Splits a single audio file and a corresponding .cue file describing the tracks from it (as generated by some CD ripping/recording tools) into MP3 files, cutting the input file in the time point specified in the .cue file. Usage: ./cue-and-audio-to-mp3s input.wav < input.cue

cue-and-audio-to-mp3s

#! /bin/bash
set -e

indexes=( )
titles=( )

read_indexes () {
	local -a line
	local tmp
	local in_file=false
	while read -ra line ; do
		if [[ ${line[0]} = FILE ]] ; then
			in_file=true
			continue
		fi
		${in_file} || continue

		if [[ ${line[0]} = INDEX && ${line[1]} = 01 ]] ; then
			indexes=( "${indexes[@]}" "${line[2]}" )
		elif [[ ${line[0]} = TITLE ]] ; then
			unset 'line[0]'
			tmp=${line[*]}
			titles=( "${titles[@]}" "${tmp:1:-1}" )
		fi
	done
}


strip_lzeros () {
	local v=$1
	while [[ ${v:0:1} = 0 ]] ; do
		v=${v:1}
	done
	if [[ -z ${v} ]] ; then
		v=0
	fi
	echo "${v}"
}


index_to_ts () {
	local mm=$(strip_lzeros "${1:0:2}")
	local ss=$(strip_lzeros "${1:3:2}")
	local ff=$(strip_lzeros "${1:6:2}")
	ff=$(( 100 * ff / 75 ))
	echo "00:${mm}:${ss}.${ff}"
}


index_diff () {
	local mm1=$(strip_lzeros "${1:0:2}")
	local ss1=$(strip_lzeros "${1:3:2}")
	local ff1=$(strip_lzeros "${1:6:2}")
	ss1=$(( ss1 + mm1 * 60 ))
	ff1=$(( ff1 + ss1 * 75 ))

	local mm2=$(strip_lzeros "${2:0:2}")
	local ss2=$(strip_lzeros "${2:3:2}")
	local ff2=$(strip_lzeros "${2:6:2}")
	ss2=$(( ss2 + mm2 * 60 ))
	ff2=$(( ff2 + ss2 * 75 ))

	local ffd=$(( ff2 - ff1 ))
	echo $(( ffd / 75 ))
}

read_indexes
items=${#indexes[@]}

for (( i = 0 ; i < items ; i++ )) ; do
	title=${titles[$i]}
	printf -v ofile "%02i. %s.mp3" "$(( i + 1 ))" "${title:-Unknown title}"
	startpos=${indexes[${i}]}
	endpos=${indexes[$((i+1))]}

	if [ "${endpos}" ] ; then
		endpos=( -t "$(index_diff "${startpos}" "${endpos}")" )
	else
		endpos=( )
	fi
	startpos=( -ss "$(index_to_ts "${startpos}")" )

	echo "${ofile}..."
	ffmpeg -loglevel warning -y -i "$1" -ac 2 -ar 44100 -ab 192k -acodec libmp3lame -vn "${startpos[@]}" "${endpos[@]}" "${ofile}"
	endpos=""
	startpos=""
done