allegro_s.cpp
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00002
00005 #ifdef WITH_ALLEGRO
00006
00007 #include "../stdafx.h"
00008
00009 #include "../driver.h"
00010 #include "../mixer.h"
00011 #include "../sdl.h"
00012 #include "../debug.h"
00013 #include "allegro_s.h"
00014 #include <allegro.h>
00015
00016 static FSoundDriver_Allegro iFSoundDriver_Allegro;
00018 static AUDIOSTREAM *_stream = NULL;
00020 static const int BUFFER_SIZE = 512;
00021
00022 void SoundDriver_Allegro::MainLoop()
00023 {
00024
00025 if (_stream == NULL) return;
00026
00027 void *data = get_audio_stream_buffer(_stream);
00028
00029 if (data == NULL) return;
00030
00031
00032 MxMixSamples(data, BUFFER_SIZE);
00033
00034
00035 uint16 *snd = (uint16*)data;
00036 for (int i = 0; i < BUFFER_SIZE * 2; i++) snd[i] ^= 0x8000;
00037
00038
00039 free_audio_stream_buffer(_stream);
00040 }
00041
00044 extern int _allegro_instance_count;
00045
00046 const char *SoundDriver_Allegro::Start(const char * const *parm)
00047 {
00048 if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) return "Failed to set up Allegro";
00049 _allegro_instance_count++;
00050
00051
00052 if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, NULL) != 0) return "Failed to set up Allegro sound";
00053
00054
00055 if (digi_card == DIGI_NONE) {
00056 DEBUG(driver, 0, "allegro: no sound card found");
00057 return "No sound card found";
00058 }
00059
00060 _stream = play_audio_stream(BUFFER_SIZE, 16, true, 11025, 255, 128);
00061 MxInitialize(11025);
00062 return NULL;
00063 }
00064
00065 void SoundDriver_Allegro::Stop()
00066 {
00067 if (_stream != NULL) {
00068 stop_audio_stream(_stream);
00069 _stream = NULL;
00070 }
00071 remove_sound();
00072
00073 if (--_allegro_instance_count == 0) allegro_exit();
00074 }
00075
00076 #endif