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Subject: Re: snd_uaudio multichannel problems
To: =?UTF-8?Q?Goran_Meki=c4=87?= <meka@tilda.center>
References: <20161010173118.4lff7phfx2zqm6wz@hal9000.meka.no-ip.org>
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Cc: freebsd-usb@freebsd.org
From: Hans Petter Selasky <hps@selasky.org>
Message-ID: <650562fe-965e-d5bf-a1d2-77106cbfe91c@selasky.org>
Date: Tue, 11 Oct 2016 11:48:35 +0200
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On 10/11/16 11:12, Goran Mekić wrote:
> On Tue, Oct 11, 2016 at 11:15:01AM +0200, Hans Petter Selasky wrote:
>> What version of FreeBSD are you using?
> 11
>
>> How many channels of the 18 should jack be able to access?
> Ideally, all 18. I tried with -i 18 -o 18, but I get mono (left) channel only which is 2x the speed.
>

Hi,

By default virtual_oss only supports one sample rate. The -S option 
enables libsamplerate.

Try running this as root, assuming your DSP device is /dev/dspX .

kldload cuse

# Start virtual OSS like this. -M mirrors output from 0 && 1 to 6 && 7
virtual_oss \
  -S \
  -i 8 \
  -C 18 -c 18 -r 96000 -b 32 -s 1536 -f /dev/dspX \
  -c 2 -d dsp \
  -c 18 -d vdsp.jack \
  -M o,0,6,0,0,0 \
  -M o,1,7,0,0,0 \
  -t vdsp.ctl &

# Start jackd like this
jackd -r -d oss -i 18 -o 18 -w 32 -r 96000 \
   -C /dev/vdsp.jack -P /dev/vdsp.jack &

# You may also want to install the GUI, virtual_oss_ctl,
# which uses QT4/5:
svn --username anonsvn --password anonsvn \
       checkout svn://svn.turbocat.net/i4b/trunk

cd virtual_oss_ctl
make all
make install

Feel free to contribute manual page examples if you think the current 
documentation is not that well.

--HPS