ASLA - Pulseaudio Cheatsheet
Summary
Piping other application audio into your microphone!
ASLA - PulseAudio CheatSheet
This is very Informal, just a bunch of useful commands and scripts. I will add some structure later. (Once I get this all figured out) Ubuntu 18.04 Bionic
ASLA
Advanced Linux Sound Architecture (ALSA) is a software framework and part of the Linux kernel that provides an application programming interface (API) for sound card device drivers.
Tools:
alsamixer
- Mixer
arecord -r 41000 -d 900 test.wav
- command-line sound recorder for ALSA soundcard driver
aplay test.wav
- command-line sound player for ALSA soundcard driver
Pulse Audio
PulseAudio is a network-capable sound server program distributed via the freedesktop.org project. In broad terms ALSA is the sound hardware driver and PulseAudio is the interface engine between Applications and ALSA. It is the default sound server in Ubuntu and Arch Linux.
pacmd
- Reconfigure a PulseAudio sound server during runtime
pactl
- Control a running PulseAudio sound server
- only exposes a subset of the available operations. For the full set use the
pacmd
pulseaudio -k
- kills and restarts pulseaudio
pacmd list-sources |grep name:
- Find the
name:of your microphone
pacmd list-sinks |grep name:
- Find the
name:of your speakers/headphones
Functional PulseAuido Bash Script:
- Used for taking audio output from mp3/youtube/whatever and bridge it on to your Mic
- once pavucontrol opens play your music and select vsink_fx
#!/bin/bash # Kill pulseaudio pulseaudio -k # Kill OpenVpn sudo service openvpn stop # Declare your microphone and speakers MICROPHONE="alsa_input.usb-Apple_Inc._Display_Audio_30D6B202-00.analog-mono" #SPEAKERS="alsa_output.usb-Apple_Inc._Display_Audio_30D6B202-00.analog-stereo" SPEAKERS="alsa_output.pci-0000_00_1b.0.analog-stereo" # Create the virtual sinks pactl load-module module-null-sink sink_name=vsink_capture sink_properties=device.description="vsink_capture" pactl load-module module-null-sink sink_name=vsink_fx sink_properties=device.description="vsink_fx" pactl load-module module-null-sink sink_name=vsink_fx_mic sink_properties=device.description="vsink_fx_mic" pactl load-module module-null-sink sink_name=vsink_fx_to_spk sink_properties=device.description="vsink_fx_to_spk" #pactl set-sink-volume vsink_fx_to_spk '40%' # Create a combination virtual sink pactl load-module module-combine-sink sink_name=capture_combined slaves=vsink_capture,vsink_fx_to_spk # Create the loopbacks pactl load-module module-loopback sink=vsink_fx_mic source="$MICROPHONE" pactl load-module module-loopback sink=vsink_fx_mic source=vsink_fx.monitor pactl load-module module-loopback sink=vsink_fx_to_spk source=vsink_fx.monitor pactl load-module module-loopback sink="$SPEAKERS" source=vsink_fx_to_spk.monitor # Open pavucontrol pavucontrol
DIAGRAM:
+-------------+ +-------------+
| Recording | | Video Chat |
| Application | | Application |
+------^------+ | Playback |
| +-----+-------+
| |
| |
+------+--------+ +------v-----------+
| | | |
| vsink_capture <------+ capture_combined |
| | | |
+---------------+ +------+-----------+
|
|
|
+--------v----------+
| | +---------------------+
| vsink_fx_to_spk +---> Speakers/Headphones |
| | +---------------------+
+-------^-----------+
|
|
+-------------+ +------------+ +-------+----------+ +-------------+
| Music | | | | | | Video Chat |
| Application +-----> vsink_fx +------> vsink_fx_mic +----> Application |
| Playback | | | | | | Recording |
+-------------+ +------------+ +-------^----------+ +-------------+
|
|
+-----+------+
| Microphone |
+------------+