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