const char *SoundDriver_Allegro::Start(const char * const *parm)
{
if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) {
DEBUG(driver, 0, "allegro: install_allegro failed '%s'", allegro_error);
return "Failed to set up Allegro";
}
_allegro_instance_count++;
/* Initialise the sound */
if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, NULL) != 0) {
DEBUG(driver, 0, "allegro: install_sound failed '%s'", allegro_error);
return "Failed to set up Allegro sound";
}
/* Okay, there's no soundcard */
if (digi_card == DIGI_NONE) {
DEBUG(driver, 0, "allegro: no sound card found");
return "No sound card found";
}
int hz = GetDriverParamInt(parm, "hz", 44100);
_buffer_size = GetDriverParamInt(parm, "samples", 1024) * hz / 11025;
_stream = play_audio_stream(_buffer_size, 16, true, hz, 255, 128);
MxInitialize(hz);
return NULL;
}
const char *SoundDriver_Win32::Start(const char * const *parm)
{
WAVEFORMATEX wfex;
wfex.wFormatTag = WAVE_FORMAT_PCM;
wfex.nChannels = 2;
wfex.wBitsPerSample = 16;
wfex.nSamplesPerSec = GetDriverParamInt(parm, "hz", 44100);
wfex.nBlockAlign = (wfex.nChannels * wfex.wBitsPerSample) / 8;
wfex.nAvgBytesPerSec = wfex.nSamplesPerSec * wfex.nBlockAlign;
/* Limit buffer size to prevent overflows. */
_bufsize = GetDriverParamInt(parm, "bufsize", (GB(GetVersion(), 0, 8) > 5) ? 8192 : 4096);
_bufsize = min(_bufsize, UINT16_MAX);
try {
if (NULL == (_event = CreateEvent(NULL, FALSE, FALSE, NULL))) throw "Failed to create event";
if (waveOutOpen(&_waveout, WAVE_MAPPER, &wfex, (DWORD_PTR)_event, 0, CALLBACK_EVENT) != MMSYSERR_NOERROR) throw "waveOutOpen failed";
MxInitialize(wfex.nSamplesPerSec);
PrepareHeader(&_wave_hdr[0]);
PrepareHeader(&_wave_hdr[1]);
if (NULL == (_thread = CreateThread(NULL, 8192, SoundThread, 0, 0, &_threadId))) throw "Failed to create thread";
} catch (const char *error) {
this->Stop();
return error;
}
return NULL;
}
const char *SoundDriver_SDL::Start(const char * const *parm)
{
SDL_AudioSpec spec;
const char *s = SdlOpen(SDL_INIT_AUDIO);
if (s != NULL) return s;
spec.freq = GetDriverParamInt(parm, "hz", 44100);
spec.format = AUDIO_S16SYS;
spec.channels = 2;
spec.samples = 512;
spec.callback = fill_sound_buffer;
MxInitialize(spec.freq);
SDL_CALL SDL_OpenAudio(&spec, &spec);
SDL_CALL SDL_PauseAudio(0);
return NULL;
}
const char *SoundDriver_Allegro::Start(const char * const *parm)
{
if (_allegro_instance_count == 0 && install_allegro(SYSTEM_AUTODETECT, &errno, NULL)) {
DEBUG(driver, 0, "allegro: install_allegro failed '%s'", allegro_error);
return "Failed to set up Allegro";
}
_allegro_instance_count++;
/* Initialise the sound */
if (install_sound(DIGI_AUTODETECT, MIDI_AUTODETECT, NULL) != 0) {
DEBUG(driver, 0, "allegro: install_sound failed '%s'", allegro_error);
return "Failed to set up Allegro sound";
}
/* Okay, there's no soundcard */
if (digi_card == DIGI_NONE) {
DEBUG(driver, 0, "allegro: no sound card found");
return "No sound card found";
}
_stream = play_audio_stream(BUFFER_SIZE, 16, true, 44100, 255, 128);
MxInitialize(44100);
return NULL;
}