mirror of https://github.com/OpenTTD/OpenTTD.git
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file sdl2_s.cpp Playing sound via SDL2. */
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#ifdef WITH_SDL2
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#include "../stdafx.h"
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#include "../mixer.h"
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#include "sdl_s.h"
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#include <SDL.h>
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#include "../safeguards.h"
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/** Factory for the SDL sound driver. */
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static FSoundDriver_SDL iFSoundDriver_SDL;
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/**
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* Callback that fills the sound buffer.
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* @param stream The stream to put data into.
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* @param len The length of the stream in bytes.
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*/
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static void CDECL fill_sound_buffer(void *, Uint8 *stream, int len)
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{
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MxMixSamples(stream, len / 4);
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}
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std::optional<std::string_view> SoundDriver_SDL::Start(const StringList &parm)
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{
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SDL_AudioSpec spec;
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SDL_AudioSpec spec_actual;
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/* Only initialise SDL if the video driver hasn't done it already */
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int ret_code = 0;
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if (SDL_WasInit(SDL_INIT_EVERYTHING) == 0) {
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ret_code = SDL_Init(SDL_INIT_AUDIO);
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} else if (SDL_WasInit(SDL_INIT_AUDIO) == 0) {
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ret_code = SDL_InitSubSystem(SDL_INIT_AUDIO);
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}
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if (ret_code == -1) return SDL_GetError();
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spec.freq = GetDriverParamInt(parm, "hz", 44100);
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spec.format = AUDIO_S16SYS;
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spec.channels = 2;
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spec.samples = GetDriverParamInt(parm, "samples", 1024);
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spec.callback = fill_sound_buffer;
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SDL_AudioDeviceID dev = SDL_OpenAudioDevice(nullptr, 0, &spec, &spec_actual, SDL_AUDIO_ALLOW_FREQUENCY_CHANGE);
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MxInitialize(spec_actual.freq);
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SDL_PauseAudioDevice(dev, 0);
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return std::nullopt;
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}
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void SoundDriver_SDL::Stop()
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{
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SDL_CloseAudio();
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SDL_QuitSubSystem(SDL_INIT_AUDIO);
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if (SDL_WasInit(SDL_INIT_EVERYTHING) == 0) {
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SDL_Quit(); // If there's nothing left, quit SDL
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}
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}
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#endif /* WITH_SDL2 */
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