H323AudioCapability Class Reference

#include <h323caps.h>

Inheritance diagram for H323AudioCapability:

H323RealTimeCapability H323Capability H323_G711Capability H323_G7231Capability H323_G728Capability H323_G729Capability H323_GSM0610Capability H323NonStandardAudioCapability H323_G726_Capability H323_iLBC_Capability H323_LPC10Capability MicrosoftNonStandardAudioCapability SpeexNonStandardAudioCapability MicrosoftGSMAudioCapability MicrosoftIMAAudioCapability SpeexNarrow2AudioCapability SpeexNarrow3AudioCapability SpeexNarrow4AudioCapability SpeexNarrow5AudioCapability SpeexNarrow6AudioCapability SpeexWide6AudioCapability List of all members.

Public Member Functions

Construction
 H323AudioCapability ()
Identification functions
virtual MainTypes GetMainType () const
Operations
virtual unsigned GetDefaultSessionID () const
virtual void SetTxFramesInPacket (unsigned frames)
virtual unsigned GetTxFramesInPacket () const
virtual unsigned GetRxFramesInPacket () const
Protocol manipulation
virtual BOOL OnSendingPDU (H245_Capability &pdu) const
virtual BOOL OnSendingPDU (H245_DataType &pdu) const
virtual BOOL OnSendingPDU (H245_ModeElement &pdu) const
virtual BOOL OnSendingPDU (H245_AudioCapability &pdu, unsigned packetSize) const
virtual BOOL OnSendingPDU (H245_AudioMode &pdu) const
virtual BOOL OnReceivedPDU (const H245_Capability &pdu)
virtual BOOL OnReceivedPDU (const H245_DataType &pdu, BOOL receiver)
virtual BOOL OnReceivedPDU (const H245_AudioCapability &pdu, unsigned &packetSize)

Detailed Description

This class describes the interface to an audio codec used to transfer data via the logical channels opened and managed by the H323 control channel.

An application may create a descendent off this class and override functions as required for descibing the codec.


Constructor & Destructor Documentation

H323AudioCapability::H323AudioCapability (  ) 

Create an audio based capability.


Member Function Documentation

virtual unsigned H323AudioCapability::GetDefaultSessionID (  )  const [virtual]

Get the default RTP session. This function gets the default RTP session ID for the capability type. For example audio capabilities return the value RTP_Session::DefaultAudioSessionID etc.

The default behaviour returns zero, indicating it is not an RTP based capability.

Reimplemented from H323Capability.

virtual MainTypes H323AudioCapability::GetMainType (  )  const [virtual]

Get the main type of the capability. Always returns e_Audio.

Implements H323Capability.

virtual unsigned H323AudioCapability::GetRxFramesInPacket (  )  const [virtual]

Get the maximum size (in frames) of data that can be received in a single PDU.

The default behaviour sends the rxFramesInPacket variable.

Reimplemented from H323Capability.

virtual unsigned H323AudioCapability::GetTxFramesInPacket (  )  const [virtual]

Get the maximum size (in frames) of data that will be transmitted in a single PDU.

The default behaviour sends the txFramesInPacket variable.

Reimplemented from H323Capability.

virtual BOOL H323AudioCapability::OnReceivedPDU ( const H245_AudioCapability pdu,
unsigned &  packetSize 
) [virtual]

This function is called whenever and incoming TerminalCapabilitySet or OpenLogicalChannel PDU has been used to construct the control channel. It allows the capability to set from the PDU fields, information in members specific to the class.

The default behaviour assumes the pdu is an integer number of frames per packet.

Parameters:
pdu  PDU to get information from
packetSize  Packet size to use in capability

Reimplemented in H323_G726_Capability, H323NonStandardAudioCapability, H323_G7231Capability, and H323_GSM0610Capability.

virtual BOOL H323AudioCapability::OnReceivedPDU ( const H245_DataType pdu,
BOOL  receiver 
) [virtual]

This function is called whenever and incoming OpenLogicalChannel PDU has been used to construct the control channel. It allows the capability to set from the PDU fields, information in members specific to the class.

The default behaviour calls the OnReceivedPDU() that takes a H245_AudioCapability and clamps the txFramesInPacket or rxFramesInPacket.

Parameters:
pdu  PDU to get information from
receiver  Is receiver OLC

Implements H323Capability.

virtual BOOL H323AudioCapability::OnReceivedPDU ( const H245_Capability pdu  )  [virtual]

This function is called whenever and incoming TerminalCapabilitySet PDU is received on the control channel, and a new H323Capability descendent was created. This completes reading fields from the PDU into the classes members.

If the function returns FALSE then the received PDU codec description is not supported, so will be ignored.

The default behaviour calls the OnReceivedPDU() that takes a H245_AudioCapability and clamps the txFramesInPacket.

Parameters:
pdu  PDU to get information from

Reimplemented from H323Capability.

virtual BOOL H323AudioCapability::OnSendingPDU ( H245_AudioMode pdu  )  const [virtual]

This function is called whenever and outgoing RequestMode PDU is being constructed for the control channel. It allows the capability to set the PDU fields from information in members specific to the class.

The default behaviour sets the PDUs tag according to the GetSubType() function (translated to different enum).

Parameters:
pdu  PDU to set information on

Reimplemented in H323NonStandardAudioCapability.

virtual BOOL H323AudioCapability::OnSendingPDU ( H245_AudioCapability pdu,
unsigned  packetSize 
) const [virtual]

This function is called whenever and outgoing TerminalCapabilitySet or OpenLogicalChannel PDU is being constructed for the control channel. It allows the capability to set the PDU fields from information in members specific to the class.

The default behaviour assumes the pdu is an integer number of frames per packet.

Parameters:
pdu  PDU to set information on
packetSize  Packet size to use in capability

Reimplemented in H323_G726_Capability, H323NonStandardAudioCapability, H323_G7231Capability, and H323_GSM0610Capability.

virtual BOOL H323AudioCapability::OnSendingPDU ( H245_ModeElement pdu  )  const [virtual]

This function is called whenever and outgoing RequestMode PDU is being constructed for the control channel. It allows the capability to set the PDU fields from information in members specific to the class.

The default behaviour calls the OnSendingPDU() function with a more specific PDU type.

Parameters:
pdu  PDU to set information on

Implements H323Capability.

virtual BOOL H323AudioCapability::OnSendingPDU ( H245_DataType pdu  )  const [virtual]

This function is called whenever and outgoing OpenLogicalChannel PDU is being constructed for the control channel. It allows the capability to set the PDU fields from information in members specific to the class.

The default behaviour calls the OnSendingPDU() function with a more specific PDU type.

Parameters:
pdu  PDU to set information on

Implements H323Capability.

virtual BOOL H323AudioCapability::OnSendingPDU ( H245_Capability pdu  )  const [virtual]

This function is called whenever and outgoing TerminalCapabilitySet PDU is being constructed for the control channel. It allows the capability to set the PDU fields from information in members specific to the class.

The default behaviour calls the OnSendingPDU() function with a more specific PDU type.

Parameters:
pdu  PDU to set information on

Implements H323Capability.

virtual void H323AudioCapability::SetTxFramesInPacket ( unsigned  frames  )  [virtual]

Set the maximum size (in frames) of data that will be transmitted in a single PDU.

This will also be the desired number that will be sent by most codec implemetations.

The default behaviour sets the txFramesInPacket variable.

Parameters:
frames  Number of frames per packet

Reimplemented from H323Capability.

Reimplemented in MicrosoftGSMAudioCapability, and H323_GSM0610Capability.


The documentation for this class was generated from the following file:
Generated on Mon Sep 25 16:21:28 2006 for OPAL by  doxygen 1.4.7