IDvbTerrestrialDeliverySystemDescriptor Interface

This topic applies to Update Rollup 2 for Microsoft Windows XP Media Center Edition 2005 and later.

The IDvbTerrestrialDeliverySystemDescriptor interface enables the client to get a terrestrial delivery system descriptor from a DVB stream. The terrestrial delivery system descriptor may be present in the network information table (NIT). For more information, refer to ETSI EN 300 468.

Methods

The IDvbTerrestrialDeliverySystemDescriptor interface inherits the methods of the IUnknown interface.

In addition, IDvbTerrestrialDeliverySystemDescriptor defines the following methods.

Method	Description
GetBandwidth	Returns the bandwidth in use.
GetCentreFrequency	Returns the center frequency.
GetCodeRateHPStream	Returns the code rate for the high-priority (HP) stream.
GetCodeRateLPStream	Returns the code rate for the low-priority (LP) stream.
GetConstellation	Returns the constellation pattern.
GetGuardInterval	Returns the guard interval.
GetHierarchyInformation	Returns the hierarchy alpha information.
GetLength	Returns the length of the descriptor body.
GetOtherFrequencyFlag	Returns a flag that specifies whether other frequencies are in use.
GetTag	Returns the descriptor tag.
GetTransmissionMode	Returns the transmission mode.

Remarks

To obtain a pointer to this interface, do the following:

1. Call IDvbSiParser::GetNIT to get the IDVB_NIT interface.
2. Call IDVB_NIT::GetRecordDescriptorByTag and pass in the terrestrial delivery system descriptor tag (0x5A). If the descriptor is present, the method returns an IGenericDescriptor pointer.
3. Query the returned IGenericDescriptor pointer for the IDvbTerrestrialDeliverySystemDescriptor interface.

Requirements

Header

Declared in Dvbsiparser.h.

See Also

BDA Interfaces

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Build date: 12/4/2008