snes9x/gtk/src/gtk_sound_driver_sdl.cpp

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#include "gtk_s9x.h"
#include "gtk_sound_driver_sdl.h"
static void
sdl_audio_callback (void *userdata, Uint8 *stream, int len)
{
((S9xSDLSoundDriver *) userdata)->mix ((unsigned char *) stream, len);
}
static void
samples_available (void *data)
{
SDL_LockAudio ();
S9xFinalizeSamples ();
SDL_UnlockAudio ();
}
void
S9xSDLSoundDriver::mix (unsigned char *output, int bytes)
{
SDL_LockAudio ();
S9xMixSamples (output, bytes >> (Settings.SixteenBitSound ? 1 : 0));
SDL_UnlockAudio ();
}
S9xSDLSoundDriver::S9xSDLSoundDriver ()
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{
audiospec = NULL;
}
void
S9xSDLSoundDriver::init ()
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{
SDL_InitSubSystem (SDL_INIT_AUDIO);
stop ();
}
void
S9xSDLSoundDriver::terminate ()
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{
stop ();
if (audiospec)
{
SDL_CloseAudio ();
free (audiospec);
audiospec = NULL;
}
SDL_QuitSubSystem (SDL_INIT_AUDIO);
}
void
S9xSDLSoundDriver::start ()
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{
if (!gui_config->mute_sound)
{
if (audiospec)
{
SDL_PauseAudio (0);
}
}
}
void
S9xSDLSoundDriver::stop ()
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{
if (audiospec)
{
SDL_PauseAudio (1);
}
}
bool8
S9xSDLSoundDriver::open_device ()
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{
audiospec = (SDL_AudioSpec *) malloc (sizeof (SDL_AudioSpec));
audiospec->freq = Settings.SoundPlaybackRate;
audiospec->channels = Settings.Stereo ? 2 : 1;
audiospec->format = Settings.SixteenBitSound ? AUDIO_S16SYS : AUDIO_U8;
audiospec->samples = (gui_config->sound_buffer_size * audiospec->freq / 1000) >> 1;
audiospec->callback = sdl_audio_callback;
audiospec->userdata = this;
printf ("SDL sound driver initializing...\n");
printf (" --> (Frequency: %dhz, Latency: %dms)...",
audiospec->freq,
(audiospec->samples * 1000 / audiospec->freq) << 1);
if (SDL_OpenAudio (audiospec, NULL) < 0)
{
printf ("Failed\n");
free (audiospec);
audiospec = NULL;
return FALSE;
}
printf ("OK\n");
S9xSetSamplesAvailableCallback (samples_available, NULL);
return TRUE;
}