Audio Input fixer for AirPods users

README.md

Audio Input fixer for AirPods users

This is a Hammerspoon snippet with a utility script to fix the common problem with the AirPods where connecting AirPods to a MacBook forcibly switches the audio input device to the AirPods mic when you have a better mic on it.

Requirements

brew install hammerspoon jq switchaudio-osx

Installation

Install the fix_audio script: (~/bin can be anywhere else)

install -m 755 fix_audio.sh ~/bin/fix_audio

Configure Hammerspoon like so:

audio_settings_watcher = hs.pathwatcher.new(
  "/Library/Preferences/Audio/com.apple.audio.SystemSettings.plist",
  function (_files, _flagTables)
    local output, ok = hs.execute("/bin/zsh -lc " .. os.getenv("HOME") .. "/bin/fix_audio 2>&1")
    if output ~= "" then
      -- alert can be too noisy
      -- hs.alert.show(output)
      print(output)
    end
  end
)
audio_settings_watcher:start()

Author and License

Copyright (c) 2022 Akinori MUSHA

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

fix_audio.sh

#!/bin/sh

set -e

# If all of the input/output/system devices are set to AirPods, change the mic to a USB or builtin mic.
{
    SwitchAudioSource -c -t input -f json
    SwitchAudioSource -c -t output -f json
    SwitchAudioSource -c -t system -f json
} | jq -es 'map(select(.name | contains("AirPods"))) | length == 3' >/dev/null && {
    input_uid="$(
        SwitchAudioSource -a -t input -f json | \
            jq -rs 'map(. + {pri: (if .uid | startswith("AppleUSBAudioEngine:") then 2 elif .uid == "BuiltInMicrophoneDevice" then 1 else 0 end)}) | max_by(.pri) | .uid'
    )"

    SwitchAudioSource -u "$input_uid" -t input
}