Class CMMFDataBuffer

class CMMFDataBuffer : public CMMFBuffer;

Description

This class is an abstract class for databuffers that can be presented in the form of a descriptor. A constructor is provided which instantiates a CMMFDescriptorBuffer buffer by default.

Derivation

• CBase - Base class for all classes to be instantiated on the heap

• CMMFBuffer - Abstract representation of a buffer to contain multimedia data

• CMMFDataBuffer - This class is an abstract class for databuffers that can be presented in the form of a descriptor

Members

Defined in CMMFDataBuffer:
BufferSize(), CMMFDataBuffer(), Data(), Data(), NewL(), NewL(), SetRequestSizeL(), ~CMMFDataBuffer()

Inherited from CBase:
Delete(), Extension_(), operator new()

Inherited from CMMFBuffer:
FrameNumber(), IsFileServerSafe(), IsSupportedDataBuffer(), LastBuffer(), NextFrame(), Position(), RequestSize(), SetFrameNumber(), SetLastBuffer(), SetPosition(), SetStatus(), SetTimeToPlay(), Status(), TimeToPlay(), Type(), iFrameNumber, iLastBuffer, iPosition, iRequestSize, iStatus, iTimeToPlay, iType

See also:

• CMMFDescriptorBuffer

static IMPORT_C CMMFDataBuffer *NewL();

Description

Method to instantiate a CMMFDataBuffer defaults to a CMMFDescriptorBuffer to maintain buffer compatiblity with MFAD ie. instantiating a CMMFDataBuffer defaults to creating a CMMFDescriptorBuffer. This NewL creates a CMMFDescriptorBuffer with a default size of 32 bytes.

Return value

CMMFDataBuffer * A pointer to a new CMMFDescriptorBuffer.

static IMPORT_C CMMFDataBuffer *NewL(TInt aMaxBufferSize);

Description

Method to instantiate a CMMFDataBuffer defaults to a CMMFDescriptorBuffer by default to maintain buffer compatiblity with MFAD ie. instantiating a CMMFDataBuffer defaults to creating a CMMFDescriptorBuffer. This NewL creates a CMMFDescriptorBuffer with a size of aMaxBufferSize bytes.

Parameters

TInt aMaxBufferSize The size in bytes of the descriptor buffer to be created.

Return value

CMMFDataBuffer * A pointer to a new CMMFDescriptorBuffer.

inline virtual ~CMMFDataBuffer();

Description

Destructor.

protected: inline CMMFDataBuffer(TUid aType);

Description

Protected constructor.

Parameters

TUid aType

virtual TDes8 &Data()=0;

Description

Returns a reference to the data contained in the buffer (non const version).

This is a virtual function that each derived class must implement.

Return value

TDes8 & A reference to the buffer.

virtual const TDesC8 &Data() const=0;

Description

Returns a reference to the data contained in the buffer (const version).

This is a virtual function that each derived class must implement.

Return value

const TDesC8 & A reference to the buffer.

virtual TUint BufferSize() const=0;

Description

Returns the buffer size, in bytes.

This is a virtual function that each derived class must implement.

Return value

TUint The buffer size in bytes.

virtual void SetRequestSizeL(TInt aSize)=0;

Description

Sets the request size.

Used where a component, such as a data source, may not be able to write to the entire maximum length of the buffer (variable bit rate codecs for example).

This is a virtual function that each derived class must implement.

Parameters

TInt aSize The requested size, in bytes.