![]() ![]() ![]() The client communicates only with the virtual audio device rather than with the individual devices that make up the virtual audio device. (Adapter drivers should not register themselves in this category, which is reserved exclusively for SysAudio.) For example, a virtual MIDI device might represent a filter graph that is created by connecting the SWMidi driver, the KMixer driver, and a port/miniport driver. The SysAudio driver represents audio filter graphs as virtual audio devices and registers each virtual audio device as an instance of a KSCATEGORY_AUDIO_DEVICE device interface. The SysAudio system driver (Sysaudio.sys) builds the filter graphs that render and capture audio content. The kernel-mode WDMAud driver is a kernel streaming (KS) filter and a client of the SysAudio system driver. WDMAud performs I/O for the following APIs: waveIn, waveOut, midiIn, midiOut, mixer, and aux (described in the Microsoft Windows SDK documentation). The pair of WDMAud drivers translate between user-mode Microsoft Windows multimedia system calls and kernel-streaming I/O requests. The kernel-mode WDMAud system driver (Wdmaud.sys) is paired with the user-mode WDMAud system driver (Wdmaud.drv). USB Audio Class System Driver (Usbaudio.sys)ĪVCAudio Class System Driver WDMAud System Driver Port Class Adapter Driver and PortCls System Driver The kernel-mode Microsoft Windows Driver Model (WDM) audio components are:
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