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New Developments in
WDM Audio Drivers in
Windows XP
Martin Puryear
Development Lead
Windows core audio
Microsoft Corporation
WinHEc
Advancing the Platform:
PCs and Beyond
Microsoft
TEXAS
INSTRUMENTS
Agenda
Slides to be posted on WinHEc site
New features
DDK documentation additions/updates
New/updated DDK samples
New ddK tools
Important OS changes
Common problems
Resources for WDM audio developers
What can you do next?
New Features
New Features
Added in Windows Xp
Improved multi-channel support
Support for multi-channel volume/mute
Ks topology nodes
Translates into appropriate mixer controls
No Mixer API changes needed
APIs not yet revised, still stereo onlyan
waveOutsetVolume, Directsound SetPa
DDK documentation and relevant sample
code(in ac97smpl) to be added post-Beta 2
Increased Sys Audio num Chans 6-24
New Features
Added in Windows XP(2)
Additional multi-channel support
Multi-channel volume property page
Invoked from Snd Vol32 and Sounds CPL
(Volume Speaker Volume.
Manipulates individual volumes of multi-
channel controls
DirectSound Setspeaker Config API and
CPL Volume Advanced speakers pane
New enums for71and“ No speakers”
Revamped bitmaps to better express configs
Fixed KMixer SuperMix defaults
New Features
Added in Windows XP(3)
EXtended capabilities
Returns GUIDs for Mid PiD, ULONGs for driver
version revision, plus GUId to specify a long name
stored in registry(Media Categories) by INF
ks property on wave filter
KSPROPSETID General
KSPROPERTY GENERAL COMPONENTID
DDK sample: MSVADIsimple
1394 audio class driver(AVCAudio. sys)
AC97 controller drivers
Intel(ICH2), VIA, ALi, SiS
Strong suggestion: new codecs pass all WHQL tests
with windows xp in-box controller drivers
New Features
Added in Windows XP(4)
64-bit support
All core components and DDK samples ported
HW drivers for USBAudio. cs4281. AVcAudio
Native 64-bit API support
DirectSound, DirectShow, KsProxy/KSUSER
wave Out/n. mi
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