Sample capture MFX APO that implements Acoustic Echo Cancellation. Because channel data is removed, the APO negotiates an output format which is different than the input format. If it is interleaved the APO will strip out the loopback audio and deliver only the microphone audio upstream. Sample APO that uses KSPROPERTY_INTERLEAVEDAUDIO_FORMATINFORMATION to determine if the keyword spotter pin is interleaving loopback audio with the microphone audio and identify which channels contain loopback audio. Sample APO that adds a delay to the input samples. Sample APO that installs onto endpoints exposed by the SysVAD sample driver and swaps the left and right channels. It also contains other common code shared by both sample drivers. DirectoryĮndpoints that are present in TabletAudioSample driver.Įndpoints that are present in both TabletAudioSample and PhoneAudioSample. The following table shows the features that are implemented in the various subdirectories of this sample.

In addition, this class contains common topology property handlers. The CMiniportTopologySYSVAD interface is the base class for all sample topologies. It also implements the IAdapterPowerManagement interface. The CAdapterCommon interface gives the miniports access to virtual mixer hardware. The framework includes implementations of the following interfaces: The driver uses a 'virtual audio device' instead of an actual hardware-based adapter, and highlights the different aspects of the audio offloading WDM audio driver architecture.ĭriver developers can use the framework in this sample to provide support for various audio devices without concern for hardware dependencies. The driver uses WaveRT and audio offloading for rendering devices.

Some of these audio devices are embedded in the system (for example, speakers, microphone arrays) while others are pluggable (like headphones, Bluetooth headsets etc.). The Microsoft SysVAD Virtual Audio Device Driver (SYSVAD) shows how to develop a WDM audio driver that exposes support for multiple audio devices. With the end of support for Windows 10 Mobile, the Phone Audio sample has been also removed from the SysVAD driver sample.

Avnex virtual audio device