SiliconDust HDHomeRun Manual de usuario descargar pdf (Pagina 10)

II.Windows BDA Drivers

The HDHomeRun Windows software include BDA drivers (32-bit and 64-bit) for use with third

party software.

Direct Show filter:

The BDA driver consists of a single Direct Show filter. The Direct Show filter is registered both as

a "BDA Source Filter" (KSCATEGORY_BDA_NETWORK_TUNER) and as a "BDA Receiver

Component" (KSCATEGORY_BDA_RECEIVER_COMPONENT) for compatibility. Only one instance

should be used (typically KSCATEGORY_BDA_NETWORK_TUNER).

BDA Demodulator type:

Windows XP includes the older “Microsoft XXXX Network Provider” components. These “Microsoft

XXXX Network Provider” components will not work with a driver that publishes multiple

demodulator nodes.

Windows MCE 2005 and Vista support both the “Microsoft XXXX Network Provider” components

and the newer universal “Microsoft Network Provider” component. This newer universal

component supports drivers that publish multiple demodulator nodes.

Windows Media Center TV Pack (WMCTVP) and later require that a US-QAM driver publish both an

8VSB demodulator node and a QAM demodulator node. This requirement means a driver that

supports US-QAM for WMCTVP will not work with the older “Microsoft XXXX Network Provider”

components.

Many third party BDA applications continue to use the older “Microsoft XXXX Network Provider”

components for compatibility with XP. This has the advantage of supporting XP, but the

disadvantage of not being able to programatically detect if an ATSC tuner supports US-QAM.

Unfortunately the conflicting combinations mean that it is not possible for a driver to publish one

set of features. To solve this problem the HDHomeRun BDA driver will auto-detect which network

provider(s) are part of the graph and use this detection to select which demodulator nodes to

publish.

It is recommended that an application attempt to use the universal “Microsoft Network Provider”

component, and only use the “Microsoft XXX Network Provider” components if the universal

component fails to instantiate.

The following table shows the demodulator nodes published by the HDHomeRun driver based on

the network provider detected.

Hardware Network

Provider

Demodulator Node Type

ATSC Universal KSNODE_BDA_8VSB_DEMODULATOR+KSNODE_BDA_QAM_DEMODULATOR

ATSC ATSC KSNODE_BDA_8VSB_DEMODULATOR

DVBT/C Universal KSNODE_BDA_COFDM_DEMODULATOR+KSNODE_BDA_QAM_DEMODULATOR

DVBT/C DVBT KSNODE_BDA_COFDM_DEMODULATOR if user configures “Digital Antenna”.

DVBT/C DVBC KSNODE_BDA_QAM_DEMODULATOR if user configures “Digital Cable”.

Frequency Offset:

With analog TV the channel frequency is typically expressed as the video carrier frequency.

With digital TV the channel frequency is typically expressed as the digital center frequency.

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SiliconDust HDHomeRun Manual de usuario Pagina 10