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osu-lazer/osu.Game/Beatmaps/Formats/LegacyBeatmapDecoder.cs

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// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
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using System;
using System.IO;
using System.Linq;
using osu.Framework.IO.File;
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using osu.Framework.Logging;
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using osu.Game.Beatmaps.Timing;
using osu.Game.Rulesets.Objects.Legacy;
using osu.Game.Beatmaps.ControlPoints;
namespace osu.Game.Beatmaps.Formats
{
public class LegacyBeatmapDecoder : LegacyDecoder<Beatmap>
{
public const int LATEST_VERSION = 14;
private Beatmap beatmap;
private ConvertHitObjectParser parser;
private LegacySampleBank defaultSampleBank;
private int defaultSampleVolume = 100;
public static void Register()
{
AddDecoder<Beatmap>(@"osu file format v", m => new LegacyBeatmapDecoder(Parsing.ParseInt(m.Split('v').Last())));
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}
/// <summary>
/// Whether or not beatmap or runtime offsets should be applied. Defaults on; only disable for testing purposes.
/// </summary>
public bool ApplyOffsets = true;
private readonly int offset;
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public LegacyBeatmapDecoder(int version = LATEST_VERSION)
: base(version)
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{
// BeatmapVersion 4 and lower had an incorrect offset (stable has this set as 24ms off)
offset = FormatVersion < 5 ? 24 : 0;
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}
protected override void ParseStreamInto(StreamReader stream, Beatmap beatmap)
{
this.beatmap = beatmap;
this.beatmap.BeatmapInfo.BeatmapVersion = FormatVersion;
base.ParseStreamInto(stream, beatmap);
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// Objects may be out of order *only* if a user has manually edited an .osu file.
// Unfortunately there are ranked maps in this state (example: https://osu.ppy.sh/s/594828).
// OrderBy is used to guarantee that the parsing order of hitobjects with equal start times is maintained (stably-sorted)
// 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)
hitObject.ApplyDefaults(this.beatmap.ControlPointInfo, this.beatmap.BeatmapInfo.BaseDifficulty);
}
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)
{
var strippedLine = StripComments(line);
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switch (section)
{
case Section.General:
handleGeneral(strippedLine);
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return;
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case Section.Editor:
handleEditor(strippedLine);
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return;
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case Section.Metadata:
handleMetadata(line);
return;
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case Section.Difficulty:
handleDifficulty(strippedLine);
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return;
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case Section.Events:
handleEvent(strippedLine);
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return;
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case Section.TimingPoints:
handleTimingPoint(strippedLine);
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return;
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case Section.HitObjects:
handleHitObject(strippedLine);
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return;
}
base.ParseLine(beatmap, section, line);
}
private void handleGeneral(string line)
{
var pair = SplitKeyVal(line);
var metadata = beatmap.BeatmapInfo.Metadata;
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switch (pair.Key)
{
case @"AudioFilename":
metadata.AudioFile = FileSafety.PathStandardise(pair.Value);
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break;
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case @"AudioLeadIn":
beatmap.BeatmapInfo.AudioLeadIn = Parsing.ParseInt(pair.Value);
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break;
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case @"PreviewTime":
metadata.PreviewTime = getOffsetTime(Parsing.ParseInt(pair.Value));
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break;
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case @"Countdown":
beatmap.BeatmapInfo.Countdown = Parsing.ParseInt(pair.Value) == 1;
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break;
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case @"SampleSet":
defaultSampleBank = (LegacySampleBank)Enum.Parse(typeof(LegacySampleBank), pair.Value);
break;
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case @"SampleVolume":
defaultSampleVolume = Parsing.ParseInt(pair.Value);
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break;
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case @"StackLeniency":
beatmap.BeatmapInfo.StackLeniency = Parsing.ParseFloat(pair.Value);
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break;
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case @"Mode":
beatmap.BeatmapInfo.RulesetID = Parsing.ParseInt(pair.Value);
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switch (beatmap.BeatmapInfo.RulesetID)
{
case 0:
parser = new Rulesets.Objects.Legacy.Osu.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
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break;
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case 1:
parser = new Rulesets.Objects.Legacy.Taiko.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
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break;
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case 2:
parser = new Rulesets.Objects.Legacy.Catch.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
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break;
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case 3:
parser = new Rulesets.Objects.Legacy.Mania.ConvertHitObjectParser(getOffsetTime(), FormatVersion);
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break;
}
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break;
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case @"LetterboxInBreaks":
beatmap.BeatmapInfo.LetterboxInBreaks = Parsing.ParseInt(pair.Value) == 1;
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break;
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case @"SpecialStyle":
beatmap.BeatmapInfo.SpecialStyle = Parsing.ParseInt(pair.Value) == 1;
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break;
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case @"WidescreenStoryboard":
beatmap.BeatmapInfo.WidescreenStoryboard = Parsing.ParseInt(pair.Value) == 1;
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break;
}
}
private void handleEditor(string line)
{
var pair = SplitKeyVal(line);
switch (pair.Key)
{
case @"Bookmarks":
beatmap.BeatmapInfo.StoredBookmarks = pair.Value;
break;
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case @"DistanceSpacing":
beatmap.BeatmapInfo.DistanceSpacing = Math.Max(0, Parsing.ParseDouble(pair.Value));
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break;
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case @"BeatDivisor":
beatmap.BeatmapInfo.BeatDivisor = Parsing.ParseInt(pair.Value);
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break;
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case @"GridSize":
beatmap.BeatmapInfo.GridSize = Parsing.ParseInt(pair.Value);
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break;
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case @"TimelineZoom":
beatmap.BeatmapInfo.TimelineZoom = Math.Max(0, Parsing.ParseDouble(pair.Value));
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break;
}
}
private void handleMetadata(string line)
{
var pair = SplitKeyVal(line);
var metadata = beatmap.BeatmapInfo.Metadata;
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switch (pair.Key)
{
case @"Title":
metadata.Title = pair.Value;
break;
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case @"TitleUnicode":
metadata.TitleUnicode = pair.Value;
break;
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case @"Artist":
metadata.Artist = pair.Value;
break;
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case @"ArtistUnicode":
metadata.ArtistUnicode = pair.Value;
break;
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case @"Creator":
metadata.AuthorString = pair.Value;
break;
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case @"Version":
beatmap.BeatmapInfo.Version = pair.Value;
break;
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case @"Source":
beatmap.BeatmapInfo.Metadata.Source = pair.Value;
break;
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case @"Tags":
beatmap.BeatmapInfo.Metadata.Tags = pair.Value;
break;
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case @"BeatmapID":
beatmap.BeatmapInfo.OnlineBeatmapID = Parsing.ParseInt(pair.Value);
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break;
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case @"BeatmapSetID":
beatmap.BeatmapInfo.BeatmapSet = new BeatmapSetInfo { OnlineBeatmapSetID = Parsing.ParseInt(pair.Value) };
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break;
}
}
private void handleDifficulty(string line)
{
var pair = SplitKeyVal(line);
var difficulty = beatmap.BeatmapInfo.BaseDifficulty;
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switch (pair.Key)
{
case @"HPDrainRate":
difficulty.DrainRate = Parsing.ParseFloat(pair.Value);
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break;
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case @"CircleSize":
difficulty.CircleSize = Parsing.ParseFloat(pair.Value);
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break;
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case @"OverallDifficulty":
difficulty.OverallDifficulty = Parsing.ParseFloat(pair.Value);
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break;
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case @"ApproachRate":
difficulty.ApproachRate = Parsing.ParseFloat(pair.Value);
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break;
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case @"SliderMultiplier":
difficulty.SliderMultiplier = Parsing.ParseDouble(pair.Value);
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break;
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case @"SliderTickRate":
difficulty.SliderTickRate = Parsing.ParseDouble(pair.Value);
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break;
}
}
private void handleEvent(string line)
{
string[] split = line.Split(',');
EventType type;
if (!Enum.TryParse(split[0], out type))
throw new InvalidDataException($@"Unknown event type {split[0]}");
switch (type)
{
case EventType.Background:
string filename = split[2].Trim('"');
beatmap.BeatmapInfo.Metadata.BackgroundFile = FileSafety.PathStandardise(filename);
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break;
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case EventType.Break:
double start = getOffsetTime(Parsing.ParseDouble(split[1]));
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var breakEvent = new BreakPeriod
{
StartTime = start,
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EndTime = Math.Max(start, getOffsetTime(Parsing.ParseDouble(split[2])))
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};
if (!breakEvent.HasEffect)
return;
beatmap.Breaks.Add(breakEvent);
break;
}
}
private void handleTimingPoint(string line)
{
try
{
string[] split = line.Split(',');
double time = getOffsetTime(Parsing.ParseDouble(split[0].Trim()));
double beatLength = Parsing.ParseDouble(split[1].Trim());
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double speedMultiplier = beatLength < 0 ? 100.0 / -beatLength : 1;
TimeSignatures timeSignature = TimeSignatures.SimpleQuadruple;
if (split.Length >= 3)
timeSignature = split[2][0] == '0' ? TimeSignatures.SimpleQuadruple : (TimeSignatures)Parsing.ParseInt(split[2]);
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LegacySampleBank sampleSet = defaultSampleBank;
if (split.Length >= 4)
sampleSet = (LegacySampleBank)Parsing.ParseInt(split[3]);
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int customSampleBank = 0;
if (split.Length >= 5)
customSampleBank = Parsing.ParseInt(split[4]);
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int sampleVolume = defaultSampleVolume;
if (split.Length >= 6)
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;
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if (split.Length >= 8)
{
EffectFlags effectFlags = (EffectFlags)Parsing.ParseInt(split[7]);
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kiaiMode = effectFlags.HasFlag(EffectFlags.Kiai);
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")
stringSampleSet = @"normal";
if (timingChange)
{
var controlPoint = CreateTimingControlPoint();
controlPoint.Time = time;
controlPoint.BeatLength = beatLength;
controlPoint.TimeSignature = timeSignature;
handleTimingControlPoint(controlPoint);
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}
handleDifficultyControlPoint(new DifficultyControlPoint
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{
Time = time,
SpeedMultiplier = speedMultiplier,
AutoGenerated = timingChange
});
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handleEffectControlPoint(new EffectControlPoint
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{
Time = time,
KiaiMode = kiaiMode,
OmitFirstBarLine = omitFirstBarSignature,
AutoGenerated = timingChange
});
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handleSampleControlPoint(new LegacySampleControlPoint
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{
Time = time,
SampleBank = stringSampleSet,
SampleVolume = sampleVolume,
CustomSampleBank = customSampleBank,
AutoGenerated = timingChange
});
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}
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catch (FormatException)
{
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Logger.Log("A timing point could not be parsed correctly and will be ignored", LoggingTarget.Runtime, LogLevel.Important);
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}
catch (OverflowException)
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{
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Logger.Log("A timing point could not be parsed correctly and will be ignored", LoggingTarget.Runtime, LogLevel.Important);
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}
}
private void handleTimingControlPoint(TimingControlPoint newPoint)
{
var existing = beatmap.ControlPointInfo.TimingPointAt(newPoint.Time);
if (existing.Time == newPoint.Time)
{
// autogenerated points should not replace non-autogenerated.
// this allows for incorrectly ordered timing points to still be correctly handled.
if (newPoint.AutoGenerated && !existing.AutoGenerated)
return;
beatmap.ControlPointInfo.TimingPoints.Remove(existing);
}
beatmap.ControlPointInfo.TimingPoints.Add(newPoint);
}
private void handleDifficultyControlPoint(DifficultyControlPoint newPoint)
{
var existing = beatmap.ControlPointInfo.DifficultyPointAt(newPoint.Time);
if (existing.Time == newPoint.Time)
{
// autogenerated points should not replace non-autogenerated.
// this allows for incorrectly ordered timing points to still be correctly handled.
if (newPoint.AutoGenerated && !existing.AutoGenerated)
return;
beatmap.ControlPointInfo.DifficultyPoints.Remove(existing);
}
beatmap.ControlPointInfo.DifficultyPoints.Add(newPoint);
}
private void handleEffectControlPoint(EffectControlPoint newPoint)
{
var existing = beatmap.ControlPointInfo.EffectPointAt(newPoint.Time);
if (existing.Time == newPoint.Time)
{
// autogenerated points should not replace non-autogenerated.
// this allows for incorrectly ordered timing points to still be correctly handled.
if (newPoint.AutoGenerated && !existing.AutoGenerated)
return;
beatmap.ControlPointInfo.EffectPoints.Remove(existing);
}
beatmap.ControlPointInfo.EffectPoints.Add(newPoint);
}
private void handleSampleControlPoint(SampleControlPoint newPoint)
{
var existing = beatmap.ControlPointInfo.SamplePointAt(newPoint.Time);
if (existing.Time == newPoint.Time)
{
// autogenerated points should not replace non-autogenerated.
// this allows for incorrectly ordered timing points to still be correctly handled.
if (newPoint.AutoGenerated && !existing.AutoGenerated)
return;
beatmap.ControlPointInfo.SamplePoints.Remove(existing);
}
beatmap.ControlPointInfo.SamplePoints.Add(newPoint);
}
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private void handleHitObject(string line)
{
// If the ruleset wasn't specified, assume the osu!standard ruleset.
if (parser == null)
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)
beatmap.HitObjects.Add(obj);
}
private int getOffsetTime(int time) => time + (ApplyOffsets ? offset : 0);
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]
internal enum EffectFlags
{
None = 0,
Kiai = 1,
OmitFirstBarLine = 8
}
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}
}