This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
loopwave.c
1
2
3
4
5
6
/* Program to load a wave file and loop playing it using SDL sound */
/* loopwaves.c is much more robust in handling WAVE files --
This is only for simple WAVEs
*/
7
#include "SDL_config.h"
8
9
10
#include <stdio.h>
#include <stdlib.h>
11
12
#if HAVE_SIGNAL_H
13
#include <signal.h>
14
#endif
15
16
17
18
#include "SDL.h"
#include "SDL_audio.h"
19
20
21
22
23
24
struct
{
SDL_AudioSpec spec;
Uint8 *sound; /* Pointer to wave data */
Uint32 soundlen; /* Length of wave data */
int soundpos; /* Current play position */
25
26
} wave;
27
28
/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
29
30
static void
quit(int rc)
32
33
SDL_Quit();
exit(rc);
37
38
void SDLCALL
fillerup(void *unused, Uint8 * stream, int len)
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
Uint8 *waveptr;
int waveleft;
/* Set up the pointers */
waveptr = wave.sound + wave.soundpos;
waveleft = wave.soundlen - wave.soundpos;
/* Go! */
while (waveleft <= len) {
SDL_MixAudio(stream, waveptr, waveleft, SDL_MIX_MAXVOLUME);
stream += waveleft;
len -= waveleft;
waveptr = wave.sound;
waveleft = wave.soundlen;
wave.soundpos = 0;
}
SDL_MixAudio(stream, waveptr, len, SDL_MIX_MAXVOLUME);
wave.soundpos += len;
58
59
60
}
static int done = 0;
61
62
void
poked(int sig)
65
66
}
67
68
int
main(int argc, char *argv[])
70
71
72
73
74
75
76
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
int i, n;
/* Print available audio drivers */
n = SDL_GetNumAudioDrivers();
if (n == 0) {
printf("No built-in audio drivers\n");
} else {
printf("Built-in audio drivers:");
for (i = 0; i < n; ++i) {
if (i > 0) {
printf(",");
}
printf(" %s", SDL_GetAudioDriver(i));
}
printf("\n");
}
/* Load the SDL library */
if (SDL_Init(SDL_INIT_AUDIO) < 0) {
fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
return (1);
}
if (argv[1] == NULL) {
argv[1] = "sample.wav";
}
/* Load the wave file into memory */
if (SDL_LoadWAV(argv[1], &wave.spec, &wave.sound, &wave.soundlen) == NULL) {
fprintf(stderr, "Couldn't load %s: %s\n", argv[1], SDL_GetError());
quit(1);
}
wave.spec.callback = fillerup;
102
#if HAVE_SIGNAL_H
103
/* Set the signals */
104
#ifdef SIGHUP
105
signal(SIGHUP, poked);
106
#endif
107
signal(SIGINT, poked);
108
#ifdef SIGQUIT
109
signal(SIGQUIT, poked);
110
#endif
111
signal(SIGTERM, poked);
112
#endif /* HAVE_SIGNAL_H */
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/* Initialize fillerup() variables */
if (SDL_OpenAudio(&wave.spec, NULL) < 0) {
fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
SDL_FreeWAV(wave.sound);
quit(2);
}
SDL_PauseAudio(0);
/* Let the audio run */
printf("Using audio driver: %s\n", SDL_GetCurrentAudioDriver());
while (!done && (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING))
SDL_Delay(1000);
/* Clean up on signal */
SDL_CloseAudio();
SDL_FreeWAV(wave.sound);
SDL_Quit();
return (0);
132
}