USB microphone problems
olli at lurza.secnetix.de
Tue Apr 12 14:40:32 UTC 2011
Sorry for posting to both usb@ and multimedia@, but I'm not
sure if the problem is related to usb(4) or snd(4).
I'm trying to get the microphone of a webcam working (it's
a Logitech C210). When I load snd_uaudio(4), it is found
uaudio0: <vendor 0x046d product 0x0819, class 239/2, rev 2.00/0.10, addr 2> on usbus3
uaudio0: No playback!
uaudio0: Record: 48000 Hz, 1 ch, 16-bit S-LE PCM format
uaudio0: No midi sequencer
pcm5: <USB audio> on uaudio0
Interestingly, I got only a new mixer device, but no new
crw-rw-rw- 1 root wheel 0, 144 Apr 11 22:39 mixer5
And /dev/sndstat says this ("pcm5" is the cam's microphone):
FreeBSD Audio Driver (newpcm: 32bit 2009061500/i386)
pcm0: <HDA ATI RS690/780 HDMI PCM #0 HDMI> (play)
pcm1: <HDA Realtek ALC892 PCM #0 Analog> (play/rec) default
pcm2: <HDA Realtek ALC892 PCM #1 Analog> (play/rec)
pcm3: <HDA Realtek ALC892 PCM #2 Digital> (play)
pcm4: <HDA Realtek ALC892 PCM #3 Digital> (play)
pcm5: <USB audio> (rec)
And finally, mixer -f /dev/mixer5 says:
Mixer vol is currently set to 75:75
Mixer pcm is currently set to 75:75
There seems to be no recording source configured:
"mixer -f /dev/mixer5 recsrc" produces no output. Also,
I cannot set any recording source. But I guess that's OK
because there really is only _one_ fixed recording source
supported by that device.
Strangely, after a few minutes, a dsp device appeared.
Something must have triggered that, but I have no idea what.
Maybe it just took that long because something hung inside
the driver and finally ran into a timeout ... But that's
just a guess.
crw-rw-rw- 1 root wheel 0, 145 Apr 11 22:48 dsp5.0
However, the device doesn't work. When I tried to do a
test recording with skype, nothing got recorded, and the
following was logged:
pcm5: chn_read(): pcm5:virtual:dsp5.vr0: record interrupt timeout, channel dead
Does anyone have an idea what to do to get it working?
I'm running a fairly new FreeBSD/i386 8-stable (2011-03-19).
Alternatively, any recommendation for a new USB microphone
to buy that works well with FreeBSD 8?
(By the way, I tried connecting an old analog microphone to
my mainboard's mic input, but it records only silence,
except when I blow directly into the microphone, no matter
what mixer settings I've tried. So I guess that that mic
input of my mainboard doesn't work correctly with FreeBSD
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M.
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possible; actually showing the stuff should be considered a
criminal offence" -- Jacek Generowicz
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