多平台支持的RTSP-Server组件EasyRTSPServer视频流媒体服务平台如何实现主动关闭指定通道？

众所周知，RTSP协议是一个流媒体协议，可以实现直播和点播形式的音频与视频流的播放。

RTSP协议定义了多种服务器-客户端之间交互的接口，主要有OPTIONS，DESCRIBE，SETUP，PLAY，TEARDOWN，RECORD，ANNOUNCE。网络上已经有很多针对RTSP协议的文章，我这里不准备进行过多介绍。RTSP并不包括具体数据的传输，该功能一般由RTP与RTCP协议来实现，并可以通过TCP或UDP两种底层传输方式进行。

EasyRTSPServer实现主动关闭指定通道

提出问题：

在某些特定场景下, 需要主动关闭某一通道对应的所有连接;

解决问题：

#####主动关闭通道API:

Easy_API Easy_I32 Easy_APICALL EasyRtspServer_ResetChannel(EASY_CHANNEL_HANDLE channelHandle);

在API函数中, 仅置标志位为复位(0x01)

        int LiveRtspServer::ResetChannel(RTSP_CHANNEL_HANDLE channelHandle)
        {
            if (channelHandle < 0)            return RTSP_SERVER_ERR_BadArgument;
            if (NULL == pLiveChannel)        return RTSP_SERVER_ERR_NotInitialized;


            LockMutex(&mutexChannel);        //Lock

            LIVE_CHANNEL_OBJ_T    *pStreamChannel = NULL;
            LIVE_CHANNEL_OBJ_T    *pChannel = pLiveChannel;
            while (NULL != pChannel)
            {
                if (pChannel == channelHandle)
                {
                    pStreamChannel = pChannel;
                    break;
                }

                pChannel = pChannel->next;
            }

            if (NULL == pStreamChannel)
            {
                UnlockMutex(&mutexChannel);        //Unlock
                return RTSP_SERVER_ERR_OPERATE;
            }


            ServerMediaSession* sms = RTSPServer::lookupServerMediaSession(NULL, 0, NULL, pStreamChannel->streamName);
            if (NULL != sms)
            {
                pStreamChannel->resetFlag = 0x01;
            }
            else
            {
                memset(&pStreamChannel->mediainfo, 0x00, sizeof(RTSP_MEDIA_INFO_T));
            }

            UnlockMutex(&mutexChannel);        //Unlock

            return RTSP_SERVER_ERR_NoErr;
        }

工作线程中做如下修改:

    BasicTaskScheduler0 *pTaskScheduler0 = NULL;

    if (NULL != pThreadTask->pSubEnv && (pTaskScheduler0 = (BasicTaskScheduler0 *)&pThreadTask->pSubEnv->taskScheduler()))
    {
        if (pThreadTask->pSubEnv->IsResetChannel() > 0x00)                //以下代码为主动关闭当前通道及所对应的客户端
        {
            if (pThreadTask->pSubEnv->IsResetChannel() == 0x01)
            {
                ServerMediaSession* sms = (ServerMediaSession*)pThreadTask->pSubEnv->GetTmpServerMediaSession();
                char streamName[512] = {0};
                if (NULL != sms)
                {
                    strcpy(streamName, sms->streamName());

                    UsageEnvironment *pEnv = &sms->envir();

                    pThreadTask->pSubEnv->ResetChannel(0x02, NULL);

                    if (NULL != pEnv)
                    {
                        pThis->removeServerMediaSession(pEnv, streamName, False);
                    }

                    pThis->closeAllClientSessionsForServerMediaSession(sms);
                    pThis->CloseAllConnections(streamName);
                }


                pThreadTask->pSubEnv->ResetChannel(0x00, NULL);
                pTaskScheduler0->ClearDelayQueue();            //清空队列
            }

            Sleep(10);
            continue;
        }

        int ret = pTaskScheduler0->SingleStep(0, pThreadTask->id, pThreadTask->pSubEnv->GetEnvirName());
        if (ret < 0)
        {
            break;
        }