source: src/io/source_sndfile.c @ 87dfc3f

feature/autosinkfeature/constantqfeature/pitchshiftfeature/pydocstringsfeature/timestretchpitchshiftsamplertimestretchyinfft+
Last change on this file since 87dfc3f was 87dfc3f, checked in by Paul Brossier <piem@piem.org>, 8 years ago

src/io/source_sndfile.c: add support for resampling

  • Property mode set to 100644
File size: 4.5 KB
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1/*
2  Copyright (C) 2012 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
22#include "config.h"
23
24#ifdef HAVE_SNDFILE
25
26#include <sndfile.h>
27
28#include "aubio_priv.h"
29#include "source_sndfile.h"
30#include "fvec.h"
31
32#include "temporal/resampler.h"
33
34#define MAX_CHANNELS 6
35#define MAX_SIZE 4096
36
37struct _aubio_source_sndfile_t {
38  uint_t hop_size;
39  uint_t samplerate;
40  uint_t channels;
41  int input_samplerate;
42  int input_channels;
43  int input_format;
44  char_t *path;
45  SNDFILE *handle;
46  uint_t scratch_size;
47  smpl_t *scratch_data;
48
49  smpl_t ratio;
50
51#ifdef HAVE_SAMPLERATE
52  aubio_resampler_t *resampler;
53  fvec_t *resampled_data;
54#endif /* HAVE_SAMPLERATE */
55};
56
57aubio_source_sndfile_t * new_aubio_source_sndfile(char_t * path, uint_t samplerate, uint_t hop_size) {
58  aubio_source_sndfile_t * s = AUBIO_NEW(aubio_source_sndfile_t);
59
60  if (path == NULL) {
61    AUBIO_ERR("Aborted opening null path\n");
62    return NULL;
63  }
64
65  s->hop_size = hop_size;
66  s->samplerate = samplerate;
67  s->channels = 1;
68  s->path = path;
69
70  // try opening the file, geting the info in sfinfo
71  SF_INFO sfinfo;
72  AUBIO_MEMSET(&sfinfo, 0, sizeof (sfinfo));
73  s->handle = sf_open (s->path, SFM_READ, &sfinfo);
74
75  if (s->handle == NULL) {
76    /* show libsndfile err msg */
77    AUBIO_ERR("Failed opening %s: %s\n", s->path, sf_strerror (NULL));
78    return NULL;
79  }     
80
81  if (sfinfo.channels > MAX_CHANNELS) {
82    AUBIO_ERR("Not able to process more than %d channels\n", MAX_CHANNELS);
83    return NULL;
84  }
85
86  /* get input specs */
87  s->input_samplerate = sfinfo.samplerate;
88  s->input_channels   = sfinfo.channels;
89  s->input_format     = sfinfo.format;
90
91  s->ratio = s->samplerate/(float)s->input_samplerate;
92
93  if (s->ratio != 1) {
94#ifdef HAVE_SAMPLERATE
95    s->resampler = new_aubio_resampler(s->ratio, 0);
96    s->resampled_data = new_fvec(s->hop_size / s->ratio);
97    if (s-> ratio > 1) {
98      AUBIO_WRN("upsampling from %d to % d\n", s->input_samplerate, s->samplerate);
99    }
100#else
101    AUBIO_ERR("can not read %s at samplerate %dHz\n", s->path, s->samplerate);
102    AUBIO_ERR("aubio was compiled without aubio_resampler\n");
103    return NULL;
104#endif /* HAVE_SAMPLERATE */
105  }
106
107  s->scratch_size = s->hop_size * s->input_channels / s->ratio;
108  /* allocate data for de/interleaving reallocated when needed. */
109  if (s->scratch_size >= MAX_SIZE * MAX_CHANNELS) {
110    AUBIO_ERR("%d x %d exceeds maximum aubio_source_sndfile buffer size %d\n",
111        s->hop_size, s->input_channels, MAX_CHANNELS * MAX_CHANNELS);
112    return NULL;
113  }
114  s->scratch_data = AUBIO_ARRAY(float,s->scratch_size);
115
116  return s;
117}
118
119void aubio_source_sndfile_do(aubio_source_sndfile_t * s, fvec_t * read_data, uint_t * read){
120  sf_count_t read_frames;
121  int i,j, input_channels = s->input_channels;
122  int aread;
123  /* do actual reading */
124  read_frames = sf_read_float (s->handle, s->scratch_data, s->scratch_size);
125
126  smpl_t *data;
127
128#ifdef HAVE_SAMPLERATE
129  if (s->resampler) {
130    data = s->resampled_data->data;
131  } else
132#endif /* HAVE_SAMPLERATE */
133  {
134    data = read_data->data;
135  }
136  aread = (int)FLOOR(s->ratio * read_frames / (float)input_channels + .5);
137
138  /* de-interleaving and down-mixing data  */
139  for (j = 0; j < read_frames; j++) {
140    data[j] = 0;
141    for (i = 0; i < input_channels; i++) {
142      data[j] += (smpl_t)s->scratch_data[input_channels*j+i];
143    }
144    data[j] /= (smpl_t)input_channels;
145  }
146
147#ifdef HAVE_SAMPLERATE
148  if (s->resampler) {
149    aubio_resampler_do(s->resampler, s->resampled_data, read_data);
150    data = s->resampled_data->data;
151  }
152#endif /* HAVE_SAMPLERATE */
153
154  *read = aread;
155}
156
157void del_aubio_source_sndfile(aubio_source_sndfile_t * s){
158  if (!s) return;
159  if (sf_close(s->handle)) {
160    AUBIO_ERR("Error closing file %s: %s", s->path, sf_strerror (NULL));
161  }
162#ifdef HAVE_SAMPLERATE
163  if (s->resampler) {
164    del_aubio_resampler(s->resampler);
165  }
166  if (s->resampled_data) {
167    del_fvec(s->resampled_data);
168  }
169#endif /* HAVE_SAMPLERATE */
170  AUBIO_FREE(s->scratch_data);
171  AUBIO_FREE(s);
172}
173
174#endif /* HAVE_SNDFILE */
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