/* Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely. */ #include "SDL.h" #include <stdio.h> /* for fflush() and stdout */ #ifdef __EMSCRIPTEN__ #include <emscripten/emscripten.h> #endif static SDL_AudioSpec spec; static Uint8 *sound = NULL; /* Pointer to wave data */ static Uint32 soundlen = 0; /* Length of wave data */ typedef struct { SDL_AudioDeviceID dev; int soundpos; SDL_atomic_t done; } callback_data; callback_data cbd[64]; void SDLCALL play_through_once(void *arg, Uint8 * stream, int len) { callback_data *cbd = (callback_data *) arg; Uint8 *waveptr = sound + cbd->soundpos; int waveleft = soundlen - cbd->soundpos; int cpy = len; if (cpy > waveleft) cpy = waveleft; SDL_memcpy(stream, waveptr, cpy); len -= cpy; cbd->soundpos += cpy; if (len > 0) { stream += cpy; SDL_memset(stream, spec.silence, len); SDL_AtomicSet(&cbd->done, 1); } } void loop() { if (SDL_AtomicGet(&cbd[0].done)) { #ifdef __EMSCRIPTEN__ emscripten_cancel_main_loop(); #endif SDL_PauseAudioDevice(cbd[0].dev, 1); SDL_CloseAudioDevice(cbd[0].dev); SDL_FreeWAV(sound); SDL_Quit(); } } static void test_multi_audio(int devcount) { int keep_going = 1; int i; #ifdef __ANDROID__ SDL_Event event; /* Create a Window to get fully initialized event processing for testing pause on Android. */ SDL_CreateWindow("testmultiaudio", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 320, 240, 0); #endif if (devcount > 64) { SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Too many devices (%d), clamping to 64...\n", devcount); devcount = 64; } spec.callback = play_through_once; for (i = 0; i < devcount; i++) { const char *devname = SDL_GetAudioDeviceName(i, 0); SDL_Log("playing on device #%d: ('%s')...", i, devname); fflush(stdout); SDL_memset(&cbd[0], '\0', sizeof(callback_data)); spec.userdata = &cbd[0]; cbd[0].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0); if (cbd[0].dev == 0) { SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device failed: %s\n", SDL_GetError()); } else { SDL_PauseAudioDevice(cbd[0].dev, 0); #ifdef __EMSCRIPTEN__ emscripten_set_main_loop(loop, 0, 1); #else while (!SDL_AtomicGet(&cbd[0].done)) { #ifdef __ANDROID__ /* Empty queue, some application events would prevent pause. */ while (SDL_PollEvent(&event)){} #endif SDL_Delay(100); } SDL_PauseAudioDevice(cbd[0].dev, 1); #endif SDL_Log("done.\n"); SDL_CloseAudioDevice(cbd[0].dev); } } SDL_memset(cbd, '\0', sizeof(cbd)); SDL_Log("playing on all devices...\n"); for (i = 0; i < devcount; i++) { const char *devname = SDL_GetAudioDeviceName(i, 0); spec.userdata = &cbd[i]; cbd[i].dev = SDL_OpenAudioDevice(devname, 0, &spec, NULL, 0); if (cbd[i].dev == 0) { SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Open device %d failed: %s\n", i, SDL_GetError()); } } for (i = 0; i < devcount; i++) { if (cbd[i].dev) { SDL_PauseAudioDevice(cbd[i].dev, 0); } } while (keep_going) { keep_going = 0; for (i = 0; i < devcount; i++) { if ((cbd[i].dev) && (!SDL_AtomicGet(&cbd[i].done))) { keep_going = 1; } } #ifdef __ANDROID__ /* Empty queue, some application events would prevent pause. */ while (SDL_PollEvent(&event)){} #endif SDL_Delay(100); } #ifndef __EMSCRIPTEN__ for (i = 0; i < devcount; i++) { if (cbd[i].dev) { SDL_PauseAudioDevice(cbd[i].dev, 1); SDL_CloseAudioDevice(cbd[i].dev); } } SDL_Log("All done!\n"); #endif } int main(int argc, char **argv) { int devcount = 0; /* Enable standard application logging */ SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO); /* Load the SDL library */ if (SDL_Init(SDL_INIT_AUDIO) < 0) { SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError()); return (1); } SDL_Log("Using audio driver: %s\n", SDL_GetCurrentAudioDriver()); devcount = SDL_GetNumAudioDevices(0); if (devcount < 1) { SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Don't see any specific audio devices!\n"); } else { if (argv[1] == NULL) { argv[1] = "sample.wav"; } /* Load the wave file into memory */ if (SDL_LoadWAV(argv[1], &spec, &sound, &soundlen) == NULL) { SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s\n", argv[1], SDL_GetError()); } else { test_multi_audio(devcount); SDL_FreeWAV(sound); } } SDL_Quit(); return 0; }