IAX2SequenceNumbers Class Reference

#include <remote.h>

Collaboration diagram for IAX2SequenceNumbers:

Public Types
enum	IncomingOrder { InSequence, SkippedFrame, RepeatedFrame }

Public Member Functions
	IAX2SequenceNumbers ()
virtual	~IAX2SequenceNumbers ()
void	ZeroAllValues ()
PINDEX	InSeqNo ()
PINDEX	OutSeqNo ()
PBoolean	IsFirstReplyFrame ()
PBoolean	IsSequenceNosZero ()
void	SetInSeqNo (PINDEX newVal)
void	SetOutSeqNo (PINDEX newVal)
void	SetInOutSeqNo (PINDEX inVal, PINDEX outVal)
void	SetAckSequenceInfo (IAX2SequenceNumbers &other)
PBoolean	operator!= (IAX2SequenceNumbers &other)
PBoolean	operator== (IAX2SequenceNumbers &other)
void	MassageSequenceForSending (IAX2FullFrame &src)
void	WrapAroundFrameSequence (IAX2SequenceNumbers &src)
IncomingOrder	IncomingMessageInOrder (IAX2FullFrame &src)
void	CopyContents (IAX2SequenceNumbers &src)
PString	AsString () const
virtual void	PrintOn (ostream &strm) const
PBoolean	IsFirstReply ()
void	AddWrapAroundValue (PINDEX newOffset)

Protected Types
enum	sequenceDefines { minSpacing = 3 }

Protected Attributes
PINDEX	inSeqNo
PINDEX	outSeqNo
PMutex	mutex
PINDEX	lastSentTimeStamp
IAX2PacketIdList	receivedLog

Detailed Description

A structure to hold incoming and outgoing sequence numbers

Member Enumeration Documentation

enum IAX2SequenceNumbers::IncomingOrder

An enum to describe incoming frame. The incoming frame may be on time (perfect sequence numbers) repeated (we have already seen it before) or out of order (a frame is skipped).

Enumerator
InSequence	perfect sequence number
SkippedFrame	there is a missing frame, a VNAK condition
RepeatedFrame	we have already seen this frame...

enum IAX2SequenceNumbers::sequenceDefines

protected

An enum to contain the various defines required by this clsss

Enumerator
minSpacing	minimum spacing in ms for the time stamp of full frames

Constructor & Destructor Documentation

IAX2SequenceNumbers::IAX2SequenceNumbers ( )

inline

Constructor, which sets the in and out sequence numbers to zero

References ZeroAllValues().

virtual IAX2SequenceNumbers::~IAX2SequenceNumbers ( )

inlinevirtual

Destructor, which is provided as this class contains virtual methods

Member Function Documentation

void IAX2SequenceNumbers::AddWrapAroundValue

(

PINDEX

newOffset

)

Add an offset to the inSeqNo and outSeqNo variables

PString IAX2SequenceNumbers::AsString

(

)

const

Report the contents as a string

void IAX2SequenceNumbers::CopyContents

(

IAX2SequenceNumbers &

src

)

Copy the sequence info from the source argument to this class

IncomingOrder IAX2SequenceNumbers::IncomingMessageInOrder

(

IAX2FullFrame &

src

)

We have received a message from the remote node. Check sequence numbers are ok. reply with the appropriate enum to describe if the incoming frame is early, late, or on time

PINDEX IAX2SequenceNumbers::InSeqNo

(

)

Read the incoming sequence number

PBoolean IAX2SequenceNumbers::IsFirstReply ( )

inline

Report true if this sequnece info is the very first packet received from a remote node, where we have initiated the call

References inSeqNo, and outSeqNo.

PBoolean IAX2SequenceNumbers::IsFirstReplyFrame

(

)

Report true if the frame has inSeqNo and outSeqNo of 1 and 0 respectively, indicating this is a reply to a new frame (could be an ack, accept frame)

PBoolean IAX2SequenceNumbers::IsSequenceNosZero

(

)

Report if the sequences numbers (in and out) are both Zero. This is the case for some frames (new, invalid)

void IAX2SequenceNumbers::MassageSequenceForSending

(

IAX2FullFrame &

src

)

Increment this sequences outSeqNo, and assign the results to the source arg

PBoolean IAX2SequenceNumbers::operator!=

(

IAX2SequenceNumbers &

other

)

Comparison operator - tests if sequence numbers are different

PBoolean IAX2SequenceNumbers::operator==

(

IAX2SequenceNumbers &

other

)

Comparison operator - tests if sequence numbers are equal

PINDEX IAX2SequenceNumbers::OutSeqNo

(

)

Read the outgoing sequence number

virtual void IAX2SequenceNumbers::PrintOn ( ostream &  strm ) const

virtual

Pretty print in and out sequence numbers to the designated stream

void IAX2SequenceNumbers::SetAckSequenceInfo

(

IAX2SequenceNumbers &

other

)

Assign the sequence nos as appropropriate for when we are sending a sequence set in a ack frame

void IAX2SequenceNumbers::SetInOutSeqNo	(	PINDEX	inVal,
		PINDEX	outVal
	)

Assign a new value to the seq.in and seq.out, which is used prior to sending a frame

void IAX2SequenceNumbers::SetInSeqNo

(

PINDEX

newVal

)

Assign new value to the in (or expected) seq number

void IAX2SequenceNumbers::SetOutSeqNo

(

PINDEX

newVal

)

Assign a new value to the sequence number used for outgoing frames

void IAX2SequenceNumbers::WrapAroundFrameSequence

(

IAX2SequenceNumbers &

src

)

Take the incoming frame, and increment seq nos by some multiple of 256 to bring them into line with the current values. Use the wrapAound member variable to do this.

void IAX2SequenceNumbers::ZeroAllValues

(

)

Initialise to Zero values

Referenced by IAX2SequenceNumbers().

Field Documentation

PINDEX IAX2SequenceNumbers::inSeqNo

protected

Packet number (next incoming expected)

Referenced by IsFirstReply().

PINDEX IAX2SequenceNumbers::lastSentTimeStamp

protected

Last sent time stamp - ensure 3 ms gap between time stamps.

PMutex IAX2SequenceNumbers::mutex

protected

Mutex to protect access to this structrue while doing seqno changes

PINDEX IAX2SequenceNumbers::outSeqNo

protected

Packet number (outgoing)

Referenced by IsFirstReply().

IAX2PacketIdList IAX2SequenceNumbers::receivedLog

protected

Dictionary of timestamp and OutSeqNo for frames received by this iax device

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The documentation for this class was generated from the following file:

• remote.h