/******************************************************************************
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* FILE: RtpApp2.cpp
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* Description:
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* Implement for CRtpApp2 class.
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*
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* Modified Code History
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* Mark Date By Modification Reason
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*******************************************************************************
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* 01 2010-10-3 songxw Initial creation.
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******************************************************************************/
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#include <sys/time.h>
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#include <unistd.h>
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#include "RtpApp2.h"
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CRtpApp2::CRtpApp2()
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{
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tsunit = 1.0 / 8000.0;
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bSendTo = false;
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struct timezone tzone;
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gettimeofday(&RunTime, &tzone);
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SeqNum = 0;
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SendTimeForNAT = 0;
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}
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CRtpApp2::~CRtpApp2()
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{
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}
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/******************************************************************************
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* Function:
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* Create rtp session and be ready for receiving data.
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******************************************************************************/
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int CRtpApp2::CreateSession(UINT16 ListenPort, UINT32 nSsrc, bool usethread)
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{
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SessParams.SetUsePollThread(usethread);
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SessParams.SetOwnTimestampUnit(tsunit);
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SessParams.SetAcceptOwnPackets(true);
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TransParams.SetPortbase(ListenPort);
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SessParams.SetMaximumPacketSize(60*1024);
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if(nSsrc > 0)
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{
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SessParams.SetUsePredefinedSSRC(true);
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SessParams.SetPredefinedSSRC(nSsrc);
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}
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int iErrNum = Create(SessParams, &TransParams);
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if (iErrNum < 0)
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{
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string RtpError = RTPGetErrorString(iErrNum);
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DBGPrint(M_RtpSessMgr, ERROR_LEVEL, "Create RTP Session error! Reason: %s!", RtpError.c_str() );
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return -1;
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}
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SetDefaultPayloadType(0);
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SetDefaultMark(false);
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SetDefaultTimestampIncrement(0);
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// IncrementTimestampDefault();
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// IncrementTimestamp(1);
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return 0;
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}
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/******************************************************************************
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* Function:
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* Set source ip address, port and session ID. Send several packets to traverse
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* NAT.
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******************************************************************************/
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int CRtpApp2::NatMappingControl(char IpStr[], UINT16 port, int SSId)
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{
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SessionID = SSId;
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RTPIPv4Address RtpAddr( ntohl(inet_addr(IpStr) ), port);
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int iErrNum = AddDestination(RtpAddr);
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if (iErrNum != 0)
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{
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string RtpError = RTPGetErrorString(iErrNum);
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DBGPrint(M_RtpSessMgr, ERROR_LEVEL, "AddDestination <%s: %d> fail! Reason: %s!", IpStr, port, RtpError.c_str() );
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return -1;
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}
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SendNatMappingPacket();
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usleep(1000);
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SendNatMappingPacket();
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usleep(1000);
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SendNatMappingPacket();
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return 0;
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}
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/******************************************************************************
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* Function:
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* Hook function of receiving a rtp packet.
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******************************************************************************/
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void CRtpApp2::CBRtpRecv2()
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{
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}
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/******************************************************************************
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* Function:
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* Rtp session data poll function.
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******************************************************************************/
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void CRtpApp2::OnPollThreadStep()
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{
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CBRtpRecv2();
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}
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/******************************************************************************
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* Function:
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* Bye operation of rtp session.
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******************************************************************************/
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void CRtpApp2::RtpDestroy()
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{
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BYEDestroy(RTPTime(1, 0), 0, 0);
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}
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/******************************************************************************
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* Function:
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* Send a packet to traverse NAT and keep mapping status to let rtp data come.
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******************************************************************************/
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void CRtpApp2::SendNatMappingPacket(void)
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{
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UINT8 data[48+1] = {0};
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//Set version and payload type
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data[0] = 0x80;
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data[1] = 0x30; //Mark is always true. 0xb0 = 0x80 + 0x30
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//Set sequence number
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*( (UINT16 *)&data[2] ) = htons(SeqNum++);
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struct timeval CurrTVal;
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struct timezone tzone;
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gettimeofday(&CurrTVal, &tzone);
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int timestamp = (CurrTVal.tv_sec - RunTime.tv_sec) * 1000 + (CurrTVal.tv_usec - RunTime.tv_usec) / 1000; //(ms)
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//Set timestamp
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*( (UINT32 *)&data[4] ) = htonl(timestamp);
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//Set SSRC
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*( (UINT32 *)&data[8] ) = htonl(SessionID);
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//Set payload data
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snprintf( (char *)&data[12], 36, "%s", "A Packet to traverse NAT.");
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SendPacketIntegratedData(data, 48);
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}
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