source: src/pitch/pitchschmitt.c @ 5288874

feature/autosinkfeature/cnnfeature/cnn_orgfeature/constantqfeature/crepefeature/crepe_orgfeature/pitchshiftfeature/pydocstringsfeature/timestretchfix/ffmpeg5pitchshiftsamplertimestretchyinfft+
Last change on this file since 5288874 was 5288874, checked in by Paul Brossier <piem@piem.org>, 16 years ago

src/pitch/pitchschmitt.c: move buffer to private structure, closes #8

  • Property mode set to 100644
File size: 3.3 KB
Line 
1/*
2   Copyright (C) 2004, 2005  Mario Lang <mlang@delysid.org>
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 "pitch/pitchschmitt.h"
23
24smpl_t aubio_schmittS16LE (aubio_pitchschmitt_t *p, uint_t nframes, signed short int *indata);
25
26struct _aubio_pitchschmitt_t {
27        uint_t blockSize;
28        uint_t rate;
29        signed short int *schmittBuffer;
30        signed short int *schmittPointer;
31        signed short int *buf;
32};
33
34aubio_pitchschmitt_t * new_aubio_pitchschmitt (uint_t size, uint_t samplerate)
35{
36  aubio_pitchschmitt_t * p = AUBIO_NEW(aubio_pitchschmitt_t);
37  p->blockSize = size;
38  p->schmittBuffer = AUBIO_ARRAY(signed short int,p->blockSize);
39  p->buf = AUBIO_ARRAY(signed short int,p->blockSize);
40  p->schmittPointer = p->schmittBuffer;
41  p->rate = samplerate;
42  return p;
43}
44
45smpl_t aubio_pitchschmitt_detect (aubio_pitchschmitt_t *p, fvec_t * input)
46{
47  uint_t i;
48  for (i=0; i<input->length; i++) {
49    p->buf[i] = input->data[0][i]*32768.;
50  }
51  return aubio_schmittS16LE(p, input->length, p->buf);
52}
53
54smpl_t aubio_schmittS16LE (aubio_pitchschmitt_t *p, uint_t nframes, signed short int *indata)
55{
56  uint_t i, j;
57  uint_t blockSize = p->blockSize;
58  signed short int *schmittBuffer = p->schmittBuffer;
59  signed short int *schmittPointer = p->schmittPointer;
60
61  smpl_t freq = 0., trigfact = 0.6;
62
63  for (i=0; i<nframes; i++) {
64    *schmittPointer++ = indata[i];
65    if (schmittPointer-schmittBuffer >= (sint_t)blockSize) {
66      sint_t endpoint, startpoint, t1, t2, A1, A2, tc, schmittTriggered;
67
68      schmittPointer = schmittBuffer;
69
70      for (j=0,A1=0,A2=0; j<blockSize; j++) {
71        if (schmittBuffer[j]>0 && A1<schmittBuffer[j])  A1 = schmittBuffer[j];
72        if (schmittBuffer[j]<0 && A2<-schmittBuffer[j]) A2 = -schmittBuffer[j];
73      }
74      t1 =   (sint_t)( A1 * trigfact + 0.5);
75      t2 = - (sint_t)( A2 * trigfact + 0.5);
76      startpoint=0;
77      for (j=1; schmittBuffer[j]<=t1 && j<blockSize; j++);
78      for (; !(schmittBuffer[j]  >=t2 &&
79               schmittBuffer[j+1]< t2) && j<blockSize; j++);
80      startpoint=j;
81      schmittTriggered=0;
82      endpoint=startpoint+1;
83      for(j=startpoint,tc=0; j<blockSize; j++) {
84        if (!schmittTriggered) {
85          schmittTriggered = (schmittBuffer[j] >= t1);
86        } else if (schmittBuffer[j]>=t2 && schmittBuffer[j+1]<t2) {
87          endpoint=j;
88          tc++;
89          schmittTriggered = 0;
90        }
91      }
92      if (endpoint > startpoint) {
93        freq = ((smpl_t)p->rate*(tc/(smpl_t)(endpoint-startpoint)));
94      }
95    }
96  }
97
98  p->schmittBuffer  = schmittBuffer;
99  p->schmittPointer = schmittPointer;
100  return freq;
101}
102
103void del_aubio_pitchschmitt (aubio_pitchschmitt_t *p)
104{
105  AUBIO_FREE(p->schmittBuffer);
106  AUBIO_FREE(p);
107}
108
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