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=head1 NAME |
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Convert::CD::Analyze - dirty incorrect guessing of img tracks. |
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=head1 SYNOPSIS |
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use Convert::CD::Analyze; |
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# see Convert::CD::TOCFile |
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=head1 DESCRIPTION |
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Try to autodetect the tracks in a monolithic cd image. |
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Audio tracks cannot be guessed (they are basically just binary data), |
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while many other formats can. So far, only ISO filesystems are detected, |
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and the space before and after them is ignored. |
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This even works for uncompressed .fcd and similar files. |
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=head2 Convert:CD::Analyze METHODS |
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=over 4 |
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=cut |
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package Convert::CD::Analyze; |
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$VERSION = 0.01; |
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use Carp; |
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use Convert::CD::Track; |
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use base Convert::CD::TOCFile; |
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=item new param => value... |
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Create a new Convert::CD::Analyze object. |
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Parameters: |
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path the base image filename |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = bless { @_, }, $class; |
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$self; |
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} |
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sub _read { |
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my ($self, $cd) = @_; |
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defined $self->{path} |
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or croak "no path specified"; |
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open my $img, "<", $self->{path} |
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or croak "$self->{path}: $!"; |
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# scan through the image, if necessary through the full image |
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# we are dumb, to instead of using an intelligent algorithm, we just |
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# use an overlapping buffer |
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my $buf; |
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my $secsize; |
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my $isoofs; |
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my $bcd60 = join "", map sprintf ("\\x%02d", $_), 0..59; |
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my $bcd75 = join "", map sprintf ("\\x%02d", $_), 0..74; |
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my $sync = "\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\x00"; |
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my $msf = qr<(.)([$bcd60])([$bcd75])([\x00\x01\x02])>o; |
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#my $ |
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while (sysread $img, $buf, 256*1024, length $buf) { |
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# check sync 00 ff ff ff ff ff ff ff ff ff ff 00 M S F mode |
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# form1: 00 00 08 00 00 00 08 00 # form1 |
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# XA subheader format: FileNumber, ChannelNumber, SubMode, CodingInformation |
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# FileNumber = the unique ID for a single XA file |
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# ChannelNumber = the file is multimedia (1) or not (0) |
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# SubMode = XA content description: struct SubMode { uint8 EndOfRecord:1; |
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# CodingInformation = type of data: uint8 VideoData:1; |
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# 0x00 = empty/data sector uint8 ADCPM:1; |
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# 0x0f = video sector uint8 Data:1; |
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# 0x7f = audio sector uint8 TriggerOn:1; |
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# 0x80 = MPEG2 (SVCD) uint8 Form2:1; |
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# uint8 RealTime:1; |
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# uint8 EndOfFile:1; }; |
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# check for sync, then header and subheader |
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if ($buf =~ /$sync $msf (........)/sox) { |
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my ($m, $s, $f, $mode, $sub) = ( |
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(sprintf "%x", (ord $1) % 0xa0), |
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(sprintf "%x", ord $2), |
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(sprintf "%x", ord $3), |
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ord $4, |
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$5 |
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); |
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$|=1; |
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print "found raw sector $m:$s:$f $mode ".(unpack "H*", $sub)."\n"; |
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} |
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# check for iso |
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if ($buf =~ /\001CD001\001/g) { |
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my $dataofs; |
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my $mode; |
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my $ofs; |
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my $ofs1 = $-[0]; |
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if ($ofs1 > 24 && $sync eq substr $buf, $ofs1 - 24, 12) { |
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$dataofs = 24; |
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$ofs = $ofs1 - $dataofs; |
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$mode = MODE_MODE2; |
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} elsif ($ofs1 > 16 && $sync eq substr $buf, $ofs1 - 16, 12) { |
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$dataofs = 16; |
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$ofs = $ofs1 - $dataofs; |
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$mode = MODE_MODE1; |
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} else { |
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$dataofs = 0; |
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$mode = MODE_MODE1; |
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$ofs = $ofs1; |
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} |
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my $size = unpack "N", substr $buf, $ofs1 + 80 + 4, 4; |
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if ($buf =~ /[\000\001\002\003\004\377]CD001\001/g) { |
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my $ofs2 = $-[0]; |
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$secsize = $ofs2 - $ofs1; |
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$ofs -= 16 * $secsize; |
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warn "found ISO $dataofs $secsize $ofs $mode $size\n"; |
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$cd->append_track ( |
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mode => $mode, |
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secsize => $secsize, |
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rawsize => $size * $secsize, |
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offset => $ofs, |
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datasize => 2048, |
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dataoffset => $dataofs, |
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); |
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last; |
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} |
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} |
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substr $buf, 0, (length $buf) - 2448, ""; # some overlap + change |
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} |
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} |
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#sub _write { |
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# my ($self, $cd) = @_; |
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#} |
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1; |
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=back |
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=head1 AUTHOR |
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Marc Lehmann <pcg@goof.com> |
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=cut |
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