source: src/utils/hist.c @ 55d1fa4

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 55d1fa4 was 55d1fa4, checked in by Paul Brossier <piem@piem.org>, 3 years ago

src/utils/: add const qualifiers

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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 "utils/scale.h"
24#include "mathutils.h" //fvec_min fvec_max
25#include "utils/hist.h"
26
27/********
28 * Object Structure
29 */
30
31struct _aubio_hist_t {
32  fvec_t * hist;
33  uint_t nelems;
34  fvec_t * cent;
35  aubio_scale_t *scaler;
36};
37
38/**
39 * Object creation/deletion calls
40 */
41aubio_hist_t * new_aubio_hist (smpl_t flow, smpl_t fhig, uint_t nelems){
42  aubio_hist_t * s = AUBIO_NEW(aubio_hist_t);
43  smpl_t step = (fhig-flow)/(smpl_t)(nelems);
44  smpl_t accum = step;
45  uint_t i;
46  s->nelems = nelems;
47  s->hist = new_fvec(nelems);
48  s->cent = new_fvec(nelems);
49
50  /* use scale to map flow/fhig -> 0/nelems */
51  s->scaler = new_aubio_scale(flow,fhig,0,nelems);
52  /* calculate centers now once */
53  s->cent->data[0] = flow + 0.5 * step;
54  for (i=1; i < s->nelems; i++, accum+=step )
55    s->cent->data[i] = s->cent->data[0] + accum;
56
57  return s;
58}
59
60void del_aubio_hist(aubio_hist_t *s) {
61  del_fvec(s->hist);
62  del_fvec(s->cent);
63  del_aubio_scale(s->scaler);
64  AUBIO_FREE(s);
65}
66
67/***
68 * do it
69 */
70void aubio_hist_do (aubio_hist_t *s, fvec_t *input) {
71  uint_t j;
72  sint_t tmp = 0;
73  aubio_scale_do(s->scaler, input);
74  /* reset data */
75  fvec_zeros(s->hist);
76  /* run accum */
77  for (j=0;  j < input->length; j++)
78  {
79    tmp = (sint_t)FLOOR(input->data[j]);
80    if ((tmp >= 0) && (tmp < (sint_t)s->nelems)) {
81      s->hist->data[tmp] += 1;
82    }
83  }
84}
85
86void aubio_hist_do_notnull (aubio_hist_t *s, fvec_t *input) {
87  uint_t j;
88  sint_t tmp = 0;
89  aubio_scale_do(s->scaler, input);
90  /* reset data */
91  fvec_zeros(s->hist);
92  /* run accum */
93  for (j=0;  j < input->length; j++) {
94    if (input->data[j] != 0) {
95      tmp = (sint_t)FLOOR(input->data[j]);
96      if ((tmp >= 0) && (tmp < (sint_t)s->nelems))
97        s->hist->data[tmp] += 1;
98    }
99  }
100}
101
102
103void aubio_hist_dyn_notnull (aubio_hist_t *s, fvec_t *input) {
104  uint_t i;
105  sint_t tmp = 0;
106  smpl_t ilow = fvec_min(input);
107  smpl_t ihig = fvec_max(input);
108  smpl_t step = (ihig-ilow)/(smpl_t)(s->nelems);
109
110  /* readapt */
111  aubio_scale_set_limits (s->scaler, ilow, ihig, 0, s->nelems);
112
113  /* recalculate centers */
114  s->cent->data[0] = ilow + 0.5f * step;
115  for (i=1; i < s->nelems; i++)
116    s->cent->data[i] = s->cent->data[0] + i * step;
117
118  /* scale */
119  aubio_scale_do(s->scaler, input);
120
121  /* reset data */
122  fvec_zeros(s->hist);
123  /* run accum */
124  for (i=0;  i < input->length; i++) {
125    if (input->data[i] != 0) {
126      tmp = (sint_t)FLOOR(input->data[i]);
127      if ((tmp >= 0) && (tmp < (sint_t)s->nelems))
128        s->hist->data[tmp] += 1;
129    }
130  }
131}
132
133void aubio_hist_weight (aubio_hist_t *s) {
134  uint_t j;
135  for (j=0; j < s->nelems; j++) {
136    s->hist->data[j] *= s->cent->data[j];
137  }
138}
139
140smpl_t aubio_hist_mean (const aubio_hist_t *s) {
141  uint_t j;
142  smpl_t tmp = 0.0;
143  for (j=0; j < s->nelems; j++)
144    tmp += s->hist->data[j];
145  return tmp/(smpl_t)(s->nelems);
146}
147
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