mirror of
https://github.com/ppy/osu
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152 lines
5.5 KiB
C#
152 lines
5.5 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.Collections.Generic;
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using System.IO;
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using System.Threading.Tasks;
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using osu.Framework.Allocation;
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using osu.Framework.Audio;
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using osu.Framework.Audio.Track;
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using osu.Framework.Bindables;
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using osu.Framework.Graphics;
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using osu.Framework.IO.Stores;
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using osu.Game.Beatmaps;
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namespace osu.Game.Audio
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{
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public class PreviewTrackManager : Component
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{
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private readonly BindableDouble muteBindable = new BindableDouble();
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private AudioManager audio;
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private PreviewTrackStore trackStore;
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private TrackManagerPreviewTrack current;
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[BackgroundDependencyLoader]
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private void load(AudioManager audio)
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{
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// this is a temporary solution to get around muting ourselves.
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// todo: update this once we have a BackgroundTrackManager or similar.
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trackStore = new PreviewTrackStore(new OnlineStore());
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audio.AddItem(trackStore);
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trackStore.AddAdjustment(AdjustableProperty.Volume, audio.VolumeTrack);
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this.audio = audio;
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}
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/// <summary>
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/// Retrieves a <see cref="PreviewTrack"/> for a <see cref="BeatmapSetInfo"/>.
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/// </summary>
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/// <param name="beatmapSetInfo">The <see cref="BeatmapSetInfo"/> to retrieve the preview track for.</param>
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/// <returns>The playable <see cref="PreviewTrack"/>.</returns>
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public PreviewTrack Get(BeatmapSetInfo beatmapSetInfo)
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{
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var track = CreatePreviewTrack(beatmapSetInfo, trackStore);
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track.Started += () =>
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{
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current?.Stop();
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current = track;
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audio.Tracks.AddAdjustment(AdjustableProperty.Volume, muteBindable);
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};
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track.Stopped += () =>
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{
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current = null;
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audio.Tracks.RemoveAdjustment(AdjustableProperty.Volume, muteBindable);
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};
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return track;
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}
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/// <summary>
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/// Stops any currently playing <see cref="PreviewTrack"/>.
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/// </summary>
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/// <remarks>
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/// Only the immediate owner (an object that implements <see cref="IPreviewTrackOwner"/>) of the playing <see cref="PreviewTrack"/>
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/// can globally stop the currently playing <see cref="PreviewTrack"/>. The object holding a reference to the <see cref="PreviewTrack"/>
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/// can always stop the <see cref="PreviewTrack"/> themselves through <see cref="PreviewTrack.Stop()"/>.
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/// </remarks>
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/// <param name="source">The <see cref="IPreviewTrackOwner"/> which may be the owner of the <see cref="PreviewTrack"/>.</param>
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public void StopAnyPlaying(IPreviewTrackOwner source)
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{
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if (current == null || current.Owner != source)
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return;
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current.Stop();
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current = null;
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}
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/// <summary>
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/// Creates the <see cref="TrackManagerPreviewTrack"/>.
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/// </summary>
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protected virtual TrackManagerPreviewTrack CreatePreviewTrack(BeatmapSetInfo beatmapSetInfo, ITrackStore trackStore) => new TrackManagerPreviewTrack(beatmapSetInfo, trackStore);
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protected class TrackManagerPreviewTrack : PreviewTrack
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{
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public IPreviewTrackOwner Owner { get; private set; }
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private readonly BeatmapSetInfo beatmapSetInfo;
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private readonly ITrackStore trackManager;
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public TrackManagerPreviewTrack(BeatmapSetInfo beatmapSetInfo, ITrackStore trackManager)
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{
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this.beatmapSetInfo = beatmapSetInfo;
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this.trackManager = trackManager;
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}
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[BackgroundDependencyLoader]
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private void load(IPreviewTrackOwner owner)
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{
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Owner = owner;
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}
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protected override Track GetTrack() => trackManager.Get($"https://b.ppy.sh/preview/{beatmapSetInfo?.OnlineBeatmapSetID}.mp3");
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}
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private class PreviewTrackStore : AudioCollectionManager<AdjustableAudioComponent>, ITrackStore
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{
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private readonly IResourceStore<byte[]> store;
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internal PreviewTrackStore(IResourceStore<byte[]> store)
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{
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this.store = store;
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}
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public Track GetVirtual(double length = double.PositiveInfinity)
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{
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if (IsDisposed) throw new ObjectDisposedException($"Cannot retrieve items for an already disposed {nameof(PreviewTrackStore)}");
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var track = new TrackVirtual(length);
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AddItem(track);
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return track;
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}
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public Track Get(string name)
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{
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if (IsDisposed) throw new ObjectDisposedException($"Cannot retrieve items for an already disposed {nameof(PreviewTrackStore)}");
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if (string.IsNullOrEmpty(name)) return null;
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var dataStream = store.GetStream(name);
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if (dataStream == null)
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return null;
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Track track = new TrackBass(dataStream);
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AddItem(track);
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return track;
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}
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public Task<Track> GetAsync(string name) => Task.Run(() => Get(name));
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public Stream GetStream(string name) => store.GetStream(name);
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public IEnumerable<string> GetAvailableResources() => store.GetAvailableResources();
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}
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}
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}
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