Virtual Sink/Mic Script for PipeWire

v.sh

#!/usr/bin/env bash
set -euo pipefail

LOCKDIR="/tmp/viraudio"
mkdir -p "$LOCKDIR"

command -v pactl >/dev/null || { echo "Missing pactl, please install it first." >&2; exit 1; }

usage() {
  cat <<EOF
Usage:
  $0 sink [NAME]
  $0 mic [NAME]
  $0 del <NAME>
  $0 rm <NAME>
  $0 rm --all
  $0 rm --all --sink
  $0 rm --all --mic

Source: https://gist.github.com/wyf9/ff12240ae023da0a068f2466968e3681
Help: https://wyf9.top/p/virtual-sink#usage
EOF
  exit 1
}

die() {
  echo "$*" >&2
  exit 1
}

lock_file() {
  local type="$1"
  local name="$2"
  printf '%s/viraudio-%s-%s-%s.lock' "$LOCKDIR" "$USER" "$name" "$type"
}

exists_name() {
  local name="$1"
  [[ -f "$(lock_file sink "$name")" || -f "$(lock_file mic "$name")" ]]
}

generate_name() {
  local type="$1"
  local prefix
  case "$type" in
    sink) prefix="Virtual Sink" ;;
    mic) prefix="Virtual Mic" ;;
  esac
  local i=1
  while exists_name "$prefix $i"; do
    ((i++))
  done
  echo "$prefix $i"
}

create_sink() {
  local name="${1:-}"

  if [[ -z "$name" ]]; then
    name=$(generate_name sink)
  fi

  if exists_name "$name"; then
    die "Virtual device '$name' already exists."
  fi

  local module_index
  module_index=$(
    pactl load-module module-null-sink \
      media.class=Audio/Sink \
      sink_name="$name" \
      sink_properties=device.description="$name"
  )

  printf '%s\n' "$module_index" > "$(lock_file sink "$name")"
  echo "Created virtual sink '$name' (module $module_index)."
}

create_mic() {
  local name="${1:-}"

  if [[ -z "$name" ]]; then
    name=$(generate_name mic)
  fi

  if exists_name "$name"; then
    die "Virtual device '$name' already exists."
  fi

  local module_index
  module_index=$(
    pactl load-module module-null-sink \
      media.class=Audio/Source/Virtual \
      sink_name="$name" \
      sink_properties=device.description="$name"
  )

  printf '%s\n' "$module_index" > "$(lock_file mic "$name")"
  echo "Created virtual mic '$name' (module $module_index)."
}

remove_name() {
  local name="$1"
  local removed=0

  for type in sink mic; do
    local lf
    lf="$(lock_file "$type" "$name")"

    if [[ -f "$lf" ]]; then
      local module_index
      module_index="$(<"$lf")"
      pactl unload-module "$module_index"
      rm -f "$lf"
      echo "Removed virtual $type '$name' (module $module_index)."
      removed=1
    fi
  done

  if [[ $removed -eq 0 ]]; then
    die "No virtual sink or mic named '$name' found."
  fi
}

remove_all() {
  local type_filter="${1:-}"
  local types=()
  local removed=0

  if [[ -z "$type_filter" ]]; then
    types=(sink mic)
  else
    types=("$type_filter")
  fi

  for type in "${types[@]}"; do
    for lf in "$LOCKDIR"/viraudio-*"-$type".lock; do
      if [[ -f "$lf" ]]; then
        local module_index
        module_index="$(<"$lf")"
        local name
        name=$(basename "$lf" "-$type.lock" | sed "s/^viraudio-[^-]*-//")
        pactl unload-module "$module_index"
        rm -f "$lf"
        echo "Removed virtual $type '$name' (module $module_index)."
        removed=$((removed + 1))
      fi
    done
  done

  if [[ $removed -eq 0 ]]; then
    die "No virtual devices found."
  fi
  echo "Total removed: $removed."
}

if [[ $# -lt 1 ]]; then
  usage
fi

cmd="$1"
shift
name="$*"

case "$cmd" in
  sink)
    create_sink "$name"
    ;;
  mic)
    create_mic "$name"
    ;;
  del|rm)
    if [[ "$name" == "--all" ]]; then
      remove_all
    elif [[ "$name" == "--all --sink" ]] || [[ "$name" == "--sink --all" ]]; then
      remove_all sink
    elif [[ "$name" == "--all --mic" ]] || [[ "$name" == "--mic --all" ]]; then
      remove_all mic
    elif [[ -z "$name" ]]; then
      die "NAME required for del/rm, or use --all."
    else
      remove_name "$name"
    fi
    ;;
  *)
    usage
    ;;
esac