source: src/onset/peakpick.c @ 422edfb

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since 422edfb was 422edfb, checked in by Paul Brossier <piem@piem.org>, 14 years ago

src/onset/peakpick.h: clean up peakpicker object

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File size: 5.5 KB
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1/*
2   Copyright (C) 2003 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 "fvec.h"
22#include "mathutils.h"
23#include "temporal/biquad.h"
24#include "onset/peakpick.h"
25
26/* peak picking parameters, default values in brackets
27 *
28 *         [<----post----|--pre-->]
29 *      .................|.............
30 *      time->           ^now
31 */
32struct _aubio_pickpeak_t {
33        /** thresh: offset threshold [0.033 or 0.01] */
34        smpl_t threshold;       
35        /** win_post: median filter window length (causal part) [8] */
36        uint_t  win_post;                       
37        /** pre: median filter window (anti-causal part) [post-1] */
38        uint_t  win_pre;                               
39        /** threshfn: name or handle of fn for computing adaptive threshold [median]  */
40        aubio_thresholdfn_t thresholdfn;
41        /** picker: name or handle of fn for picking event times [peakpick] */
42        aubio_pickerfn_t pickerfn;
43
44        /** biquad lowpass filter */
45        aubio_biquad_t * biquad;
46        /** original onsets */
47        fvec_t * onset_keep;
48        /** modified onsets */
49        fvec_t * onset_proc;
50        /** peak picked window [3] */
51        fvec_t * onset_peek;
52        /** scratch pad for biquad and median */
53        fvec_t * scratch;
54
55        /** \bug should be used to calculate filter coefficients */
56        /* cutoff: low-pass filter cutoff [0.34, 1] */
57        /* smpl_t cutoff; */
58
59        /* not used anymore */
60        /* time precision [512/44100  winlength/samplerate, fs/buffer_size */
61        /* smpl_t tau; */
62        /* alpha: normalisation exponent [9] */
63        /* smpl_t alpha; */
64};
65
66
67/** modified version for real time, moving mean adaptive threshold this method
68 * is slightly more permissive than the offline one, and yelds to an increase
69 * of false positives. best  */
70smpl_t aubio_peakpicker_do(aubio_pickpeak_t * p, fvec_t * onset) {
71        fvec_t * onset_keep = (fvec_t *)p->onset_keep;
72        fvec_t * onset_proc = (fvec_t *)p->onset_proc;
73        fvec_t * onset_peek = (fvec_t *)p->onset_peek;
74        fvec_t * scratch    = (fvec_t *)p->scratch;
75        smpl_t mean = 0., median = 0.;
76  smpl_t isonset = 0.;
77        uint_t length = p->win_post + p->win_pre + 1;
78        uint_t i = 0, j;
79
80        /* store onset in onset_keep */
81        /* shift all elements but last, then write last */
82        /* for (i=0;i<channels;i++) { */
83        for (j=0;j<length-1;j++) {
84                onset_keep->data[i][j] = onset_keep->data[i][j+1];
85                onset_proc->data[i][j] = onset_keep->data[i][j];
86        }
87        onset_keep->data[i][length-1] = onset->data[i][0];
88        onset_proc->data[i][length-1] = onset->data[i][0];
89        /* } */
90
91        /* filter onset_proc */
92        /** \bug filtfilt calculated post+pre times, should be only once !? */
93        aubio_biquad_do_filtfilt(p->biquad,onset_proc,scratch);
94
95        /* calculate mean and median for onset_proc */
96        /* for (i=0;i<onset_proc->channels;i++) { */
97        mean = fvec_mean(onset_proc);
98        /* copy to scratch */
99        for (j = 0; j < length; j++)
100                scratch->data[i][j] = onset_proc->data[i][j];
101        median = p->thresholdfn(scratch);
102        /* } */
103
104        /* for (i=0;i<onset->channels;i++) { */
105        /* shift peek array */
106        for (j=0;j<3-1;j++) 
107                onset_peek->data[i][j] = onset_peek->data[i][j+1];
108        /* calculate new peek value */
109        onset_peek->data[i][2] = 
110                onset_proc->data[i][p->win_post] - median - mean * p->threshold;
111        /* } */
112        //AUBIO_DBG("%f\n", onset_peek->data[0][2]);
113  isonset = (p->pickerfn)(onset_peek,1);
114  if (isonset) { //(isonset) {
115    isonset = fvec_quadint(onset_peek, 1, 1);
116  }
117        return isonset;
118}
119
120/** this method returns the current value in the pick peaking buffer
121 * after smoothing
122 */
123smpl_t aubio_peakpicker_get_thresholded_input(aubio_pickpeak_t * p) 
124{
125        return p->onset_peek->data[0][1];
126}
127
128/** function added by Miguel Ramirez to return the onset detection amplitude in peakval */
129void aubio_peakpicker_set_threshold(aubio_pickpeak_t * p, smpl_t threshold) {
130        p->threshold = threshold;
131        return;
132}
133
134smpl_t aubio_peakpicker_get_threshold(aubio_pickpeak_t * p) {
135        return p->threshold;
136}
137
138void aubio_peakpicker_set_thresholdfn(aubio_pickpeak_t * p, aubio_thresholdfn_t thresholdfn) {
139        p->thresholdfn = thresholdfn;
140        return;
141}
142
143aubio_thresholdfn_t aubio_peakpicker_get_thresholdfn(aubio_pickpeak_t * p) {
144        return (aubio_thresholdfn_t) (p->thresholdfn);
145}
146
147aubio_pickpeak_t * new_aubio_peakpicker(smpl_t threshold) {
148        aubio_pickpeak_t * t = AUBIO_NEW(aubio_pickpeak_t);
149        t->threshold = 0.1; /* 0.0668; 0.33; 0.082; 0.033; */
150        if (threshold > 0. && threshold < 10.)
151                t->threshold = threshold;
152        t->win_post  = 5;
153        t->win_pre   = 1;
154
155        t->thresholdfn = (aubio_thresholdfn_t)(fvec_median); /* (fvec_mean); */
156        t->pickerfn = (aubio_pickerfn_t)(fvec_peakpick);
157
158        t->scratch = new_fvec(t->win_post+t->win_pre+1,1);
159        t->onset_keep = new_fvec(t->win_post+t->win_pre+1,1);
160        t->onset_proc = new_fvec(t->win_post+t->win_pre+1,1);
161        t->onset_peek = new_fvec(3,1);
162
163        /* cutoff: low-pass filter cutoff [0.34, 1] */
164        /* t->cutoff=0.34; */
165        t->biquad = new_aubio_biquad(0.1600,0.3200,0.1600,-0.5949,0.2348);
166        return t;
167}
168
169void del_aubio_peakpicker(aubio_pickpeak_t * p) {
170        del_aubio_biquad(p->biquad);
171        del_fvec(p->onset_keep);
172        del_fvec(p->onset_proc);
173        del_fvec(p->onset_peek);
174        del_fvec(p->scratch);
175        AUBIO_FREE(p);
176}
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