incomingdataqueue(3)

NAME

IncomingDataQueue - Queue for incoming RTP data packets in an RTP
session.

SYNOPSIS

#include <iqueue.h>
Inherits IncomingDataQueueBase, and MembershipBookkeeping.
Inherited by RTPDataQueue.
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
Classes
class SyncSourcesIterator
    iterator through the list of synchronizations sources in this
    session

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] SyncSourcesIterator IncomingDataQueue::end () [inline] 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.
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.
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.
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
uint8 IncomingDataQueue::getDefaultMinValidPacketSequence () 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.
void IncomingDataQueue::setMaxPacketMisorder (uint16 packets) [inline] uint16 IncomingDataQueue::getDefaultMaxPacketMisorder () const [inline] uint16 IncomingDataQueue::getMaxPacketMisorder () const [inline] void IncomingDataQueue::setMaxPacketDropout (uint16 packets) [inline]: It also prevents packets sent after a restart of the source being
immediately accepted.
uint16 IncomingDataQueue::getDefaultMaxPacketDropout () const [inline] uint16 IncomingDataQueue::getMaxPacketDropout () const [inline] static size_t IncomingDataQueue::getDefaultMembersSize () [inline, static] 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::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
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.
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.
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.
void IncomingDataQueue::renewLocalSSRC () [protected, virtual]: Reimplemented from RTPQueueBase.; Reimplemented in RTPDataQueue.
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::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.
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.
void IncomingDataQueue::purgeIncomingQueue () [protected] 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 succesfully,
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 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 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.
virtual bool IncomingDataQueue::end2EndDelayed (IncomingRTPPktLink &): [inline, protected, virtual]
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.
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 overriden 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.
virtual size_t IncomingDataQueue::getNextDataPacketSize () const: [protected, pure virtual] Implemented in RTPDuplex.

Member Data Documentation

ThreadLock IncomingDataQueue::recvLock [mutable, protected] IncomingRTPPktLink* IncomingDataQueue::recvFirst [protected] IncomingRTPPktLink * IncomingDataQueue::recvLast [protected] const uint8 IncomingDataQueue::defaultMinValidPacketSequence [static,: protected]
const uint16 IncomingDataQueue::defaultMaxPacketMisorder [static,: protected]
const uint16 IncomingDataQueue::defaultMaxPacketDropout [static, protected] uint8 IncomingDataQueue::minValidPacketSequence [protected] uint16 IncomingDataQueue::maxPacketMisorder [protected] uint16 IncomingDataQueue::maxPacketDropout [protected] const size_t IncomingDataQueue::defaultMembersSize [static, protected] uint8 IncomingDataQueue::sourceExpirationPeriod [protected] Mutex IncomingDataQueue::cryptoMutex [mutable, protected] std::list<CryptoContext *> IncomingDataQueue::cryptoContexts [protected]

Author

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incomingdataqueue(3)

NAME

SYNOPSIS

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation

Author