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641 lines
25 KiB
C#
641 lines
25 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using osu.Framework.Extensions;
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using osu.Framework.Logging;
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using osu.Game.Audio;
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using osu.Game.Beatmaps.ControlPoints;
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using osu.Game.Beatmaps.Legacy;
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using osu.Game.Beatmaps.Timing;
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using osu.Game.IO;
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using osu.Game.Rulesets;
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using osu.Game.Rulesets.Objects;
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using osu.Game.Rulesets.Objects.Legacy;
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using osu.Game.Rulesets.Objects.Types;
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namespace osu.Game.Beatmaps.Formats
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{
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public class LegacyBeatmapDecoder : LegacyDecoder<Beatmap>
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{
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/// <summary>
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/// An offset which needs to be applied to old beatmaps (v4 and lower) to correct timing changes that were applied at a game client level.
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/// </summary>
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public const int EARLY_VERSION_TIMING_OFFSET = 24;
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/// <summary>
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/// A small adjustment to the start time of sample control points to account for rounding/precision errors.
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/// </summary>
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/// <remarks>
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/// Compare: https://github.com/peppy/osu-stable-reference/blob/master/osu!/GameplayElements/HitObjects/HitObject.cs#L319
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/// </remarks>
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public const double CONTROL_POINT_LENIENCY = 5;
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internal static RulesetStore? RulesetStore;
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private Beatmap beatmap = null!;
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private ConvertHitObjectParser? parser;
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private LegacySampleBank defaultSampleBank;
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private int defaultSampleVolume = 100;
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public static void Register()
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{
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AddDecoder<Beatmap>(@"osu file format v", m => new LegacyBeatmapDecoder(Parsing.ParseInt(m.Split('v').Last())));
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SetFallbackDecoder<Beatmap>(() => new LegacyBeatmapDecoder());
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}
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/// <summary>
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/// Whether or not beatmap or runtime offsets should be applied. Defaults on; only disable for testing purposes.
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/// </summary>
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public bool ApplyOffsets = true;
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private readonly int offset;
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public LegacyBeatmapDecoder(int version = LATEST_VERSION)
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: base(version)
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{
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if (RulesetStore == null)
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{
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Logger.Log($"A {nameof(RulesetStore)} was not provided via {nameof(Decoder)}.{nameof(RegisterDependencies)}; falling back to default {nameof(AssemblyRulesetStore)}.");
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RulesetStore = new AssemblyRulesetStore();
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}
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offset = FormatVersion < 5 ? EARLY_VERSION_TIMING_OFFSET : 0;
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}
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protected override Beatmap CreateTemplateObject()
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{
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var templateBeatmap = base.CreateTemplateObject();
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templateBeatmap.ControlPointInfo = new LegacyControlPointInfo();
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return templateBeatmap;
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}
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protected override void ParseStreamInto(LineBufferedReader stream, Beatmap beatmap)
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{
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this.beatmap = beatmap;
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this.beatmap.BeatmapInfo.BeatmapVersion = FormatVersion;
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applyLegacyDefaults(this.beatmap.BeatmapInfo);
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base.ParseStreamInto(stream, beatmap);
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applyDifficultyRestrictions(beatmap.Difficulty, beatmap);
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flushPendingPoints();
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// Objects may be out of order *only* if a user has manually edited an .osu file.
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// Unfortunately there are ranked maps in this state (example: https://osu.ppy.sh/s/594828).
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// OrderBy is used to guarantee that the parsing order of hitobjects with equal start times is maintained (stably-sorted)
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// The parsing order of hitobjects matters in mania difficulty calculation
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this.beatmap.HitObjects = this.beatmap.HitObjects.OrderBy(h => h.StartTime).ToList();
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postProcessBreaks(this.beatmap);
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foreach (var hitObject in this.beatmap.HitObjects)
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{
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applyDefaults(hitObject);
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applySamples(hitObject);
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}
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}
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/// <summary>
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/// Ensures that all <see cref="BeatmapDifficulty"/> settings are within the allowed ranges.
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/// See also: https://github.com/peppy/osu-stable-reference/blob/0e425c0d525ef21353c8293c235cc0621d28338b/osu!/GameplayElements/Beatmaps/Beatmap.cs#L567-L614
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/// </summary>
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private static void applyDifficultyRestrictions(BeatmapDifficulty difficulty, Beatmap beatmap)
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{
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difficulty.DrainRate = Math.Clamp(difficulty.DrainRate, 0, 10);
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// mania uses "circle size" for key count, thus different allowable range
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difficulty.CircleSize = beatmap.BeatmapInfo.Ruleset.OnlineID != 3
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? Math.Clamp(difficulty.CircleSize, 0, 10)
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: Math.Clamp(difficulty.CircleSize, 1, 18);
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difficulty.OverallDifficulty = Math.Clamp(difficulty.OverallDifficulty, 0, 10);
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difficulty.ApproachRate = Math.Clamp(difficulty.ApproachRate, 0, 10);
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difficulty.SliderMultiplier = Math.Clamp(difficulty.SliderMultiplier, 0.4, 3.6);
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difficulty.SliderTickRate = Math.Clamp(difficulty.SliderTickRate, 0.5, 8);
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}
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/// <summary>
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/// Processes the beatmap such that a new combo is started the first hitobject following each break.
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/// </summary>
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private static void postProcessBreaks(Beatmap beatmap)
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{
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int currentBreak = 0;
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bool forceNewCombo = false;
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foreach (var h in beatmap.HitObjects.OfType<ConvertHitObject>())
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{
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while (currentBreak < beatmap.Breaks.Count && beatmap.Breaks[currentBreak].EndTime < h.StartTime)
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{
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forceNewCombo = true;
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currentBreak++;
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}
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h.NewCombo |= forceNewCombo;
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forceNewCombo = false;
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}
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}
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private void applyDefaults(HitObject hitObject)
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{
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DifficultyControlPoint difficultyControlPoint = (beatmap.ControlPointInfo as LegacyControlPointInfo)?.DifficultyPointAt(hitObject.StartTime) ?? DifficultyControlPoint.DEFAULT;
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if (hitObject is IHasGenerateTicks hasGenerateTicks)
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hasGenerateTicks.GenerateTicks = difficultyControlPoint.GenerateTicks;
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if (hitObject is IHasSliderVelocity hasSliderVelocity)
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hasSliderVelocity.SliderVelocityMultiplier = difficultyControlPoint.SliderVelocity;
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hitObject.ApplyDefaults(beatmap.ControlPointInfo, beatmap.Difficulty);
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}
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private void applySamples(HitObject hitObject)
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{
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if (hitObject is IHasRepeats hasRepeats)
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{
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SampleControlPoint sampleControlPoint = (beatmap.ControlPointInfo as LegacyControlPointInfo)?.SamplePointAt(hitObject.StartTime + CONTROL_POINT_LENIENCY + 1) ?? SampleControlPoint.DEFAULT;
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hitObject.Samples = hitObject.Samples.Select(o => sampleControlPoint.ApplyTo(o)).ToList();
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for (int i = 0; i < hasRepeats.NodeSamples.Count; i++)
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{
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double time = hitObject.StartTime + i * hasRepeats.Duration / hasRepeats.SpanCount() + CONTROL_POINT_LENIENCY;
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var nodeSamplePoint = (beatmap.ControlPointInfo as LegacyControlPointInfo)?.SamplePointAt(time) ?? SampleControlPoint.DEFAULT;
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hasRepeats.NodeSamples[i] = hasRepeats.NodeSamples[i].Select(o => nodeSamplePoint.ApplyTo(o)).ToList();
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}
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}
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else
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{
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SampleControlPoint sampleControlPoint = (beatmap.ControlPointInfo as LegacyControlPointInfo)?.SamplePointAt(hitObject.GetEndTime() + CONTROL_POINT_LENIENCY) ?? SampleControlPoint.DEFAULT;
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hitObject.Samples = hitObject.Samples.Select(o => sampleControlPoint.ApplyTo(o)).ToList();
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}
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}
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/// <summary>
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/// Some `BeatmapInfo` members have default values that differ from the default values used by stable.
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/// In addition, legacy beatmaps will sometimes not contain some configuration keys, in which case
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/// the legacy default values should be used.
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/// This method's intention is to restore those legacy defaults.
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/// See also: https://osu.ppy.sh/wiki/en/Client/File_formats/Osu_%28file_format%29
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/// </summary>
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private static void applyLegacyDefaults(BeatmapInfo beatmapInfo)
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{
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beatmapInfo.WidescreenStoryboard = false;
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beatmapInfo.SamplesMatchPlaybackRate = false;
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}
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protected override void ParseLine(Beatmap beatmap, Section section, string line)
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{
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switch (section)
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{
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case Section.General:
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handleGeneral(line);
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return;
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case Section.Editor:
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handleEditor(line);
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return;
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case Section.Metadata:
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handleMetadata(line);
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return;
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case Section.Difficulty:
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handleDifficulty(line);
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return;
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case Section.Events:
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handleEvent(line);
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return;
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case Section.TimingPoints:
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handleTimingPoint(line);
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return;
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case Section.HitObjects:
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handleHitObject(line);
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return;
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}
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base.ParseLine(beatmap, section, line);
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}
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private void handleGeneral(string line)
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{
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var pair = SplitKeyVal(line);
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var metadata = beatmap.BeatmapInfo.Metadata;
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switch (pair.Key)
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{
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case @"AudioFilename":
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metadata.AudioFile = pair.Value.ToStandardisedPath();
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break;
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case @"AudioLeadIn":
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beatmap.BeatmapInfo.AudioLeadIn = Parsing.ParseInt(pair.Value);
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break;
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case @"PreviewTime":
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int time = Parsing.ParseInt(pair.Value);
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metadata.PreviewTime = time == -1 ? time : getOffsetTime(time);
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break;
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case @"SampleSet":
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defaultSampleBank = Enum.Parse<LegacySampleBank>(pair.Value);
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break;
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case @"SampleVolume":
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defaultSampleVolume = Parsing.ParseInt(pair.Value);
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break;
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case @"StackLeniency":
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beatmap.BeatmapInfo.StackLeniency = Parsing.ParseFloat(pair.Value);
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break;
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case @"Mode":
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int rulesetID = Parsing.ParseInt(pair.Value);
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beatmap.BeatmapInfo.Ruleset = RulesetStore?.GetRuleset(rulesetID) ?? throw new ArgumentException("Ruleset is not available locally.");
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switch (rulesetID)
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{
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case 0:
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parser = new Rulesets.Objects.Legacy.Osu.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
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break;
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case 1:
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parser = new Rulesets.Objects.Legacy.Taiko.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
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break;
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case 2:
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parser = new Rulesets.Objects.Legacy.Catch.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
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break;
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case 3:
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parser = new Rulesets.Objects.Legacy.Mania.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
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break;
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}
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break;
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case @"LetterboxInBreaks":
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beatmap.BeatmapInfo.LetterboxInBreaks = Parsing.ParseInt(pair.Value) == 1;
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break;
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case @"SpecialStyle":
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beatmap.BeatmapInfo.SpecialStyle = Parsing.ParseInt(pair.Value) == 1;
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break;
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case @"WidescreenStoryboard":
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beatmap.BeatmapInfo.WidescreenStoryboard = Parsing.ParseInt(pair.Value) == 1;
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break;
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case @"EpilepsyWarning":
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beatmap.BeatmapInfo.EpilepsyWarning = Parsing.ParseInt(pair.Value) == 1;
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break;
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case @"SamplesMatchPlaybackRate":
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beatmap.BeatmapInfo.SamplesMatchPlaybackRate = Parsing.ParseInt(pair.Value) == 1;
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break;
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case @"Countdown":
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beatmap.BeatmapInfo.Countdown = Enum.Parse<CountdownType>(pair.Value);
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break;
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case @"CountdownOffset":
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beatmap.BeatmapInfo.CountdownOffset = Parsing.ParseInt(pair.Value);
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break;
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}
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}
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private void handleEditor(string line)
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{
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var pair = SplitKeyVal(line);
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switch (pair.Key)
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{
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case @"Bookmarks":
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beatmap.BeatmapInfo.Bookmarks = pair.Value.Split(',').Select(v =>
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{
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bool result = int.TryParse(v, out int val);
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return new { result, val };
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}).Where(p => p.result).Select(p => p.val).ToArray();
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break;
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case @"DistanceSpacing":
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beatmap.BeatmapInfo.DistanceSpacing = Math.Max(0, Parsing.ParseDouble(pair.Value));
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break;
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case @"BeatDivisor":
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beatmap.BeatmapInfo.BeatDivisor = Parsing.ParseInt(pair.Value);
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break;
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case @"GridSize":
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beatmap.BeatmapInfo.GridSize = Parsing.ParseInt(pair.Value);
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break;
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case @"TimelineZoom":
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beatmap.BeatmapInfo.TimelineZoom = Math.Max(0, Parsing.ParseDouble(pair.Value));
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break;
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}
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}
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private void handleMetadata(string line)
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{
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var pair = SplitKeyVal(line);
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var metadata = beatmap.BeatmapInfo.Metadata;
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switch (pair.Key)
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{
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case @"Title":
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metadata.Title = pair.Value;
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break;
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case @"TitleUnicode":
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metadata.TitleUnicode = pair.Value;
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break;
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case @"Artist":
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metadata.Artist = pair.Value;
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break;
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case @"ArtistUnicode":
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metadata.ArtistUnicode = pair.Value;
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break;
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case @"Creator":
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metadata.Author.Username = pair.Value;
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break;
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case @"Version":
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beatmap.BeatmapInfo.DifficultyName = pair.Value;
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break;
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case @"Source":
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metadata.Source = pair.Value;
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break;
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case @"Tags":
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metadata.Tags = pair.Value;
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break;
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case @"BeatmapID":
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beatmap.BeatmapInfo.OnlineID = Parsing.ParseInt(pair.Value);
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break;
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case @"BeatmapSetID":
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beatmap.BeatmapInfo.BeatmapSet = new BeatmapSetInfo { OnlineID = Parsing.ParseInt(pair.Value) };
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break;
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}
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}
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private void handleDifficulty(string line)
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{
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var pair = SplitKeyVal(line);
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var difficulty = beatmap.Difficulty;
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switch (pair.Key)
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{
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case @"HPDrainRate":
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difficulty.DrainRate = Parsing.ParseFloat(pair.Value);
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break;
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case @"CircleSize":
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difficulty.CircleSize = Parsing.ParseFloat(pair.Value);
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break;
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case @"OverallDifficulty":
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difficulty.OverallDifficulty = Parsing.ParseFloat(pair.Value);
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if (!hasApproachRate)
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difficulty.ApproachRate = difficulty.OverallDifficulty;
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break;
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case @"ApproachRate":
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difficulty.ApproachRate = Parsing.ParseFloat(pair.Value);
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hasApproachRate = true;
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break;
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case @"SliderMultiplier":
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difficulty.SliderMultiplier = Parsing.ParseDouble(pair.Value);
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break;
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case @"SliderTickRate":
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difficulty.SliderTickRate = Parsing.ParseDouble(pair.Value);
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break;
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}
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}
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private void handleEvent(string line)
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{
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string[] split = line.Split(',');
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// Until we have full storyboard encoder coverage, let's track any lines which aren't handled
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// and store them to a temporary location such that they aren't lost on editor save / export.
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bool lineSupportedByEncoder = false;
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if (Enum.TryParse(split[0], out LegacyEventType type))
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{
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switch (type)
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{
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case LegacyEventType.Sprite:
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// Generally, the background is the first thing defined in a beatmap file.
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// In some older beatmaps, it is not present and replaced by a storyboard-level background instead.
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// Allow the first sprite (by file order) to act as the background in such cases.
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if (string.IsNullOrEmpty(beatmap.BeatmapInfo.Metadata.BackgroundFile))
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{
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beatmap.BeatmapInfo.Metadata.BackgroundFile = CleanFilename(split[3]);
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lineSupportedByEncoder = true;
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}
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break;
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case LegacyEventType.Video:
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string filename = CleanFilename(split[2]);
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// Some very old beatmaps had incorrect type specifications for their backgrounds (ie. using 1 for VIDEO
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// instead of 0 for BACKGROUND). To handle this gracefully, check the file extension against known supported
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// video extensions and handle similar to a background if it doesn't match.
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if (!OsuGameBase.VIDEO_EXTENSIONS.Contains(Path.GetExtension(filename).ToLowerInvariant()))
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{
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beatmap.BeatmapInfo.Metadata.BackgroundFile = filename;
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lineSupportedByEncoder = true;
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}
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break;
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case LegacyEventType.Background:
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beatmap.BeatmapInfo.Metadata.BackgroundFile = CleanFilename(split[2]);
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lineSupportedByEncoder = true;
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break;
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case LegacyEventType.Break:
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double start = getOffsetTime(Parsing.ParseDouble(split[1]));
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double end = Math.Max(start, getOffsetTime(Parsing.ParseDouble(split[2])));
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beatmap.Breaks.Add(new BreakPeriod(start, end));
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lineSupportedByEncoder = true;
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break;
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}
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}
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if (!lineSupportedByEncoder)
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beatmap.UnhandledEventLines.Add(line);
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}
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private void handleTimingPoint(string line)
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{
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string[] split = line.Split(',');
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double time = getOffsetTime(Parsing.ParseDouble(split[0].Trim()));
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// beatLength is allowed to be NaN to handle an edge case in which some beatmaps use NaN slider velocity to disable slider tick generation (see LegacyDifficultyControlPoint).
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double beatLength = Parsing.ParseDouble(split[1].Trim(), allowNaN: true);
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// If beatLength is NaN, speedMultiplier should still be 1 because all comparisons against NaN are false.
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double speedMultiplier = beatLength < 0 ? 100.0 / -beatLength : 1;
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TimeSignature timeSignature = TimeSignature.SimpleQuadruple;
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if (split.Length >= 3)
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timeSignature = split[2][0] == '0' ? TimeSignature.SimpleQuadruple : new TimeSignature(Parsing.ParseInt(split[2]));
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LegacySampleBank sampleSet = defaultSampleBank;
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if (split.Length >= 4)
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sampleSet = (LegacySampleBank)Parsing.ParseInt(split[3]);
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int customSampleBank = 0;
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if (split.Length >= 5)
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customSampleBank = Parsing.ParseInt(split[4]);
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int sampleVolume = defaultSampleVolume;
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if (split.Length >= 6)
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sampleVolume = Parsing.ParseInt(split[5]);
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bool timingChange = true;
|
|
if (split.Length >= 7)
|
|
timingChange = split[6][0] == '1';
|
|
|
|
bool kiaiMode = false;
|
|
bool omitFirstBarSignature = false;
|
|
|
|
if (split.Length >= 8)
|
|
{
|
|
LegacyEffectFlags effectFlags = (LegacyEffectFlags)Parsing.ParseInt(split[7]);
|
|
kiaiMode = effectFlags.HasFlag(LegacyEffectFlags.Kiai);
|
|
omitFirstBarSignature = effectFlags.HasFlag(LegacyEffectFlags.OmitFirstBarLine);
|
|
}
|
|
|
|
string stringSampleSet = sampleSet.ToString().ToLowerInvariant();
|
|
if (stringSampleSet == @"none")
|
|
stringSampleSet = HitSampleInfo.BANK_NORMAL;
|
|
|
|
if (timingChange)
|
|
{
|
|
if (double.IsNaN(beatLength))
|
|
throw new InvalidDataException("Beat length cannot be NaN in a timing control point");
|
|
|
|
var controlPoint = CreateTimingControlPoint();
|
|
|
|
controlPoint.BeatLength = beatLength;
|
|
controlPoint.TimeSignature = timeSignature;
|
|
controlPoint.OmitFirstBarLine = omitFirstBarSignature;
|
|
|
|
addControlPoint(time, controlPoint, true);
|
|
}
|
|
|
|
int onlineRulesetID = beatmap.BeatmapInfo.Ruleset.OnlineID;
|
|
|
|
addControlPoint(time, new DifficultyControlPoint
|
|
{
|
|
GenerateTicks = !double.IsNaN(beatLength),
|
|
SliderVelocity = speedMultiplier,
|
|
}, timingChange);
|
|
|
|
var effectPoint = new EffectControlPoint
|
|
{
|
|
KiaiMode = kiaiMode,
|
|
};
|
|
|
|
// osu!taiko and osu!mania use effect points rather than difficulty points for scroll speed adjustments.
|
|
if (onlineRulesetID == 1 || onlineRulesetID == 3)
|
|
effectPoint.ScrollSpeed = speedMultiplier;
|
|
|
|
addControlPoint(time, effectPoint, timingChange);
|
|
|
|
addControlPoint(time, new LegacySampleControlPoint
|
|
{
|
|
SampleBank = stringSampleSet,
|
|
SampleVolume = sampleVolume,
|
|
CustomSampleBank = customSampleBank,
|
|
}, timingChange);
|
|
}
|
|
|
|
private readonly List<ControlPoint> pendingControlPoints = new List<ControlPoint>();
|
|
private readonly HashSet<Type> pendingControlPointTypes = new HashSet<Type>();
|
|
private double pendingControlPointsTime;
|
|
private bool hasApproachRate;
|
|
|
|
private void addControlPoint(double time, ControlPoint point, bool timingChange)
|
|
{
|
|
if (time != pendingControlPointsTime)
|
|
flushPendingPoints();
|
|
|
|
if (timingChange)
|
|
pendingControlPoints.Insert(0, point);
|
|
else
|
|
pendingControlPoints.Add(point);
|
|
|
|
pendingControlPointsTime = time;
|
|
}
|
|
|
|
private void flushPendingPoints()
|
|
{
|
|
// Changes from non-timing-points are added to the end of the list (see addControlPoint()) and should override any changes from timing-points (added to the start of the list).
|
|
for (int i = pendingControlPoints.Count - 1; i >= 0; i--)
|
|
{
|
|
var type = pendingControlPoints[i].GetType();
|
|
if (!pendingControlPointTypes.Add(type))
|
|
continue;
|
|
|
|
beatmap.ControlPointInfo.Add(pendingControlPointsTime, pendingControlPoints[i]);
|
|
}
|
|
|
|
pendingControlPoints.Clear();
|
|
pendingControlPointTypes.Clear();
|
|
}
|
|
|
|
private void handleHitObject(string line)
|
|
{
|
|
// If the ruleset wasn't specified, assume the osu!standard ruleset.
|
|
parser ??= new Rulesets.Objects.Legacy.Osu.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
|
|
|
|
var obj = parser.Parse(line);
|
|
|
|
if (obj != null)
|
|
{
|
|
obj.ApplyDefaults(beatmap.ControlPointInfo, beatmap.Difficulty);
|
|
|
|
beatmap.HitObjects.Add(obj);
|
|
}
|
|
}
|
|
|
|
private int getOffsetTime(int time) => time + (ApplyOffsets ? offset : 0);
|
|
|
|
private double getOffsetTime() => ApplyOffsets ? offset : 0;
|
|
|
|
private double getOffsetTime(double time) => time + (ApplyOffsets ? offset : 0);
|
|
|
|
protected virtual TimingControlPoint CreateTimingControlPoint() => new TimingControlPoint();
|
|
}
|
|
}
|