sound/sdl.c


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#include "stdafx.h"
#include "openttd.h"
#include "driver.h"
#include "mixer.h"
#include "sdl.h"
#include "sound/sdl.h"
#include <SDL.h>

static void CDECL fill_sound_buffer(void *userdata, Uint8 *stream, int len)
{
	MxMixSamples(_mixer, stream, len / 4);
}

static const char *SdlSoundStart(const char * const *parm)
{
	SDL_AudioSpec spec;

	const char *s = SdlOpen(SDL_INIT_AUDIO);
	if (s != NULL) return s;

	spec.freq = GetDriverParamInt(parm, "hz", 11025);
	spec.format = AUDIO_S16SYS;
	spec.channels = 2;
	spec.samples = 512;
	spec.callback = fill_sound_buffer;
	SDL_CALL SDL_OpenAudio(&spec, &spec);
	SDL_CALL SDL_PauseAudio(0);
	return NULL;
}

static void SdlSoundStop(void)
{
	SDL_CALL SDL_CloseAudio();
	SdlClose(SDL_INIT_AUDIO);
}

const HalSoundDriver _sdl_sound_driver = {
	SdlSoundStart,
	SdlSoundStop,
};