RTP传输H264码流，使用JRTP接收不到数据

[BlueCheney1990]

最近在做H264视频传输的项目，使用了JRTP。发送端先使用x264编码YUV文件，然后使用JRTP发出数据。使用VLC-0.9.6能正常播放，SDP文件如下：

m=video 1234 RTP/AVP 96
a=rtpmap:96 H264
a=framerate:25
c=IN IP4 114.214.166.190

但是使用JRTP库参考网上例子自己写了一个接收端程序却收不到数据。接收端程序如下：

#include "./jrtp/rtpsession.h"
#include "./jrtp/rtppacket.h"
#include "./jrtp/rtpudpv4transmitter.h"
#include "./jrtp/rtpipv4address.h"
#include "./jrtp/rtpsessionparams.h"
#include "./jrtp/rtperrors.h"
#include "./jrtp/rtpmemorymanager.h"
#include "./jrtp/rtpsourcedata.h"

#include "./jthread/jthread.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;

#ifdef WIN32
#pragma comment(lib, "jrtplib_d.lib")
#pragma comment(lib, "jthread_d.lib")
#pragma comment(lib, "ws2_32.lib")
#endif

class MyRTPSession : public RTPSession
{
protected:
	void OnPollThreadStep();
	void ProcessRTPPacket(const RTPSourceData &srcdat, const RTPPacket &packet);
};

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

void MyRTPSession::OnPollThreadStep() //处理RTCP数据包
{
	bool done = false;
	int total = 0;

	RTPTime delay(0.020);
	RTPTime starttime = RTPTime::CurrentTime();

	while (!done)
	{
#ifndef RTP_SUPPORT_THREAD
		int status = Poll();
		checkerror(status);
#endif

		BeginDataAccess();

		if (GotoFirstSourceWithData())
		{
			do
			{
				RTPSourceData *srcdat;

				srcdat = GetCurrentSourceInfo();
				if (srcdat->SR_HasInfo())//打印SR信息
				{
					std::cout << "SR Info:" << std::endl;
					std::cout << "GetSSRC   :％u " <<  srcdat->GetSSRC() << std::endl;
					std::cout <<  "number   :％d " << total++ << std::endl;
					std::cout << "SR_GetByteCount   :％u " << srcdat->SR_GetByteCount() << std::endl;
					std::cout << "SR_GetPacketCount   :％u " << srcdat->SR_GetPacketCount() << std::endl;
				}
				srcdat->FlushPackets();
			} while (GotoNextSource());
		}

		EndDataAccess();

		RTPTime::Wait(delay);

		RTPTime t = RTPTime::CurrentTime();
		t -= starttime;
		if (t > RTPTime(60.0))
			done = true;
	}	
}

void MyRTPSession::ProcessRTPPacket(const RTPSourceData &srcdat, const RTPPacket &rtppack)
{
	// You can inspect the packet and the source's info here
	if (srcdat.SR_HasInfo())
	{
		std::cout << "SR Info:" << std::endl;
		std::cout << "GetSSRC			:％u " << srcdat.GetSSRC() << std::endl;
		std::cout << "SR_GetByteCount   :％u " << srcdat.SR_GetByteCount() << std::endl;
		std::cout << "SR_GetPacketCount :％u " << srcdat.SR_GetPacketCount() << std::endl;
	}
}

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

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

	portbase = 8000;
	ipstr = "127.0.0.1";
	//std::cout << "Enter local portbase:" << std::endl;
	//std::cin >> portbase;
	//std::cout << std::endl;

	RTPUDPv4TransmissionParams transparams;
	RTPSessionParams sessparams;
	sessparams.SetOwnTimestampUnit(1.0 / 90000.0);

	transparams.SetPortbase(portbase);
	status = sess.Create(sessparams, &transparams);
	checkerror(status);
	uint32_t destip = inet_addr(ipstr.c_str());
	if (destip == INADDR_NONE){
		std::cerr << "Bad IP address specified" << std::endl;
		return -1;
	}
	destip = ntohl(destip);
	port = 1234;
	RTPIPv4Address addr(destip, port);

	status = sess.AddDestination(addr);
	checkerror(status);

	sessparams.SetUsePollThread(true);

	std::cout << "Prepare for data receive..." << std::endl;

	while (1) //处理RTP数据包
	{
		bool done = false;
		int total = 0;

		RTPTime delay(0.020);
		RTPTime starttime = RTPTime::CurrentTime();

		while (!done)
		{
#ifndef RTP_SUPPORT_THREAD
			int status = Poll();
			checkerror(status);
#endif

			sess.BeginDataAccess();

			if (sess.GotoFirstSourceWithData())
			{
				do
				{
					RTPPacket *pack;

					while ((pack = sess.GetNextPacket()) != NULL)
					{
						std::cout << "Seq_num		:" << pack->GetSequenceNumber() << std::endl;
						std::cout << "CSRC			: " << pack->GetCSRCCount() << std::endl;
						std::cout << "SSRC			: " << pack->GetSSRC() << std::endl;
						std::cout << "Timestamp		: " << pack->GetTimestamp() << std::endl;
						std::cout << "Packet Length : " << pack->GetPacketLength() << std::endl;
						sess.DeletePacket(pack);
					}
				} while (sess.GotoNextSourceWithData());
			}

			sess.EndDataAccess();

			RTPTime::Wait(delay);

			RTPTime t = RTPTime::CurrentTime();
			t -= starttime;
			if (t > RTPTime(60.0))
				done = true;
		}
	}

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

#ifdef WIN32
	WSACleanup();
#endif // WIN32

	return 0;
}

发送端设置目标地址为127.0.0.1，目标端口为1234，portbase为6000。不知道接收端程序问题出在哪儿？还有一个始终不明白的是，portbase和目标端口有什么区别？为何要设置portbase？
谢谢各位大神的回复！

[BlueCheney1990]

还有一个问题是，接收端和发送端的portbase必须设置为一样的吗？我试过设置为一样的还是不能接收。

RTPTime::Wait(delay);
 
            RTPTime t = RTPTime::CurrentTime();
            t -= starttime;
            if (t > RTPTime(60.0))
                done = true;

这几个语句位置错了，应该在里层的while循环之外，是为了终止最外层while死循环的。

[BlueCheney1990]

找到问题所在了，需要将客户端的portbase和port同时设置为1234.

[BlueCheney1990]

已经能正确收到rtp包了。客户端和服务器都重载了OnPollThreadStep函数，但是还是不能收到rtcp数据包，不知道问题出在哪儿？

[张希]

portbase是发送端的端口号 destbase是接收端的端口号