int opl3class::fm_init(unsigned int rate) {
OPL3_Reset(&chip, rate);
memset(command,0,sizeof(command));
memset(time, 0, sizeof(time));
memset(samples, 0, sizeof(samples));
counter = 0;
lastwrite = 0;
strpos = 0;
endpos = 0;
resampler = resampler_create();
if (!resampler) return 0;
resampler_set_rate(resampler, 49716.0 / (double)rate);
return 1;
}
static int OPL_SDL_Init(unsigned int port_base)
{
// Check if SDL_mixer has been opened already
// If not, we must initialize it now
if (!SDLIsInitialized())
{
if (SDL_Init(SDL_INIT_AUDIO) < 0)
{
fprintf(stderr, "Unable to set up sound.\n");
return 0;
}
if (Mix_OpenAudio(opl_sample_rate, AUDIO_S16SYS, 2, GetSliceSize()) < 0)
{
fprintf(stderr, "Error initialising SDL_mixer: %s\n", Mix_GetError());
SDL_QuitSubSystem(SDL_INIT_AUDIO);
return 0;
}
SDL_PauseAudio(0);
// When this module shuts down, it has the responsibility to
// shut down SDL.
sdl_was_initialized = 1;
}
else
{
sdl_was_initialized = 0;
}
opl_sdl_paused = 0;
pause_offset = 0;
// Queue structure of callbacks to invoke.
callback_queue = OPL_Queue_Create();
current_time = 0;
// Get the mixer frequency, format and number of channels.
Mix_QuerySpec(&mixing_freq, &mixing_format, &mixing_channels);
// Only supports AUDIO_S16SYS
if (mixing_format != AUDIO_S16SYS || mixing_channels != 2)
{
fprintf(stderr,
"OPL_SDL only supports native signed 16-bit LSB, "
"stereo format!\n");
OPL_SDL_Shutdown();
return 0;
}
// Mix buffer:
mix_buffer = malloc(mixing_freq * sizeof(uint32_t) * 2);
// Create the emulator structure:
OPL3_Reset(&opl_chip, mixing_freq);
opl_opl3mode = 0;
callback_mutex = SDL_CreateMutex();
callback_queue_mutex = SDL_CreateMutex();
// TODO: This should be music callback? or-?
Mix_HookMusic(OPL_Mix_Callback, NULL);
return 1;
}