djcev.com

#!/bin/sh
#
#  Copyright (c) 2015-2022, Cameron Vanderzanden. Available under the
#  terms of the 2-clause BSD license. Please see the file "LICENSE" in
#  the root dir of this repository for more information.
#
#- flac_to_mp3.sh 2015/09/01 cev
#- flac_to_mp3.sh 2021/07/23 cev
## Usage: flac_to_mp3.sh [-hV] [-c file] [-d directory] [-o file] <input file>
## 
##     Convert a flac file to an mp3 file, preserving tags.
## 
##       -c     Cover image
##       -d     Output base directory
##       -h     Show help
##       -o     Output file name
##       -r     Apply replaygain to output file
##       -V     Print version info
# This hasn't been touched in a while and may or may not work. Haven't
# needed it since I stopped transcoding to mp3 in scs4tool.sh.

[ -x $HOME/.local/bin/cev_print.sh ] && . $HOME/.local/bin/cev_print.sh

self="${0##*'/'}"
cwd=""

coverfile=""
outdir=""
flacfile=""
mp3file=""
rgain=""
wavfile=""
ttags=""
tpic=""

cleanup() {
    if [ "$ttags" -a -r "$ttags" ]; then rm "$ttags"; fi
    if [ "$tpic" -a -r "$tpic" ]; then rm "$tpic"; fi
    if [ "${tpic}.jpg" -a -r "${tpic}.jpg" ]; then rm "${tpic}.jpg"; fi
    if [ "$wavfile" -a -r "$wavfile" ]; then rm "$wavfile"; fi
}

die_filenotfound() {
    print_filenotfound "$*"
    exit 1
}

die_nofile() {
    print_nofile
    exit 1
}

cleartags() {
    A=""; TPE2=""; a=""; TBPM=""; c=""; y=""; g=""; TKEY=""; t=""; tt=""; T=""
    rgag=""; rgap=""; rgtg=""; rgtp=""
    export A TPE2 a TBPM c y g TKEY t tt T rgag rgap rgtg rgtp
}

readcover() {
    pic="$(metaflac --list --block-type=PICTURE "$flacfile")"
    if [ -n "$pic" ]; then
        tpic=$(mktemp ${TMPDIR:-/tmp}/${self}.pic.XXXXXXXX)
        metaflac --export-picture-to="$tpic.jpg" "$flacfile"
        coverfile="$tpic.jpg"
    fi
}

readtags() {
    metaflac --no-utf8-convert --export-tags-to="$ttags" "$flacfile"
    while read i; do
        k=$(printf "%s" "$i" | cut -d '=' -f 1)
        # convert ':' into '_' because ':' will mess up mp3 comments.
        # shows up most often in URLs; example: 'visit http://'... comments
        v=$(printf "%s" "$i" | cut -d '=' -f 2- | tr ':' '_')
        case $k in
            album|ALBUM) A="$v" ;;
            albumartist|ALBUMARTIST) TPE2="$v" ;;
            artist|ARTIST) a="$v" ;;
            comment|COMMENT) c="$v" ;;
            bpm|BPM) TBPM="$v" ;;
            date|DATE) y="$v" ;;
            genre|GENRE) g="$v" ;;
            initialkey|INITIALKEY) TKEY="$v" ;;
            title|TITLE) t="$v" ;;
            tracktotal|TRACKTOTAL) tt="$v" ;;
            tracknumber|TRACKNUMBER) T="$v" ;;
            replaygain_album_gain|REPLAYGAIN_ALBUM_GAIN) rgag="$v" ;;
            replaygain_album_peak|REPLAYGAIN_ALBUM_PEAK) rgap="$v" ;;
            replaygain_track_gain|REPLAYGAIN_TRACK_GAIN) rgtg="$v" ;;
            replaygain_track_peak|REPLAYGAIN_TRACK_PEAK) rgtp="$v" ;;
        esac
    done < $ttags
}

writecover() {
    if [ -f "$coverfile" ]; then
        eyeD3 --add-image="$coverfile:FRONT_COVER:" "$mp3file" 1>/dev/null 2>&1
    fi
}

writetags() {
    file="$mp3file"
    [ "$A" ] && mid3v2 -A "$A" "$file"
    [ "$TPE2" ] && mid3v2 --TPE2 "$TPE2" "$file"
    [ "$a" ] && mid3v2 -a "$a" "$file"
    [ "$TBPM" ] && mid3v2 --TBPM "$TBPM" "$file"
    [ "$c" ] && mid3v2 -c "$c" "$file"
    [ "$y" ] && mid3v2 -y "$y" "$file"
    [ "$g" ] && mid3v2 -g "$g" "$file"
    [ "$TKEY" ] && mid3v2 --TKEY "$TKEY" "$file"
    [ "$t" ] && mid3v2 -t "$t" "$file"
    if [ "$T" ]; then
        if [ "$tt" ]; then mid3v2 -T "$T/$tt" "$file"
        else mid3v2 -T "$T" "$file"
        fi
    fi
    [ "$rgag" ] && mid3v2 --TXXX "replaygain_album_gain:$rgag" "$file"
    [ "$rgap" ] && mid3v2 --TXXX "replaygain_album_peak:$rgap" "$file"
    [ "$rgtg" ] && mid3v2 --TXXX "replaygain_track_gain:$rgtg" "$file"
    [ "$rgtp" ] && mid3v2 --TXXX "replaygain_track_peak:$rgtp" "$file"
}

flac_decode() {
    if [ "$rgain" = "Y" ]; then
        flac --totally-silent \
            --apply-replaygain-which-is-not-lossless=0t \
            -o "$wavfile" -d "$flacfile"
    else
        flac --totally-silent -o "$wavfile" -d "$flacfile"
    fi
}

mp3_encode() {
    lame --preset insane --add-id3v2 -S "$wavfile" "$mp3file" 1>/dev/null 2>&1
}

while getopts "c:d:ho:rV?" option; do
    case $option in
        c) coverfile="$OPTARG" ;;
        d) outdir="$OPTARG" ;;
        h) print_help && exit ;;
        o) mp3file="$OPTARG" ;;
        r) rgain="Y" ;;
        V) print_version && exit ;;
        "?") print_help && exit ;;
    esac
    shift $((OPTIND - 1))
done

[ $# -lt 1 ] && die_nofile
[ ! -f "$@" ] && die_filenotfound "$*"

trap cleanup EXIT
ttags=$(mktemp ${TMPDIR:-/tmp}/${self}.tags.XXXXXXXX)

[ ! "$outdir" ] && outdir="./"
base=$(basename "$@" flac)
flacfile="$@"
[ ! "$mp3file" ] && mp3file="${base}mp3"
wavfile="${TMPDIR:-/tmp}/${base}wav"

print_self
printf "%breading cover from %b%.45s%b\n" \
    "$_norm" "$_high" "$flacfile" "$_clear"
[ ! "$coverfile" ] && readcover

print_self
printf "%breading tags from %b%.46s%b\n" "$_norm" "$_high" "$flacfile" "$_clear"
readtags

print_self
printf "%bdecoding %b%.55s%b\n" "$_norm" "$_high" "$flacfile" "$_clear"
flac_decode

print_self
printf "%bencoding %b%.55s%b\n" "$_norm" "$_high" "$mp3file" "$_clear"
mp3_encode

print_self
printf "%bwriting cover to %b%.47s%b\n" "$_norm" "$_high" "$mp3file" "$_clear"
writecover

print_self
printf "%bwriting tags to %b%.48s%b\n" "$_norm" "$_high" "$mp3file" "$_clear"
writetags

print_self
printf "%bfinished converting %b%.44s%b\n" \
    "$_norm" "$_high" "$flacfile" "$_clear"