編譯jrtplib和jthread

最近要做網絡監控視頻的傳輸，以前就接觸過圖像處理的基本東西，對於網絡稍微瞭解一點，對於視頻的編解碼則是一竅不通。這兩週查閱了不少資料，發現一般使

用的網路協議都是RTP/RTCP，網絡上找了不少資料，本來想整個現成的例子看看，下了不少發現都不滿意，只好自己找到那個很牛的老外Jori寫的開源的RTP庫jrtplib研究一下自己編譯一下，學學了。

首先從他的個人網站上http://research.edm.uhasselt.be/~jori/page/index.php?n=CS.Jrtplib下載最新的jrtplib-3.9.0，以及最新的jthread-1.3.0（他的頁面上也有下載），解壓完之後，看了看ReadMe發現需要Cmake編譯，oh！mygod！慢慢來吧。

使用Cmake_gui 2.8版本，首先編譯生成jthread.lib。

添加完路徑之後，很順利的就可以得到vs2005下的工程文件，編譯之後可以在C:/Program Files/jthread/include（默認的路徑）下看到jthread的頭文件以及在C:/Program Files/jthread/lib下的lib文件（一般吧debug和release都編譯一下）。

然後就是jrtplib的編譯了。

jrtplib的cmake編譯需要jthread.lib（jthread_d.lib）編譯，cmake不會用，開始時出現錯誤，後來自己摸索着試了試，成功了，就是在編譯幾個example時發現有warning，也沒什麼關係。設置如圖所示

這樣再generate就可以了（不知道以後有沒有問題，反正現在沒問題）。

然後就是vs2005中的生成lib庫了。

首先需要將所有jrtplib中src下的頭文件中包含jmutex.h和jthread.h的include全部修改爲include "jmutex."和include"jthread.h"，然後進行下一步

打開工程文件編譯之後安裝，可以在C:\Program Files\jrtplib下面看到兩個文件夾include和lib分別放着頭文件和庫文件。

打開example1，進行相應的設置之後run，發現可以運行了！

這樣應該就可以在工程中使用jrtplib庫了---------還沒有試，期待ing。。。。。

另：在Jori的主頁上有關於這兩個庫jrtplib和jthread的使用手冊的pdf下載可以參考。

NOTE：開始時沒有將jthread和jmutex的include修改，雖然編譯成功了，運行example也可以但是自己編的程序就出問題，後來參考了一下http://blog.csdn.net/aaronalan/article/details/5153604 重新編譯的才行了。

附上一個在網上找到的例子：

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/*
Here's a small IPv4 example: it asks for a portbase and a destination and
starts sending packets to that destination.
*/
#include "rtpsession.h"
#include "rtpudpv4transmitter.h"
#include "rtpipv4address.h"
#include "rtpsessionparams.h"
#include "rtperrors.h"
#include "rtppacket.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>
using namespace jrtplib;
#pragma comment(lib,"jrtplib_d.lib")
#pragma comment(lib,"jthread_d.lib")
#pragma comment(lib,"ws2_32.lib")
//
// 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;
uint32_t destip;
std::string ipstr;
int status,i,num;
BYTE *pBuffer;
BYTE *pfBuffer;
// First, we'll ask for the necessary information
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
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);
status = sess.Create(sessparams,&transparams);
checkerror(status);
RTPIPv4Address addr(destip,destport);
status = sess.AddDestination(addr);
checkerror(status);
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);
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 !\n");
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;
delete []pBuffer;
pBuffer = NULL;
// 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;
}

/*
   Here's a small IPv4 example: it asks for a portbase and a destination and 
   starts sending packets to that destination.
*/

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

using namespace jrtplib;
#pragma comment(lib,"jrtplib_d.lib")
#pragma comment(lib,"jthread_d.lib")
#pragma comment(lib,"ws2_32.lib")
//
// 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;
	uint32_t destip;
	std::string ipstr;
	int status,i,num;
	BYTE *pBuffer;
	BYTE *pfBuffer;
        // First, we'll ask for the necessary information
		
	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
	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);
	status = sess.Create(sessparams,&transparams);	
	checkerror(status);
	
	RTPIPv4Address addr(destip,destport);
	
	status = sess.AddDestination(addr);
	checkerror(status);
	
	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);
		
		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 !\n");

					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;
 					delete []pBuffer;
 					pBuffer = NULL;
					// 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;
}

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