QtsAbstractDescriptor Class Reference

Abstract base class for MPEG PSI/SI descriptors. More...

Inheritance diagram for QtsAbstractDescriptor:

Public Member Functions
virtual	~QtsAbstractDescriptor ()
	Virtual destructor. More...
virtual bool	deserialize (const QtsDescriptor &descriptor)=0
	This abstract method deserializes a binary descriptor. More...
void	invalidate ()
	Invalidate the descriptor. More...
bool	isValid () const
	Check if the descriptor is valid. More...
virtual bool	serialize (QtsDescriptor &descriptor) const =0
	This abstract method serializes a descriptor. More...
QtsDescTag	tag () const
	Get the descriptor tag. More...

Protected Member Functions
	QtsAbstractDescriptor (QtsDescTag tag)
	Protected constructor for subclasses. More...
bool	deserializeInit (const QtsDescriptor &descriptor, const quint8 *&payload, int &payloadSize)
	Deserialization helper: Start the deserialization. More...
bool	serializeEnd (QtsDescriptor &descriptor, QtlByteBlock &data) const
	Serialization helper: Terminate a binary descriptor. More...
bool	serializeInit (QtsDescriptor &descriptor, QtlByteBlock &data) const
	Serialization helper: Start a new binary descriptor. More...

Protected Attributes
QtsDescTag	_descTag
	Descriptor tag, can be modified by subclasses. More...
bool	_isValid
	Validity flag. More...

Private Member Functions
	QtsAbstractDescriptor () Q_DECL_EQ_DELETE

Detailed Description

Abstract base class for MPEG PSI/SI descriptors.

Constructor & Destructor Documentation

~QtsAbstractDescriptor()

virtual QtsAbstractDescriptor::~QtsAbstractDescriptor ( )

inlinevirtual

Virtual destructor.

QtsAbstractDescriptor() [1/2]

QtsAbstractDescriptor::QtsAbstractDescriptor ( QtsDescTag  tag )

inlineprotected

Protected constructor for subclasses.

Parameters

[in]

tag

Descriptor tag.

QtsAbstractDescriptor() [2/2]

QtsAbstractDescriptor::QtsAbstractDescriptor ( )

private

Member Function Documentation

isValid()

bool QtsAbstractDescriptor::isValid ( ) const

inline

Check if the descriptor is valid.

Returns

True if the descriptor is valid.

invalidate()

void QtsAbstractDescriptor::invalidate ( )

inline

Invalidate the descriptor.

The descriptor must be rebuilt.

tag()

QtsDescTag QtsAbstractDescriptor::tag ( ) const

inline

Get the descriptor tag.

Returns

The descriptor tag.

serialize()

virtual bool QtsAbstractDescriptor::serialize ( QtsDescriptor &  descriptor ) const

pure virtual

This abstract method serializes a descriptor.

Parameters

[out]

descriptor

Replaced with a binary representation of this object.

Returns

True on success, false on error (invalid descriptor, data too large, etc.)

Implemented in QtsPrivateDataSpecifierDescriptor, and QtsTeletextDescriptor.

deserialize()

virtual bool QtsAbstractDescriptor::deserialize ( const QtsDescriptor &  descriptor )

pure virtual

This abstract method deserializes a binary descriptor.

Parameters

[in]

descriptor

Binary descriptor to deserialize. If the binary descriptor is not a valid representation of the QtsAbstractDescriptor subclass, this object is invalid.

Returns

True on success, false on error (invalid data, etc.)

Implemented in QtsPrivateDataSpecifierDescriptor, and QtsTeletextDescriptor.

serializeInit()

bool QtsAbstractDescriptor::serializeInit ( QtsDescriptor &  descriptor, QtlByteBlock &  data  ) const

protected

Serialization helper: Start a new binary descriptor.

Parameters

[out]	descriptor	The binary descriptor into which this object will be serialized. We invalidate it initially.
[out]	data	A byte block which receives the descriptor header. The descriptor_length field is set to zero.

Returns

True on success, false on error (invalid descriptor, etc.)

serializeEnd()

bool QtsAbstractDescriptor::serializeEnd ( QtsDescriptor &  descriptor, QtlByteBlock &  data  ) const

protected

Serialization helper: Terminate a binary descriptor.

Parameters

[out]	descriptor	The serialized descriptor. Set only if the binary descriptor is valid.
[in,out]	data	A byte block which received the descriptor data. The descriptor_length field is updated.

Returns

True if the descriptor is valid, false otherwise. When false is returned, descriptor is invalidated.

deserializeInit()

bool QtsAbstractDescriptor::deserializeInit ( const QtsDescriptor &  descriptor, const quint8 *&  payload, int &  payloadSize  )

protected

Deserialization helper: Start the deserialization.

This object is marked as invalid. The deserialize() method shall set it to true later if the serialization succeeds.

Parameters

[in]	descriptor	Binary descriptor to deserialize.
[out]	payload	Receive the address of the descriptor payload.
[out]	payloadSize	Receive the descriptor payload size.

Returns

True if the input is valid and deserialization may continue. False if the binary descriptor is invalid or has the wrong tag.

Member Data Documentation

_descTag

QtsDescTag QtsAbstractDescriptor::_descTag

protected

Descriptor tag, can be modified by subclasses.

_isValid

bool QtsAbstractDescriptor::_isValid

protected

Validity flag.

It is the responsibility of the subclasses to set the valid flag.

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

• QtsAbstractDescriptor.h
• QtsAbstractDescriptor.cpp