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Date:      Mon, 11 Apr 2011 09:33:29 +0200
From:      Hans Petter Selasky <hselasky@c2i.net>
To:        Thierry Thomas <thierry@freebsd.org>
Cc:        freebsd-multimedia@freebsd.org, FreeBSD-gnats-submit@freebsd.org, bug-followup@freebsd.org
Subject:   Re: kern/152622: [pcm] uaudio recording problem
Message-ID:  <201104110933.30040.hselasky@c2i.net>
In-Reply-To: <20110410100329.GC11620@graf.pompo.net>
References:  <201104091330.p39DUIUL067012@freefall.freebsd.org> <201104100900.31305.hselasky@c2i.net> <20110410100329.GC11620@graf.pompo.net>

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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



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