example1.cpp

/* Here s a small IPv4 example: it asks for a portbase and a destination and starts sending pack

/*
   Here's a small IPv4 example: it asks for a portbase and a destination and 
   starts sending packets to that destination.
   这个IPv4版的例子：它要求portbase(本地端口)与destination （目的端口）然后发送消息
   同时还监听消息。
 
   例子测试一：
   启动一个运行实例，本地地址与目标地址用同一个端口8888
   例子测试二：
   启动两个运行实例，本地地址与目标地址用不同的端口（它要求是偶数端口号）
   两个实例互发
   例子的中文解释都由hanyuejun添加，有任何疑问请发[e-mail]
*/

#include "rtpsession.h"
#include "rtppacket.h"
#include "rtpudpv4transmitter.h"
#include "rtpipv4address.h"
#include "rtpsessionparams.h"
#include "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>

//
// 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;//portbase本地端口 destport目标端口
	uint32_t destip;//目标地址的ip地址
	std::string ipstr;
	int status,i,num;
	

        // First, we'll ask for the necessary information
	std::cout << "Example1" << std::endl;	
	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
	//转换
	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);
	//创建一个session
	status = sess.Create(sessparams,&transparams);	
	checkerror(status);
	//目标地址
	RTPIPv4Address addr(destip,destport);
	//添加地址
	status = sess.AddDestination(addr);
	checkerror(status);
	//char tmp[11] = {0};
		 
	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);
		//加锁
		sess.BeginDataAccess();
		
		// check incoming packets2
		if (sess.GotoFirstSourceWithData())
		{
			do
			{
				RTPPacket *pack;
				
				while ((pack = sess.GetNextPacket()) != NULL)
				{
					// You can examine the data here
					printf("Got packet !\n");
					std::cout << pack<<std::endl;
					std::cout << pack->GetPacketData()<<std::endl;
					std::cout << pack->GetPacketLength()<<std::endl;
					std::cout << pack->GetPayloadData()<<std::endl;
                    std::cout << pack->GetPayloadLength()<<std::endl;
					
					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));//释放资源最多等待十秒
	}
	
	sess.BYEDestroy(RTPTime(10,0),0,0);//释放占有的

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