bash script for CD/DVD music ripping

rip.sh

#!/usr/bin/env bash

# first, we need to determine type of disk
# this can be achieved by trying first mount_cd9660 and checking error
# if it returns "Device not configured" - we need to wait,
# otherwise its not CD9660 fs and we can move to next
#
# try mounting UDF, if it returns "Invalid argument" - it's not an UDF
# 
# the last remaining disc type is CD audio disc, that we must
# rip with cdparanoia -B -d /dev/cd0 and then ffmpeg all tracks into mp3

# DISC RIPPING LOGIC

rips_user="mykola"
rips_group="mykola"
rips_perms="600"
rips_dir_perms="700"

rips_dir="$(pwd)"

rip_begin() {
  echo "Enter rip name: "
  read -r name

  echo "Enter rip full-name: "
  read -r full_name
  echo -e "$name\t$full_name" >> rips.txt
  # create rip directory and cd into it, so we can have workplace
  mkdir "$name"
  cd "$name"
}

rip_end() {
  # own files
  chown -R "$rips_user:$rips_group" .
  chmod $rips_perms *
  chmod $rips_dir_perms .
  # leave title dir
  # NOTE: fs is already mounted by mount_cd9660 and mount_udf probing
  cd "$rips_dir"
  # eject disc
  cdcontrol eject
}

rip_fs() {
  rip_begin

  # just copy all files
  cp -rf /mnt/cdrom/* ./
  # only for filesystem discs: unmount
  umount /mnt/cdrom

  rip_end
}

rip_audio() {
  rip_begin

  # directly ripping using cdparanoia is too slow,
  # so we're gonna parse CD's table of contents and 
  # dd each track one by one
  sectorsize=$(geom disk list /dev/cd0 | awk '$1 == "Sectorsize:" { print $2 }')
  
  while read -r track_id track_len track_start track_ch; do
    dd if=/dev/cd0 bs=$sectorsize skip=$track_start count=$track_len | ffmpeg -f s16le -ar 44100 -ac $track_ch -i pipe: -b:a 320k "track$track_id.mp3"
  done < <(cdparanoia -Q -d /dev/cd0 2>&1 | awk '$1 ~ /[0-9]/ { sub(/.$/,"",$1); print $1, $2, $4, $8 }') 

  rip_end
}

# DETECT DISC TYPE
# try mounting CD9660
stderr=$(mount_cd9660 /dev/cd0 /mnt/cdrom 2>&1 >/dev/null)
ret=$?

echo $stderr

if [ $ret -ne 0 ]; then
  # we got an error, let's taste stderr message
  if [[ $stderr == *"Device not configured"* ]]; then
    # gonna wait for disc to be configured in a loop
    while [[ $stderr == *"Device not configured"* ]]; do
      stderr=$(mount_cd9660 /dev/cd0 /mnt/cdrom 2>&1 >/dev/null)
      ret=$?
    done
  fi
fi

if [ $ret -eq 0 ]; then
  echo "we got cd9660 mounted!"
  
  rip_fs
else
  # let's try UDF
  stderr=$(mount_udf /dev/cd0 /mnt/cdrom 2>&1 >/dev/null)
  ret=$?
  if [[ $ret -eq 0 ]]; then
    # it's UDF!
    echo "we got UDF mounted!"

    rip_fs
  else
    # final try - CD audio disc
    stderr=$(cdparanoia -Q -d /dev/cd0 2>&1 >/dev/null)
    if [[ $stderr == *"Unable to read table of contents header"* ]]; then
      # not even an audio cd disc
      echo "unknwon disc type and fs" >&2
      exit 1
    else
      # thats an audio disc!
      echo "got audio cd"

      rip_audio
    fi
  fi
fi