cpp/openttd-patchpack/source Files · src/sound/sdl_s.cpp

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Location: cpp/openttd-patchpack/source/src/sound/sdl_s.cpp

r25827:5a9ded1a0c1a 2.0 KiB text/x-c Show Annotation Show as Raw Download as Raw

Patric Stout

Feature: allow the use of STUN to connect client and server together

This method doesn't require port-forwarding to be used, and works for
most common NAT routers in home setups. But, for sure it doesn't work
for all setups, and not everyone will be able to use this.

/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */

/** @file sdl_s.cpp Playing sound via SDL. */

#ifdef WITH_SDL

#include "../stdafx.h"

#include "../mixer.h"
#include "sdl_s.h"
#include <SDL.h>

#include "../safeguards.h"

/** Factory for the SDL sound driver. */
static FSoundDriver_SDL iFSoundDriver_SDL;

/**
 * Callback that fills the sound buffer.
 * @param userdata Ignored.
 * @param stream   The stream to put data into.
 * @param len      The length of the stream in bytes.
 */
static void CDECL fill_sound_buffer(void *userdata, Uint8 *stream, int len)
{
	MxMixSamples(stream, len / 4);
}

const char *SoundDriver_SDL::Start(const StringList &parm)
{
	SDL_AudioSpec spec;

	/* Only initialise SDL if the video driver hasn't done it already */
	int ret_code = 0;
	if (SDL_WasInit(SDL_INIT_EVERYTHING) == 0) {
		ret_code = SDL_Init(SDL_INIT_AUDIO | SDL_INIT_NOPARACHUTE);
	} else if (SDL_WasInit(SDL_INIT_AUDIO) == 0) {
		ret_code = SDL_InitSubSystem(SDL_INIT_AUDIO);
	}
	if (ret_code == -1) return SDL_GetError();

	spec.freq = GetDriverParamInt(parm, "hz", 44100);
	spec.format = AUDIO_S16SYS;
	spec.channels = 2;
	spec.samples = GetDriverParamInt(parm, "samples", 1024);
	spec.callback = fill_sound_buffer;
	MxInitialize(spec.freq);
	SDL_OpenAudio(&spec, &spec);
	SDL_PauseAudio(0);
	return nullptr;
}

void SoundDriver_SDL::Stop()
{
	SDL_CloseAudio();
	SDL_QuitSubSystem(SDL_INIT_AUDIO);
	if (SDL_WasInit(SDL_INIT_EVERYTHING) == 0) {
		SDL_Quit(); // If there's nothing left, quit SDL
	}
}

#endif /* WITH_SDL */