In addition to simple 8- and 16-bit, mono and stereo data formats, the KMixer driver supports:īit depths greater than 16 bits, and multichannel formats with more than two channels

Speaker configuration and channel mapping The KMixer system driver (Kmixer.sys) is the KS filter that does the following: Kernel-mode software synthesizers (See SWMidi System Driver and DMusic System Driver.) Sound Blaster emulator (See SBEmul System Driver.) Redbook CD digital audio (See Redbook System Driver.) Windows multimedia APIs waveIn, waveOut, midiIn, midiOut, mixer, and aux (See Windows SDK documentation.) The following audio stream sources use the graphs that SysAudio builds:ĭirectSound (See Microsoft Windows SDK documentation.) Transparent to the client, the SysAudio driver configures all the KS filters in the filter graph that are connected together to form the virtual audio device. 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:

Microsoft audio architecture driver xp