jrtplib的简单封装类及使用（一）

最新推荐文章于 2021-03-16 18:51:13 发布

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本文介绍了一个基于jrtplib库的RTP发送与接收类的简单封装，可用于视频帧数据的网络传输。该封装包括了发送端RtpSender和接收端RtpReceiver两个主要类，涉及网络地址解析、会话创建、数据包发送与接收等功能。

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使用到了一个辅助类IpPort

#ifndef _IPPORT_H #define _IPPORT_H #include <WinSock2.h> class IpPort { public: unsigned int m_ip;//网络字节顺序 unsigned short m_port; public: IpPort() { m_ip = INADDR_NONE; m_port = INVALID_SOCKET; } ~IpPort(){} char* GetIp(char *ip) { if (!ip) return NULL; struct in_addr *paddr; paddr->S_un.S_addr = (unsigned long)m_ip; memcpy(ip,inet_ntoa(*paddr),16); return ip; } void SetIp(unsigned int ip){m_ip=ip;} void SetIp(char *strip) { SetIp(inet_addr((const char*)strip)); } void SetPort(unsigned int port){m_port=port;} }; #endif

发送端的封装类RtpSender.h

#ifndef _RTPSENDER_H #define _RTPSENDER_H #include <rtpsession.h> #include <vector> #include "IpPort.h" #define LOCAL_SENDER_PORT 15000 #ifndef MAX_PACKET_SIZE #define MAX_PACKET_SIZE 15000//最大包大小 #endif #ifndef FRAME_RATE #define FRAME_RATE 25//帧率 #endif class RtpSender { public: RtpSender(); ~RtpSender(); bool CreateSenderSession(UINT16 port = LOCAL_SENDER_PORT); bool AddDestAddr(IpPort ipport); bool SendPacket(void *data,unsigned int len); void CloseSenderSession(); private: RTPSession m_session; public: IpPort m_localIpPort; char m_localName[300]; std::vector<IpPort> m_v_destIpPort; }; #endif//_RTPSENDER_H

RtpSender.cpp

#include "stdafx.h" #include "RtpSender.h" #include <rtpipv4address.h> #include <rtpsessionparams.h> #include <rtpudpv4transmitter.h> #ifdef _DEBUG #include <string.h> #endif // _DEBUG RtpSender::RtpSender() { // WSADATA dat; // WSAStartup(MAKEWORD(2,2),&dat); m_localIpPort.SetPort(LOCAL_SENDER_PORT); m_localIpPort.SetIp(INADDR_NONE); memset(m_localName,0,300); if (gethostname(m_localName,300) == 0) { PHOSTENT phostinfo; if ((phostinfo = gethostbyname(m_localName)) != NULL) { struct in_addr *paddr; paddr = (struct in_addr*)(*(phostinfo->h_addr_list)); m_localIpPort.SetIp((UINT32)(paddr->S_un.S_addr)); } } } RtpSender::~RtpSender() { /* WSACleanup();*/ m_v_destIpPort.clear(); } bool RtpSender::CreateSenderSession(UINT16 port /* = LOCAL_SENDER_PORT */) { m_localIpPort.SetPort(port); RTPSessionParams sessParams; RTPUDPv4TransmissionParams transParams; sessParams.SetMaximumPacketSize(MAX_PACKET_SIZE); sessParams.SetOwnTimestampUnit(1.0/FRAME_RATE); sessParams.SetAcceptOwnPackets(true); transParams.SetPortbase(m_localIpPort.m_port); int status = m_session.Create(sessParams, &transParams); if (status < 0) { #ifdef _DEBUG static bool RtpSender_CreateSenderSession = false; std::string str = RTPGetErrorString(status); if (RtpSender_CreateSenderSession) { ::MessageBox(NULL,/*str.c_str()*/"RtpSender::CreateSender失败!","Error",MB_OK | MB_ICONEXCLAMATION); } #endif // _DEBUG return false; } return true; } bool RtpSender::AddDestAddr(IpPort ipport) { RTPIPv4Address addr(ntohl(ipport.m_ip)/*转为主机字节顺序*/,ipport.m_port); int status; status = m_session.AddDestination(addr); if (status < 0) { #ifdef _DEBUG static bool RTPSender_AddDestAddr = true; std::string str = RTPGetErrorString(status); if (RTPSender_AddDestAddr) { ::MessageBox(NULL,/*str.c_str()*/"RTPSender::AddDestAddr失败!","Error",MB_OK | MB_ICONEXCLAMATION); RTPSender_AddDestAddr = false; } #endif // _DEBUG return false; } m_v_destIpPort.push_back(ipport); return true; } bool RtpSender::SendPacket(void *data,unsigned int len) { int status; status = m_session.SendPacket(/*(const void*)*/data,len,0,false,40); if (status < 0) { #ifdef _DEBUG static bool RtpSender_SendPacket = true; std::string str = RTPGetErrorString(status); if (RtpSender_SendPacket) { ::MessageBox(NULL,/*str.c_str()*/"RTPSender::SendPacket失败!","Error",MB_OK | MB_ICONEXCLAMATION); RtpSender_SendPacket = false; } #endif // _DEBUG return false; } return true; } void RtpSender::CloseSenderSession() { RTPTime::Wait(RTPTime(10,0)); m_session.BYEDestroy(RTPTime(10,0),0,0); }

接收端的封装类 RtpReceiver.h

#ifndef _RTPRECEIVER_H #define _RTPRECEIVER_H #include <rtpsession.h> #include <vector> #include "IpPort.h" #define LOCAL_RECEIVER_PORT 20000 #ifndef MAX_PACKET_SIZE #define MAX_PACKET_SIZE 15000//最大包大小 #endif #ifndef FRAME_RATE #define FRAME_RATE 25//帧率 #endif class RtpReceiver; class RTPSession_Po : public RTPSession { public: RTPSession_Po(){pRtpReceiver=NULL;} void SetRtpReceiver(RtpReceiver* prtp) { pRtpReceiver = prtp; } protected: void OnPollThreadStep(); private: RtpReceiver *pRtpReceiver; }; class RtpReceiver { public: RtpReceiver(); ~RtpReceiver(); bool CreateReceiverSession(UINT16 port = LOCAL_RECEIVER_PORT); bool AddSourceAddr(IpPort ipport); void CloseReceiverSession(); public: virtual void ProcessReceiveData(RTPSourceData &srcdata, RTPPacket &packet) = 0; private: RTPSession_Po m_session; public: std::vector<IpPort> m_v_sourIpPort; IpPort m_localIpPort; char m_localName[300]; }; #endif//_RTPRECEIVER_H

RtpReceiver.cpp

#include "stdafx.h" #include "RtpReceiver.h" #include <rtpipv4address.h> #include <rtpsessionparams.h> #include <rtpudpv4transmitter.h> #ifdef _DEBUG #include <string.h> #endif // _DEBUG void RTPSession_Po::OnPollThreadStep() { BeginDataAccess(); if (GotoFirstSourceWithData()) { do { RTPPacket *ppacket; RTPSourceData *psrcdat; psrcdat = GetCurrentSourceInfo(); while (ppacket = GetNextPacket()) { pRtpReceiver->ProcessReceiveData(*psrcdat,*ppacket); DeletePacket(ppacket); } } while (GotoNextSourceWithData()); } EndDataAccess(); } RtpReceiver::RtpReceiver() { // WSADATA dat; // WSAStartup(MAKEWORD(2,2),&dat); m_localIpPort.SetPort(LOCAL_RECEIVER_PORT); m_localIpPort.SetIp(INADDR_NONE); m_session.SetRtpReceiver(this); memset(m_localName,0,300); if (gethostname(m_localName,300) == 0) { PHOSTENT phostinfo; if ((phostinfo = gethostbyname(m_localName)) != NULL) { struct in_addr *paddr; paddr = (struct in_addr*)(*(phostinfo->h_addr_list)); m_localIpPort.SetIp((UINT32)(paddr->S_un.S_addr)); } } } RtpReceiver::~RtpReceiver() { /* WSACleanup();*/ m_v_sourIpPort.clear(); } bool RtpReceiver::CreateReceiverSession(UINT16 port /* = LOCAL_RECEIVER_PORT */) { m_localIpPort.SetPort(port); RTPSessionParams sessParams; RTPUDPv4TransmissionParams transParams; sessParams.SetMaximumPacketSize(MAX_PACKET_SIZE); sessParams.SetOwnTimestampUnit(1.0/FRAME_RATE); sessParams.SetAcceptOwnPackets(true); transParams.SetPortbase(m_localIpPort.m_port); int status = m_session.Create(sessParams, &transParams); if (status < 0) { #ifdef _DEBUG static bool RtpReceiver_CreateReceiverSession = true; std::string str = RTPGetErrorString(status); if (RtpReceiver_CreateReceiverSession) { ::MessageBox(NULL,/*str.c_str()*/"RtpReceiver::CreateReceiverSession()失败!","Error",MB_OK | MB_ICONEXCLAMATION); RtpReceiver_CreateReceiverSession = false; } #endif // _DEBUG return false; } return true; } bool RtpReceiver::AddSourceAddr(IpPort ipport) { RTPIPv4Address addr(ntohl(ipport.m_ip)/*主机字节顺序*/,ipport.m_port); int status; status = m_session.AddDestination(addr); if (status < 0) { #ifdef _DEBUG static bool RtpReceiver_AddSourceAddr = true; std::string str = RTPGetErrorString(status); if (RtpReceiver_AddSourceAddr) { ::MessageBox(NULL,/*str.c_str()*/"RtpReceiver::AddSourceAddr()失败!","Error",MB_OK | MB_ICONEXCLAMATION); RtpReceiver_AddSourceAddr = false; } #endif // _DEBUG return false; } m_v_sourIpPort.push_back(ipport); return true; } void RtpReceiver::CloseReceiverSession() { RTPTime::Wait(RTPTime(10,0)); m_session.BYEDestroy(RTPTime(10,0),0,0); }

以上只是简单的封装了jrtplib开源库里的代码，可以用于发送视频帧数据。使用方法后面再说。