use strict;
use encoding "utf8";
+use POSIX qw(ceil);
+use Digest::SHA;
use MusicBrainz::DiscID;
use WebService::MusicBrainz::Release;
use WebService::MusicBrainz::Artist;
my $FRAMES_PER_SEC = 75;
-my ($device, $command, $workdir);
+my ($device, $command, $discid, @discinfo, $workdir);
Getopt::Long::Configure ('no_ignore_case');
Getopt::Long::Configure ('no_auto_abbrev');
-GetOptions ("device=s" => \$device,
- "command=s" => \$command,
- "workdir=s" => \$workdir);
+GetOptions ("device=s" => \$device,
+ "command=s" => \$command,
+ "discid=s" => \$discid,
+ "discinfo=i{5,}" => \@discinfo,
+ "workdir=s" => \$workdir);
if (!defined($device)) {
$device = "/dev/cdrom";
$workdir = "/tmp";
}
-my $disc = new MusicBrainz::DiscID($device);
-
-# read the disc in the default disc drive */
-if ( $disc->read() == 0 ) {
- printf STDERR "Error: %s\n", $disc->error_msg();
- exit(1);
+sub calc_sha1($) {
+ my $filename = shift;
+ my $s = Digest::SHA->new(1);
+ $s->addfile($filename);
+ return $s->hexdigest;
}
-if ($command =~ m/id/) {
+if ($command =~ m/^id/) {
+ my $disc = new MusicBrainz::DiscID($device);
+
+ # read the disc in the default disc drive */
+ if ( $disc->read() == 0 ) {
+ printf STDERR "Error: %s\n", $disc->error_msg();
+ exit(1);
+ }
printf("%s ", $disc->id());
printf("%d ", $disc->last_track_num() + 1 - $disc->first_track_num());
printf("%d ", $disc->track_offset($i));
}
printf("%d\n", $disc->sectors() / $FRAMES_PER_SEC);
+ undef $disc;
} elsif ($command =~ m/data/) {
my $ws = WebService::MusicBrainz::Release->new();
- my $response = $ws->search({ DISCID => $disc->id()});
+ my $response = $ws->search({ DISCID => $discid });
my @releases = $response->release_list();
my $releasenum = 0;
+ my @sums;
foreach my $release (@releases) {
my $a_artist = $release->artist()->name();
print OUT "# xmcd style database file\n";
print OUT "#\n";
print OUT "# Track frame offsets:\n";
- for ( my $i = $disc->first_track_num;
- $i <= $disc->last_track_num; $i++ ) {
- print OUT "# " . $disc->track_offset($i) . "\n";
+ # Assume standard pregap
+ my $total_len = 2000;
+ my @tracks = @{$release->track_list()->tracks()};
+ for (my $i = 0; $i < scalar(@tracks); $i++) {
+ printf OUT "# %d\n", ceil($total_len * $FRAMES_PER_SEC / 1000.0);
+ $total_len += $tracks[$i]->duration();
}
print OUT "#\n";
- printf OUT "# Disc length: %d seconds\n", $disc->sectors() / $FRAMES_PER_SEC;
+ printf OUT "# Disc length: %d seconds\n", $total_len / 1000.0;
print OUT "#\n";
print OUT "# Submitted via: XXXXXX\n";
print OUT "#\n";
print OUT "#blues,classical,country,data,folk,jazz,newage,reggae,rock,soundtrack,misc\n";
print OUT "#CATEGORY=none\n";
- print OUT "DISCID=" . $disc->id() . "\n";
+ print OUT "DISCID=" . $discid . "\n";
print OUT "DTITLE=" . $a_artist. " / " . $release->title() . "\n";
print OUT "DYEAR=\n";
print OUT "DGENRE=\n";
print OUT "PLAYORDER=\n";
print OUT ".\n";
close OUT;
+
+ # Check to see that this entry is unique; generate a checksum
+ # and compare to any previous checksums
+ my $checksum = calc_sha1("$workdir/cddbread.$releasenum");
+ foreach my $sum (@sums) {
+ if ($checksum eq $sum) {
+ unlink("$workdir/cddbread.$releasenum");
+ $releasenum--;
+ last;
+ }
+ }
+ push (@sums, $checksum);
+ }
+} elsif ($command =~ m/calcid/) {
+# Calculate MusicBrainz ID from disc offsets; see
+# http://musicbrainz.org/doc/DiscIDCalculation
+
+ my ($first, $last, $leadin, $leadout, @offsets) = @discinfo;
+
+ my $s = Digest::SHA->new(1);
+ $s->add(sprintf "%02X", int($first));
+ $s->add(sprintf "%02X", int($last));
+
+ my @a;
+ for (my $i = 0; $i < 100; $i++) {
+ $a[$i] = 0;
+ }
+ my $i = 0;
+ foreach my $o ($leadout, @offsets) {
+ $a[$i++] = int($o) + int($leadin);
+ }
+ for (my $i = 0; $i < 100; $i++) {
+ $s->add(sprintf "%08X", $a[$i]);
}
+
+ my $id = $s->b64digest;
+ # CPAN Digest modules do not pad their Base64 output, so we have to do it.
+ while (length($id) % 4) {
+ $id .= '=';
+ }
+
+ $id =~ tr#+#.#;
+ $id =~ tr#/#_#;
+ $id =~ tr#=#-#;
+
+ print $id;
}
-undef $disc;