[wdmaudiodev] Re: Few questions about core Audio APIs in Vista
- From: Mitchell Rundle <mitchr@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 4 Dec 2006 09:51:18 -0800
A1. Sorry, but there is no public method for enumerating all of the audio
sessions.
A2. Most hardware volume controls have .5, 1 or 1.5dB steps. Whether the
hardware returns the actual volume level (e.g. -5dB) or the last value set
(e.g. -5.02dB) depends on the driver, but in general you should expect that the
level will be a multiple of *pfStepping.
Regards,
Mitch Rundle
Microsoft
This posting is provided "AS IS" with no warranties, and confers no rights.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Andrew Mindrin
Sent: Thursday, November 30, 2006 11:09 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Few questions about core Audio APIs in Vista
Hi,
The questions are:
Q1. Enumerating all audio sessions
----------------------------------
I need to enumerate all audio sessions in Vista to take control over
them like Sndvol.exe. Is there a way? I need that to create custom
volume control software.
I've tried to play with WASAPI, but it is possible only to create new
session or to open a sessions of current process created by high-level
API.
Q2. Volume levels in Vista
--------------------------
I've noticed that some sound drivers for Vista doesn't support precise
volume setup. E.g. with the latest driver from Creative (2.11.0000) when
I set volume by using IAudioVolumeLevel::SetLevel to e.g. -5.02 dB and
then has read it by using IAudioVolumeLevel::GetLevel, the result is -5
dB instead of -5.02 dB. Is this driver bug or volume level in Vista can
be set\read only with a step returned by GetLevelRange method (pfStepping
parameter)? If this is not a bug, how to set\read precise levels?
Many thanks,
Andrew
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