1 /* 2 Copyright (C) 1997-2014 Sam Lantinga <slouken (at) libsdl.org> 3 4 This software is provided 'as-is', without any express or implied 5 warranty. In no event will the authors be held liable for any damages 6 arising from the use of this software. 7 8 Permission is granted to anyone to use this software for any purpose, 9 including commercial applications, and to alter it and redistribute it 10 freely. 11 */ 12 13 /* Program to load a wave file and loop playing it using SDL sound */ 14 15 /* loopwaves.c is much more robust in handling WAVE files -- 16 This is only for simple WAVEs 17 */ 18 #include "SDL_config.h" 19 20 #include <stdio.h> 21 #include <stdlib.h> 22 23 #if HAVE_SIGNAL_H 24 #include <signal.h> 25 #endif 26 27 #include "SDL.h" 28 #include "SDL_audio.h" 29 30 struct 31 { 32 SDL_AudioSpec spec; 33 Uint8 *sound; /* Pointer to wave data */ 34 Uint32 soundlen; /* Length of wave data */ 35 int soundpos; /* Current play position */ 36 } wave; 37 38 39 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ 40 static void 41 quit(int rc) 42 { 43 SDL_Quit(); 44 exit(rc); 45 } 46 47 48 void SDLCALL 49 fillerup(void *unused, Uint8 * stream, int len) 50 { 51 Uint8 *waveptr; 52 int waveleft; 53 54 /* Set up the pointers */ 55 waveptr = wave.sound + wave.soundpos; 56 waveleft = wave.soundlen - wave.soundpos; 57 58 /* Go! */ 59 while (waveleft <= len) { 60 SDL_memcpy(stream, waveptr, waveleft); 61 stream += waveleft; 62 len -= waveleft; 63 waveptr = wave.sound; 64 waveleft = wave.soundlen; 65 wave.soundpos = 0; 66 } 67 SDL_memcpy(stream, waveptr, len); 68 wave.soundpos += len; 69 } 70 71 static int done = 0; 72 void 73 poked(int sig) 74 { 75 done = 1; 76 } 77 78 int 79 main(int argc, char *argv[]) 80 { 81 int i; 82 char filename[4096]; 83 84 /* Enable standard application logging */ 85 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO); 86 87 /* Load the SDL library */ 88 if (SDL_Init(SDL_INIT_AUDIO) < 0) { 89 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError()); 90 return (1); 91 } 92 93 if (argc >= 1) { 94 SDL_strlcpy(filename, argv[1], sizeof(filename)); 95 } else { 96 SDL_strlcpy(filename, "sample.wav", sizeof(filename)); 97 } 98 /* Load the wave file into memory */ 99 if (SDL_LoadWAV(filename, &wave.spec, &wave.sound, &wave.soundlen) == NULL) { 100 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", argv[1], SDL_GetError()); 101 quit(1); 102 } 103 104 wave.spec.callback = fillerup; 105 #if HAVE_SIGNAL_H 106 /* Set the signals */ 107 #ifdef SIGHUP 108 signal(SIGHUP, poked); 109 #endif 110 signal(SIGINT, poked); 111 #ifdef SIGQUIT 112 signal(SIGQUIT, poked); 113 #endif 114 signal(SIGTERM, poked); 115 #endif /* HAVE_SIGNAL_H */ 116 117 /* Show the list of available drivers */ 118 SDL_Log("Available audio drivers:"); 119 for (i = 0; i < SDL_GetNumAudioDrivers(); ++i) { 120 SDL_Log("%i: %s", i, SDL_GetAudioDriver(i)); 121 } 122 123 /* Initialize fillerup() variables */ 124 if (SDL_OpenAudio(&wave.spec, NULL) < 0) { 125 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't open audio: %s\n", SDL_GetError()); 126 SDL_FreeWAV(wave.sound); 127 quit(2); 128 } 129 130 SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver()); 131 132 /* Let the audio run */ 133 SDL_PauseAudio(0); 134 while (!done && (SDL_GetAudioStatus() == SDL_AUDIO_PLAYING)) 135 SDL_Delay(1000); 136 137 /* Clean up on signal */ 138 SDL_CloseAudio(); 139 SDL_FreeWAV(wave.sound); 140 SDL_Quit(); 141 return (0); 142 } 143 144 /* vi: set ts=4 sw=4 expandtab: */ 145
