org.dvb.dsmcc

Class NPTDiscontinuityEvent

java.lang.Object

java.util.EventObject

org.dvb.dsmcc.NPTStatusEvent

org.dvb.dsmcc.NPTDiscontinuityEvent

All Implemented Interfaces:

Serializable

public class NPTDiscontinuityEvent
extends NPTStatusEvent

Sent when an MHP terminal detects a permanent value discontinuity in a broadcast timebase as defined in the main body of the present document. This may represent an error condition in the incoming broadcast.

Where the timebase is delivered using NPT, this event shall be sent following a PCR discontinuity when the MHP terminal has enough information to determine that there will be an NPT discontinuity. If the NPTDiscontinuityEvent is because of invalid data in a new NPTReferenceDescriptor then the event will be generated when that new NPTReferenceDescriptor is detected by the MHP terminal. If the NPTDiscontinuityEvent is because no new NPTReferenceDescriptor is detected within the time allowed by the main body of the present document then it will be generated when that time interval has elapsed.

Since:

MHP 1.0.1

See Also:

Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor and Description
NPTDiscontinuityEvent(DSMCCStream source, long before, long after) Construct an event.

Method Summary

Methods

Modifier and Type	Method and Description
long	getFirstNPT() Return the first known stable value of NPT after the discontinuity
long	getLastNPT() Return the last known stable value of NPT before the discontinuity

Methods inherited from class org.dvb.dsmcc.NPTStatusEvent

getSource

Methods inherited from class java.util.EventObject

toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

NPTDiscontinuityEvent

public NPTDiscontinuityEvent(DSMCCStream source,
                     long before,
                     long after)

Construct an event. The before and after values used shall be the values at the time when the receiver determined that a NPT discontinuity has happened. If the NPTDiscontinuityEvent is because of invalid data in a new NPTReferenceDescriptor then this is the time when that new descriptor was known to be invalid. If NPTDiscontinuityEvent is because of the absence of a new NPTReferenceDescriptor then this will be when the MHP terminal detects that the time interval allowed by the present document for such new descriptors has elapsed. Where an NPT value is unknown or cannot be computed, -1 shall be used.

Parameters:

source - the stream whose NPT suffered a discontinuity

before - the last NPT value detected before the discontinuity or -1 for DVB timelines

after - the first NPT value detected after the discontinuity or -1 for DVB timelines

Method Detail

getLastNPT

public long getLastNPT()

Return the last known stable value of NPT before the discontinuity

Returns:

an NPT value or -1 for DVB timelines

getFirstNPT

public long getFirstNPT()

Return the first known stable value of NPT after the discontinuity

Returns:

an NPT value or -1 for DVB timelines