While troubleshooting some audio issues, I noticed that the values of
play.bytes and record.bytes in audioctl's output were identical, even
when only playing audio.
1) Is this expected behavior?
2) What is the source of this data (record.bytes)?
I found it interesting that the values were the same, so I took a look
at mixerctl, and noticed that 'line' (which is an output) and 'mix'
(which has line as its only source) were the sources for both
record.adc variables. At that point I figured that simply removing
all sources from those two variables would eliminate all audio data
from those recording channels, but record.bytes continued to match
play.bytes. I even attempted to mute both ADCs and to disable recording
in mixerctl (without rebooting), but nothing changed.
I'm probably going to remove 'line' and 'mix' as sources for the ADCs
because they don't make sense there, but I'm still hoping to understand
what's going on.
# mixerctl -v
inputs.dac-2:3=126,126
inputs.dac-0:1=126,126
record.adc-0:1_mute=off [ off on ]
record.adc-0:1=124,124
record.adc-2:3_mute=off [ off on ]
record.adc-2:3=124,124
inputs.mix_source=line { line }
inputs.mix_line=120,120
inputs.mix2_source=dac-2:3 { dac-2:3 mix }
inputs.mix3_source=dac-0:1 { dac-0:1 mix }
outputs.spkr_source=mix2 [ mix2 ]
outputs.spkr_mute=on [ off on ]
outputs.spkr_eapd=on [ off on ]
outputs.line_source=mix3 [ mix2 mix3 ]
outputs.line_mute=off [ off on ]
inputs.line=85,85
outputs.line_dir=output [ none output input input-vr0 input-vr50
input-vr80 input-vr100 ]
outputs.line_boost=off [ off on ]
outputs.line_eapd=on [ off on ]
outputs.hp_source=mix2 [ mix2 mix3 ]
outputs.hp_mute=off [ off on ]
outputs.hp_boost=off [ off on ]
outputs.hp_eapd=on [ off on ]
record.adc-2:3_source=line,mix { line mix }
record.adc-0:1_source=line,mix { line mix }
outputs.line_sense=plugged [ unplugged plugged ]
outputs.hp_sense=unplugged [ unplugged plugged ]
outputs.spkr_muters=line,hp { line hp }
outputs.master=126,126
outputs.master.mute=off [ off on ]
outputs.master.slaves=dac-2:3,dac-0:1,spkr,line,hp { dac-2:3 dac-0:1
spkr line hp }
record.volume=124,124
record.volume.mute=off [ off on ]
record.volume.slaves=adc-0:1,adc-2:3 { adc-0:1 adc-2:3 line }
record.enable=sysctl [ off on sysctl ]
