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/*
* rtp.cxx
*
* RTP protocol handler
*
* Open H323 Library
*
* Copyright (c) 1998-2000 Equivalence Pty. Ltd.
*
* The contents of this file are subject to the Mozilla Public License
* Version 1.0 (the "License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is Open H323 Library.
*
* The Initial Developer of the Original Code is Equivalence Pty. Ltd.
*
* Portions of this code were written with the assisance of funding from
* Vovida Networks, Inc. http://www.vovida.com.
*
* Contributor(s): ______________________________________.
*
* $Log: rtp.cxx,v $
* Revision 1.104 2005/11/21 21:06:23 shorne
* Added GQoS switches
*
* Revision 1.103 2005/08/27 02:06:01 csoutheren
* Keep track of time first RTP packet is received
*
* Revision 1.102 2005/01/16 20:39:44 csoutheren
* Fixed problem with IPv6 INADDR_ANY
*
* Revision 1.101 2005/01/04 08:08:46 csoutheren
* More changes to implement the new configuration methodology, and also to
* attack the global static problem
*
* Revision 1.100 2005/01/03 14:03:42 csoutheren
* Added new configure options and ability to disable/enable modules
*
* Revision 1.99 2005/01/03 06:26:09 csoutheren
* Added extensive support for disabling code modules at compile time
*
* Revision 1.98 2004/07/03 06:51:37 rjongbloed
* Added PTRACE_PARAM() macro to fix warnings on parameters used in PTRACE
* macros only.
*
* Revision 1.97 2004/05/02 18:49:08 ykiryanov
* Removed ifdef BeOS to add functionality
*
* Revision 1.96 2004/04/24 23:58:05 rjongbloed
* Fixed GCC 3.4 warning about PAssertNULL
*
* Revision 1.95 2004/04/22 12:38:04 rjongbloed
* Removed the RTP QoS class if there is no QoS support in build,
* thanks Nick Hoath, ISDN Communications Ltd.
*
* Revision 1.94 2004/04/07 05:31:43 csoutheren
* Added ability to receive calls from endpoints behind NAT firewalls
*
* Revision 1.93 2004/03/02 10:02:13 rjongbloed
* Added check for unusual error in reading UDP socket, thanks Michael Smith
*
* Revision 1.92 2004/02/09 11:17:50 rjongbloed
* Improved check for compound RTCP packets so does not possibly acess
* memory beyond that allocated in packet. Pointed out by Paul Slootman
*
* Revision 1.91 2003/10/28 22:35:21 dereksmithies
* Fix warning about possible use of unitialized variable.
*
* Revision 1.90 2003/10/27 06:03:39 csoutheren
* Added support for QoS
* Thanks to Henry Harrison of AliceStreet
*
* Revision 1.89 2003/10/09 09:47:45 csoutheren
* Fixed problem with re-opening RTP half-channels under unusual
* circumstances. Thanks to Damien Sandras
*
* Revision 1.88 2003/05/02 04:57:47 robertj
* Added header extension support to RTP data frame class.
*
* Revision 1.87 2003/02/07 00:30:21 robertj
* Changes for bizarre usage of RTP code outside of scope of H.323 specs.
*
* Revision 1.86 2003/02/04 23:50:06 robertj
* Changed trace log for RTP session creation to show local address.
*
* Revision 1.85 2003/02/04 07:06:42 robertj
* Added STUN support.
*
* Revision 1.84 2003/01/07 06:32:22 robertj
* Fixed faint possibility of getting an error on UDP write caused by ICMP
* unreachable being received when no UDP read is active on the socket. Then
* the UDP write gets the error stopping transmission.
*
* Revision 1.83 2002/11/19 01:48:00 robertj
* Allowed get/set of canonical anme and tool name.
*
* Revision 1.82 2002/11/05 03:32:04 robertj
* Added session ID to trace logs.
* Fixed possible extra wait exiting RTP read loop on close.
*
* Revision 1.81 2002/11/05 01:55:50 robertj
* Added comments about strange mutex usage.
*
* Revision 1.80 2002/10/31 00:47:07 robertj
* Enhanced jitter buffer system so operates dynamically between minimum and
* maximum values. Altered API to assure app writers note the change!
*
* Revision 1.79 2002/09/26 04:01:49 robertj
* Fixed calculation of fraction of packets lost in RR, thanks Awais Ali
*
* Revision 1.78 2002/09/03 06:15:32 robertj
* Added copy constructor/operator for session manager.
*
* Revision 1.77 2002/08/05 10:03:48 robertj
* Cosmetic changes to normalise the usage of pragma interface/implementation.
*
* Revision 1.76 2002/07/23 06:28:16 robertj
* Added statistics call back on first sent or received RTP packet, helps with,
* for example, detecting if remote endpoint has started to send audio.
*
* Revision 1.75 2002/05/28 02:37:55 robertj
* Fixed reading data out of RTCP compound statements.
*
* Revision 1.74 2002/05/21 07:12:39 robertj
* Fixed 100% CPU usage loop for checkin on sending RTCP data if
* have no RTP data transferred at all.
*
* Revision 1.73 2002/05/02 05:58:28 robertj
* Changed the mechanism for sending RTCP reports so that they will continue
* to be sent regardless of if there is any actual data traffic.
* Added support for compound RTCP statements for sender and receiver reports.
*
* Revision 1.72 2002/04/18 05:48:58 robertj
* Fixed problem with new SSRC value being ignored after RTP session has
* been restarted, thanks "Jacky".
*
* Revision 1.71 2002/02/09 02:33:49 robertj
* Improved payload type docuemntation and added Cisco CN.
*
* Revision 1.70 2001/12/20 04:34:56 robertj
* Fixed display of some of the unknown RTP types.
*
* Revision 1.69 2001/09/12 07:48:05 robertj
* Fixed various problems with tracing.
*
* Revision 1.68 2001/09/11 00:21:24 robertj
* Fixed missing stack sizes in endpoint for cleaner thread and jitter thread.
*
* Revision 1.67 2001/09/10 08:24:04 robertj
* Fixed setting of destination RTP address so works with endpoints that
* do not get the OLC packets quite right.
*
* Revision 1.66 2001/07/11 03:23:54 robertj
* Bug fixed where every 65536 PDUs the session thinks it is the first PDU again.
*
* Revision 1.65 2001/07/06 06:32:24 robertj
* Added flag and checks for RTP data having specific SSRC.
* Changed transmitter IP address check so is based on first received
* PDU instead of expecting it to come from the host we are sending to.
*
* Revision 1.64 2001/06/04 13:43:44 robertj
* Fixed I/O block breaker code if RTP session is bound to INADDR_ANY interface.
*
* Revision 1.63 2001/06/04 11:37:50 robertj
* Added thread safe enumeration functions of RTP sessions.
* Added member access functions to UDP based RTP sessions.
*
* Revision 1.62 2001/05/24 01:12:23 robertj
* Fixed sender report timestamp field, thanks Johan Gnosspelius
*
* Revision 1.61 2001/05/08 05:28:02 yurik
* No ifdef _WIN32_WCE anymore - 3+ version of SDK allows it
*
* Revision 1.60 2001/04/24 06:15:50 robertj
* Added work around for strange Cisco bug which suddenly starts sending
* RTP packets beginning at a difference sequence number base.
*
* Revision 1.59 2001/04/02 23:58:24 robertj
* Added jitter calculation to RTP session.
* Added trace of statistics.
*
* Revision 1.58 2001/03/20 07:24:05 robertj
* Changed RTP SDES to have simple host name instead of attempting a
* reverse DNS lookup on IP address as badly configured DNS can cause
* a 30 second delay before audio is sent.
*
* Revision 1.57 2001/03/15 05:45:45 robertj
* Changed, yet again, the setting of RTP info to allow for Cisco idosyncracies.
*
* Revision 1.56 2001/02/21 08:08:26 robertj
* Added more debugging.
*
* Revision 1.55 2001/02/09 05:13:56 craigs
* Added pragma implementation to (hopefully) reduce the executable image size
* under Linux
*
* Revision 1.54 2001/01/28 07:06:59 yurik
* WinCE-port - avoid using of IP_TOS
*
* Revision 1.53 2000/12/18 08:59:20 craigs
* Added ability to set ports
*
* Revision 1.52 2000/09/25 22:27:40 robertj
* Fixed uninitialised variable for lastRRSequenceNumber
*
* Revision 1.51 2000/09/25 01:53:20 robertj
* Fixed MSVC warnings.
*
* Revision 1.50 2000/09/25 01:44:13 robertj
* Fixed possible race condition on shutdown of RTP session with jitter buffer.
*
* Revision 1.49 2000/09/22 00:32:34 craigs
* Added extra logging
* Fixed problems with no fastConnect with tunelling
*
* Revision 1.48 2000/09/21 02:06:07 craigs
* Added handling for endpoints that return conformant, but useless, RTP address
* and port numbers
*
* Revision 1.47 2000/08/17 00:42:39 robertj
* Fixed RTP Goodbye message reason string parsing, thanks Thien Nguyen.
*
* Revision 1.46 2000/05/30 10:35:41 robertj
* Fixed GNU compiler warning.
*
* Revision 1.45 2000/05/30 06:52:26 robertj
* Fixed problem with Cisco restarting sequence numbers when changing H.323 logical channels.
*
* Revision 1.44 2000/05/23 12:57:37 robertj
* Added ability to change IP Type Of Service code from applications.
*
* Revision 1.43 2000/05/12 00:27:35 robertj
* Fixed bug in UseSession() that caused asserts on BSD and possible race condition everywhere.
*
* Revision 1.42 2000/05/04 11:52:35 robertj
* Added Packets Too Late statistics, requiring major rearrangement of jitter
* buffer code, not also changes semantics of codec Write() function slightly.
*
* Revision 1.41 2000/05/02 04:32:27 robertj
* Fixed copyright notice comment.
*
* Revision 1.40 2000/05/01 01:01:49 robertj
* Added flag for what to do with out of orer packets (use if jitter, don't if not).
*
* Revision 1.39 2000/04/30 03:55:09 robertj
* Improved the RTCP messages, epecially reports
*
* Revision 1.38 2000/04/28 12:56:39 robertj
* Fixed transmission of SDES record in RTCP channel.
*
* Revision 1.37 2000/04/19 01:50:05 robertj
* Improved debugging messages.
*
* Revision 1.36 2000/04/13 18:07:39 robertj
* Fixed missing mutex release causing possible deadlocks.
*
* Revision 1.35 2000/04/10 17:40:05 robertj
* Fixed debug output of RTP payload types to allow for unknown numbers.
*
* Revision 1.34 2000/04/05 04:09:24 robertj
* Fixed portability problem with max() macro.
*
* Revision 1.33 2000/04/05 03:17:32 robertj
* Added more RTP statistics gathering and H.245 round trip delay calculation.
*
* Revision 1.32 2000/04/03 18:15:44 robertj
* Added "fractional" part of RTCP status NTP timestamp field.
*
* Revision 1.31 2000/03/23 02:54:57 robertj
* Added sending of SDES control packets.
*
* Revision 1.30 2000/03/20 20:53:42 robertj
* Fixed problem with being able to reopen for reading an RTP_Session (Cisco compatibilty)
*
* Revision 1.29 2000/03/04 12:32:23 robertj
* Added setting of TOS field in IP header to get poor mans QoS on some routers.
*
* Revision 1.28 2000/02/29 13:00:13 robertj
* Added extra statistic display for RTP packets out of order.
*
* Revision 1.27 2000/02/29 02:13:56 robertj
* Fixed RTP receive of both control and data, ignores ECONNRESET/ECONNREFUSED errors.
*
* Revision 1.26 2000/02/27 10:56:24 robertj
* Fixed error in code allowing non-consecutive RTP port numbers coming from broken stacks, thanks Vassili Leonov.
*
* Revision 1.25 2000/02/17 12:07:44 robertj
* Used ne wPWLib random number generator after finding major problem in MSVC rand().
*
* Revision 1.24 2000/01/29 07:10:20 robertj
* Fixed problem with RTP transmit to host that is not yet ready causing the
* receive side to die with ECONNRESET, thanks Ian MacDonald
*
* Revision 1.23 2000/01/20 05:57:46 robertj
* Added extra flexibility in receiving incorrectly formed OpenLogicalChannel PDU's
*
* Revision 1.22 2000/01/14 00:31:40 robertj
* Bug fix for RTP port allocation (MSVC optimised version), Thanks to Ian MacDonald.
*
* Revision 1.21 1999/12/30 09:14:49 robertj
* Changed payload type functions to use enum.
*
* Revision 1.20 1999/12/23 23:02:36 robertj
* File reorganision for separating RTP from H.323 and creation of LID for VPB support.
*
* Revision 1.19 1999/11/29 04:50:11 robertj
* Added adaptive threshold calculation to silence detection.
*
* Revision 1.18 1999/11/22 00:09:59 robertj
* Fixed error in RTP transmit rewrite for ternary state, didn't transmit at all!
*
* Revision 1.17 1999/11/20 05:35:48 robertj
* Fixed possibly I/O block in RTP read loops.
*
* Revision 1.16 1999/11/19 13:13:31 robertj
* Fixed Windows 95 compatibility issue in shutdown of RTP reading.
*
* Revision 1.15 1999/11/19 10:23:16 robertj
* Fixed local binding of socket to correct address on multi-homes systems.
*
* Revision 1.14 1999/11/19 09:17:15 robertj
* Fixed problems with aycnhronous shut down of logical channels.
*
* Revision 1.13 1999/11/17 03:49:51 robertj
* Added RTP statistics display.
*
* Revision 1.12 1999/11/14 11:41:07 robertj
* Added access functions to RTP statistics.
*
* Revision 1.11 1999/10/18 23:55:11 robertj
* Fixed bug in setting contributing sources, length put into wrong spot in PDU header
*
* Revision 1.10 1999/09/21 14:10:04 robertj
* Removed warnings when no tracing enabled.
*
* Revision 1.9 1999/09/05 00:58:37 robertj
* Removed requirement that OpenLogicalChannalAck sessionId match original OLC.
*
* Revision 1.8 1999/09/03 02:17:50 robertj
* Added more debugging
*
* Revision 1.7 1999/08/31 12:34:19 robertj
* Added gatekeeper support.
*
* Revision 1.6 1999/07/16 02:13:54 robertj
* Slowed down the control channel statistics packets.
*
* Revision 1.5 1999/07/13 09:53:24 robertj
* Fixed some problems with jitter buffer and added more debugging.
*
* Revision 1.4 1999/07/09 06:09:52 robertj
* Major implementation. An ENORMOUS amount of stuff added everywhere.
*
* Revision 1.3 1999/06/22 13:49:40 robertj
* Added GSM support and further RTP protocol enhancements.
*
* Revision 1.2 1999/06/14 08:42:52 robertj
* Fixed bug in dropped packets display was negative.
*
* Revision 1.1 1999/06/14 06:12:25 robertj
* Changes for using RTP sessions correctly in H323 Logical Channel context
*
*/
#include <ptlib.h>
#ifdef __GNUC__
#pragma implementation "rtp.h"
#endif
#include "rtp.h"
#ifndef NO_H323_AUDIO_CODECS
#include "jitter.h"
#endif
#include <ptclib/random.h>
#ifdef P_STUN
#include <ptclib/pstun.h>
#endif
#define new PNEW
const unsigned SecondsFrom1900to1970 = (70*365+17)*24*60*60U;
#define UDP_BUFFER_SIZE 32768
#define MIN_HEADER_SIZE 12
/////////////////////////////////////////////////////////////////////////////
RTP_DataFrame::RTP_DataFrame(PINDEX sz)
: PBYTEArray(MIN_HEADER_SIZE+sz)
{
payloadSize = sz;
theArray[0] = '\x80';
}
void RTP_DataFrame::SetExtension(BOOL ext)
{
if (ext)
theArray[0] |= 0x10;
else
theArray[0] &= 0xef;
}
void RTP_DataFrame::SetMarker(BOOL m)
{
if (m)
theArray[1] |= 0x80;
else
theArray[1] &= 0x7f;
}
void RTP_DataFrame::SetPayloadType(PayloadTypes t)
{
PAssert(t <= 0x7f, PInvalidParameter);
theArray[1] &= 0x80;
theArray[1] |= t;
}
DWORD RTP_DataFrame::GetContribSource(PINDEX idx) const
{
PAssert(idx < GetContribSrcCount(), PInvalidParameter);
return ((PUInt32b *)&theArray[MIN_HEADER_SIZE])[idx];
}
void RTP_DataFrame::SetContribSource(PINDEX idx, DWORD src)
{
PAssert(idx <= 15, PInvalidParameter);
if (idx >= GetContribSrcCount()) {
BYTE * oldPayload = GetPayloadPtr();
theArray[0] &= 0xf0;
theArray[0] |= idx+1;
SetSize(GetHeaderSize()+payloadSize);
memmove(GetPayloadPtr(), oldPayload, payloadSize);
}
((PUInt32b *)&theArray[MIN_HEADER_SIZE])[idx] = src;
}
PINDEX RTP_DataFrame::GetHeaderSize() const
{
PINDEX sz = MIN_HEADER_SIZE + 4*GetContribSrcCount();
if (GetExtension())
sz += 4 + GetExtensionSize();
return sz;
}
int RTP_DataFrame::GetExtensionType() const
{
if (GetExtension())
return *(PUInt16b *)&theArray[MIN_HEADER_SIZE + 4*GetContribSrcCount()];
return -1;
}
void RTP_DataFrame::SetExtensionType(int type)
{
if (type < 0)
SetExtension(FALSE);
else {
if (!GetExtension())
SetExtensionSize(0);
*(PUInt16b *)&theArray[MIN_HEADER_SIZE + 4*GetContribSrcCount()] = (WORD)type;
}
}
PINDEX RTP_DataFrame::GetExtensionSize() const
{
if (GetExtension())
return *(PUInt16b *)&theArray[MIN_HEADER_SIZE + 4*GetContribSrcCount() + 2];
return 0;
}
BOOL RTP_DataFrame::SetExtensionSize(PINDEX sz)
{
if (!SetMinSize(MIN_HEADER_SIZE + 4*GetContribSrcCount() + 4+4*sz + payloadSize))
return FALSE;
SetExtension(TRUE);
*(PUInt16b *)&theArray[MIN_HEADER_SIZE + 4*GetContribSrcCount() + 2] = (WORD)sz;
return TRUE;
}
BYTE * RTP_DataFrame::GetExtensionPtr() const
{
if (GetExtension())
return (BYTE *)&theArray[MIN_HEADER_SIZE + 4*GetContribSrcCount() + 4];
return NULL;
}
BOOL RTP_DataFrame::SetPayloadSize(PINDEX sz)
{
payloadSize = sz;
return SetMinSize(GetHeaderSize()+payloadSize);
}
#if PTRACING
static const char * const PayloadTypesNames[RTP_DataFrame::LastKnownPayloadType] = {
"PCMU",
"FS1016",
"G721",
"GSM",
"G7231",
"DVI4_8k",
"DVI4_16k",
"LPC",
"PCMA",
"G722",
"L16_Stereo",
"L16_Mono",
"G723",
"CN",
"MPA",
"G728",
"DVI4_11k",
"DVI4_22k",
"G729",
"CiscoCN",
NULL, NULL, NULL, NULL, NULL,
"CelB",
"JPEG",
NULL, NULL, NULL, NULL,
"H261",
"MPV",
"MP2T",
"H263"
};
ostream & operator<<(ostream & o, RTP_DataFrame::PayloadTypes t)
{
if ((PINDEX)t < PARRAYSIZE(PayloadTypesNames) && PayloadTypesNames[t] != NULL)
o << PayloadTypesNames[t];
else
o << "[pt=" << (int)t << ']';
return o;
}
#endif
/////////////////////////////////////////////////////////////////////////////
RTP_ControlFrame::RTP_ControlFrame(PINDEX sz)
: PBYTEArray(sz)
{
compoundOffset = 0;
compoundSize = 0;
theArray[0] = '\x80'; // Set version 2
}
void RTP_ControlFrame::SetCount(unsigned count)
{
PAssert(count < 32, PInvalidParameter);
theArray[compoundOffset] &= 0xe0;
theArray[compoundOffset] |= count;
}
void RTP_ControlFrame::SetPayloadType(unsigned t)
{
PAssert(t < 256, PInvalidParameter);
theArray[compoundOffset+1] = (BYTE)t;
}
void RTP_ControlFrame::SetPayloadSize(PINDEX sz)
{
sz = (sz+3)/4;
PAssert(sz <= 0xffff, PInvalidParameter);
compoundSize = compoundOffset+4*(sz+1);
SetMinSize(compoundSize+1);
*(PUInt16b *)&theArray[compoundOffset+2] = (WORD)sz;
}
BOOL RTP_ControlFrame::ReadNextCompound()
{
compoundOffset += GetPayloadSize()+4;
if (compoundOffset+4 > GetSize())
return FALSE;
return compoundOffset+GetPayloadSize()+4 <= GetSize();
}
BOOL RTP_ControlFrame::WriteNextCompound()
{
compoundOffset += GetPayloadSize()+4;
if (!SetMinSize(compoundOffset+4))
return FALSE;
theArray[compoundOffset] = '\x80'; // Set version 2
theArray[compoundOffset+1] = 0; // Set payload type to illegal
theArray[compoundOffset+2] = 0; // Set payload size to zero
theArray[compoundOffset+3] = 0;
return TRUE;
}
RTP_ControlFrame::SourceDescription & RTP_ControlFrame::AddSourceDescription(DWORD src)
{
SetPayloadType(RTP_ControlFrame::e_SourceDescription);
PINDEX index = GetCount();
SetCount(index+1);
PINDEX originalPayloadSize = index != 0 ? GetPayloadSize() : 0;
SetPayloadSize(originalPayloadSize+sizeof(SourceDescription));
SourceDescription & sdes = *(SourceDescription *)(GetPayloadPtr()+originalPayloadSize);
sdes.src = src;
sdes.item[0].type = e_END;
return sdes;
}
RTP_ControlFrame::SourceDescription::Item &
RTP_ControlFrame::AddSourceDescriptionItem(SourceDescription & sdes,
unsigned type,
const PString & data)
{
PINDEX dataLength = data.GetLength();
SetPayloadSize(GetPayloadSize()+sizeof(SourceDescription::Item)+dataLength-1);
SourceDescription::Item * item = sdes.item;
while (item->type != e_END)
item = item->GetNextItem();
item->type = (BYTE)type;
item->length = (BYTE)dataLength;
memcpy(item->data, (const char *)data, item->length);
item->GetNextItem()->type = e_END;
return *item;
}
void RTP_ControlFrame::ReceiverReport::SetLostPackets(unsigned packets)
{
lost[0] = (BYTE)(packets >> 16);
lost[1] = (BYTE)(packets >> 8);
lost[2] = (BYTE)packets;
}
/////////////////////////////////////////////////////////////////////////////
void RTP_UserData::OnTxStatistics(const RTP_Session & /*session*/) const
{
}
void RTP_UserData::OnRxStatistics(const RTP_Session & /*session*/) const
{
}
/////////////////////////////////////////////////////////////////////////////
RTP_Session::RTP_Session(unsigned id, RTP_UserData * data)
: canonicalName(PProcess::Current().GetUserName()),
toolName(PProcess::Current().GetName()),
reportTimeInterval(0, 12), // Seconds
firstDataReceivedTime(0),
reportTimer(reportTimeInterval)
{
PAssert(id > 0 && id < 256, PInvalidParameter);
sessionID = (BYTE)id;
referenceCount = 1;
userData = data;
#ifndef NO_H323_AUDIO_CODECS
jitter = NULL;
#endif
ignoreOtherSources = TRUE;
ignoreOutOfOrderPackets = TRUE;
syncSourceOut = PRandom::Number();
syncSourceIn = 0;
txStatisticsInterval = 100; // Number of data packets between tx reports
rxStatisticsInterval = 100; // Number of data packets between rx reports
lastSentSequenceNumber = (WORD)PRandom::Number();
expectedSequenceNumber = 0;
lastRRSequenceNumber = 0;
consecutiveOutOfOrderPackets = 0;
packetsSent = 0;
octetsSent = 0;
packetsReceived = 0;
octetsReceived = 0;
packetsLost = 0;
packetsOutOfOrder = 0;
averageSendTime = 0;
maximumSendTime = 0;
minimumSendTime = 0;
averageReceiveTime = 0;
maximumReceiveTime = 0;
minimumReceiveTime = 0;
jitterLevel = 0;
maximumJitterLevel = 0;
txStatisticsCount = 0;
rxStatisticsCount = 0;
averageSendTimeAccum = 0;
maximumSendTimeAccum = 0;
minimumSendTimeAccum = 0xffffffff;
averageReceiveTimeAccum = 0;
maximumReceiveTimeAccum = 0;
minimumReceiveTimeAccum = 0xffffffff;
packetsLostSinceLastRR = 0;
lastTransitTime = 0;
}
RTP_Session::~RTP_Session()
{
PTRACE_IF(2, packetsSent != 0 || packetsReceived != 0,
"RTP\tFinal statistics:\n"
" packetsSent = " << packetsSent << "\n"
" octetsSent = " << octetsSent << "\n"
" averageSendTime = " << averageSendTime << "\n"
" maximumSendTime = " << maximumSendTime << "\n"
" minimumSendTime = " << minimumSendTime << "\n"
" packetsReceived = " << packetsReceived << "\n"
" octetsReceived = " << octetsReceived << "\n"
" packetsLost = " << packetsLost << "\n"
" packetsTooLate = " << GetPacketsTooLate() << "\n"
" packetsOutOfOrder = " << packetsOutOfOrder << "\n"
" averageReceiveTime= " << averageReceiveTime << "\n"
" maximumReceiveTime= " << maximumReceiveTime << "\n"
" minimumReceiveTime= " << minimumReceiveTime << "\n"
" averageJitter = " << (jitterLevel >> 7) << "\n"
" maximumJitter = " << (maximumJitterLevel >> 7)
);
delete userData;
#ifndef NO_H323_AUDIO_CODECS
delete jitter;
#endif
}
PString RTP_Session::GetCanonicalName() const
{
PWaitAndSignal mutex(reportMutex);
PString s = canonicalName;
s.MakeUnique();
return s;
}
void RTP_Session::SetCanonicalName(const PString & name)
{
PWaitAndSignal mutex(reportMutex);
canonicalName = name;
}
PString RTP_Session::GetToolName() const
{
PWaitAndSignal mutex(reportMutex);
PString s = toolName;
s.MakeUnique();
return s;
}
void RTP_Session::SetToolName(const PString & name)
{
PWaitAndSignal mutex(reportMutex);
toolName = name;
}
void RTP_Session::SetUserData(RTP_UserData * data)
{
delete userData;
userData = data;
}
void RTP_Session::SetJitterBufferSize(unsigned minJitterDelay,
unsigned maxJitterDelay,
PINDEX stackSize)
{
if (minJitterDelay == 0 && maxJitterDelay == 0) {
#ifndef NO_H323_AUDIO_CODECS
delete jitter;
jitter = NULL;
#endif
}
else if (jitter != NULL) {
#ifndef NO_H323_AUDIO_CODECS
jitter->SetDelay(minJitterDelay, maxJitterDelay);
#endif
}
else {
SetIgnoreOutOfOrderPackets(FALSE);
#ifndef NO_H323_AUDIO_CODECS
jitter = new RTP_JitterBuffer(*this, minJitterDelay, maxJitterDelay, stackSize);
#endif
}
}
unsigned RTP_Session::GetJitterBufferSize() const
{
return
#ifndef NO_H323_AUDIO_CODECS
jitter != NULL ? jitter->GetJitterTime() :
#endif
0;
}
BOOL RTP_Session::ReadBufferedData(DWORD timestamp, RTP_DataFrame & frame)
{
#ifndef NO_H323_AUDIO_CODECS
if (jitter != NULL)
return jitter->ReadData(timestamp, frame);
else
#endif
return ReadData(frame);
}
void RTP_Session::SetTxStatisticsInterval(unsigned packets)
{
txStatisticsInterval = PMAX(packets, 2);
txStatisticsCount = 0;
averageSendTimeAccum = 0;
maximumSendTimeAccum = 0;
minimumSendTimeAccum = 0xffffffff;
}
void RTP_Session::SetRxStatisticsInterval(unsigned packets)
{
rxStatisticsInterval = PMAX(packets, 2);
rxStatisticsCount = 0;
averageReceiveTimeAccum = 0;
maximumReceiveTimeAccum = 0;
minimumReceiveTimeAccum = 0xffffffff;
}
void RTP_Session::AddReceiverReport(RTP_ControlFrame::ReceiverReport & receiver)
{
receiver.ssrc = syncSourceIn;
receiver.SetLostPackets(packetsLost);
if (expectedSequenceNumber > lastRRSequenceNumber)
receiver.fraction = (BYTE)((packetsLostSinceLastRR<<8)/(expectedSequenceNumber - lastRRSequenceNumber));
else
receiver.fraction = 0;
packetsLostSinceLastRR = 0;
receiver.last_seq = lastRRSequenceNumber;
lastRRSequenceNumber = expectedSequenceNumber;
receiver.jitter = jitterLevel >> 4; // Allow for rounding protection bits
// The following have not been calculated yet.
receiver.lsr = 0;
receiver.dlsr = 0;
PTRACE(3, "RTP\tSentReceiverReport:"
" ssrc=" << receiver.ssrc
<< " fraction=" << (unsigned)receiver.fraction
<< " lost=" << receiver.GetLostPackets()
<< " last_seq=" << receiver.last_seq
<< " jitter=" << receiver.jitter
<< " lsr=" << receiver.lsr
<< " dlsr=" << receiver.dlsr);
}
RTP_Session::SendReceiveStatus RTP_Session::OnSendData(RTP_DataFrame & frame)
{
PTimeInterval tick = PTimer::Tick(); // Timestamp set now
frame.SetSequenceNumber(++lastSentSequenceNumber);
frame.SetSyncSource(syncSourceOut);
if (packetsSent != 0 && !frame.GetMarker()) {
// Only do statistics on subsequent packets
DWORD diff = (tick - lastSentPacketTime).GetInterval();
averageSendTimeAccum += diff;
if (diff > maximumSendTimeAccum)
maximumSendTimeAccum = diff;
if (diff < minimumSendTimeAccum)
minimumSendTimeAccum = diff;
txStatisticsCount++;
}
lastSentTimestamp = frame.GetTimestamp();
lastSentPacketTime = tick;
octetsSent += frame.GetPayloadSize();
packetsSent++;
// Call the statistics call-back on the first PDU with total count == 1
if (packetsSent == 1 && userData != NULL)
userData->OnTxStatistics(*this);
if (!SendReport())
return e_AbortTransport;
if (txStatisticsCount < txStatisticsInterval)
return e_ProcessPacket;
txStatisticsCount = 0;
averageSendTime = averageSendTimeAccum/txStatisticsInterval;
maximumSendTime = maximumSendTimeAccum;
minimumSendTime = minimumSendTimeAccum;
averageSendTimeAccum = 0;
maximumSendTimeAccum = 0;
minimumSendTimeAccum = 0xffffffff;
PTRACE(2, "RTP\tTransmit statistics: "
" packets=" << packetsSent <<
" octets=" << octetsSent <<
" avgTime=" << averageSendTime <<
" maxTime=" << maximumSendTime <<
" minTime=" << minimumSendTime
);
if (userData != NULL)
userData->OnTxStatistics(*this);
return e_ProcessPacket;
}
RTP_Session::SendReceiveStatus RTP_Session::OnReceiveData(const RTP_DataFrame & frame)
{
// Check that the PDU is the right version
if (frame.GetVersion() != RTP_DataFrame::ProtocolVersion)
return e_IgnorePacket; // Non fatal error, just ignore
// Check for if a control packet rather than data packet.
if (frame.GetPayloadType() > RTP_DataFrame::MaxPayloadType)
return e_IgnorePacket; // Non fatal error, just ignore
PTimeInterval tick = PTimer::Tick(); // Get timestamp now
// Have not got SSRC yet, so grab it now
if (syncSourceIn == 0)
syncSourceIn = frame.GetSyncSource();
// Check packet sequence numbers
if (packetsReceived == 0) {
expectedSequenceNumber = (WORD)(frame.GetSequenceNumber() + 1);
firstDataReceivedTime = PTime();
PTRACE(2, "RTP\tFirst data:"
" ver=" << frame.GetVersion()
<< " pt=" << frame.GetPayloadType()
<< " psz=" << frame.GetPayloadSize()
<< " m=" << frame.GetMarker()
<< " x=" << frame.GetExtension()
<< " seq=" << frame.GetSequenceNumber()
<< " ts=" << frame.GetTimestamp()
<< " src=" << frame.GetSyncSource()
<< " ccnt=" << frame.GetContribSrcCount());
}
else {
if (ignoreOtherSources && frame.GetSyncSource() != syncSourceIn) {
PTRACE(2, "RTP\tPacket from SSRC=" << frame.GetSyncSource()
<< " ignored, expecting SSRC=" << syncSourceIn);
return e_IgnorePacket; // Non fatal error, just ignore
}
WORD sequenceNumber = frame.GetSequenceNumber();
if (sequenceNumber == expectedSequenceNumber) {
expectedSequenceNumber++;
consecutiveOutOfOrderPackets = 0;
// Only do statistics on packets after first received in talk burst
if (!frame.GetMarker()) {
DWORD diff = (tick - lastReceivedPacketTime).GetInterval();
averageReceiveTimeAccum += diff;
if (diff > maximumReceiveTimeAccum)
maximumReceiveTimeAccum = diff;
if (diff < minimumReceiveTimeAccum)
minimumReceiveTimeAccum = diff;
rxStatisticsCount++;
// The following has the implicit assumption that something that has jitter
// is an audio codec and thus is in 8kHz timestamp units.
diff *= 8;
long variance = diff - lastTransitTime;
lastTransitTime = diff;
if (variance < 0)
variance = -variance;
jitterLevel += variance - ((jitterLevel+8) >> 4);
if (jitterLevel > maximumJitterLevel)
maximumJitterLevel = jitterLevel;
}
}
else if (sequenceNumber < expectedSequenceNumber) {
PTRACE(3, "RTP\tOut of order packet, received "
<< sequenceNumber << " expected " << expectedSequenceNumber
<< " ssrc=" << syncSourceIn);
packetsOutOfOrder++;
// Check for Cisco bug where sequence numbers suddenly start incrementing
// from a different base.
if (++consecutiveOutOfOrderPackets > 10) {
expectedSequenceNumber = (WORD)(sequenceNumber + 1);
PTRACE(1, "RTP\tAbnormal change of sequence numbers, adjusting to expect "
<< expectedSequenceNumber << " ssrc=" << syncSourceIn);
}
if (ignoreOutOfOrderPackets)
return e_IgnorePacket; // Non fatal error, just ignore
}
else {
unsigned dropped = sequenceNumber - expectedSequenceNumber;
packetsLost += dropped;
packetsLostSinceLastRR += dropped;
PTRACE(3, "RTP\tDropped " << dropped << " packet(s) at " << sequenceNumber
<< ", ssrc=" << syncSourceIn);
expectedSequenceNumber = (WORD)(sequenceNumber + 1);
consecutiveOutOfOrderPackets = 0;
}
}
lastReceivedPacketTime = tick;
octetsReceived += frame.GetPayloadSize();
packetsReceived++;
// Call the statistics call-back on the first PDU with total count == 1
if (packetsReceived == 1 && userData != NULL)
userData->OnRxStatistics(*this);
if (!SendReport())
return e_AbortTransport;
if (rxStatisticsCount < rxStatisticsInterval)
return e_ProcessPacket;
rxStatisticsCount = 0;
averageReceiveTime = averageReceiveTimeAccum/rxStatisticsInterval;
maximumReceiveTime = maximumReceiveTimeAccum;
minimumReceiveTime = minimumReceiveTimeAccum;
averageReceiveTimeAccum = 0;
maximumReceiveTimeAccum = 0;
minimumReceiveTimeAccum = 0xffffffff;
PTRACE(2, "RTP\tReceive statistics: "
" packets=" << packetsReceived <<
" octets=" << octetsReceived <<
" lost=" << packetsLost <<
" tooLate=" << GetPacketsTooLate() <<
" order=" << packetsOutOfOrder <<
" avgTime=" << averageReceiveTime <<
" maxTime=" << maximumReceiveTime <<
" minTime=" << minimumReceiveTime <<
" jitter=" << (jitterLevel >> 7) <<
" maxJitter=" << (maximumJitterLevel >> 7)
);
if (userData != NULL)
userData->OnRxStatistics(*this);
return e_ProcessPacket;
}
BOOL RTP_Session::SendReport()
{
PWaitAndSignal mutex(reportMutex);
if (reportTimer.IsRunning())
return TRUE;
// Have not got anything yet, do nothing
if (packetsSent == 0 && packetsReceived == 0) {
reportTimer = reportTimeInterval;
return TRUE;
}
RTP_ControlFrame report;
// No packets sent yet, so only send RR
if (packetsSent == 0) {
// Send RR as we are not transmitting
report.SetPayloadType(RTP_ControlFrame::e_ReceiverReport);
report.SetPayloadSize(4+sizeof(RTP_ControlFrame::ReceiverReport));
report.SetCount(1);
PUInt32b * payload = (PUInt32b *)report.GetPayloadPtr();
*payload = syncSourceOut;
AddReceiverReport(*(RTP_ControlFrame::ReceiverReport *)&payload[1]);
}
else {
report.SetPayloadType(RTP_ControlFrame::e_SenderReport);
report.SetPayloadSize(sizeof(RTP_ControlFrame::SenderReport));
RTP_ControlFrame::SenderReport * sender =
(RTP_ControlFrame::SenderReport *)report.GetPayloadPtr();
sender->ssrc = syncSourceOut;
PTime now;
sender->ntp_sec = now.GetTimeInSeconds()+SecondsFrom1900to1970; // Convert from 1970 to 1900
sender->ntp_frac = now.GetMicrosecond()*4294; // Scale microseconds to "fraction" from 0 to 2^32
sender->rtp_ts = lastSentTimestamp;
sender->psent = packetsSent;
sender->osent = octetsSent;
PTRACE(3, "RTP\tSentSenderReport: "
" ssrc=" << sender->ssrc
<< " ntp=" << sender->ntp_sec << '.' << sender->ntp_frac
<< " rtp=" << sender->rtp_ts
<< " psent=" << sender->psent
<< " osent=" << sender->osent);
if (syncSourceIn != 0) {
report.SetPayloadSize(sizeof(RTP_ControlFrame::SenderReport) +
sizeof(RTP_ControlFrame::ReceiverReport));
report.SetCount(1);
AddReceiverReport(*(RTP_ControlFrame::ReceiverReport *)&sender[1]);
}
}
// Add the SDES part to compound RTCP packet
PTRACE(2, "RTP\tSending SDES: " << canonicalName);
report.WriteNextCompound();
RTP_ControlFrame::SourceDescription & sdes = report.AddSourceDescription(syncSourceOut);
report.AddSourceDescriptionItem(sdes, RTP_ControlFrame::e_CNAME, canonicalName);
report.AddSourceDescriptionItem(sdes, RTP_ControlFrame::e_TOOL, toolName);
// Wait a fuzzy amount of time so things don't get into lock step
int interval = (int)reportTimeInterval.GetMilliSeconds();
int third = interval/3;
interval += PRandom::Number()%(2*third);
interval -= third;
reportTimer = interval;
return WriteControl(report);
}
static RTP_Session::ReceiverReportArray
BuildReceiverReportArray(const RTP_ControlFrame & frame, PINDEX offset)
{
RTP_Session::ReceiverReportArray reports;
const RTP_ControlFrame::ReceiverReport * rr = (const RTP_ControlFrame::ReceiverReport *)(frame.GetPayloadPtr()+offset);
for (PINDEX repIdx = 0; repIdx < (PINDEX)frame.GetCount(); repIdx++) {
RTP_Session::ReceiverReport * report = new RTP_Session::ReceiverReport;
report->sourceIdentifier = rr->ssrc;
report->fractionLost = rr->fraction;
report->totalLost = rr->GetLostPackets();
report->lastSequenceNumber = rr->last_seq;
report->jitter = rr->jitter;
report->lastTimestamp = (PInt64)(DWORD)rr->lsr;
report->delay = ((PInt64)rr->dlsr << 16)/1000;
reports.SetAt(repIdx, report);
rr++;
}
return reports;
}
RTP_Session::SendReceiveStatus RTP_Session::OnReceiveControl(RTP_ControlFrame & frame)
{
do {
BYTE * payload = frame.GetPayloadPtr();
unsigned size = frame.GetPayloadSize();
switch (frame.GetPayloadType()) {
case RTP_ControlFrame::e_SenderReport :
if (size >= sizeof(RTP_ControlFrame::SenderReport)) {
SenderReport sender;
const RTP_ControlFrame::SenderReport & sr = *(const RTP_ControlFrame::SenderReport *)payload;
sender.sourceIdentifier = sr.ssrc;
sender.realTimestamp = PTime(sr.ntp_sec-SecondsFrom1900to1970, sr.ntp_frac/4294);
sender.rtpTimestamp = sr.rtp_ts;
sender.packetsSent = sr.psent;
sender.octetsSent = sr.osent;
OnRxSenderReport(sender,
BuildReceiverReportArray(frame, sizeof(RTP_ControlFrame::SenderReport)));
}
else {
PTRACE(2, "RTP\tSenderReport packet truncated");
}
break;
case RTP_ControlFrame::e_ReceiverReport :
if (size >= 4)
OnRxReceiverReport(*(const PUInt32b *)payload,
BuildReceiverReportArray(frame, sizeof(PUInt32b)));
else {
PTRACE(2, "RTP\tReceiverReport packet truncated");
}
break;
case RTP_ControlFrame::e_SourceDescription :
if (size >= frame.GetCount()*sizeof(RTP_ControlFrame::SourceDescription)) {
SourceDescriptionArray descriptions;
const RTP_ControlFrame::SourceDescription * sdes = (const RTP_ControlFrame::SourceDescription *)payload;
for (PINDEX srcIdx = 0; srcIdx < (PINDEX)frame.GetCount(); srcIdx++) {
descriptions.SetAt(srcIdx, new SourceDescription(sdes->src));
const RTP_ControlFrame::SourceDescription::Item * item = sdes->item;
while (item->type != RTP_ControlFrame::e_END) {
descriptions[srcIdx].items.SetAt(item->type, PString(item->data, item->length));
item = item->GetNextItem();
}
sdes = (const RTP_ControlFrame::SourceDescription *)item->GetNextItem();
}
OnRxSourceDescription(descriptions);
}
else {
PTRACE(2, "RTP\tSourceDescription packet truncated");
}
break;
case RTP_ControlFrame::e_Goodbye :
if (size >= 4) {
PString str;
unsigned count = frame.GetCount()*4;
if (size > count)
str = PString((const char *)(payload+count+1), payload[count]);
PDWORDArray sources(count);
for (PINDEX i = 0; i < (PINDEX)count; i++)
sources[i] = ((const PUInt32b *)payload)[i];
OnRxGoodbye(sources, str);
}
else {
PTRACE(2, "RTP\tGoodbye packet truncated");
}
break;
case RTP_ControlFrame::e_ApplDefined :
if (size >= 4) {
PString str((const char *)(payload+4), 4);
OnRxApplDefined(str, frame.GetCount(), *(const PUInt32b *)payload,
payload+8, frame.GetPayloadSize()-8);
}
else {
PTRACE(2, "RTP\tApplDefined packet truncated");
}
break;
default :
PTRACE(2, "RTP\tUnknown control payload type: " << frame.GetPayloadType());
}
} while (frame.ReadNextCompound());
return e_ProcessPacket;
}
void RTP_Session::OnRxSenderReport(const SenderReport & PTRACE_PARAM(sender),
const ReceiverReportArray & PTRACE_PARAM(reports))
{
#if PTRACING
PTRACE(3, "RTP\tOnRxSenderReport: " << sender);
for (PINDEX i = 0; i < reports.GetSize(); i++)
PTRACE(3, "RTP\tOnRxSenderReport RR: " << reports[i]);
#endif
}
void RTP_Session::OnRxReceiverReport(DWORD PTRACE_PARAM(src),
const ReceiverReportArray & PTRACE_PARAM(reports))
{
#if PTRACING
PTRACE(3, "RTP\tOnReceiverReport: ssrc=" << src);
for (PINDEX i = 0; i < reports.GetSize(); i++)
PTRACE(3, "RTP\tOnReceiverReport RR: " << reports[i]);
#endif
}
void RTP_Session::OnRxSourceDescription(const SourceDescriptionArray & PTRACE_PARAM(description))
{
#if PTRACING
for (PINDEX i = 0; i < description.GetSize(); i++)
PTRACE(3, "RTP\tOnSourceDescription: " << description[i]);
#endif
}
void RTP_Session::OnRxGoodbye(const PDWORDArray & PTRACE_PARAM(src),
const PString & PTRACE_PARAM(reason))
{
PTRACE(3, "RTP\tOnGoodbye: \"" << reason << "\" srcs=" << src);
}
void RTP_Session::OnRxApplDefined(const PString & PTRACE_PARAM(type),
unsigned PTRACE_PARAM(subtype),
DWORD PTRACE_PARAM(src),
const BYTE * /*data*/, PINDEX PTRACE_PARAM(size))
{
PTRACE(3, "RTP\tOnApplDefined: \"" << type << "\"-" << subtype
<< " " << src << " [" << size << ']');
}
void RTP_Session::ReceiverReport::PrintOn(ostream & strm) const
{
strm << "ssrc=" << sourceIdentifier
<< " fraction=" << fractionLost
<< " lost=" << totalLost
<< " last_seq=" << lastSequenceNumber
<< " jitter=" << jitter
<< " lsr=" << lastTimestamp
<< " dlsr=" << delay;
}
void RTP_Session::SenderReport::PrintOn(ostream & strm) const
{
strm << "ssrc=" << sourceIdentifier
<< " ntp=" << realTimestamp.AsString("yyyy/M/d-h:m:s.uuuu")
<< " rtp=" << rtpTimestamp
<< " psent=" << packetsSent
<< " osent=" << octetsSent;
}
void RTP_Session::SourceDescription::PrintOn(ostream & strm) const
{
static const char * const DescriptionNames[RTP_ControlFrame::NumDescriptionTypes] = {
"END", "CNAME", "NAME", "EMAIL", "PHONE", "LOC", "TOOL", "NOTE", "PRIV"
};
strm << "ssrc=" << sourceIdentifier;
for (PINDEX i = 0; i < items.GetSize(); i++) {
strm << "\n item[" << i << "]: type=";
unsigned typeNum = items.GetKeyAt(i);
if (typeNum < PARRAYSIZE(DescriptionNames))
strm << DescriptionNames[typeNum];
else
strm << typeNum;
strm << " data=\""
<< items.GetDataAt(i)
<< '"';
}
}
DWORD RTP_Session::GetPacketsTooLate() const
{
return
#ifndef NO_H323_AUDIO_CODECS
jitter != NULL ? jitter->GetPacketsTooLate() :
#endif
0;
}
/////////////////////////////////////////////////////////////////////////////
RTP_SessionManager::RTP_SessionManager()
{
enumerationIndex = P_MAX_INDEX;
}
RTP_SessionManager::RTP_SessionManager(const RTP_SessionManager & sm)
: sessions(sm.sessions)
{
enumerationIndex = P_MAX_INDEX;
}
RTP_SessionManager & RTP_SessionManager::operator=(const RTP_SessionManager & sm)
{
PWaitAndSignal m1(mutex);
PWaitAndSignal m2(sm.mutex);
sessions = sm.sessions;
return *this;
}
RTP_Session * RTP_SessionManager::UseSession(unsigned sessionID)
{
mutex.Wait();
RTP_Session * session = sessions.GetAt(sessionID);
if (session == NULL)
return NULL; // Deliberately have not release mutex here! See AddSession.
PTRACE(3, "RTP\tFound existing session " << sessionID);
session->IncrementReference();
mutex.Signal();
return session;
}
void RTP_SessionManager::AddSession(RTP_Session * session)
{
if (PAssertNULL(session) != NULL) {
PTRACE(2, "RTP\tAdding session " << *session);
sessions.SetAt(session->GetSessionID(), session);
}
// The following is the mutex.Signal() that was not done in the UseSession()
mutex.Signal();
}
void RTP_SessionManager::ReleaseSession(unsigned sessionID)
{
PTRACE(2, "RTP\tReleasing session " << sessionID);
mutex.Wait();
if (sessions.Contains(sessionID)) {
if (sessions[sessionID].DecrementReference()) {
PTRACE(3, "RTP\tDeleting session " << sessionID);
sessions[sessionID].SetJitterBufferSize(0, 0);
sessions.SetAt(sessionID, NULL);
}
}
mutex.Signal();
}
RTP_Session * RTP_SessionManager::GetSession(unsigned sessionID) const
{
PWaitAndSignal wait(mutex);
if (!sessions.Contains(sessionID))
return NULL;
PTRACE(3, "RTP\tFound existing session " << sessionID);
return &sessions[sessionID];
}
RTP_Session * RTP_SessionManager::First()
{
mutex.Wait();
enumerationIndex = 0;
return Next();
}
RTP_Session * RTP_SessionManager::Next()
{
if (enumerationIndex < sessions.GetSize())
return &sessions.GetDataAt(enumerationIndex++);
Exit();
return NULL;
}
void RTP_SessionManager::Exit()
{
enumerationIndex = P_MAX_INDEX;
mutex.Signal();
}
/////////////////////////////////////////////////////////////////////////////
static void SetMinBufferSize(PUDPSocket & sock, int buftype)
{
int sz = 0;
if (sock.GetOption(buftype, sz)) {
if (sz >= UDP_BUFFER_SIZE)
return;
}
if (!sock.SetOption(buftype, UDP_BUFFER_SIZE)) {
PTRACE(1, "RTP_UDP\tSetOption(" << buftype << ") failed: " << sock.GetErrorText());
}
}
RTP_UDP::RTP_UDP(unsigned id, BOOL _remoteIsNAT)
: RTP_Session(id),
remoteAddress(0),
remoteTransmitAddress(0),
remoteIsNAT(_remoteIsNAT)
{
remoteDataPort = 0;
remoteControlPort = 0;
shutdownRead = FALSE;
shutdownWrite = FALSE;
dataSocket = NULL;
controlSocket = NULL;
appliedQOS = FALSE;
enableGQOS = FALSE;
}
RTP_UDP::~RTP_UDP()
{
Close(TRUE);
Close(FALSE);
delete dataSocket;
delete controlSocket;
}
void RTP_UDP::ApplyQOS(const PIPSocket::Address & addr)
{
if (controlSocket != NULL)
controlSocket->SetSendAddress(addr,GetRemoteControlPort());
if (dataSocket != NULL)
dataSocket->SetSendAddress(addr,GetRemoteDataPort());
appliedQOS = TRUE;
}
BOOL RTP_UDP::ModifyQOS(RTP_QOS * rtpqos)
{
BOOL retval = FALSE;
if (rtpqos == NULL)
return retval;
#if P_HAS_QOS
if (controlSocket != NULL)
retval = controlSocket->ModifyQoSSpec(&(rtpqos->ctrlQoS));
if (dataSocket != NULL)
retval &= dataSocket->ModifyQoSSpec(&(rtpqos->dataQoS));
#endif
appliedQOS = FALSE;
return retval;
}
void RTP_UDP::EnableGQoS()
{
enableGQOS = TRUE;
}
#if P_HAS_QOS
PQoS & RTP_UDP::GetQOS()
{
if (controlSocket != NULL)
return controlSocket->GetQoSSpec();
if (dataSocket != NULL)
return dataSocket->GetQoSSpec();
return *new PQoS();
}
#endif
BOOL RTP_UDP::Open(PIPSocket::Address _localAddress,
WORD portBase, WORD portMax,
BYTE tos,
#ifdef P_STUN
PSTUNClient * stun,
#else
void *,
#endif
RTP_QOS * rtpQos)
{
// save local address
localAddress = _localAddress;
localDataPort = (WORD)(portBase&0xfffe);
localControlPort = (WORD)(localDataPort + 1);
delete dataSocket;
delete controlSocket;
dataSocket = NULL;
controlSocket = NULL;
PQoS * dataQos = NULL;
PQoS * ctrlQos = NULL;
if (rtpQos != NULL) {
#if P_HAS_QOS
dataQos = &(rtpQos->dataQoS);
ctrlQos = &(rtpQos->ctrlQoS);
#endif
}
#if P_STUN
if (stun != NULL) {
if (stun->CreateSocketPair(dataSocket, controlSocket)) {
dataSocket->GetLocalAddress(localAddress, localDataPort);
controlSocket->GetLocalAddress(localAddress, localControlPort);
}
else
PTRACE(1, "RTP\tSTUN could not create socket pair!");
}
#endif
if (dataSocket == NULL || controlSocket == NULL) {
dataSocket = new PUDPSocket(dataQos);
controlSocket = new PUDPSocket(ctrlQos);
while (!dataSocket->Listen(localAddress, 1, localDataPort) ||
!controlSocket->Listen(localAddress, 1, localControlPort)) {
dataSocket->Close();
controlSocket->Close();
if ((localDataPort > portMax) || (localDataPort > 0xfffd))
return FALSE; // If it ever gets to here the OS has some SERIOUS problems!
localDataPort += 2;
localControlPort += 2;
}
}
// Set the IP Type Of Service field for prioritisation of media UDP packets
// through some Cisco routers and Linux boxes
if (!dataSocket->SetOption(IP_TOS, tos, IPPROTO_IP)) {
PTRACE(1, "RTP_UDP\tCould not set TOS field in IP header: " << dataSocket->GetErrorText());
}
// Increase internal buffer size on media UDP sockets
SetMinBufferSize(*dataSocket, SO_RCVBUF);
SetMinBufferSize(*dataSocket, SO_SNDBUF);
SetMinBufferSize(*controlSocket, SO_RCVBUF);
SetMinBufferSize(*controlSocket, SO_SNDBUF);
shutdownRead = FALSE;
shutdownWrite = FALSE;
if (canonicalName.Find('@') == P_MAX_INDEX)
canonicalName += '@' + GetLocalHostName();
PTRACE(2, "RTP_UDP\tSession " << sessionID << " created: "
<< localAddress << ':' << localDataPort << '-' << localControlPort
<< " ssrc=" << syncSourceOut);
return TRUE;
}
void RTP_UDP::Reopen(BOOL reading)
{
if (reading)
shutdownRead = FALSE;
else
shutdownWrite = FALSE;
}
void RTP_UDP::Close(BOOL reading)
{
if (reading) {
if (!shutdownRead) {
PTRACE(3, "RTP_UDP\tSession " << sessionID << ", Shutting down read.");
syncSourceIn = 0;
shutdownRead = TRUE;
if (dataSocket != NULL && controlSocket != NULL) {
PIPSocket::Address addr;
controlSocket->GetLocalAddress(addr);
if (addr.IsAny())
PIPSocket::GetHostAddress(addr);
dataSocket->WriteTo("", 1, addr, controlSocket->GetPort());
}
}
}
else {
PTRACE(3, "RTP_UDP\tSession " << sessionID << ", Shutting down write.");
shutdownWrite = TRUE;
}
}
PString RTP_UDP::GetLocalHostName()
{
return PIPSocket::GetHostName();
}
BOOL RTP_UDP::SetRemoteSocketInfo(PIPSocket::Address address, WORD port, BOOL isDataPort)
{
if (remoteIsNAT) {
PTRACE(3, "RTP_UDP\tIgnoring remote socket info as remote is behind NAT");
return TRUE;
}
PTRACE(3, "RTP_UDP\tSetRemoteSocketInfo: session=" << sessionID << ' '
<< (isDataPort ? "data" : "control") << " channel, "
"new=" << address << ':' << port << ", "
"local=" << localAddress << ':' << localDataPort << '-' << localControlPort << ", "
"remote=" << remoteAddress << ':' << remoteDataPort << '-' << remoteControlPort);
if (localAddress == address && (isDataPort ? localDataPort : localControlPort) == port)
return TRUE;
remoteAddress = address;
if (isDataPort) {
remoteDataPort = port;
if (remoteControlPort == 0)
remoteControlPort = (WORD)(port + 1);
}
else {
remoteControlPort = port;
if (remoteDataPort == 0)
remoteDataPort = (WORD)(port - 1);
}
if (!appliedQOS)
ApplyQOS(remoteAddress);
return remoteAddress != 0 && port != 0;
}
BOOL RTP_UDP::ReadData(RTP_DataFrame & frame)
{
for (;;) {
int selectStatus = PSocket::Select(*dataSocket, *controlSocket, reportTimer);
if (shutdownRead) {
PTRACE(3, "RTP_UDP\tSession " << sessionID << ", Read shutdown.");
shutdownRead = FALSE;
return FALSE;
}
switch (selectStatus) {
case -2 :
if (ReadControlPDU() == e_AbortTransport)
return FALSE;
break;
case -3 :
if (ReadControlPDU() == e_AbortTransport)
return FALSE;
// Then do -1 case
case -1 :
switch (ReadDataPDU(frame)) {
case e_ProcessPacket :
if (!shutdownRead)
return TRUE;
case e_IgnorePacket :
break;
case e_AbortTransport :
return FALSE;
}
break;
case 0 :
PTRACE(5, "RTP_UDP\tSession " << sessionID << ", check for sending report.");
if (!SendReport())
return FALSE;
break;
case PSocket::Interrupted:
PTRACE(3, "RTP_UDP\tSession " << sessionID << ", Interrupted.");
return FALSE;
default :
PTRACE(1, "RTP_UDP\tSession " << sessionID << ", Select error: "
<< PChannel::GetErrorText((PChannel::Errors)selectStatus));
return FALSE;
}
}
}
RTP_Session::SendReceiveStatus RTP_UDP::ReadDataOrControlPDU(PUDPSocket & socket,
PBYTEArray & frame,
BOOL fromDataChannel)
{
#if PTRACING
const char * channelName = fromDataChannel ? "Data" : "Control";
#endif
PIPSocket::Address addr;
WORD port;
if (socket.ReadFrom(frame.GetPointer(), frame.GetSize(), addr, port)) {
if (ignoreOtherSources) {
// If remote address never set from higher levels, then try and figure
// it out from the first packet received.
if (!remoteAddress.IsValid()) {
remoteAddress = addr;
PTRACE(4, "RTP\tSet remote address from first " << channelName
<< " PDU from " << addr << ':' << port);
}
if (fromDataChannel) {
if (remoteDataPort == 0)
remoteDataPort = port;
}
else {
if (remoteControlPort == 0)
remoteControlPort = port;
}
if (!remoteTransmitAddress.IsValid())
remoteTransmitAddress = addr;
else if (remoteTransmitAddress != addr) {
PTRACE(1, "RTP_UDP\tSession " << sessionID << ", "
<< channelName << " PDU from incorrect host, "
" is " << addr << " should be " << remoteTransmitAddress);
return RTP_Session::e_IgnorePacket;
}
}
if (remoteAddress.IsValid() && !appliedQOS)
ApplyQOS(remoteAddress);
return RTP_Session::e_ProcessPacket;
}
switch (socket.GetErrorNumber()) {
case ECONNRESET :
case ECONNREFUSED :
PTRACE(2, "RTP_UDP\tSession " << sessionID << ", "
<< channelName << " port on remote not ready.");
return RTP_Session::e_IgnorePacket;
case EAGAIN :
// Shouldn't happen, but it does.
return RTP_Session::e_IgnorePacket;
default:
PTRACE(1, "RTP_UDP\t" << channelName << " read error ("
<< socket.GetErrorNumber(PChannel::LastReadError) << "): "
<< socket.GetErrorText(PChannel::LastReadError));
return RTP_Session::e_AbortTransport;
}
}
RTP_Session::SendReceiveStatus RTP_UDP::ReadDataPDU(RTP_DataFrame & frame)
{
SendReceiveStatus status = ReadDataOrControlPDU(*dataSocket, frame, TRUE);
if (status != e_ProcessPacket)
return status;
// Check received PDU is big enough
PINDEX pduSize = dataSocket->GetLastReadCount();
if (pduSize < RTP_DataFrame::MinHeaderSize || pduSize < frame.GetHeaderSize()) {
PTRACE(2, "RTP_UDP\tSession " << sessionID
<< ", Received data packet too small: " << pduSize << " bytes");
return e_IgnorePacket;
}
frame.SetPayloadSize(pduSize - frame.GetHeaderSize());
return OnReceiveData(frame);
}
RTP_Session::SendReceiveStatus RTP_UDP::ReadControlPDU()
{
RTP_ControlFrame frame(2048);
SendReceiveStatus status = ReadDataOrControlPDU(*controlSocket, frame, FALSE);
if (status != e_ProcessPacket)
return status;
PINDEX pduSize = controlSocket->GetLastReadCount();
if (pduSize < 4 || pduSize < 4+frame.GetPayloadSize()) {
PTRACE(2, "RTP_UDP\tSession " << sessionID
<< ", Received control packet too small: " << pduSize << " bytes");
return e_IgnorePacket;
}
frame.SetSize(pduSize);
return OnReceiveControl(frame);
}
BOOL RTP_UDP::WriteData(RTP_DataFrame & frame)
{
if (shutdownWrite) {
PTRACE(3, "RTP_UDP\tSession " << sessionID << ", Write shutdown.");
shutdownWrite = FALSE;
return FALSE;
}
// Trying to send a PDU before we are set up!
if (!remoteAddress.IsValid() || remoteDataPort == 0)
return TRUE;
switch (OnSendData(frame)) {
case e_ProcessPacket :
break;
case e_IgnorePacket :
return TRUE;
case e_AbortTransport :
return FALSE;
}
while (!dataSocket->WriteTo(frame.GetPointer(),
frame.GetHeaderSize()+frame.GetPayloadSize(),
remoteAddress, remoteDataPort)) {
switch (dataSocket->GetErrorNumber()) {
case ECONNRESET :
case ECONNREFUSED :
PTRACE(2, "RTP_UDP\tSession " << sessionID << ", data port on remote not ready.");
break;
default:
PTRACE(1, "RTP_UDP\tSession " << sessionID
<< ", Write error on data port ("
<< dataSocket->GetErrorNumber(PChannel::LastWriteError) << "): "
<< dataSocket->GetErrorText(PChannel::LastWriteError));
return FALSE;
}
}
return TRUE;
}
BOOL RTP_UDP::WriteControl(RTP_ControlFrame & frame)
{
// Trying to send a PDU before we are set up!
if (!remoteAddress.IsValid() || remoteControlPort == 0)
return TRUE;
while (!controlSocket->WriteTo(frame.GetPointer(), frame.GetCompoundSize(),
remoteAddress, remoteControlPort)) {
switch (controlSocket->GetErrorNumber()) {
case ECONNRESET :
case ECONNREFUSED :
PTRACE(2, "RTP_UDP\tSession " << sessionID << ", control port on remote not ready.");
break;
default:
PTRACE(1, "RTP_UDP\tSession " << sessionID
<< ", Write error on control port ("
<< controlSocket->GetErrorNumber(PChannel::LastWriteError) << "): "
<< controlSocket->GetErrorText(PChannel::LastWriteError));
}
}
return TRUE;
}
/////////////////////////////////////////////////////////////////////////////
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