** original onsets */
61  fvec_t *onset_keep;
62        /** modified onsets */
63  fvec_t *onset_proc;
64        /** peak picked window [3] */
65  fvec_t *onset_peek;
66        /** thresholded function */
67  fvec_t *thresholded;
68        /** scratch pad for biquad and median */
69  fvec_t *scratch;
70
71        /** \bug should be used to calculate filter coefficients */
72  /* cutoff: low-pass filter cutoff [0.34, 1] */
73  /* smpl_t cutoff; */
74
75  /* not used anymore */
76  /* time precision [512/44100  winlength/samplerate, fs/buffer_size */
77  /* smpl_t tau; */
78  /* alpha: normalisation exponent [9] */
79  /* smpl_t alpha; */
80};
81
82
83/** modified version for real time, moving mean adaptive threshold this method
84 * is slightly more permissive than the offline one, and yelds to an increase
85 * of false positives. best  */
86void
87aubio_peakpicker_do (aubio_peakpicker_t * p, fvec_t * onset, fvec_t * out)
88{
89  fvec_t *onset_keep = p->onset_keep;
90  fvec_t *onset_proc = p->onset_proc;
91  fvec_t *onset_peek = p->onset_peek;
92  fvec_t *thresholded = p->thresholded;
93  fvec_t *scratch = p->scratch;
94  smpl_t mean = 0., median = 0.;
95  uint_t j = 0;
96
97  /* push new novelty to the end */
98  fvec_push(onset_keep, onset->data[0]);
99  /* store a copy */
100  fvec_copy(onset_keep, onset_proc);
101
102  /* filter this copy */
103  aubio_filter_do_filtfilt (p->biquad, onset_proc, scratch);
104
105  /* calculate mean and median for onset_proc */
106  mean = fvec_mean (onset_proc);
107
108  /* copy to scratch and compute its median */
109  fvec_copy(onset_proc, scratch);
110  median = p->thresholdfn (scratch);
111
112  /* shift peek array */
113  for (j = 0; j < 3 - 1; j++)
114    onset_peek->data[j] = onset_peek->data[j + 1];
115  /* calculate new tresholded value */
116  thresholded->data[0] =
117      onset_proc->data[p->win_post] - median - mean * p->threshold;
118  onset_peek->data[2] = thresholded->data[0];
119  out->data[0] = (p->pickerfn) (onset_peek, 1);
120  if (out->data[0]) {
121    out->data[0] = fvec_quadratic_peak_pos (onset_peek, 1);
122  }
123}
124
125/** this method returns the current value in the pick peaking buffer
126 * after smoothing
127 */
128fvec_t *
129aubio_peakpicker_get_thresholded_input (aubio_peakpicker_t * p)
130{
131  return p->thresholded;
132}
133
134uint_t
135aubio_peakpicker_set_threshold (aubio_peakpicker_t * p, smpl_t threshold)
136{
137  p->threshold = threshold;
138  return AUBIO_OK;
139}
140
141smpl_t
142aubio_peakpicker_get_threshold (aubio_peakpicker_t * p)
143{
144  return p->threshold;
145}
146
147uint_t
148aubio_peakpicker_set_thresholdfn (aubio_peakpicker_t * p,
149    aubio_thresholdfn_t thresholdfn)
150{
151  p->thresholdfn = thresholdfn;
152  return AUBIO_OK;
153}
154
155aubio_thresholdfn_t
156aubio_peakpicker_get_thresholdfn (aubio_peakpicker_t * p)
157{
158  return (aubio_thresholdfn_t) (p->thresholdfn);
159}
160
161aubio_peakpicker_t *
162new_aubio_peakpicker (void)
163{
164  aubio_peakpicker_t *t = AUBIO_NEW (aubio_peakpicker_t);
165  t->threshold = 0.1;           /* 0.0668; 0.33; 0.082; 0.033; */
166  t->win_post = 5;
167  t->win_pre = 1;
168
169  t->thresholdfn = (aubio_thresholdfn_t) (fvec_median); /* (fvec_mean); */
170  t->pickerfn = (aubio_pickerfn_t) (fvec_peakpick);
171
172  t->scratch = new_fvec (t->win_post + t->win_pre + 1);
173  t->onset_keep = new_fvec (t->win_post + t->win_pre + 1);
174  t->onset_proc = new_fvec (t->win_post + t->win_pre + 1);
175  t->onset_peek = new_fvec (3);
176  t->thresholded = new_fvec (1);
177
178  /* cutoff: low-pass filter with cutoff reduced frequency at 0.34
179     generated with octave butter function: [b,a] = butter(2, 0.34);
180   */
181  t->biquad = new_aubio_filter_biquad (0.15998789, 0.31997577, 0.15998789,
182      // FIXME: broken since c9e20ca, revert for now
183      //-0.59488894, 0.23484048);
184      0.23484048, 0);
185
186  return t;
187}
188
189void
190del_aubio_peakpicker (aubio_peakpicker_t * p)
191{
192  del_aubio_filter (p->biquad);
193  del_fvec (p->onset_keep);
194  del_fvec (p->onset_proc);
195  del_fvec (p->onset_peek);
196  del_fvec (p->thresholded);
197  del_fvec (p->scratch);
198  AUBIO_FREE (p);
199}
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