+
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/* Program to load a wave file and loop playing it using SDL sound */+
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+
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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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+
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#include <stdio.h>+
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#include <stdlib.h>+
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#include <signal.h>+
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+
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#include "SDL.h"+
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#include "SDL_audio.h"+
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+
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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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+
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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	if ( argv[1] == NULL ) {+
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		fprintf(stderr, "Usage: %s <wavefile>\n", argv[0]);+
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		quit(1);+
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	}+
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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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+
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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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+
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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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+
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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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+
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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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}+
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