A script to turn large text documents into audiobooks with chapters.

audiobookr.sh

#! /usr/bin/env zsh

# Given a text file, split it into chapters, then make audio for each
# chapter using a set of presets. Then join the audio together
# preserving each chapter in the metadata.

# This assumes mp4.sh is in /usr/local/bin
# https://gist.github.com/djotto/fca0b0e57c8d008575eb7f3648260910

SOURCE_DIR="$(pwd)"
WORK_DIR="$(mktemp -d)"

MP4_SH="$(which mp4.sh)"
INPUT="${1:-/dev/stdin}"
OUTPUT="book.mp4"
SAY_ARGS=(-v Daniel)
CHAPTER_SPLIT="ˇ"

TEXT_CHAPTER_PREFIX="Chapter_"

log() {
    echo "[$(date)] $@"
}

cleanup() {
    log "Cleaning up..."
    rm -r $WORK_DIR;
}

main() {
    log "Using workspace: $WORK_DIR..."
    cd $WORK_DIR;

    cat $SOURCE_DIR/$INPUT | sed "s/\($CHAPTER_SPLIT\)/\n\1\n/g" > fulltext.txt

    log "Splitting chapters..."
    gcsplit --digits 2 --quiet \
        --prefix=$TEXT_CHAPTER_PREFIX fulltext.txt \
        "/$CHAPTER_SPLIT/+1" "{*}"

    log "Sanitizing..."
    for i in $TEXT_CHAPTER_PREFIX*; do
        sed -i '' -e '$ d' $i;
    done

    CHAPTER_COUNT="$(ls $TEXT_CHAPTER_PREFIX* |wc -l)"
    log "Found $CHAPTER_COUNT chapters."

    ls $TEXT_CHAPTER_PREFIX* | while read CHAPTER; do
        N=$(basename $CHAPTER)
        NAME=${N%.*}
        SAYFILE="${NAME}.aiff"

        log "Generating $NAME...";
        say $SAY_ARGS -o $SAYFILE -f $CHAPTER;
    done;

    log "Converting..."
    for i in *.aiff; do ffmpeg -i "$i" "${i%.*}.mp4"; done

    log "Merging..."
    $MP4_SH merge_as_chapter $TEXT_CHAPTER_PREFIX*.mp4 combined.mp4

    mv combined.mp4 $SOURCE_DIR/$OUTPUT
}

#trap  SIGINT
main
cleanup
log "Done."