1
2/* Program to load a wave file and loop playing it using SDL sound */
3
4/* loopwaves.c is much more robust in handling WAVE files --
5	This is only for simple WAVEs
6*/
7#include "SDL_config.h"
8
9#include <stdio.h>
10#include <stdlib.h>
11
12#if HAVE_SIGNAL_H
13#include <signal.h>
14#endif
15
16#include "SDL.h"
17#include "SDL_audio.h"
18
19struct {
20	SDL_AudioSpec spec;
21	Uint8   *sound;			/* Pointer to wave data */
22	Uint32   soundlen;		/* Length of wave data */
23	int      soundpos;		/* Current play position */
24} wave;
25
26
27/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
28static void quit(int rc)
29{
30	SDL_Quit();
31	exit(rc);
32}
33
34
35void SDLCALL fillerup(void *unused, Uint8 *stream, int len)
36{
37	Uint8 *waveptr;
38	int    waveleft;
39
40	/* Set up the pointers */
41	waveptr = wave.sound + wave.soundpos;
42	waveleft = wave.soundlen - wave.soundpos;
43
44	/* Go! */
45	while ( waveleft <= len ) {
46		SDL_memcpy(stream, waveptr, waveleft);
47		stream += waveleft;
48		len -= waveleft;
49		waveptr = wave.sound;
50		waveleft = wave.soundlen;
51		wave.soundpos = 0;
52	}
53	SDL_memcpy(stream, waveptr, len);
54	wave.soundpos += len;
55}
56
57static int done = 0;
58void poked(int sig)
59{
60	done = 1;
61}
62
63int main(int argc, char *argv[])
64{
65	char name[32];
66
67	/* Load the SDL library */
68	if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
69		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
70		return(1);
71	}
72	if ( argv[1] == NULL ) {
73		argv[1] = "sample.wav";
74	}
75	/* Load the wave file into memory */
76	if ( SDL_LoadWAV(argv[1],
77			&wave.spec, &wave.sound, &wave.soundlen) == NULL ) {
78		fprintf(stderr, "Couldn't load %s: %s\n",
79						argv[1], SDL_GetError());
80		quit(1);
81	}
82
83	wave.spec.callback = fillerup;
84#if HAVE_SIGNAL_H
85	/* Set the signals */
86#ifdef SIGHUP
87	signal(SIGHUP, poked);
88#endif
89	signal(SIGINT, poked);
90#ifdef SIGQUIT
91	signal(SIGQUIT, poked);
92#endif
93	signal(SIGTERM, poked);
94#endif /* HAVE_SIGNAL_H */
95
96	/* Initialize fillerup() variables */
97	if ( SDL_OpenAudio(&wave.spec, NULL) < 0 ) {
98		fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
99		SDL_FreeWAV(wave.sound);
100		quit(2);
101	}
102	SDL_PauseAudio(0);
103
104	/* Let the audio run */
105	printf("Using audio driver: %s\n", SDL_AudioDriverName(name, 32));
106	while ( ! done && (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING) )
107		SDL_Delay(1000);
108
109	/* Clean up on signal */
110	SDL_CloseAudio();
111	SDL_FreeWAV(wave.sound);
112	SDL_Quit();
113	return(0);
114}
115