雷政富 2015-04-08 01:45 采纳率: 0%
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【愁的肝疼】jrtplib库不能接收组播数据

已经憋了1个多月了吧
使用jrtplib 无论如何都不能接收组播的数据
单播数据可首发 组播数据可发送

下载了最新版本的 jrtplib-3.9.1
在linux下也成功编译了example 示例运行也没啥问题
就是组播数据不能接收

我在example1.cpp里添加了 加入组播的代码 也还是不成功

/*
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
#include
#else
#include
#endif // WIN32
#include
#include
#include
#include

using namespace jrtplib;

//
// 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;

    // 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);

transparams.SetMulticastTTL(255);   

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

RTPIPv4Address addr(destip,destport);

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

//===============此处为添加的加入组播的程序==================

status = sess.SupportsMulticasting();
checkerror(status);

uint32_t m_ip;
uint16_t m_port;

m_ip = ntohl(inet_addr("224.1.2.1"));
m_port = 5100;
RTPIPv4Address m_addr(m_ip, m_port);
status = sess.JoinMulticastGroup(m_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");

                // 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;
}

实在憋得头大
诸位大神帮帮忙吧

另外,我用的是 超限组播测试工具
在linux下用tcpdump命令也抓到组播的数据包了
就是程序里说啥也收不到……

  • 写回答

2条回答 默认 最新

  • oyljerry 2015-04-08 15:13
    关注

    抓包看你的组播地址端口是否收到数据包。

    评论

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