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eupplayer_townsEmulator.cpp
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// $Id: eupplayer_townsEmulator.cc,v 1.24 2000/04/12 23:14:35 hayasaka Exp $
/* Artistic Style
*
* ./astyle --style=stroustrup --convert-tabs --add-braces eupplayer_townsEmulator.cpp
*/
#include <cstdint>
#include <cstdio>
#include <sys/stat.h>
#include <cassert>
#include <cstring>
#include <cmath>
#if defined ( __MINGW32__ )
#include <_bsd_types.h>
#endif
#if defined ( _MSC_VER )
#include <SDL.h>
#endif // _MSC_VER
#if defined ( __MINGW32__ )
#include <SDL2/SDL.h>
#endif // __MINGW32__
#if defined ( __GNUC__ ) && !defined ( __MINGW32__ )
#include <SDL2/SDL.h>
#endif // __GNUC__
#include "eupplayer_townsEmulator.hpp"
#include "sintbl.hpp"
#if EUPPLAYER_LITTLE_ENDIAN
static inline uint16_t P2(uint8_t const * const p)
{
return *(reinterpret_cast<uint16_t const *>(p));
}
static inline uint32_t P4(uint8_t const * const p)
{
return *(reinterpret_cast<uint32_t const *>(p));
}
#else
static inline uint16_t P2(uint8_t const * const p)
{
uint16_t const x0 = *p;
uint16_t const x1 = *(p + 1);
return x0 + (x1 << 8);
}
static inline uint32_t P4(uint8_t const * const p)
{
uint32_t const x0 = P2(p);
uint32_t const x1 = P2(p + 2);
return x0 + (x1 << 16);
}
#endif
#ifdef DEBUG
#include <stdarg.h>
static void dbprintf(char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fflush(stderr);
}
#define DB(a) dbprintf##a
#else
#define DB(a)
#endif
#define CHECK_CHANNEL_NUM(funcname, channel) \
if (channel < 0 || _maxChannelNum <= channel) { \
fprintf(stderr, "%s: channel number %d out of range\n", funcname, channel); \
fflush(stderr); \
return; \
} \
(void)false
/* TownsPcmSound */
class TownsPcmSound {
char _name[9];
int _id;
int _numSamples;
int _loopStart;
int _loopLength;
int _samplingRate;
int _adjustedSamplingRate;
int _keyOffset;
int _keyNote;
signed char *_samples;
public:
TownsPcmSound(uint8_t const *p);
~TownsPcmSound();
int id() const
{
return _id;
}
int numSamples() const
{
return _numSamples;
}
int loopStart() const
{
return _loopStart;
}
int loopLength() const
{
return _loopLength;
}
int samplingRate() const
{
return _samplingRate;
}
int keyOffset() const
{
return _keyOffset;
}
int adjustedSamplingRate() const
{
return _adjustedSamplingRate;
}
int keyNote() const
{
return _keyNote;
}
signed char const * samples() const
{
return _samples;
}
};
TownsPcmSound::TownsPcmSound(uint8_t const *p)
{
{
u_int n = 0;
for (; n < sizeof(_name)-1; n++) {
_name[n] = static_cast<char>(p[n]);
}
_name[n] = '\0';
}
_id = static_cast<int>(P4(p+8));
_numSamples = static_cast<int>(P4(p+12));
_loopStart = static_cast<int>(P4(p+16));
_loopLength = static_cast<int>(P4(p+20));
_samplingRate = static_cast<int>(P2(p + 24));
_keyOffset = static_cast<int>(P2(p + 26));
int64_t adjfact = (1000 * 0x10000 / 0x62);
//adjfact *= (_samplingRate + _keyOffset);
adjfact *= _samplingRate;
_adjustedSamplingRate = static_cast<int>(adjfact);
_keyNote = static_cast<int>(*(p+28));
if (_loopStart >= _numSamples) {
fprintf(stderr, "TownsPcmSound::TownsPcmSound: too large loopStart. loopStart zeroed. loopStart=0x%08x, numSamples=0x%08x\n", _loopStart, _numSamples);
_loopStart = 0;
}
if (_loopLength > _numSamples - _loopStart) {
fprintf(stderr, "TownsPcmSound::TownsPcmSound: too large loopLength. loop disabled. loopStart=0x%08x, loopLength=0x%08x, numSamples=0x%08x\n", _loopStart, _loopLength, _numSamples);
_loopLength = 0;
}
if ((_loopLength != 0) && (_loopStart + _loopLength < _numSamples)) {
_numSamples = _loopStart + _loopLength;
}
_samples = new signed char[_numSamples + 1]; // append 1 sample, in order to avoid buffer overflow in liner interpolation process
for (int i = 0; i < _numSamples; i++) {
// for further study why loading _samples with the following statement is not a good way
//_samples[i] = *(reinterpret_cast<const signed char*>(p + 32 + i));
uint8_t n = p[32 + i];
_samples[i] = (n >= 0x80u) ? static_cast<signed char>((n & 0x7fu)) : static_cast<signed char>(-n);
}
_samples[_numSamples] = 0; // append 1 sample, in order to avoid buffer overflow in liner interpolation process
//cerr << this->describe() << '\n';
}
TownsPcmSound::~TownsPcmSound()
{
if (_samples != nullptr) {
delete[] _samples;
}
}
/* TownsPcmEnvelope */
class TownsPcmEnvelope {
enum State { _s_ready=0, _s_attacking, _s_decaying, _s_sustaining, _s_releasing };
State _state;
State _oldState;
int _currentLevel;
int _rate;
int _tickCount;
int _totalLevel;
int _attackRate;
int _decayRate;
int _sustainLevel;
int _sustainRate;
int _releaseLevel;
int _releaseRate;
int _rootKeyOffset;
public:
TownsPcmEnvelope(TownsPcmEnvelope const *e);
TownsPcmEnvelope(uint8_t const *p);
~TownsPcmEnvelope();
void start(int rate);
void release();
int nextTick();
int state()
{
return (int)(_state);
}
int rootKeyOffset()
{
return _rootKeyOffset;
}
};
TownsPcmEnvelope::TownsPcmEnvelope(TownsPcmEnvelope const *e)
{
memcpy(this, e, sizeof(*this));
}
TownsPcmEnvelope::TownsPcmEnvelope(uint8_t const *p)
{
_state = _s_ready;
_oldState = _s_ready;
_currentLevel = 0;
_totalLevel = static_cast<int>(*(p+0));
_attackRate = static_cast<int>(*(p+1)) * 10;
_decayRate = static_cast<int>(*(p+2)) * 10;
_sustainLevel = static_cast<int>(*(p+3));
_sustainRate = static_cast<int>(*(p+4)) * 20;
_releaseRate = static_cast<int>(*(p+5)) * 10;
_rootKeyOffset = static_cast<int>(*(p+6));
//cerr << this->describe() << '\n';
}
TownsPcmEnvelope::~TownsPcmEnvelope()
{
}
void TownsPcmEnvelope::start(int rate)
{
_state = _s_attacking;
_currentLevel = 0;
_rate = rate;
_tickCount = 0;
}
void TownsPcmEnvelope::release()
{
if (_state == _s_ready) {
return;
}
_state = _s_releasing;
_releaseLevel = _currentLevel;
_tickCount = 0;
}
int TownsPcmEnvelope::nextTick()
{
if (_oldState != _state) {
switch (_oldState) {
default:
break;
};
_oldState = _state;
}
switch (_state) {
case _s_ready:
return 0;
break;
case _s_attacking:
if (_attackRate == 0) {
_currentLevel = _totalLevel;
}
else if (_attackRate >= 1270) {
_currentLevel = 0;
}
else {
int64_t currLvl = _totalLevel * (_tickCount++) * 1000LL;
currLvl /= (_attackRate * _rate);
_currentLevel = static_cast<int>(currLvl);
}
if (_currentLevel >= _totalLevel) {
_currentLevel = _totalLevel;
_state = _s_decaying;
_tickCount = 0;
}
break;
case _s_decaying:
if (_decayRate == 0) {
_currentLevel = _sustainLevel;
}
else if (_decayRate >= 1270) {
_currentLevel = _totalLevel;
}
else {
int64_t currLvl = (_totalLevel - _sustainLevel) * (_tickCount++) * 1000LL;
currLvl /= (_decayRate * _rate);
_currentLevel = _totalLevel;
_currentLevel -= static_cast<int>(currLvl);
}
if (_currentLevel <= _sustainLevel) {
_currentLevel = _sustainLevel;
_state = _s_sustaining;
_tickCount = 0;
}
break;
case _s_sustaining:
if (_sustainRate == 0) {
_currentLevel = 0;
}
else if (_sustainRate >= 2540) {
_currentLevel = _sustainLevel;
}
else {
int64_t currLvl = _sustainLevel * (_tickCount++) * 1000LL;
currLvl /= (_sustainRate * _rate);
_currentLevel = _sustainLevel;
_currentLevel -= static_cast<int>(currLvl);
}
if (_currentLevel <= 0) {
_currentLevel = 0;
_state = _s_ready;
_tickCount = 0;
}
break;
case _s_releasing:
if (_releaseRate == 0) {
_currentLevel = 0;
}
else if (_releaseRate >= 1270) {
_currentLevel = _releaseLevel;
}
else {
int64_t currLvl = _releaseLevel * (_tickCount++) * 1000LL;
currLvl /= (_releaseRate * _rate);
_currentLevel = _releaseLevel;
_currentLevel -= static_cast<int>(currLvl);
}
if (_currentLevel <= 0) {
_currentLevel = 0;
_state = _s_ready;
}
break;
default:
// ここには来ないはず
break;
};
return _currentLevel;
}
/* TownsPcmInstrument */
class TownsPcmInstrument {
enum { _maxSplitNum = 8, };
char _name[9];
int _split[_maxSplitNum];
int _soundId[_maxSplitNum];
TownsPcmSound const *_sound[_maxSplitNum];
TownsPcmEnvelope *_envelope[_maxSplitNum];
public:
TownsPcmInstrument(uint8_t const *p);
TownsPcmInstrument();
void registerSound(TownsPcmSound const *sound);
TownsPcmSound const *findSound(int note) const;
TownsPcmEnvelope const *findEnvelope(int note) const;
};
TownsPcmInstrument::TownsPcmInstrument(uint8_t const *p)
{
uint8_t n = 0u;
for (; n < sizeof(_name)-1; n++) {
_name[n] = p[n];
}
_name[n] = '\0';
for (n = 0u; n < static_cast<uint8_t>(_maxSplitNum); n++) {
_split[n] = static_cast<int>(P2(p+16+2*n));
_soundId[n] = static_cast<int>(P4(p+32+4*n));
_sound[n] = nullptr;
_envelope[n] = new TownsPcmEnvelope(p+64+8*n);
}
//cerr << this->describe() << '\n';
}
TownsPcmInstrument::TownsPcmInstrument()
{
}
void TownsPcmInstrument::registerSound(TownsPcmSound const *sound)
{
for (uint8_t i = 0u; i < static_cast<uint8_t>(_maxSplitNum); i++) {
if (_soundId[i] == sound->id()) {
_sound[i] = sound;
}
}
}
TownsPcmSound const *TownsPcmInstrument::findSound(int note) const
{
// 少なくともどれかの split を選択できるようにしておこう
uint8_t splitNum = 0u;
for (; splitNum < (static_cast<uint8_t>(_maxSplitNum)-1u); splitNum++) {
if (note <= _split[splitNum]) {
break;
}
}
return _sound[splitNum];
}
TownsPcmEnvelope const *TownsPcmInstrument::findEnvelope(int note) const
{
// 少なくともどれかの split を選択できるようにしておこう
uint8_t splitNum = 0u;
for (; splitNum < (static_cast<uint8_t>(_maxSplitNum) - 1u); splitNum++) {
if (note <= _split[splitNum]) {
break;
}
}
return _envelope[splitNum];
}
/* TownsFmEmulator_Operator */
TownsFmEmulator_Operator::TownsFmEmulator_Operator()
{
_state = _s_ready;
_oldState = _s_ready;
_currentLevel = 0x7fLL << 31;
_phase = 0;
_lastOutput = 0;
_feedbackLevel = 0;
_detune = 0;
_multiple = 1;
_specifiedTotalLevel = 127;
_keyScale = 0;
_specifiedAttackRate = 0;
_specifiedDecayRate = 0;
_specifiedSustainRate = 0;
_specifiedReleaseRate = 15;
this->velocity(0);
}
TownsFmEmulator_Operator::~TownsFmEmulator_Operator()
{
}
void TownsFmEmulator_Operator::velocity(int velo)
{
_velocity = velo;
_totalLevel = (static_cast<int64_t>(_specifiedTotalLevel) << 31) +
(static_cast<int64_t>(127-_velocity) << 29);
_sustainLevel = static_cast<int64_t>(_specifiedSustainLevel) << (31+2);
}
void TownsFmEmulator_Operator::feedbackLevel(int level)
{
_feedbackLevel = level;
}
void TownsFmEmulator_Operator::setInstrumentParameter(u_char const *instrument)
{
_detune = (instrument[8] >> 4) & 7;
_multiple = instrument[8] & 15;
_specifiedTotalLevel = instrument[12] & 127;
_keyScale = (instrument[16] >> 6) & 3;
_specifiedAttackRate = instrument[16] & 31;
_specifiedDecayRate = instrument[20] & 31;
_specifiedSustainRate = instrument[24] & 31;
_specifiedSustainLevel = (instrument[28] >> 4) & 15;
_specifiedReleaseRate = instrument[28] & 15;
_state = _s_ready; // 本物ではどうなのかな?
this->velocity(_velocity);
}
void TownsFmEmulator_Operator::keyOn()
{
_state = _s_attacking;
_tickCount = 0;
_phase = 0; // どうも、実際こうらしい
_currentLevel = 0x7fLL << 31; // これも、実際こうらしい
}
void TownsFmEmulator_Operator::keyOff()
{
if (_state != _s_ready) {
_state = _s_releasing;
}
}
void TownsFmEmulator_Operator::frequency(int freq)
{
int r;
//DB(("freq=%d=%d[Hz]\n", freq, freq/262205));
_frequency = freq;
r = _specifiedAttackRate;
if (r != 0) {
r = r * 2 + (keyscaleTable[freq/262205] >> (3-_keyScale));
if (r >= 64) {
r = 63; // するべきなんだろうとは思うんだけど (赤p.207)
}
}
{
r = 63 - r;
int64_t t;
if (_specifiedTotalLevel >= 128) {
t = 0LL;
}
else {
t = powtbl[(r&3) << 7];
t <<= (r >> 2);
t *= 41LL; // r == 4 のとき、0-96db が 8970.24ms
t >>= (15 + 5);
t *= 127LL - static_cast<int64_t>(_specifiedTotalLevel);
t /= 127LL;
}
_attackTime = static_cast<int>(t); // 1 秒 == (1 << 12)
//DB(("AR=%d->%d, 0-96[db]=%d[ms]\n", _specifiedAttackRate, r, (int)((t*1000)>>12)));
}
r = _specifiedDecayRate;
if (r != 0) {
r = r * 2 + (keyscaleTable[freq/262205] >> (3-_keyScale));
if (r >= 64) {
r = 63;
}
}
//DB(("DR=%d->%d\n", _specifiedDecayRate, r));
_decayRate = 0x80LL;
_decayRate *= powtbl[(r&3) << 7];
_decayRate <<= 16 + (r >> 2);
_decayRate >>= 1;
_decayRate /= 124LL; // r == 4 のとき、0-96db が 123985.92ms
r = _specifiedSustainRate;
if (r != 0) {
r = r * 2 + (keyscaleTable[freq/262205] >> (3-_keyScale));
if (r >= 64) {
r = 63;
}
}
//DB(("SR=%d->%d\n", _specifiedSustainRate, r));
_sustainRate = 0x80LL;
_sustainRate *= powtbl[(r&3) << 7];
_sustainRate <<= 16 + (r >> 2);
_sustainRate >>= 1;
_sustainRate /= 124LL;
r = _specifiedReleaseRate;
if (r != 0) {
r = r * 2 + 1; // このタイミングで良いのかわからん
r = r * 2 + (keyscaleTable[freq/262205] >> (3-_keyScale));
// KS による補正はあるらしい。赤p.206 では記述されてないけど。
if (r >= 64) {
r = 63;
}
}
//DB(("RR=%d->%d\n", _specifiedReleaseRate, r));
_releaseRate = 0x80LL;
_releaseRate *= powtbl[(r&3) << 7];
_releaseRate <<= 16 + (r >> 2);
_releaseRate >>= 1;
_releaseRate /= 124LL;
}
int TownsFmEmulator_Operator::nextTick(int rate, int phaseShift)
{
// sampling ひとつ分進める
if (_oldState != _state) {
//DB(("state %d -> %d\n", _oldState, _state));
//DB(("(currentLevel = %08x %08x)\n", (int)(_currentLevel>>32), (int)(_currentLevel)));
switch (_oldState) {
default:
break;
};
_oldState = _state;
}
switch (_state) {
case _s_ready:
return 0;
break;
case _s_attacking:
++_tickCount;
if (_attackTime <= 0) {
_currentLevel = 0LL;
_state = _s_decaying;
}
else {
int i = (static_cast<int64_t>(_tickCount) << (12+10)) / (static_cast<int64_t>(rate * _attackTime));
if (i >= 1024) {
_currentLevel = 0LL;
_state = _s_decaying;
}
else {
_currentLevel = attackOut[i];
_currentLevel <<= 31 - 8;
//DB(("this=%08x, count=%d, time=%d, i=%d, out=%04x\n", this, _tickCount, _attackTime, i, attackOut[i]));
}
}
break;
case _s_decaying:
_currentLevel += _decayRate / rate;
if (_currentLevel >= _sustainLevel) {
_currentLevel = _sustainLevel;
_state = _s_sustaining;
}
break;
case _s_sustaining:
_currentLevel += _sustainRate / rate;
if (_currentLevel >= (0x7fLL << 31)) {
_currentLevel = 0x7fLL << 31;
_state = _s_ready;
}
break;
case _s_releasing:
_currentLevel += _releaseRate / rate;
if (_currentLevel >= (0x7fLL << 31)) {
_currentLevel = 0x7fLL << 31;
_state = _s_ready;
}
break;
default:
// ここには来ないはず
break;
};
int64_t level = _currentLevel + _totalLevel;
int64_t output = 0LL;
if (level < (0x7fLL << 31)) {
int const feedback[8] = {
0,
0x400 / 16,
0x400 / 8,
0x400 / 4,
0x400 / 2,
0x400,
0x400 * 2,
0x400 * 4,
};
_phase &= 0x3ffff;
phaseShift >>= 2; // 正しい変調量は? 3 じゃ小さすぎで 2 じゃ大きいような。
phaseShift += (_lastOutput * feedback[_feedbackLevel & 7]) >> 16; // 正しい変調量は? 16から17の間のようだけど。
output = sintbl[((_phase >> 7) + phaseShift) & 0x7ff];
output >>= (level >> 34); // 正しい減衰量は?
output *= powtbl[511 - ((level>>25)&511)];
output >>= 16;
output >>= 1;
if (_multiple > 0) {
_phase += (_frequency * _multiple) / rate;
}
else {
_phase += _frequency / (rate << 1);
}
}
_lastOutput = static_cast<int>(output);
return static_cast<int>(output);
}
/* TownsFmEmulator */
TownsFmEmulator::TownsFmEmulator()
{
_chn_volume = 127;
_expression = 127;
_offVelocity = 0;
_gateTime = 0;
_note = 40;
_frequency = 440;
_frequencyOffs = 0x2000;
_algorithm = 7;
_opr = new TownsFmEmulator_Operator[_numOfOperators];
_enableL = _enableR = 1;
this->velocity(0);
}
TownsFmEmulator::~TownsFmEmulator()
{
delete [] _opr;
}
void TownsFmEmulator::velocity(int velo)
{
EUP_TownsEmulator_MonophonicAudioSynthesizer::velocity(velo);
int v = velo + (_chn_volume - 127) * 4;
bool iscarrier[8][4] = {
{ false, false, false, true, }, /*0*/
{ false, false, false, true, }, /*1*/
{ false, false, false, true, }, /*2*/
{ false, false, false, true, }, /*3*/
{ false, true, false, true, }, /*4*/
{ false, true, true, true, }, /*5*/
{ false, true, true, true, }, /*6*/
{ true, true, true, true, }, /*7*/
};
for (int opr = 0; opr < 4; opr++)
if (iscarrier[_algorithm][opr]) {
_opr[opr].velocity(v);
}
else {
_opr[opr].velocity(127);
}
}
void TownsFmEmulator::setControlParameter(int control, int value)
{
switch (control) {
case 0:
// Bank Select (for devices with more than 128 programs)
// base for "program change" commands
if (value > 0) {
fprintf(stderr, "warning: unsupported Bank Select: %d\n", value);
fflush(stderr);
}
break;
case 1:
// Modulation controls a vibrato effect (pitch, loudness, brighness)
if (value > 0) {
fprintf(stderr, "warning: unsupported Modulation: %d\n", value);
fflush(stderr);
}
break;
case 7:
_chn_volume = value;
this->velocity(this->velocity());
break;
// panpot
case 10:
// Pan (coarse) 0-127
case 42:
// Pan (fine) 0-127
if (value < 0x20) {
_enableL = 1;
_enableR = 0;
}
else if (value < 0x60) {
_enableL = 1;
_enableR = 1;
}
else {
_enableL = 0;
_enableR = 1;
}
break;
case 11:
// Expression (coarse) controllers are for dynamics (i.e., volume). Thus, they work similarly to controllers for volume (e.g., 0x07).
case 43:
// Expression (fine) controllers are for dynamics (i.e., volume). Thus, they work similarly to controllers for volume (e.g., 0x07).
_expression = value;
this->velocity(this->velocity());
if (value != 127) {
fprintf(stderr, "warning: song uses unimplemented Expression control\n");
fflush(stderr);
}
break;
case 64:
// Hold (damper, sustain) pedal 1 (on/off) < 63 is off, >= 64 is on
if (value > 64) {
fprintf(stderr, "warning: use of unimplemented Sustain Pedal: %d\n", value);
fflush(stderr);
}
break;
default:
fprintf(stderr, "TownsFmEmulator::setControlParameter: unknown control %d, val=%d\n", control, value);
fflush(stderr);
break;
};
}
void TownsFmEmulator::setInstrumentParameter(u_char const *fmInst,
u_char const *pcmInst)
{
u_char const *instrument = fmInst;
if (instrument == nullptr) {
fprintf(stderr, "%s@%p: can not set null instrument\n",
"TownsFmEmulator::setInstrumentParameter", this);
fflush(stderr);
return;
}
_algorithm = instrument[32] & 7;
_opr[0].feedbackLevel((instrument[32] >> 3) & 7);
_opr[1].feedbackLevel(0);
_opr[2].feedbackLevel(0);
_opr[3].feedbackLevel(0);
_opr[0].setInstrumentParameter(instrument + 0);
_opr[1].setInstrumentParameter(instrument + 2);
_opr[2].setInstrumentParameter(instrument + 1);
_opr[3].setInstrumentParameter(instrument + 3);
}
void TownsFmEmulator::nextTick(int *outbuf, int buflen)
{
// steptime ひとつ分進める
if (_gateTime > 0) {
if (--_gateTime <= 0) {
this->velocity(_offVelocity);
for (int i = 0; i < _numOfOperators; i++) {
_opr[i].keyOff();
}
}
}
if (this->velocity() == 0) {
return;
}
for (int i = 0; i < buflen; i++) {
int d = 0;
int d1, d2, d3, d4;
switch (_algorithm) {
case 0:
d1 = _opr[0].nextTick(this->rate(), 0);
d2 = _opr[1].nextTick(this->rate(), d1);
d3 = _opr[2].nextTick(this->rate(), d2);
d4 = _opr[3].nextTick(this->rate(), d3);
d = d4;
break;
case 1:
d1 = _opr[0].nextTick(this->rate(), 0);
d2 = _opr[1].nextTick(this->rate(), 0);
d3 = _opr[2].nextTick(this->rate(), d1 + d2);
d4 = _opr[3].nextTick(this->rate(), d3);
d = d4;
break;
case 2:
d1 = _opr[0].nextTick(this->rate(), 0);
d2 = _opr[1].nextTick(this->rate(), 0);
d3 = _opr[2].nextTick(this->rate(), d2);
d4 = _opr[3].nextTick(this->rate(), d1 + d3);
d = d4;
break;
case 3:
d1 = _opr[0].nextTick(this->rate(), 0);
d2 = _opr[1].nextTick(this->rate(), d1);
d3 = _opr[2].nextTick(this->rate(), 0);
d4 = _opr[3].nextTick(this->rate(), d2 + d3);
d = d4;
break;
case 4:
d1 = _opr[0].nextTick(this->rate(), 0);
d2 = _opr[1].nextTick(this->rate(), d1);
d3 = _opr[2].nextTick(this->rate(), 0);
d4 = _opr[3].nextTick(this->rate(), d3);
d = d2 + d4;
break;
case 5:
d1 = _opr[0].nextTick(this->rate(), 0);
d2 = _opr[1].nextTick(this->rate(), d1);
d3 = _opr[2].nextTick(this->rate(), d1);
d4 = _opr[3].nextTick(this->rate(), d1);
d = d2 + d3 + d4;
break;
case 6:
d1 = _opr[0].nextTick(this->rate(), 0);
d2 = _opr[1].nextTick(this->rate(), d1);
d3 = _opr[2].nextTick(this->rate(), 0);
d4 = _opr[3].nextTick(this->rate(), 0);
d = d2 + d3 + d4;
break;
case 7:
d1 = _opr[0].nextTick(this->rate(), 0);
d2 = _opr[1].nextTick(this->rate(), 0);
d3 = _opr[2].nextTick(this->rate(), 0);
d4 = _opr[3].nextTick(this->rate(), 0);
d = d1 + d2 + d3 + d4;
break;
default:
break;
};
if (2 == streamAudioChannelsNum) {
int j = 2 * i;
outbuf[j++] += (_enableL ? d : 0);
outbuf[j] += (_enableR ? d : 0);
}
else /*(1 == streamAudioChannelsNum)*/ {
outbuf[i] += d;
}
}
}
void TownsFmEmulator::note(int n, int onVelo, int offVelo, int gateTime)
{
_note = n;
this->velocity(onVelo);
_offVelocity = offVelo;
_gateTime = gateTime;
this->recalculateFrequency();
for (int i = 0; i < _numOfOperators; i++) {
_opr[i].keyOn();
}
}
void TownsFmEmulator::pitchBend(int value)
{
_frequencyOffs = value;
this->recalculateFrequency();
}
void TownsFmEmulator::recalculateFrequency()
{
// MIDI とも違うし....
// どういう仕様なんだろうか?
// と思ったら、なんと、これ (↓) が正解らしい。
int64_t basefreq = frequencyTable[_note];
double basefreq_double = static_cast<double>(basefreq);
int lcl_frequencyOffs = _frequencyOffs;
if (lcl_frequencyOffs > 0x4000) {
lcl_frequencyOffs = 0x4000;
}
if (lcl_frequencyOffs < 0x0000) {
lcl_frequencyOffs = 0x0000;
}
double Offs_double = pow(2.0, (static_cast<double>(lcl_frequencyOffs - 8192/*0x2000*/) / static_cast<double>(8192/*0x2000*/)));
basefreq_double *= Offs_double;
int cfreq = frequencyTable[_note - (_note % 12)];
int oct = _note / 12;
int fnum = static_cast<int>((basefreq << 13) / cfreq); // OPL の fnum と同じようなもの。
//fnum += _frequencyOffs - 0x2000;
//if (fnum < 0x2000) {
// fnum += 0x2000;
// oct--;
//}
//if (fnum >= 0x4000) {
// fnum -= 0x2000;
// oct++;
//}
// _frequency は最終的にバイアス 256*1024 倍
_frequency = (static_cast<int64_t>(frequencyTable[oct*12]) * static_cast<int64_t>(fnum)) >> (13 - 10);
for (int i = 0; i < _numOfOperators; i++) {
_opr[i].frequency(_frequency);
}
}
/* TownsPcmEmulator */
TownsPcmEmulator::TownsPcmEmulator()
{
_chn_volume = 127;
_expression = 127;
this->velocity(0);
_gateTime = 0;
_frequencyOffs = 0x2000;
_currentInstrument = nullptr;
_currentEnvelope = nullptr;
_currentSound = nullptr;
_volL = _volR = 0x10; // correctly only 0xf - but let's keep it shift friendly
}
TownsPcmEmulator::~TownsPcmEmulator()
{
}
void TownsPcmEmulator::setControlParameter(int control, int value)
{
switch (control) {
case 0:
// Bank Select (for devices with more than 128 programs)
// base for "program change" commands
if (value > 0) {
fprintf(stderr, "warning: unsupported Bank Select: %d\n", value);
fflush(stderr);
}
break;
case 1:
// Modulation controls a vibrato effect (pitch, loudness, brighness)
if (value > 0) {
fprintf(stderr, "warning: unsupported Modulation: %d\n", value);
fflush(stderr);
}
break;
case 7:
_chn_volume = value;
break;
case 10:
// Pan (coarse) 0-127
case 42:
// Pan (fine) 0-127
// panpot - rf5c68 seems to have an 8-bit pan register where low-nibble controls output to left