#!/usr/bin/perl -w
# Copyright 2002 by Heiko Eißfeldt (Eissfeldt)
use strict;
use integer;

# read all .inf files and generate the binary cdtext block
# for cdrecord.

my @results;

sub fill_packet
{
	my $ID = shift;
	my $track = shift;
	my $seq_nr = shift;
	my $charpos = shift;
	my $text = shift;
	my $todo = shift;

	return if (!defined($$text));

	my @packet = ();
	push @packet, chr($ID);	# track title, performer, ...
	push @packet, chr($$track);
	push @packet, chr($$seq_nr);
	$$charpos = 15 if ($$charpos > 15);
	push @packet, chr($$charpos);

	my $cp = 0;
	my $tracks_inp = 0;
	while (length($$text) + 1 < 12 - $cp) {
		push @packet, split(//, $$text);
		push @packet, chr(0);
		$cp += length($$text) + 1;
		$$charpos = 0;
		$tracks_inp++;

		$$text = shift @$todo;
		if ($#$todo < 1 && (!defined($$text) || $$text eq "") ) {
			push @packet, (chr(0)) x (12 - $cp);
			$$seq_nr++;
			print_packet(@packet);
			return;
		}
		$$text = "" if (!defined($$text));
		$$track++;
	}

	# packet gets full
	my $left = 12 - $cp;
	if ($left > length($$text)) {
		# title fits into packet
		push @packet, split(//, $$text);
		push @packet, chr(0);
		$tracks_inp++;
		print_packet(@packet);

		$$charpos = 0;
		$$text = shift @$todo;
		unless ((!defined($$text) || $$text eq "") && $#$todo < 1) { $$track++; }
		$$seq_nr++;
	} else {
		# print current packet and more if more entries are present
		push @packet, split(//, substr($$text, 0, $left));
		print_packet(@packet);

		$$text = substr($$text, $left);
		$$charpos += $left;
		$$seq_nr++;
	}
}

my @crctab =(
    0x0000,  0x1021,  0x2042,  0x3063,  0x4084,  0x50a5,  0x60c6,  0x70e7,
    0x8108,  0x9129,  0xa14a,  0xb16b,  0xc18c,  0xd1ad,  0xe1ce,  0xf1ef,
    0x1231,  0x0210,  0x3273,  0x2252,  0x52b5,  0x4294,  0x72f7,  0x62d6,
    0x9339,  0x8318,  0xb37b,  0xa35a,  0xd3bd,  0xc39c,  0xf3ff,  0xe3de,
    0x2462,  0x3443,  0x0420,  0x1401,  0x64e6,  0x74c7,  0x44a4,  0x5485,
    0xa56a,  0xb54b,  0x8528,  0x9509,  0xe5ee,  0xf5cf,  0xc5ac,  0xd58d,
    0x3653,  0x2672,  0x1611,  0x0630,  0x76d7,  0x66f6,  0x5695,  0x46b4,
    0xb75b,  0xa77a,  0x9719,  0x8738,  0xf7df,  0xe7fe,  0xd79d,  0xc7bc,
    0x48c4,  0x58e5,  0x6886,  0x78a7,  0x0840,  0x1861,  0x2802,  0x3823,
    0xc9cc,  0xd9ed,  0xe98e,  0xf9af,  0x8948,  0x9969,  0xa90a,  0xb92b,
    0x5af5,  0x4ad4,  0x7ab7,  0x6a96,  0x1a71,  0x0a50,  0x3a33,  0x2a12,
    0xdbfd,  0xcbdc,  0xfbbf,  0xeb9e,  0x9b79,  0x8b58,  0xbb3b,  0xab1a,
    0x6ca6,  0x7c87,  0x4ce4,  0x5cc5,  0x2c22,  0x3c03,  0x0c60,  0x1c41,
    0xedae,  0xfd8f,  0xcdec,  0xddcd,  0xad2a,  0xbd0b,  0x8d68,  0x9d49,
    0x7e97,  0x6eb6,  0x5ed5,  0x4ef4,  0x3e13,  0x2e32,  0x1e51,  0x0e70,
    0xff9f,  0xefbe,  0xdfdd,  0xcffc,  0xbf1b,  0xaf3a,  0x9f59,  0x8f78,
    0x9188,  0x81a9,  0xb1ca,  0xa1eb,  0xd10c,  0xc12d,  0xf14e,  0xe16f,
    0x1080,  0x00a1,  0x30c2,  0x20e3,  0x5004,  0x4025,  0x7046,  0x6067,
    0x83b9,  0x9398,  0xa3fb,  0xb3da,  0xc33d,  0xd31c,  0xe37f,  0xf35e,
    0x02b1,  0x1290,  0x22f3,  0x32d2,  0x4235,  0x5214,  0x6277,  0x7256,
    0xb5ea,  0xa5cb,  0x95a8,  0x8589,  0xf56e,  0xe54f,  0xd52c,  0xc50d,
    0x34e2,  0x24c3,  0x14a0,  0x0481,  0x7466,  0x6447,  0x5424,  0x4405,
    0xa7db,  0xb7fa,  0x8799,  0x97b8,  0xe75f,  0xf77e,  0xc71d,  0xd73c,
    0x26d3,  0x36f2,  0x0691,  0x16b0,  0x6657,  0x7676,  0x4615,  0x5634,
    0xd94c,  0xc96d,  0xf90e,  0xe92f,  0x99c8,  0x89e9,  0xb98a,  0xa9ab,
    0x5844,  0x4865,  0x7806,  0x6827,  0x18c0,  0x08e1,  0x3882,  0x28a3,
    0xcb7d,  0xdb5c,  0xeb3f,  0xfb1e,  0x8bf9,  0x9bd8,  0xabbb,  0xbb9a,
    0x4a75,  0x5a54,  0x6a37,  0x7a16,  0x0af1,  0x1ad0,  0x2ab3,  0x3a92,
    0xfd2e,  0xed0f,  0xdd6c,  0xcd4d,  0xbdaa,  0xad8b,  0x9de8,  0x8dc9,
    0x7c26,  0x6c07,  0x5c64,  0x4c45,  0x3ca2,  0x2c83,  0x1ce0,  0x0cc1,
    0xef1f,  0xff3e,  0xcf5d,  0xdf7c,  0xaf9b,  0xbfba,  0x8fd9,  0x9ff8,
    0x6e17,  0x7e36,  0x4e55,  0x5e74,  0x2e93,  0x3eb2,  0x0ed1,  0x1ef0,
);

sub add_crc
{
	# crc with polynomial: x^16 + x^12 + x^5 + 1
	# 1,0001,0000,0010,0001
	my $packref = shift;
	my $crc = 0;

	foreach (@$packref) {
		$crc = ($crc << 8) ^ $crctab[
					( ($crc >> (16-8)) ^ ord($_) ) & 0xff
					];
		$crc &= 0xffff;
	}
	$$packref[16] = chr((($crc >> 8) & 0xff) ^ 0xff);
	$$packref[17] = chr(($crc & 0xff) ^ 0xff);
}

sub print_packet
{
	return if ($#_ < 1);
	my @packet = (@_);
	add_crc(\@packet);
	if ($packet[0] ne chr(0x8f)) {
		printf STDERR ("%02x "x4 ." "."%c "x12 ." "."%02x "x2), map( defined($_) ? ord($_) : "___undef", @packet );
	} else {
		printf STDERR ("%02x "x4 ." "."%02x "x12 ." "."%02x "x2), map( defined($_) ? ord($_) : "___undef", @packet );
	}
	printf STDERR "\n";
	push @results, @packet;
}

my $defaultperformer = $ARGV[0] || die "usage: ", $^X, " defaultperformer_name\n";
my $prefix = $ARGV[1] || "audio";
@ARGV = glob("${prefix}_??.inf");
my @albumtitles;
my @tracktitles;
my @performers;
my $ISRC;
my @ISRCs;
my $MCN;

my $performer;
while (<>) {
	if (/^Performer=\s+'(.*?)'$/) {
		$performer = $1;
	}
	if (/^Albumtitle=\s+'(.*?)'$/) {
		push @albumtitles, $1;
	}
	if (/^Tracktitle=\s+'(.*?)'$/) {
		push @tracktitles, $1;
	}
	if (/^ISRC=\s+(\S+?)$/) {
		$ISRC = $1;
	}
	if (/^MCN=\s+(\S+?)$/) {
		$MCN = $1;
	}
	if (eof) {
		close ARGV;
		$performer = $defaultperformer if (!defined($performer));
		push @performers, $performer;
		$performer = undef;
		push @ISRCs, $ISRC;
		$ISRC = undef;
	}
}

#
my $seq_nr = 0;

my @todo;
my $text;
my $track;
my $charpos;

# build cdtext packets

# build track titles
@todo = ($albumtitles[0], @tracktitles);
$text = shift @todo;
$track = 0;
$charpos = 0;

while ($#todo > 1 || defined($text)) {
	fill_packet(0x80, \$track, \$seq_nr, \$charpos, \$text, \@todo);
}

my $trackpacks = $seq_nr;	# store for later reference
my $last_track = $track;

# build performer entries
#@todo = ($performer) x (1 + scalar(@tracktitles));
@todo = ($defaultperformer, @performers);
$text = shift @todo;
$track = 0;
$charpos = 0;

while ($#todo > 1 || defined($text)) {
	fill_packet(0x81, \$track, \$seq_nr, \$charpos, \$text, \@todo);
}

my $perfpacks = $seq_nr - $trackpacks;	# store for later reference

# build ISRC entries
@todo = ($MCN, @ISRCs);
$text = shift @todo;
$track = 0;
$charpos = 0;

while ($#todo > 1 || defined($text)) {
	$text = "" if (!defined($text));
	fill_packet(0x8e, \$track, \$seq_nr, \$charpos, \$text, \@todo);
}

my $isrcpacks = $seq_nr - $trackpacks - $perfpacks;	# store for later reference

# build size information blocks
my $size1 = chr(0) . chr(1) . chr($last_track) . chr(0)
	 . chr($trackpacks) . chr($perfpacks) . chr(0) x 5;
my $size2 = chr(0) x 6 . chr($isrcpacks) . chr(3) . chr($seq_nr+2) . chr(0) x 2;
my $size3 = chr(0) x 4 . chr(9);	# hard coded language 09 = english
@todo = ($size1, $size2, $size3);
$text = shift @todo;
$track = 0;
$charpos = 0;

while ((defined($text) && $text ne "") ) {
	fill_packet(0x8f, \$track, \$seq_nr, \$charpos, \$text, \@todo);
}

# write out the results
my $size = @results + 2;
print chr($size >> 8), chr($size & 0xff), chr(0), chr(0), @results;