SyncSource(3)

NAME
SyncSource -

Synchronization source in an RTP session.

SYNOPSIS

#include <sources.h>

  Public Types
enum State { stateUnknown, statePrevalid, stateActive, stateInactive, stateLeaving }
Synchronization source states during an RTP session.

  Public Member Functions
SyncSource (uint32 ssrc)
~SyncSource ()
State getState () const
bool isSender () const
Whether this source sends RTP data packets.
uint32 getID () const
Participant * getParticipant () const
Get the participant this synchronization source is asociated to.
tpport_t getDataTransportPort () const
tpport_t getControlTransportPort () const
const InetAddress & getNetworkAddress () const

  Protected Member Functions
SyncSource (const SyncSource &source)
SyncSource & operator= (const SyncSource &source)

  Friends
class SyncSourceHandler

Detailed Description

Synchronization source in an RTP session. Each synchronization source in an RTP session is identified by a 32-bit numeric SSRC identifier. Each SyncSource object is related to a Participant object, which can be retrieved through the getParticipant() method.

Author:
    Federico Montesino Pouzols <fedemp@altern.org>

Examples:

ccrtptest.cpp, and rtplisten.cpp.

Member Enumeration Documentation

  enum SyncSource::State

Synchronization source states during an RTP session. In general, new synchronization sources are not considered valid until multiple valid data packets or a valid RTCP compound packet has been received from the new source (

See also:
    IncomingDataQueue::setMinValidPacketSequence()). Thus, the source will probably be in statePrevalid before reaching one of the two states that indicate a valid source: stateActive and stateInactive.

A valid participant is in stateActive state if RTP and/or RTCP packets are currently being received from it. If, after a small number of RTCP report intervals (see IncomingDataQueue::setSourceExpirationPeriod() ), no packets are received, it will reach the stateInactive state. If, after a small number of RTCP report intervals, no packet is received from an inactive source, it will be deleted.

If RTCP is being used, after receiving a BYE RTCP packet from a synchronization source, it will reach the stateLeaving state and will be deleted after a delay (see QueueRTCPManager::setLeavingDelay()).

Sources in statePrevalid and stateLeaving are not counted for the number of session members estimation.

Enumerator:

stateUnknown
    No valid packet has been received.

statePrevalid
    Some packets have been received, but source validity not yet guaranteed.

stateActive
    We currently receive packets (data or control) from this source.

stateInactive
    Was active in the near past but no packet from this source has been received lately.

stateLeaving
    An RTCP BYE has been received from the source.

Constructor & Destructor Documentation

  SyncSource::SyncSource (uint32 ssrc) Parameters:
    ssrc SSRC identifier of the source, unique in each session.

  SyncSource::~SyncSource ()

  SyncSource::SyncSource (const SyncSource & source) [protected] Parameters:
    source The RTPSource object being copied

Member Function Documentation

  tpport_t SyncSource::getControlTransportPort () const [inline]

Examples:
ccrtptest.cpp, and rtplisten.cpp.

  tpport_t SyncSource::getDataTransportPort () const [inline]

Examples:
ccrtptest.cpp, and rtplisten.cpp.

  uint32 SyncSource::getID () const [inline]

Examples:
ccrtptest.cpp, and rtplisten.cpp.

  const InetAddress& SyncSource::getNetworkAddress () const [inline]

Examples:
ccrtptest.cpp, and rtplisten.cpp.

  Participant* SyncSource::getParticipant () const [inline]

Get the participant this synchronization source is asociated to. Return values:
    NULL if the stack has not been yet able to identify the participant this source is associated to.

Examples:
ccrtptest.cpp, and rtplisten.cpp.

  State SyncSource::getState () const [inline]

  bool SyncSource::isSender () const [inline]

Whether this source sends RTP data packets.

Examples:
ccrtptest.cpp.

  SyncSource& SyncSource::operator= (const SyncSource & source) [protected]

Friends And Related Function Documentation

  friend class SyncSourceHandler [friend]

Author

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