// Copyright (c) ppy Pty Ltd . Licensed under the MIT Licence. // See the LICENCE file in the repository root for full licence text. using System; using System.Collections.Generic; using System.Globalization; using System.IO; using System.Linq; using System.Text; using osu.Game.Audio; using osu.Game.Beatmaps.ControlPoints; using osu.Game.Beatmaps.Legacy; using osu.Game.Rulesets.Objects; using osu.Game.Rulesets.Objects.Legacy; using osu.Game.Rulesets.Objects.Types; using osuTK; namespace osu.Game.Beatmaps.Formats { public class LegacyBeatmapEncoder { public const int LATEST_VERSION = 128; private readonly IBeatmap beatmap; public LegacyBeatmapEncoder(IBeatmap beatmap) { this.beatmap = beatmap; if (beatmap.BeatmapInfo.RulesetID < 0 || beatmap.BeatmapInfo.RulesetID > 3) throw new ArgumentException("Only beatmaps in the osu, taiko, catch, or mania rulesets can be encoded to the legacy beatmap format.", nameof(beatmap)); } public void Encode(TextWriter writer) { writer.WriteLine($"osu file format v{LATEST_VERSION}"); writer.WriteLine(); handleGeneral(writer); writer.WriteLine(); handleEditor(writer); writer.WriteLine(); handleMetadata(writer); writer.WriteLine(); handleDifficulty(writer); writer.WriteLine(); handleEvents(writer); writer.WriteLine(); handleControlPoints(writer); writer.WriteLine(); handleHitObjects(writer); } private void handleGeneral(TextWriter writer) { writer.WriteLine("[General]"); if (beatmap.Metadata.AudioFile != null) writer.WriteLine(FormattableString.Invariant($"AudioFilename: {Path.GetFileName(beatmap.Metadata.AudioFile)}")); writer.WriteLine(FormattableString.Invariant($"AudioLeadIn: {beatmap.BeatmapInfo.AudioLeadIn}")); writer.WriteLine(FormattableString.Invariant($"PreviewTime: {beatmap.Metadata.PreviewTime}")); // Todo: Not all countdown types are supported by lazer yet writer.WriteLine(FormattableString.Invariant($"Countdown: {(beatmap.BeatmapInfo.Countdown ? '1' : '0')}")); writer.WriteLine(FormattableString.Invariant($"SampleSet: {toLegacySampleBank(beatmap.ControlPointInfo.SamplePointAt(double.MinValue).SampleBank)}")); writer.WriteLine(FormattableString.Invariant($"StackLeniency: {beatmap.BeatmapInfo.StackLeniency}")); writer.WriteLine(FormattableString.Invariant($"Mode: {beatmap.BeatmapInfo.RulesetID}")); writer.WriteLine(FormattableString.Invariant($"LetterboxInBreaks: {(beatmap.BeatmapInfo.LetterboxInBreaks ? '1' : '0')}")); // if (beatmap.BeatmapInfo.UseSkinSprites) // writer.WriteLine(@"UseSkinSprites: 1"); // if (b.AlwaysShowPlayfield) // writer.WriteLine(@"AlwaysShowPlayfield: 1"); // if (b.OverlayPosition != OverlayPosition.NoChange) // writer.WriteLine(@"OverlayPosition: " + b.OverlayPosition); // if (!string.IsNullOrEmpty(b.SkinPreference)) // writer.WriteLine(@"SkinPreference:" + b.SkinPreference); // if (b.EpilepsyWarning) // writer.WriteLine(@"EpilepsyWarning: 1"); // if (b.CountdownOffset > 0) // writer.WriteLine(@"CountdownOffset: " + b.CountdownOffset.ToString()); if (beatmap.BeatmapInfo.RulesetID == 3) writer.WriteLine(FormattableString.Invariant($"SpecialStyle: {(beatmap.BeatmapInfo.SpecialStyle ? '1' : '0')}")); writer.WriteLine(FormattableString.Invariant($"WidescreenStoryboard: {(beatmap.BeatmapInfo.WidescreenStoryboard ? '1' : '0')}")); // if (b.SamplesMatchPlaybackRate) // writer.WriteLine(@"SamplesMatchPlaybackRate: 1"); } private void handleEditor(TextWriter writer) { writer.WriteLine("[Editor]"); if (beatmap.BeatmapInfo.Bookmarks.Length > 0) writer.WriteLine(FormattableString.Invariant($"Bookmarks: {string.Join(',', beatmap.BeatmapInfo.Bookmarks)}")); writer.WriteLine(FormattableString.Invariant($"DistanceSpacing: {beatmap.BeatmapInfo.DistanceSpacing}")); writer.WriteLine(FormattableString.Invariant($"BeatDivisor: {beatmap.BeatmapInfo.BeatDivisor}")); writer.WriteLine(FormattableString.Invariant($"GridSize: {beatmap.BeatmapInfo.GridSize}")); writer.WriteLine(FormattableString.Invariant($"TimelineZoom: {beatmap.BeatmapInfo.TimelineZoom}")); } private void handleMetadata(TextWriter writer) { writer.WriteLine("[Metadata]"); writer.WriteLine(FormattableString.Invariant($"Title: {beatmap.Metadata.Title}")); if (beatmap.Metadata.TitleUnicode != null) writer.WriteLine(FormattableString.Invariant($"TitleUnicode: {beatmap.Metadata.TitleUnicode}")); writer.WriteLine(FormattableString.Invariant($"Artist: {beatmap.Metadata.Artist}")); if (beatmap.Metadata.ArtistUnicode != null) writer.WriteLine(FormattableString.Invariant($"ArtistUnicode: {beatmap.Metadata.ArtistUnicode}")); writer.WriteLine(FormattableString.Invariant($"Creator: {beatmap.Metadata.AuthorString}")); writer.WriteLine(FormattableString.Invariant($"Version: {beatmap.BeatmapInfo.Version}")); if (beatmap.Metadata.Source != null) writer.WriteLine(FormattableString.Invariant($"Source: {beatmap.Metadata.Source}")); if (beatmap.Metadata.Tags != null) writer.WriteLine(FormattableString.Invariant($"Tags: {beatmap.Metadata.Tags}")); if (beatmap.BeatmapInfo.OnlineBeatmapID != null) writer.WriteLine(FormattableString.Invariant($"BeatmapID: {beatmap.BeatmapInfo.OnlineBeatmapID}")); if (beatmap.BeatmapInfo.BeatmapSet?.OnlineBeatmapSetID != null) writer.WriteLine(FormattableString.Invariant($"BeatmapSetID: {beatmap.BeatmapInfo.BeatmapSet.OnlineBeatmapSetID}")); } private void handleDifficulty(TextWriter writer) { writer.WriteLine("[Difficulty]"); writer.WriteLine(FormattableString.Invariant($"HPDrainRate: {beatmap.BeatmapInfo.BaseDifficulty.DrainRate}")); writer.WriteLine(FormattableString.Invariant($"CircleSize: {beatmap.BeatmapInfo.BaseDifficulty.CircleSize}")); writer.WriteLine(FormattableString.Invariant($"OverallDifficulty: {beatmap.BeatmapInfo.BaseDifficulty.OverallDifficulty}")); writer.WriteLine(FormattableString.Invariant($"ApproachRate: {beatmap.BeatmapInfo.BaseDifficulty.ApproachRate}")); // Taiko adjusts the slider multiplier (see: TaikoBeatmapConverter.LEGACY_VELOCITY_MULTIPLIER) writer.WriteLine(beatmap.BeatmapInfo.RulesetID == 1 ? FormattableString.Invariant($"SliderMultiplier: {beatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier / 1.4f}") : FormattableString.Invariant($"SliderMultiplier: {beatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier}")); writer.WriteLine(FormattableString.Invariant($"SliderTickRate: {beatmap.BeatmapInfo.BaseDifficulty.SliderTickRate}")); } private void handleEvents(TextWriter writer) { writer.WriteLine("[Events]"); if (!string.IsNullOrEmpty(beatmap.BeatmapInfo.Metadata.BackgroundFile)) writer.WriteLine(FormattableString.Invariant($"{(int)LegacyEventType.Background},0,\"{beatmap.BeatmapInfo.Metadata.BackgroundFile}\",0,0")); foreach (var b in beatmap.Breaks) writer.WriteLine(FormattableString.Invariant($"{(int)LegacyEventType.Break},{b.StartTime},{b.EndTime}")); } private void handleControlPoints(TextWriter writer) { if (beatmap.ControlPointInfo.Groups.Count == 0) return; writer.WriteLine("[TimingPoints]"); foreach (var group in beatmap.ControlPointInfo.Groups) { var groupTimingPoint = group.ControlPoints.OfType().FirstOrDefault(); // If the group contains a timing control point, it needs to be output separately. if (groupTimingPoint != null) { writer.Write(FormattableString.Invariant($"{groupTimingPoint.Time},")); writer.Write(FormattableString.Invariant($"{groupTimingPoint.BeatLength},")); outputControlPointEffectsAt(groupTimingPoint.Time, true); } // Output any remaining effects as secondary non-timing control point. var difficultyPoint = beatmap.ControlPointInfo.DifficultyPointAt(group.Time); writer.Write(FormattableString.Invariant($"{group.Time},")); writer.Write(FormattableString.Invariant($"{-100 / difficultyPoint.SpeedMultiplier},")); outputControlPointEffectsAt(group.Time, false); } void outputControlPointEffectsAt(double time, bool isTimingPoint) { var samplePoint = beatmap.ControlPointInfo.SamplePointAt(time); var effectPoint = beatmap.ControlPointInfo.EffectPointAt(time); // Apply the control point to a hit sample to uncover legacy properties (e.g. suffix) HitSampleInfo tempHitSample = samplePoint.ApplyTo(new ConvertHitObjectParser.LegacyHitSampleInfo()); // Convert effect flags to the legacy format LegacyEffectFlags effectFlags = LegacyEffectFlags.None; if (effectPoint.KiaiMode) effectFlags |= LegacyEffectFlags.Kiai; if (effectPoint.OmitFirstBarLine) effectFlags |= LegacyEffectFlags.OmitFirstBarLine; writer.Write(FormattableString.Invariant($"{(int)beatmap.ControlPointInfo.TimingPointAt(time).TimeSignature},")); writer.Write(FormattableString.Invariant($"{(int)toLegacySampleBank(tempHitSample.Bank)},")); writer.Write(FormattableString.Invariant($"{toLegacyCustomSampleBank(tempHitSample)},")); writer.Write(FormattableString.Invariant($"{tempHitSample.Volume},")); writer.Write(FormattableString.Invariant($"{(isTimingPoint ? '1' : '0')},")); writer.Write(FormattableString.Invariant($"{(int)effectFlags}")); writer.WriteLine(); } } private void handleHitObjects(TextWriter writer) { if (beatmap.HitObjects.Count == 0) return; writer.WriteLine("[HitObjects]"); foreach (var h in beatmap.HitObjects) handleHitObject(writer, h); } private void handleHitObject(TextWriter writer, HitObject hitObject) { Vector2 position = new Vector2(256, 192); switch (beatmap.BeatmapInfo.RulesetID) { case 0: position = ((IHasPosition)hitObject).Position; break; case 2: position.X = ((IHasXPosition)hitObject).X * 512; break; case 3: int totalColumns = (int)Math.Max(1, beatmap.BeatmapInfo.BaseDifficulty.CircleSize); position.X = (int)Math.Ceiling(((IHasXPosition)hitObject).X * (512f / totalColumns)); break; } writer.Write(FormattableString.Invariant($"{position.X},")); writer.Write(FormattableString.Invariant($"{position.Y},")); writer.Write(FormattableString.Invariant($"{hitObject.StartTime},")); writer.Write(FormattableString.Invariant($"{(int)getObjectType(hitObject)},")); writer.Write(FormattableString.Invariant($"{(int)toLegacyHitSoundType(hitObject.Samples)},")); if (hitObject is IHasCurve curveData) { addCurveData(writer, curveData, position); writer.Write(getSampleBank(hitObject.Samples, zeroBanks: true)); } else { if (hitObject is IHasEndTime _) addEndTimeData(writer, hitObject); writer.Write(getSampleBank(hitObject.Samples)); } writer.WriteLine(); } private LegacyHitObjectType getObjectType(HitObject hitObject) { LegacyHitObjectType type = 0; if (hitObject is IHasCombo combo) { type = (LegacyHitObjectType)(combo.ComboOffset << 4); if (combo.NewCombo) type |= LegacyHitObjectType.NewCombo; } switch (hitObject) { case IHasCurve _: type |= LegacyHitObjectType.Slider; break; case IHasEndTime _: if (beatmap.BeatmapInfo.RulesetID == 3) type |= LegacyHitObjectType.Hold; else type |= LegacyHitObjectType.Spinner; break; default: type |= LegacyHitObjectType.Circle; break; } return type; } private void addCurveData(TextWriter writer, IHasCurve curveData, Vector2 position) { PathType? lastType = null; for (int i = 0; i < curveData.Path.ControlPoints.Count; i++) { PathControlPoint point = curveData.Path.ControlPoints[i]; if (point.Type.Value != null) { if (point.Type.Value != lastType) { switch (point.Type.Value) { case PathType.Bezier: writer.Write("B|"); break; case PathType.Catmull: writer.Write("C|"); break; case PathType.PerfectCurve: writer.Write("P|"); break; case PathType.Linear: writer.Write("L|"); break; } lastType = point.Type.Value; } else { // New segment with the same type - duplicate the control point writer.Write(FormattableString.Invariant($"{position.X + point.Position.Value.X}:{position.Y + point.Position.Value.Y}|")); } } if (i != 0) { writer.Write(FormattableString.Invariant($"{position.X + point.Position.Value.X}:{position.Y + point.Position.Value.Y}")); writer.Write(i != curveData.Path.ControlPoints.Count - 1 ? "|" : ","); } } writer.Write(FormattableString.Invariant($"{curveData.RepeatCount + 1},")); writer.Write(FormattableString.Invariant($"{curveData.Path.Distance},")); for (int i = 0; i < curveData.NodeSamples.Count; i++) { writer.Write(FormattableString.Invariant($"{(int)toLegacyHitSoundType(curveData.NodeSamples[i])}")); writer.Write(i != curveData.NodeSamples.Count - 1 ? "|" : ","); } for (int i = 0; i < curveData.NodeSamples.Count; i++) { writer.Write(getSampleBank(curveData.NodeSamples[i], true)); writer.Write(i != curveData.NodeSamples.Count - 1 ? "|" : ","); } } private void addEndTimeData(TextWriter writer, HitObject hitObject) { var endTimeData = (IHasEndTime)hitObject; var type = getObjectType(hitObject); char suffix = ','; // Holds write the end time as if it's part of sample data. if (type == LegacyHitObjectType.Hold) suffix = ':'; writer.Write(FormattableString.Invariant($"{endTimeData.EndTime}{suffix}")); } private string getSampleBank(IList samples, bool banksOnly = false, bool zeroBanks = false) { LegacySampleBank normalBank = toLegacySampleBank(samples.SingleOrDefault(s => s.Name == HitSampleInfo.HIT_NORMAL)?.Bank); LegacySampleBank addBank = toLegacySampleBank(samples.FirstOrDefault(s => !string.IsNullOrEmpty(s.Name) && s.Name != HitSampleInfo.HIT_NORMAL)?.Bank); StringBuilder sb = new StringBuilder(); sb.Append(FormattableString.Invariant($"{(zeroBanks ? 0 : (int)normalBank)}:")); sb.Append(FormattableString.Invariant($"{(zeroBanks ? 0 : (int)addBank)}")); if (!banksOnly) { string customSampleBank = toLegacyCustomSampleBank(samples.FirstOrDefault(s => !string.IsNullOrEmpty(s.Name))); string sampleFilename = samples.FirstOrDefault(s => string.IsNullOrEmpty(s.Name))?.LookupNames.First() ?? string.Empty; int volume = samples.FirstOrDefault()?.Volume ?? 100; sb.Append(":"); sb.Append(FormattableString.Invariant($"{customSampleBank}:")); sb.Append(FormattableString.Invariant($"{volume}:")); sb.Append(FormattableString.Invariant($"{sampleFilename}")); } return sb.ToString(); } private LegacyHitSoundType toLegacyHitSoundType(IList samples) { LegacyHitSoundType type = LegacyHitSoundType.None; foreach (var sample in samples) { switch (sample.Name) { case HitSampleInfo.HIT_WHISTLE: type |= LegacyHitSoundType.Whistle; break; case HitSampleInfo.HIT_FINISH: type |= LegacyHitSoundType.Finish; break; case HitSampleInfo.HIT_CLAP: type |= LegacyHitSoundType.Clap; break; } } return type; } private LegacySampleBank toLegacySampleBank(string sampleBank) { switch (sampleBank?.ToLowerInvariant()) { case "normal": return LegacySampleBank.Normal; case "soft": return LegacySampleBank.Soft; case "drum": return LegacySampleBank.Drum; default: return LegacySampleBank.None; } } private string toLegacyCustomSampleBank(HitSampleInfo hitSampleInfo) { if (hitSampleInfo == null) return "0"; if (hitSampleInfo is ConvertHitObjectParser.LegacyHitSampleInfo legacy) return legacy.CustomSampleBank.ToString(CultureInfo.InvariantCulture); return "0"; } } }