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86588778b1
After the preparatory introduction of LineBufferedReader, it is now possible to introduce registration of fallback decoders that won't drop input supplied in the first line of the file. A fallback decoder is used when the magic in the first line of the file does not match any of the other known decoders. In such a case, the fallback decoder is constructed and provided a LineBufferedReader instance. The process of matching magic only peeks the first non-empty line, so it is available for re-reading in Decode() using ReadLine(). There can be only one fallback decoder per type; a second attempt of registering a fallback will result in an exception to avoid bugs. To address the issue of parsing failing on badly or non-headered files, set the legacy decoders for Beatmaps and Storyboards as the fallbacks. Due to non-trivial logic, several new, passing unit tests with possible edge cases also included.
500 lines
18 KiB
C#
500 lines
18 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.IO;
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using System.Linq;
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using osu.Framework.IO.File;
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using osu.Game.Beatmaps.Timing;
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using osu.Game.Rulesets.Objects.Legacy;
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using osu.Game.Beatmaps.ControlPoints;
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using osu.Game.IO;
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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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public const int LATEST_VERSION = 14;
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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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// BeatmapVersion 4 and lower had an incorrect offset (stable has this set as 24ms off)
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offset = FormatVersion < 5 ? 24 : 0;
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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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base.ParseStreamInto(stream, beatmap);
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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.BeatmapInfo.BaseDifficulty);
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}
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protected override bool ShouldSkipLine(string line) => base.ShouldSkipLine(line) || line.StartsWith(" ", StringComparison.Ordinal) || line.StartsWith("_", StringComparison.Ordinal);
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protected override void ParseLine(Beatmap beatmap, Section section, string line)
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{
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var strippedLine = StripComments(line);
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switch (section)
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{
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case Section.General:
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handleGeneral(strippedLine);
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return;
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case Section.Editor:
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handleEditor(strippedLine);
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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(strippedLine);
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return;
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case Section.Events:
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handleEvent(strippedLine);
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return;
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case Section.TimingPoints:
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handleTimingPoint(strippedLine);
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return;
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case Section.HitObjects:
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handleHitObject(strippedLine);
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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 = FileSafety.PathStandardise(pair.Value);
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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 @"Countdown":
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beatmap.BeatmapInfo.Countdown = Parsing.ParseInt(pair.Value) == 1;
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break;
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case @"SampleSet":
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defaultSampleBank = (LegacySampleBank)Enum.Parse(typeof(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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beatmap.BeatmapInfo.RulesetID = Parsing.ParseInt(pair.Value);
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switch (beatmap.BeatmapInfo.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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}
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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.StoredBookmarks = pair.Value;
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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.AuthorString = pair.Value;
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break;
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case @"Version":
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beatmap.BeatmapInfo.Version = pair.Value;
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break;
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case @"Source":
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beatmap.BeatmapInfo.Metadata.Source = pair.Value;
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break;
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case @"Tags":
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beatmap.BeatmapInfo.Metadata.Tags = pair.Value;
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break;
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case @"BeatmapID":
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beatmap.BeatmapInfo.OnlineBeatmapID = Parsing.ParseInt(pair.Value);
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break;
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case @"BeatmapSetID":
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beatmap.BeatmapInfo.BeatmapSet = new BeatmapSetInfo { OnlineBeatmapSetID = 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.BeatmapInfo.BaseDifficulty;
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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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break;
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case @"ApproachRate":
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difficulty.ApproachRate = Parsing.ParseFloat(pair.Value);
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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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EventType type;
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if (!Enum.TryParse(split[0], out 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 EventType.Background:
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string bgFilename = split[2].Trim('"');
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beatmap.BeatmapInfo.Metadata.BackgroundFile = FileSafety.PathStandardise(bgFilename);
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break;
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case EventType.Video:
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string videoFilename = split[2].Trim('"');
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beatmap.BeatmapInfo.Metadata.VideoFile = FileSafety.PathStandardise(videoFilename);
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break;
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case EventType.Break:
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double start = getOffsetTime(Parsing.ParseDouble(split[1]));
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var breakEvent = new BreakPeriod
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{
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StartTime = start,
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EndTime = Math.Max(start, getOffsetTime(Parsing.ParseDouble(split[2])))
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};
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if (!breakEvent.HasEffect)
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return;
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beatmap.Breaks.Add(breakEvent);
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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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double beatLength = Parsing.ParseDouble(split[1].Trim());
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double speedMultiplier = beatLength < 0 ? 100.0 / -beatLength : 1;
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TimeSignatures timeSignature = TimeSignatures.SimpleQuadruple;
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if (split.Length >= 3)
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timeSignature = split[2][0] == '0' ? TimeSignatures.SimpleQuadruple : (TimeSignatures)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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EffectFlags effectFlags = (EffectFlags)Parsing.ParseInt(split[7]);
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kiaiMode = effectFlags.HasFlag(EffectFlags.Kiai);
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omitFirstBarSignature = effectFlags.HasFlag(EffectFlags.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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var controlPoint = CreateTimingControlPoint();
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controlPoint.Time = time;
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controlPoint.BeatLength = beatLength;
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controlPoint.TimeSignature = timeSignature;
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handleTimingControlPoint(controlPoint);
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}
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handleDifficultyControlPoint(new DifficultyControlPoint
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{
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Time = time,
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SpeedMultiplier = speedMultiplier,
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AutoGenerated = timingChange
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});
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handleEffectControlPoint(new EffectControlPoint
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{
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Time = time,
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KiaiMode = kiaiMode,
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OmitFirstBarLine = omitFirstBarSignature,
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AutoGenerated = timingChange
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});
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handleSampleControlPoint(new LegacySampleControlPoint
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{
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Time = time,
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SampleBank = stringSampleSet,
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SampleVolume = sampleVolume,
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CustomSampleBank = customSampleBank,
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AutoGenerated = timingChange
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});
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}
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private void handleTimingControlPoint(TimingControlPoint newPoint)
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{
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var existing = beatmap.ControlPointInfo.TimingPointAt(newPoint.Time);
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if (existing.Time == newPoint.Time)
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{
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// autogenerated points should not replace non-autogenerated.
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// this allows for incorrectly ordered timing points to still be correctly handled.
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if (newPoint.AutoGenerated && !existing.AutoGenerated)
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return;
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beatmap.ControlPointInfo.TimingPoints.Remove(existing);
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}
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beatmap.ControlPointInfo.TimingPoints.Add(newPoint);
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}
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private void handleDifficultyControlPoint(DifficultyControlPoint newPoint)
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{
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var existing = beatmap.ControlPointInfo.DifficultyPointAt(newPoint.Time);
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if (existing.Time == newPoint.Time)
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{
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// autogenerated points should not replace non-autogenerated.
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// this allows for incorrectly ordered timing points to still be correctly handled.
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if (newPoint.AutoGenerated && !existing.AutoGenerated)
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return;
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beatmap.ControlPointInfo.DifficultyPoints.Remove(existing);
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}
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beatmap.ControlPointInfo.DifficultyPoints.Add(newPoint);
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}
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private void handleEffectControlPoint(EffectControlPoint newPoint)
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{
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var existing = beatmap.ControlPointInfo.EffectPointAt(newPoint.Time);
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if (existing.Time == newPoint.Time)
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{
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// autogenerated points should not replace non-autogenerated.
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// this allows for incorrectly ordered timing points to still be correctly handled.
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if (newPoint.AutoGenerated && !existing.AutoGenerated)
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return;
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beatmap.ControlPointInfo.EffectPoints.Remove(existing);
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}
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beatmap.ControlPointInfo.EffectPoints.Add(newPoint);
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}
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private void handleSampleControlPoint(SampleControlPoint newPoint)
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{
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var existing = beatmap.ControlPointInfo.SamplePointAt(newPoint.Time);
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if (existing.Time == newPoint.Time)
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{
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// autogenerated points should not replace non-autogenerated.
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// this allows for incorrectly ordered timing points to still be correctly handled.
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if (newPoint.AutoGenerated && !existing.AutoGenerated)
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return;
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beatmap.ControlPointInfo.SamplePoints.Remove(existing);
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}
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beatmap.ControlPointInfo.SamplePoints.Add(newPoint);
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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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if (parser == null)
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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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beatmap.HitObjects.Add(obj);
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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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[Flags]
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internal enum EffectFlags
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{
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None = 0,
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Kiai = 1,
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OmitFirstBarLine = 8
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}
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}
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}
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