This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
testresample.c
1
2
3
#include <stdio.h>
#include "SDL.h"
4
5
int
main(int argc, char **argv)
6
7
8
9
10
11
12
13
14
15
16
{
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;
17
if (argc != 4) {
18
19
20
21
22
23
fprintf(stderr, "USAGE: %s in.wav out.wav newfreq\n", argv[0]);
return 1;
}
cvtfreq = atoi(argv[3]);
24
if (SDL_Init(SDL_INIT_AUDIO) == -1) {
25
26
27
28
fprintf(stderr, "SDL_Init() failed: %s\n", SDL_GetError());
return 2;
}
29
if (SDL_LoadWAV(argv[1], &spec, &data, &len) == NULL) {
30
31
32
33
34
35
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,
36
spec.format, spec.channels, cvtfreq) == -1) {
37
38
39
40
41
42
43
44
fprintf(stderr, "failed to build CVT: %s\n", SDL_GetError());
SDL_FreeWAV(data);
SDL_Quit();
return 4;
}
cvt.len = len;
cvt.buf = (Uint8 *) malloc(len * cvt.len_mult);
45
if (cvt.buf == NULL) {
46
47
48
49
50
51
52
fprintf(stderr, "Out of memory.\n");
SDL_FreeWAV(data);
SDL_Quit();
return 5;
}
memcpy(cvt.buf, data, len);
53
if (SDL_ConvertAudio(&cvt) == -1) {
54
55
56
57
58
59
60
61
62
fprintf(stderr, "Conversion failed: %s\n", SDL_GetError());
free(cvt.buf);
SDL_FreeWAV(data);
SDL_Quit();
return 6;
}
/* write out a WAV header... */
io = SDL_RWFromFile(argv[2], "wb");
63
if (io == NULL) {
64
65
66
67
68
69
70
71
72
73
74
fprintf(stderr, "fopen('%s') failed: %s\n", argv[2], SDL_GetError());
free(cvt.buf);
SDL_FreeWAV(data);
SDL_Quit();
return 7;
}
bitsize = SDL_AUDIO_BITSIZE(spec.format);
blockalign = (bitsize / 8) * spec.channels;
avgbytes = cvtfreq * blockalign;
75
SDL_WriteLE32(io, 0x46464952); /* RIFF */
76
SDL_WriteLE32(io, len * cvt.len_mult + 36);
77
78
79
80
81
82
83
84
85
86
87
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 */
88
SDL_RWwrite(io, cvt.buf, cvt.len_cvt, 1);
90
if (SDL_RWclose(io) == -1) {
91
92
93
94
95
fprintf(stderr, "fclose('%s') failed: %s\n", argv[2], SDL_GetError());
free(cvt.buf);
SDL_FreeWAV(data);
SDL_Quit();
return 8;
96
} // if
97
98
99
100
101
free(cvt.buf);
SDL_FreeWAV(data);
SDL_Quit();
return 0;
102
} // main
103
104
// end of resample_test.c ...