[wdmaudiodev] Re: Are volume and mute controls optional for UAC 1.0 device?
- From: Matthew van Eerde <Matthew.van.Eerde@xxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Wed, 3 Dec 2014 17:52:23 +0000
Some render devices support compressed formats (e.g., S/PDIF-ized Dolby
Digital). If an app is playing to the device using a compressed format, Windows
will not be able to perform software volume or software mute.
So, Windows recommends having at least a hardware mute on devices that support
compressed formats.
-----Original Message-----
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Clemens Ladisch
Sent: Tuesday, December 2, 2014 11:51 PM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Are volume and mute controls optional for UAC 1.0
device?
Robert S. Giaraffa wrote:
> Are Mute and Volume controls both optional for a USB Audio Class 1.0
> compliant device?
Yes. There is hardware that does not have these controls (e.g., the Edirol
UA-1A).
> Will Windows perform the volume/mute functions if the device does not
> declare these controls?
Yes.
Regards,
Clemens
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