Provided by: libccrtp-doc_2.0.9-2.2build1_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.
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 Attributes
ThreadLock recvLock
IncomingRTPPktLink * recvFirst
IncomingRTPPktLink * recvLast
uint8 minValidPacketSequence
uint16 maxPacketMisorder
uint16 maxPacketDropout
uint8 sourceExpirationPeriod
Mutex cryptoMutex
std::list< CryptoContext * > cryptoContexts
Static Protected Attributes
static const uint8 defaultMinValidPacketSequence
static const uint16 defaultMaxPacketMisorder
static const uint16 defaultMaxPacketDropout
static const size_t defaultMembersSize
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:
rtpduphello.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:
rtpduphello.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.
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
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.
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.
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.
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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