[wdmaudiodev] Re: who can give me a packet of source code for usb audio device ?
- From: "jerry_wang" <jerry_wang@xxxxxxxxxxxxxx>
- To: <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Fri, 9 Apr 2004 10:56:33 +0800
hi,everyone
As you known, USBAudio.sys can handle everything for my device.
But i yet need to re-write the minidriver for my boss. :(
In fact, i can parse every descriptor of Audio class, and understand
its topology.
The Topology of my USB device as following:
+--------------+
IT--------------- | Feature Unit |---------------OT
+--------------+
+--------------+
OT----------------| Feature Unit |---------------IT
+--------------+
How to descript the topology in HW_STREAM_DESCRIPTOR ?
(KS's Topology is different with USB Audio Class.)
2,Which Properties are must support ?
may you help me?
jerry
04/04/09
----- Original Message -----
From: "Tim Roberts" <timr@xxxxxxxxx>
To: <wdmaudiodev@xxxxxxxxxxxxx>
Sent: Thursday, April 08, 2004 12:45 AM
Subject: [wdmaudiodev] Re: who can give me a packet of source code for usb
audio device ?
> jerry_wang wrote:
>
> > hi,
> > i need write a driver for usb headset.
> > but i don't know how to provide HW_STREAM_INFORMATION ( for example
> > Topology,Property..)
> > in my minidriver.
> > may you help me ?
>
>
> Most USB headsets are designed to comply with the USB Audio Class
> specification. When that is true, they need no driver at all. The
> standard USBAUDIO driver will handle everything for you.
>
> Even if the device is not completely USB Audio Class compliant, as long
> as there are iso streams available, sometimes the easiest approach is to
> write a small lower filter to USBAUDIO to supply the Audio Class
> interface descriptors.
>
> Only a poorly designed USB headset would require a full kernel streaming
> driver.
>
> --
> - Tim Roberts, timr@xxxxxxxxx
> Providenza & Boekelheide, Inc.
>
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