#!/usr/bin/perl
#
# Copyright (c) 2004 - Jason L. Buberel - jason@buberel.org
# Copyright (c) 2007 - Evan Boggs - etboggs@indiana.edu
# http://www.buberel.org/linux/batch-flac-to-ogg-converter.php
# Licensed under the GNU GPL.
#
# Given a source directory tree of FLAC files, this script will 
# recreate (or add to) a new directory tree of Ogg files by 
# recursively encoding only new FLAC files to Ogg.  The source and 
# destination directories can be hard-coded using the $sourceDirPrefix 
# and $destDirPrefix variables or passed on the command line.  The 
# command line options are: 
#   flac2ogg.pl --source=/source/dir --dest=/dest/dir --quality=n --force
#   --source= The path to the top-most directory containing your FLAC files.
#   --dest= The path to the directory where you want the Ogg files to go.
#   --quality=n where n is a number between 1 and 10, 10 being the best quailty.
#   --force Overwrite the Ogg file, even if it already exists
#
# If you are piping the output to a log file it would also be good to 
# modify line 92 so that the encoder command is silent (this is done 
# using -Q or --quiet).  

use Getopt::Long;
use File::stat;

$sourceDirPrefix = "/home/user/FLAC";
$destDirPrefix = "/home/user/Ogg";
$quality = 6;
GetOptions ( "source:s" => \$sourceDirPrefix,
             "dest:s" => \$destDirPrefix,
             "quality:i" => \$quality,
             "force" => \$force );

# Commands:
$oggCommand = "/usr/bin/oggenc";
$flacCommand = "/usr/bin/flac";

@dirs = `cd "$sourceDirPrefix" && find . -type d -print`;
@files = `cd "$sourceDirPrefix" && find . -type f -name "*.flac" -print`;

# Check to see if our find command found anything to convert.
if ( scalar @files == 0 ) {
    die "Found no .flac files to convert!";
}

# Recreate the directory hierarchy.
foreach $dir (@dirs) {
    $dir =~ s/\n$//;
    $dir =~ s/^\.\///;
    
    # check to see if the destination dir already exists
    if ( !(stat ("$destDirPrefix/$dir")) ) {
        # stat failed so create the directory
        print "Creating output dir:\n   $destDirPrefix/$dir\n";
        $dir =~ s/\`/\'/g;
        $result = `cd "$destDirPrefix" && mkdir -p "$dir"`;
    }

}

# Now process the actual sound files.
foreach $file (@files) {
    $file =~ s/\n$//;
    $file =~ s/^\.\///;
    #print "F: $destDirPrefix/$file\n";
    
    # Figure out what the destination file would be...
    $destinationFile = $file;
    $destinationFile =~ s/\.flac$/\.ogg/;
    #print "D: $destinationFile\n";
    
    # Now stat the destinationFile, and see if it's date is more recent
    # than that of the original file. If so, we re-encode.
    # We also re-encode if the user supplied --force
    $srcInfo = stat ("$sourceDirPrefix/$file");
    $srcModTime = $srcInfo->mtime;
    $destInfo = stat ("$destDirPrefix/$destinationFile");
    if ( $destInfo ) {
        $destModTime = $destInfo->mtime;
        # print "DEST_MOD: $destModTime :: SRC_MOD: $srcModTime :: FORCE: $force\n"; 
    }
    # If the destination file does not exist, or the user specified force,
    # or the srcfile is more recent then the dest file, we encode.
    if ( !$destInfo || $force || ( $srcModTime > $destModTime) ) {
        $file =~ s/\`/\'/g;
        $inFile = "$sourceDirPrefix/$file" . "c";
        chop ($inFile);
        $outFile = "$destDirPrefix/$destinationFile" . "g";
        chop ($outFile);
        print "ENCODE: $file ==> \n\t$destinationFile\n"; 
        $inFile =~ s/\0//g; $outFile =~ s/\0//g;
        $result = `$oggCommand -q $quality -o "$outFile" "$inFile"`;
    }
        
}