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VGM export: add "trailing ticks" option

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issue #695
This commit is contained in:
tildearrow 2023-02-08 19:25:03 -05:00
parent 0a63399dcf
commit 2343cdecc5
5 changed files with 93 additions and 9 deletions
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68
src/engine/vgmOps.cpp
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@ -952,7 +952,7 @@ 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) {
SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool patternHints, bool directStream, int trailingTicks) {
if (version<0x150) {
lastError="VGM version is too low";
return NULL;
@ -1037,7 +1037,8 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
int chipAccounting=0;
int loopPos=-1;
int loopTick=-1;
int loopTickSong=-1;
int songTick=0;
unsigned int sampleOff8[256];
unsigned int sampleOffSegaPCM[256];
@ -1063,6 +1064,11 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
std::vector<DivDelayedWrite> delayedWrites[DIV_MAX_CHIPS];
std::vector<std::pair<int,DivDelayedWrite>> sortedWrites;
std::vector<size_t> tickPos;
std::vector<int> tickSample;
bool trailing=false;
bool beenOneLoopAlready=false;
int countDown=MAX(0,trailingTicks)+1;
for (int i=0; i<DIV_MAX_CHANS; i++) {
loopTimer[i]=0;
@ -2103,11 +2109,14 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
playSub(false);
size_t tickCount=0;
bool writeLoop=false;
bool alreadyWroteLoop=false;
int ord=-1;
int exportChans=0;
for (int i=0; i<chans; i++) {
if (!willExport[dispatchOfChan[i]]) continue;
exportChans++;
chan[i].wentThroughNote=false;
chan[i].goneThroughNote=false;
}
while (!done) {
if (loopPos==-1) {
@ -2115,8 +2124,45 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
writeLoop=true;
}
}
songTick++;
tickPos.push_back(w->tell());
if (nextTick(false,true) || !playing) {
tickSample.push_back(tickCount);
if (nextTick(false,true)) {
if (trailing) beenOneLoopAlready=true;
trailing=true;
for (int i=0; i<chans; i++) {
if (!willExport[dispatchOfChan[i]]) continue;
chan[i].wentThroughNote=false;
}
}
if (trailing) {
switch (trailingTicks) {
case -1: { // automatic
bool stillHaveTo=false;
for (int i=0; i<chans; i++) {
if (!willExport[dispatchOfChan[i]]) continue;
if (!chan[i].goneThroughNote) continue;
if (!chan[i].wentThroughNote) {
stillHaveTo=true;
break;
}
}
if (!stillHaveTo) countDown=0;
break;
}
case -2: // one loop
break;
default: // custom
countDown--;
break;
}
if (song.loopModality!=2) countDown=0;
if (countDown>0 && !beenOneLoopAlready) {
loopTickSong++;
}
}
if (countDown<=0 || !playing || beenOneLoopAlready) {
done=true;
if (!loop) {
for (int i=0; i<song.systemLen; i++) {
@ -2275,10 +2321,11 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
}
tickCount+=totalWait;
}
if (writeLoop) {
if (writeLoop && !alreadyWroteLoop) {
writeLoop=false;
alreadyWroteLoop=true;
loopPos=w->tell();
loopTick=tickCount;
loopTickSong=songTick;
}
}
// end of song
@ -2333,9 +2380,16 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
if (loopPos==-1) {
w->writeI(0);
w->writeI(0);
} else if (loopTickSong<0 || loopTickSong>(int)tickPos.size()) {
logW("loopTickSong out of range! %d>%d",loopTickSong,(int)tickPos.size());
w->writeI(0);
w->writeI(0);
} else {
w->writeI(loopPos-0x1c);
w->writeI(tickCount-loopTick);
int realLoopTick=tickSample[loopTickSong];
int realLoopPos=tickPos[loopTickSong];
logI("tickCount-realLoopTick: %d. realLoopPos: %d",tickCount-realLoopTick,realLoopPos);
w->writeI(realLoopPos-0x1c);
w->writeI(tickCount-realLoopTick);
}
} else {
w->writeI(0);