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#!/usr/bin/env bash
# Craig Jennings <c@cjennings.net>
# Basically just a bash wrapper around a find/grep/awk command pipe
# to generate m3u playlists from video or audio files in a directory.
# One m3u playlist will be placed in the MUSIC_DIR, and another
# will be placed inside each playlist directory.
# It also converts .opus and .ogg files to .m4a for Android playback.
# Note:
# This script requires the following utilities to be on the path:
# mid3v2 (aur package: python-mutagen)
# tageditor (aur package: tageditor)
# metaflac (aur package: flac)
set -e
MUSIC_DIR="$HOME/music"
# REQUIRED_TOOLS=("mid3v2" "tageditor")
REQUIRED_TOOLS=("mid3v2" "metaflac" "tageditor")
# ---------------------------- Functions ----------------------------
usage () {
printf "\nUsage: mkplaylist <playlist_name>\n\n"
printf "mkplaylist - creates an m3u playlist in the $MUSIC_DIR directory\n"
printf "based the music and video files in directory which m3uplaylist is called.\n\n"
printf " - this script should be run in the directory containing the music or video files\n"
printf " - <playlist_name> is mandatory and shouldn't end with '.m3u' extension\n"
printf " - change the destination ($MUSIC_DIR) by editing this script\n\n"
}
tag_music_file() {
while IFS= read -r file; do
filename=$(basename "$file")
extension="${filename##*.}"
artist=$(basename "$file" | cut -d '-' -f 1)
title=$(basename "$file" | cut -d '-' -f 2- | cut -d '.' -f 1)
outputfile="$(dirname "$file")/$title.flac"
# If file is not already flac, convert it
if [ "$extension" != "flac" ]; then
# Delete all tags using mid3v2
mid3v2 --delete-all "$file"
ffmpeg -i "$file" -vn -c:a flac "$outputfile"
file="$outputfile" # Now we're working with the new FLAC file
fi
# Set artist and song title tags using metaflac
metaflac --set-tag="ARTIST=$artist" --set-tag="TITLE=$title" "$file"
done
}
# tag_music_file() {
# while IFS= read -r file; do
# filename=$(basename "$file")
# extension="${filename##*.}"
# artist=$(basename "$file" | cut -d '-' -f 1)
# title=$(basename "$file" | cut -d '-' -f 2- | cut -d '.' -f 1)
# outputfile="$(dirname "$file")/$title.flac"
# # Delete all tags using mid3v2
# mid3v2 --delete-all "$file"
# # If file is not already flac, convert it
# if [ "$extension" != "flac" ]; then
# ffmpeg -i "$file" -vn -c:a flac "$outputfile"
# file="$outputfile" # Now we're working with the new FLAC file
# fi
# # Set artist and song title tags using metaflac
# metaflac --set-tag="ARTIST=$artist" --set-tag="TITLE=$title" "$file"
# done
# }
# tag_music_file() {
# while IFS= read -r file; do
# # Extract artist and song title from filename
# artist=$(basename "$file" | cut -d '-' -f 1)
# title=$(basename "$file" | cut -d '-' -f 2- | cut -d '.' -f 1)
# outputfile="$(dirname "$file")/$title.flac"
# # Delete all tags using mid3v2
# mid3v2 --delete-all "$file"
# # Convert to flac and save to new file
# ffmpeg -i "$file" -vn -c:a flac "$outputfile"
# # Set artist and song title tags using metaflac
# metaflac --set-tag="ARTIST=$artist" --set-tag="TITLE=$title" "$outputfile"
# done
# }
# tag_music_file() {
# while IFS= read -r file; do
# # Extract artist and song title from filename
# artist=$(basename "$file" | cut -d '-' -f 1)
# title=$(basename "$file" | cut -d '-' -f 2 | cut -d '.' -f 1)
# outputfile="$(dirname "$file")/$title.flac"
# # Delete all tags using mid3v2
# mid3v2 --delete-all "$file"
# # Set artist and song title tags using mid3v2
# mid3v2 --artist="$artist" --song="$title" "$file"
# # Convert to flac and save to new file
# ffmpeg -i "$file" -vn -c:a flac "$outputfile"
# done
# }
# tag_music_file() {
# while IFS= read -r file; do
# # Extract artist and song title from filename
# artist=$(basename "$file" | cut -d '-' -f 1)
# title=$(basename "$file" | cut -d '-' -f 2 | cut -d '.' -f 1)
# # Delete all tags using mid3v2
# mid3v2 --delete-all "$file"
# # Set artist and song title tags using mid3v2
# mid3v2 --artist="$artist" --song="$title" "$file"
# done
# }
generate_music_m3u() {
printf "retagging music files....\n"
find "$(pwd)" -print | file -if - | grep -E '(audio)' | awk -F: '{print $1}' | tag_music_file
printf "generating playlist.'%s'...\n" "$LOCAL_PLAYLIST"
find "$(pwd)" -print | file -if - | grep -E '(video|audio)' |
awk -F: '{print $1}' | while read -r line; do basename "$line"; done > "$LOCAL_PLAYLIST"
printf "generating playlist '%s'....\n" "$MUSIC_PLAYLIST"
find "$(pwd)" -print | file -if - | grep -E '(video|audio)' | awk -F: '{print $1}' > "$MUSIC_PLAYLIST"
printf "Done.\n\n"
}
# ----------------------------- Script ----------------------------
# display usage if user specifically requests it
TYPE=$(tr '[a-z]' '[A-Z]' <<< "$@");
[ "$TYPE" = "HELP" ] && usage && exit 1
[ "$TYPE" = "-H" ] && usage&& exit 1
# check that all necessary tools are installed
for tool in ${REQUIRED_TOOLS[@]}; do
if ! type "$tool" >/dev/null 2>&1; then
printf "ERROR: The script requires '%s' but it is not installed or not in PATH.\n" "$tool"
exit 1
fi
done
# use directory name for playlist name when parameter doesn't exist
if [ $# -eq 0 ]
then
set -- "$(basename "$PWD")"
echo "no playlist name entered, so using directory name: '$(basename "$PWD")'"
fi
# ask to overwrite if the playlist already exists
MUSIC_PLAYLIST="$MUSIC_DIR/$@.m3u"
LOCAL_PLAYLIST="./$@.m3u"
if [ -f "$MUSIC_PLAYLIST" ]; then
read -p "$MUSIC_PLAYLIST exists. Overwrite (y/n) " yn
if [ "$yn" != "y" ] && [ "$yn" != "Y" ]; then
exit 0
fi
fi
generate_music_m3u
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