OpenTTD: src/sound/sdl_s.cpp Source File

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sdl_s.cpp
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1 /* $Id: sdl_s.cpp 26482 2014-04-23 20:13:33Z rubidium $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * 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.
6 * 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.
7 * 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/>.
8 */
9
12 #ifdef WITH_SDL
13
14 #include "../stdafx.h"
15
16 #include "../mixer.h"
17 #include "../sdl.h"
18 #include "sdl_s.h"
19 #include <SDL.h>
20
21 #include "../safeguards.h"
22
24 static FSoundDriver_SDL iFSoundDriver_SDL;
25
32 static void CDECL fill_sound_buffer(void *userdata, Uint8 *stream, int len)
33 {
34 MxMixSamples(stream, len / 4);
35 }
36
37 const char *SoundDriver_SDL::Start(const char * const *parm)
38 {
39 SDL_AudioSpec spec;
40
41 const char *s = SdlOpen(SDL_INIT_AUDIO);
42 if (s != NULL) return s;
43
44 spec.freq = GetDriverParamInt(parm, "hz", 44100);
45 spec.format = AUDIO_S16SYS;
46 spec.channels = 2;
47 spec.samples = GetDriverParamInt(parm, "samples", 1024);
48 spec.callback = fill_sound_buffer;
49 MxInitialize(spec.freq);
50 SDL_CALL SDL_OpenAudio(&spec, &spec);
51 SDL_CALL SDL_PauseAudio(0);
52 return NULL;
53 }
54
55 void SoundDriver_SDL::Stop()
56 {
57 SDL_CALL SDL_CloseAudio();
58 SdlClose(SDL_INIT_AUDIO);
59 }
60
61 #endif /* WITH_SDL */