Quadratic volume increase/decrease for PipeWire using Wireplumber

quadvol.sh

#!/usr/bin/env bash

# Quadratic volume setter

# USAGE:
# ./quadvol.sh [+/-]VOL
# NOTE: Does not support setting absolute volume

# Optionally change the volume cap
VOL_CAP=1.0

# Checks
CMD="$1"
if [[ ! "$CMD" =~ ^[+\-][01](.[0-9])?$ ]]; then
  echo "Command should have the format +/-[0.0 - $VOL_CAP]"
  exit 1
fi

# Parse command
AMOUNT=${CMD//[+\-]/}
ACTION=${CMD//[0-9.]/}

if awk "BEGIN {exit !($AMOUNT < 0.0 || $AMOUNT > $VOL_CAP)}"; then
  echo "Amount should be in the range 0.0 - $VOL_CAP"
  exit 1
fi

# Get volume and compute square root
CRT_VOL_LIN=$(wpctl get-volume @DEFAULT_SINK@ | cut -d' ' -f2)
CRT_VOL_QUAD=$(echo "$CRT_VOL_LIN" | awk '{print sqrt($0)}')

# Compute new volume
NEW_CRT_VOL_QUAD=$(awk "BEGIN {print ($CRT_VOL_QUAD $ACTION $AMOUNT)}")
NEW_CRT_VOL_LIN=$(awk "BEGIN {print ($NEW_CRT_VOL_QUAD ^ 2)}")

# New volume should be bound between 0.0 and $VOL_CAP
if awk "BEGIN {exit !($NEW_CRT_VOL_LIN < 0.0)}"; then
  NEW_CRT_VOL_LIN=0
elif awk "BEGIN {exit !($NEW_CRT_VOL_LIN > $VOL_CAP)}"; then
  NEW_CRT_VOL_LIN=1
fi

wpctl set-volume @DEFAULT_SINK@ "$NEW_CRT_VOL_LIN" -l "$VOL_CAP"