#!/usr/bin/perl
use strict;
use vars qw($VERSION  @FILES);
use Getopt::Std::Strict 'dhvb:';
use LEOCHARRE::DEBUG;
use Cwd;
use Carp;
$VERSION = sprintf "%d.%02d", q$Revision: 1.1.1.1 $ =~ /(\d+)/g;

init();

do_one($_) for @FILES;

exit;







# - - #



sub do_one {
   my $abs = shift;
   my $bitrate = $opt_b;   

   my $abs_tmp = "$abs.tmp.mp3";

   # any tags
   my($artist,$album,$song);

   my $out = `id3info "$abs"`;
   $? and die("error id3info $abs , $?");


   if( $out=~/TPE1.+\:(.+)\n/ ){
      $artist = $1;
      $artist=~s/^\s+|\s+$//g;
   }
   if ($out=~/TALB.+\:(.+)\n/ ){
      $album = $1;
      $album=~s/^\s+|\s+$//g;
   }
   if ($out=~/TIT2.+\:(.+)\n/ ){
      $song = $1;
      $song=~s/^\s+|\s+$//g;
   }

   debug("artist $artist, album $album, song $song");

   system( 'lame' ,'-b', $bitrate, $abs, $abs_tmp ) == 0 or die($?);

   if($artist){ system( 'id3tag','--artist',$artist, $abs_tmp) ==0 or die($?) }
   if($album){ system( 'id3tag','--album',$album, $abs_tmp) ==0 or die($?) }
   if($song){ system( 'id3tag','--song',$song, $abs_tmp) ==0 or die($?) }

   system('mv',$abs_tmp,$abs) ==0 or die($?);

   debug("$abs done.");   

}












exit;



sub usage {
   qq{$0 - reduce mp3 size keeping basic id3 tags

DESCRIPTION

I had some mp3s in a package that needed to be smaller for portability.
I wanted to keep the tags though, the basic artist, album, and song tags- if present.
Lame did not do this by default. So.. here.

OPTIONS

   -d          debug on
   -h          help
   -v          version and exit
   -b number   bitrate, 18 default

AUTHOR

Leo Charre leocharre at cpan dot org

SEE ALSO

}}

sub init {
   $::DEBUG = 1 if $opt_d;
   $opt_h and print usage() and exit;
   $opt_v and print $VERSION and exit;

   for (grep { /\.mp3$/i } @ARGV){
      my $abs = Cwd::abs_path($_) or die("cant resolve $_");
      -f $abs or die("not file $abs");
      push @FILES, $abs;
   }
   scalar @FILES or die("no files");
   $opt_b ||= 18;   
}