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YM2612: add reverse sample playback

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This commit is contained in:
tildearrow 2022-05-27 02:47:44 -05:00
parent 9d6d84a87f
commit 0b7d27dc29
7 changed files with 34 additions and 10 deletions
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13
src/engine/vgmOps.cpp
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@ -24,7 +24,7 @@
constexpr int MASTER_CLOCK_PREC=(sizeof(void*)==8)?8:0;
void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write, int streamOff, double* loopTimer, double* loopFreq, int* loopSample, bool isSecond) {
void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write, int streamOff, double* loopTimer, double* loopFreq, int* loopSample, bool* sampleDir, bool isSecond) {
unsigned char baseAddr1=isSecond?0xa0:0x50;
unsigned char baseAddr2=isSecond?0x80:0;
unsigned short baseAddr2S=isSecond?0x8000:0;
@ -502,8 +502,8 @@ void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write
w->writeC(0x95);
w->writeC(streamID);
w->writeS(write.val); // sample number
w->writeC((sample->loopStart==0)); // flags
if (sample->loopStart>0) {
w->writeC((sample->loopStart==0)|(sampleDir[streamID]?0x10:0)); // flags
if (sample->loopStart>0 && !sampleDir[streamID]) {
loopTimer[streamID]=sample->length8;
loopSample[streamID]=write.val;
}
@ -520,6 +520,9 @@ void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write
w->writeC(streamID);
loopSample[streamID]=-1;
break;
case 3: // set sample direction
sampleDir[streamID]=write.val;
break;
}
return;
}
@ -884,11 +887,13 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version) {
double loopTimer[DIV_MAX_CHANS];
double loopFreq[DIV_MAX_CHANS];
int loopSample[DIV_MAX_CHANS];
bool sampleDir[DIV_MAX_CHANS];
for (int i=0; i<DIV_MAX_CHANS; i++) {
loopTimer[i]=0;
loopFreq[i]=0;
loopSample[i]=-1;
sampleDir[i]=false;
}
bool writeDACSamples=false;
@ -1762,7 +1767,7 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version) {
for (int i=0; i<song.systemLen; i++) {
std::vector<DivRegWrite>& writes=disCont[i].dispatch->getRegisterWrites();
for (DivRegWrite& j: writes) {
performVGMWrite(w,song.system[i],j,streamIDs[i],loopTimer,loopFreq,loopSample,isSecond[i]);
performVGMWrite(w,song.system[i],j,streamIDs[i],loopTimer,loopFreq,loopSample,sampleDir,isSecond[i]);
writeCount++;
}
writes.clear();