AEVAD Driver

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Microsoft Audio Engine Virtual -Audio Device (AEVAD) Driver

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SUMMARY

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This is a sample driver that demonstrates - how to develop a WDM audio driver that exposes support for audio offloading. The - driver uses a "virtual audio device" instead of an -actual hardware-based adapter and highlights the different -aspects of the audio offloading WDM audio driver architecture.

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Driver -developers can use the framework in this sample to implement offload support without concern -for hardware dependencies. The framework includes implementations of the -following interfaces:

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· -The -CAdapterCommon interface gives the miniports access -to virtual mixer hardware. It also implements the IAdapterPowerManagement -interface.

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· -The -CMiniportTopologySYSVAD interface is the base class for all sample topologies. It has -very basic common functions. In addition, this class contains common topology -property handlers.

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The following table shows -the features that are implemented in the various subdirectories of this sample.

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- Subdirectory -	- Description -
- aesamplewavert -	- Basic audio offloading driver with independent microphone support.

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BUILDING THE SAMPLE

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To build this sample, open the -VC++ project file (AESample.VcxProj) from the WDK sample content in Visual Studio Dev11.

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The sample -must be manually installed. It can be -installed via the devcon.exe tool, -which is available as a free download from http://support.microsoft.com/kb/311272, -or it can be installed programmatically via a third-party setup application.

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Devcon source code is also -included elsewhere in the WDK as a sample.

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DRIVER ISSUES

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No known issues

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CODE TOUR

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File Manifest

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File           Description

adapter.cpp    Connects the driver to the system

aevad.inf      Installation INF file for this sample

aevad.rc       Common resource file

aevadtest.h    Common header file for test cases

basetopo.cpp   Base topology class implementation

basetopo.h     Base topology class definition

common.cpp Common object used by all miniport drivers

common.h       Header file for the common object

hw.cpp         Hardware abstraction of SYSVAD

hw.h           Hardware class definition

ihvprivatepropertyset.h Header for private KS property set example

kshelper.cpp   Kernel streaming utility function implementations

kshelper.h     Kernel streaming utility function definitions

sysvad.h        Common definitions

readme.htm     The documentation for this driver (this file)

sources.inc    Common sources file included by all sample drivers

unittestdata.h Definitions that can be used for unit testing

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