File Coverage

blib/lib/Image/ExifTool/APE.pm

Criterion	Covered	Total	%
statement	81	89	91.0
branch	37	58	63.7
condition	8	18	44.4
subroutine	5	5	100.0
pod	0	2	0.0
total	131	172	76.1

#------------------------------------------------------------------------------
# File:         APE.pm
#
# Description:  Read Monkey's Audio meta information
#
# Revisions:    11/13/2006 - P. Harvey Created
#
# References:   1) http://www.monkeysaudio.com/
#               2) http://www.personal.uni-jena.de/~pfk/mpp/sv8/apetag.html
#------------------------------------------------------------------------------

package Image::ExifTool::APE;

use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);

$VERSION = '1.06';

# APE metadata blocks
%Image::ExifTool::APE::Main = (
    GROUPS => { 2 => 'Audio' },
    NOTES => q{
        Tags found in Monkey's Audio (APE) information.  Only a few common tags are
        listed below, but ExifTool will extract any tag found.  ExifTool supports
        APEv1 and APEv2 tags, as well as ID3 information in APE files, and will also
        read APE metadata from MP3 and MPC files.
    },
    Album   => { },
    Artist  => { },
    Genre   => { },
    Title   => { },
    Track   => { },
    Year    => { },
    DURATION => {
        Name => 'Duration',
        ValueConv => '$val += 4294967296 if $val < 0 and $val >= -2147483648; $val * 1e-7',
        PrintConv => 'ConvertDuration($val)',
    },
    'Tool Version' => { Name => 'ToolVersion' },
    'Tool Name'    => { Name => 'ToolName' },
);

# APE MAC header version 3.97 or earlier
%Image::ExifTool::APE::OldHeader = (
    PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
    GROUPS => { 1 => 'MAC', 2 => 'Audio' },
    FORMAT => 'int16u',
    NOTES => 'APE MAC audio header for version 3.97 or earlier.',
    0 => {
        Name => 'APEVersion',
        ValueConv => '$val / 1000',
    },
    1 => 'CompressionLevel',
  # 2 => 'FormatFlags',
    3 => 'Channels',
    4 => { Name => 'SampleRate', Format => 'int32u' },
  # 6 => { Name => 'HeaderBytes', Format => 'int32u' }, # WAV header bytes
  # 8 => { Name => 'TerminatingBytes', Format => 'int32u' },
    10 => { Name => 'TotalFrames', Format => 'int32u' },
    12 => { Name => 'FinalFrameBlocks', Format => 'int32u' },
);

# APE MAC header version 3.98 or later
%Image::ExifTool::APE::NewHeader = (
    PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
    GROUPS => { 1 => 'MAC', 2 => 'Audio' },
    FORMAT => 'int16u',
    NOTES => 'APE MAC audio header for version 3.98 or later.',
    0 => 'CompressionLevel',
  # 1 => 'FormatFlags',
    2 => { Name => 'BlocksPerFrame',   Format => 'int32u' },
    4 => { Name => 'FinalFrameBlocks', Format => 'int32u' },
    6 => { Name => 'TotalFrames',      Format => 'int32u' },
    8 => 'BitsPerSample',
    9 => 'Channels',
    10 => { Name => 'SampleRate',      Format => 'int32u' },
);

# APE Composite tags
%Image::ExifTool::APE::Composite = (
    GROUPS => { 2 => 'Audio' },
    Duration => {
        Require => {
            0 => 'APE:SampleRate',
            1 => 'APE:TotalFrames',
            2 => 'APE:BlocksPerFrame',
            3 => 'APE:FinalFrameBlocks',
        },
        RawConv => '($val[0] && $val[1]) ? (($val[1] - 1) * $val[2] + $val[3]) / $val[0]: undef',
        PrintConv => 'ConvertDuration($val)',
    },
);

# add our composite tags
Image::ExifTool::AddCompositeTags('Image::ExifTool::APE');

#------------------------------------------------------------------------------
# Make tag info hash for specified tag
# Inputs: 0) tag name, 1) tag table ref
# - must only call if tag doesn't exist
sub MakeTag($$)
{
    my ($tag, $tagTablePtr) = @_;
    my $name = ucfirst(lc($tag));
    # remove invalid characters in tag name and capitalize following letters
    $name =~ s/[^\w-]+(.?)/\U$1/sg;
    $name =~ s/([a-z0-9])_([a-z])/$1\U$2/g;
    my %tagInfo = ( Name => $name );
    $tagInfo{Groups} = { 2 => 'Preview' } if $tag =~ /^Cover Art/ and $tag !~ /Desc$/;
    AddTagToTable($tagTablePtr, $tag, \%tagInfo);
}

#------------------------------------------------------------------------------
# Extract information from an APE file
# Inputs: 0) ExifTool object reference, 1) dirInfo reference
# - Just looks for APE trailer if FileType is already set
# Returns: 1 on success, 0 if this wasn't a valid APE file
sub ProcessAPE($$)
{
    my ($et, $dirInfo) = @_;

    # must first check for leading/trailing ID3 information
    unless ($$et{DoneID3}) {
        require Image::ExifTool::ID3;
        Image::ExifTool::ID3::ProcessID3($et, $dirInfo) and return 1;
    }
    my $raf = $$dirInfo{RAF};
    my $verbose = $et->Options('Verbose');
    my ($buff, $i, $header, $tagTablePtr, $dataPos, $oldIndent);

    $$et{DoneAPE} = 1;

    # check APE signature and process audio information
    # unless this is some other type of file
    unless ($$et{VALUE}{FileType}) {
        $raf->Read($buff, 32) == 32 or return 0;
        $buff =~ /^(MAC |APETAGEX)/ or return 0;
        $et->SetFileType();
        SetByteOrder('II');

        if ($buff =~ /^APETAGEX/) {
            # we already read the APE header
            $header = 1;
        } else {
            # process the MAC header
            my $vers = Get16u(\$buff, 4);
            my $table;
            if ($vers <= 3970) {
                $buff = substr($buff, 4);
                $table = GetTagTable('Image::ExifTool::APE::OldHeader');
            } else {
                my $dlen = Get32u(\$buff, 8);
                my $hlen = Get32u(\$buff, 12);
                unless ($dlen & 0x80000000 or $hlen & 0x80000000) {
                    if ($raf->Seek($dlen, 0) and $raf->Read($buff, $hlen) == $hlen) {
                        $table = GetTagTable('Image::ExifTool::APE::NewHeader');
                    }
                }
            }
            $et->ProcessDirectory( { DataPt => \$buff }, $table) if $table;
        }
    }
    # look for APE trailer unless we already found an APE header
    unless ($header) {
        # look for the APE trailer footer...
        my $footPos = -32;
        # (...but before the ID3v1 trailer if it exists)
        $footPos -= $$et{DoneID3} if $$et{DoneID3} > 1;
        $raf->Seek($footPos, 2)     or return 1;
        $raf->Read($buff, 32) == 32 or return 1;
        $buff =~ /^APETAGEX/        or return 1;
        SetByteOrder('II');
    }
#
# Read the APE data (we have just read the APE header or footer into $buff)
#
    my ($version, $size, $count, $flags) = unpack('x8V4', $buff);
    $version /= 1000;
    $size -= 32;    # get size of data only
    if (($size & 0x80000000) == 0 and
        ($header or $raf->Seek(-$size-32, 1)) and
        $raf->Read($buff, $size) == $size)
    {
        if ($verbose) {
            $oldIndent = $$et{INDENT};
            $$et{INDENT} .= '| ';
            $et->VerboseDir("APEv$version", $count, $size);
            $et->VerboseDump(\$buff, DataPos => $raf->Tell() - $size);
        }
        $tagTablePtr = GetTagTable('Image::ExifTool::APE::Main');
        $dataPos = $raf->Tell() - $size;
    } else {
        $count = -1;
    }
#
# Process the APE tags
#
    my $pos = 0;
    for ($i=0; $i<$count; ++$i) {
        # read next APE tag
        last if $pos + 8 > $size;
        my $len = Get32u(\$buff, $pos);
        my $flags = Get32u(\$buff, $pos + 4);
        pos($buff) = $pos + 8;
        last unless $buff =~ /\G(.*?)\0/sg;
        my $tag = $1;
        # avoid conflicts with our special table entries
        $tag .= '.' if $Image::ExifTool::specialTags{$tag};
        $pos = pos($buff);
        last if $pos + $len > $size;
        my $val = substr($buff, $pos, $len);
        MakeTag($tag, $tagTablePtr) unless $$tagTablePtr{$tag};
        # handle binary-value tags
        if (($flags & 0x06) == 0x02) {
            my $buf2 = $val;
            $val = \$buf2;
            # extract cover art description separately (hackitty hack)
            if ($tag =~ /^Cover Art/) {
                $buf2 =~ s/^([\x20-\x7f]*)\0//;
                if ($1) {
                    my $t = "$tag Desc";
                    my $v = $1;
                    MakeTag($t, $tagTablePtr) unless $$tagTablePtr{$t};
                    $et->HandleTag($tagTablePtr, $t, $v);
                }
            }
        }
        $et->HandleTag($tagTablePtr, $tag, $val,
            Index => $i,
            DataPt => \$buff,
            DataPos => $dataPos,
            Start => $pos,
            Size => $len,
        );
        $pos += $len;
    }
    $i == $count or $et->Warn('Bad APE trailer');
    $$et{INDENT} = $oldIndent if defined $oldIndent;
    return 1;
}

1;  # end

__END__