[wdmaudiodev] Re: Vista default audio
- From: DJ Sisolak <dsisolak@xxxxxxxxxxxxxxxxxxxxxx>
- To: "wdmaudiodev@xxxxxxxxxxxxx" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Tue, 3 Apr 2007 12:26:15 -0700
These descriptors look correct. I am not sure about the document though. I was
not part of its authoring. A quick scan of the audio portion of the spec
appears correct though. I'll ask around for the source of this paper.
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Dey
Sent: Tuesday, April 03, 2007 11:46 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Vista default audio
Is the following terminal descriptor Ok?
// bi-direction handset : Terminal Descriptors (60 bytes)
0x0C, 0x24, 0x02, 0x01, 0x01, 0x04, 0x03, 0x01, 0x00, 0x00, 0x00, 0x00, //
ID1, Input Terminal, Handset IN
0x0C, 0x24, 0x02, 0x02, 0x01, 0x01, 0x04, 0x01, 0x00, 0x00, 0x00, 0x00, //
ID2, Input Terminal, USB streaming IN
0x09, 0x24, 0x03, 0x03, 0x01, 0x04, 0x01, 0x06, 0x00, // ID3, Out
Terminal, Handset OUT
0x09, 0x24, 0x03, 0x04, 0x01, 0x01, 0x02, 0x05, 0x00, // ID4, Out
Terminal, USB streaming OUT
0x09, 0x24, 0x06, 0x05, 0x01, 0x01, 0x03, 0x00, 0x00, // ID5, Feature
Unit, handset IN volume
0x09, 0x24, 0x06, 0x06, 0x02, 0x01, 0x03, 0x00, 0x00, // ID6, Feature
Unit, handset OUT volume
Also is the document in the following link still valid?
http://www.microsoft.com/whdc/system/bus/USB/usbtelephony.mspx
Thanks,
Mike
----- Original Message -----
From: DJ Sisolak<mailto:dsisolak@xxxxxxxxxxxxxxxxxxxxxx>
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Sent: Tuesday, April 03, 2007 11:01 AM
Subject: [wdmaudiodev] Re: Vista default audio
The following tables are from the USB Audio 1.0 specification sample in
Appendix C. Note that the 0x401 in the table that indicates a Handset can be
replaced with any of the values in the sections of the "Universal Serial Bus
Device Class Definition for Terminal Types" (Release 1.0) that Richard
mentions below:
Table C-6: USB Telephone Input Terminal Descriptor (ID2)
Offset
Field
Size
Value
Description
0
bLength
1
0x0C
Size of this descriptor, in bytes.
1
bDescriptorType
1
0x24
CS_INTERFACE
2
bDescriptorSubtype
1
0x02
INPUT_TERMINAL subtype.
3
bTerminalID
1
0x02
ID of this Terminal.
4
wTerminalType
2
0x0401
Terminal is Handset In.
6
bAssocTerminal
1
0x05
Associated with Handset Out Streaming Terminal.
7
bNrChannels
1
0x01
One channel.
8
wChannelConfig
2
0x0000
Mono sets no position bits.
10
iChannelNames
1
0x00
Unused
11
iTerminal
1
0x00
Unused
Table C-9: USB Telephone Output Terminal Descriptor (ID5)
Offset
Field
Size
Value
Description
0
bLength
1
0x0C
Size of this descriptor, in bytes.
1
bDescriptorType
1
0x24
CS_INTERFACE
2
bDescriptorSubtype
1
0x03
OUTPUT_TERMINAL subtype.
3
bTerminalID
1
0x05
ID of this Terminal.
4
wTerminalType
2
0x0401
Terminal is Handset In.
6
bAssocTerminal
1
0x01
Associated with Handset In Streaming Terminal.
7
bSourceID
1
0x09
From Handset Selector Unit.
8
iTerminal
1
0x00
Unused
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Dey
Sent: Tuesday, April 03, 2007 9:52 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Re: Vista default audio
Hi Richard,
Thanks for your quick response. Can Microsoft provide us a sample terminal
descriptor table for USB telephony devices? Thanks!
Mike
----- Original Message -----
From: Richard Fricks<mailto:Richard.Fricks@xxxxxxxxxxxxx>
To: wdmaudiodev@xxxxxxxxxxxxx<mailto:wdmaudiodev@xxxxxxxxxxxxx>
Sent: Monday, April 02, 2007 11:41 AM
Subject: [wdmaudiodev] Re: Vista default audio
Hi Mike,
We are addressing this problem. For Windows XP, a QFE is being prepared that
will prevent this. This fix is currently schedule to be released in the Server
beta 3 shipment and for Vista SP1.
The USB Audio INF file contains a statement that causes USB Audio devices to
become the preferred device. The resolution involves detecting if this is a
telephony device and if so, we will not set it as the preferred audio device.
To be considered a telephony device, it must describe itself to the OS as one
of the following terminal types mentioned in the Universal Serial Bus Device
Class Definition for Terminal Types (URL):
* All terminal types under table 2.4 under section 2.4 (Bi-directional
Terminal Types)
* All terminal types under table 2.5 under section 2.5 (Telephony
Terminal Types)
* Communication speaker (Code 0x0306) Speaker or set of speakers
designed for voice communication in table 2.3 under section 2.3 (Output
Terminal Types)
Note that this fix only helps if the user plugs in the USB device *after* the
fix has been applied to the system. If the device has already been plugged in,
installing the hotfix does not go back and remove it as the preferred audio
device. In cases where the device has already been plugged in, the user would
need to go to the control panel and change the preferred device back to its
previous setting.
Thanks,
Richard Fricks
Program Manager
Windows Audio
From: wdmaudiodev-bounce@xxxxxxxxxxxxx
[mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of Mike Dey
Sent: Monday, April 02, 2007 11:02 AM
To: wdmaudiodev@xxxxxxxxxxxxx
Subject: [wdmaudiodev] Vista default audio
We have USB handsets and phones for Voip. Is there any way to let Visa NOT
SELECT our device as default audio right after installation? This is requested
by many of our customers. Thanks!
Mike
Other related posts:
