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【www.gdgbn.com--面向对象编程】
资源下载：http://download.111cn.net/source/444512
实时流协议RTSP(RealTimeStreamingProtocol)是由RealNetworks和 Netscape共同提出的，该协议定义了一对多应用程序如何有效地通过IP网络传送多媒体数据。RTSP在体系结构上位于RTP(实时传输）和RTCP（实时控制）之上，它使用 TCP或RTP完成数据传输。HTTP与RTSP相比，HTTP传送HTML，而RTP传送的是多媒体数据。HTTP请求由客户机发出，服务器作出响应；使用RTSP时，客户机和服务器都可以发出请求，即RTSP可以是双向的。
实时流协议（RTSP）是应用级协议，控制实时数据的发送。RTSP提供了一个可扩展框架，使实时数据，如音频与视频，的受控、点播成为可能。
RTP是目前解决流媒体实时传输问题的最好办法，如果要开发，可以选择JRTPLIB库。JRTPLIB是一个面向对象的RTP库，它完全遵循RFC 1889设计。JRTPLIB是一个用C++语言实现的RTP库，目前已经可以运行在Windows、Linux、FreeBSD、Solaris、Unix和 VxWorks等多种操作系统上。
了解更多RTP参考：
http://www.cnitblog.com/zouzheng/archive/2008/01/04/38449.html
下面的例子参考jrtplib的example1,加了解析负载的部分。
// RTPClient.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "rtpsession.h"
#include "rtppacket.h"
#include "rtpudpv4transmitter.h"
#include "rtpipv4address.h"
#include "rtpsessionparams.h"
#include "rtperrors.h"
#include
#include
#include
#include "windows.h"
#include <iostream>
#include
using namespace std;
#pragma comment(lib,"jrtplib.lib")
#pragma comment(lib,"jthread.lib")
#pragma comment(lib,"WS2_32.lib")
void checkerror(int rtperr)
...{
if (rtperr < 0)
...{
std::cout << "ERROR: " << RTPGetErrorString(rtperr) << std::endl;
exit(-1);
}
}
int main(int argc, char* argv[])
...{
#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;
BYTE *pBuffer;
BYTE *pfBuffer;
//输入一些必要信息
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;
}
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;
// 创建RTP session
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);
status = sess.Create(sessparams,&transparams);
checkerror(status);
RTPIPv4Address addr(destip,destport);
status = sess.AddDestination(addr);
checkerror(status);
for (i = 1 ; i <= num ; i++)
...{
printf(" Sending packet %d/%d ",i,num);
// 发送数据“1234567890”
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 ! ");
std::cout << "Got packet with "
<< "extended sequence number "
<< pack->GetExtendedSequenceNumber()
<< " from SSRC " << pack->GetSSRC()
<< std::endl;
int dataLength = pack->GetPayloadLength();
pfBuffer =(unsigned char*)pack->GetPayloadData();
pBuffer = new BYTE[dataLength + 1];
memcpy(pBuffer, pfBuffer, dataLength);
pBuffer[dataLength] = 0;
std::cout << pBuffer << std::endl;
// 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;
}
如图
关于jrtplib的环境，可以参考网上很多的资料，也可以从我的资源里下载，我已经编译好了相关lib,只要加的VC环境里就可以了。
执行测试程序的效果如下：
Enter local portbase:
8000
Enter the destination IP address
127.0.0.1
Enter the destination port
8000
Number of packets you wish to be sent:
5
Sending packet 1/5
Got packet !
Got packet with extended sequence number 59262 from SSRC 3029241192
1234567890
Sending packet 2/5
Got packet !
Got packet with extended sequence number 59263 from SSRC 3029241192
1234567890
Sending packet 3/5
Sending packet 4/5
Got packet !
Got packet with extended sequence number 59264 from SSRC 3029241192
1234567890
Got packet !
Got packet with extended sequence number 59265 from SSRC 3029241192
1234567890
Sending packet 5/5
上面执行的意思是程序自己开了8000端口，然后往自己的8000发送，所以不仅发送出去，还收到并解析出了内容。如果要往另外机器上发，另一个机器上也运行这个程序就可以了。当然可以专门再写一个接收端。