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.
#
#- cd_audio.sh 2015/02/17 cev
#- cd_audio.sh 2021/07/23 cev
#- cd_audio.sh 2022/01/29 cev
## Usage: cd_audio.sh [-3fhV] [-o outdir] <directory>
##
##     Convert mp3 or flac files in <directory> to wav files in an
##     autogenerated dir (or outdir). Then print a suitable command
##     for writing the wav files to a redbook audio CD.
##  
##       -3     Convert mp3 files
##       -f     Convert flac files
##       -h     Show help
##       -o     Write wav files to outdir instead of creating a dir in /tmp
##       -V     Print version info
#  Todo: switch from specifying filetype to detecting filetype? Would allow
#  generation of audio CDs from mixed format sources.

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

self="${0##*'/'}"
mode="mp3"
cd_command=${cd_command:-"cdrecord"}
cd_opts=${cd_opts:-"-v -dao -pad -audio speed=1 dev=5,0,0"}

die_directorynotfound() {
    print_directorynotfound "$@"
    exit 1
}

while getopts "3fho:V?" option; do
    case $option in
        3) mode="mp3" ;;
        f) mode="flac" ;;
        h) print_help && exit ;;
        o) tdir="$OPTARG" ;;
        V) print_version && exit ;;
        "?") print_help && exit ;;
    esac
    shift $((OPTIND - 1))
done

if [ -n "$tdir" ]; then
    if [ ! -d "$tdir" ]; then
        print_self error
        printf "%boutput dir %b%s %bdoes not exist or is not a directory!%b\n" \
            "$_norm" "$_error" "$tdir" "$_norm" "$_clear" >&2
    fi
else
    tdir=$(mktemp -d ${TMPDIR:-/tmp}/${self}.XXXXXXXX)
fi

[ ! -d "$@" ] && die_directorynotfound "$@"

if [ $mode = "flac" ]; then
    extension="flac"
    command="flac -d -o"
    command_expr="\${outfile}"
elif [ $mode = "mp3" ]; then
    extension="mp3"
    command="mpv --msg-level=all=warn --no-audio-display --no-video"
    command="$command --audio-samplerate=44100 --ao=pcm"
    command_expr="--ao-pcm-file=\${outfile}"
fi

for f in "$@"/*."$extension"; do
    file="$(basename "$f")"
    outfile="$tdir/${file}.wav"
    print_self
    printf "%bprocessing '%b%s%b'...%b\n" \
        "$_norm" "$_high" "$file" "$_norm" "$_clear"
    eval e="\$$command_expr"
    $command "$e" "$f"
    unset e
done

# echo the command; don't run it. let the user copy/paste it when ready.
print_self
printf "%bwaves written. copy & paste the next line to burn.%b\n" \
    "$_norm" "$_clear"
printf "%s %s %s && rm %s && rmdir %s\n" \
    "$cd_command" "$cd_opts" "$tdir/*.wav" "$tdir/*.wav" "$tdir"