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526 lines
19 KiB
C#
526 lines
19 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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#nullable disable
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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.Extensions.EnumExtensions;
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using osu.Framework.Logging;
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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.Legacy;
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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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internal static RulesetStore RulesetStore;
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private Beatmap beatmap;
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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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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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foreach (var hitObject in this.beatmap.HitObjects)
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hitObject.ApplyDefaults(this.beatmap.ControlPointInfo, this.beatmap.Difficulty);
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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 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 bool ShouldSkipLine(string line) => base.ShouldSkipLine(line) || line.StartsWith(' ') || line.StartsWith('_');
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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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metadata.PreviewTime = getOffsetTime(Parsing.ParseInt(pair.Value));
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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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if (!Enum.TryParse(split[0], out LegacyEventType type))
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throw new InvalidDataException($@"Unknown event type: {split[0]}");
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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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beatmap.BeatmapInfo.Metadata.BackgroundFile = CleanFilename(split[3]);
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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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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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break;
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}
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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;
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if (split.Length >= 7)
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timingChange = split[6][0] == '1';
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bool kiaiMode = false;
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bool omitFirstBarSignature = false;
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if (split.Length >= 8)
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{
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LegacyEffectFlags effectFlags = (LegacyEffectFlags)Parsing.ParseInt(split[7]);
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kiaiMode = effectFlags.HasFlagFast(LegacyEffectFlags.Kiai);
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omitFirstBarSignature = effectFlags.HasFlagFast(LegacyEffectFlags.OmitFirstBarLine);
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}
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string stringSampleSet = sampleSet.ToString().ToLowerInvariant();
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if (stringSampleSet == @"none")
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stringSampleSet = @"normal";
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if (timingChange)
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{
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if (double.IsNaN(beatLength))
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throw new InvalidDataException("Beat length cannot be NaN in a timing control point");
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var controlPoint = CreateTimingControlPoint();
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controlPoint.BeatLength = beatLength;
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controlPoint.TimeSignature = timeSignature;
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addControlPoint(time, controlPoint, true);
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}
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int onlineRulesetID = beatmap.BeatmapInfo.Ruleset.OnlineID;
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#pragma warning disable 618
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addControlPoint(time, new LegacyDifficultyControlPoint(onlineRulesetID, beatLength)
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#pragma warning restore 618
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{
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SliderVelocity = speedMultiplier,
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}, timingChange);
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var effectPoint = new EffectControlPoint
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{
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KiaiMode = kiaiMode,
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OmitFirstBarLine = omitFirstBarSignature,
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};
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// osu!taiko and osu!mania use effect points rather than difficulty points for scroll speed adjustments.
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if (onlineRulesetID == 1 || onlineRulesetID == 3)
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effectPoint.ScrollSpeed = speedMultiplier;
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addControlPoint(time, effectPoint, timingChange);
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addControlPoint(time, new LegacySampleControlPoint
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{
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SampleBank = stringSampleSet,
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SampleVolume = sampleVolume,
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CustomSampleBank = customSampleBank,
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}, timingChange);
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}
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private readonly List<ControlPoint> pendingControlPoints = new List<ControlPoint>();
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private readonly HashSet<Type> pendingControlPointTypes = new HashSet<Type>();
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private double pendingControlPointsTime;
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private bool hasApproachRate;
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private void addControlPoint(double time, ControlPoint point, bool timingChange)
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{
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if (time != pendingControlPointsTime)
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flushPendingPoints();
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if (timingChange)
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pendingControlPoints.Insert(0, point);
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else
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pendingControlPoints.Add(point);
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pendingControlPointsTime = time;
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}
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private void flushPendingPoints()
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{
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// 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).
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for (int i = pendingControlPoints.Count - 1; i >= 0; i--)
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{
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var type = pendingControlPoints[i].GetType();
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if (pendingControlPointTypes.Contains(type))
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continue;
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pendingControlPointTypes.Add(type);
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beatmap.ControlPointInfo.Add(pendingControlPointsTime, pendingControlPoints[i]);
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}
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pendingControlPoints.Clear();
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pendingControlPointTypes.Clear();
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}
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private void handleHitObject(string line)
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{
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// If the ruleset wasn't specified, assume the osu!standard ruleset.
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parser ??= new Rulesets.Objects.Legacy.Osu.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
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var obj = parser.Parse(line);
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if (obj != null)
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{
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obj.ApplyDefaults(beatmap.ControlPointInfo, beatmap.Difficulty);
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beatmap.HitObjects.Add(obj);
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}
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}
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private int getOffsetTime(int time) => time + (ApplyOffsets ? offset : 0);
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private double getOffsetTime() => ApplyOffsets ? offset : 0;
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private double getOffsetTime(double time) => time + (ApplyOffsets ? offset : 0);
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protected virtual TimingControlPoint CreateTimingControlPoint() => new TimingControlPoint();
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}
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}
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