[wdmaudiodev] Re: USB audio multiple recording channels
- From: "Jerry Evans" <jerry@xxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Thu, 17 Apr 2003 22:37:14 +0100
Have you asked in microsoft.public.development.device.drivers ?
I was under the impression that WinXP was compliant in this respect. Indeed
I am counting on it for our own USB hardware !
----- Original Message -----
From: <rgruner@xxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Thursday, April 17, 2003 1:10 PM
Subject: [wdmaudiodev] USB audio multiple recording channels
>
> Hi!
>
> I am developing a multichannel USB 2.0 audio device for recording 4 mono
> audio channels, i.e. 2 stereo channels. It is intended to be managed by
Windows
> audio device class driver. For now I'm still experimenting with different
> device topologies.
>
> According to USB class definition for audio devices it should be possible
to
> manage two (or more) stereo channels by defining 2 stereo Input Terminals
> (type microphone) and two Output Terminals (USB Streaming) which directly
> connect to the two ITs. All terminals reside in the same Audio Control
Interface.
> In the Audio Streaming Interface I define 2 Endpoints which connect to the
> Output Terminals.
>
> When connecting this device Windows detects it and loads the appropriate
> drivers but I can only access the first stereo channel pair, the other one
is
> not visible. The utility grapher from the DDK however, shows the intended
> topology.
>
> I tried a second design which connects as two seperate devices to Windows,
> each containing a pair of stereo channels. Doing it this way allows me to
> access all channels correctly but it blows up my descriptors (which are
> restricted in size by the USB I/F Chip I'm using) enormously.
>
> Now my question: Is Windows in general only able to handle one stereo
> channel for recording per device or is there a way to record more channels
without
> enumerating as multiple devices?
>
> Thanks for your help!
>
> Robert
>
>
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