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#------------------------------------------------------------------------------
# File: Theora.pm
#
# Description: Read Theora video meta information
#
# Revisions: 2011/07/13 - P. Harvey Created
#
# References: 1) http://www.theora.org/doc/Theora.pdf
#------------------------------------------------------------------------------
package Image::ExifTool::Theora;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
$VERSION = '1.00';
# Theora header types
%Image::ExifTool::Theora::Main = (
NOTES => q{
Information extracted from Ogg Theora video files. See
L<http://www.theora.org/doc/Theora.pdf> for the Theora specification.
},
0x80 => {
Name => 'Identification',
SubDirectory => {
TagTable => 'Image::ExifTool::Theora::Identification',
ByteOrder => 'BigEndian',
},
},
0x81 => {
Name => 'Comments',
SubDirectory => {
TagTable => 'Image::ExifTool::Vorbis::Comments',
},
},
# 0x82 - Setup
);
# tags extracted from Theora Idenfication header
%Image::ExifTool::Theora::Identification = (
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
GROUPS => { 2 => 'Video' },
NOTES => 'Tags extracted from the Theora identification header.',
0 => {
Name => 'TheoraVersion',
Format => 'int8u[3]',
PrintConv => '$val =~ tr/ /./; $val',
},
7 => {
Name => 'ImageWidth',
Format => 'int32u',
ValueConv => '$val >> 8',
},
10 => {
Name => 'ImageHeight',
Format => 'int32u',
ValueConv => '$val >> 8',
},
13 => 'XOffset',
14 => 'YOffset',
15 => {
Name => 'FrameRate',
Format => 'rational64u',
PrintConv => 'int($val * 1000 + 0.5) / 1000',
},
23 => {
Name => 'PixelAspectRatio',
Format => 'int16u[3]',
ValueConv => 'my @a=split(" ",$val); (($a[0]<<8)+($a[1]>>8)) / ((($a[1]&0xff)<<8)+$a[2])',
PrintConv => 'int($val * 1000 + 0.5) / 1000',
},
29 => {
Name => 'ColorSpace',
PrintConv => {
0 => 'Undefined',
1 => 'Rec. 470M',
2 => 'Rec. 470BG',
},
},
30 => {
Name => 'NominalVideoBitrate',
Format => 'int32u',
ValueConv => '$val >> 8',
PrintConv => {
0 => 'Unspecified',
OTHER => \&Image::ExifTool::ConvertBitrate,
},
},
33 => {
Name => 'Quality',
ValueConv => '$val >> 2',
},
34 => {
Name => 'PixelFormat',
ValueConv => '($val >> 3) & 0x3',
PrintConv => {
0 => '4:2:0',
2 => '4:2:2',
3 => '4:4:4',
},
},
);
1; # end
__END__
=head1 NAME
Image::ExifTool::Theora - Read Theora video meta information
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains definitions required by Image::ExifTool to extract meta
information from Theora video streams.
=head1 AUTHOR
Copyright 2003-2018, 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://www.theora.org/doc/Theora.pdf>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/Theora Tags>,
L<Image::ExifTool::TagNames/Ogg Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut
|
