ref: f6b4d9b9dc53c2842b23dee80081cb5a874a1138
dir: /audio.ms/
# Audio
If the sound card is detected:
; ls '#A'
'#A/audio'
'#A/audioctl'
'#A/audiostat'
'#A/volume'
; ls /dev/audiostat
You can check which pins are being used for input and output (output for Thinkpad x200):
; cat /dev/audiostat
bufsize 1024 buffered 0
codec 0 pin 25 inpin 29
aout 16 c1d
aout 17 c1d
aout 18 211
beep 19 70000c
ain 20 100d1b ← pin 29, pin 23
ain 21 100d1b ← pin 24
pin 22 out jack ext right hpout green ← aout 16, aout 17
pin 23 in nothing sep rear micin pink
pin 24 in jack ext right micin pink
pin 25 out nothing sep rear hpout green ← aout 16, aout 17
pin 26 out fix int N/A speaker ? eapd ← aout 16, aout 17
pin 27 out nothing ext N/A other ? eapd ← aout 16, aout 17
pin 28 out nothing ext N/A other ? ← aout 18
pin 29 in fix int N/A micin ?
beep 30 f00000
outpath aout 16 → pin 26
outamp aout 16
inpath pin 29 → ain 20
inamp ain 20
This line `codec 0 pin 25 inpin 29` shows that pin 25 is being used for output and pin 29 used for input. On my laptop, it is necessary to set the output pin to 26:
; echo pin 26 > /dev/audioctl
Now it's possible to play music:
; audio/oggdec < music.ogg >/dev/audio
; audio/mp3dec < music.mp3 >/dev/audio
Sources:
* <http://nopenopenope.net/posts/audio>
* <https://git.sr.ht/~ft/jacksense>