Kernel Streaming Proxy Plug-ins Design Guide

The kernel-streaming (KS) proxy module ( is a DirectShow filter that brokers communication between KS objects in kernel-mode and user-mode applications. User-mode components can use KS proxy to communicate with any minidriver that is based on Ks.sys.

Specifically, an application can use the KS proxy module to control and retrieve information from KS objects that a KS minidriver implements. KS objects include, for example, KS filters, KS pins, and KS clocks.

You can extend KS proxy by writing a plug-in, which is a COM interface that provides methods to access property values. An advantage of the plug-in model is that it provides application writers with a mechanism that is more familiar than working directly with KS pin and KS filter property sets.

The following sections provide a high-level description of how to write an interface handler plug-in or a property page that uses KS proxy to communicate with a KS-based minidriver.

The interface plug-in provides programmatic control to get and set property values from within an application. Alternatively, if your goal is to enable users to manipulate properties through a user interface, a property page makes more sense. Both mechanisms require that you update the registry.

Registering KS Proxy Plug-ins

Interface Handler Plug-in

Property Page Plug-in

For more information about the KS proxy COM interfaces, exported helper functions, and structures that are used by applications and plug-ins, see Kernel Streaming Proxy.

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