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Concept
Audio plug-in
Summary
An audio plug-in, in computer software, is a plug-in that can add or enhance audio-related functionality in a computer program. Such functionality may include digital signal processing or sound synthesis. Audio plug-ins usually provide their own user interface, which often contains GUI widgets that can be used to control and visualise the plug-in's audio parameters.
There are three broad classes of audio plug-in: those which transform existing audio samples, those which generate new audio samples through sound synthesis and those which analyze existing audio samples. Although all plug-in types can technically perform audio analysis, only specific formats provide a mechanism for analysis data to be returned to the host.
The program used to dynamically load audio plug-ins is called a plug-in host. Example hosts include Bidule, Gig Performer, Mainstage, REAPER and Sonic Visualiser. Plug-ins can also be used to host other plug-ins. Communication between host and plug-in(s) is determined by a plug-in API. The API declares functions and data structures that the plug-in must define in order to be usable by a plug-in host. Additionally, a functional specification may be provided, which defines how the plug-in should respond to function calls, and how the host should expect to handle function calls to the plug-in. The specification may also include documentation about the meaning of variables and data structures declared in the API. The API s, specification, shared libraries, license and documentation are sometimes bundled together in an SDK.
Official source
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