[wdmaudiodev] Re: Why would you want USB Audio 2.0 in Windows?

  • From: Tim Roberts <timr@xxxxxxxxx>
  • To: wdmaudiodev@xxxxxxxxxxxxx
  • Date: Mon, 26 Oct 2009 15:30:30 -0700

Matt Gonzalez wrote:
> That make sense.  But is that limitation imposed by the maximum speed
> of USB 1.1, or by the driver?

Both, in a sense.  The driver was designed for USB 1.1, so it does not
know how to drive isochronous endpoints that do more than one transfer
per frame.  That takes extra work when setting up the URB.  It works
just fine with USB 2.0 devices, as long as those devices stay at one
transfer per frame or less, and that limits you to 1 MB/sec.

Tim Roberts, timr@xxxxxxxxx
Providenza & Boekelheide, Inc.

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