listen.sh

#!/usr/bin/env bash

# Directs audio input (e.g. mic) to audio output (e.g. speakers),
# then sleeps forever. Stops audio redirection when it is killed.
# So, for example, plug your phone into the PC's mic, run 'listen',
# and listen to phone audio through your computer's speakers.
#
# Requires:
# sudo apt-get install pactl

set -e

module2=$(pactl load-module module-echo-cancel aec_method=webrtc aec_args="analog_gain_control=0")
module=$(pactl load-module module-loopback latency_msec=1 channels=1 channel_map=mono)

function cleanup {
    pactl unload-module $module
    pactl unload-module $module2
}

trap cleanup EXIT

sleep infinity