298 lines
9.0 KiB
Perl
298 lines
9.0 KiB
Perl
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#------------------------------------------------------------------------------
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# File: AIFF.pm
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#
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# Description: Read AIFF meta information
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#
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# Revisions: 01/06/2006 - P. Harvey Created
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# 09/22/2008 - PH Added DjVu support
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#
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# References: 1) http://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.30.htm#pgfId=3190
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# 2) http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/
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# 3) http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/
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#------------------------------------------------------------------------------
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package Image::ExifTool::AIFF;
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use strict;
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use vars qw($VERSION);
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use Image::ExifTool qw(:DataAccess :Utils);
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use Image::ExifTool::ID3;
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$VERSION = '1.09';
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# information for time/date-based tags (time zero is Jan 1, 1904)
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my %timeInfo = (
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Groups => { 2 => 'Time' },
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ValueConv => 'ConvertUnixTime($val - ((66 * 365 + 17) * 24 * 3600))',
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PrintConv => '$self->ConvertDateTime($val)',
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);
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# AIFF info
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%Image::ExifTool::AIFF::Main = (
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GROUPS => { 2 => 'Audio' },
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NOTES => q{
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Tags extracted from Audio Interchange File Format (AIFF) files. See
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L<http://www-mmsp.ece.mcgill.ca/Documents/AudioFormats/AIFF/AIFF.html> for
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the AIFF specification.
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},
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# FORM => 'Format',
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FVER => {
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Name => 'FormatVersion',
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SubDirectory => { TagTable => 'Image::ExifTool::AIFF::FormatVers' },
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},
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COMM => {
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Name => 'Common',
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SubDirectory => { TagTable => 'Image::ExifTool::AIFF::Common' },
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},
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COMT => {
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Name => 'Comment',
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SubDirectory => { TagTable => 'Image::ExifTool::AIFF::Comment' },
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},
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NAME => {
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Name => 'Name',
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ValueConv => '$self->Decode($val, "MacRoman")',
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},
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AUTH => {
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Name => 'Author',
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Groups => { 2 => 'Author' },
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ValueConv => '$self->Decode($val, "MacRoman")',
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},
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'(c) ' => {
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Name => 'Copyright',
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Groups => { 2 => 'Author' },
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ValueConv => '$self->Decode($val, "MacRoman")',
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},
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ANNO => {
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Name => 'Annotation',
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ValueConv => '$self->Decode($val, "MacRoman")',
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},
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'ID3 ' => {
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Name => 'ID3',
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SubDirectory => {
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TagTable => 'Image::ExifTool::ID3::Main',
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ProcessProc => \&Image::ExifTool::ID3::ProcessID3,
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},
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},
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# SSND => 'SoundData',
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# MARK => 'Marker',
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# INST => 'Instrument',
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# MIDI => 'MidiData',
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# AESD => 'AudioRecording',
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# APPL => 'ApplicationSpecific',
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);
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%Image::ExifTool::AIFF::Common = (
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PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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GROUPS => { 2 => 'Audio' },
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FORMAT => 'int16u',
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0 => 'NumChannels',
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1 => { Name => 'NumSampleFrames', Format => 'int32u' },
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3 => 'SampleSize',
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4 => { Name => 'SampleRate', Format => 'extended' }, #3
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9 => {
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Name => 'CompressionType',
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Format => 'string[4]',
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PrintConv => {
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NONE => 'None',
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ACE2 => 'ACE 2-to-1',
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ACE8 => 'ACE 8-to-3',
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MAC3 => 'MAC 3-to-1',
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MAC6 => 'MAC 6-to-1',
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sowt => 'Little-endian, no compression',
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alaw => 'a-law',
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ALAW => 'A-law',
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ulaw => 'mu-law',
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ULAW => 'Mu-law',
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'GSM '=> 'GSM',
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G722 => 'G722',
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G726 => 'G726',
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G728 => 'G728',
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},
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},
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11 => { #PH
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Name => 'CompressorName',
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Format => 'pstring',
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ValueConv => '$self->Decode($val, "MacRoman")',
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},
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);
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%Image::ExifTool::AIFF::FormatVers = (
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PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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FORMAT => 'int32u',
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0 => { Name => 'FormatVersionTime', %timeInfo },
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);
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%Image::ExifTool::AIFF::Comment = (
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PROCESS_PROC => \&Image::ExifTool::AIFF::ProcessComment,
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GROUPS => { 2 => 'Audio' },
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0 => { Name => 'CommentTime', %timeInfo },
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1 => 'MarkerID',
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2 => {
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Name => 'Comment',
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ValueConv => '$self->Decode($val, "MacRoman")',
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},
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);
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%Image::ExifTool::AIFF::Composite = (
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Duration => {
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Require => {
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0 => 'AIFF:SampleRate',
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1 => 'AIFF:NumSampleFrames',
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},
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RawConv => '($val[0] and $val[1]) ? $val[1] / $val[0] : undef',
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PrintConv => 'ConvertDuration($val)',
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},
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);
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# add our composite tags
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Image::ExifTool::AddCompositeTags('Image::ExifTool::AIFF');
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#------------------------------------------------------------------------------
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# Process AIFF Comment chunk
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# Inputs: 0) ExifTool object reference, 1) DirInfo reference, 2) tag table ref
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# Returns: 1 on success
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sub ProcessComment($$$)
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{
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my ($et, $dirInfo, $tagTablePtr) = @_;
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my $dataPt = $$dirInfo{DataPt};
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my $dirLen = $$dirInfo{DirLen};
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my $verbose = $et->Options('Verbose');
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return 0 unless $dirLen > 2;
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my $numComments = unpack('n',$$dataPt);
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my $pos = 2;
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my $i;
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$verbose and $et->VerboseDir('Comment', $numComments);
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for ($i=0; $i<$numComments; ++$i) {
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last if $pos + 8 > $dirLen;
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my ($time, $markerID, $size) = unpack("x${pos}Nnn", $$dataPt);
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$et->HandleTag($tagTablePtr, 0, $time);
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$et->HandleTag($tagTablePtr, 1, $markerID) if $markerID;
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$pos += 8;
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last if $pos + $size > $dirLen;
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my $val = substr($$dataPt, $pos, $size);
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$et->HandleTag($tagTablePtr, 2, $val);
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++$size if $size & 0x01; # account for padding byte if necessary
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$pos += $size;
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}
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}
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#------------------------------------------------------------------------------
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# Extract information from a AIFF file
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# Inputs: 0) ExifTool object reference, 1) DirInfo reference
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# Returns: 1 on success, 0 if this wasn't a valid AIFF file
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sub ProcessAIFF($$)
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{
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my ($et, $dirInfo) = @_;
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my $raf = $$dirInfo{RAF};
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my ($buff, $err, $tagTablePtr, $page, $type);
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# verify this is a valid AIFF file
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return 0 unless $raf->Read($buff, 12) == 12;
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my $fast3 = $$et{OPTIONS}{FastScan} && $$et{OPTIONS}{FastScan} == 3;
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my $pos = 12;
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# check for DjVu image
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if ($buff =~ /^AT&TFORM/) {
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# http://www.djvu.org/
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# http://djvu.sourceforge.net/specs/djvu3changes.txt
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my $buf2;
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return 0 unless $raf->Read($buf2, 4) == 4 and $buf2 =~ /^(DJVU|DJVM)/;
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$pos += 4;
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$buff = substr($buff, 4) . $buf2;
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$et->SetFileType('DJVU');
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return 1 if $fast3;
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$tagTablePtr = GetTagTable('Image::ExifTool::DjVu::Main');
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# modifiy FileType to indicate a multi-page document
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$$et{VALUE}{FileType} .= " (multi-page)" if $buf2 eq 'DJVM';
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$type = 'DjVu';
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} else {
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return 0 unless $buff =~ /^FORM....(AIF(F|C))/s;
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$et->SetFileType($1);
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return 1 if $fast3;
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$tagTablePtr = GetTagTable('Image::ExifTool::AIFF::Main');
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$type = 'AIFF';
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}
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SetByteOrder('MM');
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my $verbose = $et->Options('Verbose');
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#
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# Read through the IFF chunks
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#
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for (;;) {
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$raf->Read($buff, 8) == 8 or last;
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$pos += 8;
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my ($tag, $len) = unpack('a4N', $buff);
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my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
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$et->VPrint(0, "AIFF '${tag}' chunk ($len bytes of data):\n");
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# AIFF chunks are padded to an even number of bytes
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my $len2 = $len + ($len & 0x01);
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if ($tagInfo) {
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if ($$tagInfo{TypeOnly}) {
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$len = $len2 = 4;
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$page = ($page || 0) + 1;
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$et->VPrint(0, $$et{INDENT} . "Page $page:\n");
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}
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$raf->Read($buff, $len2) >= $len or $err=1, last;
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unless ($$tagInfo{SubDirectory} or $$tagInfo{Binary}) {
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$buff =~ s/\0+$//; # remove trailing nulls
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}
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$et->HandleTag($tagTablePtr, $tag, $buff,
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DataPt => \$buff,
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DataPos => $pos,
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Start => 0,
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Size => $len,
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);
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} elsif ($verbose > 2 and $len2 < 1024000) {
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$raf->Read($buff, $len2) == $len2 or $err = 1, last;
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$et->VerboseDump(\$buff);
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} else {
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$raf->Seek($len2, 1) or $err=1, last;
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}
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$pos += $len2;
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}
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$err and $et->Warn("Error reading $type file (corrupted?)");
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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::AIFF - Read AIFF 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 routines required by Image::ExifTool to extract
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information from AIFF (Audio Interchange File Format) audio files.
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=head1 AUTHOR
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Copyright 2003-2018, 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://developer.apple.com/documentation/QuickTime/INMAC/SOUND/imsoundmgr.30.htm#pgfId=3190>
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=item L<http://astronomy.swin.edu.au/~pbourke/dataformats/aiff/>
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=item L<http://www.mactech.com/articles/mactech/Vol.06/06.01/SANENormalized/>
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=back
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=head1 SEE ALSO
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|
|
|
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|
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L<Image::ExifTool::TagNames/AIFF Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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