You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
16 years ago
|
/* $Id$ */
|
||
|
|
||
|
/** @file allegro_s.cpp Playing sound via Allegro. */
|
||
|
|
||
|
#ifdef WITH_ALLEGRO
|
||
|
|
||
|
#include "../stdafx.h"
|
||
|
|
||
|
#include "../driver.h"
|
||
|
#include "../mixer.h"
|
||
|
#include "../sdl.h"
|
||
|
#include "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_count;
|
||
|
|
||
|
const char *SoundDriver_Allegro::Start(const char * const *parm)
|
||
|
{
|
||
|
if (_allegro_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) return NULL;
|
||
|
_allegro_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_count == 0) allegro_exit();
|
||
|
}
|
||
|
|
||
|
#endif /* WITH_ALLEGRO */
|