rtpsession.cpp

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/*

  This file is a part of JRTPLIB
  Copyright (c) 1999-2006 Jori Liesenborgs

  Contact: [e-mail]

  This library was developed at the "Expertisecentrum Digitale Media"
  (http://www.edm.uhasselt.be), a research center of the Hasselt University
  (http://www.uhasselt.be). The library is based upon work done for 
  my thesis at the School for Knowledge Technology (Belgium/The Netherlands).

  Permission is hereby granted, free of charge, to any person obtaining a
  copy of this software and associated documentation files (the "Software"),
  to deal in the Software without restriction, including without limitation
  the rights to use, copy, modify, merge, publish, distribute, sublicense,
  and/or sell copies of the Software, and to permit persons to whom the
  Software is furnished to do so, subject to the following conditions:

  The above copyright notice and this permission notice shall be included
  in all copies or substantial portions of the Software.

  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  IN THE SOFTWARE.

*/

#include "rtpsession.h"
#include "rtperrors.h"
#include "rtppollthread.h"
#include "rtpudpv4transmitter.h"
#include "rtpudpv6transmitter.h"
#include "rtpsessionparams.h"
#include "rtpdefines.h"
#include "rtprawpacket.h"
#include "rtppacket.h"
#include "rtptimeutilities.h"
#include "rtcpcompoundpacket.h"
#ifndef WIN32
	#include <unistd.h>
	#include <stdlib.h>
#else
	#include <winbase.h>
#endif // WIN32

#ifdef RTPDEBUG
	#include <iostream>
#endif // RTPDEBUG

#include "rtpdebug.h"

#ifdef RTP_SUPPORT_THREAD
	#define SOURCES_LOCK					{ if (usingpollthread) sourcesmutex.Lock(); }
	#define SOURCES_UNLOCK					{ if (usingpollthread) sourcesmutex.Unlock(); }
	#define BUILDER_LOCK					{ if (usingpollthread) buildermutex.Lock(); }
	#define BUILDER_UNLOCK					{ if (usingpollthread) buildermutex.Unlock(); }
	#define SCHED_LOCK					{ if (usingpollthread) schedmutex.Lock(); }
	#define SCHED_UNLOCK					{ if (usingpollthread) schedmutex.Unlock(); }
#else
	#define SOURCES_LOCK
	#define SOURCES_UNLOCK
	#define BUILDER_LOCK
	#define BUILDER_UNLOCK
	#define SCHED_LOCK
	#define SCHED_UNLOCK
#endif // RTP_SUPPORT_THREAD

RTPSession::RTPSession(RTPTransmitter::TransmissionProtocol proto /* = RTPTransmitter::IPv4UDPProto */ ) 
	: protocol(proto),sources(*this),rtcpsched(sources),rtcpbuilder(sources,packetbuilder)
{
	created = false;
#if (defined(WIN32) || defined(_WIN32_WCE))
	timeinit.Dummy();
#endif // WIN32 || _WIN32_WCE
}

RTPSession::~RTPSession()
{
	Destroy();
}

int RTPSession::Create(const RTPSessionParams &sessparams,const RTPTransmissionParams *transparams /* = 0 */)
{
	int status;
	
	if (created)
		return ERR_RTP_SESSION_ALREADYCREATED;

	usingpollthread = sessparams.IsUsingPollThread();
	useSR_BYEifpossible = sessparams.GetSenderReportForBYE();
	
	// Check max packet size
	
	if ((maxpacksize = sessparams.GetMaximumPacketSize()) < RTP_MINPACKETSIZE)
		return ERR_RTP_SESSION_MAXPACKETSIZETOOSMALL;
		
	// Initialize the transmission component
	
	rtptrans = 0;
	switch(protocol)
	{
	case RTPTransmitter::IPv4UDPProto:
		rtptrans = new RTPUDPv4Transmitter();
		break;
#ifdef RTP_SUPPORT_IPV6
	case RTPTransmitter::IPv6UDPProto:
		rtptrans = new RTPUDPv6Transmitter();
		break;
#endif // RTP_SUPPORT_IPV6
	case RTPTransmitter::UserDefinedProto:
		rtptrans = NewUserDefinedTransmitter();
		if (rtptrans == 0)
			return ERR_RTP_SESSION_USERDEFINEDTRANSMITTERNULL;
		break;
	default:
		return ERR_RTP_SESSION_UNSUPPORTEDTRANSMISSIONPROTOCOL;
	}
	
	if (rtptrans == 0)
		return ERR_RTP_OUTOFMEM;
	if ((status = rtptrans->Init(usingpollthread)) < 0)
	{
		delete rtptrans;
		return status;
	}
	if ((status = rtptrans->Create(maxpacksize,transparams)) < 0)
	{
		delete rtptrans;
		return status;
	}

	// Initialize packet builder
	
	if ((status = packetbuilder.Init(maxpacksize)) < 0)
	{
		delete rtptrans;
		return status;
	}

#ifdef RTP_SUPPORT_PROBATION

	// Set probation type
	sources.SetProbationType(sessparams.GetProbationType());

#endif // RTP_SUPPORT_PROBATION

	// Add our own ssrc to the source table
	
	if ((status = sources.CreateOwnSSRC(packetbuilder.GetSSRC())) < 0)
	{
		packetbuilder.Destroy();
		delete rtptrans;
		return status;
	}

	// Set the initial receive mode
	
	if ((status = rtptrans->SetReceiveMode(sessparams.GetReceiveMode())) < 0)
	{
		packetbuilder.Destroy();
		sources.Clear();
		delete rtptrans;
		return status;
	}

	// Init the RTCP packet builder
	
	double timestampunit = sessparams.GetOwnTimestampUnit();
	uint8_t buf[1024];
	size_t buflen = 1024;
	
	if ((status = CreateCNAME(buf,&buflen,sessparams.GetResolveLocalHostname())) < 0)
	{
		packetbuilder.Destroy();
		sources.Clear();
		delete rtptrans;
		return status;
	}
	
	if ((status = rtcpbuilder.Init(maxpacksize,timestampunit,buf,buflen)) < 0)
	{
		packetbuilder.Destroy();
		sources.Clear();
		delete rtptrans;
		return status;
	}

	// Set scheduler parameters
	
	rtcpsched.Reset();
	rtcpsched.SetHeaderOverhead(rtptrans->GetHeaderOverhead());

	RTCPSchedulerParams schedparams;

	sessionbandwidth = sessparams.GetSessionBandwidth();
	controlfragment = sessparams.GetControlTrafficFraction();
	
	if ((status = schedparams.SetRTCPBandwidth(sessionbandwidth*controlfragment)) < 0)
	{
		delete rtptrans;
		packetbuilder.Destroy();
		sources.Clear();
		rtcpbuilder.Destroy();
		return status;
	}
	if ((status = schedparams.SetSenderBandwidthFraction(sessparams.GetSenderControlBandwidthFraction())) < 0)
	{
		delete rtptrans;
		packetbuilder.Destroy();
		sources.Clear();
		rtcpbuilder.Destroy();
		return status;
	}
	if ((status = schedparams.SetMinimumTransmissionInterval(sessparams.GetMinimumRTCPTransmissionInterval())) < 0)
	{
		delete rtptrans;
		packetbuilder.Destroy();
		sources.Clear();
		rtcpbuilder.Destroy();
		return status;
	}
	schedparams.SetUseHalfAtStartup(sessparams.GetUseHalfRTCPIntervalAtStartup());
	schedparams.SetRequestImmediateBYE(sessparams.GetRequestImmediateBYE());
	
	rtcpsched.SetParameters(schedparams);

	// copy other parameters
	
	acceptownpackets = sessparams.AcceptOwnPackets();
	membermultiplier = sessparams.GetSourceTimeoutMultiplier();
	sendermultiplier = sessparams.GetSenderTimeoutMultiplier();
	byemultiplier = sessparams.GetBYETimeoutMultiplier();
	collisionmultiplier = sessparams.GetCollisionTimeoutMultiplier();
	notemultiplier = sessparams.GetNoteTimeoutMultiplier();

	// Do thread stuff if necessary
	
#ifdef RTP_SUPPORT_THREAD
	pollthread = 0;
	if (usingpollthread)
	{
		if (!sourcesmutex.IsInitialized())	
		{
			if (sourcesmutex.Init() < 0)
			{
				delete rtptrans;
				packetbuilder.Destroy();
				sources.Clear();
				rtcpbuilder.Destroy();
				return ERR_RTP_SESSION_CANTINITMUTEX;
			}
		}
		if (!buildermutex.IsInitialized())
		{
			if (buildermutex.Init() < 0)
			{
				delete rtptrans;
				packetbuilder.Destroy();
				sources.Clear();
				rtcpbuilder.Destroy();
				return ERR_RTP_SESSION_CANTINITMUTEX;
			}
		}
		if (!schedmutex.IsInitialized())
		{
			if (schedmutex.Init() < 0)
			{
				delete rtptrans;
				packetbuilder.Destroy();
				sources.Clear();
				rtcpbuilder.Destroy();
				return ERR_RTP_SESSION_CANTINITMUTEX;
			}
		}
		
		pollthread = new RTPPollThread(*this,rtcpsched);
		if (pollthread == 0)
		{
			delete rtptrans;
			packetbuilder.Destroy();
			sources.Clear();
			rtcpbuilder.Destroy();
			return ERR_RTP_OUTOFMEM;
		}
		if ((status = pollthread->Start(rtptrans)) < 0)
		{
			delete rtptrans;
			delete pollthread;
			packetbuilder.Destroy();
			sources.Clear();
			rtcpbuilder.Destroy();
			return status;
		}
	}
#endif // RTP_SUPPORT_THREAD	
	
	created = true;
	return 0;
}

void RTPSession::Destroy()
{
	if (!created)
		return;

#ifdef RTP_SUPPORT_THREAD
	if (pollthread)
		delete pollthread;
#endif // RTP_SUPPORT_THREAD
	
	delete rtptrans;
	packetbuilder.Destroy();
	rtcpbuilder.Destroy();
	rtcpsched.Reset();
	collisionlist.Clear();
	sources.Clear();

	std::list<RTCPCompoundPacket *>::const_iterator it;

	for (it = byepackets.begin() ; it != byepackets.end() ; it++)
		delete (*it);
	byepackets.clear();
	
	created = false;
}

void RTPSession::BYEDestroy(const RTPTime &maxwaittime,const void *reason,size_t reasonlength)
{
	if (!created)
		return;

	// first, stop the thread so we have full control over all components
	
#ifdef RTP_SUPPORT_THREAD
	if (pollthread)
		delete pollthread;
#endif // RTP_SUPPORT_THREAD

	RTPTime stoptime = RTPTime::CurrentTime();
	stoptime += maxwaittime;

	// add bye packet to the list if we've sent data

	RTCPCompoundPacket *pack;

	if (rtptrans->GetNumRTPPacketsSent() != 0 || rtptrans->GetNumRTCPPacketsSent() != 0)
	{
		int status;
		
		reasonlength = (reasonlength>RTCP_BYE_MAXREASONLENGTH)?RTCP_BYE_MAXREASONLENGTH:reasonlength;
	       	status = rtcpbuilder.BuildBYEPacket(&pack,reason,reasonlength,useSR_BYEifpossible);
		if (status >= 0)
		{
			byepackets.push_back(pack);
	
			if (byepackets.size() == 1)
				rtcpsched.ScheduleBYEPacket(pack->GetCompoundPacketLength());
		}
	}
	
	if (!byepackets.empty())
	{
		bool done = false;
		
		while (!done)
		{
			RTPTime curtime = RTPTime::CurrentTime();
			
			if (curtime >= stoptime)
				done = true;
		
			if (rtcpsched.IsTime())
			{
				pack = *(byepackets.begin());
				byepackets.pop_front();
			
				rtptrans->SendRTCPData(pack->GetCompoundPacketData(),pack->GetCompoundPacketLength());
				delete pack;
				if (!byepackets.empty()) // more bye packets to send, schedule them
					rtcpsched.ScheduleBYEPacket((*(byepackets.begin()))->GetCompoundPacketLength());
				else
					done = true;
			}
			if (!done)
				RTPTime::Wait(RTPTime(0,100000));
		}
	}
	
	delete rtptrans;
	packetbuilder.Destroy();
	rtcpbuilder.Destroy();
	rtcpsched.Reset();
	collisionlist.Clear();
	sources.Clear();

	// clear rest of bye packets
	std::list<RTCPCompoundPacket *>::const_iterator it;

	for (it = byepackets.begin() ; it != byepackets.end() ; it++)
		delete (*it);
	byepackets.clear();
	
	created = false;
}

bool RTPSession::IsActive()
{
	return created;
}

uint32_t RTPSession::GetLocalSSRC()
{
	if (!created)
		return 0;
	
	uint32_t ssrc;

	BUILDER_LOCK
	ssrc = packetbuilder.GetSSRC();
	BUILDER_UNLOCK
	return ssrc;
}

int RTPSession::AddDestination(const RTPAddress &addr)
{
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;
	return rtptrans->AddDestination(addr);
}

int RTPSession::DeleteDestination(const RTPAddress &addr)
{
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;
	return rtptrans->DeleteDestination(addr);
}

void RTPSession::ClearDestinations()
{
	if (!created)
		return;
	rtptrans->ClearDestinations();
}

bool RTPSession::SupportsMulticasting()
{
	if (!created)
		return false;
	return rtptrans->SupportsMulticasting();
}

int RTPSession::JoinMulticastGroup(const RTPAddress &addr)
{
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;
	return rtptrans->JoinMulticastGroup(addr);
}

int RTPSession::LeaveMulticastGroup(const RTPAddress &addr)
{
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;
	return rtptrans->LeaveMulticastGroup(addr);
}

void RTPSession::LeaveAllMulticastGroups()
{
	if (!created)
		return;
	rtptrans->LeaveAllMulticastGroups();
}

int RTPSession::SendPacket(const void *data,size_t len)
{
	int status;
	
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;

	BUILDER_LOCK
	if ((status = packetbuilder.BuildPacket(data,len)) < 0)
	{
		BUILDER_UNLOCK
		return status;
	}
	if ((status = rtptrans->SendRTPData(packetbuilder.GetPacket(),packetbuilder.GetPacketLength())) < 0)
	{
		BUILDER_UNLOCK
		return status;
	}
	BUILDER_UNLOCK

	SOURCES_LOCK
	sources.SentRTPPacket();
	SOURCES_UNLOCK
	return 0;
}

int RTPSession::SendPacket(const void *data,size_t len,
                uint8_t pt,bool mark,uint32_t timestampinc)
{
	int status;

	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;
	
	BUILDER_LOCK
	if ((status = packetbuilder.BuildPacket(data,len,pt,mark,timestampinc)) < 0)
	{
		BUILDER_UNLOCK
		return status;
	}
	if ((status = rtptrans->SendRTPData(packetbuilder.GetPacket(),packetbuilder.GetPacketLength())) < 0)
	{
		BUILDER_UNLOCK
		return status;
	}
	BUILDER_UNLOCK
	
	SOURCES_LOCK
	sources.SentRTPPacket();
	SOURCES_UNLOCK
	return 0;
}

int RTPSession::SendPacketEx(const void *data,size_t len,
                  uint16_t hdrextID,const void *hdrextdata,size_t numhdrextwords)
{
	int status;
	
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;

	BUILDER_LOCK
	if ((status = packetbuilder.BuildPacketEx(data,len,hdrextID,hdrextdata,numhdrextwords)) < 0)
	{
		BUILDER_UNLOCK
		return status;
	}
	if ((status = rtptrans->SendRTPData(packetbuilder.GetPacket(),packetbuilder.GetPacketLength())) < 0)
	{
		BUILDER_UNLOCK
		return status;
	}
	BUILDER_UNLOCK

	SOURCES_LOCK
	sources.SentRTPPacket();
	SOURCES_UNLOCK
	return 0;
}

int RTPSession::SendPacketEx(const void *data,size_t len,
                  uint8_t pt,bool mark,uint32_t timestampinc,
                  uint16_t hdrextID,const void *hdrextdata,size_t numhdrextwords)
{
	int status;
	
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;
	
	BUILDER_LOCK
	if ((status = packetbuilder.BuildPacketEx(data,len,pt,mark,timestampinc,hdrextID,hdrextdata,numhdrextwords)) < 0)
	{
		BUILDER_UNLOCK
		return status;
	}
	if ((status = rtptrans->SendRTPData(packetbuilder.GetPacket(),packetbuilder.GetPacketLength())) < 0)
	{
		BUILDER_UNLOCK
		return status;
	}
	BUILDER_UNLOCK

	SOURCES_LOCK
	sources.SentRTPPacket();
	SOURCES_UNLOCK
	return 0;
}

int RTPSession::SetDefaultPayloadType(uint8_t pt)
{
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;
	
	int status;
	
	BUILDER_LOCK
	status = packetbuilder.SetDefaultPayloadType(pt);
	BUILDER_UNLOCK
	return status;
}

int RTPSession::SetDefaultMark(bool m)
{
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;

	int status;

	BUILDER_LOCK
	status = packetbuilder.SetDefaultMark(m);
	BUILDER_UNLOCK
	return status;
}

int RTPSession::SetDefaultTimestampIncrement(uint32_t timestampinc)
{
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;

	int status;

	BUILDER_LOCK
	status = packetbuilder.SetDefaultTimestampIncrement(timestampinc);
	BUILDER_UNLOCK
	return status;
}

int RTPSession::IncrementTimestamp(uint32_t inc)
{
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;

	int status;

	BUILDER_LOCK
	status = packetbuilder.IncrementTimestamp(inc);
	BUILDER_UNLOCK
	return status;
}

int RTPSession::IncrementTimestampDefault()
{
	if (!created)
		return ERR_RTP_SESSION_NOTCREATED;

	int status;
	
	BUILDER_LOCK
	status = packetbuilder.IncrementTimestampDefault();