fix typo and broken url

Dectinc Chen

2021-04-16 681351d74040d64024c924a6d7da4e17b96d6a38

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package com.genersoft.iot.vmp.gb28181.session; 
 
import java.util.concurrent.ConcurrentHashMap; 
 
import javax.sip.ClientTransaction; 
 
import org.springframework.stereotype.Component; 
 
/**     
 * @Description:视频流session管理器，管理视频预览、预览回放的通信句柄  
 * @author: swwheihei 
 * @date:   2020年5月13日 下午4:03:02      
 */ 
@Component 
public class VideoStreamSessionManager { 
 
    private ConcurrentHashMap<String, ClientTransaction> sessionMap = new ConcurrentHashMap<>(); 
    private ConcurrentHashMap<String, String> ssrcMap = new ConcurrentHashMap<>(); 
 
    public String createPlaySsrc(){ 
        return SsrcUtil.getPlaySsrc(); 
    } 
     
    public String createPlayBackSsrc(){ 
        return SsrcUtil.getPlayBackSsrc(); 
    } 
     
    public void put(String streamId,String ssrc,ClientTransaction transaction){ 
        sessionMap.put(streamId, transaction); 
        ssrcMap.put(streamId, ssrc); 
    } 
     
    public ClientTransaction get(String streamId){ 
        return sessionMap.get(streamId); 
    } 
     
    public void remove(String streamId) { 
        sessionMap.remove(streamId); 
        SsrcUtil.releaseSsrc(ssrcMap.get(streamId)); 
        ssrcMap.remove(streamId); 
    } 
}