1This is a directory for the kernel streaming components, along with multimedia 2kernel-mode drivers. 3 4Much of this code exists only as stubs for future implementation. 5 6The "include" directory exists as a place to store the KS related headers. It 7should be moved to the main include tree later. 8 9Andrew Greenwood 103rd December, 2006 11 12 13== Kernel Streaming (KS.SYS) == 14 15Deals with streaming media. This is the core component for this, and can be 16interacted with from usermode (usually via DirectX.) 17 18XP and DirectX 8 versions of this component provide an additional suite of 19AvStream API functions. 20 21COM-style interfaces are used with this component. 22 23 24== SysAudio (SYSAUDIO.SYS) == 25 26Filter graph builder (deals with topology.) Not sure what this does yet. 27 28 29== Port Class (PORTCLS.SYS) == 30 31Used by WDM audio drivers, this handles many common tasks required for 32audio drivers. 33 34COM-style interfaces are used with this component. 35 36 37== WDM Audio (WDMAUD.DLL / WDMAUD.SYS) == 38 39Effectively a relay from usermode to kernelmode, the usermode portion is a 40MME-style driver (for WINMM.DLL) which tells the kernelmode portion what to do. 41 42This typically involves interacting with KS.SYS in some way. 43 44In Vista, the kernelmode portion is no longer present and the usermode portion 45interacts with the Vista audio stack (which resides in usermode but also 46ultimately ends up going back into kernelmode in the end!) 47 48 49== Optional drivers == 50 51- sndblst Sound Blaster (+ Pro / 16) compatible driver 52- mpu401 MPU-401 MIDI compatible driver 53 54