ref: 02000143d13cad951165426c47bf93590781f8af
dir: /pcsound/pcsound_win32.c/
// // Copyright(C) 2005-2014 Simon Howard // // This program is free software; you can redistribute it and/or // modify it under the terms of the GNU General Public License // as published by the Free Software Foundation; either version 2 // of the License, or (at your option) any later version. // // This program is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // // DESCRIPTION: // PC speaker interface. // #ifdef _WIN32 #include "SDL.h" #include "SDL_thread.h" #include <windows.h> #include "pcsound.h" #include "pcsound_internal.h" static SDL_Thread *sound_thread_handle; static int sound_thread_running; static pcsound_callback_func callback; static int SoundThread(void *unused) { int frequency; int duration; while (sound_thread_running) { callback(&duration, &frequency); if (frequency != 0) { Beep(frequency, duration); } else { Sleep(duration); } } return 0; } static int PCSound_Win32_Init(pcsound_callback_func callback_func) { OSVERSIONINFO osvi; BOOL result; // Temporarily disabled - the Windows scheduler is strange and // stupid. return 0; // Find the OS version osvi.dwOSVersionInfoSize = sizeof(osvi); result = GetVersionEx(&osvi); if (!result) { return 0; } // Beep() ignores its arguments on win9x, so this driver will // not work there. if (osvi.dwPlatformId != VER_PLATFORM_WIN32_NT) { return 0; } // Start a thread to play sound. callback = callback_func; sound_thread_running = 1; sound_thread_handle = SDL_CreateThread(SoundThread, "PC speaker thread", NULL); return 1; } static void PCSound_Win32_Shutdown(void) { sound_thread_running = 0; SDL_WaitThread(sound_thread_handle, NULL); } pcsound_driver_t pcsound_win32_driver = { "Windows", PCSound_Win32_Init, PCSound_Win32_Shutdown, }; #endif /* #ifdef _WIN32 */