mp3fixer

An embarrassing script that works pretty well for making mp3 filename and id3v1/v2 info all consistent.

Requires the id3v2 command line tool.

#!/bin/bash

TEMPFILE=/tmp/mp3fixer.out.$$

EditTags()
{
    read -e -p "Please enter artist ($1): " artist
    [ x"$artist" = x ] && artist=$1
    id3v2 -a "$artist" "$file"
    read -e -p "Please enter title ($2): " title
    [ x"$title" = x ] && title=$2
    id3v2 -t "$title" "$file"
    v1title=$title
    v2title=$title
    v1artist=$artist
    v2artist=$artist
}

CheckFileName()
{
  OldFileName=""
  NewFileName="$artist - $title.mp3"
  if [ x"$file" != x"$NewFileName" ]
  then
    echo "  I think the filename should be changed (x to skip, i to edit tags)"
    read -e -p "  Please enter new filename ($NewFileName): " OldFileName
    if [ x"$OldFileName" = xi ]
    then
      EditTags "$artist" "$title"
      return 1
    fi
    if [ x"$OldFileName" = x ]
    then
      OldFileName="$NewFileName"
    fi
    if [ x"$OldFileName" != xx ]
    then
      mv "$file" "$OldFileName"
    fi
  fi
  return 0
}

for file in *.mp3
do
  echo "examining $file"
  id3v2 -l "$file" >$TEMPFILE

  artist=""
  title=""

  # Come up with possible artist/songname, based on filename.
  fNameArtist=`echo "$file" | awk -F" -" '{ print $1 }'`
  fNameTitle=`echo "$file" | awk -F"- " '{ print $NF }' | \
     awk -F".mp3" '{ print $1 }'`

  # Collect the v1 artist and songname
  v1artist=`grep "Artist: " $TEMPFILE | awk -F"Artist: " '{ print $NF }' | sed 's/^[ \t]*//;s/[ \t]*$//'`
  v1title=`grep "Title *:.*" $TEMPFILE | sed 's/ *Artist.*//' | awk -F": " '{ print $NF }' | sed 's/^[ \t]*//;s/[ \t]*$//'`

  # Now collect the v2 artist and songname.  Check for some
  # alternate v2.2 tags too.
  v2artist=`grep TPE1 $TEMPFILE | awk -F": " '{print $NF }'`
  [ x"$v2artist" == x ] && \
    v2artist=`grep TP1 $TEMPFILE | awk -F": " '{print $NF }'`
  v2title=`grep TIT2 $TEMPFILE | awk -F": " '{print $NF }'`
  [ x"$v2title" == x ] && \
    v2title=`grep TT2 $TEMPFILE | awk -F": " '{print $NF }'`

#echo "fNameArtist: $fNameArtist xxx"
#echo "fNameTitle: $fNameTitle xxx"
#echo "v1artist: $v1artist xxx"
#echo "v2artist: $v2artist xxx"
#echo "v1title: $v1title xxx"
#echo "v2title: $v2title xxx"

  # If file has no tags, create them based on filename
  if grep -q "No ID3 tag" $TEMPFILE
  then
    echo "no tags on file, creating v1 and v2 tags"
    EditTags "$fNameArtist" "$fNameTitle"
  fi

  # If file has bogus v1 artist tag, get rid of it.
  if echo $v1artist | grep -q "^artist"
  then
    echo "bogus v1 artist $v1artist, removing"
    id3v2 -1 -a"" "$file"
    v1artist=""
  fi

  # If file has bogus v1 title, get rid of it.
  if echo $v1title | grep -q "^title"
  then
    echo "bogus v1 title $v1title, removing"
    id3v2 -1 -t"" "$file"
    v1title=""
  fi

  # If file has bogus v2 artist tag, get rid of it.
  if echo $v2artist | grep -q "^artist"
  then
    echo "bogus v2 artist $v2artist, removing"
    id3v2 -2 -a\"\" "$file"
    v2artist=""
  fi

  # If file has bogus v2 title, get rid of it.
  if echo $v2title | grep -q "^title"
  then
    echo "bogus v2 title $v2title, removing"
    id3v2 -2 -t"" "$file"
    v2title=""
  fi

  # If file has v1 artist and title but no v2 artist or title,
  # convert the v1 tags to v2 tags.
  if [ -n "$v1artist" -a -n "$v1title" -a -z "$v2artist" -a -z "$v2title" ]
  then
    echo "converting v1 tags to v2"
    id3v2 -C "$file"
    artist=$v1artist
    title=$v1title
    v2title=$title
    v2artist=$artist
  fi

  if [ -n "$v2artist" -a -z "$v1artist" ]
  then
    # If file has v2 artist name, use it for v1 artist name as well.
    echo "copying v2 artist to v1 artist"
    id3v2 -a "$v2artist" "$file"
    artist=$v2artist
    v1artist=$v2artist
  elif [ -n "$v1artist" -a -z "$v2artist" ]
  then
    # Copy v1 artist to v2
    echo "copying v1 artist to v2 artist"
    id3v2 -a "$v1artist" "$file"
    artist=$v1artist
    v2artist=$artist
  else
    artist=$v2artist
  fi

  if [ -n "$v2title" -a -z "$v1title" ]
  then
    # If file has v2 song title, use it for v1 song title too.
    echo "copying v2 title to v1 title"
    id3v2 -t "$v2title" "$file"
    title=$v2title
    v1title=$title
  elif [ -n "$v1title" -a -z "$v2title" ]
  then
    # Copy v1 title to v2.
    echo "copying v1 title to v2 title"
    id3v2 -t "$v1title" "$file"
    title=$v1title
    v2title=$title
  else
    title=$v2title
  fi

  # If v2title is a subset of the title we parsed from the filename, substitute
  # the filename title for the v2title (because v2title probably got truncated)
  # also skip this if v2title is just empty, otherwise the grep always matches.
  if [ "$fNameTitle" != "$v2title" ] && \
    [ x"$v2title" != x"" ] && \
    echo "$fNameTitle" | grep -q "^$v2title"
  then
    echo "v2title is subset of filename title.  Restoring v2title"
    id3v2 -t "$fNameTitle" "$file"
    v2title=$fNameTitle
    title=$v2title
  fi

  # Make sure the filename is sensible
  ReCheck=yes
  until [ x"$ReCheck" = xno ]
  do
    CheckFileName && ReCheck=no
  done

  rm -f $TEMPFILE
done