H323_T120Channel Class Reference

#include <h323t120.h>

Inheritance diagram for H323_T120Channel:

Collaboration diagram for H323_T120Channel:

Public Member Functions
virtual void	HandleChannel ()
Construction
	H323_T120Channel (H323Connection &connection, const H323Capability &capability, Directions direction, unsigned sessionID)
Overrides from class H323Channel
virtual void	Receive ()
virtual void	Transmit ()
virtual PBoolean	OnSendingPDU (H245_OpenLogicalChannel &openPDU) const
virtual void	OnSendOpenAck (const H245_OpenLogicalChannel &open, H245_OpenLogicalChannelAck &ack) const
virtual PBoolean	OnReceivedPDU (const H245_OpenLogicalChannel &pdu, unsigned &errorCode)
virtual PBoolean	OnReceivedAckPDU (const H245_OpenLogicalChannelAck &pdu)
Public Member Functions inherited from H323DataChannel
	H323DataChannel (H323Connection &connection, const H323Capability &capability, Directions direction, unsigned sessionID)
	~H323DataChannel ()
virtual unsigned	GetSessionID () const
virtual PBoolean	CreateListener ()
virtual PBoolean	CreateTransport ()
Public Member Functions inherited from H323UnidirectionalChannel
	H323UnidirectionalChannel (H323Connection &connection, const H323Capability &capability, Directions direction)
	~H323UnidirectionalChannel ()
virtual Directions	GetDirection () const
virtual PBoolean	SetInitialBandwidth ()
virtual bool	PreOpen ()
virtual PBoolean	Open ()
virtual bool	UpdateMediaFormat (const OpalMediaFormat &mediaFormat)
	Update media format options. More...
virtual OpalMediaStreamPtr	GetMediaStream () const
virtual void	SetMediaStream (OpalMediaStreamPtr mediaStream)
Public Member Functions inherited from H323Channel
	H323Channel (H323Connection &connection, const H323Capability &capability)
	~H323Channel ()
virtual void	PrintOn (ostream &strm) const
const H323ChannelNumber &	GetNumber () const
void	SetNumber (const H323ChannelNumber &num)
const H323ChannelNumber &	GetReverseChannel () const
void	SetReverseChannel (const H323ChannelNumber &num)
OpalBandwidth	GetBandwidthUsed () const
bool	SetBandwidthUsed (OpalBandwidth bandwidth)
const H323Capability &	GetCapability () const
OpalMediaFormat	GetMediaFormat () const
	Get the media format (from capability) More...
virtual bool	SetSessionID (unsigned sessionID)
virtual PBoolean	GetMediaTransportAddress (OpalTransportAddress &data, OpalTransportAddress &control) const
virtual void	Close ()
PBoolean	IsOpen () const
virtual void	OnFlowControl (long bitRateRestriction)
virtual void	OnMiscellaneousCommand (const H245_MiscellaneousCommand_type &type)
virtual void	OnMiscellaneousIndication (const H245_MiscellaneousIndication_type &type)
virtual void	OnJitterIndication (DWORD jitter, int skippedFrameCount, int additionalBuffer)

Protected Attributes
OpalT120Protocol *	t120handler
Protected Attributes inherited from H323DataChannel
unsigned	sessionID
H323Listener *	listener
PBoolean	autoDeleteListener
H323Transport *	transport
PBoolean	autoDeleteTransport
PBoolean	separateReverseChannel
Protected Attributes inherited from H323UnidirectionalChannel
bool	receiver
OpalMediaStreamPtr	m_mediaStream
Protected Attributes inherited from H323Channel
H323EndPoint &	endpoint
H323Connection &	connection
H323Capability *	capability
H323ChannelNumber	number
H323ChannelNumber	reverseChannel
bool	opened
PAtomicInteger	m_terminating

Additional Inherited Members
Public Types inherited from H323Channel
enum	Directions { IsBidirectional, IsTransmitter, IsReceiver, NumDirections }
Protected Member Functions inherited from H323DataChannel
virtual void	InternalClose ()

Detailed Description

This class describes the T.120 logical channel.

Constructor & Destructor Documentation

H323_T120Channel::H323_T120Channel	(	H323Connection &	connection,
		const H323Capability &	capability,
		Directions	direction,
		unsigned	sessionID
	)

Create a new channel.

Parameters

connection	Connection to endpoint for channel
capability	Capability channel is using
direction	Direction of channel
sessionID	Session ID for channel

Member Function Documentation

virtual void H323_T120Channel::HandleChannel ( )

virtual

virtual PBoolean H323_T120Channel::OnReceivedAckPDU ( const H245_OpenLogicalChannelAck &  pdu )

virtual

This is called after a request to create a channel occurs from the local machine via the H245LogicalChannelDict::Open() function, and the request has been acknowledged by the remote endpoint.

The default makes sure the parameters are compatible and passes on the PDU to the rtp session.

Parameters

pdu	Acknowledgement PDU

Reimplemented from H323DataChannel.

virtual PBoolean H323_T120Channel::OnReceivedPDU ( const H245_OpenLogicalChannel &  pdu, unsigned &  errorCode  )

virtual

This is called after a request to create a channel occurs from the local machine via the H245LogicalChannelDict::Open() function, and the request has been acknowledged by the remote endpoint.

The default makes sure the parameters are compatible and passes on the PDU to the rtp session.

Parameters

pdu	Open PDU
errorCode	Error code on failure

Reimplemented from H323DataChannel.

virtual PBoolean H323_T120Channel::OnSendingPDU ( H245_OpenLogicalChannel &  openPDU ) const

virtual

Fill out the OpenLogicalChannel PDU for the particular channel type.

Parameters

openPDU

Open PDU to send.

Reimplemented from H323DataChannel.

virtual void H323_T120Channel::OnSendOpenAck ( const H245_OpenLogicalChannel &  open, H245_OpenLogicalChannelAck &  ack  ) const

virtual

This is called when request to create a channel is received from a remote machine and is about to be acknowledged.

Parameters

open	Open PDU
ack	Acknowledgement PDU

Reimplemented from H323DataChannel.

virtual void H323_T120Channel::Receive ( )

virtual

Handle channel data reception.

This is called by the thread started by the Start() function and is typically a loop reading from the transport and handling PDU's.

The default behaviour here is to call HandleChannel()

virtual void H323_T120Channel::Transmit ( )

virtual

Handle channel data transmission.

This is called by the thread started by the Start() function and is typically a loop reading from the codec and writing to the transport (eg an RTP_session).

The default behaviour here is to call HandleChannel()

Field Documentation

OpalT120Protocol* H323_T120Channel::t120handler

protected

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

• h323t120.h