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GB/T28181-2022实时流的传输方式介绍#xff1a;https://blog.csdn.net/www_dong/article/details/134255185
基于jrtplib实现tcp被动和主动收流介绍#xff1a;https://blog.csdn.net/www_dong/article/details/134451387
本文主要介绍下级平台或设备发流功能#…前言
GB/T28181-2022实时流的传输方式介绍https://blog.csdn.net/www_dong/article/details/134255185
基于jrtplib实现tcp被动和主动收流介绍https://blog.csdn.net/www_dong/article/details/134451387
本文主要介绍下级平台或设备发流功能用于对接特定的SIP服务器或上级平台。
UDP发流
流程图 发送端流程
初始化rtp参数裸流数据做PS复用组RTP包发送
设计
初始化rtp参数
int CUdp::InitRtp_()
{RTPSessionParams sessionParams;sessionParams.SetMinimumRTCPTransmissionInterval(10);sessionParams.SetOwnTimestampUnit(1.0 / 90000.0);sessionParams.SetAcceptOwnPackets(true);sessionParams.SetMaximumPacketSize(1450);RTPUDPv4TransmissionParams transParams;transParams.SetRTPSendBuffer(2*1024*1024);transParams.SetBindIP(m_ip);transParams.SetPortbase((uint16_t)m_port);if (0 ! Create(sessionParams, transParams)){return -1;}SetDefaultPayloadType((uint8_t)m_payload);SetDefaultTimestampIncrement(3600);SetDefaultMark(true);RTPIPv4Address addr(ntohl(inet_addr(m_ip), (uint16_t)m_port);if(0 ! AddDestination(addr)){return -1;}return 0;
}流数据复用为PS
// 使用ireader开源库进行ps复用
// 初始化
CData2PS::CData2PS()
{struct ps_muxer_func_t func;func.alloc Alloc;func.free Free;func.write Packet;m_ps ps_muxer_create(func, this);// TODO codecid待补充m_ps_stream ps_muxer_add_stream(m_ps, PSI_STREAM_H264, nullptr, 0);
}// 塞数据
int CData2PS::InputData(void* data, int len)
{if (!m_ps)return -1;uint64_t clock time64_now();if (0 m_ps_clock)m_ps_clock clock;return ps_muxer_input(m_ps, m_ps_stream, 0, (clock - m_ps_clock) * 90, (clock - m_ps_clock) * 90, data, len);
}发送rtp包
// 调用jrtplib中SendPacket(data, len);接口发送数据// 以下为SendPacket部分源码
// 主要流程:
// 1. 构建packet
// 2. 发送rtp数据
int RTPSession::SendPacket(const void *data,size_t len,uint8_t pt,bool mark,uint32_t timestampinc)
{int status;if (!created)return ERR_RTP_SESSION_NOTCREATED;BUILDER_LOCKif ((status packetbuilder.BuildPacket(data,len,pt,mark,timestampinc)) 0){BUILDER_UNLOCKreturn status;}if ((status SendRTPData(packetbuilder.GetPacket(),packetbuilder.GetPacketLength())) 0){BUILDER_UNLOCKreturn status;}BUILDER_UNLOCKSOURCES_LOCKsources.SentRTPPacket();SOURCES_UNLOCKPACKSENT_LOCKsentpackets true;PACKSENT_UNLOCKreturn 0;
}// 构建包
int RTPPacketBuilder::PrivateBuildPacket(const void *data,size_t len,uint8_t pt,bool mark,uint32_t timestampinc,bool gotextension,uint16_t hdrextID,const void *hdrextdata,size_t numhdrextwords)
{RTPPacket p(pt,data,len,seqnr,timestamp,ssrc,mark,numcsrcs,csrcs,gotextension,hdrextID,(uint16_t)numhdrextwords,hdrextdata,buffer,maxpacksize,GetMemoryManager());int status p.GetCreationError();if (status 0)return status;packetlength p.GetPacketLength();if (numpackets 0) // first packet{lastwallclocktime RTPTime::CurrentTime();lastrtptimestamp timestamp;prevrtptimestamp timestamp;}else if (timestamp ! prevrtptimestamp){lastwallclocktime RTPTime::CurrentTime();lastrtptimestamp timestamp;prevrtptimestamp timestamp;}numpayloadbytes (uint32_t)p.GetPayloadLength();numpackets;timestamp timestampinc;seqnr;return 0;
}// 发送包
int RTPSession::SendRTPData(const void *data, size_t len)
{if (!m_changeOutgoingData)return rtptrans-SendRTPData(data, len);void *pSendData 0;size_t sendLen 0;int status 0;status OnChangeRTPOrRTCPData(data, len, true, pSendData, sendLen);if (status 0)return status;if (pSendData){status rtptrans-SendRTPData(pSendData, sendLen);OnSentRTPOrRTCPData(pSendData, sendLen, true);}return status;
}// 底层实现
int RTPUDPv4Transmitter::SendRTPData(const void *data,size_t len)
{if (!init)return ERR_RTP_UDPV4TRANS_NOTINIT;MAINMUTEX_LOCKif (!created){MAINMUTEX_UNLOCKreturn ERR_RTP_UDPV4TRANS_NOTCREATED;}if (len maxpacksize){MAINMUTEX_UNLOCKreturn ERR_RTP_UDPV4TRANS_SPECIFIEDSIZETOOBIG;}destinations.GotoFirstElement();while (destinations.HasCurrentElement()){// 调用sendto函数实现udp包的发送sendto(rtpsock,(const char *)data,len,0,(const struct sockaddr *)destinations.GetCurrentElement().GetRTPSockAddr(),sizeof(struct sockaddr_in));destinations.GotoNextElement();}MAINMUTEX_UNLOCKreturn 0;
}tcp passive发流
流程图 发送端流程
上级平台或sip服务器以主动方式连接对于下级平台或者设备数据发送端为被动方式下级平台或者设备数据发送端启动端口监听接收上级平台或sip服务器tcp连接请求向上级平台或sip服务器发送流数据
设计
创建socket、bind、listen启动数据接收线程
// TcpServer为封装的socket类int CGBTcpServer::Start()
{if (0 ! m_localPort || m_tcpServer.get())return 0;int ret -1;do {m_tcpServer std::make_sharedTcpServer(nullptr, this);if (!m_tcpServer.get())break;ret m_tcpServer-TcpCreate();if (0 ! ret)break;ret m_tcpServer-TcpBind(m_localPort);if (0 ! ret)break;ret m_tcpServer-TcpListen(5);if (0 ! ret)break;m_thread std::thread(TCPData2PSThread, this);return 0;} while (0);Stop();return ret;
}在线程内等待连接连接成功后接收数据并回调至应用层处理
void CGBTcpServer::TCPData2PSWorker()
{if (!m_pspacker)m_pspacker new(std::nothrow) CData2PS(PSTCPDataCB, this);bool bAccept false;while (m_running){if (!bAccept){if (0 m_tcpServer-TcpAccept()){bAccept true;if (0 ! InitRtp_()){break;}}continue;}std::this_thread::sleep_for(std::chrono::seconds(1));}
}初始化rtp参数
int CGBTcpServer::InitRtp_()
{const int packetSize 45678;RTPSessionParams sessionparams;sessionparams.SetProbationType(RTPSources::NoProbation);sessionparams.SetOwnTimestampUnit(1.0 / packetSize);sessionparams.SetMaximumPacketSize(packetSize 64);m_rtpTcpTransmitter new RTPTCPTransmitter(nullptr);m_rtpTcpTransmitter-Init(true);m_rtpTcpTransmitter-Create(65535, 0);int status Create(sessionparams, m_rtpTcpTransmitter);if (status 0){return status;}status AddDestination(RTPTCPAddress(m_tcpServer-GetClientSocket()));if (0 ! status)return status;SetDefaultPayloadType(96);SetDefaultMark(false);SetDefaultTimestampIncrement(160);return 0;
}将数据复用为PStcp方式发包
// 调用jrtplib中SendPacket(data, len);接口发送数据// 以下为tcp方式SendPacket部分源码
int RTPTCPTransmitter::SendRTPData(const void *data,size_t len)
{return SendRTPRTCPData(data, len);
}int RTPTCPTransmitter::SendRTPRTCPData(const void *data, size_t len)
{if (!m_init)return ERR_RTP_TCPTRANS_NOTINIT;MAINMUTEX_LOCKif (!m_created){MAINMUTEX_UNLOCKreturn ERR_RTP_TCPTRANS_NOTCREATED;}// #define RTPTCPTRANS_MAXPACKSIZE 65535if (len RTPTCPTRANS_MAXPACKSIZE){MAINMUTEX_UNLOCKreturn ERR_RTP_TCPTRANS_SPECIFIEDSIZETOOBIG;}std::mapSocketType, SocketData::iterator it m_destSockets.begin();std::mapSocketType, SocketData::iterator end m_destSockets.end();vectorSocketType errSockets;int flags 0;
#ifdef RTP_HAVE_MSG_NOSIGNALflags MSG_NOSIGNAL;
#endif // RTP_HAVE_MSG_NOSIGNALwhile (it ! end){uint8_t lengthBytes[2] { (uint8_t)((len 8)0xff), (uint8_t)(len0xff) };SocketType sock it-first;// 调用send接口发送数据// 1. 先发送2字节头(固定格式)// 2. 再发送数据if (send(sock,(const char *)lengthBytes,2,flags) 0 ||send(sock,(const char *)data,len,flags) 0)errSockets.push_back(sock);it;}MAINMUTEX_UNLOCKif (errSockets.size() ! 0){for (size_t i 0 ; i errSockets.size() ; i)OnSendError(errSockets[i]);}// Dont return an error code to avoid the poll thread exiting// due to one closed connection for examplereturn 0;
}tcp active发流
流程图 发送端流程
上级平台或sip服务器启动tcp监听连接对于下级平台或者设备数据发送端为主动方式下级平台或者设备数据发送端发起tcp连接接收上级平台或sip服务器tcp响应向上级平台或sip服务器发送流数据
设计
创建socket、connect、初始化rtp启动数据接收线程
// TcpClient为封装的客户端socket类int CGBTcpClient::Start()
{if (0 ! m_localPort || m_tcpClient.get())return 0;int ret -1;do{m_tcpClient std::make_sharedTcpClient(nullptr, this);if (!m_tcpClient.get() || 0 ! m_tcpClient-TcpCreate())break;ret m_tcpClient-TcpConnectByTime(m_localIP.c_str(), m_localPort, 5);if (0 ! ret)break;ret InitRtp_();if (0 ! ret)break;m_thread std::thread(RTPPackerThread, this);return 0;} while (0);Stop();return ret;
}初始化rtp参数
int CGBTcpClient::InitRtp_()
{const int packSize 45678;RTPSessionParams sessionParams;sessionParams.SetProbationType(RTPSources::NoProbation);sessionParams.SetOwnTimestampUnit(90000.0 / 25.0);sessionParams.SetMaximumPacketSize(packSize 64);m_rtpTcpTransmitter new RTPTCPTransmitter(nullptr);m_rtpTcpTransmitter-Init(true);m_rtpTcpTransmitter-Create(65535, 0);if (0 ! Create(sessionParams, m_rtpTcpTransmitter))return -1;if (0 ! AddDestination(RTPTCPAddress(m_tcpClient-GetClientSocket())))return -1;return 0;
}视音频数据复用为PS发送数据同tcp passive发流
