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