static int AY8910_init(const char *chip_name,int chip,
int clock,int volume,int sample_rate,
mem_read_handler portAread,mem_read_handler portBread,
mem_write_handler portAwrite,mem_write_handler portBwrite)
{
struct AY8910 *PSG = &AYPSG[chip];
int i;
#ifdef SINGLE_CHANNEL_MIXER
char buf[40];
int gain = MIXER_GET_GAIN(volume);
int pan = MIXER_GET_PAN(volume);
#else
char buf[3][40];
const char *name[3];
int vol[3];
#endif
/* 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. */
// causes crashes with YM2610 games - overflow?
// if (options.use_filter)
sample_rate = clock/8;
memset(PSG,0,sizeof(struct AY8910));
PSG->PortAread = portAread;
PSG->PortBread = portBread;
PSG->PortAwrite = portAwrite;
PSG->PortBwrite = portBwrite;
#ifdef SINGLE_CHANNEL_MIXER
for (i = 0;i < 3;i++)
PSG->mix_vol[i] = MIXER_GET_LEVEL(volume);
sprintf(buf,"%s #%d",chip_name,chip);
PSG->Channel = stream_init(buf,MIXERG(100,gain,pan),sample_rate,chip,AY8910Update);
#else
for (i = 0;i < 3;i++)
{
vol[i] = volume;
name[i] = buf[i];
sprintf(buf[i],"%s #%d Ch %c",chip_name,chip,'A'+i);
}
PSG->Channel = stream_init_multi(3,name,vol,sample_rate,chip,AY8910Update);
#endif
if (PSG->Channel == -1)
return 1;
return 0;
}
int mixer_allocate_channels(int channels, const int *default_mixing_levels)
{
int i, j;
/* make sure we didn't overrun the number of available channels */
if (first_free_channel + channels > MIXER_MAX_CHANNELS)
{
logerror("Too many mixer channels (requested %d, available %d)\n", first_free_channel + channels, MIXER_MAX_CHANNELS);
exit(1);
}
/* loop over channels requested */
for (i = 0; i < channels; i++)
{
struct mixer_channel_data *channel = &mixer_channel[first_free_channel + i];
/* extract the basic data */
channel->default_mixing_level = MIXER_GET_LEVEL(default_mixing_levels[i]);
channel->pan = MIXER_GET_PAN(default_mixing_levels[i]);
channel->gain = MIXER_GET_GAIN(default_mixing_levels[i]);
channel->volume = 100;
/* backwards compatibility with old 0-255 volume range */
if (channel->default_mixing_level > 100)
channel->default_mixing_level = channel->default_mixing_level * 25 / 255;
/* attempt to load in the configuration data for this channel */
channel->mixing_level = channel->default_mixing_level;
if (!config_invalid)
{
/* if the defaults match, set the mixing level from the config */
if (channel->default_mixing_level == channel->config_default_mixing_level)
channel->mixing_level = channel->config_mixing_level;
/* otherwise, invalidate all channels that have been created so far */
else
{
config_invalid = 1;
for (j = 0; j < first_free_channel + i; j++)
mixer_set_mixing_level(j, mixer_channel[j].default_mixing_level);
}
}
/* set the default name */
mixer_set_name(first_free_channel + i, 0);
}
/* increment the counter and return the first one */
first_free_channel += channels;
return first_free_channel - channels;
}