From: "Hakon Strande" <hakons@xxxxxxxxxxxxxxxxxxxxx>
Reply-To: wdmaudiodev@xxxxxxxxxxxxx
To: <wdmaudiodev@xxxxxxxxxxxxx>
Subject: [wdmaudiodev] Re: Wave-sink for Kernel-mode Software Synthesizer
fails to function in Vista.
Date: Fri, 3 Mar 2006 09:41:22 -0800
Dear Ellwe,
The audio subsystem in Vista is completely re-designed - the biggest
change in the audio pipeline since Windows 3.1 in my opinion. Some
things are gone, like all the audio kernel mode components. Kernel-mode
software synthesizers are no longer supported on Vista because they
relied on Kmixer.sys which is no longer part of Windows in Vista and
beyond. Kernel-mode hardware synthesizers are still supported.
The move to user mode and removal of all the kernel mode components is
part of an effort to build a more transparent, low latency, stable and
secure streaming audio system.
Sincerely,
Hakon Strande
PM Integrated, Internal, External, and Wireless Audio Devices
MediaTech/DMD/Windows Client/Microsoft
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Ellwe Loh
Sent: Monday, February 27, 2006 7:42 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Wave-sink for Kernel-mode Software Synthesizer
fails to function in Vista.
Hi,
I'm implementing a Kernel-Mode Software Synthesizer which exposes an
ISynthSinkDMus interface to the DMUS port driver. After setting the the
neccessary interfaces (similar to that of ddksynth sample), there's no
audio
output.
When i start to play a MIDI file, IMiniportDMus::NewStream method of
streamtype "DMUS_STREAM__MIDI_RENDER" was called for a stream object to
be
created for the input pin, but IMiniportDMus::NewStream of streamtype
"DMUS_STREAM_WAVE_SINK" was not called. Thus, only MIDI messages get fed
into the input pin, but the ISynthSinkDMus::Render method doesn't get
called.
I've tested with the ddksynth sample and encounter similar behaviour.
Is the DMUS wave-sink mechanism still prevail in Vista? Or Is there
something else that I need to handle for this wave-sink mechanism to
work
under Vista?
Thanks.
Ellwe
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