source: src/peakpick.c @ 82c588a

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since 82c588a was 72b649d, checked in by Paul Brossier <piem@altern.org>, 18 years ago

update peakpick deletion function
update peakpick deletion function

  • Property mode set to 100644
File size: 5.6 KB
Line 
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 "sample.h"
22#include "mathutils.h"
23#include "biquad.h"
24#include "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  */
70uint_t aubio_peakpick_pimrt(fvec_t * onset,  aubio_pickpeak_t * p) {
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        uint_t length = p->win_post + p->win_pre + 1;
77        uint_t i = 0, j;
78
79        /* store onset in onset_keep */
80        /* shift all elements but last, then write last */
81        /* for (i=0;i<channels;i++) { */
82        for (j=0;j<length-1;j++) {
83                onset_keep->data[i][j] = onset_keep->data[i][j+1];
84                onset_proc->data[i][j] = onset_keep->data[i][j];
85        }
86        onset_keep->data[i][length-1] = onset->data[i][0];
87        onset_proc->data[i][length-1] = onset->data[i][0];
88        /* } */
89
90        /* filter onset_proc */
91        /** \bug filtfilt calculated post+pre times, should be only once !? */
92        aubio_biquad_do_filtfilt(p->biquad,onset_proc,scratch);
93
94        /* calculate mean and median for onset_proc */
95        /* for (i=0;i<onset_proc->channels;i++) { */
96        mean = vec_mean(onset_proc);
97        /* copy to scratch */
98        for (j = 0; j < length; j++)
99                scratch->data[i][j] = onset_proc->data[i][j];
100        median = p->thresholdfn(scratch);
101        /* } */
102
103        /* for (i=0;i<onset->channels;i++) { */
104        /* shift peek array */
105        for (j=0;j<3-1;j++) 
106                onset_peek->data[i][j] = onset_peek->data[i][j+1];
107        /* calculate new peek value */
108        onset_peek->data[i][2] = 
109                onset_proc->data[i][p->win_post] - median - mean * p->threshold;
110        /* } */
111        //AUBIO_DBG("%f\n", onset_peek->data[0][2]);
112        return (p->pickerfn)(onset_peek,1);
113}
114
115/** this method returns the current value in the pick peaking buffer
116 * after smoothing
117 */
118smpl_t aubio_peakpick_pimrt_getval(aubio_pickpeak_t * p) 
119{
120        uint_t i = 0;
121        return p->onset_peek->data[i][1];
122}
123
124/** function added by Miguel Ramirez to return the onset detection amplitude in peakval */
125uint_t aubio_peakpick_pimrt_wt(fvec_t * onset,  aubio_pickpeak_t * p, smpl_t* peakval) 
126{
127        uint_t isonset = 0;
128        isonset = aubio_peakpick_pimrt(onset,p);
129
130        //if ( isonset && peakval != NULL )
131        if ( peakval != NULL )
132                *peakval = aubio_peakpick_pimrt_getval(p); 
133
134        return isonset;
135}
136
137void aubio_peakpicker_set_threshold(aubio_pickpeak_t * p, smpl_t threshold) {
138        p->threshold = threshold;
139        return;
140}
141
142smpl_t aubio_peakpicker_get_threshold(aubio_pickpeak_t * p) {
143        return p->threshold;
144}
145
146void aubio_peakpicker_set_thresholdfn(aubio_pickpeak_t * p, aubio_thresholdfn_t thresholdfn) {
147        p->thresholdfn = thresholdfn;
148        return;
149}
150
151aubio_thresholdfn_t aubio_peakpicker_get_thresholdfn(aubio_pickpeak_t * p) {
152        return (aubio_thresholdfn_t) (p->thresholdfn);
153}
154
155aubio_pickpeak_t * new_aubio_peakpicker(smpl_t threshold) {
156        aubio_pickpeak_t * t = AUBIO_NEW(aubio_pickpeak_t);
157        t->threshold = 0.1; /* 0.0668; 0.33; 0.082; 0.033; */
158        if (threshold > 0. && threshold < 10.)
159                t->threshold = threshold;
160        t->win_post  = 5;
161        t->win_pre   = 1;
162
163        t->thresholdfn = (aubio_thresholdfn_t)(vec_median); /* (vec_mean); */
164        t->pickerfn = (aubio_pickerfn_t)(vec_peakpick);
165
166        t->scratch = new_fvec(t->win_post+t->win_pre+1,1);
167        t->onset_keep = new_fvec(t->win_post+t->win_pre+1,1);
168        t->onset_proc = new_fvec(t->win_post+t->win_pre+1,1);
169        t->onset_peek = new_fvec(3,1);
170
171        /* cutoff: low-pass filter cutoff [0.34, 1] */
172        /* t->cutoff=0.34; */
173        t->biquad = new_aubio_biquad(0.1600,0.3200,0.1600,-0.5949,0.2348);
174        return t;
175}
176
177void del_aubio_peakpicker(aubio_pickpeak_t * p) {
178        del_aubio_biquad(p->biquad);
179        del_fvec(p->onset_keep);
180        del_fvec(p->onset_proc);
181        del_fvec(p->onset_peek);
182        del_fvec(p->scratch);
183        AUBIO_FREE(p);
184}
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