pacmd with extensions

pacmdx

#!/bin/bash

# Copyright 2021 Google LLC.
# SPDX-License-Identifier: Apache-2.0

# This script provides a few extensions to pacmd, the tool used to reconfigure
# a running PulseAudio sound server during runtime.

# Added commands:
# exists-card           Checks if card exists (args: name)
# exists-sink           Checks if sink exists (args: name)
# exists-source         Checks if source exists (args: name)
# await-card            Blocks until card exists (args: name)
# move-all-to-sink      Set the default sink and move all sink inputs to it (args: index|name)
# move-all-to-source    Set the default source and move all source outputs to it (args: index|name)
# sinks-muted           Checks if all sinks are muted
# sources-muted         Checks if all sources are muted
# toggle-sinks-mute     Mutes or unmutes all sinks
# toggle-sources-mute   Mutes or unmutes all sources
# bluez-card-name       Generates card name used by bluez (args: mac)
# bluez-a2dp-sink-name  Generates an A2DP sink name used by bluez (args: mac)

# Unrecognized commands are passed to pacmd.

pacmd_exists() {
  [[ "${2}" ]] || die "Must specify ${1} name"
  pacmd "list-${1}s" | grep -Fq -e "name: <${2}>" -e "index: ${2}"
}

pacmd_await() {
  while ! pacmd_exists "${1}" "${2}"; do
    sleep 1
  done
}

pacmd_indexes() {
  pacmd "list-${1}s" | grep -Po 'index: \K\d+'
}

pacmd_move_all_to() {
  pacmd "set-default-${1}" "${3}" || exit 1
  for index in $(pacmd_indexes "${1}-${2}"); do
    pacmd "move-${1}-${2}" "$index" "${3}"
  done
}

pacmd_is_muted() {
  ! pacmd list-${1}s | grep -Pq 'muted:\s+no'
}

pacmd_mute() {
  for index in $(pacmd_indexes ${1}); do
    pacmd "set-${1}-mute" "$index" "${2}"
  done
}

pacmd_mute_toggle() {
  if pacmd_is_muted "${1}"; then
    pacmd_mute "${1}" false
  else
    pacmd_mute "${1}" true
  fi
}

bluez_name() {
  [[ "${2}" ]] || die "Must specify mac address"
  local address="${2//:/_}"
  case "$1" in
    card)
      local card="bluez_card.${address}"
      echo "$card"
      pacmd_exists card "$card"
      ;;
    a2dp_sink)
      local sink="bluez_sink.$address.a2dp_sink"
      echo "$sink"
      pacmd_exists sink "$sink"
      ;;
    hsp_sink)
      local sink="bluez_sink.$address.headset_head_unit"
      echo "$sink"
      pacmd_exists sink "$sink"
      ;;
    hsp_source)
      local source="bluez_source.$address.headset_head_unit"
      echo "$source"
      pacmd_exists source "$source"
      ;;
  esac
}

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

main() {
  case "$1" in
    exists-card)
      pacmd_exists card "$2"
      ;;
    exists-sink)
      pacmd_exists sink "$2"
      ;;
    exists-source)
      pacmd_exists source "$2"
      ;;
    await-card)
      pacmd_await card "$2"
      ;;
    move-all-to-sink)
      pacmd_move_all_to sink input "$2"
      ;;
    move-all-to-source)
      pacmd_move_all_to source output "$2"
      ;;
    sinks-muted)
      pacmd_is_muted sink
      ;;
    sources-muted)
      pacmd_is_muted source
      ;;
    toggle-sinks-mute)
      pacmd_mute_toggle sink
      ;;
    toggle-sources-mute)
      pacmd_mute_toggle source
      ;;
    bluez-card-name)
      bluez_name card "$2"
      ;;
    bluez-a2dp-sink-name)
      bluez_name a2dp_sink "$2"
      ;;
    bluez-hsp-sink-name)
      bluez_name hsp_sink "$2"
      ;;
    bluez-hsp-source-name)
      bluez_name hsp_source "$2"
      ;;
    *)
      pacmd "$@"
      ;;
  esac
}

main "$@"