239 lines
7.6 KiB
Perl
239 lines
7.6 KiB
Perl
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#------------------------------------------------------------------------------
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# File: Vorbis.pm
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#
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# Description: Read Ogg Vorbis audio meta information
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#
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# Revisions: 2006/11/10 - P. Harvey Created
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# 2011/07/12 - PH Moved Ogg to a separate module and added Theora
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#
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# References: 1) http://www.xiph.org/vorbis/doc/
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# 2) http://flac.sourceforge.net/ogg_mapping.html
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# 3) http://www.theora.org/doc/Theora.pdf
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#------------------------------------------------------------------------------
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package Image::ExifTool::Vorbis;
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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 = '1.08';
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sub ProcessComments($$$);
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# Vorbis header types
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%Image::ExifTool::Vorbis::Main = (
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NOTES => q{
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Information extracted from Ogg Vorbis files. See
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L<http://www.xiph.org/vorbis/doc/> for the Vorbis specification.
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},
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1 => {
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Name => 'Identification',
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SubDirectory => { TagTable => 'Image::ExifTool::Vorbis::Identification' },
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},
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3 => {
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Name => 'Comments',
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SubDirectory => { TagTable => 'Image::ExifTool::Vorbis::Comments' },
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},
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);
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%Image::ExifTool::Vorbis::Identification = (
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PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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GROUPS => { 2 => 'Audio' },
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0 => {
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Name => 'VorbisVersion',
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Format => 'int32u',
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},
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4 => 'AudioChannels',
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5 => {
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Name => 'SampleRate',
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Format => 'int32u',
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},
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9 => {
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Name => 'MaximumBitrate',
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Format => 'int32u',
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RawConv => '$val || undef',
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PrintConv => 'ConvertBitrate($val)',
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},
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13 => {
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Name => 'NominalBitrate',
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Format => 'int32u',
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RawConv => '$val || undef',
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PrintConv => 'ConvertBitrate($val)',
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},
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17 => {
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Name => 'MinimumBitrate',
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Format => 'int32u',
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RawConv => '$val || undef',
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PrintConv => 'ConvertBitrate($val)',
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},
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);
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%Image::ExifTool::Vorbis::Comments = (
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PROCESS_PROC => \&ProcessComments,
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GROUPS => { 2 => 'Audio' },
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NOTES => q{
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The tags below are only some common tags found in the Vorbis comments of Ogg
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Vorbis and Ogg FLAC audio files, however ExifTool will extract values from
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any tag found, even if not listed here.
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},
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vendor => { Notes => 'from comment header' },
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TITLE => { Name => 'Title' },
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VERSION => { Name => 'Version' },
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ALBUM => { Name => 'Album' },
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TRACKNUMBER=>{ Name => 'TrackNumber' },
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ARTIST => { Name => 'Artist', Groups => { 2 => 'Author' }, List => 1 },
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PERFORMER => { Name => 'Performer', Groups => { 2 => 'Author' }, List => 1 },
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COPYRIGHT => { Name => 'Copyright', Groups => { 2 => 'Author' } },
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LICENSE => { Name => 'License', Groups => { 2 => 'Author' } },
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ORGANIZATION=>{Name => 'Organization', Groups => { 2 => 'Author' } },
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DESCRIPTION=>{ Name => 'Description' },
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GENRE => { Name => 'Genre' },
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DATE => { Name => 'Date', Groups => { 2 => 'Time' } },
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LOCATION => { Name => 'Location', Groups => { 2 => 'Location' } },
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CONTACT => { Name => 'Contact', Groups => { 2 => 'Author' }, List => 1 },
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ISRC => { Name => 'ISRCNumber' },
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COVERARTMIME => { Name => 'CoverArtMIMEType' },
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COVERART => {
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Name => 'CoverArt',
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Groups => { 2 => 'Preview' },
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Notes => 'base64-encoded image',
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ValueConv => q{
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require Image::ExifTool::XMP;
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Image::ExifTool::XMP::DecodeBase64($val);
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},
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},
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REPLAYGAIN_TRACK_PEAK => { Name => 'ReplayGainTrackPeak' },
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REPLAYGAIN_TRACK_GAIN => { Name => 'ReplayGainTrackGain' },
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REPLAYGAIN_ALBUM_PEAK => { Name => 'ReplayGainAlbumPeak' },
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REPLAYGAIN_ALBUM_GAIN => { Name => 'ReplayGainAlbumGain' },
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# observed in "Xiph.Org libVorbis I 20020717" ogg:
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ENCODED_USING => { Name => 'EncodedUsing' },
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ENCODED_BY => { Name => 'EncodedBy' },
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COMMENT => { Name => 'Comment' },
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# in Theora documentation (ref 3)
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DIRECTOR => { Name => 'Director' },
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PRODUCER => { Name => 'Producer' },
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COMPOSER => { Name => 'Composer' },
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ACTOR => { Name => 'Actor' },
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);
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# Vorbis composite tags
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%Image::ExifTool::Vorbis::Composite = (
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Duration => {
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Require => {
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0 => 'Vorbis:NominalBitrate',
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1 => 'FileSize',
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},
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RawConv => '$val[0] ? $val[1] * 8 / $val[0] : undef',
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PrintConv => 'ConvertDuration($val) . " (approx)"', # (only approximate)
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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::Vorbis');
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#------------------------------------------------------------------------------
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# Process Vorbis Comments
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# Inputs: 0) ExifTool object ref, 1) dirInfo ref, 2) tag table ref
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# Returns: 1 on success, otherwise returns 0 and sets a Warning
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sub ProcessComments($$$)
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{
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my ($et, $dirInfo, $tagTablePtr) = @_;
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my $dataPt = $$dirInfo{DataPt};
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my $dataPos = $$dirInfo{DataPos};
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my $pos = $$dirInfo{DirStart} || 0;
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my $end = $$dirInfo{DirLen} ? $pos + $$dirInfo{DirLen} : length $$dataPt;
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my ($num, $index);
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SetByteOrder('II');
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for (;;) {
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last if $pos + 4 > $end;
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my $len = Get32u($dataPt, $pos);
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last if $pos + 4 + $len > $end;
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my $start = $pos + 4;
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my $buff = substr($$dataPt, $start, $len);
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$pos = $start + $len;
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my ($tag, $val);
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if (defined $num) {
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$buff =~ /(.*?)=(.*)/s or last;
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($tag, $val) = ($1, $2);
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# Vorbis tag ID's are all capitals, so they may conflict with our internal tags
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# --> protect against this by adding a trailing underline if necessary
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$tag .= '_' if $Image::ExifTool::specialTags{$tag};
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} else {
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$tag = 'vendor';
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$val = $buff;
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$num = ($pos + 4 < $end) ? Get32u($dataPt, $pos) : 0;
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$et->VPrint(0, " + [Vorbis comments with $num entries]\n");
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$pos += 4;
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}
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# add tag to table unless it exists already
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unless ($$tagTablePtr{$tag}) {
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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$2/g;
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AddTagToTable($tagTablePtr, $tag, { Name => $name });
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}
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$et->HandleTag($tagTablePtr, $tag, $et->Decode($val, 'UTF8'),
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Index => $index,
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DataPt => $dataPt,
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DataPos => $dataPos,
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Start => $start,
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Size => $len,
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);
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# all done if this was our last tag
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$num-- or return 1;
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$index = (defined $index) ? $index + 1 : 0;
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}
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$et->Warn('Format error in Vorbis comments');
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return 0;
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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::Vorbis - Read Ogg Vorbis 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 Ogg Vorbis audio headers.
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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.xiph.org/vorbis/doc/>
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=item L<http://flac.sourceforge.net/ogg_mapping.html>
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=item L<http://www.theora.org/doc/Theora.pdf>
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=back
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=head1 SEE ALSO
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L<Image::ExifTool::TagNames/Vorbis Tags>,
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L<Image::ExifTool::TagNames/Ogg Tags>,
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L<Image::ExifTool(3pm)|Image::ExifTool>
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=cut
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