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Fix inaccurate beat snapping for osu charts. Fix osu charts with too low BPM not able to be imported.

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PopSlime
2023-03-05 20:40:02 +08:00
parent 6d74685cb7
commit 1851bd3c54
3 changed files with 16 additions and 6 deletions
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13
Assets/Cryville/Crtr/Extensions/TimingModel.cs
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@@ -42,15 +42,24 @@ namespace Cryville.Crtr.Extensions {
}
}
public class TimeTimingModel : TimingModel {
public TimeTimingModel(double offset = 0) : base(offset) { }
public readonly double InputTimeAccuracy;
public TimeTimingModel(double accuracy = 2e-3, double offset = 0) : base(offset) {
if (accuracy <= 0) throw new ArgumentOutOfRangeException("accuracy");
InputTimeAccuracy = accuracy;
}
public void ForwardTo(double t) {
if (t == Time) return;
if (BPM == 0) throw new InvalidOperationException("BPM not determined");
BeatTime += (t - Time) * BPM / 60;
int n, d;
FractionUtils.ToFraction(BeatTime, 1f / 48 / BPM * 60, out n, out d);
FractionUtils.ToFraction(BeatTime, Math.Min(1, InputTimeAccuracy * BPM / 60), out n, out d);
FractionalBeatTime = new BeatTime(n, d);
Time = t;
}
public void ForceSnap() {
var alignedBeat = (int)Math.Round(BeatTime);
BeatTime = alignedBeat;
FractionalBeatTime = new BeatTime(alignedBeat, 1);
}
}
}

3
Assets/Cryville/Crtr/Extensions/osu/osuChartConverter.cs
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@@ -108,10 +108,11 @@ namespace Cryville.Crtr.Extensions.osu {
else if (ev is osuEvent.TimingChange) {
var tev = (osuEvent.TimingChange)ev;
if (tm == null) {
tm = new TimeTimingModel(tev.StartTime / 1e3);
tm = new TimeTimingModel(tev.StartTime / 1e3) { InputTimeAccuracy = 2e-3 };
bgmEv.offset = (float)(tev.StartTime / 1e3 + OFFSET);
}
tm.BeatLength = tev.BeatLength / 1e3;
tm.ForceSnap();
chart.sigs.Add(new Chart.Signature {
time = tm.FractionalBeatTime,
tempo = (float)tm.BPM,