AAXtoMP3/AAXtoMP3.sh

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#!/usr/bin/env bash
set -o errexit -o noclobber -o nounset -o pipefail
codec=libmp3lame
extension=mp3
mode=chaptered
if [ "$#" -eq 0 ]; then
echo "Usage: bash AAXtoMP3.sh [--flac] [--single] AUTHCODE {FILES}"
exit 1
fi
if [[ "$1" = '--flac' ]]
then
codec=flac
extension=flac
shift
fi
if [[ "$1" == '--single' ]]
then
mode=single
shift
fi
if [ ! -f .authcode ]; then
auth_code=$1
shift
else
auth_code=`head -1 .authcode`
fi
debug() {
echo "$(date "+%F %T%z") ${1}"
}
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trap 'rm --recursive --force "${working_directory}"' EXIT
working_directory="$(mktemp --directory)"
metadata_file="${working_directory}/metadata.txt"
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save_metadata() {
local media_file
media_file="$1"
ffprobe -i "$media_file" 2> "$metadata_file"
}
get_metadata_value() {
local key
key="$1"
normalize_whitespace "$(grep --max-count=1 --only-matching "${key} *: .*" "$metadata_file" | cut --delimiter=: --fields=2 | sed -e 's#/##g;s/ (Unabridged)//' | tr -s '[:blank:]' ' ')"
}
get_bitrate() {
get_metadata_value bitrate | grep --only-matching '[0-9]\+'
}
normalize_whitespace() {
echo $*
}
for path
do
debug "Decoding ${path} with auth code ${auth_code}..."
save_metadata "${path}"
title=$(get_metadata_value title)
output_directory="$(dirname "${path}")/$(get_metadata_value genre)/$(get_metadata_value artist)/${title}"
mkdir -p "${output_directory}"
full_file_path="${output_directory}/${title}.${extension}"
ffmpeg -loglevel error -stats -activation_bytes "${auth_code}" -i "${path}" -vn -codec:a "${codec}" -ab "$(get_bitrate)k" "${full_file_path}"
debug "Created ${full_file_path}."
if [ "${mode}" == "chaptered" ]; then
debug "Extracting chapter files from ${full_file_path}..."
while read -r -u9 first _ _ start _ end
do
if [[ "${first}" = "Chapter" ]]
then
read -r -u9 _
read -r -u9 _ _ chapter
chapter_file="${output_directory}/${title} - ${chapter}.${extension}"
ffmpeg -loglevel error -stats -i "${full_file_path}" -ss "${start%?}" -to "${end}" -codec:a copy "${chapter_file}"
fi
done 9< "$metadata_file"
rm "${full_file_path}"
debug "Done creating chapters. Chaptered files contained in ${output_directory}."
fi
cover_path="${output_directory}/cover.jpg"
debug "Extracting cover into ${cover_path}..."
ffmpeg -loglevel error -activation_bytes "${auth_code}" -i "${path}" -an -codec:v copy "${cover_path}"
debug "Done."
rm "${metadata_file}"
done