VC 6 RTP流媒体传输协议编程实例(

作者：袖梨 2022-07-02

资源下载：
http://download.111com.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 <winsock2.h>
#include <stdlib.h>
#include <stdio.h>
#include "windows.h"
#include <iostream>
#include <string>
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;
} 编译注意修改每个Source File的code generation下的Use run-time library为Debug Multithreaded DLL。
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。

VC 6 RTP流媒体传输协议编程实例(

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