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$ time oggdec -o /dev/null gleba-1-hero.ogg
oggdec from vorbis-tools 1.4.2
Decoding "gleba-1-hero.ogg" to "/dev/null"
        [100.0%]

real    0m1.834s
user    0m0.969s
sys     0m0.422s

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$ time opusdec gleba-1-hero.opus /dev/null
Decoding to 44100 Hz (2 channels)
Encoded with libopus 1.4-711-g178672ed
ENCODER=opusenc from opus-tools 0.1.10
ENCODER_OPTIONS=--bitrate 64
Decoding complete.

real    0m1.617s
user    0m1.531s
sys     0m0.047s

Code: Select all

#!/usr/bin/env bash

# Description: counts file sizes in the given folder to estimate the wasted space
# due to sector alignment overhead ("disk size" in Windows' terms).
#
# Example: with a sector size of 4096, but actual file data of 2000 bytes, 2096 allocated bytes on disk remain unused.
# In extreme cases, it would help to pack all files in a container format (say, .ZIP without compression or .tar)
# to avoid per-file overhead.

# USAGE:
# ./script.sh <target folder>


# EXAMPLE: 
# ./script "$HOME/.steam/steam/steamapps/common/Factorio/data/space-age/sound/"

# OPTIONS:
# Edit sector_size and max_size_deviation_percent if you want.

set -e
shopt -s nocasematch

target_dir="$1"

# Default is 4096 for Windows/NTFS, Linux filesystems
sector_size=4096
# If less than % of a sector is occupied, count this file for overhead calculation.
max_size_deviation_percent=50

size_bitmask=$(( $sector_size - 1 ))
divisor=$(( (100 / $max_size_deviation_percent ) ))

limit=$(( $sector_size / $divisor ))

printf "Disk sector size for calculations (must be a power of 2): %d\n" "${sector_size}"
printf "Count, if file size within '%d' bytes of sector size\n" "$limit"

total_files_matched=0
total_size_deviation_matched=0

test $divisor -eq 0 && exit 2;
test -d "$target_dir"
while read -d $'\0' line
do
    file_name="$(echo "$line" | cut -f2)"

    if [[ "$file_name" =~ \.(ogg|flac|opus|mp3)$ ]]; then
        byte_size="$(echo "$line" | cut -f1)"

        remainder=$(( $byte_size & $size_bitmask / $divisor ))

        echo "$remainder <= $limit; $byte_size bytes - $file_name"

        if [[ $remainder -le $limit ]] && [[ ! $remainder -eq 0 ]]; then

            total_files_matched=$(( total_files_matched + 1 ))
            total_size_deviation_matched=$(( total_size_deviation_matched + remainder ))

            #echo "counting... $total_files_matched ; $total_size_deviation_matched"
        fi
    else
        echo "File is not music: $file_name"
    fi

done < <(du --all --bytes -0 "$target_dir")

# need to count the sector space, once per file, that was not occupied by any data (the remaining free space in a sector)
total_overhead=$(( total_files_matched * sector_size - total_size_deviation_matched ))
printf "Total files matched: %d\n" "$total_files_matched"
printf "Their sector misaligned overhead amounts to: %d bytes.\n" "$total_overhead"