Round start audio announcement (#8047)

Content.Server/GameTicking/GameTicker.RoundFlow.cs

@@ -1,5 +1,6 @@
 using System.Linq;
 using System.Threading.Tasks;
+using Content.Server.Announcements;
 using Content.Server.GameTicking.Events;
 using Content.Server.Ghost;
 using Content.Server.Maps;
@@ -10,11 +11,13 @@ using Content.Shared.CCVar;
 using Content.Shared.Coordinates;
 using Content.Shared.GameTicking;
 using Content.Shared.Preferences;
+using Content.Shared.Sound;
 using Content.Shared.Station;
 using JetBrains.Annotations;
 using Prometheus;
 using Robust.Server.Maps;
 using Robust.Server.Player;
+using Robust.Shared.Audio;
 using Robust.Shared.Map;
 using Robust.Shared.Network;
 using Robust.Shared.Player;
@@ -214,6 +217,7 @@ namespace Content.Server.GameTicking
             ReqWindowAttentionAll();
             UpdateLateJoinStatus();
             UpdateJobsAvailable();
+            AnnounceRound();
 
 #if EXCEPTION_TOLERANCE
             }
@@ -466,6 +470,25 @@ namespace Content.Server.GameTicking
         {
             return _gameTiming.RealTime.Subtract(_roundStartTimeSpan);
         }
+
+        private void AnnounceRound()
+        {
+            if (_preset == null) return;
+
+            foreach (var proto in _prototypeManager.EnumeratePrototypes<RoundAnnouncementPrototype>())
+            {
+                if (!proto.GamePresets.Contains(_preset.ID)) continue;
+
+                if (proto.Message != null)
+                    _chatManager.DispatchStationAnnouncement(Loc.GetString(proto.Message), playDefaultSound: false);
+
+                if (proto.Sound != null)
+                    SoundSystem.Play(Filter.Broadcast(), proto.Sound.GetSound());
+
+                // Only play one because A
+                break;
+            }
+        }
     }
 
     public enum GameRunLevel