makemp3

#!/bin/bash
# makemp3
version="1.0"
unset dependencies
dependencies=(ffmpeg normalize)
suffix=""
extension="mp3"
relativepath="access/mp3"

scriptdir=$(dirname "${0}")
. "${scriptdir}/mmfunctions" || { echo "Missing '${scriptdir}/mmfunctions'. Exiting." ; exit 1 ;};

usage(){
    echo
    echo "$(basename "${0}") ${version}"
    echo "This application will create an mp3 file from a video file or package input with the following options. By default the output will be written to ${outputdir}. You can override this with the -o option."
    echo "Dependencies: ${dependencies[@]}"
    echo "Usage: $(basename "${0}") [ -o /directory/to/write/to/ ] fileorpackage1 [ fileorpackage2 ...]"
    echo "  -o directory ( directory to write the resulting file to )"
    echo "  -h ( display this help )"
    echo
    exit
}
[ "${#}" = 0 ] && usage
check_dependencies "${dependencies[@]}"

cleanup(){
    _log -a "Process aborted"
    exit 1
}

trap cleanup SIGHUP SIGINT SIGTERM

OPTIND=1
while getopts ":ho:" opt; do
    case "${opt}" in
        h) usage ;;
        o)             outputdir="${OPTARG}"
            if [ ! -d "${outputdir}" ] ; then
                report -wt "The output directory option, ${outputdir}, does not refer to an actual directory. Quitting."
                exit 1
            fi
            ;;
        *) echo "bad option -${OPTARG}" ; usage ;;
        :) echo "Option -${OPTARG} requires an argument" ; exit 1 ;;
    esac
done
shift $(( ${OPTIND} - 1 ))

while [ "${*}" != "" ] ; do
    input="${1}"
    if [ -z "${outputdir}" ] ; then
        [ -d "${input}" ] && { outputdir="${input}/objects/${relativepath}" && logdir="${input}/metadata/submissionDocumentation/logs" ;};
        [ -f "${input}" ] && { outputdir=$(dirname "${input}")"/${relativepath}" && logdir="$(dirname "${input}")/${relativepath}/logs" ;};
        [ ! "${outputdir}" ] && { outputdir="${input}/objects/${relativepath}" && logdir="${input}/metadata/submissionDocumentation/logs" ;};
    else
        logdir="${outputdir}/logs"
    fi

    _find_input "${input}"

    filename=$(basename "${sourcefile}")
    mediaid=$(basename "${input}" | cut -d. -f1)

    _log -b

    _set_up_output
    
    unset inputoptions
    unset middleoptions
    inputoptions+=(-nostdin)
    middleoptions+=(-map 0:a:0)
    middleoptions+=(-ac 2)
    middleoptions+=(-r:a 44100)
    middleoptions+=(-sample_fmt s16p)
    get_audio_mapping "${sourcefile}"
    middleoptions+=(${audiomapping_ffmpeg[@]})

    if [ "${logdir}" != "" ] ; then
        mkdir -p "${logdir}"
        export FFREPORT="file=${logdir}/%p_%t_$(basename "${0}")_${version}.txt"
        inputoptions+=(-v warning -stats)
    fi
    report -dt "Working on $(basename "${output}")."
    report -dt "Running: ffmpeg ${inputoptions[@]} -i \"${sourcefile}\" ${middleoptions[@]} \"${output}\""
    ffmpeg ${inputoptions[@]} -i "${sourcefile}" ${middleoptions[@]} "${output}"
    report -dt "Adjusting highest audio peak to full scale..."
    normalize --peak -v "${output}"
    echo
    report -dt "$(basename ${output}) is done."
    shift
    _log -e
done