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VGM export: add speed drift compensation setting

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it appears this is the only way to get exports to play at the correct
speed in DeadFish's VGM player for Genesis
This commit is contained in:
tildearrow 2025-06-06 02:45:59 -05:00
parent 41dcfe8462
commit fe454ee2df
5 changed files with 20 additions and 8 deletions
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4
src/engine/engine.h
View file

@ -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, bool dpcm07, DivDispatch** writeNES);
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, int rateCorrection);
// returns true if end of song.
bool nextTick(bool noAccum=false, bool inhibitLowLat=false);
bool perSystemEffect(int ch, unsigned char effect, unsigned char effectVal);
@ -726,7 +726,7 @@ class DivEngine {
// - x to add x+1 ticks of trailing
// - -1 to auto-determine trailing
// - -2 to add a whole loop of trailing
SafeWriter* saveVGM(bool* sysToExport=NULL, bool loop=true, int version=0x171, bool patternHints=false, bool directStream=false, int trailingTicks=-1, bool dpcm07=false);
SafeWriter* saveVGM(bool* sysToExport=NULL, bool loop=true, int version=0x171, bool patternHints=false, bool directStream=false, int trailingTicks=-1, bool dpcm07=false, int correctedRate=44100);
// dump to TIunA.
SafeWriter* saveTiuna(const bool* sysToExport, const char* baseLabel, int firstBankSize, int otherBankSize);
// dump command stream.

10
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, bool dpcm07, DivDispatch** writeNES) {
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, int rateCorrection) {
unsigned char baseAddr1=isSecond?0xa0:0x50;
unsigned char baseAddr2=isSecond?0x80:0;
unsigned short baseAddr2S=isSecond?0x8000:0;
@ -795,7 +795,7 @@ void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write
break;
case 1: { // set sample freq
sampleStoppable[streamID]=true;
int realFreq=write.val;
int realFreq=(write.val*44100)/rateCorrection;
if (realFreq<0) realFreq=0;
if (realFreq>44100) realFreq=44100;
w->writeC(0x92);
@ -1233,7 +1233,7 @@ void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write
chipVol.push_back((_id)|(0x80000100)|(((unsigned int)_vol)<<16)); \
}
SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool patternHints, bool directStream, int trailingTicks, bool dpcm07) {
SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool patternHints, bool directStream, int trailingTicks, bool dpcm07, int correctedRate) {
if (version<0x150) {
lastError="VGM version is too low";
return NULL;
@ -1243,7 +1243,7 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
setOrder(0);
BUSY_BEGIN_SOFT;
double origRate=got.rate;
got.rate=44100;
got.rate=correctedRate;
// determine loop point
int loopOrder=0;
int loopRow=0;
@ -2840,7 +2840,7 @@ 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,dpcm07,writeNES);
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,correctedRate);
writeCount++;
}
sortedWrites.clear();