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- #------------------------------------------------------------------------------
- # 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;
- $VERSION = '1.07';
- # information for time/date-based tags (time zero is Jan 1, 1904)
- my %timeInfo = (
- Groups => { 2 => 'Time' },
- ValueConv => 'ConvertUnixTime($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<http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/AIFF/AIFF.html> 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,
- },
- },
- # SSND => 'SoundData',
- # MARK => 'Marker',
- # INST => 'Instrument',
- # MIDI => 'MidiData',
- # AESD => 'AudioRecording',
- # APPL => 'ApplicationSpecific',
- );
- %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',
- },
- },
- 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);
- # 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');
- # modifiy FileType to indicate a multi-page document
- $$et{VALUE}{FileType} .= " (multi-page)" if $buf2 eq 'DJVM';
- $type = 'DjVu';
- } else {
- return 0 unless $buff =~ /^FORM....(AIF(F|C))/s;
- $et->SetFileType($1);
- return 1 if $fast3;
- $tagTablePtr = GetTagTable('Image::ExifTool::AIFF::Main');
- $type = 'AIFF';
- }
- SetByteOrder('MM');
- my $verbose = $et->Options('Verbose');
- #
- # Read through the IFF chunks
- #
- for (;;) {
- $raf->Read($buff, 8) == 8 or last;
- $pos += 8;
- my ($tag, $len) = unpack('a4N', $buff);
- my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
- $et->VPrint(0, "AIFF '$tag' chunk ($len bytes of data):\n");
- # AIFF chunks are padded to an even number of bytes
- my $len2 = $len + ($len & 0x01);
- if ($tagInfo) {
- if ($$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 => $len,
- );
- } elsif ($verbose > 2 and $len2 < 1024000) {
- $raf->Read($buff, $len2) == $len2 or $err = 1, last;
- HexDump(\$buff, undef, MaxLen => 512);
- } else {
- $raf->Seek($len2, 1) or $err=1, last;
- }
- $pos += $len2;
- }
- $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 2003-2016, Phil Harvey (phil at owl.phy.queensu.ca)
- 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<http://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.30.htm#pgfId=3190>
- =item L<http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/>
- =item L<http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/>
- =back
- =head1 SEE ALSO
- L<Image::ExifTool::TagNames/AIFF Tags>,
- L<Image::ExifTool(3pm)|Image::ExifTool>
- =cut
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