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VGM export: fix NES DPCM

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This commit is contained in:
tildearrow 2025-05-06 15:19:59 -05:00
parent 1cabe743d6
commit defbeae704
2 changed files with 69 additions and 38 deletions
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2
src/engine/engine.h
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@ -583,7 +583,7 @@ class DivEngine {
void processRow(int i, bool afterDelay);
void nextOrder();
void nextRow();
void performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write, int streamOff, double* loopTimer, double* loopFreq, int* loopSample, bool* sampleDir, bool isSecond, int* pendingFreq, int* playingSample, int* setPos, unsigned int* sampleOff8, unsigned int* sampleLen8, size_t bankOffset, bool directStream, bool* sampleStoppable);
void performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write, int streamOff, double* loopTimer, double* loopFreq, int* loopSample, bool* sampleDir, bool isSecond, int* pendingFreq, int* playingSample, int* setPos, unsigned int* sampleOff8, unsigned int* sampleLen8, size_t bankOffset, bool directStream, bool* sampleStoppable, bool dpcm07, DivDispatch** writeNES);
// returns true if end of song.
bool nextTick(bool noAccum=false, bool inhibitLowLat=false);
bool perSystemEffect(int ch, unsigned char effect, unsigned char effectVal);

105
src/engine/vgmOps.cpp
View file

@ -24,7 +24,7 @@
// this function is so long
// may as well make it something else
void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write, int streamOff, double* loopTimer, double* loopFreq, int* loopSample, bool* sampleDir, bool isSecond, int* pendingFreq, int* playingSample, int* setPos, unsigned int* sampleOff8, unsigned int* sampleLen8, size_t bankOffset, bool directStream, bool* sampleStoppable) {
void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write, int streamOff, double* loopTimer, double* loopFreq, int* loopSample, bool* sampleDir, bool isSecond, int* pendingFreq, int* playingSample, int* setPos, unsigned int* sampleOff8, unsigned int* sampleLen8, size_t bankOffset, bool directStream, bool* sampleStoppable, bool dpcm07, DivDispatch** writeNES) {
unsigned char baseAddr1=isSecond?0xa0:0x50;
unsigned char baseAddr2=isSecond?0x80:0;
unsigned short baseAddr2S=isSecond?0x8000:0;
@ -712,19 +712,37 @@ void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write
if (write.addr==0xffff0004) { // switch sample bank
switch (sys) {
case DIV_SYSTEM_NES: {
unsigned int bankAddr=bankOffset+(write.val<<14);
w->writeC(0x68);
w->writeC(0x66);
w->writeC(0x07|(isSecond?0x80:0x00));
w->writeC(bankAddr&0xff);
w->writeC((bankAddr>>8)&0xff);
w->writeC((bankAddr>>16)&0xff);
w->writeC(0x00);
w->writeC(0xc0);
w->writeC(0x00);
w->writeC(0x00);
w->writeC(0x40);
w->writeC(0x00);
if (dpcm07) {
unsigned int bankAddr=bankOffset+(write.val<<14);
w->writeC(0x68);
w->writeC(0x66);
w->writeC(0x07|(isSecond?0x80:0x00));
w->writeC(bankAddr&0xff);
w->writeC((bankAddr>>8)&0xff);
w->writeC((bankAddr>>16)&0xff);
w->writeC(0x00);
w->writeC(0xc0);
w->writeC(0x00);
w->writeC(0x00);
w->writeC(0x40);
w->writeC(0x00);
} else {
// write the whole damn bank.
// this code looks like a mess because it is a hack.
// don't blame me if your VGM ends up being over a gigabyte!
size_t howMuchWillBeWritten=writeNES[isSecond?1:0]->getSampleMemUsage();
// refuse to switch if we're going out of bounds
if ((write.val<<14)>=howMuchWillBeWritten) break;
howMuchWillBeWritten-=(write.val<<14);
if (howMuchWillBeWritten>16384) howMuchWillBeWritten=16384;
w->writeC(0x67);
w->writeC(0x66);
w->writeC(0xc2);
w->writeI(howMuchWillBeWritten+2);
// data
w->writeS(0xc000);
w->write(&(((unsigned char*)writeNES[isSecond?1:0]->getSampleMem())[write.val<<14]),howMuchWillBeWritten);
}
break;
}
default:
@ -2387,28 +2405,41 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
w->write(writeK053260[i]->getSampleMem(),writeK053260[i]->getSampleMemUsage());
}
if (writeNES[i]!=NULL && writeNES[i]->getSampleMemUsage()>0) {
size_t howMuchWillBeWritten=writeNES[i]->getSampleMemUsage();
w->writeC(0x67);
w->writeC(0x66);
w->writeC(7);
w->writeI(howMuchWillBeWritten);
w->write(writeNES[i]->getSampleMem(),howMuchWillBeWritten);
bankOffsetNES[i]=bankOffsetNESCurrent;
bankOffset[writeNESIndex[i]]=bankOffsetNES[i];
bankOffsetNESCurrent+=howMuchWillBeWritten;
// force the first bank
w->writeC(0x68);
w->writeC(0x6c);
w->writeC(0x07|(i?0x80:0x00));
w->writeC(bankOffsetNES[i]&0xff);
w->writeC((bankOffsetNES[i]>>8)&0xff);
w->writeC((bankOffsetNES[i]>>16)&0xff);
w->writeC(0x00);
w->writeC(0xc0);
w->writeC(0x00);
w->writeC(0x00);
w->writeC(0x40);
w->writeC(0x00);
if (dpcm07) {
size_t howMuchWillBeWritten=writeNES[i]->getSampleMemUsage();
w->writeC(0x67);
w->writeC(0x66);
w->writeC(7);
w->writeI(howMuchWillBeWritten);
w->write(writeNES[i]->getSampleMem(),howMuchWillBeWritten);
bankOffsetNES[i]=bankOffsetNESCurrent;
bankOffset[writeNESIndex[i]]=bankOffsetNES[i];
bankOffsetNESCurrent+=howMuchWillBeWritten;
// force the first bank
w->writeC(0x68);
w->writeC(0x6c);
w->writeC(0x07|(i?0x80:0x00));
w->writeC(bankOffsetNES[i]&0xff);
w->writeC((bankOffsetNES[i]>>8)&0xff);
w->writeC((bankOffsetNES[i]>>16)&0xff);
w->writeC(0x00);
w->writeC(0xc0);
w->writeC(0x00);
w->writeC(0x00);
w->writeC(0x40);
w->writeC(0x00);
} else {
// write the first bank
size_t howMuchWillBeWritten=writeNES[i]->getSampleMemUsage();
if (howMuchWillBeWritten>16384) howMuchWillBeWritten=16384;
w->writeC(0x67);
w->writeC(0x66);
w->writeC(0xc2);
w->writeI(howMuchWillBeWritten+2);
// data
w->writeS(0xc000);
w->write(writeNES[i]->getSampleMem(),howMuchWillBeWritten);
}
}
}
@ -2799,7 +2830,7 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
lastOne=i.second.time;
}
// write write
performVGMWrite(w,song.system[i.first],i.second.write,streamIDs[i.first],loopTimer,loopFreq,loopSample,sampleDir,isSecond[i.first],pendingFreq,playingSample,setPos,sampleOff8,sampleLen8,bankOffset[i.first],directStream,sampleStoppable);
performVGMWrite(w,song.system[i.first],i.second.write,streamIDs[i.first],loopTimer,loopFreq,loopSample,sampleDir,isSecond[i.first],pendingFreq,playingSample,setPos,sampleOff8,sampleLen8,bankOffset[i.first],directStream,sampleStoppable,dpcm07,writeNES);
writeCount++;
}
sortedWrites.clear();