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 CSystemClockSource::Reset() was last called, and return that count from CSystemClockSource::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...

Members

Defined in CSystemClockSource:

• CustomInterface(TUid)No custom interfaces are implemented by this clock source, so this method will a...
• NewL()Creates a new CSystemClockSource object.
• Reset()Resets the clock source to zero. Typically called by the DevVideo client at stre...
• Reset(const TTimeIntervalMicroSeconds &)Resets the clock source to a user-defined offset. Typically called by the DevVid...
• Resume()Resumes the clock source after a CSystemClockSource::Suspend() method call. This...
• Suspend()Suspends the clock source. The clock time will not increment until the clock has...
• Time()Retrieves the time that has elapsed since CSystemClockSource::Reset() was last c...
• ~CSystemClockSource()Destructor.

Inherited from CBase:

• Delete(CBase *)Deletes the specified object.
• Extension_(TUint,TAny *&,TAny *)Extension function
• operator new(TUint)Allocates the object from the heap and then initialises its contents to binary z...
• operator new(TUint,TAny *)Initialises the object to binary zeroes.
• operator new(TUint,TLeave)Allocates the object from the heap and then initialises its contents to binary z...
• operator new(TUint,TLeave,TUint)Allocates the object from the heap and then initialises its contents to binary z...
• operator new(TUint,TUint)Allocates the object from the heap and then initialises its contents to binary z...

IMPORT_C static 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 CSystemClockSource::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 CSystemClockSource::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."