#------------------------------------------------------------------------------ # File: AIFF.pm # # Description: Read AIFF meta information # # Revisions: 01/06/2006 - P. Harvey Created # 09/22/2008 - PH Added DjVu support # # References: 1) http://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.30.htm#pgfId=3190 # 2) http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/ # 3) http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/ #------------------------------------------------------------------------------ package Image::ExifTool::AIFF; use strict; use vars qw($VERSION); use Image::ExifTool qw(:DataAccess :Utils); use Image::ExifTool::ID3; $VERSION = '1.11'; # information for time/date-based tags (time zero is Jan 1, 1904) my %timeInfo = ( Groups => { 2 => 'Time' }, ValueConv => 'ConvertUnixTime($val - ((66 * 365 + 17) * 24 * 3600))', PrintConv => '$self->ConvertDateTime($val)', ); # AIFF info %Image::ExifTool::AIFF::Main = ( GROUPS => { 2 => 'Audio' }, NOTES => q{ Tags extracted from Audio Interchange File Format (AIFF) files. See L for the AIFF specification. }, # FORM => 'Format', FVER => { Name => 'FormatVersion', SubDirectory => { TagTable => 'Image::ExifTool::AIFF::FormatVers' }, }, COMM => { Name => 'Common', SubDirectory => { TagTable => 'Image::ExifTool::AIFF::Common' }, }, COMT => { Name => 'Comment', SubDirectory => { TagTable => 'Image::ExifTool::AIFF::Comment' }, }, NAME => { Name => 'Name', ValueConv => '$self->Decode($val, "MacRoman")', }, AUTH => { Name => 'Author', Groups => { 2 => 'Author' }, ValueConv => '$self->Decode($val, "MacRoman")', }, '(c) ' => { Name => 'Copyright', Groups => { 2 => 'Author' }, ValueConv => '$self->Decode($val, "MacRoman")', }, ANNO => { Name => 'Annotation', ValueConv => '$self->Decode($val, "MacRoman")', }, 'ID3 ' => { Name => 'ID3', SubDirectory => { TagTable => 'Image::ExifTool::ID3::Main', ProcessProc => \&Image::ExifTool::ID3::ProcessID3, }, }, APPL => 'ApplicationData', # (first 4 bytes are the application signature) # SSND => 'SoundData', # MARK => 'Marker', # INST => 'Instrument', # MIDI => 'MidiData', # AESD => 'AudioRecording', ); %Image::ExifTool::AIFF::Common = ( PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData, GROUPS => { 2 => 'Audio' }, FORMAT => 'int16u', 0 => 'NumChannels', 1 => { Name => 'NumSampleFrames', Format => 'int32u' }, 3 => 'SampleSize', 4 => { Name => 'SampleRate', Format => 'extended' }, #3 9 => { Name => 'CompressionType', Format => 'string[4]', PrintConv => { NONE => 'None', ACE2 => 'ACE 2-to-1', ACE8 => 'ACE 8-to-3', MAC3 => 'MAC 3-to-1', MAC6 => 'MAC 6-to-1', sowt => 'Little-endian, no compression', alaw => 'a-law', ALAW => 'A-law', ulaw => 'mu-law', ULAW => 'Mu-law', 'GSM '=> 'GSM', G722 => 'G722', G726 => 'G726', G728 => 'G728', }, }, 11 => { #PH Name => 'CompressorName', Format => 'pstring', ValueConv => '$self->Decode($val, "MacRoman")', }, ); %Image::ExifTool::AIFF::FormatVers = ( PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData, FORMAT => 'int32u', 0 => { Name => 'FormatVersionTime', %timeInfo }, ); %Image::ExifTool::AIFF::Comment = ( PROCESS_PROC => \&Image::ExifTool::AIFF::ProcessComment, GROUPS => { 2 => 'Audio' }, 0 => { Name => 'CommentTime', %timeInfo }, 1 => 'MarkerID', 2 => { Name => 'Comment', ValueConv => '$self->Decode($val, "MacRoman")', }, ); %Image::ExifTool::AIFF::Composite = ( Duration => { Require => { 0 => 'AIFF:SampleRate', 1 => 'AIFF:NumSampleFrames', }, RawConv => '($val[0] and $val[1]) ? $val[1] / $val[0] : undef', PrintConv => 'ConvertDuration($val)', }, ); # add our composite tags Image::ExifTool::AddCompositeTags('Image::ExifTool::AIFF'); #------------------------------------------------------------------------------ # Process AIFF Comment chunk # Inputs: 0) ExifTool object reference, 1) DirInfo reference, 2) tag table ref # Returns: 1 on success sub ProcessComment($$$) { my ($et, $dirInfo, $tagTablePtr) = @_; my $dataPt = $$dirInfo{DataPt}; my $dirLen = $$dirInfo{DirLen}; my $verbose = $et->Options('Verbose'); return 0 unless $dirLen > 2; my $numComments = unpack('n',$$dataPt); my $pos = 2; my $i; $verbose and $et->VerboseDir('Comment', $numComments); for ($i=0; $i<$numComments; ++$i) { last if $pos + 8 > $dirLen; my ($time, $markerID, $size) = unpack("x${pos}Nnn", $$dataPt); $et->HandleTag($tagTablePtr, 0, $time); $et->HandleTag($tagTablePtr, 1, $markerID) if $markerID; $pos += 8; last if $pos + $size > $dirLen; my $val = substr($$dataPt, $pos, $size); $et->HandleTag($tagTablePtr, 2, $val); ++$size if $size & 0x01; # account for padding byte if necessary $pos += $size; } } #------------------------------------------------------------------------------ # Extract information from a AIFF file # Inputs: 0) ExifTool object reference, 1) DirInfo reference # Returns: 1 on success, 0 if this wasn't a valid AIFF file sub ProcessAIFF($$) { my ($et, $dirInfo) = @_; my $raf = $$dirInfo{RAF}; my ($buff, $err, $tagTablePtr, $page, $type, $n); # verify this is a valid AIFF file return 0 unless $raf->Read($buff, 12) == 12; my $fast3 = $$et{OPTIONS}{FastScan} && $$et{OPTIONS}{FastScan} == 3; my $pos = 12; # check for DjVu image if ($buff =~ /^AT&TFORM/) { # http://www.djvu.org/ # http://djvu.sourceforge.net/specs/djvu3changes.txt my $buf2; return 0 unless $raf->Read($buf2, 4) == 4 and $buf2 =~ /^(DJVU|DJVM)/; $pos += 4; $buff = substr($buff, 4) . $buf2; $et->SetFileType('DJVU'); return 1 if $fast3; $tagTablePtr = GetTagTable('Image::ExifTool::DjVu::Main'); # modify FileType to indicate a multi-page document $$et{VALUE}{FileType} .= " (multi-page)" if $buf2 eq 'DJVM'; $type = 'DjVu'; } else { return 0 unless $buff =~ /^FORM....(AIF(F|C))/s; $et->SetFileType($1); return 1 if $fast3; $tagTablePtr = GetTagTable('Image::ExifTool::AIFF::Main'); $type = 'AIFF'; } SetByteOrder('MM'); my $verbose = $et->Options('Verbose'); # # Read through the IFF chunks # for ($n=0;;++$n) { $raf->Read($buff, 8) == 8 or last; $pos += 8; my ($tag, $len) = unpack('a4N', $buff); my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag); $et->VPrint(0, "AIFF '${tag}' chunk ($len bytes of data): ", $raf->Tell(),"\n"); # AIFF chunks are padded to an even number of bytes my $len2 = $len + ($len & 0x01); if ($len2 > 100000000) { if ($len2 >= 0x80000000 and not $et->Options('LargeFileSupport')) { $et->Warn('End of processing at large chunk (LargeFileSupport not enabled)'); last; } if ($tagInfo) { $et->Warn("Skipping large $$tagInfo{Name} chunk (> 100 MB)"); undef $tagInfo; } } if ($tagInfo) { if ($$tagInfo{TypeOnly}) { $len = $len2 = 4; $page = ($page || 0) + 1; $et->VPrint(0, $$et{INDENT} . "Page $page:\n"); } $raf->Read($buff, $len2) >= $len or $err=1, last; unless ($$tagInfo{SubDirectory} or $$tagInfo{Binary}) { $buff =~ s/\0+$//; # remove trailing nulls } $et->HandleTag($tagTablePtr, $tag, $buff, DataPt => \$buff, DataPos => $pos, Start => 0, Size => $len, ); } elsif (not $len) { next if ++$n < 100; $et->Warn('Aborting scan. Too many empty chunks'); last; } elsif ($verbose > 2 and $len2 < 1024000) { $raf->Read($buff, $len2) == $len2 or $err = 1, last; $et->VerboseDump(\$buff); } else { $raf->Seek($len2, 1) or $err=1, last; } $pos += $len2; $n = 0; } $err and $et->Warn("Error reading $type file (corrupted?)"); return 1; } 1; # end __END__ =head1 NAME Image::ExifTool::AIFF - Read AIFF meta information =head1 SYNOPSIS This module is used by Image::ExifTool =head1 DESCRIPTION This module contains routines required by Image::ExifTool to extract information from AIFF (Audio Interchange File Format) audio files. =head1 AUTHOR Copyright 2003-2021, Phil Harvey (philharvey66 at gmail.com) This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =head1 REFERENCES =over 4 =item L =item L =item L =back =head1 SEE ALSO L, L =cut