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</pre>文章里面主要是把发送端课接收端代码的实现提了出来，和重要函数里的源码贴出来辅助学习，看到网上有人说好久做不出来，建议看看对应加入组播的源码，注意细节，话不多说，代码直接贴出来，各位朋友有意见多多交流。<p></p><p>发送端：</p><pre code_snippet_id="1677192" snippet_file_name="blog_20160510_2_5720022" name="code" class="cpp">#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>
#include<windows.h>
#endif // WIN32
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <string>
using namespace jrtplib;
using namespace std;
void checkerror(int rtperr)
{
if(rtperr<0)
{
cout<<"ERROR:"<<RTPGetErrorString(rtperr)<<endl;
exit(-1);
}
}
int main()
{
#ifdef WIN32
WSADATA dat;
WSAStartup(MAKEWORD(2,2),&dat);
#endif // WIN32
list<uint32_t> localip;
RTPSession sess;
uint16_t portbase=6666,destport=8888;
uint32_t destip,srcip;
string ipstr="239.255.0.1";
string ipsrc="114.212.118.99";
int status,i,num;
destip=inet_addr(ipstr.c_str());//将字符串转换为32位网络字节序。
srcip=inet_addr(ipsrc.c_str());
if(destip==INADDR_NONE)
{
cout<<"bad destip address"<<endl;
exit(-1);
}
destip=ntohl(destip);//将32位网络字节序转换成主机字节序
srcip=ntohl(srcip);
localip.push_back(srcip);
//设置传输参数和会话参数
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(1.0/8000);
sessparams.SetAcceptOwnPackets(true);
transparams.SetPortbase(portbase);
transparams.SetLocalIPList(localip);
transparams.SetMulticastInterfaceIP(srcip);
transparams.SetMulticastTTL(255);
status = sess.Create(sessparams,&transparams);
checkerror(status);
RTPIPv4Address addr(destip,destport);
status=sess.AddDestination(addr);
checkerror(status);
if(sess.SupportsMulticasting())
{
cout<<"支持组播"<<endl;
}
char *p=new char[100];
i=0;
sess.SetDefaultPayloadType(96);
sess.SetDefaultMark(false);
sess.SetDefaultTimestampIncrement(160);
while(1)
{
i++;
memset(p,0,100);
sprintf(p,"bababba:%d",i);
status=sess.SendPacket(p,100);
cout<<i<<endl;;
}
sess.BYEDestroy(RTPTime(10,0),0,0);
return 0;
}
</pre><pre code_snippet_id="1677192" snippet_file_name="blog_20160510_4_7431889" name="code" class="cpp">接收端：
<pre name="code" class="cpp">
#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>
#include<windows.h>
#endif // WIN32
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <string>
using namespace jrtplib;
using namespace std;
void checkerror(int rtperr)
{
if(rtperr<0)
{
cout<<"ERROR:"<<RTPGetErrorString(rtperr)<<endl;
exit(-1);
}
}
int main()
{
#ifdef WIN32
WSADATA dat;
WSAStartup(MAKEWORD(2,2),&dat);
#endif // WIN32
RTPUDPv4TransmissionParams transparams;
RTPSessionParams sessparams;
list<uint32_t> localip;
RTPSession sess;
uint16_t portbase=8888;
uint32_t destip,srcip;
string ipstr="239.255.0.1";
string ipsrc="114.212.114.200";
int status,i,num;
destip=inet_addr(ipstr.c_str());//将字符串转换为32位网络字节序。
srcip=inet_addr(ipsrc.c_str());
destip=ntohl(destip);//将32位网络字节序转换成主机字节序
srcip=ntohl(srcip);
localip.push_back(srcip);
sessparams.SetOwnTimestampUnit(1.0/8000);
sessparams.SetAcceptOwnPackets(true);
transparams.SetPortbase(portbase);
//transparams.SetLocalIPList(localip);
transparams.SetBindIP(srcip);
transparams.SetMulticastInterfaceIP(srcip);
RTPIPv4Address addr(destip,portbase);
status = sess.Create(sessparams,&transparams);
checkerror(status);
status=sess.SupportsMulticasting();
checkerror(status);
status=sess.JoinMulticastGroup(addr);
checkerror(status);
//sess.SetDefaultPayloadType(96);
//sess.SetDefaultMark(false);
//sess.SetDefaultTimestampIncrement(160);
while(1)
{
sess.BeginDataAccess();
if(sess.GotoFirstSourceWithData())
{
do
{
RTPPacket *pack;
uint32_t packetLen;
uint8_t *packetData;
uint8_t j = 11;
while ((pack = sess.GetNextPacket()) != NULL)
{
packetLen = pack->GetPacketLength() - 1;
packetData = pack->GetPacketData();
printf("RECV data: ");
while(j++ < packetLen)
{
printf("%c", *(packetData + j));
}
printf("\n");
sess.DeletePacket(pack);
}
}while(sess.GotoNextSourceWithData());
}
sess.EndDataAccess();
}
return 0;
}
重要的源码
int RTPUDPv4Transmitter::JoinMulticastGroup(const RTPAddress &addr)
{
if (!init)
return ERR_RTP_UDPV4TRANS_NOTINIT;
MAINMUTEX_LOCK
int status;
if (!created)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTCREATED;
}
if (addr.GetAddressType() != RTPAddress::IPv4Address)
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_INVALIDADDRESSTYPE;
}
const RTPIPv4Address &address = (const RTPIPv4Address &)addr;
uint32_t mcastIP = address.GetIP();
if (!RTPUDPV4TRANS_IS_MCASTADDR(mcastIP))
{
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_NOTAMULTICASTADDRESS;
}
status = multicastgroups.AddElement(mcastIP);
if (status >= 0)
{
RTPUDPV4TRANS_MCASTMEMBERSHIP(rtpsock,IP_ADD_MEMBERSHIP,mcastIP,status);
if (status != 0)
{
multicastgroups.DeleteElement(mcastIP);
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_COULDNTJOINMULTICASTGROUP;
}
RTPUDPV4TRANS_MCASTMEMBERSHIP(rtcpsock,IP_ADD_MEMBERSHIP,mcastIP,status);
if (status != 0)
{
RTPUDPV4TRANS_MCASTMEMBERSHIP(rtpsock,IP_DROP_MEMBERSHIP,mcastIP,status);
multicastgroups.DeleteElement(mcastIP);
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_COULDNTJOINMULTICASTGROUP;
}
}
MAINMUTEX_UNLOCK
return status;
}
#define RTPUDPV4TRANS_MCASTMEMBERSHIP(socket,type,mcastip,status) { struct ip_mreq mreq; mreq.imr_multiaddr.s_addr = htonl(mcastip); mreq.imr_interface.s_addr = htonl(mcastifaceIP); status = setsockopt(socket,IPPROTO_IP,type,(const char *)&mreq, sizeof(struct ip_mreq)); }
里面的mcastifaceIP是由自己提前设定的
在create函数里面
bindIP = params->GetBindIP();
mcastifaceIP = params->GetMulticastInterfaceIP();
memset(&addr,0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(params->GetPortbase());
addr.sin_addr.s_addr = htonl(bindIP);
if (bind(rtpsock,(struct sockaddr *)&addr,sizeof( struct sockaddr_in)) != 0)
{
RTPCLOSE(rtpsock);
RTPCLOSE(rtcpsock);
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_CANTBINDRTPSOCKET;
}
memset(&addr,0, sizeof(struct sockaddr_in));
addr.sin_family = AF_INET;
addr.sin_port = htons(params->GetPortbase()+1);
addr.sin_addr.s_addr = htonl(bindIP);
if (bind(rtcpsock,(struct sockaddr *)&addr,sizeof( struct sockaddr_in)) != 0)
{
RTPCLOSE(rtpsock);
RTPCLOSE(rtcpsock);
MAINMUTEX_UNLOCK
return ERR_RTP_UDPV4TRANS_CANTBINDRTCPSOCKET;
}
具体的实现好的代码下载地址，希望对各位有用，在vs2012下运行：
http://download.csdn.net/detail/u010289908/9515174
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原文地址：http://blog.csdn.net/u010289908/article/details/51360984
