int mixer_sh_start(void)
{
struct mixer_channel_data *channel;
int i;
/* reset all channels to their defaults */
memset(&mixer_channel, 0, sizeof(mixer_channel));
for (i = 0, channel = mixer_channel; i < MIXER_MAX_CHANNELS; i++, channel++)
{
channel->mixing_level = 0xff;
channel->default_mixing_level = 0xff;
channel->config_mixing_level = config_mixing_level[i];
channel->config_default_mixing_level = config_default_mixing_level[i];
}
/* determine if we're playing in stereo or not */
first_free_channel = 0;
is_stereo = ((Machine->drv->sound_attributes & SOUND_SUPPORTS_STEREO) != 0);
/* clear the accumulators */
accum_base = 0;
memset(left_accum, 0, ACCUMULATOR_SAMPLES * sizeof(INT32));
memset(right_accum, 0, ACCUMULATOR_SAMPLES * sizeof(INT32));
samples_this_frame = osd_start_audio_stream(is_stereo);
mixer_sound_enabled = 1;
return 0;
}
int sound_init(running_machine *machine)
{
/* handle -nosound */
nosound_mode = (Machine->sample_rate == 0);
if (nosound_mode)
Machine->sample_rate = 11025;
/* count the speakers */
for (totalspeakers = 0; Machine->drv->speaker[totalspeakers].tag; totalspeakers++) ;
VPRINTF(("total speakers = %d\n", totalspeakers));
/* initialize the OSD layer */
VPRINTF(("osd_start_audio_stream\n"));
samples_this_frame = osd_start_audio_stream(1);
if (!samples_this_frame)
return 1;
/* allocate memory for mix buffers */
leftmix = auto_malloc(Machine->sample_rate * sizeof(*leftmix));
rightmix = auto_malloc(Machine->sample_rate * sizeof(*rightmix));
finalmix = auto_malloc(Machine->sample_rate * sizeof(*finalmix));
/* allocate a global timer for sound timing */
sound_update_timer = mame_timer_alloc(NULL);
/* initialize the streams engine */
VPRINTF(("streams_init\n"));
streams_init();
/* now start up the sound chips and tag their streams */
VPRINTF(("start_sound_chips\n"));
if (start_sound_chips())
return 1;
/* then create all the speakers */
VPRINTF(("start_speakers\n"));
if (start_speakers())
return 1;
/* finally, do all the routing */
VPRINTF(("route_sound\n"));
if (route_sound())
return 1;
if (MAKE_WAVS)
wavfile = wav_open("finalmix.wav", Machine->sample_rate, 2);
/* enable sound by default */
global_sound_enabled = TRUE;
/* register callbacks */
config_register("mixer", sound_load, sound_save);
add_pause_callback(machine, sound_pause);
add_reset_callback(machine, sound_reset);
add_exit_callback(machine, sound_exit);
return 0;
}
