jrtplib3.9.1 example4

  
  
  
  
例子1发送数据,本例接收数据,执行结果:
/*
This IPv4 example uses the background thread itself to process all packets.
You can use example one to send data to the session that's created in this
example.
本IPv4示例仅仅使用后台线程来处理所有的数据包。
你可以从示例1来发送数据到本示例创建的会话中。
*/

#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 "rtpsourcedata.h"
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <string>

using namespace jrtplib ;

#ifdef RTP_SUPPORT_THREAD

//
// This function checks if there was a RTP error. If so, it displays an error
// message and exists.
//本函数检查是否有RTP错误。如果有,本函数显示错误信息,然后退出。

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

//
// The new class routine
//一个新的继承自RTPSession的类

class MyRTPSession : public RTPSession
{
protected:
//轮询线程每次启动时被调用。每当检测到有传入的数据到达时, 或者当要发送一个RTCP复合数据包时,这便会发生。
void OnPollThreadStep ();
//对接收到的数据包进行处理
void ProcessRTPPacket ( const RTPSourceData & srcdat , const RTPPacket & rtppack );
};

void MyRTPSession :: OnPollThreadStep ()
{
BeginDataAccess ();

// check incoming packets
//检查发送进来的数据包
if ( GotoFirstSourceWithData ())
{
do
{
RTPPacket * pack ;
RTPSourceData * srcdat ;

srcdat = GetCurrentSourceInfo ();

while (( pack = GetNextPacket ()) != NULL )
{
//此处对接收到的数据包进行具体的处理
ProcessRTPPacket ( * srcdat , * pack );
DeletePacket ( pack );
}
} while ( GotoNextSourceWithData ());
}

EndDataAccess ();
}

//对接收到的数据包进行处理
void MyRTPSession :: ProcessRTPPacket ( const RTPSourceData & srcdat , const RTPPacket & rtppack )
{
// You can inspect the packet and the source's info here
// 你可以在此处检查数据包,以及该数据源的信息
std :: cout << "Got packet " << rtppack . GetExtendedSequenceNumber () << " from SSRC " << srcdat . GetSSRC () << std :: endl ;
}

//
// The main routine
// 主函数

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

MyRTPSession sess ;
uint16_t portbase ;
std :: string ipstr ;
int status , num ;

         // First, we'll ask for the necessary information
// 首先,让用户输入一些必要的信息
std :: cout << "Enter local portbase:" << std :: endl ;
std :: cin >> portbase ;
std :: cout << std :: endl ;

std :: cout << std :: endl ;
std :: cout << "Number of seconds you wish to wait:" << std :: endl ;
std :: cin >> num ;

// Now, we'll create a RTP session, set the destination
// and poll for incoming data.
//现在,我们将创建一个RTP会话,设置目的端点,然后轮询等待发进来的数据

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 just use 8000 samples per second.
// 重要信息:本地的时间戳单位必须要设置,否则RTCP发送报告信息将会计算错误
// 在本例,我们就用每秒8000个样本
sessparams . SetOwnTimestampUnit ( 1.0 / 8000.0 );

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

// Wait a number of seconds
// 等待几秒钟
RTPTime :: Wait ( RTPTime ( num , 0 ));

sess . BYEDestroy ( RTPTime ( 10 , 0 ), 0 , 0 );

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

#else

int main ( void )
{
std :: cerr << "Thread support is required for this example" << std :: endl ;//本例需要线程支持
return 0 ;
}

#endif // RTP_SUPPORT_THREAD

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