#------------------------------------------------------------------------------
# File: DV.pm
#
# Description: Read DV meta information
#
# Revisions: 2010/12/24 - P. Harvey Created
#
# References: 1) http://www.ffmpeg.org/
# 2) http://dvswitch.alioth.debian.org/wiki/DV_format/
#------------------------------------------------------------------------------
package Image::ExifTool::DV;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
$VERSION = '1.01';
# DV profiles (ref 1)
my @dvProfiles = (
{
DSF => 0,
VideoSType => 0x0,
FrameSize => 120000,
VideoFormat => 'IEC 61834, SMPTE-314M - 525/60 (NTSC)',
VideoScanType => 'Progressive',
Colorimetry => '4:1:1',
FrameRate => 30000/1001,
ImageHeight => 480,
ImageWidth => 720,
},{
DSF => 1,
VideoSType => 0x0,
FrameSize => 144000,
VideoFormat => 'IEC 61834 - 625/50 (PAL)',
VideoScanType => 'Progressive',
Colorimetry => '4:2:0',
FrameRate => 25/1,
ImageHeight => 576,
ImageWidth => 720,
},{
DSF => 1,
VideoSType => 0x0,
FrameSize => 144000,
VideoFormat => 'SMPTE-314M - 625/50 (PAL)',
VideoScanType => 'Progressive',
Colorimetry => '4:1:1',
FrameRate => 25/1,
ImageHeight => 576,
ImageWidth => 720,
},{
DSF => 0,
VideoSType => 0x4,
FrameSize => 240000,
VideoFormat => 'DVCPRO50: SMPTE-314M - 525/60 (NTSC) 50 Mbps',
VideoScanType => 'Progressive',
Colorimetry => '4:2:2',
FrameRate => 30000/1001,
ImageHeight => 480,
ImageWidth => 720,
},{
DSF => 1,
VideoSType => 0x4,
FrameSize => 288000,
VideoFormat => 'DVCPRO50: SMPTE-314M - 625/50 (PAL) 50 Mbps',
VideoScanType => 'Progressive',
Colorimetry => '4:2:2',
FrameRate => 25/1,
ImageHeight => 576,
ImageWidth => 720,
},{
DSF => 0,
VideoSType => 0x14,
FrameSize => 480000,
VideoFormat => 'DVCPRO HD: SMPTE-370M - 1080i60 100 Mbps',
VideoScanType => 'Interlaced',
Colorimetry => '4:2:2',
FrameRate => 30000/1001,
ImageHeight => 1080,
ImageWidth => 1280,
},{
DSF => 1,
VideoSType => 0x14,
FrameSize => 576000,
VideoFormat => 'DVCPRO HD: SMPTE-370M - 1080i50 100 Mbps',
VideoScanType => 'Interlaced',
Colorimetry => '4:2:2',
FrameRate => 25/1,
ImageHeight => 1080,
ImageWidth => 1440,
},{
DSF => 0,
VideoSType => 0x18,
FrameSize => 240000,
VideoFormat => 'DVCPRO HD: SMPTE-370M - 720p60 100 Mbps',
VideoScanType => 'Progressive',
Colorimetry => '4:2:2',
FrameRate => 60000/1001,
ImageHeight => 720,
ImageWidth => 960,
},{
DSF => 1,
VideoSType => 0x18,
FrameSize => 288000,
VideoFormat => 'DVCPRO HD: SMPTE-370M - 720p50 100 Mbps',
VideoScanType => 'Progressive',
Colorimetry => '4:2:2',
FrameRate => 50/1,
ImageHeight => 720,
ImageWidth => 960,
},{
DSF => 1,
VideoSType => 0x1,
FrameSize => 144000,
VideoFormat => 'IEC 61883-5 - 625/50 (PAL)',
VideoScanType => 'Progressive',
Colorimetry => '4:2:0',
FrameRate => 25/1,
ImageHeight => 576,
ImageWidth => 720,
},
);
# tags to extract, in the order we want to extract them
my @dvTags = (
'DateTimeOriginal', 'ImageWidth', 'ImageHeight', 'Duration',
'TotalBitrate', 'VideoFormat', 'VideoScanType', 'FrameRate',
'AspectRatio', 'Colorimetry', 'AudioChannels', 'AudioSampleRate',
'AudioBitsPerSample',
);
# DV tags
%Image::ExifTool::DV::Main = (
GROUPS => { 2 => 'Video' },
VARS => { NO_ID => 1 },
NOTES => 'The following tags are extracted from DV videos.',
DateTimeOriginal => {
Groups => { 2 => 'Time' },
PrintConv => '$self->ConvertDateTime($val)',
},
ImageWidth => { },
ImageHeight => { },
Duration => { PrintConv => 'ConvertDuration($val)' },
TotalBitrate => { PrintConv => 'ConvertBitrate($val)' },
VideoFormat => { },
VideoScanType => { },
FrameRate => { PrintConv => 'int($val * 1000 + 0.5) / 1000' },
AspectRatio => { },
Colorimetry => { },
AudioChannels => { Groups => { 2 => 'Audio' } },
AudioSampleRate => { Groups => { 2 => 'Audio' } },
AudioBitsPerSample => { Groups => { 2 => 'Audio' } },
);
#------------------------------------------------------------------------------
# Read information in a DV file (ref 1)
# Inputs: 0) ExifTool ref, 1) dirInfo ref
# Returns: 1 on success, 0 if this wasn't a valid DV file
sub ProcessDV($$)
{
my ($et, $dirInfo) = @_;
local $_;
my $raf = $$dirInfo{RAF};
my ($buff, $start, $profile, $tag, $i, $j);
$raf->Read($buff, 12000) or return 0;
if ($buff =~ /\x1f\x07\0[\x3f\xbf]/sg) {
$start = pos($buff) - 4;
} else {
while ($buff =~ /[\0\xff]\x3f\x07\0.{76}\xff\x3f\x07\x01/sg) {
next if pos($buff) - 163 < 0;
$start = pos($buff) - 163;
last;
}
return 0 unless defined $start;
}
my $len = length $buff;
# must at least have a full DIF header
return 0 if $start + 80 * 6 > $len;
$et->SetFileType();
my $pos = $start;
my $dsf = Get8u(\$buff, $pos + 3) & 0x80 >> 7;
my $stype = Get8u(\$buff, $pos + 80*5 + 48 + 3) & 0x1f;
# 576i50 25Mbps 4:1:1 is a special case
if ($dsf == 1 && $stype == 0 && Get8u(\$buff, 4) & 0x07) {
$profile = $dvProfiles[2];
} else {
foreach (@dvProfiles) {
next unless $dsf == $$_{DSF} and $stype == $$_{VideoSType};
$profile = $_;
last;
}
$profile or $et->Warn("Unrecognized DV profile"), return 1;
}
my $tagTablePtr = GetTagTable('Image::ExifTool::DV::Main');
# calculate total bit rate and duration
my $byteRate = $$profile{FrameSize} * $$profile{FrameRate};
my $fileSize = $$et{VALUE}{FileSize};
$$profile{TotalBitrate} = 8 * $byteRate;
$$profile{Duration} = $fileSize / $byteRate if defined $fileSize;
# read DVPack metadata from the VAUX DIF's to extract video tags
delete $$profile{DateTimeOriginal};
delete $$profile{AspectRatio};
my ($date, $time, $is16_9);
for ($i=1; $i<6; ++$i) {
$pos += 80;
my $type = Get8u(\$buff, $pos);
next unless ($type & 0xf0) == 0x50; # look for VAUX types
for ($j=0; $j<15; ++$j) {
my $p = $pos + $j * 5 + 3;
$type = Get8u(\$buff, $p);
if ($type == 0x61) { # video control
my $apt = Get8u(\$buff, $start + 4) & 0x07;
my $t = Get8u(\$buff, $p + 2);
$is16_9 = (($t & 0x07) == 0x02 or (not $apt and ($t & 0x07) == 0x07));
} elsif ($type == 0x62) { # date
# mask off unused bits
my @d = unpack('C*', substr($buff, $p + 1, 4));
# (ignore timezone in byte 0 until we can test this properly - see ref 2)
$date = sprintf('%.2x:%.2x:%.2x', $d[3], $d[2] & 0x1f, $d[1] & 0x3f);
if ($date =~ /[a-f]/) {
undef $date; # invalid date
} else {
# add century (this will work until 2089)
$date = ($date lt '9' ? '20' : '19') . $date;
}
undef $time;
} elsif ($type == 0x63 and $date) { # time
# (ignore frames past second in byte 0 for now - see ref 2)
my $val = Get32u(\$buff, $p + 1) & 0x007f7f3f;
my @t = unpack('C*', substr($buff, $p + 1, 4));
$time = sprintf('%.2x:%.2x:%.2x', $t[3] & 0x3f, $t[2] & 0x7f, $t[1] & 0x7f);
last;
} else {
undef $time; # must be consecutive
}
}
}
if ($date and $time) {
$$profile{DateTimeOriginal} = "$date $time";
$$profile{AspectRatio} = $is16_9 ? '16:9' : '5:4' if defined $is16_9;
}
# read audio tags if available
delete $$profile{AudioSampleRate};
delete $$profile{AudioBitsPerSample};
delete $$profile{AudioChannels};
$pos = $start + 80*6 + 80*16*3 + 3;
if ($pos + 4 < $len and Get8u(\$buff, $pos) == 0x50) {
my $smpls = Get8u(\$buff, $pos + 1);
my $freq = (Get8u(\$buff, $pos + 4) >> 3) & 0x07;
my $stype = Get8u(\$buff, $pos + 3) & 0x1f;
my $quant = Get8u(\$buff, $pos + 4) & 0x07;
if ($freq < 3) {
$$profile{AudioSampleRate} = {0=>48000, 1=>44100, 2=>32000}->{$freq};
}
if ($stype < 3) {
$stype = 2 if $stype == 0 and $quant and $freq == 2;
$$profile{AudioChannels} = {0=>2, 1=>0, 2=>4, 3=>8}->{$stype};
}
$$profile{AudioBitsPerSample} = $quant ? 12 : 16;
}
# save our metadata
foreach $tag (@dvTags) {
next unless defined $$profile{$tag};
$et->HandleTag($tagTablePtr, $tag, $$profile{$tag});
}
return 1;
}
1; # end
__END__
=head1 NAME
Image::ExifTool::DV - Read DV meta information
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains definitions required by Image::ExifTool to read meta
information from DV (raw Digital Video) files.
=head1 AUTHOR
Copyright 2003-2017, 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://ffmpeg.org/>
=item L<http://dvswitch.alioth.debian.org/wiki/DV_format/>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/DV Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut