void *ay8910_start_ym(sound_type chip_type, int sndindex, int clock, const struct AY8910interface *intf)
{
ay8910_context *info;
info = auto_malloc(sizeof(*info));
memset(info, 0, sizeof(*info));
info->index = sndindex;
info->intf = intf;
if ((info->intf->flags & AY8910_SINGLE_OUTPUT) != 0)
{
logerror("AY-3-8910/YM2149 using single output!\n");
info->streams = 1;
}
else
info->streams = 3;
switch (chip_type)
{
case SOUND_AY8910:
case SOUND_AY8930:
info->step = 2;
info->par = &ay8910_param;
info->par_env = &ay8910_param;
info->zero_is_off = 1;
info->env_step_mask = 0x0F;
break;
case SOUND_YM2149:
case SOUND_YM2203:
case SOUND_YM2610:
case SOUND_YM2610B:
case SOUND_YM2608:
case SOUND_YMZ284:
case SOUND_YMZ294:
case SOUND_YM3439:
default:
info->step = 1;
info->par = &ym2149_param;
info->par_env = &ym2149_param_env;
info->zero_is_off = 0;
info->env_step_mask = 0x1F;
break;
}
build_mixer_table(info);
/* The envelope is pacing twice as fast for the YM2149 as for the AY-3-8910, */
/* This handled by the step parameter. Consequently we use a divider of 8 here. */
info->channel = stream_create(0,info->streams,clock / 8 ,info,ay8910_update);
ay8910_set_clock_ym(info,clock);
ay8910_statesave(info, sndindex);
return info;
}
static void psg_set_clock(void *param, int clock)
{
ym2610_state *info = (ym2610_state *)param;
if (info->psg != NULL)
{
switch(info->AY_EMU_CORE)
{
#ifdef ENABLE_ALL_CORES
case EC_MAME:
ay8910_set_clock_ym(info->psg, clock);
break;
#endif
case EC_EMU2149:
PSG_set_clock((PSG*)info->psg, clock);
break;
}
}
}
static void AY8910_init(struct AY8910 *PSG, int streams,
int clock,int sample_rate,
read8_handler portAread,read8_handler portBread,
write8_handler portAwrite,write8_handler portBwrite)
{
PSG->PortAread = portAread;
PSG->PortBread = portBread;
PSG->PortAwrite = portAwrite;
PSG->PortBwrite = portBwrite;
/* the step clock for the tone and noise generators is the chip clock */
/* divided by 8; for the envelope generator of the AY-3-8910, it is half */
/* that much (clock/16), but the envelope of the YM2149 goes twice as */
/* fast, therefore again clock/8. */
PSG->Channel = stream_create(0,streams,clock/8,PSG,AY8910Update);
ay8910_set_clock_ym(PSG,clock);
}
static void psg_set_clock(void *param, int clock)
{
struct ym2610_info *info = param;
ay8910_set_clock_ym(info->psg, clock);
}
static void psg_set_clock(void *param, int clock)
{
ym2608_device *ym2608 = (ym2608_device *) param;
ay8910_set_clock_ym(ym2608->_psg(), clock);
}
static void psg_set_clock(void *param, int clock)
{
ym2610_state *info = (ym2610_state *)param;
ay8910_set_clock_ym(info->psg, clock);
}