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

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// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
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using System;
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using System.Collections.Generic;
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using System.Globalization;
using System.IO;
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using OpenTK.Graphics;
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using osu.Game.Beatmaps.Timing;
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using osu.Game.Beatmaps.Legacy;
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using osu.Game.Rulesets.Objects.Legacy;
using osu.Game.Beatmaps.ControlPoints;
namespace osu.Game.Beatmaps.Formats
{
public class OsuLegacyDecoder : BeatmapDecoder
{
public static void Register()
{
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AddDecoder<OsuLegacyDecoder>(@"osu file format v14");
AddDecoder<OsuLegacyDecoder>(@"osu file format v13");
AddDecoder<OsuLegacyDecoder>(@"osu file format v12");
AddDecoder<OsuLegacyDecoder>(@"osu file format v11");
AddDecoder<OsuLegacyDecoder>(@"osu file format v10");
AddDecoder<OsuLegacyDecoder>(@"osu file format v9");
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AddDecoder<OsuLegacyDecoder>(@"osu file format v8");
AddDecoder<OsuLegacyDecoder>(@"osu file format v7");
AddDecoder<OsuLegacyDecoder>(@"osu file format v6");
AddDecoder<OsuLegacyDecoder>(@"osu file format v5");
// TODO: Not sure how far back to go, or differences between versions
}
private ConvertHitObjectParser parser;
private readonly Dictionary<string, string> variables = new Dictionary<string, string>();
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private LegacySampleBank defaultSampleBank;
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private int defaultSampleVolume = 100;
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private readonly int beatmapVersion;
public OsuLegacyDecoder()
{
}
public OsuLegacyDecoder(string header)
{
beatmapVersion = int.Parse(header.Substring(17));
}
private enum Section
{
None,
General,
Editor,
Metadata,
Difficulty,
Events,
TimingPoints,
Colours,
HitObjects,
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Variables,
}
private void handleGeneral(Beatmap beatmap, string line)
{
var pair = splitKeyVal(line, ':');
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var metadata = beatmap.BeatmapInfo.Metadata;
switch (pair.Key)
{
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case @"AudioFilename":
metadata.AudioFile = pair.Value;
break;
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case @"AudioLeadIn":
beatmap.BeatmapInfo.AudioLeadIn = int.Parse(pair.Value);
break;
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case @"PreviewTime":
metadata.PreviewTime = int.Parse(pair.Value);
break;
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case @"Countdown":
beatmap.BeatmapInfo.Countdown = int.Parse(pair.Value) == 1;
break;
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case @"SampleSet":
defaultSampleBank = (LegacySampleBank)Enum.Parse(typeof(LegacySampleBank), pair.Value);
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break;
case @"SampleVolume":
defaultSampleVolume = int.Parse(pair.Value);
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break;
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case @"StackLeniency":
beatmap.BeatmapInfo.StackLeniency = float.Parse(pair.Value, NumberFormatInfo.InvariantInfo);
break;
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case @"Mode":
beatmap.BeatmapInfo.RulesetID = int.Parse(pair.Value);
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switch (beatmap.BeatmapInfo.RulesetID)
{
case 0:
parser = new Rulesets.Objects.Legacy.Osu.ConvertHitObjectParser();
break;
case 1:
parser = new Rulesets.Objects.Legacy.Taiko.ConvertHitObjectParser();
break;
case 2:
parser = new Rulesets.Objects.Legacy.Catch.ConvertHitObjectParser();
break;
case 3:
parser = new Rulesets.Objects.Legacy.Mania.ConvertHitObjectParser();
break;
}
break;
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case @"LetterboxInBreaks":
beatmap.BeatmapInfo.LetterboxInBreaks = int.Parse(pair.Value) == 1;
break;
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case @"SpecialStyle":
beatmap.BeatmapInfo.SpecialStyle = int.Parse(pair.Value) == 1;
break;
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case @"WidescreenStoryboard":
beatmap.BeatmapInfo.WidescreenStoryboard = int.Parse(pair.Value) == 1;
break;
}
}
private void handleEditor(Beatmap beatmap, string line)
{
var pair = splitKeyVal(line, ':');
switch (pair.Key)
{
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case @"Bookmarks":
beatmap.BeatmapInfo.StoredBookmarks = pair.Value;
break;
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case @"DistanceSpacing":
beatmap.BeatmapInfo.DistanceSpacing = double.Parse(pair.Value, NumberFormatInfo.InvariantInfo);
break;
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case @"BeatDivisor":
beatmap.BeatmapInfo.BeatDivisor = int.Parse(pair.Value);
break;
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case @"GridSize":
beatmap.BeatmapInfo.GridSize = int.Parse(pair.Value);
break;
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case @"TimelineZoom":
beatmap.BeatmapInfo.TimelineZoom = double.Parse(pair.Value, NumberFormatInfo.InvariantInfo);
break;
}
}
private void handleMetadata(Beatmap beatmap, string line)
{
var pair = splitKeyVal(line, ':');
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var metadata = beatmap.BeatmapInfo.Metadata;
switch (pair.Key)
{
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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.Author = 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 = int.Parse(pair.Value);
break;
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case @"BeatmapSetID":
beatmap.BeatmapInfo.OnlineBeatmapSetID = int.Parse(pair.Value);
metadata.OnlineBeatmapSetID = int.Parse(pair.Value);
break;
}
}
private void handleDifficulty(Beatmap beatmap, string line)
{
var pair = splitKeyVal(line, ':');
var difficulty = beatmap.BeatmapInfo.Difficulty;
switch (pair.Key)
{
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case @"HPDrainRate":
difficulty.DrainRate = float.Parse(pair.Value, NumberFormatInfo.InvariantInfo);
break;
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case @"CircleSize":
difficulty.CircleSize = float.Parse(pair.Value, NumberFormatInfo.InvariantInfo);
break;
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case @"OverallDifficulty":
difficulty.OverallDifficulty = float.Parse(pair.Value, NumberFormatInfo.InvariantInfo);
break;
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case @"ApproachRate":
difficulty.ApproachRate = float.Parse(pair.Value, NumberFormatInfo.InvariantInfo);
break;
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case @"SliderMultiplier":
difficulty.SliderMultiplier = float.Parse(pair.Value, NumberFormatInfo.InvariantInfo);
break;
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case @"SliderTickRate":
difficulty.SliderTickRate = float.Parse(pair.Value, NumberFormatInfo.InvariantInfo);
break;
}
}
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/// <summary>
/// Decodes any beatmap variables present in a line into their real values.
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/// </summary>
/// <param name="line">The line which may contains variables.</param>
private void decodeVariables(ref string line)
{
while (line.IndexOf('$') >= 0)
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{
string[] split = line.Split(',');
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for (int i = 0; i < split.Length; i++)
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{
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var item = split[i];
if (item.StartsWith("$") && variables.ContainsKey(item))
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split[i] = variables[item];
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}
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line = string.Join(",", split);
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}
}
private void handleEvents(Beatmap beatmap, string line)
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{
decodeVariables(ref line);
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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))
throw new InvalidDataException($@"Unknown event type {split[0]}");
// Todo: Implement the rest
switch (type)
{
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case EventType.Video:
case EventType.Background:
string filename = split[2].Trim('"');
if (type == EventType.Background)
beatmap.BeatmapInfo.Metadata.BackgroundFile = filename;
break;
case EventType.Break:
var breakEvent = new BreakPeriod
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{
StartTime = double.Parse(split[1], NumberFormatInfo.InvariantInfo),
EndTime = double.Parse(split[2], NumberFormatInfo.InvariantInfo)
};
if (!breakEvent.HasEffect)
return;
beatmap.Breaks.Add(breakEvent);
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break;
}
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}
private void handleTimingPoints(Beatmap beatmap, string line)
{
string[] split = line.Split(',');
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double time = double.Parse(split[0].Trim(), NumberFormatInfo.InvariantInfo);
double beatLength = double.Parse(split[1].Trim(), NumberFormatInfo.InvariantInfo);
double speedMultiplier = beatLength < 0 ? -beatLength / 100.0 : 1;
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TimeSignatures timeSignature = TimeSignatures.SimpleQuadruple;
if (split.Length >= 3)
timeSignature = split[2][0] == '0' ? TimeSignatures.SimpleQuadruple : (TimeSignatures)int.Parse(split[2]);
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LegacySampleBank sampleSet = defaultSampleBank;
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if (split.Length >= 4)
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sampleSet = (LegacySampleBank)int.Parse(split[3]);
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//SampleBank sampleBank = SampleBank.Default;
//if (split.Length >= 5)
// sampleBank = (SampleBank)int.Parse(split[4]);
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int sampleVolume = defaultSampleVolume;
if (split.Length >= 6)
sampleVolume = int.Parse(split[5]);
bool timingChange = true;
if (split.Length >= 7)
timingChange = split[6][0] == '1';
bool kiaiMode = false;
bool omitFirstBarSignature = false;
if (split.Length >= 8)
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{
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int effectFlags = int.Parse(split[7]);
kiaiMode = (effectFlags & 1) > 0;
omitFirstBarSignature = (effectFlags & 8) > 0;
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}
string stringSampleSet = sampleSet.ToString().ToLower();
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if (stringSampleSet == @"none")
stringSampleSet = @"normal";
DifficultyControlPoint difficultyPoint = beatmap.ControlPointInfo.DifficultyPointAt(time);
SoundControlPoint soundPoint = beatmap.ControlPointInfo.SoundPointAt(time);
EffectControlPoint effectPoint = beatmap.ControlPointInfo.EffectPointAt(time);
if (timingChange)
{
beatmap.ControlPointInfo.TimingPoints.Add(new TimingControlPoint
{
Time = time,
BeatLength = beatLength,
TimeSignature = timeSignature
});
}
if (speedMultiplier != difficultyPoint.SpeedMultiplier)
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{
beatmap.ControlPointInfo.DifficultyPoints.Add(new DifficultyControlPoint
{
Time = time,
SpeedMultiplier = speedMultiplier
});
}
if (stringSampleSet != soundPoint.SampleBank || sampleVolume != soundPoint.SampleVolume)
{
beatmap.ControlPointInfo.SoundPoints.Add(new SoundControlPoint
{
Time = time,
SampleBank = stringSampleSet,
SampleVolume = sampleVolume
});
}
if (kiaiMode != effectPoint.KiaiMode || omitFirstBarSignature != effectPoint.OmitFirstBarLine)
{
beatmap.ControlPointInfo.EffectPoints.Add(new EffectControlPoint
{
Time = time,
KiaiMode = kiaiMode,
OmitFirstBarLine = omitFirstBarSignature
});
}
}
private void handleColours(Beatmap beatmap, string line, ref bool hasCustomColours)
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{
var pair = splitKeyVal(line, ':');
string[] split = pair.Value.Split(',');
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if (split.Length != 3)
throw new InvalidOperationException($@"Color specified in incorrect format (should be R,G,B): {pair.Value}");
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byte r, g, b;
if (!byte.TryParse(split[0], out r) || !byte.TryParse(split[1], out g) || !byte.TryParse(split[2], out b))
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throw new InvalidOperationException(@"Color must be specified with 8-bit integer components");
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if (!hasCustomColours)
{
beatmap.ComboColors.Clear();
hasCustomColours = true;
}
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// Note: the combo index specified in the beatmap is discarded
if (pair.Key.StartsWith(@"Combo"))
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{
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beatmap.ComboColors.Add(new Color4
{
R = r / 255f,
G = g / 255f,
B = b / 255f,
A = 1f,
});
}
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}
private void handleVariables(string line)
{
var pair = splitKeyVal(line, '=');
variables[pair.Key] = pair.Value;
}
protected override Beatmap ParseFile(StreamReader stream)
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{
return new LegacyBeatmap(base.ParseFile(stream));
}
public override Beatmap Decode(StreamReader stream)
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{
return new LegacyBeatmap(base.Decode(stream));
}
protected override void ParseFile(StreamReader stream, Beatmap beatmap)
{
beatmap.BeatmapInfo.BeatmapVersion = beatmapVersion;
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Section section = Section.None;
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bool hasCustomColours = false;
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string line;
while ((line = stream.ReadLine()) != null)
{
if (string.IsNullOrEmpty(line))
continue;
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if (line.StartsWith(" ") || line.StartsWith("_") || line.StartsWith("//"))
continue;
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if (line.StartsWith(@"osu file format v"))
{
beatmap.BeatmapInfo.BeatmapVersion = int.Parse(line.Substring(17));
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continue;
}
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if (line.StartsWith(@"[") && line.EndsWith(@"]"))
{
if (!Enum.TryParse(line.Substring(1, line.Length - 2), out section))
throw new InvalidDataException($@"Unknown osu section {line}");
continue;
}
switch (section)
{
case Section.General:
handleGeneral(beatmap, line);
break;
case Section.Editor:
handleEditor(beatmap, line);
break;
case Section.Metadata:
handleMetadata(beatmap, line);
break;
case Section.Difficulty:
handleDifficulty(beatmap, line);
break;
case Section.Events:
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handleEvents(beatmap, line);
break;
case Section.TimingPoints:
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handleTimingPoints(beatmap, line);
break;
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case Section.Colours:
handleColours(beatmap, line, ref hasCustomColours);
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break;
case Section.HitObjects:
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var obj = parser.Parse(line);
if (obj != null)
beatmap.HitObjects.Add(obj);
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break;
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case Section.Variables:
handleVariables(line);
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break;
}
}
foreach (var hitObject in beatmap.HitObjects)
hitObject.ApplyDefaults(beatmap.ControlPointInfo, beatmap.BeatmapInfo.Difficulty);
}
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private KeyValuePair<string, string> splitKeyVal(string line, char separator)
{
return new KeyValuePair<string, string>
(
line.Remove(line.IndexOf(separator)).Trim(),
line.Substring(line.IndexOf(separator) + 1).Trim()
);
}
internal enum LegacySampleBank
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{
None = 0,
Normal = 1,
Soft = 2,
Drum = 3
}
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internal enum EventType
{
Background = 0,
Video = 1,
Break = 2,
Colour = 3,
Sprite = 4,
Sample = 5,
Animation = 6
}
}
}