rtp

dows 下资料
      http://www.cnblogs.com/skyseraph/archive/2012/04/07/2435540.html

一，安装Cmake
二，在 jrtplib-3.9.1_1 中运行 cmake . 生成Makefile
三，然后 make 
        接着 make install
        头文件被安装在 /usr/local/include/jrtplib3/ 所以编译程序时候需要添加 -I /usr/local/include/jrtplib3/
        库文件被安装在 /usr/local/lib/libjrtp.a 所以编译程序时候需要添加 -ljrtp
四，编译 example1
        g++ -o test example1.cpp -ljrtp -I /usr/local/include/jrtplib3/

       报错：./test: error while loading shared libraries: libjrtp.so.3.9.1: cannot open shared object file: No such file or directory
       分析：已经将 jrtp 安装完毕，为什么找不到动态库呢？
       解决：将 usr/local/lib/libjrtp.so.3.9.1 拷贝到 usr/lib 下面就可以执行了
五,调试
      报错:The specified port base is not an even number

      分析:jrtp 不支持奇数端口

附：

发送端代码：send.cpp

/*
   Here's a small IPv4 example: it asks for a portbase and a destination and
   starts sending packets to that destination.
*/

#include "jrtplib3/rtpsession.h"
#include "jrtplib3/rtpudpv4transmitter.h"
#include "jrtplib3/rtpipv4address.h"
#include "jrtplib3/rtpsessionparams.h"
#include "jrtplib3/rtperrors.h"
#ifndef WIN32
    #include <netinet/in.h>
    #include <arpa/inet.h>
#else
    #include <winsock2.h>
#endif // WIN32
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <string>

using namespace jrtplib;

void checkerror(int rtperr)
{
    if (rtperr < 0) //如果为负数 则返回失败信息
    {
        std::cout << "ERROR: " << RTPGetErrorString(rtperr) << std::endl;
        exit(-1);
    }
}

int main(void)
{
#ifdef WIN32
    WSADATA dat;
    WSAStartup(MAKEWORD(2,2),&dat);
#endif // WIN32

    RTPSession sess;

    uint16_t portbase=8000,destport=7800;
    uint32_t destip;
    std::string ipstr="127.0.0.1";
    int status,i,num=10;

    destip = inet_addr(ipstr.c_str());//IP地址的建立
    if (destip == INADDR_NONE)
    {
        std::cerr << "Bad IP address specified" << std::endl;
        return -1;
    }

    destip = ntohl(destip);


    RTPUDPv4TransmissionParams transparams;
    RTPSessionParams sessparams;

    sessparams.SetOwnTimestampUnit(1.0/10.0);

    sessparams.SetAcceptOwnPackets(true);
    transparams.SetPortbase(portbase);

    status = sess.Create(sessparams,&transparams);
    checkerror(status);//检查RTP会话创建过程是否失败

    RTPIPv4Address addr(destip,destport);//套接字

    status = sess.AddDestination(addr);//设置数据发送的目标地址(允许有多个目的地址)
    checkerror(status);

    for (i = 1 ; i <= num ; i++)
    {
        printf("
Sending packet %d/%d
",i,num);

        status = sess.SendPacket((void *)"1234567890",10,0,false,10);
        checkerror(status);


               // #ifndef RTP_SUPPORT_THREAD
         //     status = sess.Poll();
         //     checkerror(status);
              //  #endif // RTP_SUPPORT_THREAD

        RTPTime::Wait(RTPTime(1,0));
    }

    sess.BYEDestroy(RTPTime(10,0),0,0);

#ifdef WIN32
    WSACleanup();
#endif // WIN32
    return 0;
}

编译：g++ -o send send.cpp  -ljrtp -I /usr/local/include/jrtplib3/

接受端代码：

#include "jrtplib3/rtpsession.h"
#include "jrtplib3/rtpudpv4transmitter.h"
#include "jrtplib3/rtpipv4address.h"
#include "jrtplib3/rtpsessionparams.h"
#include "jrtplib3/rtperrors.h"

#ifndef WIN32
    #include <netinet/in.h>
    #include <arpa/inet.h>
#else
    #include <winsock2.h>
#endif // WIN32

#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <string>

using namespace jrtplib;

// 错误处理函数
void checkerror(int rtperr)
{
    if (rtperr < 0) //如果为负数 则返回失败信息
    {
        std::cout << "ERROR: " << RTPGetErrorString(rtperr) << std::endl;
        exit(-1);
    }
}


int main(int argc, char** argv)
{

  RTPSession sess;
  int localport;
  int portbase = 7800;
  int status;



  // 创建RTP会话
        RTPUDPv4TransmissionParams transparams;
    RTPSessionParams sessparams;

    sessparams.SetOwnTimestampUnit(1.0/10.0);

    sessparams.SetAcceptOwnPackets(true);
    transparams.SetPortbase(portbase);

    status = sess.Create(sessparams,&transparams);
        checkerror(status);


        uint32_t destip;
    std::string ipstr="127.0.0.1";
        int destport=7800;
    destip = inet_addr(ipstr.c_str());//IP地址的建立
    if (destip == INADDR_NONE)
    {
        std::cerr << "Bad IP address specified" << std::endl;
        return -1;
    }
    destip = ntohl(destip);
        RTPIPv4Address addr(destip,destport);//套接字

        sess.AddToAcceptList(addr);

        std::cout<<"Begin receive: 
";

        sess.BeginDataAccess();

        do{
                  status = sess.Poll();
                  checkerror(status);

        if (sess.GotoFirstSourceWithData())
        {
            do
            {
                RTPPacket *pack;

                while ((pack = sess.GetNextPacket()) != NULL)
                {
                    // You can examine the data here
                    printf("Got packet !
");

                    // we don't longer need the packet, so
                    // we'll delete it
                    sess.DeletePacket(pack);
                }
            } while (sess.GotoNextSourceWithData());
        }
        }
        while(1);
        sess.EndDataAccess();



  return 0;
}

编译：g++ -o receive  receive.cpp  -ljrtp -I /usr/local/include/jrtplib3/