编译jrtplib和jthread

 最近要做网络监控视频的传输，以前就接触过图像处理的基本东西，对于网络稍微了解一点，对于视频的编解码则是一窍不通。这两周查阅了不少资料，发现一般使

用的网路协议都是RTP/RTCP，网络上找了不少资料，本来想整个现成的例子看看，下了不少发现都不满意，只好自己找到那个很牛的老外Jori写的开源的RTP库jrtplib研究一下自己编译一下，学学了。

首先从他的个人网站上http://research.edm.uhasselt.be/~jori/page/index.php?n=CS.Jrtplib下载最新的jrtplib-3.9.0，以及最新的jthread-1.3.0（他的页面上也有下载），解压完之后，看了看ReadMe发现需要Cmake编译，oh！mygod！慢慢来吧。

使用Cmake_gui 2.8版本，首先编译生成jthread.lib。

添加完路径之后，很顺利的就可以得到vs2005下的工程文件，编译之后可以在C:/Program Files/jthread/include（默认的路径）下看到jthread的头文件以及在C:/Program Files/jthread/lib下的lib文件（一般吧debug和release都编译一下）。

然后就是jrtplib的编译了。

jrtplib的cmake编译需要jthread.lib（jthread_d.lib）编译，cmake不会用，开始时出现错误，后来自己摸索着试了试，成功了，就是在编译几个example时发现有warning，也没什么关系。设置如图所示

这样再generate就可以了（不知道以后有没有问题，反正现在没问题）。

然后就是vs2005中的生成lib库了。

首先需要将所有jrtplib中src下的头文件中包含jmutex.h和jthread.h的include全部修改为include "jmutex."和include"jthread.h"，然后进行下一步

打开工程文件编译之后安装，可以在C:\Program Files\jrtplib下面看到两个文件夹include和lib分别放着头文件和库文件。

打开example1，进行相应的设置之后run，发现可以运行了！

这样应该就可以在工程中使用jrtplib库了---------还没有试，期待ing。。。。。

另：在Jori的主页上有关于这两个库jrtplib和jthread的使用手册的pdf下载可以参考。

NOTE：开始时没有将jthread和jmutex的include修改，虽然编译成功了，运行example也可以但是自己编的程序就出问题，后来参考了一下http://blog.csdn.net/aaronalan/article/details/5153604 重新编译的才行了。

附上一个在网上找到的例子：

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

#include "rtpsession.h"
#include "rtpudpv4transmitter.h"
#include "rtpipv4address.h"
#include "rtpsessionparams.h"
#include "rtperrors.h"
#include "rtppacket.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;
#pragma comment(lib,"jrtplib_d.lib")
#pragma comment(lib,"jthread_d.lib")
#pragma comment(lib,"ws2_32.lib")
//
// This function checks if there was a RTP error. If so, it displays an error
// message and exists.
//

void checkerror(int rtperr)
{
    if (rtperr < 0)
    {
        std::cout << "ERROR: " << RTPGetErrorString(rtperr) << std::endl;
        exit(-1);
    }
}

//
// The main routine
//

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

    RTPSession sess;
    uint16_t portbase,destport;
    uint32_t destip;
    std::string ipstr;
    int status,i,num;
    BYTE *pBuffer;
    BYTE *pfBuffer;
        // First, we'll ask for the necessary information

    std::cout << "Enter local portbase:" << std::endl;
    std::cin >> portbase;
    std::cout << std::endl;

    std::cout << "Enter the destination IP address" << std::endl;
    std::cin >> ipstr;
    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);

    std::cout << "Enter the destination port" << std::endl;
    std::cin >> destport;

    std::cout << std::endl;
    std::cout << "Number of packets you wish to be sent:" << std::endl;
    std::cin >> num;

    // Now, we'll create a RTP session, set the destination, send some
    // packets and poll for incoming data.

    RTPUDPv4TransmissionParams transparams;
    RTPSessionParams sessparams;

    // IMPORTANT: The local timestamp unit MUST be set, otherwise
    //            RTCP Sender Report info will be calculated wrong
    // In this case, we'll be sending 10 samples each second, so we'll
    // put the timestamp unit to (1.0/10.0)
    sessparams.SetOwnTimestampUnit(1.0/10.0);

    sessparams.SetAcceptOwnPackets(true);
    transparams.SetPortbase(portbase);
    status = sess.Create(sessparams,&transparams);
    checkerror(status);

    RTPIPv4Address addr(destip,destport);

    status = sess.AddDestination(addr);
    checkerror(status);

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

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

        sess.BeginDataAccess();

        // check incoming packets
        if (sess.GotoFirstSourceWithData())
        {
            do
            {
                RTPPacket *pack;
                while ((pack = sess.GetNextPacket()) != NULL)
                {
                    // You can examine the data here
                    printf("Got packet !\n");

                    std::cout << "Got packet with "
                        << "extended sequence number "
                        << pack->GetExtendedSequenceNumber()
                        << " from SSRC " << pack->GetSSRC()
                        << std::endl;

                    int dataLength = pack->GetPayloadLength();
                    pfBuffer =(unsigned char*)pack->GetPayloadData();
                    pBuffer = new BYTE[dataLength + 1];
                    memcpy(pBuffer, pfBuffer, dataLength);
                    pBuffer[dataLength] = 0;
                    std::cout << pBuffer << std::endl;
                    delete []pBuffer;
                    pBuffer = NULL;
                    // we don't longer need the packet, so
                    // we'll delete it
                    sess.DeletePacket(pack);
                }
            } while (sess.GotoNextSourceWithData());
        }

        sess.EndDataAccess();

#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;
}

/* Here's a small IPv4 example: it asks for a portbase and a destination and starts sending packets to that destination. */ #include "rtpsession.h" #include "rtpudpv4transmitter.h" #include "rtpipv4address.h" #include "rtpsessionparams.h" #include "rtperrors.h" #include "rtppacket.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; #pragma comment(lib,"jrtplib_d.lib") #pragma comment(lib,"jthread_d.lib") #pragma comment(lib,"ws2_32.lib") // // This function checks if there was a RTP error. If so, it displays an error // message and exists. // void checkerror(int rtperr) { if (rtperr < 0) { std::cout << "ERROR: " << RTPGetErrorString(rtperr) << std::endl; exit(-1); } } // // The main routine // int main(void) { #ifdef WIN32 WSADATA dat; WSAStartup(MAKEWORD(2,2),&dat); #endif // WIN32 RTPSession sess; uint16_t portbase,destport; uint32_t destip; std::string ipstr; int status,i,num; BYTE *pBuffer; BYTE *pfBuffer; // First, we'll ask for the necessary information std::cout << "Enter local portbase:" << std::endl; std::cin >> portbase; std::cout << std::endl; std::cout << "Enter the destination IP address" << std::endl; std::cin >> ipstr; 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); std::cout << "Enter the destination port" << std::endl; std::cin >> destport; std::cout << std::endl; std::cout << "Number of packets you wish to be sent:" << std::endl; std::cin >> num; // Now, we'll create a RTP session, set the destination, send some // packets and poll for incoming data. RTPUDPv4TransmissionParams transparams; RTPSessionParams sessparams; // IMPORTANT: The local timestamp unit MUST be set, otherwise // RTCP Sender Report info will be calculated wrong // In this case, we'll be sending 10 samples each second, so we'll // put the timestamp unit to (1.0/10.0) sessparams.SetOwnTimestampUnit(1.0/10.0); sessparams.SetAcceptOwnPackets(true); transparams.SetPortbase(portbase); status = sess.Create(sessparams,&transparams); checkerror(status); RTPIPv4Address addr(destip,destport); status = sess.AddDestination(addr); checkerror(status); for (i = 1 ; i <= num ; i++) { printf("\nSending packet %d/%d\n",i,num); // send the packet status = sess.SendPacket((void *)"1234567890",10,0,false,10); checkerror(status); sess.BeginDataAccess(); // check incoming packets if (sess.GotoFirstSourceWithData()) { do { RTPPacket *pack; while ((pack = sess.GetNextPacket()) != NULL) { // You can examine the data here printf("Got packet !\n"); std::cout << "Got packet with " << "extended sequence number " << pack->GetExtendedSequenceNumber() << " from SSRC " << pack->GetSSRC() << std::endl; int dataLength = pack->GetPayloadLength(); pfBuffer =(unsigned char*)pack->GetPayloadData(); pBuffer = new BYTE[dataLength + 1]; memcpy(pBuffer, pfBuffer, dataLength); pBuffer[dataLength] = 0; std::cout << pBuffer << std::endl; delete []pBuffer; pBuffer = NULL; // we don't longer need the packet, so // we'll delete it sess.DeletePacket(pack); } } while (sess.GotoNextSourceWithData()); } sess.EndDataAccess(); #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; }