Silence a player's walking.

SilentWalkers.java

package com.comphenix.example;

import org.bukkit.Location;
import org.bukkit.World;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

import com.comphenix.protocol.Packets;
import com.comphenix.protocol.ProtocolLibrary;
import com.comphenix.protocol.events.ConnectionSide;
import com.comphenix.protocol.events.PacketAdapter;
import com.comphenix.protocol.events.PacketContainer;
import com.comphenix.protocol.events.PacketEvent;

public class SilentWalkers extends JavaPlugin {
    @Override
    public void onEnable() {
        ProtocolLibrary.getProtocolManager().addPacketListener(
            new PacketAdapter(this, ConnectionSide.SERVER_SIDE, Packets.Server.NAMED_SOUND_EFFECT) {
                @Override
                public void onPacketSending(PacketEvent event) {
                    PacketContainer packet = event.getPacket();
                    World world = event.getPlayer().getWorld();
                    
                    String soundName = packet.getStrings().read(0);
                    double x = (packet.getIntegers().read(0) / 8.0);
                    double y = (packet.getIntegers().read(1) / 8.0);
                    double z = (packet.getIntegers().read(2) / 8.0);
                    Location loc = new Location(world, x, y, z);
                    
                    if (soundName.startsWith("step.")) {
                        Player closest = null;
                        double bestDistance = Double.MAX_VALUE;
                        
                        // Find the player closest to the sound
                        for (Player player : world.getPlayers()) {
                            double distance = player.getLocation().distance(loc);
                            
                            if (distance < bestDistance) {
                                bestDistance = distance;
                                closest = player;
                            }
                        }
                    
                        System.out.println("Cancelled " + soundName + " caused by " + closest);
                        event.setCancelled(true);
                    }
                }
            });
    }
}