Class CSystemClockSource

class CSystemClockSource : public CBase, public MMMFClockSource;

Description

The CSystemClockSource provides a basic clock source implementation based on the system clock. It will count microseconds since the object was created or Reset() was last called, and return that count from Time(). It does not implement any custom interfaces.

Derivation

• MMMFClockSource - Defines the interface that video clock sources must to implement
• CBase - Base class for all classes to be instantiated on the heap

• CSystemClockSource - The CSystemClockSource provides a basic clock source implementation based on the system clock

Members

Defined in CSystemClockSource:
CustomInterface(), NewL(), Reset(), Reset(), Resume(), Suspend(), Time(), ~CSystemClockSource()

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

static IMPORT_C CSystemClockSource *NewL();

Description

Creates a new CSystemClockSource object.

Return value

CSystemClockSource * "A new clock source object."

Leave codes

"This method may leave with one of the system-wide error codes."

IMPORT_C ~CSystemClockSource();

Description

Destructor.

IMPORT_C void Reset();

Description

Resets the clock source to zero. Typically called by the DevVideo client at stream start.

IMPORT_C void Reset(const TTimeIntervalMicroSeconds &aOffset);

Description

Resets the clock source to a user-defined offset. Typically called by the DevVideo client when seeking in a file.

Parameters

const TTimeIntervalMicroSeconds &aOffset "The clock offset."

IMPORT_C void Suspend();

Description

Suspends the clock source. The clock time will not increment until the clock has been resumed. This method is used when pausing playback.

IMPORT_C void Resume();

Description

Resumes the clock source after a Suspend() method call. This method is used when resuming playback.

virtual TAny *CustomInterface(TUid aInterface);

Description

No custom interfaces are implemented by this clock source, so this method will always return NULL.

Parameters

TUid aInterface "The interface"

Return value

TAny * "NULL"

virtual TTimeIntervalMicroSeconds Time();

Description

Retrieves the time that has elapsed since Reset() was last called, subtracting any time during which the clock was suspended.

Return value

TTimeIntervalMicroSeconds "The number of microseconds that have elapsed in the stream."