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osu-lazer/osu.Game/Overlays/MusicController.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.Collections.Generic;
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using System.Linq;
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using JetBrains.Annotations;
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using osu.Framework.Allocation;
using osu.Framework.Audio;
using osu.Framework.Audio.Track;
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using osu.Framework.Bindables;
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using osu.Framework.Graphics;
using osu.Framework.Graphics.Audio;
using osu.Framework.Graphics.Containers;
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using osu.Framework.Threading;
using osu.Game.Beatmaps;
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using osu.Game.Database;
using osu.Game.Rulesets.Mods;
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namespace osu.Game.Overlays
{
/// <summary>
/// Handles playback of the global music track.
/// </summary>
public class MusicController : CompositeDrawable
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{
[Resolved]
private BeatmapManager beatmaps { get; set; }
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/// <summary>
/// Point in time after which the current track will be restarted on triggering a "previous track" action.
/// </summary>
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private const double restart_cutoff_point = 5000;
/// <summary>
/// Whether the user has requested the track to be paused. Use <see cref="IsPlaying"/> to determine whether the track is still playing.
/// </summary>
public bool UserPauseRequested { get; private set; }
/// <summary>
/// Fired when the global <see cref="WorkingBeatmap"/> has changed.
/// Includes direction information for display purposes.
/// </summary>
public event Action<WorkingBeatmap, TrackChangeDirection> TrackChanged;
[Resolved]
private IBindable<WorkingBeatmap> beatmap { get; set; }
[Resolved]
private IBindable<IReadOnlyList<Mod>> mods { get; set; }
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[NotNull]
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public DrawableTrack CurrentTrack { get; private set; } = new DrawableTrack(new TrackVirtual(1000));
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[Resolved]
private RealmAccess realm { get; set; }
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[BackgroundDependencyLoader]
private void load()
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{
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// Todo: These binds really shouldn't be here, but are unlikely to cause any issues for now.
// They are placed here for now since some tests rely on setting the beatmap _and_ their hierarchies inside their load(), which runs before the MusicController's load().
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beatmap.BindValueChanged(beatmapChanged, true);
mods.BindValueChanged(_ => ResetTrackAdjustments(), true);
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}
/// <summary>
/// Forcefully reload the current <see cref="WorkingBeatmap"/>'s track from disk.
/// </summary>
public void ReloadCurrentTrack() => changeTrack();
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/// <summary>
/// Returns whether the beatmap track is playing.
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/// </summary>
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public bool IsPlaying => CurrentTrack.IsRunning;
/// <summary>
/// Returns whether the beatmap track is loaded.
/// </summary>
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public bool TrackLoaded => CurrentTrack.TrackLoaded;
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private ScheduledDelegate seekDelegate;
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public void SeekTo(double position)
{
seekDelegate?.Cancel();
seekDelegate = Schedule(() =>
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{
if (!beatmap.Disabled)
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CurrentTrack.Seek(position);
});
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}
/// <summary>
/// Ensures music is playing, no matter what, unless the user has explicitly paused.
/// This means that if the current beatmap has a virtual track (see <see cref="TrackVirtual"/>) a new beatmap will be selected.
/// </summary>
public void EnsurePlayingSomething()
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{
if (UserPauseRequested) return;
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if (CurrentTrack.IsDummyDevice || beatmap.Value.BeatmapSetInfo.DeletePending)
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{
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if (beatmap.Disabled)
return;
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NextTrack();
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}
else if (!IsPlaying)
{
Play();
}
}
/// <summary>
/// Start playing the current track (if not already playing).
/// </summary>
/// <param name="restart">Whether to restart the track from the beginning.</param>
/// <param name="requestedByUser">
/// Whether the request to play was issued by the user rather than internally.
/// Specifying <c>true</c> will ensure that other methods like <see cref="EnsurePlayingSomething"/>
/// will resume music playback going forward.
/// </param>
/// <returns>Whether the operation was successful.</returns>
public bool Play(bool restart = false, bool requestedByUser = false)
{
if (requestedByUser)
UserPauseRequested = false;
if (restart)
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CurrentTrack.Restart();
else if (!IsPlaying)
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CurrentTrack.Start();
return true;
}
/// <summary>
/// Stop playing the current track and pause at the current position.
/// </summary>
/// <param name="requestedByUser">
/// Whether the request to stop was issued by the user rather than internally.
/// Specifying <c>true</c> will ensure that other methods like <see cref="EnsurePlayingSomething"/>
/// will not resume music playback until the next explicit call to <see cref="Play"/>.
/// </param>
public void Stop(bool requestedByUser = false)
{
UserPauseRequested |= requestedByUser;
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if (CurrentTrack.IsRunning)
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CurrentTrack.Stop();
}
/// <summary>
/// Toggle pause / play.
/// </summary>
/// <returns>Whether the operation was successful.</returns>
public bool TogglePause()
{
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if (CurrentTrack.IsRunning)
Stop(true);
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else
Play(requestedByUser: true);
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return true;
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}
/// <summary>
/// Play the previous track or restart the current track if it's current time below <see cref="restart_cutoff_point"/>.
/// </summary>
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/// <param name="onSuccess">Invoked when the operation has been performed successfully.</param>
public void PreviousTrack(Action<PreviousTrackResult> onSuccess = null) => Schedule(() =>
{
PreviousTrackResult res = prev();
if (res != PreviousTrackResult.None)
onSuccess?.Invoke(res);
});
/// <summary>
/// Play the previous track or restart the current track if it's current time below <see cref="restart_cutoff_point"/>.
/// </summary>
/// <returns>The <see cref="PreviousTrackResult"/> that indicate the decided action.</returns>
private PreviousTrackResult prev()
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{
if (beatmap.Disabled)
return PreviousTrackResult.None;
double currentTrackPosition = CurrentTrack.CurrentTime;
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if (currentTrackPosition >= restart_cutoff_point)
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{
SeekTo(0);
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return PreviousTrackResult.Restart;
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}
queuedDirection = TrackChangeDirection.Prev;
var playableSet = getBeatmapSets().AsEnumerable().TakeWhile(i => !i.Equals(current.BeatmapSetInfo)).LastOrDefault()
?? getBeatmapSets().LastOrDefault();
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if (playableSet != null)
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{
changeBeatmap(beatmaps.GetWorkingBeatmap(playableSet.Beatmaps.First()));
restartTrack();
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return PreviousTrackResult.Previous;
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}
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return PreviousTrackResult.None;
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}
/// <summary>
/// Play the next random or playlist track.
/// </summary>
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/// <param name="onSuccess">Invoked when the operation has been performed successfully.</param>
/// <returns>A <see cref="ScheduledDelegate"/> of the operation.</returns>
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public void NextTrack(Action onSuccess = null) => Schedule(() =>
{
bool res = next();
if (res)
onSuccess?.Invoke();
});
private bool next()
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{
if (beatmap.Disabled)
return false;
queuedDirection = TrackChangeDirection.Next;
var playableSet = getBeatmapSets().AsEnumerable().SkipWhile(i => !i.Equals(current.BeatmapSetInfo)).ElementAtOrDefault(1)
?? getBeatmapSets().FirstOrDefault();
var playableBeatmap = playableSet?.Beatmaps.FirstOrDefault();
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if (playableBeatmap != null)
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{
changeBeatmap(beatmaps.GetWorkingBeatmap(playableBeatmap));
restartTrack();
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return true;
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}
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return false;
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}
private void restartTrack()
{
// if not scheduled, the previously track will be stopped one frame later (see ScheduleAfterChildren logic in GameBase).
// we probably want to move this to a central method for switching to a new working beatmap in the future.
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Schedule(() => CurrentTrack.Restart());
}
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private WorkingBeatmap current;
private TrackChangeDirection? queuedDirection;
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private IQueryable<BeatmapSetInfo> getBeatmapSets() => realm.Realm.All<BeatmapSetInfo>().Where(s => !s.DeletePending);
private void beatmapChanged(ValueChangedEvent<WorkingBeatmap> beatmap) => changeBeatmap(beatmap.NewValue);
private void changeBeatmap(WorkingBeatmap newWorking)
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{
// This method can potentially be triggered multiple times as it is eagerly fired in next() / prev() to ensure correct execution order
// (changeBeatmap must be called before consumers receive the bindable changed event, which is not the case when the local beatmap bindable is updated directly).
if (newWorking == current)
return;
var lastWorking = current;
TrackChangeDirection direction = TrackChangeDirection.None;
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bool audioEquals = newWorking?.BeatmapInfo?.AudioEquals(current?.BeatmapInfo) ?? false;
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if (current != null)
{
if (audioEquals)
direction = TrackChangeDirection.None;
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else if (queuedDirection.HasValue)
{
direction = queuedDirection.Value;
queuedDirection = null;
}
else
{
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// figure out the best direction based on order in playlist.
int last = getBeatmapSets().AsEnumerable().TakeWhile(b => !b.Equals(current.BeatmapSetInfo)).Count();
int next = newWorking == null ? -1 : getBeatmapSets().AsEnumerable().TakeWhile(b => !b.Equals(newWorking.BeatmapSetInfo)).Count();
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direction = last > next ? TrackChangeDirection.Prev : TrackChangeDirection.Next;
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}
}
current = newWorking;
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if (!audioEquals || CurrentTrack.IsDummyDevice)
{
changeTrack();
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}
else
{
// transfer still valid track to new working beatmap
current.TransferTrack(lastWorking.Track);
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}
TrackChanged?.Invoke(current, direction);
ResetTrackAdjustments();
queuedDirection = null;
// this will be a noop if coming from the beatmapChanged event.
// the exception is local operations like next/prev, where we want to complete loading the track before sending out a change.
if (beatmap.Value != current && beatmap is Bindable<WorkingBeatmap> working)
working.Value = current;
}
private void changeTrack()
{
var queuedTrack = getQueuedTrack();
var lastTrack = CurrentTrack;
CurrentTrack = queuedTrack;
// At this point we may potentially be in an async context from tests. This is extremely dangerous but we have to make do for now.
// CurrentTrack is immediately updated above for situations where a immediate knowledge about the new track is required,
// but the mutation of the hierarchy is scheduled to avoid exceptions.
Schedule(() =>
{
lastTrack.VolumeTo(0, 500, Easing.Out).Expire();
if (queuedTrack == CurrentTrack)
{
AddInternal(queuedTrack);
queuedTrack.VolumeTo(0).Then().VolumeTo(1, 300, Easing.Out);
}
else
{
// If the track has changed since the call to changeTrack, it is safe to dispose the
// queued track rather than consume it.
queuedTrack.Dispose();
}
});
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}
private DrawableTrack getQueuedTrack()
{
// Important to keep this in its own method to avoid inadvertently capturing unnecessary variables in the callback.
// Can lead to leaks.
var queuedTrack = new DrawableTrack(current.LoadTrack());
queuedTrack.Completed += () => onTrackCompleted(current);
return queuedTrack;
}
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private void onTrackCompleted(WorkingBeatmap workingBeatmap)
{
// the source of track completion is the audio thread, so the beatmap may have changed before firing.
if (current != workingBeatmap)
return;
if (!CurrentTrack.Looping && !beatmap.Disabled)
NextTrack();
}
private bool allowTrackAdjustments;
/// <summary>
/// Whether mod track adjustments are allowed to be applied.
/// </summary>
public bool AllowTrackAdjustments
{
get => allowTrackAdjustments;
set
{
if (allowTrackAdjustments == value)
return;
allowTrackAdjustments = value;
ResetTrackAdjustments();
}
}
/// <summary>
/// Resets the adjustments currently applied on <see cref="CurrentTrack"/> and applies the mod adjustments if <see cref="AllowTrackAdjustments"/> is <c>true</c>.
/// </summary>
/// <remarks>
/// Does not reset any adjustments applied directly to the beatmap track.
/// </remarks>
public void ResetTrackAdjustments()
{
CurrentTrack.RemoveAllAdjustments(AdjustableProperty.Balance);
CurrentTrack.RemoveAllAdjustments(AdjustableProperty.Frequency);
CurrentTrack.RemoveAllAdjustments(AdjustableProperty.Tempo);
CurrentTrack.RemoveAllAdjustments(AdjustableProperty.Volume);
if (allowTrackAdjustments)
{
foreach (var mod in mods.Value.OfType<IApplicableToTrack>())
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mod.ApplyToTrack(CurrentTrack);
}
}
}
public enum TrackChangeDirection
{
None,
Next,
Prev
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}
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public enum PreviousTrackResult
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{
None,
Restart,
Previous
}
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}