snd_uaudio monitor recording

[Marcel Bonnet]

On 25 July 2017 at 14:18, Hans Petter Selasky <hps at selasky.org> wrote:
>
> On 07/25/17 17:00, Marcel Bonnet wrote:
>>
>> Hi.
>>
>> I'd like to record to a file whatever the sound card is actually playing,
>> essentially when I am not using jackd server.
>> I don't know if I just did not figure how to do it, or if depends on a new
>> driver functionality ?
>> Thanks in advance,
>>
>
> You'd need to use virtual_oss to do that.
Thanks. But, I didn't understand how to use it. Can you help me, please?

I tried an example from the man page (I changed the sample rate,
because my USB Fast Track Pro is set to 44100 Hz):

[@machine tmp]$  virtual_oss -C 2 -c 2 -r 44100 -b 16 -s 1024 -f
/dev/dsp3.0 -w dsp.wav -d dsp
                         hw.snd.basename_clone: 1
sysctl: hw.snd.basename_clone=0: Operation not permitted
virtual_oss: Could not create CUSE DSP device

So, I tried with sudo:

[@machine tmp]$  sudo  virtual_oss -C 2 -c 2 -r 44100 -b 16 -s 1024 -f
/dev/dsp3.0 -w dsp.wav -d dsp
hw.snd.basename_clone: 1 -> 0
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy
virtual_oss: Could not open DSP device '/dev/dsp3.0': Device busy

I never know why I have so much /dev/dsp3.x units. When using jack
server, I always attach to the first one (3.0) and it is ok. I tried
the other 3.x units, with no success.

Thanks in advance.

My environment:

[@machine tmp]$  ls /dev/dsp* ; cat /dev/sndstat ; sysctl hw.snd.default_unit

/dev/dsp0.1  /dev/dsp1.1  /dev/dsp2.1  /dev/dsp3.0  /dev/dsp3.1
/dev/dsp3.2  /dev/dsp3.3

FreeBSD Audio Driver (64bit 2009061500/amd64)
Installed devices:
pcm0: <Realtek ALC269 (Analog)> on hdaa0  (1p:2v/1r:1v)
pcm1: <Realtek ALC269 (Analog)> on hdaa0  (1p:1v/1r:1v)
pcm2: <Intel Panther Point (HDMI/DP 8ch)> on hdaa1  (1p:1v/0r:0v)
pcm3: <USB audio> at ? kld snd_uaudio (1p:2v/1r:1v) default
No devices installed from userspace.

hw.snd.default_unit: 3

[@machine tmp]$  sysctl dev.pcm.3
dev.pcm.3.feedback_rate: 0
dev.pcm.3.bitperfect: 0
dev.pcm.3.buffersize: 0
dev.pcm.3.rec.vchanformat: s16le:2.0
dev.pcm.3.rec.vchanrate: 44100
dev.pcm.3.rec.vchanmode: fixed
dev.pcm.3.rec.vchans: 1
dev.pcm.3.play.vchanformat: s16le:2.0
dev.pcm.3.play.vchanrate: 44100
dev.pcm.3.play.vchanmode: fixed
dev.pcm.3.play.vchans: 2
dev.pcm.3.hwvol_mixer: vol
dev.pcm.3.hwvol_step: 5
dev.pcm.3.%parent: uaudio0
dev.pcm.3.%pnpinfo:
dev.pcm.3.%location:
dev.pcm.3.%driver: pcm
dev.pcm.3.%desc: USB audio
>
> --HPS




-- 
Marcel Bonnet
github.com/marcelbonnet/