[wdmaudiodev] Re: Audio Enhancements Problem
- From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 21 Jan 2015 16:29:32 +0000
There's no technical block on added delay. An APO can add as much delay as it
wants, provided it reports that delay via IAudioProcessingObject::GetLatency().
If calls to IAudioProcessingObjectRT::APOProcess take too long in aggregate, as
a fraction of the Windows audio engine period, new streams will be failed with
AUDCLNT_E_CPUUSAGE_EXCEEDED.
The error you're seeing sounds like something else:
https://msdn.microsoft.com/en-us/library/windows/hardware/ff538609(v=vs.85).aspx
"Also, if the failure count value for an LFX or a GFX sAPO reaches a
system-specified limit, both the LFX and the GFX sAPOs are disabled by setting
the PKEY_Endpoint_Disable_SysFx registry key to '1'. The system-specified limit
is currently a value of 10."
This includes failures creating the APO, initializing the APO, negotiating
formats, etc.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Tim Roberts
Sent: Tuesday, January 20, 2015 9:43 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Audio Enhancements Problem
What heuristic leads the audio engine to put up the dialog "Windows has
detected that audio enhancements for the following device are causing
problems"? Does that necessarily mean that there has been an uncaught
exception in the APO? Or is there a fuzzier heuristic in place? Like "audio
is being delayed and there is an APO, so the APO must be at fault"?
--
Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.
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