0
+ − 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 }
