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74 lines
2.3 KiB
Text
74 lines
2.3 KiB
Text
ReactOS Audio Service (audiosrv.exe)
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====================================
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This is intended to operate in a similar manner to how the Windows Audio
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Service does.
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NOTE: The service filename is audiosrv.dll on Windows XP. This shouldn't
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have any impact on functionality.
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AudioSrv on Windows creates a mapped file at:
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Global\mmGlobalPnpInfo
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The ReactOS audio device list lives at:
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Global\AudioDeviceList
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This file appears to contain a list of devices that WinMM accesses and
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subsequently passes to wdmaud.drv
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It is not necessary to duplicate the exact structure of this mapped
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file, since it appears to only be used internally by Windows components.
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The ROS Audio Service (AudioSrv) is intended to be able to run
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alongside the Windows Audio Service on XP/Vista, so it should be
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possible to test in a "known working environment" ;)
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It will create a mutex, to:
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1) Allow synchronization when accessing the device list
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2) Provide a simple method of identifying if AudioSrv is running
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(It might be worth using an event to notify WinMM when things are
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happening?)
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The intention is to make AudioSrv receive PnP notifications for
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relevant audio devices, and also let AudioSrv in Windows do this. Then
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it should be possible to create a small application that imitates
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WinMM's actions :)
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Current Status
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==============
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AudioSrv registers for device notifications and obtains a list of the
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current audio devices in the system (devices registered against the
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KSCATEGORY_AUDIO interface).
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ReactOS does not currently have RegisterDeviceNotification implemented,
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so for the moment this service considers the failure of this API call
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to be non-fatal and will proceed without device event notification. This
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behaviour will be amended in a future revision (ie once this API call
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is implemented!)
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Testing the Service
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===================
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The service can be installed on Windows XP (possibly also Vista) like so:
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sc create AudioSrv <path to audiosrv.exe>
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net start AudioSrv
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...and can be removed like so:
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net stop AudioSrv
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sc delete AudioSrv
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You can view a list of the currently available devices (device list is
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identical to the one offered by Windows' own AudioSrv) by running
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my READER.EXE test utility, available in the following package:
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http://stuff.silverblade.co.uk/reactos/sharedlist.tar.gz
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That's all for now, folks ;)
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Andrew Greenwood
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September 2007
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