video_system/Modules/Camera/Enum/CameraEnum.php

<?php
/**
 * Created by PhpStorm.
 * User: qiuzijian
 * Date: 2021-04-23
 * Time: 15:18
 */

namespace Modules\Camera\Enum;

class CameraEnum
{
    //默认流媒体返回id
    const CAMERA_DEFAULT_REVERT_ID = 'NullId';
}