A more advanced form of mute-unmute, with true PTT functionality

mic-control.sh

#!/usr/bin/env bash

## usage: after installation, microphone is unmuted only while you
##        press the key specified here. shift+hotkey will lock the microphone state
## note that this only works consistently as long as you use this
## script and/or keybindings; it won't update state if you use pavucontrol
## or other method to mute/unmute.
##
## installation: ideally, just run this script from a terminal with the install parameter.
## if that fails for whatever reason, refer to 
## https://www.reddit.com/r/linux_gaming/comments/7uaki4/psa_control_mute_push_to_talk_or_whatever_on/
## as a starting point
##
## Also see https://wiki.archlinux.org/index.php/Xbindkeys for more info on xbindkeys

HOTKEY="XF86HomePage" # use `xbindkeys --multikey` to find what key you want to bind to

CARD_IDX="@DEFAULT_SOURCE@" 
# if the default is not the one you try to control, use `pacmd list-sources` to find out the index

STATUS_FILE="$XDG_RUNTIME_DIR/micmute_status" # temp file to store state
INDICATOR_LED="2" # 0: num, 1: caps, 2: scroll lock
LED_WHEN_MUTED="off"
LED_WHEN_UNMUTED="on"

mute() {
        echo muting.
        pacmd set-source-mute $CARD_IDX 1
        xset -led $INDICATOR_LED led $LED_WHEN_MUTED
        echo 1 > "$STATUS_FILE"
}

unmute() {
        echo unmuting.
        pacmd set-source-mute $CARD_IDX 0
        xset -led $INDICATOR_LED led $LED_WHEN_UNMUTED
        echo 0 > "$STATUS_FILE"
}

toggle() {
        pactl set-source-mute $CARD_IDX toggle
}

toggle() {
        touch "$STATUS_FILE"

        if [ "$(cat $STATUS_FILE)" -eq 1 ]
                then
                        unmute
                else
                        mute
        fi
}

if [ "$1" = "mute" ]
then
        mute
        exit 0
fi

if [ "$1" = "unmute" ]
then
        unmute
        exit 0
fi

if [ "$1" = "toggle" ]
then
        toggle
        exit 0
fi

if [ "$1" = "install" ]
then
        XBKRC="$HOME/.xbindkeysrc"
        if [ "$2" != "" ]
        then
                HOTKEY="$2"
        fi

        if [ "$(grep PTT $XBKRC | wc -l)" -gt 0 ]
        then
                echo Ooops! Looks like there is already a PTT functionality in your .xbindkeysrc
                echo This script isn\'t smart enough to deal with such situations.
                echo
                echo Please edit $XBKRC manually.
                exit 1
        fi

        echo Installing into $XBKRC, using $HOTKEY as hotkey
        cat >> "$XBKRC" <<EOF

# unmute mic (PTT)
"$0 unmute"
  Mod2 + $HOTKEY

# mute mic (PTT)
"$0 mute"
  Mod2 + $HOTKEY + Release

# toggle mic mute
"$0 toggle"
  Shift+Mod2 + $HOTKEY

EOF
        chmod +x "$0"
        echo "Make sure to run xbindkeys when you start your X session (xprofile or xinitrc)"
        xbindkeys --poll-rc
        exit 0
fi


echo "Usage: $0 <mute|unmute|toggle|install>"
echo "Got: \"$*\""
exit 1