![]() ![]() Partners that are engaged with Microsoft through Partner Center can also access this content through Collaborate. The latest versions of Windows, the WDK, and the SDK can be downloaded below through the Windows Insider Program. If an APO intends to function on both Windows 10 and Windows 11, it can examine whether it is being initialized with the APOInitSystemEffects2 or the APOInitSystemEffects3 structure to determine whether it is running on an OS that supports the CAPX APIs. Windows 10 will not have support for these APIs. The APIs described in this topic are available starting in build 22000 of the Windows 11 OS, WDK, and SDK. For example, if an APO is using registry data to save settings instead of using the Settings Framework, the associated HLK test will fail. This will be validated through the Windows 11 HLK tests. Custom implementations for these core audio processing extensions (Settings, Logging, Notifications, Threading, AEC) are expected to leverage CAPX APIs. Additionally, any APOs leveraging AEC are expected to follow the implementation outlined in this topic, validated via HLK. Windows 11 APO CAPX development requirementsĪny new APOs that ship on a device for Windows 11 are required to be compliant with the APIs listed in this topic, validated via HLK. ![]() When an APO implements this interface, the OS interprets this as an implicit signal that the APO supports the APO Settings framework and allows the APO to subscribe for common audio related notifications from the audio engine. To leverage these new APIs, APOs are expected to utilize the new IAudioSystemEffects3 interface. The Audio Effects Discovery and Control APIs allows the OS to detect, enable, and disable effects that are available for processing on a stream.The Threading framework allows APOs to be multithreaded by using an OS managed, MMCSS-registered thread pool.The Logging framework aids in the development and debugging of APOs.The Notifications framework allows audio effects (APOs) to request notifications for handling volume, endpoint and audio effects property store changes.When these methods are implemented by an APO, they can be invoked by Hardware Support Apps (HSA) that are associated with that APO. The Settings framework will allow APOs to expose methods for querying and modifying the property store for audio effects (“FX property store”) on an audio endpoint.The Acoustic Echo Cancellation (AEC) framework allows an APO to identify itself as an AEC APO, granting access to a reference stream and additional controls.Some of the APIs described here enable new scenarios for Independent Hardware Vendors (IHV) and Independent Software Vendors (ISV), while other APIs are meant to provide alternatives that improve overall audio reliability and debugging capabilities. For more information, see Windows Audio Processing Objects. These effects are packaged as user-mode Audio Processing Objects (APOs). Windows allows third-party audio hardware manufacturers to include custom host-based digital signal processing effects. This topic introduces a set of new Windows 11 APIs for Audio Processing Objects (APOs) that are shipped with an audio driver.
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