// license:BSD-3-Clause
// copyright-holders:R. Belmont
/*
c352.c - Namco C352 custom PCM chip emulation
v1.2
By R. Belmont
Additional code by cync and the hoot development team
Thanks to Cap of VivaNonno for info and The_Author for preliminary reverse-engineering
Chip specs:
32 voices
Supports 8-bit linear and 8-bit muLaw samples
Output: digital, 16 bit, 4 channels
Output sample rate is the input clock / (288 * 2).
superctr: The clock divider appears to be configurable for each system.
Below is a list of the divider values followed by the systems that use it.
* 228: System 11.
* 288: System 22, Super 22, NB-1/2, ND-1, FL.
* 296: System 23, Super 23.
* 332: System 12.
*/
#include "emu.h"
#include "c352.h"
#define VERBOSE (0)
#define LOG(x) do { if (VERBOSE) logerror x; } while (0)
// device type definition
const device_type C352 = &device_creator<c352_device>;
// default address map
static ADDRESS_MAP_START( c352, AS_0, 8, c352_device )
AM_RANGE(0x000000, 0xffffff) AM_ROM
ADDRESS_MAP_END
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// c352_device - constructor
//-------------------------------------------------
c352_device::c352_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, C352, "C352", tag, owner, clock, "c352", __FILE__),
device_sound_interface(mconfig, *this),
device_memory_interface(mconfig, *this),
m_space_config("samples", ENDIANNESS_LITTLE, 8, 24, 0, nullptr, *ADDRESS_MAP_NAME(c352))
{
}
//-------------------------------------------------
// static_set_dividder - configuration helper to
// set the divider setting
//-------------------------------------------------
void c352_device::static_set_divider(device_t &device, int setting)
{
c352_device &c352 = downcast<c352_device &>(device);
c352.m_divider = setting;
}
//-------------------------------------------------
// memory_space_config - return a description of
// any address spaces owned by this device
//-------------------------------------------------
const address_space_config *c352_device::memory_space_config(address_spacenum spacenum) const
{
return (spacenum == 0) ? &m_space_config : nullptr;
}
// noise generator
int c352_device::get_mseq_bit()
{
unsigned int mask = (1 << (7 - 1));
unsigned int reg = m_mseq_reg;
unsigned int bit = reg & (1 << (17 - 1));
if (bit)
{
reg = ((reg ^ mask) << 1) | 1;
}
else
{
reg = reg << 1;
}
m_mseq_reg = reg;
return (reg & 1);
}
void c352_device::mix_one_channel(unsigned long ch, long sample_count)
{
int i;
signed short sample, nextsample;
signed short noisebuf;
UINT16 noisecnt;
INT32 frequency, delta, offset, cnt, flag;
UINT32 bank;
UINT32 pos;
frequency = m_c352_ch[ch].pitch;
delta=frequency;
pos = m_c352_ch[ch].current_addr; // sample pointer
offset = m_c352_ch[ch].pos; // 16.16 fixed-point offset into the sample
flag = m_c352_ch[ch].flag;
bank = m_c352_ch[ch].bank << 16;
noisecnt = m_c352_ch[ch].noisecnt;
noisebuf = m_c352_ch[ch].noisebuf;
for(i = 0 ; (i < sample_count) && (flag & C352_FLG_BUSY) ; i++)
{
offset += delta;
cnt = (offset>>16)&0x7fff;
if (cnt) // if there is a whole sample part, chop it off now that it's been applied
{
offset &= 0xffff;
}
if (pos > 0x1000000)
{
m_c352_ch[ch].flag &= ~C352_FLG_BUSY;
return;
}
sample = (char)m_direct->read_byte(pos);
nextsample = (char)m_direct->read_byte(pos+cnt);
// sample is muLaw, not 8-bit linear (Fighting Layer uses this extensively)
if (flag & C352_FLG_MULAW)
{
sample = m_mulaw_table[(unsigned char)sample];
nextsample = m_mulaw_table[(unsigned char)nextsample];
}
else
{
sample <<= 8;
nextsample <<= 8;
}
// play noise instead of sample data
if (flag & C352_FLG_NOISE)
{
int noise_level = 0x8000;
sample = m_c352_ch[ch].noise = (m_c352_ch[ch].noise << 1) | get_mseq_bit();
sample = (sample & (noise_level - 1)) - (noise_level >> 1);
if (sample > 0x7f)
{
sample = 0x7f;
}
else if (sample < 0)
{
sample = 0xff;
}
sample = m_mulaw_table[(unsigned char)sample];
if ( (pos+cnt) == pos )
{
noisebuf += sample;
noisecnt++;
sample = noisebuf / noisecnt;
}
else
{
if ( noisecnt )
{
sample = noisebuf / noisecnt;
}
else
{
sample = m_mulaw_table[0x7f]; // Nearest sound(s) is here.
}
noisebuf = 0;
noisecnt = ( flag & C352_FLG_FILTER ) ? 0 : 1;
}
}
// apply linear interpolation
if ( (flag & (C352_FLG_FILTER | C352_FLG_NOISE)) == 0 )
{
sample = (short)(sample + ((nextsample-sample) * (((double)(0x0000ffff&offset) )/0x10000)));
}
if ( flag & C352_FLG_PHASEFL )
{
m_channel_l[i] += ((-sample * m_c352_ch[ch].vol_l)>>8);
}
else
{
m_channel_l[i] += ((sample * m_c352_ch[ch].vol_l)>>8);
}
if ( flag & C352_FLG_PHASEFR )
{
m_channel_r[i] += ((-sample * m_c352_ch[ch].vol_r)>>8);
}
else
{
m_channel_r[i] += ((sample * m_c352_ch[ch].vol_r)>>8);
}
if ( flag & C352_FLG_PHASERL )
{
m_channel_l2[i] += ((-sample * m_c352_ch[ch].vol_l2)>>8);
}
else
{
m_channel_l2[i] += ((sample * m_c352_ch[ch].vol_l2)>>8);
}
m_channel_r2[i] += ((sample * m_c352_ch[ch].vol_r2)>>8);
if ( (flag & C352_FLG_REVERSE) && (flag & C352_FLG_LOOP) )
{
if ( !(flag & C352_FLG_LDIR) )
{
pos += cnt;
if (
(((pos&0xFFFF) > m_c352_ch[ch].end_addr) && ((pos&0xFFFF) < m_c352_ch[ch].start) && (m_c352_ch[ch].start > m_c352_ch[ch].end_addr) ) ||
(((pos&0xFFFF) > m_c352_ch[ch].end_addr) && ((pos&0xFFFF) > m_c352_ch[ch].start) && (m_c352_ch[ch].start < m_c352_ch[ch].end_addr) ) ||
((pos > (bank|0xFFFF)) && (m_c352_ch[ch].end_addr == 0xFFFF))
)
{
m_c352_ch[ch].flag |= C352_FLG_LDIR;
m_c352_ch[ch].flag |= C352_FLG_LOOPHIST;
}
}
else
{
pos -= cnt;
if (
(((pos&0xFFFF) < m_c352_ch[ch].repeat) && ((pos&0xFFFF) < m_c352_ch[ch].end_addr) && (m_c352_ch[ch].end_addr > m_c352_ch[ch].start) ) ||
(((pos&0xFFFF) < m_c352_ch[ch].repeat) && ((pos&0xFFFF) > m_c352_ch[ch].end_addr) && (m_c352_ch[ch].end_addr < m_c352_ch[ch].start) ) ||
((pos < bank) && (m_c352_ch[ch].repeat == 0x0000))
)
{
m_c352_ch[ch].flag &= ~C352_FLG_LDIR;
m_c352_ch[ch].flag |= C352_FLG_LOOPHIST;
}
}
}
else if ( flag & C352_FLG_REVERSE )
{
pos -= cnt;
if (
(((pos&0xFFFF) < m_c352_ch[ch].end_addr) && ((pos&0xFFFF) < m_c352_ch[ch].start) && (m_c352_ch[ch].start > m_c352_ch[ch].end_addr) ) ||
(((pos&0xFFFF) < m_c352_ch[ch].end_addr) && ((pos&0xFFFF) > m_c352_ch[ch].start) && (m_c352_ch[ch].start < m_c352_ch[ch].end_addr) ) ||
((pos < bank) && (m_c352_ch[ch].end_addr == 0x0000))
)
{
if ( (flag & C352_FLG_LINK) && (flag & C352_FLG_LOOP) )
{
m_c352_ch[ch].bank = m_c352_ch[ch].start_addr & 0xFF;
m_c352_ch[ch].start_addr = m_c352_ch[ch].repeat_addr;
m_c352_ch[ch].start = m_c352_ch[ch].start_addr;
m_c352_ch[ch].repeat = m_c352_ch[ch].repeat_addr;
pos = (m_c352_ch[ch].bank<<16) + m_c352_ch[ch].start_addr;
m_c352_ch[ch].flag |= C352_FLG_LOOPHIST;
}
else if (flag & C352_FLG_LOOP)
{
pos = (pos & 0xFF0000) + m_c352_ch[ch].repeat;
m_c352_ch[ch].flag |= C352_FLG_LOOPHIST;
}
else
{
m_c352_ch[ch].flag |= C352_FLG_KEYOFF;
m_c352_ch[ch].flag &= ~C352_FLG_BUSY;
return;
}
}
} else {
pos += cnt;
if (
(((pos&0xFFFF) > m_c352_ch[ch].end_addr) && ((pos&0xFFFF) < m_c352_ch[ch].start) && (m_c352_ch[ch].start > m_c352_ch[ch].end_addr) ) ||
(((pos&0xFFFF) > m_c352_ch[ch].end_addr) && ((pos&0xFFFF) > m_c352_ch[ch].start) && (m_c352_ch[ch].start < m_c352_ch[ch].end_addr) ) ||
((pos > (bank|0xFFFF)) && (m_c352_ch[ch].end_addr == 0xFFFF))
)
{
if ( (flag & C352_FLG_LINK) && (flag & C352_FLG_LOOP) )
{
m_c352_ch[ch].bank = m_c352_ch[ch].start_addr & 0xFF;
m_c352_ch[ch].start_addr = m_c352_ch[ch].repeat_addr;
m_c352_ch[ch].start = m_c352_ch[ch].start_addr;
m_c352_ch[ch].repeat = m_c352_ch[ch].repeat_addr;
pos = (m_c352_ch[ch].bank<<16) + m_c352_ch[ch].start_addr;
m_c352_ch[ch].flag |= C352_FLG_LOOPHIST;
}
else if (flag & C352_FLG_LOOP)
{
pos = (pos & 0xFF0000) + m_c352_ch[ch].repeat;
m_c352_ch[ch].flag |= C352_FLG_LOOPHIST;
}
else
{
m_c352_ch[ch].flag |= C352_FLG_KEYOFF;
m_c352_ch[ch].flag &= ~C352_FLG_BUSY;
return;
}
}
}
}
m_c352_ch[ch].noisecnt = noisecnt;
m_c352_ch[ch].noisebuf = noisebuf;
m_c352_ch[ch].pos = offset;
m_c352_ch[ch].current_addr = pos;
}
void c352_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
int i, j;
stream_sample_t *bufferl = outputs[0];
stream_sample_t *bufferr = outputs[1];
stream_sample_t *bufferl2 = outputs[2];
stream_sample_t *bufferr2 = outputs[3];
for(i = 0 ; i < samples ; i++)
{
m_channel_l[i] = m_channel_r[i] = m_channel_l2[i] = m_channel_r2[i] = 0;
}
for (j = 0 ; j < 32 ; j++)
{
mix_one_channel(j, samples);
}
for(i = 0 ; i < samples ; i++)
{
*bufferl++ = (short) (m_channel_l[i] >>3);
*bufferr++ = (short) (m_channel_r[i] >>3);
*bufferl2++ = (short) (m_channel_l2[i] >>3);
*bufferr2++ = (short) (m_channel_r2[i] >>3);
}
}
unsigned short c352_device::read_reg16(unsigned long address)
{
unsigned long chan;
unsigned short val;
m_stream->update();
chan = (address >> 4) & 0xfff;
if (chan > 31)
{
val = 0;
}
else
{
if ((address & 0xf) == 6)
{
val = m_c352_ch[chan].flag;
}
else
{
val = 0;
}
}
return val;
}
void c352_device::write_reg16(unsigned long address, unsigned short val)
{
unsigned long chan;
int i;
m_stream->update();
chan = (address >> 4) & 0xfff;
if ( address >= 0x400 )
{
switch(address)
{
case 0x404: // execute key-ons/offs
for ( i = 0 ; i <= 31 ; i++ )
{
if ( m_c352_ch[i].flag & C352_FLG_KEYON )
{
if (m_c352_ch[i].start_addr != m_c352_ch[i].end_addr)
{
m_c352_ch[i].current_addr = (m_c352_ch[i].bank << 16) + m_c352_ch[i].start_addr;
m_c352_ch[i].start = m_c352_ch[i].start_addr;
m_c352_ch[i].repeat = m_c352_ch[i].repeat_addr;
m_c352_ch[i].noisebuf = 0;
m_c352_ch[i].noisecnt = 0;
m_c352_ch[i].flag &= ~(C352_FLG_KEYON | C352_FLG_LOOPHIST);
m_c352_ch[i].flag |= C352_FLG_BUSY;
}
}
else if ( m_c352_ch[i].flag & C352_FLG_KEYOFF )
{
m_c352_ch[i].flag &= ~C352_FLG_BUSY;
m_c352_ch[i].flag &= ~(C352_FLG_KEYOFF);
}
}
break;
default:
break;
}
return;
}
if (chan > 31)
{
LOG(("C352 CTRL %08lx %04x\n", address, val));
return;
}
switch(address & 0xf)
{
case 0x0:
// volumes (output 1)
LOG(("CH %02ld LVOL %02x RVOL %02x\n", chan, val & 0xff, val >> 8));
m_c352_ch[chan].vol_l = val & 0xff;
m_c352_ch[chan].vol_r = val >> 8;
break;
case 0x2:
// volumes (output 2)
LOG(("CH %02ld RLVOL %02x RRVOL %02x\n", chan, val & 0xff, val >> 8));
m_c352_ch[chan].vol_l2 = val & 0xff;
m_c352_ch[chan].vol_r2 = val >> 8;
break;
case 0x4:
// pitch
LOG(("CH %02ld PITCH %04x\n", chan, val));
m_c352_ch[chan].pitch = val;
break;
case 0x6:
// flags
LOG(("CH %02ld FLAG %02x\n", chan, val));
m_c352_ch[chan].flag = val;
break;
case 0x8:
// bank (bits 16-31 of address);
m_c352_ch[chan].bank = val & 0xff;
LOG(("CH %02ld BANK %02x", chan, m_c352_ch[chan].bank));
break;
case 0xa:
// start address
LOG(("CH %02ld SADDR %04x\n", chan, val));
m_c352_ch[chan].start_addr = val;
break;
case 0xc:
// end address
LOG(("CH %02ld EADDR %04x\n", chan, val));
m_c352_ch[chan].end_addr = val;
break;
case 0xe:
// loop address
LOG(("CH %02ld LADDR %04x\n", chan, val));
m_c352_ch[chan].repeat_addr = val;
break;
default:
LOG(("CH %02ld UNKN %01lx %04x", chan, address & 0xf, val));
break;
}
}
void c352_device::device_start()
{
int i;
double x_max = 32752.0;
double y_max = 127.0;
double u = 10.0;
// find our direct access
m_direct = &space().direct();
m_sample_rate_base = clock() / m_divider;
m_stream = machine().sound().stream_alloc(*this, 0, 4, m_sample_rate_base);
// generate mulaw table for mulaw format samples
for (i = 0; i < 256; i++)
{
double y = (double) (i & 0x7f);
double x = (exp (y / y_max * log (1.0 + u)) - 1.0) * x_max / u;
if (i & 0x80)
{
x = -x;
}
m_mulaw_table[i] = (short)x;
}
// register save state info
for (i = 0; i < 32; i++)
{
save_item(NAME(m_c352_ch[i].vol_l), i);
save_item(NAME(m_c352_ch[i].vol_r), i);
save_item(NAME(m_c352_ch[i].vol_l2), i);
save_item(NAME(m_c352_ch[i].vol_r2), i);
save_item(NAME(m_c352_ch[i].bank), i);
save_item(NAME(m_c352_ch[i].noise), i);
save_item(NAME(m_c352_ch[i].noisebuf), i);
save_item(NAME(m_c352_ch[i].noisecnt), i);
save_item(NAME(m_c352_ch[i].pitch), i);
save_item(NAME(m_c352_ch[i].start_addr), i);
save_item(NAME(m_c352_ch[i].end_addr), i);
save_item(NAME(m_c352_ch[i].repeat_addr), i);
save_item(NAME(m_c352_ch[i].flag), i);
save_item(NAME(m_c352_ch[i].start), i);
save_item(NAME(m_c352_ch[i].repeat), i);
save_item(NAME(m_c352_ch[i].current_addr), i);
save_item(NAME(m_c352_ch[i].pos), i);
}
}
void c352_device::device_reset()
{
// clear all channels states
memset(m_c352_ch, 0, sizeof(c352_ch_t)*32);
// init noise generator
m_mseq_reg = 0x12345678;
}
READ16_MEMBER( c352_device::read )
{
return(read_reg16(offset*2));
}
WRITE16_MEMBER( c352_device::write )
{
if (mem_mask == 0xffff)
{
write_reg16(offset*2, data);
}
else
{
logerror("C352: byte-wide write unsupported at this time!\n");
}
}