Pulseaudio does not create a separate source for each input subdevice on a card
Submitted by ror..@..il.com
Assigned to pul..@..op.org
Description
I am using Pulseaudio 1:8.0-0ubuntu3 on ubuntu xenial. My built in sound card has two analog input devices, one with a single subdevice, and the other with two subdevices. Here is the output of arecord -l: $ arecord -l **** List of CAPTURE Hardware Devices **** card 0: SB [HDA ATI SB], device 0: ALC889A Analog [ALC889A Analog] Subdevices: 0/1 Subdevice #0: subdevice #0 card 0: SB [HDA ATI SB], device 1: ALC889A Digital [ALC889A Digital] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: SB [HDA ATI SB], device 2: ALC889A Alt Analog [ALC889A Alt Analog] Subdevices: 2/2 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1
$ pactl list short sources
4 alsa_output.pci-0000_00_14.2.iec958-stereo.monitor module-alsa-card.c s16le 2ch 48000Hz RUNNING 5 alsa_input.pci-0000_00_14.2.analog-stereo module-alsa-card.c s16le 2ch 48000Hz RUNNING
I would expect Pulseaudio (perhaps module-udev-detect?) to detect and create 3 input sources to allow access to all three subdevices (hw:0,0,0; hw:0,2,0; hw:0,2,1). This would allow me to record from all three analog input ports at once. However, it seems that pulseaudio stops looking after it finds the first subdevice (hw:0,0,0)
alsamixer detects all three capture ports, and allows me to assign each capture port to a separate input source.
pavucontrol allows me to switch between capture ports on a single input source. I could understand this for devices with only a single capture subdevice, but it is severely limiting for a device with more than one capture subdevice. I wish to use pulseaudio as a mixer for three loopback sources on my HTPC: a Chromecast audio, my TV, and a phono amp.