cancellable audio

Robust.Server/Audio/AudioSystem.cs

@@ -101,6 +101,11 @@ public override (EntityUid Entity, AudioComponent Component)? PlayEntity(string?
         if (TerminatingOrDeleted(uid))
             return null;
 
+        var ev = new AudioPlayAttempt();
+        RaiseLocalEvent(uid, ev, false);
+        if (ev.Cancelled)
+            return null;
+
         var entity = SetupAudio(filename, audioParams);
         // Move it after setting it up
         XformSystem.SetCoordinates(entity, new EntityCoordinates(uid, Vector2.Zero));
@@ -118,6 +123,11 @@ public override (EntityUid Entity, AudioComponent Component)? PlayPvs(string? fi
         if (TerminatingOrDeleted(uid))
             return null;
 
+        var ev = new AudioPlayAttempt();
+        RaiseLocalEvent(uid, ev, false);
+        if (ev.Cancelled)
+            return null;
+
         var entity = SetupAudio(filename, audioParams);
         XformSystem.SetCoordinates(entity, new EntityCoordinates(uid, Vector2.Zero));
 
@@ -162,6 +172,7 @@ public override (EntityUid Entity, AudioComponent Component)? PlayPvs(string? fi
         if (!coordinates.IsValid(EntityManager))
             return null;
 
+
         // TODO: Transform TryFindGridAt mess + optimisation required.
         var entity = SetupAudio(filename, audioParams);
         XformSystem.SetCoordinates(entity, coordinates);

Robust.Shared/Audio/Components/AudioComponent.cs

@@ -275,3 +275,8 @@ public enum AudioFlags : byte
 
     NoOcclusion = 1 << 1,
 }
+
+/// <summary>
+/// Raised directed at an entity, which is emitting the audio. Raised only when audio played at the entity itself, not the coordinates.
+/// </summary>
+public sealed class AudioPlayAttempt : CancellableEntityEventArgs;