Date: Sun, 11 Sep 2011 14:32:36 -0400 From: "Mikhail T." <mi+thun@aldan.algebra.com> To: Hans Petter Selasky <hselasky@c2i.net> Cc: freebsd-multimedia@freebsd.org, freebsd-usb@freebsd.org Subject: Re: [uaudio] Sound-recording too fast Message-ID: <4E6CFEC4.5050100@aldan.algebra.com> In-Reply-To: <201109111008.12973.hselasky@c2i.net> References: <201109110308.p8B38btZ057145@narawntapu.narawntapu> <201109111008.12973.hselasky@c2i.net>
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On 11.09.2011 04:08, Hans Petter Selasky wrote:
> Doesn't aiff files use a fixed sample rate? Try:
>
> env AUDIODEV=/dev/dsp1 rec -r 16k /tmp/test.aiff
>
> Or:
>
> env AUDIODEV=/dev/dsp1 rec -r 8k /tmp/test.aiff
Well, I first noticed the problem using Skype, so I doubt, it is rec- or
aiff-specific. For me the quick and dirty hack below saved the day --
the recording is nice and clear now and I have no other USB audio
devices for this computer anyway:
--- sys/dev/sound/usb/uaudio.c 2011-07-24 19:12:34.000000000 -0400
+++ sys/dev/sound/usb/uaudio.c 2011-09-10 23:41:09.000000000 -0400
@@ -1026,4 +1026,7 @@
bit_resolution,
p_fmt->description);
+ if (ep_dir == UE_DIR_IN)
+ chan->sample_rate =
rate/3;
+ else
chan->sample_rate = rate;
chan->p_asid = asid;
I wonder, if a quirk can be added for this device...
> I'm really surprised if your Logitech announces that it supports 48K and simply outputs 16K. It would be
> the latest great example of USB specification violation!
Maybe, the rate can altered on the fly by the driver, with 48K being the
highest available, but 16K being the default?
> A dump of the descriptors using usbconfig and "sysctl hw.usb.uaudio.debug=15"
> would also be appreciated.
% sysctl sysctl hw.usb.uaudio.debug
sysctl: unknown oid 'hw.usb.uaudio.debug'
I guess, I need to have USB_DEBUG on...
% usbconfig
ugen0.1: <UHCI root HUB VIA> at usbus0, cfg=0 md=HOST spd=FULL
(12Mbps) pwr=SAVE
ugen1.1: <UHCI root HUB VIA> at usbus1, cfg=0 md=HOST spd=FULL
(12Mbps) pwr=SAVE
ugen2.1: <EHCI root HUB VIA> at usbus2, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=SAVE
ugen3.1: <UHCI root HUB VIA> at usbus3, cfg=0 md=HOST spd=FULL
(12Mbps) pwr=SAVE
ugen4.1: <UHCI root HUB VIA> at usbus4, cfg=0 md=HOST spd=FULL
(12Mbps) pwr=SAVE
ugen5.1: <EHCI root HUB VIA> at usbus5, cfg=0 md=HOST spd=HIGH
(480Mbps) pwr=SAVE
ugen2.2: <product 0x081b vendor 0x046d> at usbus2, cfg=0 md=HOST
spd=HIGH (480Mbps) pwr=ON
ugen0.2: <Microsoft Wireless Optical Mouse 1.00 Microsoft> at
usbus0, cfg=0 md=HOST spd=LOW (1.5Mbps) pwr=ON
Yours,
-mi
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