test/loopwave.c
author Sam Lantinga <slouken@libsdl.org>
Fri, 03 Mar 2006 04:43:42 +0000
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/* Program to load a wave file and loop playing it using SDL sound */
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/* loopwaves.c is much more robust in handling WAVE files -- 
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	This is only for simple WAVEs
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*/
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#include "SDL_config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#if HAVE_SIGNAL_H
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#include <signal.h>
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#endif
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#include "SDL.h"
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#include "SDL_audio.h"
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struct {
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	SDL_AudioSpec spec;
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	Uint8   *sound;			/* Pointer to wave data */
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	Uint32   soundlen;		/* Length of wave data */
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	int      soundpos;		/* Current play position */
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} wave;
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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static void quit(int rc)
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{
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	SDL_Quit();
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	exit(rc);
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}
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void fillerup(void *unused, Uint8 *stream, int len)
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{
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	Uint8 *waveptr;
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	int    waveleft;
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	/* Set up the pointers */
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	waveptr = wave.sound + wave.soundpos;
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	waveleft = wave.soundlen - wave.soundpos;
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	/* Go! */
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	while ( waveleft <= len ) {
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		SDL_MixAudio(stream, waveptr, waveleft, SDL_MIX_MAXVOLUME);
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		stream += waveleft;
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		len -= waveleft;
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		waveptr = wave.sound;
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		waveleft = wave.soundlen;
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		wave.soundpos = 0;
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	}
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	SDL_MixAudio(stream, waveptr, len, SDL_MIX_MAXVOLUME);
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	wave.soundpos += len;
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}
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static int done = 0;
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void poked(int sig)
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{
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	done = 1;
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}
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int main(int argc, char *argv[])
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{
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	char name[32];
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	/* Load the SDL library */
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	if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
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		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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		return(1);
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	}
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	if ( argv[1] == NULL ) {
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		argv[1] = "sample.wav";
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	}
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	/* Load the wave file into memory */
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	if ( SDL_LoadWAV(argv[1],
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			&wave.spec, &wave.sound, &wave.soundlen) == NULL ) {
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		fprintf(stderr, "Couldn't load %s: %s\n",
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						argv[1], SDL_GetError());
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		quit(1);
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	}
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	wave.spec.callback = fillerup;
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#if HAVE_SIGNAL_H
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	/* Set the signals */
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#ifdef SIGHUP
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	signal(SIGHUP, poked);
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#endif
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	signal(SIGINT, poked);
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#ifdef SIGQUIT
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	signal(SIGQUIT, poked);
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#endif
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	signal(SIGTERM, poked);
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#endif /* HAVE_SIGNAL_H */
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	/* Initialize fillerup() variables */
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	if ( SDL_OpenAudio(&wave.spec, NULL) < 0 ) {
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		fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
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		SDL_FreeWAV(wave.sound);
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		quit(2);
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	}
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	SDL_PauseAudio(0);
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	/* Let the audio run */
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	printf("Using audio driver: %s\n", SDL_AudioDriverName(name, 32));
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	while ( ! done && (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING) )
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		SDL_Delay(1000);
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	/* Clean up on signal */
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	SDL_CloseAudio();
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	SDL_FreeWAV(wave.sound);
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	SDL_Quit();
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	return(0);
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}