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-rw-r--r--backends/midi/ym2612.cpp269
1 files changed, 139 insertions, 130 deletions
diff --git a/backends/midi/ym2612.cpp b/backends/midi/ym2612.cpp
index 0bb8e6ee33..6e4b6b077b 100644
--- a/backends/midi/ym2612.cpp
+++ b/backends/midi/ym2612.cpp
@@ -92,7 +92,7 @@ public:
void keyOn();
void keyOff();
void frequency(int freq);
- int nextTick(uint16 rate, int phaseShift);
+ void nextTick(uint16 rate, const int *phaseShift, int *outbuf, int buflen);
};
class Voice2612 {
@@ -279,6 +279,8 @@ void Operator2612::frequency(int freq) {
value /= 127;
}
_attackTime = (int32) value; // 1 秒 == (1 << 12)
+ if (_attackTime > 0)
+ _attackTime = (1 << (12+10)) / (_owner->_rate * _attackTime);
r = _specifiedDecayRate;
if (r != 0) {
@@ -310,81 +312,106 @@ void Operator2612::frequency(int freq) {
_releaseRate = (int32) value / _owner->_rate;
}
-int Operator2612::nextTick(uint16 rate, int phaseShift) {
- // sampling ひとつ分進める
- switch (_state) {
- case _s_ready:
- return 0;
- break;
- case _s_attacking:
- ++_tickCount;
- if (_attackTime <= 0) {
- _currentLevel = 0;
- _state = _s_decaying;
- } else {
- int i = (int) (((double)_tickCount * (1 << (12+10))) / ((double)rate * _attackTime));
- if (i >= 1024) {
- _currentLevel = 0;
- _state = _s_decaying;
+void Operator2612::nextTick(uint16 rate, const int *phasebuf, int *outbuf, int buflen) {
+ if (_state == _s_ready)
+ return;
+ if (_state == _s_attacking && _attackTime <= 0)
+ _state = _s_decaying;
+
+ int32 increment;
+ int32 target;
+ State next_state;
+ bool switching;
+
+ while (buflen) {
+ switching = false;
+ switch (_state) {
+ case _s_ready:
+ return;
+ break;
+ case _s_attacking:
+ next_state = _s_attacking;
+ break;
+ case _s_decaying:
+ increment = _decayRate;
+ target = _sustainLevel;
+ next_state = _s_sustaining;
+ break;
+ case _s_sustaining:
+ increment = _sustainRate;
+ target = ((int32)0x7f << 15);
+ next_state = _s_ready;
+ break;
+ case _s_releasing:
+ increment = _releaseRate;
+ target = ((int32)0x7f << 15);
+ next_state = _s_ready;
+ break;
+ }
+
+ for (; buflen && !switching; --buflen, ++phasebuf, ++outbuf) {
+ if (next_state == _s_attacking) {
+ // Attack phase
+ ++_tickCount;
+ if (_attackTime <= 0) {
+ _currentLevel = 0;
+ _state = _s_decaying;
+ switching = true;
+ } else {
+ int i = (int) (_tickCount * _attackTime);
+ if (i >= 1024) {
+ _currentLevel = 0;
+ _state = _s_decaying;
+ switching = true;
+ } else {
+ _currentLevel = attackOut[i] << (31 - 8 - 16);
+ }
+ }
} else {
- _currentLevel = attackOut[i] << (31 - 8 - 16);
+ // Decay, Sustain and Release phases
+ _currentLevel += increment;
+ if (_currentLevel >= target) {
+ _currentLevel = target;
+ _state = next_state;
+ switching = true;
+ }
}
- }
- break;
- case _s_decaying:
- _currentLevel += _decayRate;
- if (_currentLevel >= _sustainLevel) {
- _currentLevel = _sustainLevel;
- _state = _s_sustaining;
- }
- break;
- case _s_sustaining:
- _currentLevel += _sustainRate;
- if (_currentLevel >= ((int32)0x7f << 15)) {
- _currentLevel = ((int32)0x7f << 15);
- _state = _s_ready;
- }
- break;
- case _s_releasing:
- _currentLevel += _releaseRate;
- if (_currentLevel >= ((int32)0x7f << 15)) {
- _currentLevel = ((int32)0x7f << 15);
- _state = _s_ready;
- }
- break;
- };
- int32 level = _currentLevel + _totalLevel;
- int32 output = 0;
- if (level < ((int32)0x7f << 15)) {
- _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。
- if (_feedbackLevel)
- phaseShift += (_lastOutput << (_feedbackLevel - 1)) / 1024;
- output = sintbl[((_phase >> 7) + phaseShift) & 0x7ff];
- output >>= (level >> 18); // 正しい減衰量は?
- // Here is the original code, which requires 64-bit ints
-// output *= powtbl[511 - ((level>>25)&511)];
-// output >>= 16;
-// output >>= 1;
- // And here's our 32-bit trick for doing it. (Props to Fingolfin!)
-// int powVal = powtbl[511 - ((level>>9)&511)];
-// int outputHI = output / 256;
-// int powHI = powVal / 256;
-// output = (outputHI * powHI) / 2 + (outputHI * (powVal % 256) + powHI * (output % 256)) / 512;
- // And here's the even faster code.
- output = ((output >> 4) * (powtbl[511-((level>>9)&511)] >> 3)) / 1024;
-
- if (_multiple > 0)
-// _phase += (_frequency * _multiple) / rate;
- _phase += _frequency * _multiple; // / rate; already included
- else
-// _phase += _frequency / (rate << 1);
- _phase += _frequency / 2;
- }
+ int32 level = _currentLevel + _totalLevel;
+ int32 output = 0;
+ if (level < ((int32)0x7f << 15)) {
+ _phase &= 0x3ffff;
+ int phaseShift = *phasebuf >> 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。
+ if (_feedbackLevel)
+ phaseShift += (_lastOutput << (_feedbackLevel - 1)) / 1024;
+ output = sintbl[((_phase >> 7) + phaseShift) & 0x7ff];
+ output >>= (level >> 18); // 正しい減衰量は?
+ // Here is the original code, which requires 64-bit ints
+// output *= powtbl[511 - ((level>>25)&511)];
+// output >>= 16;
+// output >>= 1;
+ // And here's our 32-bit trick for doing it. (Props to Fingolfin!)
+ // Result varies from original code by max of 1.
+// int powVal = powtbl[511 - ((level>>9)&511)];
+// int outputHI = output / 256;
+// int powHI = powVal / 256;
+// output = (outputHI * powHI) / 2 + (outputHI * (powVal % 256) + powHI * (output % 256)) / 512;
+ // And here's the even faster code.
+ // Result varies from original code by max of 8.
+ output = ((output >> 4) * (powtbl[511-((level>>9)&511)] >> 3)) / 1024;
+
+ if (_multiple > 0)
+// _phase += (_frequency * _multiple) / rate;
+ _phase += _frequency * _multiple; // / rate; already included
+ else
+// _phase += _frequency / (rate << 1);
+ _phase += _frequency / 2;
+ }
- _lastOutput = output;
- return output;
+ _lastOutput = output;
+ *outbuf += output;
+ }
+ }
}
////////////////////////////////////////
@@ -467,82 +494,64 @@ void Voice2612::nextTick(int *outbuf, int buflen) {
if (_velocity == 0)
return;
- int i;
- int d1, d2, d3, d4;
+ int *buf1 = (int *) calloc(buflen * 2, sizeof(int));
+ int *buf2 = buf1 + buflen;
+
switch (_algorithm) {
case 0:
- for (i = 0; i < buflen; ++i) {
- d1 = _opr[0]->nextTick(_rate, 0);
- d2 = _opr[1]->nextTick(_rate, d1);
- d3 = _opr[2]->nextTick(_rate, d2);
- d4 = _opr[3]->nextTick(_rate, d3);
- outbuf[i] += d4;
- }
+ _opr[0]->nextTick(_rate, buf1, buf2, buflen);
+ _opr[1]->nextTick(_rate, buf2, buf1, buflen);
+ memset (buf2, 0, sizeof (int) * buflen);
+ _opr[2]->nextTick(_rate, buf1, buf2, buflen);
+ _opr[3]->nextTick(_rate, buf2, outbuf, buflen);
break;
case 1:
- for (i = 0; i < buflen; ++i) {
- d1 = _opr[0]->nextTick(_rate, 0);
- d2 = _opr[1]->nextTick(_rate, 0);
- d3 = _opr[2]->nextTick(_rate, d1+d2);
- d4 = _opr[3]->nextTick(_rate, d3);
- outbuf[i] += d4;
- }
+ _opr[0]->nextTick(_rate, buf1, buf2, buflen);
+ _opr[1]->nextTick(_rate, buf1, buf2, buflen);
+ _opr[2]->nextTick(_rate, buf2, buf1, buflen);
+ _opr[3]->nextTick(_rate, buf1, outbuf, buflen);
break;
case 2:
- for (i = 0; i < buflen; ++i) {
- d1 = _opr[0]->nextTick(_rate, 0);
- d2 = _opr[1]->nextTick(_rate, 0);
- d3 = _opr[2]->nextTick(_rate, d2);
- d4 = _opr[3]->nextTick(_rate, d1+d3);
- outbuf[i] += d4;
- }
+ _opr[1]->nextTick(_rate, buf1, buf2, buflen);
+ _opr[2]->nextTick(_rate, buf2, buf1, buflen);
+ memset(buf2, 0, sizeof(int) * buflen);
+ _opr[0]->nextTick(_rate, buf2, buf1, buflen);
+ _opr[3]->nextTick(_rate, buf1, outbuf, buflen);
break;
case 3:
- for (i = 0; i < buflen; ++i) {
- d1 = _opr[0]->nextTick(_rate, 0);
- d2 = _opr[1]->nextTick(_rate, d1);
- d3 = _opr[2]->nextTick(_rate, 0);
- d4 = _opr[3]->nextTick(_rate, d2+d3);
- outbuf[i] += d4;
- }
+ _opr[0]->nextTick(_rate, buf1, buf2, buflen);
+ _opr[1]->nextTick(_rate, buf2, buf1, buflen);
+ memset(buf2, 0, sizeof(int) * buflen);
+ _opr[2]->nextTick(_rate, buf2, buf1, buflen);
+ _opr[3]->nextTick(_rate, buf1, outbuf, buflen);
break;
case 4:
- for (i = 0; i < buflen; ++i) {
- d1 = _opr[0]->nextTick(_rate, 0);
- d2 = _opr[1]->nextTick(_rate, d1);
- d3 = _opr[2]->nextTick(_rate, 0);
- d4 = _opr[3]->nextTick(_rate, d3);
- outbuf[i] += d2 + d4;
- }
+ _opr[0]->nextTick(_rate, buf1, buf2, buflen);
+ _opr[1]->nextTick(_rate, buf2, outbuf, buflen);
+ _opr[2]->nextTick(_rate, buf1, buf1, buflen);
+ _opr[3]->nextTick(_rate, buf1, outbuf, buflen);
break;
case 5:
- for (i = 0; i < buflen; ++i) {
- d1 = _opr[0]->nextTick(_rate, 0);
- d2 = _opr[1]->nextTick(_rate, d1);
- d3 = _opr[2]->nextTick(_rate, d1);
- d4 = _opr[3]->nextTick(_rate, d1);
- outbuf[i] += d2 + d3 + d4;
- }
+ _opr[0]->nextTick(_rate, buf1, buf2, buflen);
+ _opr[1]->nextTick(_rate, buf2, outbuf, buflen);
+ _opr[2]->nextTick(_rate, buf2, outbuf, buflen);
+ _opr[3]->nextTick(_rate, buf2, outbuf, buflen);
break;
case 6:
- for (i = 0; i < buflen; ++i) {
- d1 = _opr[0]->nextTick(_rate, 0);
- d2 = _opr[1]->nextTick(_rate, d1);
- d3 = _opr[2]->nextTick(_rate, 0);
- d4 = _opr[3]->nextTick(_rate, 0);
- outbuf[i] += d2 + d3 + d4;
- }
+ _opr[0]->nextTick(_rate, buf1, buf2, buflen);
+ _opr[1]->nextTick(_rate, buf2, outbuf, buflen);
+ _opr[2]->nextTick(_rate, buf1, outbuf, buflen);
+ _opr[3]->nextTick(_rate, buf1, outbuf, buflen);
break;
case 7:
- for (i = 0; i < buflen; ++i) {
- d1 = _opr[0]->nextTick(_rate, 0);
- d2 = _opr[1]->nextTick(_rate, 0);
- d3 = _opr[2]->nextTick(_rate, 0);
- d4 = _opr[3]->nextTick(_rate, 0);
- outbuf[i] += d1 + d2 + d3 + d4;
- }
+ _opr[0]->nextTick(_rate, buf1, outbuf, buflen);
+ _opr[1]->nextTick(_rate, buf1, outbuf, buflen);
+ _opr[2]->nextTick(_rate, buf1, outbuf, buflen);
+ _opr[3]->nextTick(_rate, buf1, outbuf, buflen);
break;
};
+
+ free (buf1);
}
void Voice2612::noteOn(int n, int onVelo) {
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-04 05:20:24 +0000