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Connections Between Two Unit Plugs in Different AV/C Units

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Scenarios 7 and 8 represent connections between a subunit in one unit to a subunit in a different unit, where the target does not support subunit to unit connections within one AV/C unit. These type of connections require the Signal source and Input select CCM commands.

Scenarios 7 and 8 describe subunit source or destination plugs that have the KSPIN_FLAG_AVC_PCRONLY flag set in the Flag member of their AVCPRECONNECTINFO structures, which is translated by Avc.sys to 0xFF for their subunit's address.

Scenario 7

Signal source: Intra-unit connection is not supported by the local unit.

Input select: The local unit connects from any available (0x7F) isochronous output plug on the target unit to any available (0x7F) isochronous input plug on the local unit and then connects to a specific (0x0 to 0x1E) or any available (0xFF) subunit destination plug on the local unit.

diagram illustrating a connection where the local pin’s dataflow member is kspin-dataflow-in.

Scenario 7 describes a connection where the local pin's DataFlow member is KSPIN_DATAFLOW_IN.

Each column in the following table corresponds to a member of the AVCCONNECTINFO structure and specifies values for these members for a source subunit plug.

DeviceID SubunitAddress SubunitPlugNumber UnitPlugNumber (for isochronous output)

Target

Subunit address

Source plug (0xFF) - value is ignored

0x0 to 0x1E, or 0xFF

Each column in the following table corresponds to a member of the AVCCONNECTINFO structure and specifies values for these members for a destination subunit plug.

DeviceID SubunitAddress SubunitPlugNumber UnitPlugNumber (for isochronous input)

Self

Self

Destination plug (0x0 to 0x1E, or 0xFF)

0x7F

Scenario 8

Signal source: The local unit connects to any subunit's source plug to any available (0x7F) isochronous output plug (and returns the isochronous output plug's number).

Input select: The target unit connects from local unit's isochronous output plug (returned in signal source CCM command) to any available (0x7F) isochronous input plug on the target unit.

diagram illustrating a connection where the local pin’s dataflow member is kspin-dataflow-out.

Scenario 8 describes a connection where the local pin's DataFlow member is KSPIN_DATAFLOW_OUT.

Each column in the following table corresponds to a member of the AVCCONNECTINFO structure and specifies values for these members for a source subunit plug.

DeviceID SubunitAddress SubunitPlugNumber UnitPlugNumber (for isochronous output)

Self

Self

Source plug (0x0 to 0x1E, or 0xFF)

0x7F

Each column in the following table corresponds to a member of the AVCCONNECTINFO structure and specifies values for these members for a destination subunit plug.

DeviceID SubunitAddress SubunitPlugNumber UnitPlugNumber (for isochronous input)

Target

Subunit Address

Destination plug (0xFF) - value is ignored

0x0 to 0x1E, or 0x7F

The following list describes the meaning of values that appear in the preceding tables:

  • The values 0x0 to 0x1E (30 decimal) represent specific plug numbers.

  • The value 0x7F represents any available isochronous input or output plug number on the AV/C unit.

  • The value 0xFF represents any available subunit source or destination plug address.

  • "Self" contains the pin to which the AVCCONNECTINFO structure is setting. "Target" represents the data that the AVCCONNECTINFO structure is for.

  • The values in the DeviceID columns (for source and destination subunit plugs) are used to search for the physical device object (PDO) of the target AV/C device to issue AV/C CCM commands to.