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Microsoft provides support for the IEEE Audio/Video Control (AV/C) protocol in Windows XP and later operating systems. The AV/C protocol defines methods for issuing commands to and sending responses from subunits on AV/C-compliant devices. You can control subunits on devices that conform to the AV/C protocol across the IEEE 1394 serial bus if you write a driver to support the subunit hardware. Note that you do not need to write a subunit driver to support tape subunits because Microsoft supplies two other drivers for this functionality, Msdv.sys and Mstape.sys.

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To support the AV/C protocol, Microsoft supplies the following two drivers:

• Avc.sys

• Avcstrm.sys

Avc.sys is a function driver that provides support to establish and manage subunit/unit plug connections. Avcstrm.sys is a lower-filter driver that adds support to assist with streaming the following specific data formats:

• Standard definition digital video (SDDV, the 61883-2 specification)

• MPEG2-TS (the 61883-4 specification)

Depending on the functionality of your device, you can use the optional support provided in Avcstrm.sys to assist with streaming SDDV and/or MPEG2-TS data. If Avcstrm.sys does not support a format used by your device, then you can use the connection management and data streaming functionality exposed by 61883.sys, which is located lower in the driver stack.

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Subunit drivers should follow the Windows Driver Model (WDM) architecture. Subunit drivers can use either the Stream class interface or the AVStream interface. AVStream is the preferred interface for developing a subunit driver. The Stream class interface is obsolete, and Microsoft has discontinued its further development. For more information about these two interfaces, see AV/C Kernel-Streaming Interface and KS Proxy Plug-ins.

For more information about how to write an AV/C subunit driver, see AV/C Overview. For more information about how to use Avcstrm.sys to assist streaming data, see AV/C Streaming Overview.

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AV/C protocol support is built on the IEEE 1394 driver stack and the IEC-61883 standards. For more information about the IEC-61883 driver stack, see IEC-61883 Client Drivers.