NAME

       OutgoingDataQueue - A generic outgoing RTP data queue supporting multiple destinations.

SYNOPSIS

       #include <oqueue.h>

       Inherits OutgoingDataQueueBase, and DestinationListHandler.

       Inherited by RTPDataQueue.

   Classes
       struct OutgoingRTPPktLink

   Public Member Functions
       bool addDestination (const InetHostAddress &ia, tpport_t dataPort=DefaultRTPDataPort,
           tpport_t controlPort=0)
       bool addDestination (const InetMcastAddress &ia, tpport_t dataPort=DefaultRTPDataPort,
           tpport_t controlPort=0)
       bool forgetDestination (const InetHostAddress &ia, tpport_t dataPort=DefaultRTPDataPort,
           tpport_t controlPort=0)
       bool forgetDestination (const InetMcastAddress &ia, tpport_t dataPort=DefaultRTPDataPort,
           tpport_t controlPort=0)
       void addContributor (uint32 csrc)
           Add csrc as the CSRC identifier of a new contributor.
       bool removeContributor (uint32 csrc)
           Remove CSRC from the list of contributors.
       bool isSending () const
           Determine if outgoing packets are waiting to send.
       void putData (uint32 stamp, const unsigned char *data=NULL, size_t len=0)
           This is used to create a data packet in the send queue.
       void sendImmediate (uint32 stamp, const unsigned char *data=NULL, size_t len=0)
           This is used to create a data packet and send it immediately.
       void setPadding (uint8 paddinglen)
           Set padding.
       void setMark (bool mark)
           Set marker bit for the packet in which the next data provided will be send.
       bool getMark () const
           Get whether the mark bit will be set in the next packet.
       size_t setPartial (uint32 timestamp, unsigned char *data, size_t offset, size_t max)
           Set partial data for an already queued packet.
       microtimeout_t getDefaultSchedulingTimeout () const
       void setSchedulingTimeout (microtimeout_t to)
           Set the default scheduling timeout to use when no data packets are waiting to be sent.
       microtimeout_t getDefaultExpireTimeout () const
       void setExpireTimeout (microtimeout_t to)
           Set the 'expired' timer for expiring packets pending in the send queue which have gone
           unsent and are already 'too late' to be sent now.
       microtimeout_t getExpireTimeout () const
       uint32 getSendPacketCount () const
           Get the total number of packets sent so far.
       uint32 getSendOctetCount () const
           Get the total number of octets (payload only) sent so far.
       uint16 getSequenceNumber () const
           Get the sequence number of the next outgoing packet.
       void setOutQueueCryptoContext (CryptoContext *cc)
           Set output queue CryptoContext.
       void removeOutQueueCryptoContext (CryptoContext *cc)
           Remove output queue CryptoContext.
       CryptoContext * getOutQueueCryptoContext (uint32 ssrc)
           Get an output queue CryptoContext identified by SSRC.

   Protected Member Functions
       OutgoingDataQueue ()
       virtual ~OutgoingDataQueue ()
       void dispatchImmediate (OutgoingRTPPkt *packet)
           This is used to write the RTP data packet to one or more destinations.
       microtimeout_t getSchedulingTimeout ()
           This computes the timeout period for scheduling transmission of the next packet at the
           'head' of the send buffer.
       size_t dispatchDataPacket ()
           This function is used by the service thread to process the next outgoing packet
           pending in the sending queue.
       void setNextSeqNum (uint32 seqNum)
           For thoses cases in which the application requires a method to set the sequence number
           for the outgoing stream (such as for implementing the RTSP PLAY command).
       uint32 getCurrentSeqNum (void)
       void setInitialTimestamp (uint32 ts)
       uint32 getInitialTimestamp ()
       void purgeOutgoingQueue ()
       virtual void setControlPeer (const InetAddress &host, tpport_t port)

   Protected Attributes
       Mutex cryptoMutex
       std::list< CryptoContext * > cryptoContexts

Detailed Description

       A generic outgoing RTP data queue supporting multiple destinations.

       Author:
           Federico Montesino Pouzols fedemp@altern.org

Constructor & Destructor Documentation

   OutgoingDataQueue::OutgoingDataQueue () [protected]
   virtual OutgoingDataQueue::~OutgoingDataQueue () [inline],  [protected],  [virtual]

Member Function Documentation

   void OutgoingDataQueue::addContributor (uint32 csrc)
       Add csrc as the CSRC identifier of a new contributor. This method adds the CSRC identifier
       to a list of contributors that will be inserted in every packet enqueued from now on.

   bool OutgoingDataQueue::addDestination (const InetHostAddress & ia, tpport_t dataPort =
       DefaultRTPDataPort, tpport_t controlPort = 0)
   bool OutgoingDataQueue::addDestination (const InetMcastAddress & ia, tpport_t dataPort =
       DefaultRTPDataPort, tpport_t controlPort = 0)
   size_t OutgoingDataQueue::dispatchDataPacket () [protected]
       This function is used by the service thread to process the next outgoing packet pending in
       the sending queue.

       Returns:
           number of bytes sent. 0 if silent, <0 if error.

   void OutgoingDataQueue::dispatchImmediate (OutgoingRTPPkt * packet) [protected]
       This is used to write the RTP data packet to one or more destinations. It is used by both
       sendImmediate and by dispatchDataPacket.

       Parameters:
           RTP packet to send.

   bool OutgoingDataQueue::forgetDestination (const InetHostAddress & ia, tpport_t dataPort =
       DefaultRTPDataPort, tpport_t controlPort = 0)
   bool OutgoingDataQueue::forgetDestination (const InetMcastAddress & ia, tpport_t dataPort =
       DefaultRTPDataPort, tpport_t controlPort = 0)
   uint32 OutgoingDataQueue::getCurrentSeqNum (void) [inline],  [protected]
   microtimeout_t OutgoingDataQueue::getDefaultExpireTimeout () const [inline]
   microtimeout_t OutgoingDataQueue::getDefaultSchedulingTimeout () const [inline]
   microtimeout_t OutgoingDataQueue::getExpireTimeout () const [inline]
   uint32 OutgoingDataQueue::getInitialTimestamp () [inline],  [protected]
   bool OutgoingDataQueue::getMark () const [inline]
       Get whether the mark bit will be set in the next packet.

   CryptoContext* OutgoingDataQueue::getOutQueueCryptoContext (uint32 ssrc)
       Get an output 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.

   microtimeout_t OutgoingDataQueue::getSchedulingTimeout () [protected]
       This computes the timeout period for scheduling transmission of the next packet at the
       'head' of the send buffer. If no packets are waiting, a default timeout is used. This
       actually forms the 'isPending()' timeout of the rtp receiver in the service thread.

       Returns:
           timeout until next packet is scheduled to send.

   uint32 OutgoingDataQueue::getSendOctetCount () const [inline]
       Get the total number of octets (payload only) sent so far.

       Returns:
           total number of payload octets sent in RTP packets.

   uint32 OutgoingDataQueue::getSendPacketCount () const [inline]
       Get the total number of packets sent so far.

       Returns:
           total number of packets sent

   uint16 OutgoingDataQueue::getSequenceNumber () const [inline]
       Get the sequence number of the next outgoing packet.

       Returns:
           the 16 bit sequence number.

   bool OutgoingDataQueue::isSending () const
       Determine if outgoing packets are waiting to send.

       Returns:
           true if there are packets waiting to be send.

   void OutgoingDataQueue::purgeOutgoingQueue () [protected]
   void OutgoingDataQueue::putData (uint32 stamp, const unsigned char * data = NULL, size_t len =
       0)
       This is used to create a data packet in the send queue. Sometimes a 'NULL' or empty packet
       will be used instead, and these are known as 'silent' packets. 'Silent' packets are used
       simply to 'push' the scheduler along more accurately by giving the appearance that a next
       packet is waiting to be sent and to provide a valid timestamp for that packet.

       Parameters:
           stamp Timestamp for expected send time of packet.
           data Value or NULL if special 'silent' packet.
           len May be 0 to indicate a default by payload type.

       Examples:
           rtpduphello.cpp.

   bool OutgoingDataQueue::removeContributor (uint32 csrc)
       Remove CSRC from the list of contributors.

   void OutgoingDataQueue::removeOutQueueCryptoContext (CryptoContext * cc)
       Remove output queue CryptoContext. The endQueue method (provided by RTPQueue) also deletes
       all registered CryptoContexts.

       Parameters:
           cc Pointer to initialized CryptoContext to remove.

   void OutgoingDataQueue::sendImmediate (uint32 stamp, const unsigned char * data = NULL, size_t
       len = 0)
       This is used to create a data packet and send it immediately. Sometimes a 'NULL' or empty
       packet will be used instead, and these are known as 'silent' packets. 'Silent' packets are
       used simply to 'push' the scheduler along more accurately by giving the appearance that a
       next packet is waiting to be sent and to provide a valid timestamp for that packet.

       Parameters:
           stamp Timestamp immediate send time of packet.
           data Value or NULL if special 'silent' packet.
           len May be 0 to indicate a default by payload type.

   virtual void OutgoingDataQueue::setControlPeer (const InetAddress & host, tpport_t port)
       [inline],  [protected],  [virtual]
       Reimplemented in RTPDuplex.

   void OutgoingDataQueue::setExpireTimeout (microtimeout_t to) [inline]
       Set the 'expired' timer for expiring packets pending in the send queue which have gone
       unsent and are already 'too late' to be sent now.

       Parameters:
           to timeout to expire unsent packets in milliseconds.

       Examples:
           rtpduphello.cpp.

   void OutgoingDataQueue::setInitialTimestamp (uint32 ts) [inline],  [protected]
   void OutgoingDataQueue::setMark (bool mark) [inline]
       Set marker bit for the packet in which the next data provided will be send. When
       transmitting audio, should be set for the first packet of a talk spurt. When transmitting
       video, should be set for the last packet for a video frame.

       Parameters:
           mark Marker bit value for next packet.

   void OutgoingDataQueue::setNextSeqNum (uint32 seqNum) [inline],  [protected]
       For thoses cases in which the application requires a method to set the sequence number for
       the outgoing stream (such as for implementing the RTSP PLAY command).

       Parameters:
           seqNum next sequence number to be used for outgoing packets.

   void OutgoingDataQueue::setOutQueueCryptoContext (CryptoContext * cc)
       Set output queue CryptoContext. The endQueue method (provided by RTPQueue) deletes all
       registered CryptoContexts.

       Parameters:
           cc Pointer to initialized CryptoContext.

   void OutgoingDataQueue::setPadding (uint8 paddinglen) [inline]
       Set padding. All outgoing packets will be transparently padded to a multiple of
       paddinglen.

       Parameters:
           paddinglen pad packets to a length multiple of paddinglen.

   size_t OutgoingDataQueue::setPartial (uint32 timestamp, unsigned char * data, size_t offset,
       size_t max)
       Set partial data for an already queued packet. This is often used for multichannel data.

       Parameters:
           timestamp Timestamp of packet.
           data Buffer to copy from.
           offset Offset to copy from.
           max Maximum data size.

       Returns:
           Number of packet data bytes set.

   void OutgoingDataQueue::setSchedulingTimeout (microtimeout_t to) [inline]
       Set the default scheduling timeout to use when no data packets are waiting to be sent.

       Parameters:
           to timeout in milliseconds.

       Examples:
           rtpduphello.cpp.

Member Data Documentation

   bool OutgoingDataQueue::complete
   std::list<CryptoContext *> OutgoingDataQueue::cryptoContexts [protected]
   Mutex OutgoingDataQueue::cryptoMutex [mutable],  [protected]
   bool OutgoingDataQueue::marked
   uint32 OutgoingDataQueue::octetCount
   timeval OutgoingDataQueue::overflowTime
   uint32 OutgoingDataQueue::packetCount
   uint8 OutgoingDataQueue::paddinglen
   uint16 OutgoingDataQueue::sendCC
   uint16 OutgoingDataQueue::sendSeq
   uint32 OutgoingDataQueue::sendSources[16]

Author

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