On Sat, Mar 04, 2023 at 06:21:08PM +0100, Jan Stary wrote:
> > I have two devices around here. Let's call one devA and one devB.
> > devB is my main OpenBSD workstation devA is some kind of gaming device
> > which has a normal 2 channel audio jack. I want to connect the line out
> > connector of devA to the line-in of devB and listen to both devices
> > with my headphone amplifier connected to out/spdif of devB.
>
> Why do you want that? I mean, what are the two simultaneous things
> you want to listen to, one comming from your game console and one
> from your workstation?
Mostly it's running an audio player, a voip application or video player
on my workstation while playing on the other device.
> > In analog mode this works beside the poor quality of the mainboard
> > which seems to generate a lot of noise.
>
> That's not poor quality of the mainboard,
> that's an electronic device suffering a _lot_
> of interference from the electronics jungle around it.
Isn't the board shielded inside it's case? (metal) Around the metal case
there is also a small rack where the only other component running is a
small switch? My guess would have been that the case and the rack should
shield the internal components so the inteference must be coming from
the board itself? If that's not the case, is there something I can do to
improve the situation? I've often read about audio components on
mainboards being badly shielded from other components so assumed it
maybe coming from those. Could a dedicated sound card maybe fix that,
provided it got better shielding?
> > When switching to SPDIF the noise is gone
>
> Yes: the digital signal does not suffer from the analog noise.
Of course, bad worded from my side. I wanted to point out that
nothing, not even noise from devA out is coming with that signal.
>
> Does you headphone amplifier take the spdif output of your workstation?
> (What headphone amplifier is that?)
The headphone amplifier is a beyerdynamic A20 which takes two analog RCA
inputs. I was a bit testing and had a 24bit/192khz DAC laying
around and put it in between with a very short RCA cable to get rid of
that noise. Not ideal but worked as the digital signal of course not
suffers from analog noise and the analog part is only 0.3m long now.
> > but the line-in output is gone too.
>
> Meaning, you still hear the sounds that your workstation produces,
> but not the sound your gaming console sends to your line-in?
Exact
> > I switched to SPDIF with the following mixerctl(8) command
> > `mixerctl -t outputs.mode=digital`
> >
> > I tried to set the "SPDIF_source" to something different but mixerctl
> > states "Bad enum value ...". Is there any chance to mix the line-in
> > with the default output like I did in analog mode? What am I missing
> > here? In azalia(4) the outputs.mode and record.mode can both be set to
> > analog or digital
>
> I see no record.mode in the mixerctl settings.
>
> > as far as I unterstand line-in should be record?
>
> Your mixerctl says it's an input.
>
> > mixerctl -a
>
> mixerctl -av might be more telling.
Thanks, how could I overlook that...
---
inputs.dac-0:1=126,126
inputs.dac-4:5=126,126
inputs.dac-2:3=126,126
inputs.dac-6:7=126,126
record.adc-0:1_mute=off [ off on ]
record.adc-0:1=128,128
record.adc-2:3_mute=off [ off on ]
record.adc-2:3=128,128
inputs.mix_source=mic,mic2,line-in,hp,line2,line3 { mic mic2 line-in hp
line2 line3 }
inputs.mix_mic=120,120
inputs.mix_mic2=120,120
inputs.mix_line-in=120,120
inputs.mix_hp=120,120
inputs.mix_line2=120,120
inputs.mix_line3=120,120
inputs.mix2_source=dac-0:1,mix { dac-0:1 mix }
inputs.mix3_source=dac-4:5,mix { dac-4:5 mix }
inputs.mix4_source=dac-2:3,mix { dac-2:3 mix }
inputs.mix5_source=dac-6:7,mix { dac-6:7 mix }
outputs.line_source=mix2 [ mix2 ]
outputs.line_mute=off [ off on ]
outputs.line_boost=off [ off on ]
outputs.line_eapd=on [ off on ]
outputs.line2_source=mix3 [ mix3 ]
outputs.line2_mute=off [ off on ]
outputs.line2_dir=output [ none output input ]
outputs.line3_source=mix4 [ mix4 ]
outputs.line3_mute=off [ off on ]
outputs.line3_dir=output [ none output input ]
outputs.mic_source=mix8 [ mix2 mix3 mix4 mix5 mix8 ]
outputs.mic_mute=off [ off on ]
inputs.mic=85,85
outputs.mic_dir=input-vr80 [ none output input input-vr0 input-vr50
input-vr80 input-vr100 ]
outputs.mic2_source=mix2 [ mix2 mix3 mix4 mix5 mix8 ]
outputs.mic2_mute=off [ off on ]
inputs.mic2=85,85
outputs.mic2_dir=input-vr80 [ none output input input-vr0 input-vr50
input-vr80 input-vr100 ]
outputs.mic2_boost=off [ off on ]
outputs.line-in_source=mix2 [ mix2 mix3 mix4 mix5 mix8 ]
outputs.line-in_mute=off [ off on ]
inputs.line-in=85,85
outputs.line-in_dir=input [ none output input input-vr0 input-vr50
input-vr80 input-vr100 ]
outputs.hp_source=mix5 [ mix2 mix3 mix4 mix5 mix8 ]
outputs.hp_mute=off [ off on ]
inputs.hp=85,85
outputs.hp_dir=output [ none output input input-vr0 input-vr50
input-vr80 input-vr100 ]
outputs.hp_boost=off [ off on ]
outputs.hp_eapd=on [ off on ]
outputs.SPDIF_source=dig-dac-0:1 [ dig-dac-0:1 ]
record.adc-2:3_source=mic,mic2,line-in,hp,line2,line3,mix { mic mic2
line-in hp line2 line3 mix }
record.adc-0:1_source=mic,mic2,line-in,hp,line2,line3,mix { mic mic2
line-in hp line2 line3 mix }
inputs.dac-8:9=126,126
inputs.mix8_source=dac-8:9,mix { dac-8:9 mix }
outputs.line_sense=unplugged [ unplugged plugged ]
outputs.line2_sense=unplugged [ unplugged plugged ]
outputs.line3_sense=unplugged [ unplugged plugged ]
outputs.mic_sense=unplugged [ unplugged plugged ]
outputs.mic2_sense=unplugged [ unplugged plugged ]
outputs.line-in_sense=plugged [ unplugged plugged ]
outputs.hp_sense=unplugged [ unplugged plugged ]
outputs.master=126,126
outputs.master.mute=off [ off on ]
outputs.master.slaves=dac-0:1,dac-6:7,line,hp { dac-0:1 dac-4:5 dac-2:3
dac-6:7 line line2 line3 mic mic2 line-in hp dac-8:9 }
record.volume=128,128
record.volume.mute=off [ off on ]
record.volume.slaves=adc-0:1,adc-2:3 { adc-0:1 adc-2:3 mic mic2 line-in
hp }
outputs.mode=digital [ analog digital ]
record.enable=sysctl [ off on sysctl ]
---
Looks like '.SPDIF_source' can only take 'dig-dac-0:1' which is channel
1 and 2, so no monitoring of line-in when running in digital mode if I
interpret that output correctly?
Thanks for your reply
nebulo
