feat:支持代理拉流状态检测，离线查询流是否离线

chenzhangyue

2023-10-11 f5d89e06a3915a7e3d0032673f2849a42449c190

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package com.genersoft.iot.vmp.service.bean;
 
public interface PlayBackCallback<T> {
 
    void call(PlayBackResult<T> msg);
 
}