Provided by: libccrtp-doc_2.0.9-4.1_all 
NAME
IncomingDataQueue - Queue for incoming RTP data packets in an RTP session.
SYNOPSIS
#include <iqueue.h>
Inherits IncomingDataQueueBase, and MembershipBookkeeping.
Inherited by RTPDataQueue.
Classes
class SyncSourcesIterator
iterator through the list of synchronizations sources in this session
Public Member Functions
SyncSourcesIterator begin ()
SyncSourcesIterator end ()
const AppDataUnit * getData (uint32 stamp, const SyncSource *src=NULL)
Retreive data from a specific timestamped packet if such a packet is currently available in the
receive buffer.
bool isWaiting (const SyncSource *src=NULL) const
Determine if packets are waiting in the reception queue.
uint32 getFirstTimestamp (const SyncSource *src=NULL) const
Get timestamp of first packet waiting in the queue.
void setMinValidPacketSequence (uint8 packets)
When receiving packets from a new source, it may be convenient to reject a first few packets before
we are really sure the source is valid.
uint8 getDefaultMinValidPacketSequence () const
uint8 getMinValidPacketSequence () const
Get the minimun number of consecutive packets that must be received from a source before accepting
its data packets.
void setMaxPacketMisorder (uint16 packets)
uint16 getDefaultMaxPacketMisorder () const
uint16 getMaxPacketMisorder () const
void setMaxPacketDropout (uint16 packets)
It also prevents packets sent after a restart of the source being immediately accepted.
uint16 getDefaultMaxPacketDropout () const
uint16 getMaxPacketDropout () const
void setInQueueCryptoContext (CryptoContext *cc)
Set input queue CryptoContext.
void removeInQueueCryptoContext (CryptoContext *cc)
Remove input queue CryptoContext.
CryptoContext * getInQueueCryptoContext (uint32 ssrc)
Get an input queue CryptoContext identified by SSRC.
Public Member Functions inherited from IncomingDataQueueBase
size_t getDefaultMaxRecvPacketSize () const
size_t getMaxRecvPacketSize () const
void setMaxRecvPacketSize (size_t maxsize)
Public Member Functions inherited from RTPQueueBase
bool setPayloadFormat (const PayloadFormat &pf)
Set the payload format in use, for timing and payload type identification purposes.
uint32 getLocalSSRC () const
uint32 getCurrentRTPClockRate () const
Get the clock rate in RTP clock units (for instance, 8000 units per second for PCMU, or 90000 units
per second for MP2T).
PayloadType getCurrentPayloadType () const
timeval getInitialTime () const
Static Public Member Functions
static size_t getDefaultMembersSize ()
Protected Member Functions
IncomingDataQueue (uint32 size)
virtual ~IncomingDataQueue ()
bool checkSSRCInIncomingRTPPkt (SyncSourceLink &sourceLink, bool is_new, InetAddress &na, tpport_t tp)
Apply collision and loop detection and correction algorithm when receiving RTP data packets.
void setSourceExpirationPeriod (uint8 intervals)
Set the number of RTCP intervals that the stack will wait to change the state of a source from
stateActive to stateInactive, or to delete the source after being in stateInactive.
virtual size_t takeInDataPacket ()
This function is used by the service thread to process the next incoming packet and place it in the
receive list.
void renewLocalSSRC ()
IncomingDataQueue::IncomingRTPPktLink * getWaiting (uint32 timestamp, const SyncSource *src=NULL)
This is used to fetch a packet in the receive queue and to expire packets older than the current
timestamp.
bool recordReception (SyncSourceLink &srcLink, const IncomingRTPPkt &pkt, const timeval recvtime)
Log reception of a new RTP packet from this source.
void recordExtraction (const IncomingRTPPkt &pkt)
Log extraction of a packet from this source from the scheduled reception queue.
void purgeIncomingQueue ()
virtual void onNewSyncSource (const SyncSource &)
Virtual called when a new synchronization source has joined the session.
virtual bool onRTPPacketRecv (IncomingRTPPkt &)
A virtual function to support parsing of arriving packets to determine if they should be kept in the
queue and to dispatch events.
virtual void onExpireRecv (IncomingRTPPkt &)
A hook to filter packets in the receive queue that are being expired.
virtual bool onSRTPPacketError (IncomingRTPPkt &pkt, int32 errorCode)
A hook that gets called if the decoding of an incoming SRTP was erroneous.
virtual bool end2EndDelayed (IncomingRTPPktLink &)
bool insertRecvPacket (IncomingRTPPktLink *packetLink)
Insert a just received packet in the queue (both general and source specific queues).
virtual size_t recvData (unsigned char *buffer, size_t length, InetHostAddress &host, tpport_t &port)=0
This function performs the physical I/O for reading a packet from the source.
virtual size_t getNextDataPacketSize () const =0
Protected Member Functions inherited from IncomingDataQueueBase
IncomingDataQueueBase ()
virtual ~IncomingDataQueueBase ()
Protected Member Functions inherited from RTPQueueBase
RTPQueueBase (uint32 *ssrc=NULL)
void setLocalSSRC (uint32 ssrc)
uint32 getLocalSSRCNetwork () const
virtual ~RTPQueueBase ()
virtual size_t dispatchBYE (const std::string &)
A plugin point for posting of BYE messages.
Protected Member Functions inherited from MembershipBookkeeping
MembershipBookkeeping (uint32 initialSize=defaultMembersHashSize)
The initial size is a hint to allocate the resources needed in order to keep the members' identifiers
and associated information.
virtual ~MembershipBookkeeping ()
Purges all RTPSource structures created during the session, as well as the hash table and the list of
sources.
SyncSourceLink * getLink (const SyncSource &source) const
bool isMine (const SyncSource &source) const
Get whether a synchronization source is recorded in this membership controller.
bool isRegistered (uint32 ssrc)
Returns whether there is already a synchronizacion source with 'ssrc' SSRC identifier.
SyncSourceLink * getSourceBySSRC (uint32 ssrc, bool &created)
Get the description of a source by its ssrc identifier.
bool BYESource (uint32 ssrc)
Mark the source identified by ssrc as having sent a BYE packet.
bool removeSource (uint32 ssrc)
Remove the description of the source identified by ssrc
SyncSourceLink * getFirst ()
SyncSourceLink * getLast ()
uint32 getMembersCount ()
void setMembersCount (uint32 n)
uint32 getSendersCount ()
size_t getDefaultMembersHashSize ()
Protected Member Functions inherited from SyncSourceHandler
SyncSourceHandler ()
virtual ~SyncSourceHandler ()
void * getLink (const SyncSource &source) const
This requires SyncSource - SyncSourceHandler friendship.
void setLink (SyncSource &source, void *link)
void setParticipant (SyncSource &source, Participant &p)
void setState (SyncSource &source, SyncSource::State ns)
void setSender (SyncSource &source, bool active)
void setDataTransportPort (SyncSource &source, tpport_t p)
void setControlTransportPort (SyncSource &source, tpport_t p)
void setNetworkAddress (SyncSource &source, InetAddress addr)
Protected Member Functions inherited from ParticipantHandler
ParticipantHandler ()
virtual ~ParticipantHandler ()
void setSDESItem (Participant *part, SDESItemType item, const std::string &val)
void setPRIVPrefix (Participant *part, const std::string val)
Protected Member Functions inherited from ApplicationHandler
ApplicationHandler ()
virtual ~ApplicationHandler ()
void addParticipant (RTPApplication &app, Participant &part)
void removeParticipant (RTPApplication &app, RTPApplication::ParticipantLink *pl)
Protected Member Functions inherited from ConflictHandler
ConflictHandler ()
virtual ~ConflictHandler ()
ConflictingTransportAddress * searchDataConflict (InetAddress na, tpport_t dtp)
ConflictingTransportAddress * searchControlConflict (InetAddress na, tpport_t ctp)
void updateConflict (ConflictingTransportAddress &ca)
void addConflict (const InetAddress &na, tpport_t dtp, tpport_t ctp)
Protected Attributes
ThreadLock recvLock
IncomingRTPPktLink * recvFirst
IncomingRTPPktLink * recvLast
uint8 minValidPacketSequence
uint16 maxPacketMisorder
uint16 maxPacketDropout
uint8 sourceExpirationPeriod
Mutex cryptoMutex
std::list< CryptoContext * > cryptoContexts
Protected Attributes inherited from ConflictHandler
ConflictingTransportAddress * firstConflict
ConflictingTransportAddress * lastConflict
Static Protected Attributes
static const uint8 defaultMinValidPacketSequence
static const uint16 defaultMaxPacketMisorder
static const uint16 defaultMaxPacketDropout
static const size_t defaultMembersSize
Static Protected Attributes inherited from MembershipBookkeeping
static const size_t defaultMembersHashSize
static const uint32 SEQNUMMOD
Detailed Description
Queue for incoming RTP data packets in an RTP session.
Author
Federico Montesino Pouzols fedemp@altern.org
Constructor & Destructor Documentation
IncomingDataQueue::IncomingDataQueue (uint32 size) [protected]
Parameters
size initial size of the membership table.
virtual IncomingDataQueue::~IncomingDataQueue () [inline], [protected], [virtual]
Member Function Documentation
SyncSourcesIterator IncomingDataQueue::begin () [inline]
bool IncomingDataQueue::checkSSRCInIncomingRTPPkt (SyncSourceLink & sourceLink, bool is_new, InetAddress &
na, tpport_t tp) [protected]
Apply collision and loop detection and correction algorithm when receiving RTP data packets. Follows
section 8.2 in draft-ietf-avt-rtp-new.
Parameters
sourceLink link to the source object.
is_new whether the source has been just recorded.
na data packet network address.
tp data packet source transport port.
Returns
whether the packet must not be discarded.
SyncSourcesIterator IncomingDataQueue::end () [inline]
virtual bool IncomingDataQueue::end2EndDelayed (IncomingRTPPktLink &) [inline], [protected], [virtual]
const AppDataUnit * IncomingDataQueue::getData (uint32 stamp, const SyncSource * src = NULL)
Retreive data from a specific timestamped packet if such a packet is currently available in the receive
buffer.
Parameters
stamp Data unit timestamp.
src Optional synchronization source selector.
Returns
data retrieved from the reception buffer.
Return values
null pointer if no packet with such timestamp is available.
Examples
audiorx.cpp, rtpduphello.cpp, rtphello.cpp, and rtplisten.cpp.
uint16 IncomingDataQueue::getDefaultMaxPacketDropout () const [inline]
uint16 IncomingDataQueue::getDefaultMaxPacketMisorder () const [inline]
static size_t IncomingDataQueue::getDefaultMembersSize () [inline], [static]
uint8 IncomingDataQueue::getDefaultMinValidPacketSequence () const [inline]
uint32 IncomingDataQueue::getFirstTimestamp (const SyncSource * src = NULL) const
Get timestamp of first packet waiting in the queue.
Parameters
src optional source selector.
Returns
timestamp of first arrival packet.
Examples
audiorx.cpp, rtpduphello.cpp, rtphello.cpp, and rtplisten.cpp.
CryptoContext * IncomingDataQueue::getInQueueCryptoContext (uint32 ssrc)
Get an input queue CryptoContext identified by SSRC.
Parameters
ssrc Request CryptoContext for this incoming SSRC
Returns
Pointer to CryptoContext of the SSRC of NULL if no context available for this SSRC.
uint16 IncomingDataQueue::getMaxPacketDropout () const [inline]
uint16 IncomingDataQueue::getMaxPacketMisorder () const [inline]
uint8 IncomingDataQueue::getMinValidPacketSequence () const [inline]
Get the minimun number of consecutive packets that must be received from a source before accepting its
data packets.
virtual size_t IncomingDataQueue::getNextDataPacketSize () const [protected], [pure virtual]
Implemented in RTPDuplex, TRTPSessionBase< RTPDataChannel, RTCPChannel, ServiceQueue >, and
TRTPSessionBase< DualRTPUDPIPv4Channel, DualRTPUDPIPv4Channel, AVPQueue >.
IncomingDataQueue::IncomingRTPPktLink * IncomingDataQueue::getWaiting (uint32 timestamp, const SyncSource *
src = NULL) [protected]
This is used to fetch a packet in the receive queue and to expire packets older than the current
timestamp.
Returns
packet buffer object for current timestamp if found.
Parameters
timestamp timestamp requested.
src optional source selector
Note
if found, the packet is removed from the reception queue
bool IncomingDataQueue::insertRecvPacket (IncomingRTPPktLink * packetLink) [protected]
Insert a just received packet in the queue (both general and source specific queues). If the packet was
already in the queue (same SSRC and sequence number), it is not inserted but deleted.
Parameters
packetLink link to a packet just received and generally validated and processed by onRTPPacketRecv.
Returns
whether the packet was successfully inserted.
Return values
false when the packet is duplicated (there is already a packet from the same source with the same
timestamp).
true when the packet is not duplicated.
bool IncomingDataQueue::isWaiting (const SyncSource * src = NULL) const
Determine if packets are waiting in the reception queue.
Parameters
src Optional synchronization source selector.
Returns
True if packets are waiting.
virtual void IncomingDataQueue::onExpireRecv (IncomingRTPPkt &) [inline], [protected], [virtual]
A hook to filter packets in the receive queue that are being expired. This hook may be used to do some
application specific processing on expired packets before they are deleted.
Parameters
- packet expired from the recv queue.
virtual void IncomingDataQueue::onNewSyncSource (const SyncSource &) [inline], [protected], [virtual]
Virtual called when a new synchronization source has joined the session.
Parameters
- new synchronization source
Examples
rtplisten.cpp.
virtual bool IncomingDataQueue::onRTPPacketRecv (IncomingRTPPkt &) [inline], [protected], [virtual]
A virtual function to support parsing of arriving packets to determine if they should be kept in the
queue and to dispatch events. A generic header validity check (as specified in RFC 1889) is performed on
every incoming packet. If the generic check completes successfully, this method is called before the
packet is actually inserted into the reception queue.
May be used to perform additional validity checks or to do some application specific processing.
Parameters
- packet just received.
Returns
true if packet is kept in the incoming packets queue.
virtual bool IncomingDataQueue::onSRTPPacketError (IncomingRTPPkt & pkt, int32 errorCode) [inline],
[protected], [virtual]
A hook that gets called if the decoding of an incoming SRTP was erroneous.
Parameters
pkt The SRTP packet with error.
errorCode The error code: -1 - SRTP authentication failure, -2 - replay check failed
Returns
True: put the packet in incoming queue for further processing by the applications; false: dismiss
packet. The default implementation returns false.
void IncomingDataQueue::purgeIncomingQueue () [protected]
void IncomingDataQueue::recordExtraction (const IncomingRTPPkt & pkt) [protected]
Log extraction of a packet from this source from the scheduled reception queue.
Parameters
pkt Packet extracted from the queue.
bool IncomingDataQueue::recordReception (SyncSourceLink & srcLink, const IncomingRTPPkt & pkt, const timeval
recvtime) [protected]
Log reception of a new RTP packet from this source. Usually updates data such as the packet counter, the
expected sequence number for the next packet and the time the last packet was received at.
Parameters
srcLink Link structure for the synchronization source of this packet.
pkt Packet just created and to be logged.
recvtime Reception time.
Returns
whether, according to the source state and statistics, the packet is considered valid and must be
inserted in the incoming packets queue.
virtual size_t IncomingDataQueue::recvData (unsigned char * buffer, size_t length, InetHostAddress & host,
tpport_t & port) [protected], [pure virtual]
This function performs the physical I/O for reading a packet from the source. It is a virtual that is
overridden in the derived class.
Returns
number of bytes read.
Parameters
buffer of read packet.
length of data to read.
host address of source.
port number of source.
Implemented in RTPDuplex, TRTPSessionBase< RTPDataChannel, RTCPChannel, ServiceQueue >, and
TRTPSessionBase< DualRTPUDPIPv4Channel, DualRTPUDPIPv4Channel, AVPQueue >.
void IncomingDataQueue::removeInQueueCryptoContext (CryptoContext * cc)
Remove input queue CryptoContext. The endQueue method (provided by RTPQueue) also deletes all registered
CryptoContexts.
Parameters
cc Pointer to initialized CryptoContext to remove. If pointer if NULL then delete the whole queue
void IncomingDataQueue::renewLocalSSRC () [protected], [virtual]
Reimplemented from RTPQueueBase.
Reimplemented in RTPDataQueue.
void IncomingDataQueue::setInQueueCryptoContext (CryptoContext * cc)
Set input queue CryptoContext. The endQueue method (provided by RTPQueue) deletes all registered
CryptoContexts.
Parameters
cc Pointer to initialized CryptoContext.
void IncomingDataQueue::setMaxPacketDropout (uint16 packets) [inline]
It also prevents packets sent after a restart of the source being immediately accepted.
void IncomingDataQueue::setMaxPacketMisorder (uint16 packets) [inline]
void IncomingDataQueue::setMinValidPacketSequence (uint8 packets) [inline]
When receiving packets from a new source, it may be convenient to reject a first few packets before we
are really sure the source is valid. This method sets how many data packets must be received in sequence
before the source is considered valid and the stack starts to accept its packets.
Note
the default (see defaultMinValidPacketSequence()) value for this parameter is 0, so that no packets
are rejected (data packets are accepted from the first one).
this validation is performed after the generic header validation and the additional validation done
in onRTPPacketRecv().
if any valid RTCP packet is received from this source, it will be immediatly considered valid
regardless of the number of sequential data packets received.
Parameters
packets number of sequential packet required
void IncomingDataQueue::setSourceExpirationPeriod (uint8 intervals) [inline], [protected]
Set the number of RTCP intervals that the stack will wait to change the state of a source from
stateActive to stateInactive, or to delete the source after being in stateInactive. Note that this value
should be uniform accross all participants and SHOULD be fixed for a particular profile.
Parameters
intervals number of RTCP report intervals
Note
If RTCP is not being used, the RTCP interval is assumed to be the default: 5 seconds.
The default for this value is, as RECOMMENDED, 5.
virtual size_t IncomingDataQueue::takeInDataPacket () [protected], [virtual]
This function is used by the service thread to process the next incoming packet and place it in the
receive list.
Returns
number of payload bytes received. <0 if error.
Reimplemented in SingleThreadRTPSession< RTPDataChannel, RTCPChannel, ServiceQueue >.
Member Data Documentation
std::list<CryptoContext *> IncomingDataQueue::cryptoContexts [protected] Mutex IncomingDataQueue::cryptoMutex [mutable], [protected] const uint16 IncomingDataQueue::defaultMaxPacketDropout [static], [protected] const uint16 IncomingDataQueue::defaultMaxPacketMisorder [static], [protected] const size_t IncomingDataQueue::defaultMembersSize [static], [protected] const uint8 IncomingDataQueue::defaultMinValidPacketSequence [static], [protected] uint16 IncomingDataQueue::maxPacketDropout [protected] uint16 IncomingDataQueue::maxPacketMisorder [protected] uint8 IncomingDataQueue::minValidPacketSequence [protected] IncomingRTPPktLink* IncomingDataQueue::recvFirst [protected] IncomingRTPPktLink * IncomingDataQueue::recvLast [protected] ThreadLock IncomingDataQueue::recvLock [mutable], [protected] uint8 IncomingDataQueue::sourceExpirationPeriod [protected]
Author
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