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