gog_dex_extract_music.sh

#!/bin/bash

# Usage: gog_dex_extract_music.sh <data_dir>
#
# The script relies on these utilities:
# 1. QuickBMS extractor (quickbms)
#    See http://aluigi.altervista.org/quickbms.htm
#    Source: http://aluigi.altervista.org/papers/quickbms_src.zip
#
# 2. Unity BMS script to be used with QuickBMS (unity.bms)
#    Source: http://aluigi.altervista.org/bms/unity.bms
#
# 3. FSB Vorbis extractor (extractor)
#    Source: https://github.com/tmiasko/fsb-vorbis-extractor
#
# The script assumes, all these tools are placed in ${HOME}/bin/extractors
# override these three variables when running the script if you placed them elsewhere or they are named differently.
#   quickbms=<location> unity_bms=<location> vorbis_extractor=<location> gog_dex_extract_music.sh <data_dir>

quickbms=${quickbms:-"${HOME}/bin/extractors/quickbms"}
unity_bms=${unity_bms:-"${HOME}/bin/extractors/unity.bms"}
vorbis_extractor=${vorbis_extractor:-"${HOME}/bin/extractors/extractor"}

dex_data="$1"

extract_dir="tmp_extract_fsb"
result_dir="result_ogg"

# cleanup
if [ -e "$extract_dir" ]; then
   rm -v ${extract_dir}/*.fsb
fi

if [ -e "$result_dir" ]; then
   rm -v ${result_dir}/*.ogg
fi

mkdir -p $extract_dir
mkdir -p $result_dir

# passing "r" as an answer to rename potential duplicates instead of skipping them
printf "r\n" | ${quickbms} -F 'level*;main*;*.assets;*.resource' -f '*.fsb' "$unity_bms" "$dex_data" "$extract_dir"

sources_tmp=( $extract_dir/resources~[[:lower:]]*.fsb $extract_dir/resources~GSV_[[:lower:]]*.fsb )

# Excluding some matches which aren't actually music
music_sources=()

for source in ${sources_tmp[@]}; do
   if [[ "$source" != "$extract_dir/resources~click.fsb" ]] && \
      [[ "$source" != "$extract_dir/resources~hover.fsb" ]] && \
      [[ "$source" != "$extract_dir/resources~hello"*".fsb" ]]; then
      music_sources+=( $source )
   fi
done

# Extracting ogg/vorbis from fsb (fmod archives)
for source in ${music_sources[@]}; do
   target=${source##"$extract_dir/"}
   target=${target%%.*}.ogg
   target=${target##resources~}
   $vorbis_extractor $source -d $result_dir
   mv -v ${result_dir}/1.sample.ogg ${result_dir}/${target}
done