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IDvbLogicalChannelDescriptor Interface

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

The IDvbLogicalChannelDescriptor interface enables the client to get a logical channel descriptor from a DVB stream. The logical channel descriptor may be present in the network information table (NIT).

Methods

The IDvbLogicalChannelDescriptor interface inherits the methods of the IUnknown interface.

In addition, IDvbLogicalChannelDescriptor defines the following methods.

Method Description

GetCountOfRecords

Returns the number of records in the logical channel descriptor.

GetLength

Returns the length of the descriptor body.

GetRecordLogicalChannelNumber

Returns the logical channel number at a specified index in the channel list.

GetRecordServiceId

Returns the service identifier at a specified index in the channel list.

GetTag

Returns the descriptor tag.

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 logical channel descriptor tag (0x83). If the descriptor is present, the method returns an IGenericDescriptor pointer.
  3. Query the returned IGenericDescriptor pointer for the IDvbLogicalChannelDescriptor interface.

Requirements

Header Declared in Dvbsiparser.h.

See Also

BDA Interfaces

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Build date: 12/4/2008