colour changes, identification of objects, applying overlays), and fit between the function driver and the user application that has connected to the camera.Īnother type of filter driver is the bus (e.g. An upper level filter typically provide added-value features for a camera, such as additional processing of the video stream (e.g. watching for interrupt packets from a camera switch) and fits between the function and bus drivers. A lower level filter modifies the behavior of the camera hardware (e.g. įor example, the generic USB camera (UVC) driver usbvideo.sys is a function driver, while the bus driver handles USB data from the host controller devices. The Windows Dev Center - Hardware pages explain upper and lower filter drivers in detail. Upper level filter drivers sit above the primary driver for the device (the function driver), while lower level filter drivers sit below the function driver and above the bus driver.įilters may work on a certain brand of device such as a mouse or keyboard, or they may perform some operation on a class of devices, such as any mouse or any keyboard. Written either by Microsoft or the vendor of the hardware, any number of filter drivers can be added to Windows. A filter driver should not affect the normal working of the existing driver stack in any major way. It is a driver or program or module that is inserted into the existing Driver Stack to perform some specific function.

JSTOR ( February 2015) ( Learn how and when to remove this template message)Ī filter driver is a Microsoft Windows driver that extends or modifies the function of peripheral devices or supports a specialized device in the personal computer.

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