Workaround for goat horns on the client side

core/src/main/java/org/geysermc/geyser/session/cache/WorldCache.java

@@ -34,6 +34,7 @@ import lombok.Setter;
 import org.checkerframework.checker.nullness.qual.Nullable;
 import org.cloudburstmc.math.vector.Vector3i;
 import org.cloudburstmc.protocol.bedrock.packet.SetTitlePacket;
+import org.geysermc.geyser.item.type.Item;
 import org.geysermc.geyser.scoreboard.Scoreboard;
 import org.geysermc.geyser.scoreboard.ScoreboardUpdater.ScoreboardSession;
 import org.geysermc.geyser.session.GeyserSession;
@@ -70,6 +71,8 @@ public final class WorldCache {
     @Setter
     private boolean editingSignOnFront;
 
+    private final Object2IntMap<Item> activeCooldowns = new Object2IntOpenHashMap<>(2);
+
     public WorldCache(GeyserSession session) {
         this.session = session;
         this.scoreboard = new Scoreboard(session);
@@ -201,4 +204,32 @@ public final class WorldCache {
     public String removeActiveRecord(Vector3i pos) {
         return this.activeRecords.remove(pos);
     }
+
+    public void setCooldown(Item item, int ticks) {
+        if (ticks == 0) {
+            // As of Java 1.21
+            this.activeCooldowns.removeInt(item);
+            return;
+        }
+        this.activeCooldowns.put(item, session.getTicks() + ticks);
+    }
+
+    public boolean hasCooldown(Item item) {
+        return this.activeCooldowns.containsKey(item);
+    }
+
+    public void tick() {
+        // Implementation note: technically we could empty the field during hasCooldown checks,
+        // but we don't want the cooldown field to balloon in size from overuse.
+        if (!this.activeCooldowns.isEmpty()) {
+            int ticks = session.getTicks();
+            Iterator<Object2IntMap.Entry<Item>> it = Object2IntMaps.fastIterator(this.activeCooldowns);
+            while (it.hasNext()) {
+                Object2IntMap.Entry<Item> entry = it.next();
+                if (entry.getIntValue() <= ticks) {
+                    it.remove();
+                }
+            }
+        }
+    }
 }

core/src/main/java/org/geysermc/geyser/translator/protocol/bedrock/BedrockInventoryTransactionTranslator.java

@@ -31,6 +31,7 @@ import org.cloudburstmc.math.vector.Vector3d;
 import org.cloudburstmc.math.vector.Vector3f;
 import org.cloudburstmc.math.vector.Vector3i;
 import org.cloudburstmc.protocol.bedrock.data.LevelEvent;
+import org.cloudburstmc.protocol.bedrock.data.SoundEvent;
 import org.cloudburstmc.protocol.bedrock.data.definitions.BlockDefinition;
 import org.cloudburstmc.protocol.bedrock.data.definitions.ItemDefinition;
 import org.cloudburstmc.protocol.bedrock.data.inventory.ContainerType;
@@ -42,6 +43,7 @@ import org.cloudburstmc.protocol.bedrock.data.inventory.transaction.LegacySetIte
 import org.cloudburstmc.protocol.bedrock.packet.ContainerOpenPacket;
 import org.cloudburstmc.protocol.bedrock.packet.InventoryTransactionPacket;
 import org.cloudburstmc.protocol.bedrock.packet.LevelEventPacket;
+import org.cloudburstmc.protocol.bedrock.packet.LevelSoundEventPacket;
 import org.cloudburstmc.protocol.bedrock.packet.UpdateBlockPacket;
 import org.geysermc.geyser.entity.EntityDefinitions;
 import org.geysermc.geyser.entity.type.Entity;
@@ -75,12 +77,15 @@ import org.geysermc.geyser.util.CooldownUtils;
 import org.geysermc.geyser.util.EntityUtils;
 import org.geysermc.geyser.util.InteractionResult;
 import org.geysermc.geyser.util.InventoryUtils;
+import org.geysermc.mcprotocollib.protocol.data.game.Holder;
 import org.geysermc.mcprotocollib.protocol.data.game.entity.object.Direction;
 import org.geysermc.mcprotocollib.protocol.data.game.entity.player.GameMode;
 import org.geysermc.mcprotocollib.protocol.data.game.entity.player.Hand;
 import org.geysermc.mcprotocollib.protocol.data.game.entity.player.InteractAction;
 import org.geysermc.mcprotocollib.protocol.data.game.entity.player.PlayerAction;
 import org.geysermc.mcprotocollib.protocol.data.game.item.ItemStack;
+import org.geysermc.mcprotocollib.protocol.data.game.item.component.DataComponentType;
+import org.geysermc.mcprotocollib.protocol.data.game.item.component.Instrument;
 import org.geysermc.mcprotocollib.protocol.packet.ingame.serverbound.inventory.ServerboundContainerClickPacket;
 import org.geysermc.mcprotocollib.protocol.packet.ingame.serverbound.player.ServerboundInteractPacket;
 import org.geysermc.mcprotocollib.protocol.packet.ingame.serverbound.player.ServerboundMovePlayerPosRotPacket;
@@ -373,6 +378,22 @@ public class BedrockInventoryTransactionTranslator extends PacketTranslator<Inve
                                 break;
                             } else if (packet.getItemInHand().getDefinition() == session.getItemMappings().getStoredItems().writtenBook().getBedrockDefinition()) {
                                 session.setCurrentBook(packet.getItemInHand());
+                            } else if (session.getPlayerInventory().getItemInHand().asItem() == Items.GOAT_HORN) {
+                                // Temporary workaround while we don't have full item/block use tracking.
+                                if (!session.getWorldCache().hasCooldown(Items.GOAT_HORN)) {
+                                    Holder<Instrument> instrument = session.getPlayerInventory()
+                                        .getItemInHand()
+                                        .getComponent(DataComponentType.INSTRUMENT);
+                                    if (instrument != null && instrument.isId()) {
+                                        // BDS uses a LevelSoundEvent2Packet, but that doesn't work here... (as of 1.21.20)
+                                        LevelSoundEventPacket soundPacket = new LevelSoundEventPacket();
+                                        soundPacket.setSound(SoundEvent.valueOf("GOAT_CALL_" + instrument.id()));
+                                        soundPacket.setPosition(session.getPlayerEntity().getPosition());
+                                        soundPacket.setIdentifier("minecraft:player");
+                                        soundPacket.setExtraData(-1);
+                                        session.sendUpstreamPacket(soundPacket);
+                                    }
+                                }
                             }
                         }
 

core/src/main/java/org/geysermc/geyser/translator/protocol/java/level/JavaCooldownTranslator.java

@@ -57,5 +57,7 @@ public class JavaCooldownTranslator extends PacketTranslator<ClientboundCooldown
             bedrockPacket.setCooldownDuration(packet.getCooldownTicks());
             session.sendUpstreamPacket(bedrockPacket);
         }
+
+        session.getWorldCache().setCooldown(item, packet.getCooldownTicks());
     }
 }