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CSdpMediaField Class Reference

class CSdpMediaField : public CBase

This class encapsulates the media description field and related media specific subfields of the Session Description Protocol.

The normative reference for correct formatting and values is draft-ietf-mmusic-sdp-new-14 unless specified otherwise in member documentation. The implementation supports this normative reference, but does not enforce it fully.

sdpcodec.lib

Inherits from

CSdpMediaField
- CBase

Public Member Functions
	~CSdpMediaField ()
IMPORT_C RPointerArray < CSdpAttributeField > &	AttributeFields ()
IMPORT_C RPointerArray < CSdpBandwidthField > &	BandwidthFields ()
IMPORT_C CSdpMediaField *	CloneL ( TBool )
IMPORT_C RPointerArray < CSdpConnectionField > &	ConnectionFields ()
IMPORT_C CSdpMediaField *	DecodeL (const TDesC8 &, TBool )
IMPORT_C CSdpMediaField *	DecodeLC (const TDesC8 &, TBool )
IMPORT_C void	EncodeL ( RWriteStream &, TBool )
void	ExternalizeL ( RWriteStream &)
IMPORT_C RPointerArray < CSdpFmtAttributeField > &	FormatAttributeFields ()
IMPORT_C const TDesC8 &	FormatList ()
IMPORT_C const TDesC8 &	Info ()
CSdpMediaField *	InternalizeL ( RReadStream &)
TBool	IsContactPresent ()
IMPORT_C TBool	IsValid ()
IMPORT_C void	KeepFormatL (const TDesC8 &)
IMPORT_C CSdpKeyField *	Key ()
IMPORT_C const CSdpKeyField *	Key ()
IMPORT_C RStringF	Media ()
IMPORT_C CSdpMediaField *	NewL ( RStringF , TUint , RStringF , const TDesC8 &)
IMPORT_C CSdpMediaField *	NewLC ( RStringF , TUint , RStringF , const TDesC8 &)
IMPORT_C TUint	Port ()
IMPORT_C TUint	PortCount ()
IMPORT_C RStringF	Protocol ()
IMPORT_C void	RejectMedia ()
IMPORT_C void	RemoveFormatL (const TDesC8 &)
IMPORT_C void	SetFormatListL (const TDesC8 &)
IMPORT_C void	SetInfoL (const TDesC8 &)
IMPORT_C void	SetKey ( CSdpKeyField *)
IMPORT_C void	SetMediaL ( RStringF )
IMPORT_C void	SetPortCountL ( TUint )
IMPORT_C void	SetPortL ( TUint )
IMPORT_C void	SetProtocolL ( RStringF )
IMPORT_C TBool	operator== (const CSdpMediaField &)

Private Member Functions
	CSdpMediaField ()
	CSdpMediaField (const CSdpMediaField &)
void	ConstructL ()
void	ConstructL ( TBool )
void	ConstructL ( RStringF , TUint , RStringF , const TDesC8 &)
void	ConstructL (const CSdpMediaField &)
void	DoInternalizeL ( RReadStream &)
TDesC8 &	GetTokenFromStreamL ( RReadStream &)
void	ParseAttributeFieldsL ()
void	ParseBandwithL ()
void	ParseConnectionL ()
void	ParseEncryptionKeyL ()
void	ParseInformationL ()
void	ParseL (const TDesC8 &)
void	ParseMediaL ()
CSdpMediaField &	operator= (const CSdpMediaField &)

Inherited Functions
	CBase::CBase()
	CBase::Delete(CBase *)
	CBase::Extension_(TUint,TAny &,TAny )
	CBase::operator new(TUint)
	CBase::operator new(TUint,TAny *)
	CBase::operator new(TUint,TLeave)
	CBase::operator new(TUint,TLeave,TUint)
	CBase::operator new(TUint,TUint)
	CBase::~CBase()

Private Attributes
RPointerArray < CSdpAttributeField > *	iAttributeFields
RPointerArray < CSdpBandwidthField > *	iBandwidthFields
RPointerArray < CSdpConnectionField > *	iConnectionFields
RArray < TPtrC8 >	iElementArray
RPointerArray < CSdpFmtAttributeField > *	iFmtAttrFields
HBufC8 *	iFormatList
HBufC8 *	iInfo
RStringF	iMedia
RStringPool	iPool
TUint	iPort
TUint	iPortCount
RStringF	iProtocol
TBool	iRecurse
CSdpCodecParseUtil *	iSdpCodecParseUtil
CSdpKeyField *	iSdpKeyField
HBufC8 *	iToken

Constructor & Destructor Documentation

CSdpMediaField()

CSdpMediaField

(

)

[private]

CSdpMediaField(const CSdpMediaField &)

CSdpMediaField

(

const CSdpMediaField &

)

[private]

Parameters

const CSdpMediaField &

~CSdpMediaField()

IMPORT_C

~CSdpMediaField

(

)

Deletes the resources held by the instance.

Member Functions Documentation

AttributeFields()

IMPORT_C RPointerArray < CSdpAttributeField > &

AttributeFields

(

)

Gets the set of media level, format independent attributes. This array is used directly for element insertion and removal.

The objects referenced from the array are owned by the media field instance and must not be deleted. An object can be removed from the media description by setting the corresponding element to zero. By doing so, the calling party receives ownership of the removed object.

BandwidthFields()

IMPORT_C RPointerArray < CSdpBandwidthField > &

BandwidthFields

(

)

Gets the set of media level bandwidth fields. This array is used directly for element insertion and removal.

CloneL(TBool)

IMPORT_C CSdpMediaField *

CloneL

(

TBool

aRecurse = ETrue

)

const

Creates a new instance that is equal to the target. Optionally also related subfields are cloned.

Parameters

TBool aRecurse = ETrue

Flag to specify whether to clone subfields also (ETrue) or only the media field (EFalse).

ConnectionFields()

IMPORT_C RPointerArray < CSdpConnectionField > &

ConnectionFields

(

)

Gets the set of media level connection fields. This array is used directly for element insertion and removal.

ConstructL()

void

ConstructL

(

)

[private]

ConstructL(TBool)

void

ConstructL

(

TBool

aRecurse

)

[private]

Parameters

TBool aRecurse

ConstructL(RStringF, TUint, RStringF, const TDesC8 &)

void	ConstructL	(	RStringF	aMedia,
			TUint	aPort,
			RStringF	aProtocol,
			const TDesC8 &	aFormatList
		)	[private]

Parameters

RStringF aMedia
TUint aPort
RStringF aProtocol
const TDesC8 & aFormatList

ConstructL(const CSdpMediaField &)

void

ConstructL

(

const CSdpMediaField &

aSdpMediaField

)

[private]

Parameters

const CSdpMediaField & aSdpMediaField

DecodeL(const TDesC8 &, TBool)

IMPORT_C CSdpMediaField *	DecodeL	(	const TDesC8 &	aText,
			TBool	aRecurse = ETrue
		)	[static]

Constructs a new media description field.

Parameters

const TDesC8 & aText	A correctly formatted media field terminated by a CRLF followed by zero or more media attribute fields separated by a CRLF.
TBool aRecurse = ETrue	If ETrue, attempts to construct also media attributes following the CRLF terminating the media field.

DecodeLC(const TDesC8 &, TBool)

IMPORT_C CSdpMediaField *	DecodeLC	(	const TDesC8 &	aText,
			TBool	aRecurse = ETrue
		)	[static]

Constructs a new media description field and adds the pointer to the cleanup stack.

Parameters

const TDesC8 & aText	A correctly formatted media field terminated by a CRLF followed by zero or more media attribute fields separated by a CRLF.
TBool aRecurse = ETrue	If ETrue, attempts to construct also media attributes following the CRLF terminating the media field.

DoInternalizeL(RReadStream &)

void

DoInternalizeL

(

RReadStream &

aStream

)

[private]

Parameters

RReadStream & aStream

EncodeL(RWriteStream &, TBool)

IMPORT_C void	EncodeL	(	RWriteStream &	aStream,
			TBool	aRecurse = ETrue
		)	const

Outputs the field formatted according to SDP syntax and including the terminating CRLF. Optionally output also the related media level fields.

Parameters

RWriteStream & aStream	Stream used for output. On return the stream includes correctly formatted media field with media part fields if aRecurse is defined to ETrue.
TBool aRecurse = ETrue	Flag to specify whether to output media attributes also (ETrue) or only the media field (EFalse).

ExternalizeL(RWriteStream &)

void

ExternalizeL

(

RWriteStream &

aStream

)

const

Externalizes the object to stream

Parameters

RWriteStream & aStream

Stream where the object's state will be stored

FormatAttributeFields()

IMPORT_C RPointerArray < CSdpFmtAttributeField > &

FormatAttributeFields

(

)

Gets the set of media format level attributes. This array is used directly for element insertion and removal.

FormatList()

IMPORT_C const TDesC8 &

FormatList

(

)

const

Gets the format list.

GetTokenFromStreamL(RReadStream &)

TDesC8 &

GetTokenFromStreamL

(

RReadStream &

aStream

)

[private]

Parameters

RReadStream & aStream

Info()

IMPORT_C const TDesC8 &

Info

(

)

const

Return the media level info field value.

InternalizeL(RReadStream &)

CSdpMediaField *

InternalizeL

(

RReadStream &

aStream

)

[static]

Creates object from the stream data

Parameters

RReadStream & aStream

Stream where the object's state will be read

IsContactPresent()

TBool

IsContactPresent

(

)

const

Shows if contact is present

IsValid()

IMPORT_C TBool

IsValid

(

)

const

Checks the consistency between the media field and it's subfields. In particular, this function checks that each format specific attribute is related to a format in the format list of the media field.

KeepFormatL(const TDesC8 &)

IMPORT_C void

KeepFormatL

(

const TDesC8 &

aFormat

)

Removes all formats except one from the media description. The function will set the format list to only contain the one format to keep and then delete all format level attributes that are related to the removed formats. If the format is not found from the format list, it is added there. If there are no format level attributes for the specified format, the format level attribute set will be empty.

Parameters

const TDesC8 & aFormat

The name of the format to keep after removing all others.

Key()

IMPORT_C CSdpKeyField *

Key

(

)

Gets the media level encryption key field. Note, that the ownership is not transferred and the instance must not be deleted by the caller.

Key()

IMPORT_C const CSdpKeyField *

Key

(

)

const

Gets the media level encryption key field.

Media()

IMPORT_C RStringF

Media

(

)

const

Gets the media type.

NewL(RStringF, TUint, RStringF, const TDesC8 &)

IMPORT_C CSdpMediaField *	NewL	(	RStringF	aMedia,
			TUint	aPort,
			RStringF	aProtocol,
			const TDesC8 &	aFormatList
		)	[static]

Constructs a new media description field. The optional portcount component of the field is initialized to 1.

Parameters

RStringF aMedia	A valid media type name.
TUint aPort	Port number.
RStringF aProtocol	A valid media protocol name.
const TDesC8 & aFormatList	A valid format list.

NewLC(RStringF, TUint, RStringF, const TDesC8 &)

IMPORT_C CSdpMediaField *	NewLC	(	RStringF	aMedia,
			TUint	aPort,
			RStringF	aProtocol,
			const TDesC8 &	aFormatList
		)	[static]

Constructs a new media description field and adds the pointer to the cleanup stack. The optional portcount component of the field is initialized to 1.

Parameters

RStringF aMedia	A valid media type name.
TUint aPort	Port number.
RStringF aProtocol	A valid media protocol name.
const TDesC8 & aFormatList	A valid format list.

ParseAttributeFieldsL()

void

ParseAttributeFieldsL

(

)

[private]

ParseBandwithL()

void

ParseBandwithL

(

)

[private]

ParseConnectionL()

void

ParseConnectionL

(

)

[private]

ParseEncryptionKeyL()

void

ParseEncryptionKeyL

(

)

[private]

ParseInformationL()

void

ParseInformationL

(

)

[private]

ParseL(const TDesC8 &)

void

ParseL

(

const TDesC8 &

aText

)

[private]

Parameters

const TDesC8 & aText

ParseMediaL()

void

ParseMediaL

(

)

[private]

Port()

IMPORT_C TUint

Port

(

)

const

Gets the port number.

PortCount()

IMPORT_C TUint

PortCount

(

)

const

Gets the port count.

Protocol()

IMPORT_C RStringF

Protocol

(

)

const

Gets the media protocol.

RejectMedia()

IMPORT_C void

RejectMedia

(

)

Sets this media description into rejected state. The rejected state is defined by the offer/answer model in RFC3264. The function sets the port number to 0 and removes all formats except one. The remaining format is determined by the implementation.

RemoveFormatL(const TDesC8 &)

IMPORT_C void

RemoveFormatL

(

const TDesC8 &

aFormat

)

Removes a specific format from the media description. The function will remove the named format from the format list if found and then delete all format level attributes of type CSdpFmtAttributeField related to the removed format.

Parameters

const TDesC8 & aFormat

The name of the format to remove.

SetFormatListL(const TDesC8 &)

IMPORT_C void

SetFormatListL

(

const TDesC8 &

aValue

)

Sets the format list. The format list should contain one or more format tokens separated by a single whitespace character.

leave: KErrSdpCodecMediaField if aValue contains invalid tokens

Parameters

const TDesC8 & aValue

A valid format list.

SetInfoL(const TDesC8 &)

IMPORT_C void

SetInfoL

(

const TDesC8 &

aValue

)

Sets the media level info field value.

leave: KErrSdpCodecMediaInfoField if aValue is not KNullDesC8 or aValue includes invalid byte strings ( , , ).

Parameters

const TDesC8 & aValue

A valid info field value.

SetKey(CSdpKeyField *)

IMPORT_C void

SetKey

(

CSdpKeyField *

aObj

)

Sets or removes the media level encryption key field.

Parameters

CSdpKeyField * aObj

The new key field or null if field is to be removed. Ownership of the referenced object is transferred to the media field instance.

SetMediaL(RStringF)

IMPORT_C void

SetMediaL

(

RStringF

aMedia

)

Sets the media type.

leave: KErrSdpCodecMediaField if aMedia is not valid character

Parameters

RStringF aMedia

The media type.

SetPortCountL(TUint)

IMPORT_C void

SetPortCountL

(

TUint

aCount

)

Sets the port count.

leave: KErrSdpCodecMediaField if aCount equals to zero.

Parameters

TUint aCount

The port count that must be greater than zero.

SetPortL(TUint)

IMPORT_C void

SetPortL

(

TUint

aPort

)

Sets the port number.

leave: KErrSdpCodecMediaField if port is not valid number as defined in draft-ietf-mmusic-sdp-new-14

Parameters

TUint aPort

The port number.

SetProtocolL(RStringF)

IMPORT_C void

SetProtocolL

(

RStringF

aProtocol

)

Sets the media protocol.

leave: KErrSdpCodecMediaField if aProtocol containing two elements divided by slash are not valid tokens.

Parameters

RStringF aProtocol

The media protocol.

operator=(const CSdpMediaField &)

CSdpMediaField &

operator=

(

const CSdpMediaField &

)

[private]

Parameters

const CSdpMediaField &

operator==(const CSdpMediaField &)

IMPORT_C TBool

operator==

(

const CSdpMediaField &

aObj

)

const

Compares this instance to another for equality. Subfields are included in the comparison if present.

Parameters

const CSdpMediaField & aObj

The instance to compare to.

Member Data Documentation

RPointerArray< CSdpAttributeField > * iAttributeFields

RPointerArray < CSdpAttributeField > *

iAttributeFields

[private]

RPointerArray< CSdpBandwidthField > * iBandwidthFields

RPointerArray < CSdpBandwidthField > *

iBandwidthFields

[private]

RPointerArray< CSdpConnectionField > * iConnectionFields

RPointerArray < CSdpConnectionField > *

iConnectionFields

[private]

RArray< TPtrC8 > iElementArray

RArray < TPtrC8 >

iElementArray

[private]

RPointerArray< CSdpFmtAttributeField > * iFmtAttrFields

RPointerArray < CSdpFmtAttributeField > *

iFmtAttrFields

[private]

HBufC8 * iFormatList

HBufC8 *

iFormatList

[private]

HBufC8 * iInfo

HBufC8 *

iInfo

[private]

RStringF iMedia

RStringF

iMedia

[private]

RStringPool iPool

RStringPool

iPool

[private]

TUint iPort

TUint

iPort

[private]

TUint iPortCount

TUint

iPortCount

[private]

RStringF iProtocol

RStringF

iProtocol

[private]

TBool iRecurse

TBool

iRecurse

[private]

CSdpCodecParseUtil * iSdpCodecParseUtil

CSdpCodecParseUtil *

iSdpCodecParseUtil

[private]

CSdpKeyField * iSdpKeyField

CSdpKeyField *

iSdpKeyField

[private]

HBufC8 * iToken

HBufC8 *

iToken

[private]