Date: Tue, 26 Jun 2012 17:34:59 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-multimedia@freebsd.org Subject: [HOWTO] How to duplicate USB audio output Message-ID: <201206261734.59309.hselasky@c2i.net>
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Hi,
You've maybe wondered how you can duplicate the USB audio output without too
much hassle. Here is a quick HOWTO using 8-stable, 9-stable or 10-current.
1) su
2) usbconfig
Locate your USB audio device, for example ugen4.2.
ugen4.2: <USB Headset> at usbus6, cfg=0 md=HOST spd=FULL (12Mbps) pwr=ON
3) Locate output format for USB audio device
dmesg | grep -C 10 ugen4.2
uaudio0: Play: 48000 Hz, 2 ch, 16-bit S-LE PCM format.
uaudio0: Record: 48000 Hz, 1 ch, 16-bit S-LE PCM format.
uaudio0: No midi sequencer.
4) Install /usr/ports/audio/sox
5) Playback something on your USB device
6) Locate the USB audio endpoint used:
usbdump -i usbus4 -f 2 -v
usbus4.2 SUBM-ISOC-EP=00000001,SPD=FULL,NFR=8,SLEN=1536,IVAL=0
^^ endpoint number in hex
7) Redirect audio output by use of usbdump from device 4.2 and endpoint 1 to
another audio device in raw binary format:
usbdump -s 65536 -i usbus4 -f 2.1 -b /dev/stdout | \
env AUDIODEV=/dev/dsp1 play -c 2 -r 48000 -b 16 -t raw -s /dev/stdin
Good luck!
--HPS
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