265 lines
8.3 KiB
Perl
265 lines
8.3 KiB
Perl
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#------------------------------------------------------------------------------
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# File: APE.pm
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#
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# Description: Read Monkey's Audio meta information
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#
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# Revisions: 11/13/2006 - P. Harvey Created
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#
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# References: 1) http://www.monkeysaudio.com/
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# 2) http://www.personal.uni-jena.de/~pfk/mpp/sv8/apetag.html
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#------------------------------------------------------------------------------
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package Image::ExifTool::APE;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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$VERSION = '1.04';
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# APE metadata blocks
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%Image::ExifTool::APE::Main = (
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GROUPS => { 2 => 'Audio' },
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NOTES => q{
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Tags found in Monkey's Audio (APE) information. Only a few common tags are
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listed below, but ExifTool will extract any tag found. ExifTool supports
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APEv1 and APEv2 tags, as well as ID3 information in APE files, and will also
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read APE metadata from MP3 and MPC files.
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},
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Album => { },
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Artist => { },
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Genre => { },
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Title => { },
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Track => { },
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Year => { },
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'Tool Version' => { Name => 'ToolVersion' },
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'Tool Name' => { Name => 'ToolName' },
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);
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# APE MAC header version 3.97 or earlier
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%Image::ExifTool::APE::OldHeader = (
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PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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GROUPS => { 1 => 'MAC', 2 => 'Audio' },
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FORMAT => 'int16u',
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NOTES => 'APE MAC audio header for version 3.97 or earlier.',
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0 => {
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Name => 'APEVersion',
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ValueConv => '$val / 1000',
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},
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1 => 'CompressionLevel',
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# 2 => 'FormatFlags',
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3 => 'Channels',
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4 => { Name => 'SampleRate', Format => 'int32u' },
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# 6 => { Name => 'HeaderBytes', Format => 'int32u' }, # WAV header bytes
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# 8 => { Name => 'TerminatingBytes', Format => 'int32u' },
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10 => { Name => 'TotalFrames', Format => 'int32u' },
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12 => { Name => 'FinalFrameBlocks', Format => 'int32u' },
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);
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# APE MAC header version 3.98 or later
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%Image::ExifTool::APE::NewHeader = (
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PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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GROUPS => { 1 => 'MAC', 2 => 'Audio' },
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FORMAT => 'int16u',
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NOTES => 'APE MAC audio header for version 3.98 or later.',
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0 => 'CompressionLevel',
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# 1 => 'FormatFlags',
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2 => { Name => 'BlocksPerFrame', Format => 'int32u' },
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4 => { Name => 'FinalFrameBlocks', Format => 'int32u' },
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6 => { Name => 'TotalFrames', Format => 'int32u' },
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8 => 'BitsPerSample',
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9 => 'Channels',
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10 => { Name => 'SampleRate', Format => 'int32u' },
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);
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#------------------------------------------------------------------------------
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# Make tag info hash for specified tag
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# Inputs: 0) tag name, 1) tag table ref
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# - must only call if tag doesn't exist
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sub MakeTag($$)
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{
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my ($tag, $tagTablePtr) = @_;
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my $name = ucfirst(lc($tag));
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# remove invalid characters in tag name and capitalize following letters
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$name =~ s/[^\w-]+(.?)/\U$1/sg;
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$name =~ s/([a-z0-9])_([a-z])/$1\U$2/g;
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my %tagInfo = ( Name => $name );
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$tagInfo{Groups} = { 2 => 'Preview' } if $tag =~ /^Cover Art/ and $tag !~ /Desc$/;
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AddTagToTable($tagTablePtr, $tag, \%tagInfo);
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}
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#------------------------------------------------------------------------------
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# Extract information from an APE file
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# Inputs: 0) ExifTool object reference, 1) dirInfo reference
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# - Just looks for APE trailer if FileType is already set
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# Returns: 1 on success, 0 if this wasn't a valid APE file
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sub ProcessAPE($$)
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{
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my ($et, $dirInfo) = @_;
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# must first check for leading/trailing ID3 information
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unless ($$et{DoneID3}) {
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require Image::ExifTool::ID3;
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Image::ExifTool::ID3::ProcessID3($et, $dirInfo) and return 1;
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}
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my $raf = $$dirInfo{RAF};
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my $verbose = $et->Options('Verbose');
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my ($buff, $i, $header, $tagTablePtr, $dataPos, $oldIndent);
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$$et{DoneAPE} = 1;
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# check APE signature and process audio information
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# unless this is some other type of file
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unless ($$et{VALUE}{FileType}) {
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$raf->Read($buff, 32) == 32 or return 0;
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$buff =~ /^(MAC |APETAGEX)/ or return 0;
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$et->SetFileType();
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SetByteOrder('II');
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if ($buff =~ /^APETAGEX/) {
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# we already read the APE header
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$header = 1;
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} else {
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# process the MAC header
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my $vers = Get16u(\$buff, 4);
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my $table;
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if ($vers <= 3970) {
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$buff = substr($buff, 4);
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$table = GetTagTable('Image::ExifTool::APE::OldHeader');
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} else {
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my $dlen = Get32u(\$buff, 8);
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my $hlen = Get32u(\$buff, 12);
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unless ($dlen & 0x80000000 or $hlen & 0x80000000) {
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if ($raf->Seek($dlen, 0) and $raf->Read($buff, $hlen) == $hlen) {
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$table = GetTagTable('Image::ExifTool::APE::NewHeader');
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}
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}
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}
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$et->ProcessDirectory( { DataPt => \$buff }, $table) if $table;
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}
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}
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# look for APE trailer unless we already found an APE header
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unless ($header) {
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# look for the APE trailer footer...
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my $footPos = -32;
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# (...but before the ID3v1 trailer if it exists)
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$footPos -= 128 if $$et{DoneID3} == 2;
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$raf->Seek($footPos, 2) or return 1;
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$raf->Read($buff, 32) == 32 or return 1;
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$buff =~ /^APETAGEX/ or return 1;
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SetByteOrder('II');
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}
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#
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# Read the APE data (we have just read the APE header or footer into $buff)
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#
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my ($version, $size, $count, $flags) = unpack('x8V4', $buff);
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$version /= 1000;
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$size -= 32; # get size of data only
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if (($size & 0x80000000) == 0 and
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($header or $raf->Seek(-$size-32, 1)) and
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$raf->Read($buff, $size) == $size)
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{
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if ($verbose) {
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$oldIndent = $$et{INDENT};
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$$et{INDENT} .= '| ';
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$et->VerboseDir("APEv$version", $count, $size);
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$et->VerboseDump(\$buff, DataPos => $raf->Tell() - $size);
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}
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$tagTablePtr = GetTagTable('Image::ExifTool::APE::Main');
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$dataPos = $raf->Tell() - $size;
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} else {
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$count = -1;
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}
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#
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# Process the APE tags
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#
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my $pos = 0;
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for ($i=0; $i<$count; ++$i) {
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# read next APE tag
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last if $pos + 8 > $size;
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my $len = Get32u(\$buff, $pos);
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my $flags = Get32u(\$buff, $pos + 4);
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pos($buff) = $pos + 8;
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last unless $buff =~ /\G(.*?)\0/sg;
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my $tag = $1;
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# avoid conflicts with our special table entries
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$tag .= '.' if $Image::ExifTool::specialTags{$tag};
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$pos = pos($buff);
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last if $pos + $len > $size;
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my $val = substr($buff, $pos, $len);
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MakeTag($tag, $tagTablePtr) unless $$tagTablePtr{$tag};
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# handle binary-value tags
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if (($flags & 0x06) == 0x02) {
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my $buf2 = $val;
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$val = \$buf2;
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# extract cover art description separately (hackitty hack)
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if ($tag =~ /^Cover Art/) {
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$buf2 =~ s/^([\x20-\x7f]*)\0//;
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if ($1) {
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my $t = "$tag Desc";
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my $v = $1;
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MakeTag($t, $tagTablePtr) unless $$tagTablePtr{$t};
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$et->HandleTag($tagTablePtr, $t, $v);
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}
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}
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}
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$et->HandleTag($tagTablePtr, $tag, $val,
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Index => $i,
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DataPt => \$buff,
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DataPos => $dataPos,
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Start => $pos,
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Size => $len,
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);
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$pos += $len;
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}
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$i == $count or $et->Warn('Bad APE trailer');
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$$et{INDENT} = $oldIndent if defined $oldIndent;
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return 1;
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}
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1; # end
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__END__
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=head1 NAME
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Image::ExifTool::APE - Read Monkey's Audio meta information
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=head1 SYNOPSIS
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This module is used by Image::ExifTool
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=head1 DESCRIPTION
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This module contains definitions required by Image::ExifTool to extract meta
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information from Monkey's Audio (APE) audio files.
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=head1 BUGS
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Currently doesn't parse MAC header unless it is at the start of the file.
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=head1 AUTHOR
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Copyright 2003-2016, Phil Harvey (phil at owl.phy.queensu.ca)
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This library is free software; you can redistribute it and/or modify it
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under the same terms as Perl itself.
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=head1 REFERENCES
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=over 4
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=item L<http://www.monkeysaudio.com/>
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=item L<http://www.personal.uni-jena.de/~pfk/mpp/sv8/apetag.html>
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=back
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=head1 SEE ALSO
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L<Image::ExifTool::TagNames/APE Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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