void okim6376_device::device_start()
{
int voice;
compute_tables();
m_command[0] = -1;
m_command[1] = -1;
m_stage[0] = 0;
m_stage[1] = 0;
m_latch = 0;
m_master_clock = clock();
m_divisor = divisor_table[0];
m_nar = 1;
m_nartimer = 0;
m_busy = 1;
m_st = 1;
m_ch2 = 1;
m_st_update = 0;
m_ch2_update = 0;
m_st_pulses = 0;
/* generate the name and create the stream */
m_stream = machine().sound().stream_alloc(*this, 0, 1, clock() / m_divisor);
/* initialize the voices */
for (voice = 0; voice < OKIM6376_VOICES; voice++)
{
/* initialize the rest of the structure */
m_voice[voice].volume = 0;
reset_adpcm(&m_voice[voice]);
}
okim6376_state_save_register();
}
static void RenegadeADPCMInit(int clock)
{
struct renegade_adpcm_state *state = &renegade_adpcm;
state->playing = 0;
state->base = DrvADPCMRom;
reset_adpcm(&state->adpcm);
nUpdateStep = (int)(((float)clock / nBurnSoundRate) * 4096);
}
static void oki_process(okim6376_state *info, int channel, int command)
{
/* if a command is pending, process the second half */
if ((command != -1) && (command != 0)) //process silence separately
{
int start;
unsigned char *base/*, *base_end*/;
/* update the stream */
info->stream->update();
/* determine which voice(s) (voice is set by the state of 2CH) */
{
struct ADPCMVoice *voice = &info->voice[channel];
/* determine the start position, max address space is 16Mbit */
base = &info->region_base[info->command[channel] * 4];
//base_end = &info->region_base[(MAX_WORDS+1) * 4];
start = ((base[0] << 16) + (base[1] << 8) + base[2]) & 0x1fffff;
if (start == 0)
{
voice->playing = 0;
}
else
{
/* set up the voice to play this sample */
if (!voice->playing)
{
voice->playing = 1;
voice->base_offset = start;
voice->sample = 0;
voice->count = 0;
/* also reset the ADPCM parameters */
reset_adpcm(voice);
if (channel == 0)
{
/* We set channel 2's audio separately */
voice->volume = volume_table[0];
}
}
else
{
if (((info->nar)&&(channel == 0))||(channel == 1))//Store the request, for later processing (channel 2 ignores NAR)
{
info->stage[channel] = 1;
}
}
}
}
}
/* otherwise, see if this is a silence command */
else
{
/* update the stream, then turn it off */
info->stream->update();
if (command ==0)
{
int i;
for (i = 0; i < OKIM6376_VOICES; i++)
{
struct ADPCMVoice *voice = &info->voice[i];
voice->playing = 0;
}
}
}
}
