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|
// license:BSD-3-Clause
// copyright-holders:Olivier Galibert, R. Belmont, MetalliC
/***************************************************************************
Yamaha YMZ770C and YMZ774
Emulation by R. Belmont and MetalliC
AMM decode by Olivier Galibert
-----
TODO:
- What does channel ATBL mean?
770:
- verify if pan 100% correct
- sequencer timers and triggers not implemented (seems used in Deathsmiles ending tune)
774:
- find out how volume/pan delayed transition works (used few times in orleg2 attract mode)
- 4 channel output
- Equalizer
- Sequencer (not used)
***************************************************************************/
#include "emu.h"
#include "ymz770.h"
#include "mpeg_audio.h"
// device type definition
DEFINE_DEVICE_TYPE(YMZ770, ymz770_device, "ymz770", "Yamaha YMZ770C-F AMMS-A")
DEFINE_DEVICE_TYPE(YMZ774, ymz774_device, "ymz774", "Yamaha YMZ774-S AMMS2")
//-------------------------------------------------
// ymz770_device - constructor
//-------------------------------------------------
ymz770_device::ymz770_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: ymz770_device(mconfig, YMZ770, tag, owner, clock, 16000)
{
}
ymz770_device::ymz770_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock, uint32_t sclock)
: device_t(mconfig, type, tag, owner, clock)
, device_sound_interface(mconfig, *this)
, m_stream(nullptr)
, m_sclock(sclock)
, m_cur_reg(0)
, m_mute(0)
, m_doen(0)
, m_vlma(0)
, m_vlma1(0)
, m_bsl(0)
, m_cpl(0)
, m_rom(*this, DEVICE_SELF)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void ymz770_device::device_start()
{
// create the stream
m_stream = machine().sound().stream_alloc(*this, 0, 2, m_sclock);
for (auto & channel : m_channels)
{
channel.is_playing = false;
channel.decoder = new mpeg_audio(&m_rom[0], mpeg_audio::AMM, false, 0);
}
for (auto & sequence : m_sequences)
sequence.is_playing = false;
// register for save states
save_item(NAME(m_cur_reg));
save_item(NAME(m_mute));
save_item(NAME(m_doen));
save_item(NAME(m_vlma));
save_item(NAME(m_vlma1));
save_item(NAME(m_bsl));
save_item(NAME(m_cpl));
for (int ch = 0; ch < 16; ch++) // TODO array size
{
save_item(NAME(m_channels[ch].phrase), ch);
save_item(NAME(m_channels[ch].pan), ch);
save_item(NAME(m_channels[ch].pan_delay), ch);
save_item(NAME(m_channels[ch].pan1), ch);
save_item(NAME(m_channels[ch].pan1_delay), ch);
save_item(NAME(m_channels[ch].volume), ch);
save_item(NAME(m_channels[ch].volume_delay), ch);
save_item(NAME(m_channels[ch].volume2), ch);
save_item(NAME(m_channels[ch].loop), ch);
save_item(NAME(m_channels[ch].is_playing), ch);
save_item(NAME(m_channels[ch].last_block), ch);
save_item(NAME(m_channels[ch].output_remaining), ch);
save_item(NAME(m_channels[ch].output_ptr), ch);
save_item(NAME(m_channels[ch].atbl), ch);
save_item(NAME(m_channels[ch].pptr), ch);
save_item(NAME(m_channels[ch].output_data), ch);
}
for (int ch = 0; ch < 8; ch++)
{
save_item(NAME(m_sequences[ch].delay), ch);
save_item(NAME(m_sequences[ch].sequence), ch);
save_item(NAME(m_sequences[ch].timer), ch);
save_item(NAME(m_sequences[ch].stopchan), ch);
save_item(NAME(m_sequences[ch].loop), ch);
save_item(NAME(m_sequences[ch].bank), ch);
save_item(NAME(m_sequences[ch].is_playing), ch);
}
for (int ch = 0; ch < 8; ch++)
{
save_item(NAME(m_sqcs[ch].sqc), ch);
save_item(NAME(m_sqcs[ch].loop), ch);
save_item(NAME(m_sqcs[ch].is_playing), ch);
save_item(NAME(m_sqcs[ch].is_waiting), ch);
}
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void ymz770_device::device_reset()
{
for (auto & channel : m_channels)
{
channel.phrase = 0;
channel.pan = 64;
channel.pan_delay = 0;
channel.pan1 = 64;
channel.pan1_delay = 0;
channel.volume = 0;
channel.volume_delay = 0;
channel.volume2 = 0;
channel.loop = 0;
channel.is_playing = false;
channel.output_remaining = 0;
channel.decoder->clear();
}
for (auto & sequence : m_sequences)
{
sequence.delay = 0;
sequence.sequence = 0;
sequence.timer = 0;
sequence.stopchan = 0;
sequence.loop = 0;
sequence.bank = 0;
sequence.is_playing = false;
}
for (auto & sqc : m_sqcs)
{
sqc.is_playing = false;
sqc.loop = 0;
}
}
//-------------------------------------------------
// sound_stream_update - handle update requests for
// our sound stream
//-------------------------------------------------
void ymz770_device::sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples)
{
stream_sample_t *outL, *outR;
outL = outputs[0];
outR = outputs[1];
for (int i = 0; i < samples; i++)
{
sequencer();
// process channels
int32_t mixl = 0;
int32_t mixr = 0;
for (auto & channel : m_channels)
{
if (channel.output_remaining > 0)
{
// force finish current block
int32_t smpl = (channel.output_data[channel.output_ptr++] * channel.volume) >> 7; // volume is linear, 0 - 128 (100%)
smpl = (smpl * channel.volume2) >> 7;
mixr += (smpl * channel.pan) >> 7; // pan seems linear, 0 - 128, where 0 = 100% left, 128 = 100% right, 64 = 50% left 50% right
mixl += (smpl * (128 - channel.pan)) >> 7;
channel.output_remaining--;
if (channel.output_remaining == 0 && !channel.is_playing)
channel.decoder->clear();
}
else if (channel.is_playing)
{
retry:
if (channel.last_block)
{
if (channel.loop)
{
if (channel.loop != 255)
--channel.loop;
// loop sample
int phrase = channel.phrase;
channel.atbl = m_rom[(4*phrase)+0] >> 4 & 7;
channel.pptr = 8 * get_phrase_offs(phrase);
}
else
{
channel.is_playing = false;
channel.output_remaining = 0;
channel.decoder->clear();
}
}
if (channel.is_playing)
{
// next block
int sample_rate, channel_count;
if (!channel.decoder->decode_buffer(channel.pptr, m_rom.bytes()*8, channel.output_data, channel.output_remaining, sample_rate, channel_count) || channel.output_remaining == 0)
{
channel.is_playing = !channel.last_block; // detect infinite retry loop
channel.last_block = true;
channel.output_remaining = 0;
goto retry;
}
channel.last_block = channel.output_remaining < 1152;
channel.output_remaining--;
channel.output_ptr = 1;
int32_t smpl = (channel.output_data[0] * channel.volume) >> 7;
smpl = (smpl * channel.volume2) >> 7;
mixr += (smpl * channel.pan) >> 7;
mixl += (smpl * (128 - channel.pan)) >> 7;
}
}
}
mixr *= m_vlma; // main volume is linear, 0 - 255, where 128 = 100%
mixl *= m_vlma;
mixr >>= 7 - m_bsl;
mixl >>= 7 - m_bsl;
// Clip limiter: 0 - off, 1 - 6.02 dB (100%), 2 - 4.86 dB (87.5%), 3 - 3.52 dB (75%). values taken from YMZ773 docs, might be incorrect for YMZ770.
constexpr int32_t ClipMax3 = 32768 * 75 / 100;
constexpr int32_t ClipMax2 = 32768 * 875 / 1000;
switch (m_cpl)
{
case 3:
mixl = (mixl > ClipMax3) ? ClipMax3 : (mixl < -ClipMax3) ? -ClipMax3 : mixl;
mixr = (mixr > ClipMax3) ? ClipMax3 : (mixr < -ClipMax3) ? -ClipMax3 : mixr;
break;
case 2:
mixl = (mixl > ClipMax2) ? ClipMax2 : (mixl < -ClipMax2) ? -ClipMax2 : mixl;
mixr = (mixr > ClipMax2) ? ClipMax2 : (mixr < -ClipMax2) ? -ClipMax2 : mixr;
break;
case 1:
mixl = (mixl > 32767) ? 32767 : (mixl < -32768) ? -32768 : mixl;
mixr = (mixr > 32767) ? 32767 : (mixr < -32768) ? -32768 : mixr;
break;
}
if (m_mute)
mixr = mixl = 0;
outL[i] = mixl;
outR[i] = mixr;
}
}
void ymz770_device::sequencer()
{
for (auto & sequence : m_sequences)
{
if (sequence.is_playing)
{
if (sequence.delay > 0)
{
sequence.delay--;
}
else
{
int reg = *sequence.data++;
uint8_t data = *sequence.data++;
switch (reg)
{
case 0x0f:
if (sequence.loop)
{
// loop sequence
uint8_t sqn = sequence.sequence;
uint32_t pptr = get_seq_offs(sqn);
sequence.data = &m_rom[pptr];
}
else
{
sequence.is_playing = false;
}
break;
case 0x0e:
sequence.delay = 32 - 1;
break;
default:
internal_reg_write(reg, data);
break;
}
}
}
}
}
//-------------------------------------------------
// write - write to the chip's registers
//-------------------------------------------------
WRITE8_MEMBER( ymz770_device::write )
{
if (offset & 1)
{
m_stream->update();
internal_reg_write(m_cur_reg, data);
}
else
{
m_cur_reg = data;
}
}
void ymz770_device::internal_reg_write(uint8_t reg, uint8_t data)
{
// global registers
if (reg < 0x40)
{
switch (reg)
{
case 0x00:
m_mute = data & 1;
m_doen = data >> 1 & 1;
break;
case 0x01:
m_vlma = data;
break;
case 0x02:
m_bsl = data & 7;
m_cpl = data >> 4 & 7;
break;
// unused
default:
break;
}
}
// playback registers
else if (reg < 0x60)
{
int ch = reg >> 2 & 0x07;
switch (reg & 0x03)
{
case 0:
m_channels[ch].phrase = data;
break;
case 1:
m_channels[ch].volume = data;
m_channels[ch].volume2 = 128;
break;
case 2:
m_channels[ch].pan = data << 3;
break;
case 3:
if (data & 6)
{
uint8_t phrase = m_channels[ch].phrase;
m_channels[ch].atbl = m_rom[(4*phrase)+0] >> 4 & 7;
m_channels[ch].pptr = 8 * get_phrase_offs(phrase);
m_channels[ch].last_block = false;
m_channels[ch].is_playing = true;
}
else
{
m_channels[ch].is_playing = false;
}
m_channels[ch].loop = (data & 1) ? 255 : 0;
break;
}
}
// sequencer registers
else
{
int ch = reg >> 4 & 0x07;
switch (reg & 0x0f)
{
case 0:
m_sequences[ch].sequence = data;
break;
case 1:
if (data & 6)
{
uint8_t sqn = m_sequences[ch].sequence;
uint32_t pptr = get_seq_offs(sqn);
m_sequences[ch].data = &m_rom[pptr];
m_sequences[ch].delay = 0;
m_sequences[ch].is_playing = true;
}
else
{
m_sequences[ch].is_playing = false;
}
m_sequences[ch].loop = data & 1;
break;
default:
break;
}
}
}
//-------------------------------------------------
// ymz774_device
//-------------------------------------------------
ymz774_device::ymz774_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: ymz770_device(mconfig, YMZ774, tag, owner, clock, 44100)
{
}
READ8_MEMBER(ymz774_device::read)
{
if (offset & 1)
{
if (m_cur_reg == 0xe3 || m_cur_reg == 0xe4)
{
m_stream->update();
uint8_t res = 0;
int bank = (m_cur_reg == 0xe3) ? 8 : 0;
for (int i = 0; i < 8; i++)
if (m_channels[i + bank].is_playing)
res |= 1 << i;
return res;
}
}
logerror("unimplemented read %02X\n", m_cur_reg);
return 0;
}
void ymz774_device::internal_reg_write(uint8_t reg, uint8_t data)
{
// playback registers
if (reg < 0x10) // phrase num H and L
{
int ch = ((reg >> 1) & 7) + m_bank * 8;
if (reg & 1)
m_channels[ch].phrase = (m_channels[ch].phrase & 0xff00) | data;
else
m_channels[ch].phrase = (m_channels[ch].phrase & 0x00ff) | ((data & 7) << 8);
}
else if (reg < 0x60)
{
int ch = (reg & 7) + m_bank * 8;
switch (reg & 0xf8)
{
case 0x10: // Volume 1
m_channels[ch].volume = data;
break;
case 0x18: // Volume 1 delayed transition
if (data) logerror("unimplemented write %02X %02X\n", reg, data);
m_channels[ch].volume_delay = data;
break;
case 0x20: // Volume 2
m_channels[ch].volume2 = data;
break;
case 0x28: // Pan L/R
m_channels[ch].pan = data;
break;
case 0x30: // Pan L/R delayed transition
if (data) logerror("unimplemented write %02X %02X\n", reg, data);
m_channels[ch].pan_delay = data;
break;
case 0x38: // Pan T/B
m_channels[ch].pan1 = data;
break;
case 0x40: // Pan T/B delayed transition
if (data) logerror("unimplemented write %02X %02X\n", reg, data);
m_channels[ch].pan1_delay = data;
break;
case 0x48: // Loop
m_channels[ch].loop = data;
break;
case 0x50: // Start / Stop
if (data)
{
int phrase = m_channels[ch].phrase;
m_channels[ch].atbl = m_rom[(4 * phrase) + 0] >> 4 & 7;
m_channels[ch].pptr = 8 * get_phrase_offs(phrase);
m_channels[ch].last_block = false;
m_channels[ch].is_playing = true;
}
else
{
m_channels[ch].is_playing = false;
}
break;
case 0x58: // Pause / Resume
if (data) logerror("pause/resume unimplemented %02X %02X\n", reg, data);
break;
}
}
else if (reg < 0xd0)
{
if (m_bank == 0)
{
if (reg < 0xb0)
{
int sq = reg & 7;
switch (reg & 0xf8)
{
case 0x60: // sequence num H and L
case 0x68:
sq = (reg >> 1) & 7;
if (reg & 1)
m_sequences[sq].sequence = (m_sequences[sq].sequence & 0xff00) | data;
else
m_sequences[sq].sequence = (m_sequences[sq].sequence & 0x00ff) | ((data & 0x0f) << 8);
break;
case 0x70: // Start / Stop
if (data)
{
uint32_t pptr = get_seq_offs(m_sequences[sq].sequence);
m_sequences[sq].data = &m_rom[pptr];
m_sequences[sq].delay = 0;
m_sequences[sq].is_playing = true;
}
else
{
m_sequences[sq].is_playing = false;
}
break;
case 0x78: // Pause / Resume
if (data) logerror("SEQ pause/resume unimplemented %02X %02X\n", reg, data);
break;
case 0x80: // Loop count, 0 = off, 255 - infinite
m_sequences[sq].loop = data;
break;
case 0x88: // timer H and L
case 0x90:
sq = (reg - 0x88) >> 1;
if (reg & 1)
m_sequences[sq].timer = (m_sequences[sq].timer & 0xff00) | data;
else
m_sequences[sq].timer = (m_sequences[sq].timer & 0x00ff) | (data << 8);
break;
case 0x98: // Off trigger, bit4 = on/off, bits0-3 channel (end sequence when channel playback ends)
if (data) logerror("SEQ Off trigger unimplemented %02X %02X\n", reg, data);
break;
case 0xa0: // stop channel mask H and L, what it for ? stop chanels immediatelly or when sequence ends (so far assuming later) ?
case 0xa8:
sq = (reg >> 1) & 7;
if (reg & 1)
m_sequences[sq].stopchan = (m_sequences[sq].stopchan & 0xff00) | data;
else
m_sequences[sq].stopchan = (m_sequences[sq].stopchan & 0x00ff) | (data << 8);
break;
}
}
else
{
int sq = reg & 7;
switch (reg & 0xf8)
{
case 0xb0:
m_sqcs[sq].sqc = data;
break;
case 0xb8:
if (data)
{
m_sqcs[sq].data = &m_rom[get_sqc_offs(m_sqcs[sq].sqc)];
m_sqcs[sq].is_playing = true;
m_sqcs[sq].is_waiting = false;
}
else
m_sqcs[sq].is_playing = false;
break;
case 0xc0:
m_sqcs[sq].loop = data;
break;
}
}
}
// else bank1 - Equalizer control
}
// global registers
else
{
switch (reg) {
case 0xd0:
m_vlma = data;
break;
case 0xd1:
m_vlma1 = data;
break;
case 0xd2:
m_cpl = data;
break;
case 0xf0:
m_bank = data & 1;
if (data > 1) logerror("Set bank %02X!\n", data);
break;
}
}
}
void ymz774_device::sequencer()
{
for (int i = 0; i < 8; i++)
{
auto & sqc = m_sqcs[i];
auto & sequence = m_sequences[i];
if (sqc.is_playing && !sqc.is_waiting)
{
sequence.sequence = ((sqc.data[0] << 8) | sqc.data[1]) & 0xfff;
sequence.loop = sqc.data[2];
sequence.data = &m_rom[get_seq_offs(sequence.sequence)];
sequence.delay = 0;
sequence.is_playing = true;
//printf("sqc pl %d lp %d last %d\n", sequence.sequence, sequence.loop, sqc.data[3]);
if (sqc.data[3] == 0xff)
{
if (sqc.loop)
{
if (sqc.loop != 255)
--sqc.loop;
sqc.data = &m_rom[get_sqc_offs(sqc.sqc)];
}
else
sqc.is_playing = false;
}
else
{
sqc.is_waiting = true;
sqc.data += 4;
}
}
if (sequence.is_playing)
{
if (sequence.delay > 0)
{
--sequence.delay;
}
else
{
int reg = *sequence.data++;
uint8_t data = *sequence.data++;
switch (reg)
{
case 0xff: // end
for (int ch = 0; ch < 16; ch++) // check this
if (sequence.stopchan & (1 << ch))
m_channels[ch].is_playing = false;
if (sequence.loop)
{
if (sequence.loop != 255)
--sequence.loop;
uint32_t pptr = get_seq_offs(sequence.sequence);
sequence.data = &m_rom[pptr];
}
else
{
sequence.is_playing = false;
sqc.is_waiting = false;
}
break;
case 0xfe: // timer delay
sequence.delay = sequence.timer * 32; // possible needed -1 or +(32-1)
break;
case 0xf0:
sequence.bank = data & 1;
break;
default:
{
uint8_t temp = m_bank;
m_bank = sequence.bank;
if (m_bank == 0 && reg >= 0x60 && reg < 0xb0) // if we hit SEQ registers need to add this sequence offset
{
int sqn = i;
if (reg < 0x70 || (reg >= 0x88 && reg < 0x98) || reg >= 0xa0)
sqn = i * 2;
internal_reg_write(reg + sqn, data);
}
else
internal_reg_write(reg, data);
m_bank = temp;
}
break;
}
}
}
}
}
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