rtpsources.cpp

最新的jrtplib

/*

  This file is a part of JRTPLIB
  Copyright (c) 1999-2007 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 "rtpsources.h"
#include "rtperrors.h"
#include "rtprawpacket.h"
#include "rtpinternalsourcedata.h"
#include "rtptimeutilities.h"
#include "rtpdefines.h"
#include "rtcpcompoundpacket.h"
#include "rtcppacket.h"
#include "rtcpapppacket.h"
#include "rtcpbyepacket.h"
#include "rtcpsdespacket.h"
#include "rtcpsrpacket.h"
#include "rtcprrpacket.h"
#include "rtptransmitter.h"

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

#include "rtpdebug.h"

RTPSources::RTPSources(ProbationType probtype,RTPMemoryManager *mgr) : RTPMemoryObject(mgr),sourcelist(mgr,RTPMEM_TYPE_CLASS_SOURCETABLEHASHELEMENT)
{
	totalcount = 0;
	sendercount = 0;
	activecount = 0;
	owndata = 0;
#ifdef RTP_SUPPORT_PROBATION
	probationtype = probtype;
#endif // RTP_SUPPORT_PROBATION
}

RTPSources::~RTPSources()
{
	Clear();
}

void RTPSources::Clear()
{
	ClearSourceList();
}

void RTPSources::ClearSourceList()
{
	sourcelist.GotoFirstElement();
	while (sourcelist.HasCurrentElement())
	{
		RTPInternalSourceData *sourcedata;

		sourcedata = sourcelist.GetCurrentElement();
		RTPDelete(sourcedata,GetMemoryManager());
		sourcelist.GotoNextElement();
	}
	sourcelist.Clear();
	owndata = 0;
	totalcount = 0;
	sendercount = 0;
	activecount = 0;
}

int RTPSources::CreateOwnSSRC(uint32_t ssrc)
{
	if (owndata != 0)
		return ERR_RTP_SOURCES_ALREADYHAVEOWNSSRC;
	if (GotEntry(ssrc))
		return ERR_RTP_SOURCES_SSRCEXISTS;

	int status;
	bool created;
	
	status = ObtainSourceDataInstance(ssrc,&owndata,&created);
	if (status < 0)
	{
		owndata = 0; // just to make sure
		return status;
	}
	owndata->SetOwnSSRC();	
	owndata->SetRTPDataAddress(0);
	owndata->SetRTCPDataAddress(0);

	// we've created a validated ssrc, so we should increase activecount
	activecount++;

	OnNewSource(owndata);
	return 0;
}

int RTPSources::DeleteOwnSSRC()
{
	if (owndata == 0)
		return ERR_RTP_SOURCES_DONTHAVEOWNSSRC;

	uint32_t ssrc = owndata->GetSSRC();

	sourcelist.GotoElement(ssrc);
	sourcelist.DeleteCurrentElement();

	totalcount--;
	if (owndata->IsSender())
		sendercount--;
	if (owndata->IsActive())
		activecount--;

	OnRemoveSource(owndata);
	
	RTPDelete(owndata,GetMemoryManager());
	owndata = 0;
	return 0;
}

void RTPSources::SentRTPPacket()
{
	if (owndata == 0)
		return;

	bool prevsender = owndata->IsSender();
	
	owndata->SentRTPPacket();
	if (!prevsender && owndata->IsSender())
		sendercount++;
}

int RTPSources::ProcessRawPacket(RTPRawPacket *rawpack,RTPTransmitter *rtptrans,bool acceptownpackets)
{
	RTPTransmitter *transmitters[1];
	int num;
	
	transmitters[0] = rtptrans;
	if (rtptrans == 0)
		num = 0;
	else
		num = 1;
	return ProcessRawPacket(rawpack,transmitters,num,acceptownpackets);
}

int RTPSources::ProcessRawPacket(RTPRawPacket *rawpack,RTPTransmitter *rtptrans[],int numtrans,bool acceptownpackets)
{
	int status;
	
	if (rawpack->IsRTP()) // RTP packet
	{
		RTPPacket *rtppack;
		
		// First, we'll see if the packet can be parsed
		rtppack = RTPNew(GetMemoryManager(),RTPMEM_TYPE_CLASS_RTPPACKET) RTPPacket(*rawpack,GetMemoryManager());
		if (rtppack == 0)
			return ERR_RTP_OUTOFMEM;
		if ((status = rtppack->GetCreationError()) < 0)
		{
			if (status == ERR_RTP_PACKET_INVALIDPACKET)
			{
				RTPDelete(rtppack,GetMemoryManager());
				rtppack = 0;
			}
			else
			{
				RTPDelete(rtppack,GetMemoryManager());
				return status;
			}
		}
				
		// Check if the packet was valid
		if (rtppack != 0)
		{
			bool stored = false;
			bool ownpacket = false;
			int i;
			const RTPAddress *senderaddress = rawpack->GetSenderAddress();

			for (i = 0 ; !ownpacket && i < numtrans ; i++)
			{
				if (rtptrans[i]->ComesFromThisTransmitter(senderaddress))
					ownpacket = true;
			}
			
			// Check if the packet is our own.
			if (ownpacket)
			{
				// Now it depends on the user's preference
				// what to do with this packet:
				if (acceptownpackets)
				{
					// sender addres for own packets has to be NULL!
					if ((status = ProcessRTPPacket(rtppack,rawpack->GetReceiveTime(),0,&stored)) < 0)
					{
						if (!stored)
							RTPDelete(rtppack,GetMemoryManager());
						return status;
					}
				}
			}
			else 
			{
				if ((status = ProcessRTPPacket(rtppack,rawpack->GetReceiveTime(),senderaddress,&stored)) < 0)
				{
					if (!stored)
						RTPDelete(rtppack,GetMemoryManager());
					return status;
				}
			}
			if (!stored)
				RTPDelete(rtppack,GetMemoryManager());
		}
	}
	else // RTCP packet
	{
		RTCPCompoundPacket rtcpcomppack(*rawpack,GetMemoryManager());
		bool valid = false;
		
		if ((status = rtcpcomppack.GetCreationError()) < 0)
		{
			if (status != ERR_RTP_RTCPCOMPOUND_INVALIDPACKET)
				return status;
		}
		else
			valid = true;


		if (valid)
		{
			bool ownpacket = false;
			int i;
			const RTPAddress *senderaddress = rawpack->GetSenderAddress();

			for (i = 0 ; !ownpacket && i < numtrans ; i++)
			{
				if (rtptrans[i]->ComesFromThisTransmitter(senderaddress))
					ownpacket = true;
			}

			// First check if it's a packet of this session.
			if (ownpacket)
			{
				if (acceptownpackets)
				{
					// sender address for own packets has to be NULL
					status = ProcessRTCPCompoundPacket(&rtcpcomppack,rawpack->GetReceiveTime(),0);
					if (status < 0)
						return status;
				}
			}
			else // not our own packet
			{
				status = ProcessRTCPCompoundPacket(&rtcpcomppack,rawpack->GetReceiveTime(),rawpack->GetSenderAddress());
				if (status < 0)
					return status;
			}
		}
	}
	
	return 0;
}

int RTPSources::ProcessRTPPacket(RTPPacket *rtppack,const RTPTime &receivetime,const RTPAddress *senderaddress,bool *stored)
{
	uint32_t ssrc;
	RTPInternalSourceData *srcdat;
	int status;
	bool created;

	OnRTPPacket(rtppack,receivetime,senderaddress);

	*stored = false;
	
	ssrc = rtppack->GetSSRC();
	if ((status = ObtainSourceDataInstance(ssrc,&srcdat,&created)) < 0)
		return status;

	if (created)
	{
		if ((status = srcdat->SetRTPDataAddress(senderaddress)) < 0)
			return status;
	}
	else // got a previously existing source
	{
		if (CheckCollision(srcdat,senderaddress,true))
			return 0; // ignore packet on collision
	}
	
	bool prevsender = srcdat->IsSender();
	bool prevactive = srcdat->IsActive();
	
	// The packet comes from a valid source, we can process it further now
	// The following function should delete rtppack itself if something goes
	// wrong
	if ((status = srcdat->ProcessRTPPacket(rtppack,receivetime,stored)) < 0)
		return status;

	if (!prevsender && srcdat->IsSender())
		sendercount++;
	if (!prevactive && srcdat->IsActive())
		activecount++;

	if (created)
		OnNewSource(srcdat);

	if (srcdat->IsValidated()) // process the CSRCs
	{
		RTPInternalSourceData *csrcdat;
		bool createdcsrc;

		int num = rtppack->GetCSRCCount();
		int i;

		for (i = 0 ; i < num ; i++)
		{
			if ((status = ObtainSourceDataInstance(rtppack->GetCSRC(i),&csrcdat,&createdcsrc)) < 0)
				return status;
			if (createdcsrc)
			{
				csrcdat->SetCSRC();
				if (csrcdat->IsActive())
					activecount++;
				OnNewSource(csrcdat);
			}
			else // already found an entry, possibly because of RTCP data
			{
				if (!CheckCollision(csrcdat,senderaddress,true))
					csrcdat->SetCSRC();
			}
		}
	}
	
	return 0;
}

int RTPSources::ProcessRTCPCompoundPacket(RTCPCompoundPacket *rtcpcomppack,const RTPTime &receivetime,const RTPAddress *senderaddress)
{
	RTCPPacket *rtcppack;
	int status;
	bool gotownssrc = ((owndata == 0)?false:true);
	uint32_t ownssrc = ((owndata != 0)?owndata->GetSSRC():0);
	
	OnRTCPCompoundPacket(rtcpcomppack,receivetime,senderaddress);
	
	rtcpcomppack->GotoFirstPacket();	
	while ((rtcppack = rtcpcomppack->GetNextPacket()) != 0)
	{
		if (rtcppack->IsKnownFormat())
		{
			switch (rtcppack->GetPacketType())
			{
			case RTCPPacket::SR:
				{
					RTCPSRPacket *p = (RTCPSRPacket *)rtcppack;
					uint32_t senderssrc = p->GetSenderSSRC();
					
					status = ProcessRTCPSenderInfo(senderssrc,p->GetNTPTimestamp(),p->GetRTPTimestamp(),
						                       p->GetSenderPacketCount(),p->GetSenderOctetCount(),
								       receivetime,senderaddress);
					if (status < 0)
						return status;
					
					bool gotinfo = false;
					if (gotownssrc)
					{
						int i;
						int num = p->GetReceptionReportCount();
						for (i = 0 ; i < num ; i++)
						{
							if (p->GetSSRC(i) == ownssrc) // data is meant for us
							{
								gotinfo = true;
								status = ProcessRTCPReportBlock(senderssrc,p->GetFractionLost(i),p->GetLostPacketCount(i),
										                        p->GetExtendedHighestSequenceNumber(i),p->GetJitter(i),p->GetLSR(i),
													p->GetDLSR(i),receivetime,senderaddress);
								if (status < 0)
									return status;
							}
						}
					}
					if (!gotinfo)
					{
						status = UpdateReceiveTime(senderssrc,receivetime,senderaddress);
						if (status < 0)
							return status;
					}
				}
				break;
			case RTCPPacket::RR:
				{
					RTCPRRPacket *p = (RTCPRRPacket *)rtcppack;
					uint32_t senderssrc = p->GetSenderSSRC();
					
					bool gotinfo = false;

					if (gotownssrc)
					{
						int i;
						int num = p->GetReceptionReportCount();
						for (i = 0 ; i < num ; i++)
						{
							if (p->GetSSRC(i) == ownssrc)
							{
								gotinfo = true;
								status = ProcessRTCPReportBlock(senderssrc,p->GetFractionLost(i),p->GetLostPacketCount(i),
										                        p->GetExtendedHighestSequenceNumber(i),p->GetJitter(i),p->GetLSR(i),
													p->GetDLSR(i),receivetime,senderaddress);
								if (status < 0)
									return status;
							}
						}
					}
					if (!gotinfo)
					{
						status = UpdateReceiveTime(senderssrc,receivetime,senderaddress);
						if (status < 0)
							return status;
					}
				}
				break;
			case RTCPPacket::SDES:
				{
					RTCPSDESPacket *p = (RTCPSDESPacket *)rtcppack;
					
					if (p->GotoFirstChunk())
					{
						do
						{
							uint32_t sdesssrc = p->GetChunkSSRC();
							bool updated = false;
							if (p->GotoFirstItem())
							{
								do
								{
									RTCPSDESPacket::ItemType t;
				
									if ((t = p->GetItemType()) != RTCPSDESPacket::PRIV)
									{
										updated = true;
										status = ProcessSDESNormalItem(sdesssrc,t,p->GetItemLength(),p->GetItemData(),receivetime,senderaddress);
										if (status < 0)
											return status;
									}
#ifdef RTP_SUPPORT_SDESPRIV
									else
									{
										updated = true;
										status = ProcessSDESPrivateItem(sdesssrc,p->GetPRIVPrefixLength(),p->GetPRIVPrefixData(),p->GetPRIVValueLength(),