PulseAudio listen to line in and mic simultaneously

[rosshid]

Hi all,

I'm trying to get pulseaudio in Fedora 16 to capture both the line-in and mic ports on an intel-hda (ALC889A) - alsa & windows have no problem capturing all three source ports (inputs) on the card but pulseaudio is proving more difficult. Line in is connected to a set top box, and mic is connected to a internet enabled TV. In pavucontrol, under input devices, my internal analog stereo card shows up, but only one port can be selected (Line in, Microphone 1, or Microphone 2) - so I can only hear (using loopback module) line in OR mic input, not both.

If it's not possible to use pulseaudio to capture from both ports simultaneously, then figuring out how to switch the port from the commandline would help. That way I can use LIRC's irexec to switch the port remotely, so I don't have to fumble around with pavucontrol everytime I switch devices.

pacmd list-sources

arecord -l

It seems only one port can be active at a time, meaning I can only listen to one port at a time. This has to be pretty common, considering most cards are capable of capturting from multiple sources - #pulseaudio on freenode had no idea on how to do this.

Any help is greatly appreciated.

[Thetargos]

I am trying to achieve something similar, but only with the Line-In port, and I noticed that I coudln't hear what is being captured on the port, unless I "recorded" it and played it back. How did you manage to capture and listen?

It would be very interesting to actually know how to do what you originally inquired about.

[rosshid]

To listen to an input source in pulseaudio is simple -

[user@host dir]$ pacmd load-module module-loopback

Then in pavucontrol under playback select "Show all" and find the loopback module, then select your output sink, in the record tab, select "Show All", select your input source. You can also put the "load-module module-loopback" command in /etc/pulse/default.pa .

The problem I'm having is that my sound card has multiple inputs, only one of which can be selected at any one time. Luckily I hooked up an HDMI with audio to a new STB I have, and now my TV mixes the STB and it's own audio on the audio output on the TV. I also hacked together a bash script which is executed by irexec using my TV remote which changes the source port on button press. Here's the script:

pulse-toggle-port.sh:


and this is in .lircrc:

begin
  prog = irexec
  button = KEY_MEDIA_REPEAT
  config = /home/user/.lirc/pulse-toggle-port.sh
end