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Perl recursive directory MP3 bitrate thing

 
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compactwater
I post too much
Reputation: 8

Joined: 02 Aug 2006
Posts: 3923
PostPosted: Sun Jun 20, 2010 2:33 pm    Post subject: Perl recursive directory MP3 bitrate thing Reply with quote
Usage:
perl mp3bitrate.pl "X:\musik\supercoolband"
Also OK:
perl mp3bitrate.pl "X:/musik/supercoolband"
Also OK, but stupid:
perl mp3bitrate.pl "X:/musik\supercoolband"
Not OK!
perl mp3bitrate.pl "X:\musik\supercoolband\"
OK!
perl mp3bitrate.pl "X:\musik\supercoolband\\"

It will output something like this:
128 => 42
192 => 22
320 => 35
Average bitrate: 210.10101010101

Code:
use strict;
use warnings;
use MP3::Info;

my $dir = shift; #shift directory to recursively search for MP3s
my $filecount = 0; #number of MP3s found (and did not fail)
my $addrates = 0; #total bitrate of all files found
my $currate; #stores the current MP3's bitrate
my %bitrates; #counts the number of files with a specific bitrate (may replace $failcount)

process_files($dir);

sub process_files {
    my $path = shift;
    opendir (DIR, $path)
        or die "Unable to open $path: $!";
    my @files = grep { !/^\.{1,2}$/ } readdir (DIR);

    closedir (DIR);
    @files = map { $path . '/' . $_ } @files;
    for (@files) {
        if (-d $_) {
            process_files ($_);
        } else { if (($_ =~ m/([^.]+)$/)[0] eq 'mp3') {
                if (my $mp3 = new MP3::Info $_)
                {
                    $currate = $mp3->bitrate;
                    $bitrates{$currate}++;
                }
                else
                {
                    $bitrates{'fail'}++;
                    print "Fail no. $bitrates{'fail'} on $_\n";
                }
            }
        }
    }
}

foreach my $key (sort (keys(%bitrates))) {
   print "$key => $bitrates{$key}\n";
   if ($key eq 'fail') { last; }
   $addrates += $key * $bitrates{$key};
   $filecount += $bitrates{$key};
}
print "Average bitrate: " . ($addrates / $filecount);
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Noz3001
I'm a spammer
Reputation: 26

Joined: 29 May 2006
Posts: 6220
Location: /dev/null
PostPosted: Sun Jun 20, 2010 6:00 pm    Post subject: Reply with quote
Code:
[nathan@GLaDOS Desktop]$ perl m.pl ~/Music
Can't locate MP3/Info.pm in @INC (@INC contains: /etc/perl /usr/local/lib/perl/5.10.1 /usr/local/share/perl/5.10.1 /usr/lib/perl5 /usr/share/perl5 /usr/lib/perl/5.10 /usr/share/perl/5.10 /usr/local/lib/site_perl .) at m.pl line 3.
BEGIN failed--compilation aborted at m.pl line 3.
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