Setting Digital Stereo (IEC958) Profile in PipeWire

Ask Fedora
, , ,
1

I am trying to configure PipeWire to use my sound card’s digital output. Audio works via the PC’s line-out jack, but not the S/PDIF optical port. This is the expected default configuration, but I am trying to enable the digital output.

ALSA appears to detect the capability for digital output:

[faokryn@localhost ~]$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [VG271U]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [VG272U]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 9: HDMI 3 [HDMI 3]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
[faokryn@localhost ~]$ aplay -L | grep -v surround | grep CARD=PCH -A 2
sysdefault:CARD=PCH
    HDA Intel PCH, ALC892 Analog
    Default Audio Device
front:CARD=PCH,DEV=0
    HDA Intel PCH, ALC892 Analog
    Front output / input
--
iec958:CARD=PCH,DEV=0
    HDA Intel PCH, ALC892 Digital
    IEC958 (S/PDIF) Digital Audio Output

but PipeWire/WirePlumber only has an “Analog Stereo” version of “Built-in Audio”:

[faokryn@localhost ~]$ wpctl status
PipeWire 'pipewire-0' [0.3.65, faokryn@localhost, cookie:2367182353]
 └─ Clients:
        31. WirePlumber                         [0.3.65, faokryn@localhost, pid:6180]
        32. WirePlumber [export]                [0.3.65, faokryn@localhost, pid:6180]
        61. wpctl                               [0.3.65, faokryn@localhost, pid:6196]

Audio
 ├─ Devices:
 │      40. TU116 High Definition Audio Controller [alsa]
 │      41. HD Pro Webcam C920                  [alsa]
 │      42. Built-in Audio                      [alsa]
 │  
 ├─ Sinks:
 │      45. TU116 High Definition Audio Controller Digital Stereo (HDMI) [vol: 0.40]
 │  *   47. Built-in Audio Analog Stereo        [vol: 0.40]
 │  
 ├─ Sink endpoints:
 │  
 ├─ Sources:
 │  *   46. HD Pro Webcam C920 Analog Stereo    [vol: 1.00]
 │      48. Built-in Audio Analog Stereo        [vol: 1.00]
 │  
 ├─ Source endpoints:
 │  
 └─ Streams:

Video
 ├─ Devices:
 │      38. HD Pro Webcam C920                  [v4l2]
 │      39. HD Pro Webcam C920                  [v4l2]
 │  
 ├─ Sinks:
 │  
 ├─ Sink endpoints:
 │  
 ├─ Sources:
 │  *   43. HD Pro Webcam C920 (V4L2)          
 │  
 ├─ Source endpoints:
 │  
 └─ Streams:

Settings
 └─ Default Configured Node Names:
         0. Audio/Sink    alsa_output.pci-0000_00_1b.0.analog-stereo

I can’t seem to find information on how to get WirePlumber to detect and use this profile- basically the equivalent of pactl --set-card-profile with PulseAudio.

Can anyone advise me or point me in the right direction? Thanks