USALUG: - Convert your mp3 audiobooks to m4b(comments/suggestions plz)

Convert your mp3 audiobooks to m4b(comments/suggestions plz)

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Lord.DragonFly.of.Dawn
Advanced Member

Joined: 18 Jul 2024
Posts: 607
Location: South Portland, Maine, USA, Earth, Sol System

Posted: Sat Sep 06, 2024 8:14 pm Post subject: Convert your mp3 audiobooks to m4b(comments/suggestions plz)

It works, but has some very significant parts that i am not at all happy with.

Namely: spaces in filenames and the not insignificant (10-30GB) free space requirement.

If anyone has any ideas as to how to fix these i'd love to know.

Code:

#!/bin/bash

# Filename:makem4b.sh
# Author:Lord.DragonFly.of.Dawn
# Date: 2024.09.06

# Define a few basic directories
# If this guy exists process files inside into one giant m4b
BUILD=".build";
# Backup files into this directory when done
BACKUP=".source";
# Temporary stuffgors here
TEMP=".tmp";

# Define a few temorary files relative to the temp dir
T_WAV="${TEMP}/temp.wav";
T_M4A="${TEMP}/temp.m4a";

# Define the normalize flag. If present try to normalize audio
F_NORMALIZE=".normalize";

# Detect the presence of certain required apps.
# fail now if they aren't present

# Detect mplayer:
if ! which mplayer > /dev/null 2>&1; then
echo "FATAL ERROR: mplayer binary not detected.";
echo " mplayer 1.0 or higher required for decoding";
exit 1;
else
P_MPLAYER="$(which mplayer)";
fi

# Detect faac:
if ! which faac > /dev/null 2>&1; then
echo "FATAL ERROR: faac binary not detected.";
echo "faac 1.26 or higher required for encoding.";
else
P_FAAC="$(which faac) -b 48";
fi

# Detect awk:
if ! which awk > /dev/null 2>&1; then
echo "FATAL ERROR: awk binary not detected.":
echo " awk 3.0 or higher required for processing.";
else
P_AWK="$(which awk)";
fi

# Detect normalize:
if ! which normalize > /dev/null 2>&1; then
echo "ERROR: normalize binary not detected.";
echo " Ignoring any normalize flags";
D_NORMALIZE="";
else
D_NORMALIZE="true"
P_NORMALIZE="$(which normalize)";
fi

# Detect rename
if ! which rename > /dev/null 2>&1; then
echo "FATAL ERROR: rename binary not detected. ";
echo " util-linux-ng 2.13 or higher required!";
exit 1;
else
P_RENAME="$(which rename)";
fi

# Detect tree
if ! which tree > /dev/null 2>&1; then
echo "FATAL ERROR: tree binary not detected. ";
echo " tree 1.5 or higher required!";
exit 1;
else
P_TREE="$(which tree)";
fi

# Detect grep
if ! which egrep > /dev/null 2>&1; then
echo "FATAL ERROR: egrep binary not detected. ";
echo " grep 2.2 or higher required!";
exit 1;
else
P_EGREP="$(which egrep)";
fi

# BEGIN MAIN LOOP!
for AUTHOR_DIR in $(ls -v); do
# Only process ${AUTHOR_DIR} if it really is a dir
if [ -d "${AUTHOR_DIR}" ]; then
# Extract author name for flags
AUTHOR="$(echo ${AUTHOR_DIR}| tr _ ' ')";

# Output progress info
echo "Now Processing ${AUTHOR}";
cd "${AUTHOR_DIR}"
# BEGIN SECONDARY LOOP
for TITLE_DIR in $(ls -v); do
   # Only process if build/rebuild is required
   if [ -d "${TITLE_DIR}/${BUILD}" ]; then
   cd "${TITLE_DIR}";
   # Extract more meta info
   ORDER="$(echo ${TITLE_DIR}|awk -F _-_ '{ print $2 }'|tr _ ' ')";
   BOOK="$(echo ${TITLE_DIR}|awk -F _-_ '{ print $1 }'|tr _ ' ')";
   TITLE="$(echo ${TITLE_DIR}|awk -F _-_ '{ print $3 }'|tr _ ' ')";
   if [ -z "${TITLE}" ]; then
      TITLE="${BOOK}";
      TARGET="$(echo ${ORDER} - ${TITLE}.m4b|tr ' ' _)";
   else
      TARGET="$(echo ${ORDER} - ${BOOK} - ${TITLE}.m4b|tr ' ' _)";
   fi;
   # Output more progress info
   echo " Now Processing ${BOOK} (${ORDER})";

   # Rename files to remove spaces
   # TODO - make the rest of the script handle spaces
   # gracefully so this rename is not needed.
   cd ${BUILD};
   ls | while read i; do
   mv "${i}" "$(echo ${i}|tr ' ' _)" 2> /dev/null;
   done;
cd ..;

   # Give us us tempdir!
   mkdir -p ${TEMP};

   # Normalize routine. (not tested yet)
   # TODO - test this subroutine
   if [ ${D_NORMALIZE} -a -e ${F_NORMALIZE} ]; then
      echo " Normalizing input";
      ${P_NORMALIZE} ${BUILD} >/dev/null 2>&1;
      rm ${F_NORMALIZE}
   fi;

   # remove leftovers from previous run(s)
   if [ -e ${T_WAV} ]; then
      rm ${T_WAV};
   fi

   # Collect filenames
   T_FILES="$(${P_TREE} -if ${BUILD}| ${P_EGREP} 'mp3$')";

   # Counters
   T_FILES_TOTAL="$(${P_TREE} -if ${BUILD}| ${P_EGREP} 'mp3$' | wc -l)";
   T_FILES_NUM="0";

   # Begin decoding files.
   # WARNING! This takes up between 10 and 20 Gig of HD space!
   # URGENT - fix this to use a named pipe to reduce the disk
   # activity and remove the free-space requirement
   echo " Decoding now..."
   for FILE in $T_FILES; do
      # Progress bar
      echo -ne "\r ${T_FILES_NUM} of ${T_FILES_TOTAL} Completed";
      T_FILE="${TEMP}/${T_FILES_NUM}.wav";
      $P_MPLAYER -ao pcm:fast:file=${T_FILE} -vo null -vc null ${FILE} > /dev/null 2>&1 ;
      cat ${T_FILE} >> ${T_WAV};
      rm ${T_FILE};
      T_FILES_NUM=$(expr ${T_FILES_NUM} + 1);
   done;
   echo -e "\r ${T_FILES_NUM} of ${T_FILES_TOTAL} Completed";

   # Encode files
   # TODO - Add support for embedding cover art
   echo " Encoding now... (You might want to get some tea)";
   ${P_FAAC} --artist "${ARTIST}" \
      --writer "${ARTIST}" \
      --title "${TITLE}" \
      --genre Audiobook \
      --album "${BOOK}" \
      --track 1 \
      --disc "${ORDER}" \
      $COVER \
      -o "${T_M4A}" ${T_WAV};
   mv "${T_M4A}" "${TARGET}";

   # Do cleanup.
   mv ${BUILD} ${BACKUP};
   rm -r ${TEMP};
   cd ..;
   fi;
done;
cd ..;
fi;
done;

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