FFmpeg
sofa2wavs.c
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1 /*
2  * Copyright (c) 2017 Paul B Mahol
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg 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 GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <sys/stat.h>
22 #include <sys/types.h>
23 #include <unistd.h>
24 #include <stdio.h>
25 #include <mysofa.h>
26 
27 int main(int argc, char **argv)
28 {
29  struct MYSOFA_HRTF *hrtf;
30  int sample_rate;
31  int err, i, j;
32 
33  if (argc < 3) {
34  printf("usage: %s input_SOFA_file output_directory\n", argv[0]);
35  return 1;
36  }
37 
38  hrtf = mysofa_load(argv[1], &err);
39  if (!hrtf || err) {
40  printf("invalid input SOFA file: %s\n", argv[1]);
41  return 1;
42  }
43 
44  if (hrtf->DataSamplingRate.elements != 1)
45  goto fail;
46  sample_rate = hrtf->DataSamplingRate.values[0];
47 
48  err = mkdir(argv[2], 0744);
49  if (err)
50  goto fail;
51 
52  err = chdir(argv[2]);
53  if (err)
54  goto fail;
55 
56  for (i = 0; i < hrtf->M; i++) {
57  FILE *file;
58  int bps = 32;
59  int blkalign = 8;
60  int bytespersec = blkalign * sample_rate;
61  char filename[1024];
62  int azi = hrtf->SourcePosition.values[i * 3];
63  int ele = hrtf->SourcePosition.values[i * 3 + 1];
64  int dis = hrtf->SourcePosition.values[i * 3 + 2];
65  int size = 8 * hrtf->N;
66  int offset = i * 2 * hrtf->N;
67 
68  snprintf(filename, sizeof(filename), "azi_%d_ele_%d_dis_%d.wav", azi, ele, dis);
69  file = fopen(filename, "w+");
70  fwrite("RIFF", 4, 1, file);
71  fwrite("\xFF\xFF\xFF\xFF", 4, 1, file);
72  fwrite("WAVE", 4, 1, file);
73  fwrite("fmt ", 4, 1, file);
74  fwrite("\x10\x00\00\00", 4, 1, file);
75  fwrite("\x03\x00", 2, 1, file);
76  fwrite("\x02\x00", 2, 1, file);
77  fwrite(&sample_rate, 4, 1, file);
78  fwrite(&bytespersec, 4, 1, file);
79  fwrite(&blkalign, 2, 1, file);
80  fwrite(&bps, 2, 1, file);
81  fwrite("data", 4, 1, file);
82  fwrite(&size, 4, 1, file);
83 
84  for (j = 0; j < hrtf->N; j++) {
85  float l, r;
86 
87  l = hrtf->DataIR.values[offset + j];
88  r = hrtf->DataIR.values[offset + j + hrtf->N];
89  fwrite(&l, 4, 1, file);
90  fwrite(&r, 4, 1, file);
91  }
92  fclose(file);
93  }
94 
95 fail:
96  mysofa_free(hrtf);
97 
98  return 0;
99 }
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
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sample_rate
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