146 lines
3.4 KiB
Perl
146 lines
3.4 KiB
Perl
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#------------------------------------------------------------------------------
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# File: Theora.pm
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#
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# Description: Read Theora video meta information
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#
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# Revisions: 2011/07/13 - P. Harvey Created
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#
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# References: 1) http://www.theora.org/doc/Theora.pdf
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#------------------------------------------------------------------------------
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package Image::ExifTool::Theora;
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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 = '1.00';
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# Theora header types
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%Image::ExifTool::Theora::Main = (
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NOTES => q{
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Information extracted from Ogg Theora video files. See
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L<http://www.theora.org/doc/Theora.pdf> for the Theora specification.
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},
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0x80 => {
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Name => 'Identification',
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SubDirectory => {
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TagTable => 'Image::ExifTool::Theora::Identification',
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ByteOrder => 'BigEndian',
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},
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},
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0x81 => {
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Name => 'Comments',
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SubDirectory => {
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TagTable => 'Image::ExifTool::Vorbis::Comments',
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},
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},
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# 0x82 - Setup
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);
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# tags extracted from Theora Idenfication header
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%Image::ExifTool::Theora::Identification = (
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PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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GROUPS => { 2 => 'Video' },
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NOTES => 'Tags extracted from the Theora identification header.',
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0 => {
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Name => 'TheoraVersion',
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Format => 'int8u[3]',
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PrintConv => '$val =~ tr/ /./; $val',
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},
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7 => {
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Name => 'ImageWidth',
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Format => 'int32u',
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ValueConv => '$val >> 8',
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},
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10 => {
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Name => 'ImageHeight',
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Format => 'int32u',
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ValueConv => '$val >> 8',
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},
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13 => 'XOffset',
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14 => 'YOffset',
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15 => {
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Name => 'FrameRate',
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Format => 'rational64u',
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PrintConv => 'int($val * 1000 + 0.5) / 1000',
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},
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23 => {
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Name => 'PixelAspectRatio',
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Format => 'int16u[3]',
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ValueConv => 'my @a=split(" ",$val); (($a[0]<<8)+($a[1]>>8)) / ((($a[1]&0xff)<<8)+$a[2])',
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PrintConv => 'int($val * 1000 + 0.5) / 1000',
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},
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29 => {
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Name => 'ColorSpace',
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PrintConv => {
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0 => 'Undefined',
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1 => 'Rec. 470M',
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2 => 'Rec. 470BG',
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},
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},
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30 => {
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Name => 'NominalVideoBitrate',
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Format => 'int32u',
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ValueConv => '$val >> 8',
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PrintConv => {
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0 => 'Unspecified',
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OTHER => \&Image::ExifTool::ConvertBitrate,
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},
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},
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33 => {
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Name => 'Quality',
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ValueConv => '$val >> 2',
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},
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34 => {
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Name => 'PixelFormat',
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ValueConv => '($val >> 3) & 0x3',
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PrintConv => {
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0 => '4:2:0',
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2 => '4:2:2',
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3 => '4:4:4',
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},
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},
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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::Theora - Read Theora video 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 Theora video streams.
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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://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/Theora 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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