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prepare for proper center rate

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the correct rate is 8372Hz rather than 8363Hz
sadly this will require a compat flag so I am not making this change
effective until 0.7

issue #2347
This commit is contained in:
tildearrow 2025-02-06 02:14:21 -05:00
parent b95f9885a4
commit 9dee51851f
39 changed files with 57 additions and 46 deletions
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6
src/engine/platform/opl.cpp
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@ -1004,7 +1004,7 @@ void DivPlatformOPL::acquire(short** buf, size_t len) {
double DivPlatformOPL::NOTE_ADPCMB(int note) {
if (adpcmChan<0) return 0;
if (chan[adpcmChan].sample>=0 && chan[adpcmChan].sample<parent->song.sampleLen) {
double off=65535.0*(double)(parent->getSample(chan[adpcmChan].sample)->centerRate)/8363.0;
double off=65535.0*(double)(parent->getSample(chan[adpcmChan].sample)->centerRate)/parent->getCenterRate();
return parent->calcBaseFreq((double)chipClock/(compatYPitch?144:72),off,note,false);
}
return 0;
@ -1334,7 +1334,7 @@ void DivPlatformOPL::tick(bool sysTick) {
}
if (chan[adpcmChan].freqChanged || chan[adpcmChan].keyOn || chan[adpcmChan].keyOff) {
if (chan[adpcmChan].sample>=0 && chan[adpcmChan].sample<parent->song.sampleLen) {
double off=65535.0*(double)(parent->getSample(chan[adpcmChan].sample)->centerRate)/8363.0;
double off=65535.0*(double)(parent->getSample(chan[adpcmChan].sample)->centerRate)/parent->getCenterRate();
chan[adpcmChan].freq=parent->calcFreq(chan[adpcmChan].baseFreq,chan[adpcmChan].pitch,chan[adpcmChan].fixedArp?chan[adpcmChan].baseNoteOverride:chan[adpcmChan].arpOff,chan[adpcmChan].fixedArp,false,4,chan[adpcmChan].pitch2,(double)chipClock/(compatYPitch?144:72),off);
} else {
chan[adpcmChan].freq=0;
@ -1384,7 +1384,7 @@ void DivPlatformOPL::tick(bool sysTick) {
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
DivSample* s=parent->getSample(chan[i].sample);
unsigned char ctrl=0;
double off=(s->centerRate>=1)?((double)s->centerRate/8363.0):1.0;
double off=(s->centerRate>=1)?((double)s->centerRate/parent->getCenterRate()):1.0;
chan[i].freq=(int)(off*parent->calcFreq(chan[i].baseFreq,chan[i].pitch,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,false,2,chan[i].pitch2,chipClock,(524288*768)));
if (chan[i].freq<0x400) chan[i].freq=0x400;
chan[i].freqH=0;