I am not sure about the rest of you, but I like to have my collection of Mp3's all in the same format (which makes sorting much easier). By this I mean having all mp3's named 'artist - name.mp3'. Here is some code to rename a directory of Mp3's into that format.
#!/usr/bin/perl
print "Enter the <dir> where the mp3's are found: ";
chomp ($dir = <stdin>);

chdir($dir) or die "Canot change $dir :$!\n";
opendir(DIR, $dir) or die "Cannot open $dir:$!\n"; 
@songs = readdir(DIR); 
closedir(DIR);
@songs=grep(/(.mp3)|(.MP3)|(.mP3)|(.Mp3)/,@songs);

foreach(@songs)
{
    if($_ =~ m/^(.*)\s*-\s*(.*).mp3/i)
    {
        my $end = $2;
        my $start = $1;
        $start =~ s/\s*$//;    
        s/{|}//g for ($start, $end);
        rename $_,"$start - $end.mp3";
        print "$start - $end.mp3\n";

    }
}

[download]

Replies are listed 'Best First'.
Re: Mp3 Renamer
by myocom (Deacon) on Jan 07, 2001 at 10:43 UTC

    This works, but it assumes that your files at least are in a format similar to artist-title.mp3. You might consider adding (artist)_title.mp3 or other common formats.

    Even more interesting would be to use MP3::Info to get information out of the ID3 tag to help determine if there's an artist/title in the filename, then rename it accordingly.

[reply]
[d/l]
[select]
      Good idea - I wanted to point out that when checking ID3 tags using MP3::Info that you should always first make sure that there is one: 
      while(<FILES>) {
   my $tag = get_mp3tag($file) or next;

   # do stuff
}

      [download]
      otherwise you could get some nasty results. ;)

      Jeff 

      L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
F--F--F--F--F--F--F--F--
(the triplet paradiddle)
[reply]
[d/l]
      Thanks for the replies. Here is an updated snippet: 
      #!/usr/bin/perl
print "Enter the <dir> where the mp3's are found: ";
chomp ($dir = <stdin>);

chdir($dir) or die "Canot change $dir :$!\n";
opendir(DIR, $dir) or die "Cannot open $dir:$!\n"; 
@songs = readdir(DIR); 
closedir(DIR);
@songs=grep(/(.mp3)|(.MP3)|(.mP3)|(.Mp3)/,@songs);

foreach(@songs)
{
    @id = id3check($_);
    if($id[0] && $id[1])
    {
        rename $_,"$id[0] - $id[1].mp3";
        print "$id[0] - $id[1].mp3\n";
    }
    elsif($_ =~ m/(\s*[^-]*)-\s*([^.]*).mp3/i)
    {
        my @id;
        $id[0] = $1;
        $id[1] = $2;
        s/\s*$|{|}//g for ($id[0], $id[1]);
        rename $_,"$id[0] - $id[1].mp3";
        print "$id[0] - $id[1]\n";
    }
    else
    {
        print "Could not rename $_\n";
    }
}
sub id3check
{
    if (open(FILE, '+<' . $_[0]))
    {
        my @id;
        binmode FILE;
        seek FILE,-128,2;
        read FILE,$tag,3;
        if($tag eq "TAG")
        {    
            read FILE,$id[0],30;
            read FILE,$id[1],30;
             s/\s*$|{|}//g for ($id[0],$id[1]);
             return @id;    
        }    

    }
}

      [download]
[reply]
[d/l]
                @songs=grep(/(.mp3)|(.MP3)|(.mP3)|(.Mp3)/,@songs); That's a good spot to use the /i regex modifier, which specifies case-insensitive matching:     @songs = grep /\.mp3$/i, @songs Escaping the period and adding the $ anchor are important to make sure you don't match files like 'abcmp3' or 'foo.mp3.txt'.
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[d/l]
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Re: Mp3 Renamer
by AltBlue (Chaplain) on Jan 16, 2001 at 23:10 UTC
    neh, for simple things there always are simple solutions!
    as myocom already adviced you, you should have taken a look to MP3::Info :(
    here is a simple oneliner that does all you wanted: 

    find2perl . -depth -eval 'my $t; -f and /\.mp3$/i and $t = get_mp3tag(
+$_) and rename $_, "$t->{ARTIST} - $t->{TITLE}.mp3"' |perl -MMP3::Inf
+o

    [download]

    --
    AltBlue.

[reply]
[d/l]
(redmist) Re: Mp3 Renamer
by redmist (Deacon) on Jan 07, 2001 at 16:13 UTC
[reply]
      What is the reason for this rule?

      While I agree that it is good to understand everything that Ovid said in that node, I don't agree that .* (or .*?) should be avoided as a matter of religious principle.

      But what do I know? I have been known to use goto. :-)

[reply]
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