Apply AudioSource Playback Control To Voices

Util/Audio/OfflineAudioMixer.cs

@@ -32,6 +32,9 @@ internal sealed class OfflineAudioMixer : IDisposable
     /// <summary>Additional gain of effect sounds (registered with <see cref="RegisterSoundEvent"/>).</summary>
     private const double EffectVolume = 2.0 / 3.0;
 
+    /// <summary>Number of tracked effect voices at which finished ones are removed from the list used by <see cref="StopAllEffects"/>.</summary>
+    private const int EffectVoicePruneCount = 1024;
+
     /// <summary>Longest wait for a commit before checking for cancellation again, in milliseconds.</summary>
     private const int CommitWaitMs = 50;
 
@@ -45,6 +48,7 @@ internal sealed class OfflineAudioMixer : IDisposable
 
     // Main thread.
     private ConditionalWeakTable<AudioSource, Voice> _sourceVoices = new();
+    private readonly List<Voice> _effectVoices = new();
     private AudioClipSource? _bgmSource;
     private string _bgmKey = "";
     private Voice? _bgmVoice;
@@ -182,16 +186,26 @@ internal sealed class OfflineAudioMixer : IDisposable
     /// Starts an effect sound at <paramref name="startTime"/>. An <paramref name="endTime"/> of 0 or more makes it loop until then.
     /// <paramref name="source"/> (when given) is mapped to the voice for later changes through the AudioSource.
     /// </summary>
-    public void RegisterSoundEvent(AudioSource? source, string clipName, double startTime, double endTime, float volume, float pitch, double now)
+    public Voice RegisterSoundEvent(AudioSource? source, string clipName, double startTime, double endTime, float volume, float pitch, double now)
     {
         var clipSource = GetOrAddSource(clipName);
         var loop = endTime >= 0;
         var voice = _mixer.Play(clipSource, clipName, startTime, volume * ClipVolume * EffectVolume, pitch, loop, now);
         if (loop) voice.SetEndTime(endTime, now);
 
-        if (!source) return;
-        _sourceVoices.Remove(source!);
-        _sourceVoices.Add(source!, voice);
+        if (_effectVoices.Count >= EffectVoicePruneCount)
+            _effectVoices.RemoveAll(v => v.IsFinished);
+        _effectVoices.Add(voice);
+
+        if (source) MapSource(source!, voice);
+        return voice;
+    }
+
+    /// <summary>Maps <paramref name="source"/> to <paramref name="voice"/> for later changes through the AudioSource (replaces an earlier mapping).</summary>
+    public void MapSource(AudioSource source, Voice voice)
+    {
+        _sourceVoices.Remove(source);
+        _sourceVoices.Add(source, voice);
     }
 
     /// <summary>Voice started for <paramref name="source"/> by <see cref="RegisterSoundEvent"/>.</summary>
@@ -203,6 +217,19 @@ internal sealed class OfflineAudioMixer : IDisposable
 
     public bool RemoveSourceMapping(AudioSource source) => _sourceVoices.Remove(source);
 
+    /// <summary>
+    /// Stops every effect sound at <paramref name="now"/>, including ones scheduled to start later
+    /// (AudioManager.StopAllSounds destroys every AudioSource in liveSources, which holds the sources of
+    /// AudioManager._Play and scrConductor.PlayWithEndTime). The song voice keeps playing.
+    /// </summary>
+    public void StopAllEffects(double now)
+    {
+        foreach (var voice in _effectVoices)
+            voice.Stop(now);
+        _effectVoices.Clear();
+        _sourceVoices = new ConditionalWeakTable<AudioSource, Voice>();
+    }
+
     /// <summary>
     /// Marks every command with a time before <paramref name="time"/> as queued
     /// (called after each frame with the time of the next frame).
@@ -312,5 +339,6 @@ internal sealed class OfflineAudioMixer : IDisposable
                 filter.Reset();
         }
         _sourceVoices = new ConditionalWeakTable<AudioSource, Voice>();
+        _effectVoices.Clear();
     }
 }