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一. 前言

        JRTPLIB 是 C++ 语言编写的 RTP 库，它帮助我们封装了 RTP 协议细节，用户通过提供好的接口可以设置 RTP 包信息并发送到指定地址，也可以接收 RTP 包取出信息。

        本文仅介绍如何使用 JRTPLIB 发送/接收 RTP 数据包，我在这篇博客又介绍了如何使用 JRTPLIB 构造 RTP 数据包来荷载 H264 码流数据。

二. 下载编译安装

git clone https://github.com/j0r1/JRTPLIB.git
cd JRTPLIB
cmake CMakeLists.txt
make
sudo make install

三. 代码实战

1. JRTPLIB接收RTP包程序

#include <jrtplib3/rtpsession.h>
#include <jrtplib3/rtplibraryversion.h>
#include <jrtplib3/rtpudpv4transmitter.h>
#include <jrtplib3/rtpsessionparams.h>
#include <jrtplib3/rtppacket.h>
#include <iostream>
#include <arpa/inet.h>
 
using namespace jrtplib;
 
void checkerror(int rtperr) {
	if (rtperr < 0) {
		std::cout << "ERROR: " << RTPGetErrorString(rtperr) << std::endl;
		exit(-1);
	}
}
 
int main() {
 
    std::cout << "Using JRTPLib version: " << RTPLibraryVersion::GetVersion().GetVersionString() << std::endl;
 
    uint16_t localport;
    std::cout << "Enter local port(even): ";
	std::cin >> localport;
 
    RTPUDPv4TransmissionParams tranparams;
    tranparams.SetPortbase(localport);
 
    RTPSessionParams sessparams;
    sessparams.SetOwnTimestampUnit(1.0 / 10.0);
    sessparams.SetAcceptOwnPackets(true);
 
    RTPSession sess;
    int status = sess.Create(sessparams, &tranparams);
    checkerror(status);
 
    
    RTPTime delay(0.020);
    RTPTime startTime = RTPTime::CurrentTime();
 
    bool done = false;
 
    while (!done) {
        sess.BeginDataAccess();
        if (sess.GotoFirstSourceWithData()) {
            do {
                RTPPacket* packet;
                while ((packet = sess.GetNextPacket()) != NULL) {
                    std::cout << "Got packet!" << std::endl;
                    std::cout << "SSRC: " << packet->GetSSRC() << std::endl;
                    std::cout << "Payload data: " << packet->GetPayloadData() << std::endl;
                    std::cout << "Payload type: " << packet->GetPayloadType() << std::endl;
                    std::cout << "Packet length: " <<packet->GetPacketLength() << std::endl;
                    std::cout << "Sequence number: " << packet->GetSequenceNumber() << std::endl;
                    std::cout << "Timestamp: " << packet->GetTimestamp() << std::endl;
                    std::cout << std::endl;
                    sess.DeletePacket(packet);
                } 
            } while (sess.GotoNextSourceWithData());
        }
        sess.EndDataAccess();
 
        RTPTime::Wait(delay);
    }
 
    sess.EndDataAccess();
 
    return 0;
}

编译后运行如上，设置本地监听端口后就会开始等待 RTP 数据。

2. JRTPLIB发送RTP包程序

#include <jrtplib3/rtpsession.h>
#include <jrtplib3/rtplibraryversion.h>
#include <jrtplib3/rtpudpv4transmitter.h>
#include <jrtplib3/rtpsessionparams.h>
#include <jrtplib3/rtppacket.h>
#include <iostream>
#include <arpa/inet.h>
 
using namespace jrtplib;
 
void checkerror(int rtperr) {
	if (rtperr < 0) {
		std::cout << "ERROR: " << RTPGetErrorString(rtperr) << std::endl;
		exit(-1);
	}
}
 
int main() {
    std::cout << "Using JRTPLib version: " << RTPLibraryVersion::GetVersion().GetVersionString() << std::endl;
	
    uint16_t localport;
    std::cout << "Enter local port(even): ";
	std::cin >> localport;
 
    std::string ipstr;
	std::cout << "Enter the destination IP address: ";
	std::cin >> ipstr;
	uint32_t destip = inet_addr(ipstr.c_str());
	if (destip == INADDR_NONE) {
		std::cerr << "Bad IP address specified" << std::endl;
		return -1;
	}
	
	// The inet_addr function returns a value in network byte order, but
	// we need the IP address in host byte order, so we use a call to
	// ntohl
	destip = ntohl(destip);
 
    uint16_t destport;
	std::cout << "Enter the destination port: ";
	std::cin >> destport;
 
    int num;
	std::cout << "Number of packets you wish to be sent: ";
	std::cin >> num;
 
    RTPUDPv4TransmissionParams tranparams;
    tranparams.SetPortbase(localport);
 
    RTPSessionParams sessparams;
    sessparams.SetOwnTimestampUnit(1.0 / 10.0);
    sessparams.SetAcceptOwnPackets(true);
 
    // Now, we'll create a RTP session, set the destination, send some
	// packets and poll for incoming data.
    RTPSession sess;
    int status = sess.Create(sessparams, &tranparams);
    checkerror(status);
 
    RTPIPv4Address destAddr(destip, destport);
    status = sess.AddDestination(destAddr);
	checkerror(status);
 
    sess.SetDefaultPayloadType(96);
    sess.SetDefaultMark(false);
 
    for (int i = 1;i <= num;++i) {
        std::cout << "Sending packet " << i << "/" << num << std::endl;
 
        status = sess.SendPacket((void*)"0123456789", 10, 0, false, 10);
        checkerror(status);
 
        RTPTime::Wait(RTPTime(1, 0));
    }
 
    sess.BYEDestroy(RTPTime(10, 0), 0, 0);
 
    return 0;
}

        编译后运行如上，输入本地 UDP 使用的端口以及对端监听的端口，设置需要发送的 RTP 包数即可发送，发送后接收端打印的信息如下。