From owner-freebsd-multimedia@FreeBSD.ORG  Mon Apr 11 07:34:31 2011
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From: Hans Petter Selasky <hselasky@c2i.net>
To: Thierry Thomas <thierry@freebsd.org>
Date: Mon, 11 Apr 2011 09:33:29 +0200
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Cc: freebsd-multimedia@freebsd.org, FreeBSD-gnats-submit@freebsd.org,
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Subject: Re: kern/152622: [pcm] uaudio recording problem
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On Sunday 10 April 2011 12:03:29 Thierry Thomas wrote:
> Apr 10 12:00:01 graf kernel: ugen4.3: <vendor 0x046d> at usbus4
> Apr 10 12:00:01 graf kernel: uaudio0: <vendor 0x046d product 0x0825, class
> 239/2, rev 2.00/0.10, addr 3> on usbus4 Apr 10 12:00:01 graf kernel:
> uaudio_chan_dump_ep_desc: endpoint=0xc73d3995 bLength=9 bDescriptorType=5
> Apr 10 12:00:01 graf kernel: bEndpointAddress=134 bmAttributes=0x5 Apr 10
> 12:00:01 graf kernel: wMaxPacketSize=196 bInterval=4
> Apr 10 12:00:01 graf kernel: bRefresh=0 bSynchAddress=0

The wMaxPacketSize should be 96 = 2 * 48 and not 196. Maybe your audio device 
delivers data in chunks of data instead of a steady stream. I'll look into it 
later today.

--HPS