223 lines
7.2 KiB
Bash
Executable file
223 lines
7.2 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -eu
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tmp_directory=/tmp/transcode
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lock_file=/tmp/music-transcode.lock
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function die()
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{
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printf '%s\n' "$1" >&2
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exit "${2-1}"
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}
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function transcode_to_mp3()
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{
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input_directory="$1"
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input_file_name="$2"
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mp3_directory="$3"
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input_path="$input_directory/$input_file_name"
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output_file_name="$(echo "$input_file_name" | sed -E 's/(\.[^. ]+)?$/.mp3/g')"
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output_path="$mp3_directory/$output_file_name"
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output_directory="$(dirname "$output_path")"
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if [ ! -d "$output_directory" ] ; then
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echo "New Directory: \"$output_directory\""
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mkdir -p "$output_directory" || die "Could not create directory \"$output_directory\"."
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fi
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transcode=false
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if [ ! -f "$output_path" ] ; then
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echo "New MP3: \"$output_path\""
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transcode=true
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elif [ "$input_path" -nt "$output_path" ] ; then
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echo "Input file is newer: \"$output_path\""
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transcode=true
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fi
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if [ "$transcode" = true ] ; then
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input_type="$(file -b --mime-type "$input_path")"
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case "$input_type" in
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"audio/flac"|"audio/x-flac")
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tmp_path="$tmp_directory/$(basename "$output_path")"
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echo "Transcoding MP3..."
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ffmpeg -hide_banner -loglevel fatal -i "$input_path" -y -b:a 320k -qscale:a 2 -id3v2_version 3 -f mp3 "$tmp_path" < /dev/null || die "Failed to transcode to \"$tmp_path\"."
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mv -f "$tmp_path" "$output_path" || die "Could not move file to \"$output_path\"."
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;;
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application/octet-stream)
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echo "Warning: Assuming \"$input_path\" is a MP3 file."
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;&
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audio/mpeg)
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echo "Copying MP3..."
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cp -f "$input_path" "$output_path"
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;;
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*)
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echo "Unsupported input type $input_type (\"$input_path\")"
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return 1
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;;
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esac
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fi
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}
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function ogg_add_cover()
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{
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ogg_file="$1"
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cover_file="$2"
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tmp_metafile="$tmp_directory/metadata"
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tmp_mdimg="$tmp_directory/image-with-header"
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cover_mime_type="$(file -b --mime-type "$cover_file")"
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description=""
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vorbiscomment --list --raw "$ogg_file" > "$tmp_metafile" && \
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sed -i -e '/^metadata_block_picture/d' "$tmp_metafile" && \
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echo -n "" > "$tmp_mdimg" && \
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printf "0: %.8x" 3 | xxd -r -g0 >> "$tmp_mdimg" && \
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printf "0: %.8x" "$(echo -n "$cover_mime_type" | wc -c)" | xxd -r -g0 >> "$tmp_mdimg" && \
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echo -n "$cover_mime_type" >> "$tmp_mdimg" && \
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printf "0: %.8x" "$(echo -n "$description" | wc -c)" | xxd -r -g0 >> "$tmp_mdimg" && \
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echo -n "$description" >> "$tmp_mdimg" && \
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printf "0: %.8x" 0 | xxd -r -g0 >> "$tmp_mdimg" && \
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printf "0: %.8x" 0 | xxd -r -g0 >> "$tmp_mdimg" && \
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printf "0: %.8x" 0 | xxd -r -g0 >> "$tmp_mdimg" && \
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printf "0: %.8x" 0 | xxd -r -g0 >> "$tmp_mdimg" && \
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printf "0: %.8x" "$(wc -c "$cover_file" | cut --delimiter=' ' --fields=1)" | xxd -r -g0 >> "$tmp_mdimg" && \
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cat "$tmp_cover" >> "$tmp_mdimg" && \
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echo "metadata_block_picture=$(base64 --wrap=0 < "$tmp_mdimg")" >> "$tmp_metafile" && \
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vorbiscomment --write --raw --commentfile "$tmp_metafile" "$ogg_file" && \
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rm "$tmp_metafile" "$tmp_mdimg"
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}
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function transcode_to_ogg()
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{
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input_directory="$1"
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input_file_name="$2"
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ogg_directory="$3"
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input_path="$input_directory/$input_file_name"
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output_file_name="$(echo "$input_file_name" | sed -E 's/(\.[^. ]+)?$/.ogg/g')"
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output_path="$ogg_directory/$output_file_name"
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directory="$(dirname "$output_path")"
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if [ ! -d "$directory" ] ; then
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echo "New Directory: \"$directory\""
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mkdir -p "$directory" || die "Could not create directory \"$directory\"."
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fi
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transcode=false
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if [ ! -f "$output_path" ] ; then
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echo "New OGG: \"$output_path\""
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transcode=true
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elif [ "$input_path" -nt "$output_path" ] ; then
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echo "Input file is newer: \"$output_path\""
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transcode=true
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fi
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if [ "$transcode" = true ] ; then
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input_type="$(file -b --mime-type "$input_path")"
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tmp_ogg="$tmp_directory/$(basename "$output_path")"
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tmp_cover="$tmp_directory/cover"
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case "$input_type" in
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"audio/flac"|"audio/x-flac")
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echo "Transcoding OGG..."
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ffmpeg -hide_banner -loglevel fatal -i "$input_path" -y -map a -qscale:a 6 -id3v2_version 3 -f ogg "$tmp_ogg" < /dev/null || die "Could not transcode to \"$tmp_ogg\"."
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echo "Adding OGG cover image..."
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metaflac --export-picture-to="$tmp_cover" "$input_path" || die "Could not export cover image."
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ogg_add_cover "$tmp_ogg" "$tmp_cover" || die "Could not add cover image to \"$tmp_ogg\"."
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mv -f "$tmp_ogg" "$output_path" || die "Could not move file to \"$output_path\"."
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;;
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application/octet-stream)
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echo "Warning: Assuming \"$input_path\" is a MP3 file."
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;&
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audio/mpeg)
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echo "Transcoding OGG..."
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ffmpeg -hide_banner -loglevel fatal -i "$input_path" -y -map a -qscale:a 6 -id3v2_version 3 -f ogg "$tmp_ogg" || die "Could not transcode to \"$tmp_ogg\"."
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echo "Adding OGG cover image..."
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exiftool -Picture -b "$input_path" > "$tmp_cover" || die "Could not export cover image."
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ogg_add_cover "$tmp_ogg" "$tmp_cover" || die "Could not add cover image to \"$tmp_ogg\"."
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mv -f "$tmp_ogg" "$output_path" || die "Could not move file to \"$output_path\"."
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;;
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*)
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echo "Unsupported input type $input_type (\"$input_path\")"
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return 1
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;;
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esac
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fi
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}
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if [ -f "$lock_file" ] ; then
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echo "Another instance is already running. Exiting."
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echo "If you are certain this is the only instance, you can delete the lock file $lock_file"
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exit 2
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else
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touch "$lock_file" || die "Could not create lock file."
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fi
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function cleanup()
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{
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rm -f "$lock_file"
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rm -rf "$tmp_directory"
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}
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trap cleanup EXIT SIGTERM
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if [ ! -d "$tmp_directory" ] ; then
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mkdir -p "$tmp_directory" || die "Could not create temporary directory \"$tmp_directory\"."
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fi
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mp3_out=''
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ogg_out=''
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while [ $# -gt 1 ] ; do
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case "$1" in
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'--mp3-out')
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mp3_out="$2"
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shift 2
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;;
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'--ogg-out')
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ogg_out="$2"
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shift 2
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;;
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'--')
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shift
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break
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;;
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*)
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>&2 echo "Unknown argument: $1"
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exit 1
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;;
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esac
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done
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if [ $# -lt 1 ] ; then
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>&2 echo "Missing input directory argument"
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exit 1
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fi
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input_directory="$1"
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while IFS= read -r -d '' file; do
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if [ "$mp3_out" != '' ] ; then
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transcode_to_mp3 "$input_directory" "$file" "$mp3_out" || break
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fi
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if [ "$ogg_out" != '' ] ; then
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transcode_to_ogg "$input_directory" "$file" "$ogg_out" || break
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fi
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done < <(
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find -P "$input_directory" \( -iname '*.flac' -or -iname '*.mp3' \) -printf '%P\0' | sort -z
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)
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echo "Done transcoding."
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