test/loopwave.c
author Sam Lantinga <slouken@lokigames.com>
Thu, 26 Apr 2001 16:45:43 +0000
changeset 0 74212992fb08
child 1151 be9c9c8f6d53
permissions -rw-r--r--
Initial revision
     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 
     8 #include <stdio.h>
     9 #include <stdlib.h>
    10 #include <signal.h>
    11 
    12 #include "SDL.h"
    13 #include "SDL_audio.h"
    14 
    15 struct {
    16 	SDL_AudioSpec spec;
    17 	Uint8   *sound;			/* Pointer to wave data */
    18 	Uint32   soundlen;		/* Length of wave data */
    19 	int      soundpos;		/* Current play position */
    20 } wave;
    21 
    22 void fillerup(void *unused, Uint8 *stream, int len)
    23 {
    24 	Uint8 *waveptr;
    25 	int    waveleft;
    26 
    27 	/* Set up the pointers */
    28 	waveptr = wave.sound + wave.soundpos;
    29 	waveleft = wave.soundlen - wave.soundpos;
    30 
    31 	/* Go! */
    32 	while ( waveleft <= len ) {
    33 		SDL_MixAudio(stream, waveptr, waveleft, SDL_MIX_MAXVOLUME);
    34 		stream += waveleft;
    35 		len -= waveleft;
    36 		waveptr = wave.sound;
    37 		waveleft = wave.soundlen;
    38 		wave.soundpos = 0;
    39 	}
    40 	SDL_MixAudio(stream, waveptr, len, SDL_MIX_MAXVOLUME);
    41 	wave.soundpos += len;
    42 }
    43 
    44 static int done = 0;
    45 void poked(int sig)
    46 {
    47 	done = 1;
    48 }
    49 
    50 int main(int argc, char *argv[])
    51 {
    52 	char name[32];
    53 
    54 	/* Load the SDL library */
    55 	if ( SDL_Init(SDL_INIT_AUDIO) < 0 ) {
    56 		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
    57 		exit(1);
    58 	}
    59 	atexit(SDL_Quit);
    60 
    61 	if ( argv[1] == NULL ) {
    62 		fprintf(stderr, "Usage: %s <wavefile>\n", argv[0]);
    63 		exit(1);
    64 	}
    65 
    66 	/* Load the wave file into memory */
    67 	if ( SDL_LoadWAV(argv[1],
    68 			&wave.spec, &wave.sound, &wave.soundlen) == NULL ) {
    69 		fprintf(stderr, "Couldn't load %s: %s\n",
    70 						argv[1], SDL_GetError());
    71 		exit(1);
    72 	}
    73 	wave.spec.callback = fillerup;
    74 
    75 	/* Set the signals */
    76 #ifdef SIGHUP
    77 	signal(SIGHUP, poked);
    78 #endif
    79 	signal(SIGINT, poked);
    80 #ifdef SIGQUIT
    81 	signal(SIGQUIT, poked);
    82 #endif
    83 	signal(SIGTERM, poked);
    84 
    85 	/* Initialize fillerup() variables */
    86 	if ( SDL_OpenAudio(&wave.spec, NULL) < 0 ) {
    87 		fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
    88 		SDL_FreeWAV(wave.sound);
    89 		exit(2);
    90 	}
    91 	SDL_PauseAudio(0);
    92 
    93 	/* Let the audio run */
    94 	printf("Using audio driver: %s\n", SDL_AudioDriverName(name, 32));
    95 	while ( ! done && (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING) )
    96 		SDL_Delay(1000);
    97 
    98 	/* Clean up on signal */
    99 	SDL_CloseAudio();
   100 	SDL_FreeWAV(wave.sound);
   101 	return(0);
   102 }