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Parallel download + tmp files purge on basic signal #7

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3 changes: 3 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,9 @@ Requirements
* URI Perl module.
Debian: liburi-perl

* Parallel::ForkManager Perl module.
Debian: libparallel-forkmanager-perl

Usage
-----

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88 changes: 62 additions & 26 deletions hls-fetch
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Original file line number Diff line number Diff line change
Expand Up @@ -22,12 +22,31 @@ use Getopt::Long;
use HTML::Parser;
use LWP::UserAgent;
use JSON;
use File::Temp qw(tempfile);
use File::Temp qw(tempdir);
use File::Path qw(rmtree);
use URI::URL;
use constant READ_SIZE => 1024;
use Parallel::ForkManager;

sub DIE_handler {
my ($dieString) = @_;
File::Temp::cleanup();
CORE::die "$dieString\n";
}

sub SIG_handler{
File::Temp::cleanup();
CORE::die "$!\n";
}

$SIG{__DIE__} = 'DIE_handler';
$SIG{'INT'} = 'SIG_handler';
$SIG{'ABRT'} = 'SIG_handler';
$SIG{'TERM'} = 'SIG_handler';
$SIG{'KILL'} = 'SIG_handler';

my %opt = ('bandwidth' => 'max');
Getopt::Long::GetOptions(\%opt, 'embedded', 'svtplay', 'playlist', 'output|o=s', 'bandwidth|b=s', 'quiet|q', 'force|f', 'verbose|v', 'no-decrypt', 'version', 'help') || exit 1;
Getopt::Long::GetOptions(\%opt, 'embedded', 'svtplay', 'playlist', 'output|o=s', 'bandwidth|b=s', 'nthread|n=i', 'quiet|q', 'force|f', 'verbose|v', 'no-decrypt', 'version', 'help') || exit 1;

if ($opt{'version'}) {
print "hls-fetch 0.1\n";
Expand All @@ -48,6 +67,7 @@ if ($opt{'help'}) {
print " -f, --force force overwriting existing output file\n";
print " -b, --bandwidth=SPEC pick video with specified bandwidth (bits/s),\n";
print " lowest (\"min\") or highest (\"max\") (default max)\n";
print " -n, --nthread number of process to download in parallel (default 10)\n";
print " -v, --verbose explain what is being done\n";
print " -q, --quiet no output other than errors\n";
print " --no-decrypt skip decryption even if stream should be decrypted\n";
Expand All @@ -67,13 +87,20 @@ if (!exists $opt{'output'}) {
$opt{'output'} = 'video.ts';
warn "no output file specified, assuming video.ts\n" if !$opt{'quiet'};
}
if (!exists $opt{'nthread'}) {
$opt{'nthread'} = 10;
warn "Using default amout of thread: 10\n" if !$opt{'quiet'};
}

my $forkmanager = new Parallel::ForkManager( $opt{'nthread'} );
my ($url) = @ARGV;
my $browser = LWP::UserAgent->new;
$browser->cookie_jar({});

my $video_file = $opt{'output'};
die "$video_file: file exists, not overwriting without -f/--force\n" if !$opt{'force'} && -e $video_file;
my $tmpdir = tempdir("hls-fetch-XXXXXXXXXX", CLEANUP => 1);

open(my $video_fh, '>', $video_file) || die "$video_file: cannot open file: $!\n";

if ($opt{'svtplay'}) {
Expand Down Expand Up @@ -183,21 +210,16 @@ foreach my $line (@lines) {
die "$url: no segments in playlist\n" if !scalar keys %segments;

my %cryptkeys;
#my $cryptkey;
#if (defined $cryptkey_url) {
# print "URL (key): $cryptkey_url\n" if $opt{'verbose'};
# $cryptkey = eval { fetch_url($cryptkey_url) }; die "$cryptkey_url: cannot fetch encryption key: $@" if $@;
# $cryptkey = join('', map { sprintf('%02x', ord) } split(//, $cryptkey));
# print "Key: $cryptkey\n" if $opt{'verbose'};
#}
print "Segments: ", scalar keys %segments, "\n" if $opt{'verbose'};

$| = 1;
foreach my $sequence (sort { $a <=> $b } keys %segments) {

my $segment = $segments{$sequence};
my $pid = $forkmanager->start and next;

my $segment_url = url($segment->{'url'}, $url)->abs()->as_string();
print "URL (segment $sequence): $segment_url\n" if $opt{'verbose'};
printf "\r%d/%d", $sequence, scalar keys %segments if !$opt{'quiet'} && !$opt{'verbose'};
printf "\rDownloading %d/%d", $sequence, scalar keys %segments if !$opt{'quiet'} && !$opt{'verbose'};

if (!$opt{'no-decrypt'} && defined $segment->{'cryptkey_url'} && !exists $cryptkeys{$segment->{'cryptkey_url'}}) {
print "URL (key): ", $segment->{'cryptkey_url'}, "\n" if $opt{'verbose'};
Expand All @@ -207,34 +229,48 @@ foreach my $sequence (sort { $a <=> $b } keys %segments) {
print "Key: $cryptkey\n" if $opt{'verbose'};
$cryptkeys{$segment->{'cryptkey_url'}} = $cryptkey;
}

my $segment_file = "$tmpdir/$sequence.ts";

my ($segment_fh, $segment_file) = tempfile();
open(my $segment_fh, '>', "$segment_file") || die "$segment_file: cannot open file: $!\n";
close $segment_fh;
eval {
eval { fetch_url($segment_url, $segment_file) }; die "$segment_url: cannot not fetch segment: $@" if $@;
eval { fetch_url($segment_url, "$segment_file") }; die "$segment_url: cannot not fetch segment: $@" if $@;
if (!$opt{'no-decrypt'} && defined $segment->{'cryptkey_url'}) {
my ($decrypt_fh, $decrypt_file) = tempfile();
open(my $decrypt_fh, '>', "$segment_file.decript") || die "$segment_file.decript: cannot open file: $!\n";
close $decrypt_fh;
my $iv = sprintf('%032x', $sequence);
my @cmd = ('openssl', 'aes-128-cbc', '-d', '-in', $segment_file, '-out', $decrypt_file, '-K', $cryptkeys{$segment->{'cryptkey_url'}}, '-iv', $iv);
my @cmd = ('openssl', 'aes-128-cbc', '-d', '-in', "$segment_file", '-out', "$segment_file.decript", '-K', $cryptkeys{$segment->{'cryptkey_url'}}, '-iv', $iv);
system @cmd;
unlink $segment_file || warn "$segment_file: cannot remove file: $!\n";
$segment_file = $decrypt_file;
unlink "$segment_file" || warn "$segment_file: cannot remove file: $!\n";
rename "$segment_file.decript", "$segment_file";
die "$segment_file: openssl failed (status $?)\n" if $? != 0;
}
open ($segment_fh, '<', $segment_file) || die "$segment_file: cannot open file: $!\n";
for (;;) {
my $size = sysread($segment_fh, $data, READ_SIZE);
die "$segment_file: cannot read from file: $!\n" if !defined $size;
last if $size == 0;
die "$video_file: cannot write to file: $!\n" if !defined syswrite($video_fh, $data);
}
close $segment_fh;
};
unlink $segment_file || warn "$segment_file: cannot remove file: $!\n";
die $@ if $@;

$forkmanager->finish;
}

$forkmanager->wait_all_children;
print "\nDownload completed...\n" if !$opt{'quiet'} && !$opt{'verbose'};
foreach my $sequence (sort { $a <=> $b } keys %segments) {
printf "\rReassembling stream %d/%d", $sequence, scalar keys %segments if !$opt{'quiet'} && !$opt{'verbose'};
my $segment_file = "$tmpdir/$sequence.ts";
open (my $segment_fh, '<', "$segment_file") || die "$segment_file: cannot open file: $!\n";
for (;;) {
my $size = sysread($segment_fh, $data, READ_SIZE);
die "$segment_file: cannot read from file: $!\n" if !defined $size;
last if $size == 0;
die "$video_file: cannot write to file: $!\n" if !defined syswrite($video_fh, $data);
}
close $segment_fh;
unlink $segment_file || warn "$segment_file: cannot remove file: $!\n";
}
rmtree $tmpdir;

close $video_fh;
print "\nStream reassembled!\n" if !$opt{'quiet'} && !$opt{'verbose'};

sub parse_m3u_attribs {
my ($url, $attr_str) = @_;
Expand Down