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/* $Id$ */
/** @file allegro_s.cpp Playing sound via Allegro. */
#ifdef WITH_ALLEGRO
#include "../stdafx.h"
#include "../driver.h"
#include "../mixer.h"
#include "../sdl.h"
#include "../debug.h"
#include "allegro_s.h"
#include <allegro.h>
static FSoundDriver_Allegro iFSoundDriver_Allegro;
/** The stream we are writing too */
static AUDIOSTREAM *_stream = NULL;
/** The number of samples in the buffer */
static const int BUFFER_SIZE = 512;
void SoundDriver_Allegro::MainLoop()
{
/* We haven't opened a stream yet */
if (_stream == NULL) return;
void *data = get_audio_stream_buffer(_stream);
/* We don't have to fill the stream yet */
if (data == NULL) return;
/* Mix the samples */
MxMixSamples(data, BUFFER_SIZE);
/* Allegro sound is always unsigned, so we need to correct that */
uint16 *snd = (uint16*)data;
for (int i = 0; i < BUFFER_SIZE * 2; i++) snd[i] ^= 0x8000;
/* Tell we've filled the stream */
free_audio_stream_buffer(_stream);
}
/** There are multiple modules that might be using Allegro and
* Allegro can only be initiated once. */
extern int _allegro_instance_count;
const char *SoundDriver_Allegro::Start(const char * const *parm)
{
if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) return NULL;
_allegro_instance_count++;
/* Initialise the sound */
if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, NULL) != 0) return NULL;
/* Okay, there's no soundcard */
if (digi_card == DIGI_NONE) {
DEBUG(driver, 0, "allegro: no sound card found");
return NULL;
}
_stream = play_audio_stream(BUFFER_SIZE, 16, true, 11025, 255, 128);
return NULL;
}
void SoundDriver_Allegro::Stop()
{
if (_stream != NULL) {
stop_audio_stream(_stream);
_stream = NULL;
}
remove_sound();
if (--_allegro_instance_count == 0) allegro_exit();
}
#endif /* WITH_ALLEGRO */
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