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prevent calcTimestamps from hanging

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when the virtual tempo is 0 or infinity
This commit is contained in:
tildearrow 2026-01-15 04:14:59 -05:00
parent 9ae17062a5
commit 5168c006ef
1 changed files with 9 additions and 3 deletions
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12
src/engine/song.cpp
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@ -351,6 +351,12 @@ void DivSubSong::calcTimestamps(int chans, std::vector<DivGroovePattern>& groove
// MAKE IT WORK
while (!endOfSong) {
// if the virtual tempo nominator is zero, the song will go on forever.
if (curVirtualTempoN<1) {
ts.totalTime.seconds=INT_MAX;
break;
}
// heuristic
int advance=(curVirtualTempoD*ticks)/curVirtualTempoN;
for (int i=0; i<chans; i++) {
@ -376,13 +382,13 @@ void DivSubSong::calcTimestamps(int chans, std::vector<DivGroovePattern>& groove
// run virtual tempo
tempoAccum+=curVirtualTempoN*advance;
while (tempoAccum>=curVirtualTempoD) {
int ticksToRun=tempoAccum/curVirtualTempoD;
tempoAccum%=curVirtualTempoD;
int ticksToRun=tempoAccum/MAX(1,curVirtualTempoD);
tempoAccum%=MAX(1,curVirtualTempoD);
// tick counter
ticks-=ticksToRun;
if (ticks<0) {
// if ticks is negative, we must call ticks back
tempoAccum+=-ticks*curVirtualTempoD;
tempoAccum+=-ticks*MAX(1,curVirtualTempoD);
}
if (ticks<=0) {
if (shallStopSched) {