sdl_s.cpp

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00001 /* $Id: sdl_s.cpp 18820 2010-01-15 23:45:26Z rubidium $ */
00002 
00003 /*
00004  * This file is part of OpenTTD.
00005  * OpenTTD 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, version 2.
00006  * OpenTTD 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.
00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
00008  */
00009 
00012 #ifdef WITH_SDL
00013 
00014 #include "../stdafx.h"
00015 
00016 #include "../mixer.h"
00017 #include "../sdl.h"
00018 #include "sdl_s.h"
00019 #include <SDL.h>
00020 
00021 static FSoundDriver_SDL iFSoundDriver_SDL;
00022 
00023 static void CDECL fill_sound_buffer(void *userdata, Uint8 *stream, int len)
00024 {
00025   MxMixSamples(stream, len / 4);
00026 }
00027 
00028 const char *SoundDriver_SDL::Start(const char * const *parm)
00029 {
00030   SDL_AudioSpec spec;
00031 
00032   const char *s = SdlOpen(SDL_INIT_AUDIO);
00033   if (s != NULL) return s;
00034 
00035   spec.freq = GetDriverParamInt(parm, "hz", 44100);
00036   spec.format = AUDIO_S16SYS;
00037   spec.channels = 2;
00038   spec.samples = GetDriverParamInt(parm, "samples", 1024);
00039   spec.callback = fill_sound_buffer;
00040   MxInitialize(spec.freq);
00041   SDL_CALL SDL_OpenAudio(&spec, &spec);
00042   SDL_CALL SDL_PauseAudio(0);
00043   return NULL;
00044 }
00045 
00046 void SoundDriver_SDL::Stop()
00047 {
00048   SDL_CALL SDL_CloseAudio();
00049   SdlClose(SDL_INIT_AUDIO);
00050 }
00051 
00052 #endif /* WITH_SDL */

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