Windows XP Support for WDM Audio

Microsoft® Windows® XP supports the following WDM audio capabilities:

• WDM version 1.20
• All the features that Windows 2000 and Windows Me support (See Windows 2000 Support for WDM Audio and Windows Me Support for WDM Audio.)
• AVStream filters, which extend the Kernel Streaming 1.0 system services (See AVStream Overview.)
• Hardware acceleration of DirectSound capture effects (See Exposing Hardware Accelerated Capture Effects.)
• Access to the extended capabilities of a WDM audio driver through the Windows Multimedia functions
• USB audio: All the features that Windows 2000 and Windows Me support, plus GFX (global effects) filtering (See GFX Filters.)
• Additional support for kernel-mode digital rights management (DRM), including IDrmPort and IDrmPort2 interfaces (See DRM Functions.)

Note  In Windows XP, the Windows multimedia functions allow a maximum of 32 device interfaces on each of the following APIs: waveIn, waveOut, midiIn, midiOut, mixer, and aux. For more information, see Windows 2000 Device-Interface Limits.