Audio / Video profile switcher script

av-profile.sh

#!/bin/bash

# A script for setting audio video profiles and launching applications. For
# example, since my webcam is in my laptop. I'd like my Google Meet window to
# be on the laptop too, so I can look at the webcam.

set -e

declare -A SCREEN_LAYOUTS
declare -A SCREEN_COORDS
declare -A SOUND_OUTPUTS

# Use arandr to setup your displays and then export the profile
SCREEN_LAYOUTS[external_only]="
    --output HDMI-2 --off 
    --output DP-1 --off
    --output DP-2 --off
    --output eDP-1 --off
    --output HDMI-1 --primary --mode 1920x1080 --pos 0x0 --rotate normal
"
SCREEN_LAYOUTS[external_left]="
    --output HDMI-2 --off
    --output DP-1 --off
    --output DP-2 --off
    --output HDMI-1 --primary --mode 1920x1080 --pos 0x0 --rotate normal
    --output eDP-1 --mode 1920x1080 --pos 1920x0 --rotate normal
"

# Screen coordinates for moving windows to a different screen. These are
# coordinates on a virtual desktop that is stretched over all monitors; either
# vertically or horizontally, depending on the screen layout.
SCREEN_COORDS[laptop]="0,1920,0,500,500"
SCREEN_COORDS[external]="0,0,0,500,500"

# This requires a bit of a PhD in pulse audio. There has to be a better way
# Mike!
SOUND_OUTPUTS[headphones]="
    pacmd set-card-profile alsa_card.usb-Logitech_Logitech_USB_Headset-00 output:analog-stereo+input:analog-mono;
    pacmd set-card-profile 0 output:analog-stereo+input:analog-stereo;
    pacmd set-default-sink alsa_output.usb-Logitech_Logitech_USB_Headset-00.analog-stereo;
"
SOUND_OUTPUTS[external_monitor]="
    pacmd set-card-profile alsa_card.usb-Logitech_Logitech_USB_Headset-00 off;
    pacmd set-card-profile 0 output:hdmi-stereo;
    pacmd set-default-sink alsa_output.pci-0000_00_1f.3.hdmi-stereo;
"

# Return the X11 window ID for a window who's title matches
get_win_id () {
    TITLE="$1"
    echo "$(xdotool search "$TITLE" 2>/dev/null| head -n1)"
}

# Switch to one of the predefined layout screens
screen_layout () {
    LAYOUT="$1"

    echo "Switching screen layout to $LAYOUT"
    xrandr ${SCREEN_LAYOUTS[$LAYOUT]}
}

# Switch the sound output to the given profile
sound_output () {
    PROFILE="$1"
    eval ${SOUND_OUTPUTS[$PROFILE]}
}

# Kill a window
win_kill () {
    TITLE="$1"
    XWINID="$(get_win_id "$TITLE")"
    if [ -n "$XWINID" ]; then
        echo "Killing window $XWINID ($TITLE)"
        wmctrl -ic $XWINID
    fi
}

# Move a window to a particalar virtual desktop
win_to_desktop () {
    TITLE="$1"
    DESKTOP="$(expr $2 - 1)"  # Indexed from 0

    XWINID="$(get_win_id "$TITLE")"
    echo "Moving window $XWINID ($TITLE) to desktop $DESKTOP"
    wmctrl -ir $XWINID -t $DESKTOP
}

# Move a window to a different screen
win_to_screen () {
    set -x
    TITLE="$1"
    SCREENNAME="$2"

    XWINID="$(get_win_id "$TITLE")"
    echo "Moving window $XWINID ($TITLE) to screen $SCREENNAME"

    # Unmaximize the window so we can move it
    wmctrl -ir $XWINID -b remove,maximized_vert,maximized_horz

    # Move window to requested screen
    wmctrl -ir $XWINID -e ${SCREEN_COORDS[$SCREENNAME]}

    # Maximize the window
    wmctrl -ir $XWINID -b add,maximized_vert,maximized_horz

    set +x
}

# Keep a window on the current virtual desktop. This is useful for dual screen,
# when you don't want both screens to switch virtualdesktop. Kinda. It
# simulates it by making a window sticky.
win_sticky () {
    TITLE="$1"

    XWINID="$(get_win_id "$TITLE")"
    echo "Making window $XWINID ($TITLE) sticky"
    wmctrl -ir $XWINID -b add,sticky
}

# See above
win_unsticky () {
    TITLE="$1"

    XWINID="$(get_win_id "$TITLE")"
    echo "Making window $XWINID ($TITLE) unsticky"
    wmctrl -ir $XWINID -b remove,sticky
}

# Switch to, raise and focus window
win_focus () {
    TITLE="$1"

    XWINID="$(get_win_id "$TITLE")"
    echo "Focussing window $XWINID ($TITLE)"
    wmctrl -ia $XWINID
}


if [ "$1" = "" ]; then
    PROFILE="default"
else
    PROFILE="$1"
fi

echo "Setting profile $PROFILE..."

if [ "$PROFILE" = "default" ]; then
    win_kill "Google Meet"
    screen_layout "external_only"
elif [ "$PROFILE" = "radio" ]; then
    win_kill "Google Meet"
    screen_layout "external_only"
    sound_output "external_monitor"
    firefox -P webapp --new-window https://www.skyradio.nl/player
    win_to_desktop "www.skyradio.nl" 1
elif [ "$PROFILE" = "conference" ]; then
    win_kill "www.skyradio.nl"
    sound_output "headphones"
    screen_layout "external_left"
    firefox --new-window https://meet.google.com/landing?authuser=1
    sleep 1  # give firefox a moment
    win_to_screen "Google Meet" "laptop"
    win_sticky "Google Meet"
    win_focus "Google Meet"
elif [ "$PROFILE" = "conference-present" ]; then
    screen_layout "external_only"
    win_to_screen "Google Meet" "external"
    win_unsticky "Google Meet"
    win_to_desktop "Google Meet" 3
    win_focus "Google Meet"
else
    echo "Invalid profile: $PROFILE" >&2
    exit 1
fi