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#!/usr/bin/perl
# Copyright (C) 2011-2017 Daniel "Trizen" Șuteu
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <https://www.gnu.org/licenses/>.
#
#-------------------------------------------------------
# Appname: srt-delay
# Version: 0.0.6
# Created: 26 December 2011
# Edit on: 19 October 2020
# https://github.com/trizen
#-------------------------------------------------------
use 5.014;
use strict;
use warnings;
use Getopt::Long qw(GetOptions);
sub usage {
my ($exit_code) = @_;
print <<"USAGE";
usage: $0 [options] [seconds] [file.srt]
Options:
-b --backup : backup original to .bak
-d --delay=f : number of seconds of delay
-s --scale=f : scale the timestamps by a multiple
Examples: $0 -b -d=1.439 file.srt
$0 -b -d=0.321 file.srt
$0 -b -d=-3.14 file.srt
USAGE
exit($exit_code // 0);
}
sub time2sec {
my @out;
foreach my $time (@_) {
my ($hours, $min, $sec, $milisec) = split(/[:,]/, $time, 4);
push @out, $hours * 3600 + $min * 60 + $sec + $milisec / 1000;
}
return @out;
}
sub sec2time {
my @out;
foreach my $sec (map { sprintf '%.3f', $_ } @_) {
push @out,
sprintf('%02d:%02d:%02d,%03d', ($sec / 3600 % 24, $sec / 60 % 60, $sec % 60, substr($sec, index($sec, '.') + 1)));
}
return @out;
}
my $delay = 0;
my $backup = 0;
my $scale = 1;
GetOptions(
"b|backup!" => \$backup,
"s|scale=f" => \$scale,
"d|delay=f" => \$delay,
"h|help" => sub { usage(0) },
)
or die("Error in command line arguments");
my @files = grep { -f $_ } @ARGV;
@files || usage(2);
foreach my $file (@files) {
my @output;
open my $fh, '<', $file or die "Unable to open for read ${file}: $!\n";
while (defined(my $line = <$fh>)) {
if ($line =~ /^\d+:\d+:\d+(?:,\d+)?\s*-->\s*\d+:\d+:\d+(?:,\d+)?(\s*)\z/) {
push @output, join(
' --> ',
sec2time(
map {
my $sec = $scale * $_ + $delay;
($sec >= 0)
? $sec
: !warn "[!] Time cannot be lower than zero at line $.\n";
} time2sec(split(/\s*-->\s*/, $line, 2))
)
)
. $1;
}
else { push @output, $line }
}
close $fh;
rename $file, "$file.bak" if $backup;
open $fh, '>', $file or die "Unable to open for write ${file}: $!\n";
print {$fh} @output;
close $fh;
}
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