一些介绍：
http://doserver.net/read.php?1028
http://doserver.net/read.php/1027.htm
http://doserver.net/read.php/1685.htm
现在开始对几个example分析一下，不过，就没有文档吗？
这里，详细的解释了几个例子：
http://hi.baidu.com/hanyuejun2006/blog/item/8a8ed939a9e344f53b87ce23.html
这里算一个：
http://xiyong8260.blog.163.com/blog/static/665146212008824112748499/
重要的是里面还讲了一些嵌入式方面的内容。
收和发的例子：
http://blog.chinaunix.net/u2/61880/showart_728528.html
比较详细的系列文章：http://www.cnitblog.com/tinnal/archive/2009/01/01/53342.html
PS:关于POLL的问题，发现只有调用者这个函数的时候，才会查询是否有包发过来，才会接收包。
If you're not using the poll thread, this function must be called regularly to process incoming data and to send RTCP data when necessary.
关于例程可以分为以下几个部分：
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（一）BASIC USAGE:
1）SET PARAMS
关于会话的参数
2）SET TRANSPARAMS
关于传输层的参数
3）CREATE SESSION
创建会话
4）SET PACKET ATTRIBUTES
包的属性设置
5）ADD DESTINATION
添加目的地址
6）PREPARE DATA
准备数据
7）SEND PACKET
发送包
8）DATAACCESS
数据处理（锁定操作，是指此时POLL线程不能改变正在处理的数据）
9）BYE
退出会话
example:
#include "rtpsession.h"
#include "rtppacket.h"
#include "rtpudpv4transmitter.h"
#include "rtpsessionparams.h"
#include "rtperrors.h"
#include "rtpipv4address.h"
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream>
#include <string>
void checkerror(int rtperr)
{
if(rtperr < 0)
{
std::cout<<"ERROR:"<<RTPGetErrorString(rtperr)<<std::endl;
exit(-1);
}
}
int main()
{
RTPSession sess;
uint16_t portbase;
int status;
//set params
RTPSessionParams sessparams;
sessparams.SetOwnTimestampUnit(1.0/10.0);
sessparams.SetAcceptOwnPackets(true);
//set transparams
RTPUDPv4TransmissionParams transparams;
transparams.SetPortbase(8000);
//create a session
status = sess.Create(sessparams, &transparams);
checkerror(status);
//set default packet attributes
sess.SetDefaultPayloadType(0);
sess.SetDefaultMark(false);
sess.SetDefaultTimestampIncrement(10);
//destination address
uint16_t destport;
uint32_t destip;
std::string ipstr;
std::cout<<"Enter the IP: "<<std::endl;
std::cin>>ipstr;
destip = inet_addr(ipstr.c_str());
if(destip == INADDR_NONE)
{
std::cerr<<"Bad IP"<<std::endl;
exit(-1);
}
destip = ntohl(destip);
//uint8_t localip[] = {192, 168, 0, 3};
RTPIPv4Address addr(destip, 8000);
//add destination
status = sess.AddDestination(addr);
checkerror(status);
//prepare payload data
uint8_t silencebuffer[160];
for(int i = 0; i < 160; i++)
{
silencebuffer[i] = 128;
}
//for time checking
RTPTime delay(0.020);
RTPTime starttime = RTPTime::CurrentTime();
bool done = false;
sess.Poll();
while(!done)
{
status = sess.SendPacket(silencebuffer, 160);
checkerror(status);
//receive data
sess.BeginDataAccess();
if(sess.GotoFirstSource())
{
do
{
RTPPacket *pack;
while((pack = sess.GetNextPacket()) != NULL)
{
std::cout<<"Got packet!"<<std::endl;
std::cout<<"sequence number: "<<pack->GetSequenceNumber()<<std::endl;
std::cout<<"Extended SN: "<<pack->GetExtendedSequenceNumber()<<std::endl;
std::cout<<"SSRC: "<<pack->GetSSRC()<<std::endl;
std::cout<<"Data: "<<pack->GetPayloadData()<<std::endl;
sess.DeletePacket(pack);
}
}while(sess.GotoNextSource());
}
sess.EndDataAccess();
RTPTime::Wait(delay);
RTPTime t = RTPTime::CurrentTime();
t -= starttime;
if(t > RTPTime(6, 0))
{
done = true;
}
}
delay = RTPTime(10.0);
sess.BYEDestroy(delay, "Time's up", 9);
return(0);
}
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