From 77a42fe95ad9717df039219b5f975959893b2807 Mon Sep 17 00:00:00 2001
From: moex3 <46636583+moex3@users.noreply.github.com>
Date: Sun, 14 Mar 2021 00:26:12 +0100
Subject: [PATCH] Push code

---
 flac-mass-transcode.pl | 160 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 160 insertions(+)
 create mode 100755 flac-mass-transcode.pl

diff --git a/flac-mass-transcode.pl b/flac-mass-transcode.pl
new file mode 100755
index 0000000..3d1e0fe
--- /dev/null
+++ b/flac-mass-transcode.pl
@@ -0,0 +1,160 @@
+#!/usr/bin/env perl
+use strict;
+use warnings;
+use File::Path;
+use Getopt::Long;
+use File::Copy qw(copy);
+
+## Parse arguments
+
+my $updir = 0;
+my $help = 0;
+GetOptions(
+	"help" => \$help,
+	"updir=i" => \$updir)
+or die("Error in command line options");
+
+if ($help) {
+	help();
+}
+
+if (scalar @ARGV != 2) {
+	print("Bad arguments\n");
+	usage();
+}
+my ($IDIR, $ODIR) = @ARGV;
+
+my @flacMapPaths = mapInputToOutput($IDIR, $ODIR, q(*.flac));
+my $sizeLength = scalar @flacMapPaths != 0 ? int(log(scalar @flacMapPaths / 2)/log(10)) : 0;
+
+## Transcode here
+for (my $i = 0; $i < @flacMapPaths; $i += 2) {
+	my $inp = $flacMapPaths[$i  ];
+	my $out = $flacMapPaths[$i+1];
+	$out =~ s/\.flac$/.opus/;
+	next if (-e $out);
+	File::Path::make_path(dirname($out));
+	$inp = qq($inp);
+	$out = qq($out);
+	my $coverOpts = "";
+	my $cover = undef;
+	if (!hasImage($inp) && defined($cover = getcover($inp))) {
+		$coverOpts .= qq(--picture "$cover");
+		print("## Adding cover $cover ##\n");
+	}
+	printf("[%0*d/%d] %s -> %s\n", $sizeLength, $i/2+1, @flacMapPaths / 2, $inp, $out);
+	`opusenc --music --comp 10 $coverOpts -- "$inp" "$out"`;
+}
+
+print("## Starting copying files ##\n");
+my @plainMapPaths = mapInputToOutput($IDIR, $ODIR, "*.mp3' -o -iname '*.m4a' -o -iname '*.ogg' -o -iname '*.opus");
+$sizeLength = scalar @plainMapPaths != 0 ? int(log(scalar @plainMapPaths / 2)/log(10)) : 0;
+
+## Just copy here
+for (my $i = 0; $i < @plainMapPaths; $i += 2) {
+	my $inp = $plainMapPaths[$i  ];
+	my $out = $plainMapPaths[$i+1];
+	next if (-e $out);
+	# TODO? Add covers to these too? Naaah
+	File::Path::make_path(dirname($out));
+	printf("[%0*d/%d] %s -> %s\n", $sizeLength, $i/2+1, @plainMapPaths / 2, $inp, $out);
+	copy($inp, $out);
+}
+
+print("\n## Conversion done! ##\n");
+exit(0);
+
+###############################################################################
+###############################################################################
+
+## Return a list of string pairs that maps like this:
+##  original file name, output file name ...
+## Args:
+##  1) input  directory
+##  2) output directory
+##  3) iname option for find
+sub mapInputToOutput {
+	my $inpDir = shift;
+	my $outDir = shift;
+	my $fglob  = shift;
+
+	## Get the path of every file in the given directory, and below it
+	my @files = qx(find "$inpDir" -type f -iname '$fglob');
+	## Get directories where files are located
+	my @dirs;
+	foreach my $file (@files) {
+		#$file =~ s/\R//;
+		chomp($file);
+		my $found = 0;
+		my $dirn = dirname($file);
+		foreach my $dir (@dirs) {
+			if ($dir eq $dirn) {
+				$found = 1;
+				last;
+			}
+		}
+		if (!$found) {
+			push(@dirs, $dirn);
+		}
+	}
+
+	my @splitInpDir = split("/", $inpDir);
+	my @plusDirs = @splitInpDir[scalar @splitInpDir - $updir..scalar @splitInpDir - 1];
+	my $outpath = "$outDir/" . join("/", @plusDirs);
+
+	my @result;
+	foreach my $file (@files) {
+		chomp($file);
+		my $outfname = "$outpath/" . substr($file, length $inpDir);
+		my $inp = qq($file);
+		my $out = qq($outfname);
+		push(@result, $file);
+		push(@result, $outfname);
+	}
+	return @result;
+}
+
+## Easy, just print how to use
+sub usage {
+	print("Usage: $0 [-h | --help] [-u | --uplevel NUM] <input_dir> <output_dir>\n");
+	exit 1;
+}
+
+sub help {
+	my $h = <<EOF;
+Usage:
+	flac-mass-transcode.pl [options] <input_dir> <output_dir>
+	
+	-h, --help		print this help text
+	-u, --uplevel	take this number of directories from the input path
+EOF
+	print("$h");
+	exit 0;
+}
+
+## Get the directory of the file
+## /a/b/c.flac -> /a/b
+sub dirname {
+	my $str = shift;
+	my $ind = rindex($str, '/');
+	return substr($str, 0, $ind);
+}
+
+## Search for a cover image in the given path
+sub getcover {
+	my $flacpath = shift;
+	my $dir = dirname($flacpath);
+	my $regex = "\\(thumb\\|albumartwork\\|cover\\|folder\\)\\.\\(pn\\|jp\\)g\$";
+	my $cmd = "find '$dir' -maxdepth 20 -type f -iregex '.*/$regex'";
+	my @imgs = split(/\n/, `$cmd`);
+	return undef if scalar(@imgs) == 0;
+	return $imgs[0];
+}
+
+## Checks if a flac file has a cover embedded or not
+sub hasImage {
+	my $flacpath = shift;
+	my $fname = qq($flacpath);
+	my $lines = `metaflac --list --block-type=PICTURE "$fname" | wc -l`;
+	return $lines != 0;
+}