Apply AudioSource Playback Control To Voices

Util/Audio/Mixer/Voice.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Threading;
 using ADOFAIRenderer.Util.Audio.Clip;
 
 namespace ADOFAIRenderer.Util.Audio.Mixer;
@@ -64,6 +65,12 @@ internal sealed class Voice
     internal bool Loop;
     internal bool Finished;
 
+    /// <summary>
+    /// Playback has ended and the voice was released by the render thread. Readable from any thread;
+    /// the value can lag behind the render thread.
+    /// </summary>
+    public bool IsFinished => Volatile.Read(ref Finished);
+
     /// <summary>Loop length in frames at the output sample rate (source duration * output rate).</summary>
     internal double Period;