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A KS filter is implemented as a kernel-mode driver object that encapsulates some number of related stream-processing functions. A pin on an audio filter can be thought of as an audio jack. You may also leave feedback directly on GitHub. In this section, the term filter refers to a KS filter rather than a filter driver unless noted otherwise. Upper- and lower-level filter drivers reside above and below the function driver, respectively. The data stream from the output pin must have a data format that the input pin can accept. KS services are built upon the Windows Driver Model.

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Introduction to WDM Audio Drivers

A set of related nodes is grouped together to form a KS filterwhich represents a more-or-less independent block of stream-processing functionality.

In some contexts, the terms pin and stream can be used interchangeably. In this model, an audio adapter can be viewed as a collection of hardware devices, and the adapter driver exposes each of these devices to the audio system as an individual filter. Each filter factory is capable of instantiating filters of a particular type: If the adapter contains one or more ajd that are similar or identical in function, the driver groups the filters for those devices together into the same filter factory.

There are no open issues. KS services are built upon the Windows Driver Model. A KS filter exposes a collection of pin factories to the audio system. Data buffering is typically required to plqy out momentary mismatches in the rates at which an output pin produces data and an input pin consumes it.

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Our new feedback system is built on GitHub Issues. Vendor Audio Driver Options. A pin on an audio filter can be thought of as an audio jack.

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Choose the type you’d like to provide: A typical audio adapter card might contain audio devices for playing a wave stream through a set of speakers, converting the audio signal from a microphone to a wave stream, and synthesizing sound from a MIDI stream.

Wsm streaming KS services support kernel-mode processing of data streams for audio and for other types of continuous media. A KS filter is implemented as a kernel-mode driver object that encapsulates some number of related stream-processing functions.

You may also leave feedback directly on GitHub. Conceptually, a stream undergoes processing as it flows along a data path containing some number of processing nodes. The functionality can be implemented in software or in hardware. Each pin factory is capable of instantiating pins of a particular type.

An adapter driver exposes a collection of filter factories to the audio system. For updates and information about new features of the WDM audio architecture, see the audio technology website.

Each filter factory is capable of instantiating filters of a particular type:. For example, a audiodtive that performs audio mixing might have one pin factory that can instantiate a single output pin and a second pin factory that can instantiate several input pins.

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Product feedback Sign in to give documentation feedback. This section contains the following topics: If the adapter contains several different types of devices, those devices are presented through several different filter factories.

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A client instantiates an input or output pin on a filter when the client needs to route a data stream into or out of that filter. Feedback We’d love to hear your thoughts.

The adapter driver can wrap each of these audio devices in a KS filter that it exposes to the operating system. Note that the term KS filter must be distinguished from the term filter driverwhich is another WDM concept. If the filter can provide one or more pins that are similar or identical in function, the filter groups those pins together into the ;lay pin factory.

The operating system connects the filters to other filters to form filter graphs that process audio streams on behalf of application programs. KS filters are connected together through their pins. More complex functions can be constructed in a modular way by cascading several filters together to form a filter graph. The data stream from the output pin must have a anx format that the audiodruve pin can accept.

Read about this change in our blog post.