Pull up BeatTimeTimingModel.

Assets/Cryville/Crtr/Extensions/Bestdori/BestdoriChartConverter.cs

@@ -36,15 +36,12 @@ namespace Cryville.Crtr.Extensions.Bestdori {
 				motions = new List<Chart.Motion>(),
 				groups = new List<Chart.Group> { group },
 			};
+			var tm = new BeatTimeTimingModel();
 			string bgm = null;
-			double? cbpm = null;
-			double pbeat = 0, ctime = 0;
 			double endbeat = 0;
 			foreach (var ev in src) {
-				double cbeat = ev.StartBeat;
-				ctime += cbpm == null ? 0 : (cbeat - pbeat) / cbpm.Value * 60;
-				pbeat = cbeat;
-				if (cbeat > endbeat) endbeat = cbeat;
+				tm.ForwardTo(ev.StartBeat);
+				if (ev.StartBeat > endbeat) endbeat = ev.StartBeat;
 				if (ev is BestdoriChartEvent.System) {
 					if (bgm != null) continue;
 					var tev = (BestdoriChartEvent.System)ev;
@@ -55,7 +52,7 @@ namespace Cryville.Crtr.Extensions.Bestdori {
 				}
 				else if (ev is BestdoriChartEvent.BPM) {
 					var tev = (BestdoriChartEvent.BPM)ev;
-					cbpm = tev.bpm;
+					tm.BPM = tev.bpm;
 					chart.sigs.Add(new Chart.Signature { time = ToBeatTime(tev.beat), tempo = (float)tev.bpm });
 				}
 				else if (ev is BestdoriChartEvent.Single) {
@@ -95,12 +92,13 @@ namespace Cryville.Crtr.Extensions.Bestdori {
 			}
 			if (bgm == null) throw new FormatException("Chart contains no song");
 			chart.endtime = ToBeatTime(endbeat + 4);
+			if (endbeat > tm.BeatTime) tm.ForwardTo(endbeat);
 			result.Add(new RawChartResource(string.Format("bang_dream_girls_band_party__{0}__{1}", bgm, StringUtils.TrimExt(file.Name)), chart, new ChartMeta {
 				name = string.Format("Bandori {0} {1}", bgm, StringUtils.TrimExt(file.Name)),
 				author = "©BanG Dream! Project ©Craft Egg Inc. ©bushiroad",
 				ruleset = "bang_dream_girls_band_party",
 				note_count = group.notes.Count,
-				length = (float)ctime,
+				length = (float)tm.Time,
 				song = new SongMetaInfo {
 					name = bgm,
 					author = "©BanG Dream! Project ©Craft Egg Inc. ©bushiroad",

Assets/Cryville/Crtr/Extensions/TimingModel.cs

@@ -1,4 +1,6 @@
-namespace Cryville.Crtr.Extensions {
+using Cryville.Common.Math;
+
+namespace Cryville.Crtr.Extensions {
 	public abstract class TimingModel {
 		public double Time { get; protected set; }
 		public double BeatTime { get; protected set; }
@@ -17,4 +19,18 @@
 			BeatTime = nt;
 		}
 	}
+	public class BeatTimeTimingModel : TimingModel {
+		public void ForwardTo(double t) {
+			if (t == BeatTime) return;
+			Time += (t - BeatTime) / BPM * 60;
+			BeatTime = t;
+			FractionalBeatTime = ToBeatTime(t);
+		}
+		BeatTime ToBeatTime(double beat, double error = 1e-4) {
+			int i, n, d;
+			FractionUtils.ToFraction(beat, error, out n, out d);
+			i = n / d; n %= d;
+			return new BeatTime(i, n, d);
+		}
+	}
 }