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The functionality can be implemented in software or in hardware. The operating system connects the filters to other filters to form filter graphs that process audio streams on behalf of application programs. The data stream from the output pin must have a data format that the input pin can accept. 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. This section contains the following topics: A KS filter exposes a collection of pin factories to the audio system.

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Feedback We’d love to hear your thoughts. A pin on an audio filter can be thought of as an audio jack. 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.

For updates and information about new features of the WDM audio architecture, see the audio technology website. Conceptually, a stream undergoes processing as it flows along a data path containing some number of processing nodes. A Anf filter exposes a collection of pin factories to the audio system.

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.

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Each filter factory is capable of instantiating filters of a particular type:. Read about this change in our blog post. Note that the term KS filter must be distinguished from the term filter driverwhich is another WDM concept.

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Kernel streaming KS services support kernel-mode processing of data streams for audio and for other types of continuous media.

More complex functions can be constructed in a modular way by cascading several filters together to form a filter graph. Product feedback Sign in to give documentation feedback.

Each pin factory is capable of instantiating pins of a particular type. The data stream from the output pin must have a data format that the input pin can audiodrife.

If the filter can provide one or more pins that are similar or identical in function, the filter groups those pins together into the same pin factory. For example, a filter 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. KS filters are connected together through their pins.

KS services are built upon the Windows Driver Model. In some contexts, the terms pin and stream can be used interchangeably. A client instantiates anx input or output pin on a filter when the client needs to route a data stream into or out of that filter.

If the adapter contains several different types of devices, those anc are presented through several different filter factories. A set of related nodes is grouped together to form a KS filterwhich represents a more-or-less independent block of stream-processing functionality. Vendor Audio Driver Options. There are no open wdn. Upper- and lower-level filter drivers reside above plqy below the function driver, respectively.

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If the adapter contains one or more devices that are similar or identical in function, the driver groups the filters for those devices together into the same filter factory.

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The functionality can be implemented in software or in hardware. The output pin of the upstream filter is connected to the input pin of the downstream filter. Data buffering is typically required to smooth out momentary mismatches in the rates at which an output pin produces data and an input pin consumes it.

Choose the type you’d ply to provide: An adapter driver exposes a collection of filter factories to the audio system. The adapter driver can wrap each of these audio devices in a KS filter that it exposes to the operating system. The operating system connects the filters to other filters to form filter graphs that process audio streams on behalf of application programs.