This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
testresample.c
2
Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/
#include <stdio.h>
#include "SDL.h"
int
main(int argc, char **argv)
{
SDL_AudioSpec spec;
SDL_AudioCVT cvt;
Uint32 len = 0;
Uint8 *data = NULL;
int cvtfreq = 0;
int bitsize = 0;
int blockalign = 0;
int avgbytes = 0;
SDL_RWops *io = NULL;
if (argc != 4) {
fprintf(stderr, "USAGE: %s in.wav out.wav newfreq\n", argv[0]);
return 1;
}
33
cvtfreq = SDL_atoi(argv[3]);
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
if (SDL_Init(SDL_INIT_AUDIO) == -1) {
fprintf(stderr, "SDL_Init() failed: %s\n", SDL_GetError());
return 2;
}
if (SDL_LoadWAV(argv[1], &spec, &data, &len) == NULL) {
fprintf(stderr, "failed to load %s: %s\n", argv[1], SDL_GetError());
SDL_Quit();
return 3;
}
if (SDL_BuildAudioCVT(&cvt, spec.format, spec.channels, spec.freq,
spec.format, spec.channels, cvtfreq) == -1) {
fprintf(stderr, "failed to build CVT: %s\n", SDL_GetError());
SDL_FreeWAV(data);
SDL_Quit();
return 4;
}
cvt.len = len;
55
cvt.buf = (Uint8 *) SDL_malloc(len * cvt.len_mult);
56
57
58
59
60
61
if (cvt.buf == NULL) {
fprintf(stderr, "Out of memory.\n");
SDL_FreeWAV(data);
SDL_Quit();
return 5;
}
62
SDL_memcpy(cvt.buf, data, len);
63
64
65
if (SDL_ConvertAudio(&cvt) == -1) {
fprintf(stderr, "Conversion failed: %s\n", SDL_GetError());
66
SDL_free(cvt.buf);
67
68
69
70
71
72
73
74
75
SDL_FreeWAV(data);
SDL_Quit();
return 6;
}
/* write out a WAV header... */
io = SDL_RWFromFile(argv[2], "wb");
if (io == NULL) {
fprintf(stderr, "fopen('%s') failed: %s\n", argv[2], SDL_GetError());
76
SDL_free(cvt.buf);
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
SDL_FreeWAV(data);
SDL_Quit();
return 7;
}
bitsize = SDL_AUDIO_BITSIZE(spec.format);
blockalign = (bitsize / 8) * spec.channels;
avgbytes = cvtfreq * blockalign;
SDL_WriteLE32(io, 0x46464952); /* RIFF */
SDL_WriteLE32(io, len * cvt.len_mult + 36);
SDL_WriteLE32(io, 0x45564157); /* WAVE */
SDL_WriteLE32(io, 0x20746D66); /* fmt */
SDL_WriteLE32(io, 16); /* chunk size */
SDL_WriteLE16(io, 1); /* uncompressed */
SDL_WriteLE16(io, spec.channels); /* channels */
SDL_WriteLE32(io, cvtfreq); /* sample rate */
SDL_WriteLE32(io, avgbytes); /* average bytes per second */
SDL_WriteLE16(io, blockalign); /* block align */
SDL_WriteLE16(io, bitsize); /* significant bits per sample */
SDL_WriteLE32(io, 0x61746164); /* data */
SDL_WriteLE32(io, cvt.len_cvt); /* size */
SDL_RWwrite(io, cvt.buf, cvt.len_cvt, 1);
if (SDL_RWclose(io) == -1) {
fprintf(stderr, "fclose('%s') failed: %s\n", argv[2], SDL_GetError());
103
SDL_free(cvt.buf);
104
105
106
107
108
SDL_FreeWAV(data);
SDL_Quit();
return 8;
} // if
109
SDL_free(cvt.buf);
110
111
112
113
114
115
SDL_FreeWAV(data);
SDL_Quit();
return 0;
} // main
// end of resample_test.c ...