Some cleanup to internal sounds handling

src/pocketmine/level/sound/LevelEventSound.php

@@ -0,0 +1,59 @@
+<?php
+
+/*
+ *
+ *  ____            _        _   __  __ _                  __  __ ____
+ * |  _ \ ___   ___| | _____| |_|  \/  (_)_ __   ___      |  \/  |  _ \
+ * | |_) / _ \ / __| |/ / _ \ __| |\/| | | '_ \ / _ \_____| |\/| | |_) |
+ * |  __/ (_) | (__|   <  __/ |_| |  | | | | | |  __/_____| |  | |  __/
+ * |_|   \___/ \___|_|\_\___|\__|_|  |_|_|_| |_|\___|     |_|  |_|_|
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * @author PocketMine Team
+ * @link http://www.pocketmine.net/
+ *
+ *
+*/
+
+declare(strict_types=1);
+
+namespace pocketmine\level\sound;
+
+use pocketmine\math\Vector3;
+use pocketmine\network\mcpe\protocol\LevelEventPacket;
+
+/**
+ * @internal
+ */
+abstract class LevelEventSound extends Sound{
+
+	/** @var float */
+	protected $pitch = 0;
+
+	public function __construct(float $pitch = 0){
+		$this->pitch = $pitch * 1000;
+	}
+
+	abstract protected function getLevelEventId() : int;
+
+	public function getPitch() : float{
+		return $this->pitch / 1000;
+	}
+
+	public function setPitch(float $pitch) : void{
+		$this->pitch = $pitch * 1000;
+	}
+
+	public function encode(Vector3 $pos){
+		$pk = new LevelEventPacket;
+		$pk->evid = $this->getLevelEventId();
+		$pk->position = $pos;
+		$pk->data = (int) $this->pitch;
+
+		return $pk;
+	}
+}