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osu/osu.Game/Beatmaps/Formats/LegacyBeatmapEncoder.cs
smoogipoo 9b0ce2999f Fix legacy encoder
2021-04-09 15:28:42 +09:00

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22 KiB
C#
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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.
using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using JetBrains.Annotations;
using osu.Game.Audio;
using osu.Game.Beatmaps.ControlPoints;
using osu.Game.Beatmaps.Legacy;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Legacy;
using osu.Game.Rulesets.Objects.Types;
using osu.Game.Skinning;
using osuTK;
using osuTK.Graphics;
namespace osu.Game.Beatmaps.Formats
{
public class LegacyBeatmapEncoder
{
public const int LATEST_VERSION = 128;
private readonly IBeatmap beatmap;
[CanBeNull]
private readonly ISkin skin;
/// <summary>
/// Creates a new <see cref="LegacyBeatmapEncoder"/>.
/// </summary>
/// <param name="beatmap">The beatmap to encode.</param>
/// <param name="skin">The beatmap's skin, used for encoding combo colours.</param>
public LegacyBeatmapEncoder(IBeatmap beatmap, [CanBeNull] ISkin skin)
{
this.beatmap = beatmap;
this.skin = skin;
if (beatmap.BeatmapInfo.RulesetID < 0 || beatmap.BeatmapInfo.RulesetID > 3)
throw new ArgumentException("Only beatmaps in the osu, taiko, catch, or mania rulesets can be encoded to the legacy beatmap format.", nameof(beatmap));
}
public void Encode(TextWriter writer)
{
writer.WriteLine($"osu file format v{LATEST_VERSION}");
writer.WriteLine();
handleGeneral(writer);
writer.WriteLine();
handleEditor(writer);
writer.WriteLine();
handleMetadata(writer);
writer.WriteLine();
handleDifficulty(writer);
writer.WriteLine();
handleEvents(writer);
writer.WriteLine();
handleControlPoints(writer);
writer.WriteLine();
handleColours(writer);
writer.WriteLine();
handleHitObjects(writer);
}
private void handleGeneral(TextWriter writer)
{
writer.WriteLine("[General]");
if (beatmap.Metadata.AudioFile != null) writer.WriteLine(FormattableString.Invariant($"AudioFilename: {Path.GetFileName(beatmap.Metadata.AudioFile)}"));
writer.WriteLine(FormattableString.Invariant($"AudioLeadIn: {beatmap.BeatmapInfo.AudioLeadIn}"));
writer.WriteLine(FormattableString.Invariant($"PreviewTime: {beatmap.Metadata.PreviewTime}"));
// Todo: Not all countdown types are supported by lazer yet
writer.WriteLine(FormattableString.Invariant($"Countdown: {(beatmap.BeatmapInfo.Countdown ? '1' : '0')}"));
writer.WriteLine(FormattableString.Invariant($"SampleSet: {toLegacySampleBank(beatmap.ControlPointInfo.SamplePointAt(double.MinValue).SampleBank)}"));
writer.WriteLine(FormattableString.Invariant($"StackLeniency: {beatmap.BeatmapInfo.StackLeniency}"));
writer.WriteLine(FormattableString.Invariant($"Mode: {beatmap.BeatmapInfo.RulesetID}"));
writer.WriteLine(FormattableString.Invariant($"LetterboxInBreaks: {(beatmap.BeatmapInfo.LetterboxInBreaks ? '1' : '0')}"));
// if (beatmap.BeatmapInfo.UseSkinSprites)
// writer.WriteLine(@"UseSkinSprites: 1");
// if (b.AlwaysShowPlayfield)
// writer.WriteLine(@"AlwaysShowPlayfield: 1");
// if (b.OverlayPosition != OverlayPosition.NoChange)
// writer.WriteLine(@"OverlayPosition: " + b.OverlayPosition);
// if (!string.IsNullOrEmpty(b.SkinPreference))
// writer.WriteLine(@"SkinPreference:" + b.SkinPreference);
// if (b.EpilepsyWarning)
// writer.WriteLine(@"EpilepsyWarning: 1");
// if (b.CountdownOffset > 0)
// writer.WriteLine(@"CountdownOffset: " + b.CountdownOffset.ToString());
if (beatmap.BeatmapInfo.RulesetID == 3)
writer.WriteLine(FormattableString.Invariant($"SpecialStyle: {(beatmap.BeatmapInfo.SpecialStyle ? '1' : '0')}"));
writer.WriteLine(FormattableString.Invariant($"WidescreenStoryboard: {(beatmap.BeatmapInfo.WidescreenStoryboard ? '1' : '0')}"));
// if (b.SamplesMatchPlaybackRate)
// writer.WriteLine(@"SamplesMatchPlaybackRate: 1");
}
private void handleEditor(TextWriter writer)
{
writer.WriteLine("[Editor]");
if (beatmap.BeatmapInfo.Bookmarks.Length > 0)
writer.WriteLine(FormattableString.Invariant($"Bookmarks: {string.Join(',', beatmap.BeatmapInfo.Bookmarks)}"));
writer.WriteLine(FormattableString.Invariant($"DistanceSpacing: {beatmap.BeatmapInfo.DistanceSpacing}"));
writer.WriteLine(FormattableString.Invariant($"BeatDivisor: {beatmap.BeatmapInfo.BeatDivisor}"));
writer.WriteLine(FormattableString.Invariant($"GridSize: {beatmap.BeatmapInfo.GridSize}"));
writer.WriteLine(FormattableString.Invariant($"TimelineZoom: {beatmap.BeatmapInfo.TimelineZoom}"));
}
private void handleMetadata(TextWriter writer)
{
writer.WriteLine("[Metadata]");
writer.WriteLine(FormattableString.Invariant($"Title: {beatmap.Metadata.Title}"));
if (beatmap.Metadata.TitleUnicode != null) writer.WriteLine(FormattableString.Invariant($"TitleUnicode: {beatmap.Metadata.TitleUnicode}"));
writer.WriteLine(FormattableString.Invariant($"Artist: {beatmap.Metadata.Artist}"));
if (beatmap.Metadata.ArtistUnicode != null) writer.WriteLine(FormattableString.Invariant($"ArtistUnicode: {beatmap.Metadata.ArtistUnicode}"));
writer.WriteLine(FormattableString.Invariant($"Creator: {beatmap.Metadata.AuthorString}"));
writer.WriteLine(FormattableString.Invariant($"Version: {beatmap.BeatmapInfo.Version}"));
if (beatmap.Metadata.Source != null) writer.WriteLine(FormattableString.Invariant($"Source: {beatmap.Metadata.Source}"));
if (beatmap.Metadata.Tags != null) writer.WriteLine(FormattableString.Invariant($"Tags: {beatmap.Metadata.Tags}"));
if (beatmap.BeatmapInfo.OnlineBeatmapID != null) writer.WriteLine(FormattableString.Invariant($"BeatmapID: {beatmap.BeatmapInfo.OnlineBeatmapID}"));
if (beatmap.BeatmapInfo.BeatmapSet?.OnlineBeatmapSetID != null) writer.WriteLine(FormattableString.Invariant($"BeatmapSetID: {beatmap.BeatmapInfo.BeatmapSet.OnlineBeatmapSetID}"));
}
private void handleDifficulty(TextWriter writer)
{
writer.WriteLine("[Difficulty]");
writer.WriteLine(FormattableString.Invariant($"HPDrainRate: {beatmap.BeatmapInfo.BaseDifficulty.DrainRate}"));
writer.WriteLine(FormattableString.Invariant($"CircleSize: {beatmap.BeatmapInfo.BaseDifficulty.CircleSize}"));
writer.WriteLine(FormattableString.Invariant($"OverallDifficulty: {beatmap.BeatmapInfo.BaseDifficulty.OverallDifficulty}"));
writer.WriteLine(FormattableString.Invariant($"ApproachRate: {beatmap.BeatmapInfo.BaseDifficulty.ApproachRate}"));
// Taiko adjusts the slider multiplier (see: TaikoBeatmapConverter.LEGACY_VELOCITY_MULTIPLIER)
writer.WriteLine(beatmap.BeatmapInfo.RulesetID == 1
? FormattableString.Invariant($"SliderMultiplier: {beatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier / 1.4f}")
: FormattableString.Invariant($"SliderMultiplier: {beatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier}"));
writer.WriteLine(FormattableString.Invariant($"SliderTickRate: {beatmap.BeatmapInfo.BaseDifficulty.SliderTickRate}"));
}
private void handleEvents(TextWriter writer)
{
writer.WriteLine("[Events]");
if (!string.IsNullOrEmpty(beatmap.BeatmapInfo.Metadata.BackgroundFile))
writer.WriteLine(FormattableString.Invariant($"{(int)LegacyEventType.Background},0,\"{beatmap.BeatmapInfo.Metadata.BackgroundFile}\",0,0"));
foreach (var b in beatmap.Breaks)
writer.WriteLine(FormattableString.Invariant($"{(int)LegacyEventType.Break},{b.StartTime},{b.EndTime}"));
}
private void handleControlPoints(TextWriter writer)
{
if (beatmap.ControlPointInfo.Groups.Count == 0)
return;
writer.WriteLine("[TimingPoints]");
foreach (var group in beatmap.ControlPointInfo.Groups)
{
var groupTimingPoint = group.ControlPoints.OfType<TimingControlPoint>().FirstOrDefault();
// If the group contains a timing control point, it needs to be output separately.
if (groupTimingPoint != null)
{
writer.Write(FormattableString.Invariant($"{groupTimingPoint.Time},"));
writer.Write(FormattableString.Invariant($"{groupTimingPoint.BeatLength},"));
outputControlPointEffectsAt(groupTimingPoint.Time, true);
}
// Output any remaining effects as secondary non-timing control point.
var difficultyPoint = beatmap.ControlPointInfo.DifficultyPointAt(group.Time);
writer.Write(FormattableString.Invariant($"{group.Time},"));
writer.Write(FormattableString.Invariant($"{-100 / difficultyPoint.SpeedMultiplier},"));
outputControlPointEffectsAt(group.Time, false);
}
void outputControlPointEffectsAt(double time, bool isTimingPoint)
{
var samplePoint = beatmap.ControlPointInfo.SamplePointAt(time);
var effectPoint = beatmap.ControlPointInfo.EffectPointAt(time);
// Apply the control point to a hit sample to uncover legacy properties (e.g. suffix)
HitSampleInfo tempHitSample = samplePoint.ApplyTo(new ConvertHitObjectParser.LegacyHitSampleInfo(string.Empty));
// Convert effect flags to the legacy format
LegacyEffectFlags effectFlags = LegacyEffectFlags.None;
if (effectPoint.KiaiMode)
effectFlags |= LegacyEffectFlags.Kiai;
if (effectPoint.OmitFirstBarLine)
effectFlags |= LegacyEffectFlags.OmitFirstBarLine;
writer.Write(FormattableString.Invariant($"{(int)beatmap.ControlPointInfo.TimingPointAt(time).TimeSignature},"));
writer.Write(FormattableString.Invariant($"{(int)toLegacySampleBank(tempHitSample.Bank)},"));
writer.Write(FormattableString.Invariant($"{toLegacyCustomSampleBank(tempHitSample)},"));
writer.Write(FormattableString.Invariant($"{tempHitSample.Volume},"));
writer.Write(FormattableString.Invariant($"{(isTimingPoint ? '1' : '0')},"));
writer.Write(FormattableString.Invariant($"{(int)effectFlags}"));
writer.WriteLine();
}
}
private void handleColours(TextWriter writer)
{
var colours = skin?.GetConfig<GlobalSkinColours, IReadOnlyList<Color4>>(GlobalSkinColours.ComboColours)?.Value;
if (colours == null || colours.Count == 0)
return;
writer.WriteLine("[Colours]");
for (var i = 0; i < colours.Count; i++)
{
var comboColour = colours[i];
writer.Write(FormattableString.Invariant($"Combo{i}: "));
writer.Write(FormattableString.Invariant($"{(byte)(comboColour.R * byte.MaxValue)},"));
writer.Write(FormattableString.Invariant($"{(byte)(comboColour.G * byte.MaxValue)},"));
writer.Write(FormattableString.Invariant($"{(byte)(comboColour.B * byte.MaxValue)},"));
writer.Write(FormattableString.Invariant($"{(byte)(comboColour.A * byte.MaxValue)}"));
writer.WriteLine();
}
}
private void handleHitObjects(TextWriter writer)
{
writer.WriteLine("[HitObjects]");
if (beatmap.HitObjects.Count == 0)
return;
foreach (var h in beatmap.HitObjects)
handleHitObject(writer, h);
}
private void handleHitObject(TextWriter writer, HitObject hitObject)
{
Vector2 position = new Vector2(256, 192);
switch (beatmap.BeatmapInfo.RulesetID)
{
case 0:
position = ((IHasPosition)hitObject).Position;
break;
case 2:
position.X = ((IHasXPosition)hitObject).X;
break;
case 3:
int totalColumns = (int)Math.Max(1, beatmap.BeatmapInfo.BaseDifficulty.CircleSize);
position.X = (int)Math.Ceiling(((IHasXPosition)hitObject).X * (512f / totalColumns));
break;
}
writer.Write(FormattableString.Invariant($"{position.X},"));
writer.Write(FormattableString.Invariant($"{position.Y},"));
writer.Write(FormattableString.Invariant($"{hitObject.StartTime},"));
writer.Write(FormattableString.Invariant($"{(int)getObjectType(hitObject)},"));
writer.Write(FormattableString.Invariant($"{(int)toLegacyHitSoundType(hitObject.Samples)},"));
if (hitObject is IHasPath path)
{
addPathData(writer, path, position);
writer.Write(getSampleBank(hitObject.Samples));
}
else
{
if (hitObject is IHasDuration)
addEndTimeData(writer, hitObject);
writer.Write(getSampleBank(hitObject.Samples));
}
writer.WriteLine();
}
private LegacyHitObjectType getObjectType(HitObject hitObject)
{
LegacyHitObjectType type = 0;
if (hitObject is IHasCombo combo)
{
type = (LegacyHitObjectType)(combo.ComboOffset << 4);
if (combo.NewCombo)
type |= LegacyHitObjectType.NewCombo;
}
switch (hitObject)
{
case IHasPath _:
type |= LegacyHitObjectType.Slider;
break;
case IHasDuration _:
if (beatmap.BeatmapInfo.RulesetID == 3)
type |= LegacyHitObjectType.Hold;
else
type |= LegacyHitObjectType.Spinner;
break;
default:
type |= LegacyHitObjectType.Circle;
break;
}
return type;
}
private void addPathData(TextWriter writer, IHasPath pathData, Vector2 position)
{
PathType? lastType = null;
for (int i = 0; i < pathData.Path.ControlPoints.Count; i++)
{
PathControlPoint point = pathData.Path.ControlPoints[i];
if (point.Type.Value != null)
{
// We've reached a new (explicit) segment!
// Explicit segments have a new format in which the type is injected into the middle of the control point string.
// To preserve compatibility with osu-stable as much as possible, explicit segments with the same type are converted to use implicit segments by duplicating the control point.
// One exception are consecutive perfect curves, which aren't supported in osu!stable and can lead to decoding issues if encoded as implicit segments
bool needsExplicitSegment = point.Type.Value != lastType || point.Type.Value == PathType.PerfectCurve;
// Another exception to this is when the last two control points of the last segment were duplicated. This is not a scenario supported by osu!stable.
// Lazer does not add implicit segments for the last two control points of _any_ explicit segment, so an explicit segment is forced in order to maintain consistency with the decoder.
if (i > 1)
{
// We need to use the absolute control point position to determine equality, otherwise floating point issues may arise.
Vector2 p1 = position + pathData.Path.ControlPoints[i - 1].Position.Value;
Vector2 p2 = position + pathData.Path.ControlPoints[i - 2].Position.Value;
if ((int)p1.X == (int)p2.X && (int)p1.Y == (int)p2.Y)
needsExplicitSegment = true;
}
if (needsExplicitSegment)
{
switch (point.Type.Value)
{
case PathType.Bezier:
writer.Write("B|");
break;
case PathType.Catmull:
writer.Write("C|");
break;
case PathType.PerfectCurve:
writer.Write("P|");
break;
case PathType.Linear:
writer.Write("L|");
break;
}
lastType = point.Type.Value;
}
else
{
// New segment with the same type - duplicate the control point
writer.Write(FormattableString.Invariant($"{position.X + point.Position.Value.X}:{position.Y + point.Position.Value.Y}|"));
}
}
if (i != 0)
{
writer.Write(FormattableString.Invariant($"{position.X + point.Position.Value.X}:{position.Y + point.Position.Value.Y}"));
writer.Write(i != pathData.Path.ControlPoints.Count - 1 ? "|" : ",");
}
}
var curveData = pathData as IHasPathWithRepeats;
writer.Write(FormattableString.Invariant($"{(curveData?.RepeatCount ?? 0) + 1},"));
writer.Write(FormattableString.Invariant($"{pathData.Path.Distance},"));
if (curveData != null)
{
for (int i = 0; i < curveData.NodeSamples.Count; i++)
{
writer.Write(FormattableString.Invariant($"{(int)toLegacyHitSoundType(curveData.NodeSamples[i])}"));
writer.Write(i != curveData.NodeSamples.Count - 1 ? "|" : ",");
}
for (int i = 0; i < curveData.NodeSamples.Count; i++)
{
writer.Write(getSampleBank(curveData.NodeSamples[i], true));
writer.Write(i != curveData.NodeSamples.Count - 1 ? "|" : ",");
}
}
}
private void addEndTimeData(TextWriter writer, HitObject hitObject)
{
var endTimeData = (IHasDuration)hitObject;
var type = getObjectType(hitObject);
char suffix = ',';
// Holds write the end time as if it's part of sample data.
if (type == LegacyHitObjectType.Hold)
suffix = ':';
writer.Write(FormattableString.Invariant($"{endTimeData.EndTime}{suffix}"));
}
private string getSampleBank(IList<HitSampleInfo> samples, bool banksOnly = false)
{
LegacySampleBank normalBank = toLegacySampleBank(samples.SingleOrDefault(s => s.Name == HitSampleInfo.HIT_NORMAL)?.Bank);
LegacySampleBank addBank = toLegacySampleBank(samples.FirstOrDefault(s => !string.IsNullOrEmpty(s.Name) && s.Name != HitSampleInfo.HIT_NORMAL)?.Bank);
StringBuilder sb = new StringBuilder();
sb.Append(FormattableString.Invariant($"{(int)normalBank}:"));
sb.Append(FormattableString.Invariant($"{(int)addBank}"));
if (!banksOnly)
{
string customSampleBank = toLegacyCustomSampleBank(samples.FirstOrDefault(s => !string.IsNullOrEmpty(s.Name)));
string sampleFilename = samples.FirstOrDefault(s => string.IsNullOrEmpty(s.Name))?.LookupNames.First() ?? string.Empty;
int volume = samples.FirstOrDefault()?.Volume ?? 100;
sb.Append(':');
sb.Append(FormattableString.Invariant($"{customSampleBank}:"));
sb.Append(FormattableString.Invariant($"{volume}:"));
sb.Append(FormattableString.Invariant($"{sampleFilename}"));
}
return sb.ToString();
}
private LegacyHitSoundType toLegacyHitSoundType(IList<HitSampleInfo> samples)
{
LegacyHitSoundType type = LegacyHitSoundType.None;
foreach (var sample in samples)
{
switch (sample.Name)
{
case HitSampleInfo.HIT_WHISTLE:
type |= LegacyHitSoundType.Whistle;
break;
case HitSampleInfo.HIT_FINISH:
type |= LegacyHitSoundType.Finish;
break;
case HitSampleInfo.HIT_CLAP:
type |= LegacyHitSoundType.Clap;
break;
}
}
return type;
}
private LegacySampleBank toLegacySampleBank(string sampleBank)
{
switch (sampleBank?.ToLowerInvariant())
{
case "normal":
return LegacySampleBank.Normal;
case "soft":
return LegacySampleBank.Soft;
case "drum":
return LegacySampleBank.Drum;
default:
return LegacySampleBank.None;
}
}
private string toLegacyCustomSampleBank(HitSampleInfo hitSampleInfo)
{
if (hitSampleInfo is ConvertHitObjectParser.LegacyHitSampleInfo legacy)
return legacy.CustomSampleBank.ToString(CultureInfo.InvariantCulture);
return "0";
}
}
}
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