1114 lines
38 KiB
Perl
Executable File
1114 lines
38 KiB
Perl
Executable File
#------------------------------------------------------------------------------
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# File: H264.pm
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#
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# Description: Read meta information from H.264 video
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#
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# Revisions: 2010/01/31 - P. Harvey Created
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#
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# References: 1) http://www.itu.int/rec/T-REC-H.264/e (T-REC-H.264-200305-S!!PDF-E.pdf)
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# 2) http://miffteevee.co.uk/documentation/development/H264Parser_8cpp-source.html
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# 3) http://ffmpeg.org/
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# 4) US Patent 2009/0052875 A1
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# 5) European Patent (EP2 051 528A1) application no. 07792522.0 filed 08.08.2007
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# 6) Dave Nicholson private communication
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# 7) http://www.freepatentsonline.com/20050076039.pdf
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# 8) Michael Reitinger private communication (RX100)
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#
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# Glossary: RBSP = Raw Byte Sequence Payload
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#------------------------------------------------------------------------------
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package Image::ExifTool::H264;
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use strict;
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use vars qw($VERSION %convMake);
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use Image::ExifTool qw(:DataAccess :Utils);
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use Image::ExifTool::Exif;
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$VERSION = '1.13';
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sub ProcessSEI($$);
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my $parsePictureTiming; # flag to enable parsing of picture timing information (test only)
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# lookup for camera manufacturer name
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%convMake = (
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0x0103 => 'Panasonic',
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0x0108 => 'Sony',
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0x1011 => 'Canon',
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0x1104 => 'JVC', #Rob Lewis
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);
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# information extracted from H.264 video streams
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%Image::ExifTool::H264::Main = (
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GROUPS => { 2 => 'Video' },
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VARS => { NO_ID => 1 },
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NOTES => q{
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Tags extracted from H.264 video streams. The metadata for AVCHD videos is
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stored in this stream.
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},
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ImageWidth => { },
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ImageHeight => { },
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MDPM => { SubDirectory => { TagTable => 'Image::ExifTool::H264::MDPM' } },
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);
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# H.264 Supplemental Enhancement Information User Data (ref PH/4)
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%Image::ExifTool::H264::MDPM = (
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GROUPS => { 2 => 'Camera' },
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PROCESS_PROC => \&ProcessSEI,
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TAG_PREFIX => 'MDPM',
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NOTES => q{
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The following tags are decoded from the Modified Digital Video Pack Metadata
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(MDPM) of the unregistered user data with UUID
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17ee8c60f84d11d98cd60800200c9a66 in the H.264 Supplemental Enhancement
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Information (SEI). I<[Yes, this description is confusing, but nothing
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compared to the challenge of actually decoding the data!]> This information
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may exist at regular intervals through the entire video, but only the first
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occurrence is extracted unless the ExtractEmbedded (-ee) option is used (in
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which case subsequent occurrences are extracted as sub-documents).
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},
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# (Note: all these are explained in IEC 61834-4, but it costs money so it is useless to me)
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# 0x00 - ControlCassetteID (ref 7)
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# 0x01 - ControlTapeLength (ref 7)
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# 0x02 - ControlTimerActDate (ref 7)
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# 0x03 - ControlTimerACS_S_S (ref 7)
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# 0x04-0x05 - ControlPR_StartPoint (ref 7)
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# 0x06 - ControlTagIDNoGenre (ref 7)
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# 0x07 - ControlTopicPageHeader (ref 7)
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# 0x08 - ControlTextHeader (ref 7)
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# 0x09 - ControlText (ref 7)
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# 0x0a-0x0b - ControlTag (ref 7)
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# 0x0c - ControlTeletextInfo (ref 7)
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# 0x0d - ControlKey (ref 7)
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# 0x0e-0x0f - ControlZoneEnd (ref 7)
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# 0x10 - TitleTotalTime (ref 7)
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# 0x11 - TitleRemainTime (ref 7)
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# 0x12 - TitleChapterTotalNo (ref 7)
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0x13 => {
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Name => 'TimeCode',
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Notes => 'hours:minutes:seconds:frames',
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ValueConv => 'sprintf("%.2x:%.2x:%.2x:%.2x",reverse unpack("C*",$val))',
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},
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# 0x14 - TitleBinaryGroup
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# 0x15 - TitleCassetteNo (ref 7)
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# 0x16-0x17 - TitleSoftID (ref 7)
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# (0x18,0x19 listed as TitleTextHeader/TitleText by ref 7)
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0x18 => {
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Name => 'DateTimeOriginal',
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Description => 'Date/Time Original',
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Groups => { 2 => 'Time' },
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Notes => 'combined with tag 0x19',
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Combine => 1, # the next tag (0x19) contains the rest of the date
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# first byte is timezone information:
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# 0x80 - unused
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# 0x40 - DST flag
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# 0x20 - TimeZoneSign
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# 0x1e - TimeZoneValue
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# 0x01 - half-hour flag
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ValueConv => q{
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my ($tz, @a) = unpack('C*',$val);
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return sprintf('%.2x%.2x:%.2x:%.2x %.2x:%.2x:%.2x%s%.2d:%s%s', @a,
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$tz & 0x20 ? '-' : '+', ($tz >> 1) & 0x0f,
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$tz & 0x01 ? '30' : '00',
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$tz & 0x40 ? ' DST' : '');
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},
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PrintConv => '$self->ConvertDateTime($val)',
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},
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# 0x1a-0x1b - TitleStart (ref 7)
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# 0x1c-0x1d - TitleReelID (ref 7)
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# 0x1e-0x1f - TitleEnd (ref 7)
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# 0x20 - ChapterTotalTime (ref 7)
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# 0x42 - ProgramRecDTime (ref 7)
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# 0x50/0x60 - (AAUX/VAUX)Source (ref 7)
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# 0x51/0x61 - (AAUX/VAUX)SourceControl (ref 7)
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# 0x52/0x62 - (AAUX/VAUX)RecDate (ref 7)
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# 0x53/0x63 - (AAUX/VAUX)RecTime (ref 7)
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# 0x54/0x64 - (AAUX/VAUX)BinaryGroup (ref 7)
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# 0x55/0x65 - (AAUX/VAUX)ClosedCaption (ref 7)
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# 0x56/0x66 - (AAUX/VAUX)TR (ref 7)
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0x70 => { # ConsumerCamera1
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Name => 'Camera1',
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SubDirectory => { TagTable => 'Image::ExifTool::H264::Camera1' },
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},
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0x71 => { # ConsumerCamera2
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Name => 'Camera2',
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SubDirectory => { TagTable => 'Image::ExifTool::H264::Camera2' },
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},
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# 0x73 Lens - val: 0x75ffffd3,0x0effffd3,0x59ffffd3,0x79ffffd3,0xffffffd3...
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# 0x74 Gain
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# 0x75 Pedestal
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# 0x76 Gamma
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# 0x77 Detail
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# 0x7b CameraPreset
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# 0x7c Flare
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# 0x7d Shading
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# 0x7e Knee
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0x7f => { # Shutter
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Name => 'Shutter',
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SubDirectory => {
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TagTable => 'Image::ExifTool::H264::Shutter',
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ByteOrder => 'LittleEndian', # weird
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},
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},
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0xa0 => {
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Name => 'ExposureTime',
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Format => 'rational32u',
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Groups => { 2 => 'Image' },
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PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
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},
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0xa1 => {
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Name => 'FNumber',
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Format => 'rational32u',
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Groups => { 2 => 'Image' },
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},
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0xa2 => {
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Name => 'ExposureProgram',
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Format => 'int32u', # (guess)
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PrintConv => {
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0 => 'Not Defined',
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1 => 'Manual',
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2 => 'Program AE',
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3 => 'Aperture-priority AE',
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4 => 'Shutter speed priority AE',
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5 => 'Creative (Slow speed)',
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6 => 'Action (High speed)',
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7 => 'Portrait',
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8 => 'Landscape',
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},
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},
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0xa3 => {
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Name => 'BrightnessValue',
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Format => 'rational32s',
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Groups => { 2 => 'Image' },
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},
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0xa4 => {
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Name => 'ExposureCompensation',
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Format => 'rational32s',
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Groups => { 2 => 'Image' },
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PrintConv => 'Image::ExifTool::Exif::PrintFraction($val)',
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},
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0xa5 => {
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Name => 'MaxApertureValue',
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Format => 'rational32u',
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ValueConv => '2 ** ($val / 2)',
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PrintConv => 'sprintf("%.1f",$val)',
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},
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0xa6 => {
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Name => 'Flash',
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Format => 'int32u', # (guess)
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Flags => 'PrintHex',
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SeparateTable => 'EXIF Flash',
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PrintConv => \%Image::ExifTool::Exif::flash,
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},
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0xa7 => {
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Name => 'CustomRendered',
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Format => 'int32u', # (guess)
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Groups => { 2 => 'Image' },
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PrintConv => {
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0 => 'Normal',
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1 => 'Custom',
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},
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},
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0xa8 => {
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Name => 'WhiteBalance',
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Format => 'int32u', # (guess)
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Priority => 0,
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PrintConv => {
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0 => 'Auto',
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1 => 'Manual',
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},
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},
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0xa9 => {
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Name => 'FocalLengthIn35mmFormat',
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Format => 'rational32u',
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PrintConv => '"$val mm"',
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},
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0xaa => {
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Name => 'SceneCaptureType',
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Format => 'int32u', # (guess)
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PrintConv => {
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0 => 'Standard',
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1 => 'Landscape',
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2 => 'Portrait',
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3 => 'Night',
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},
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},
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# 0xab-0xaf ExifOption
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0xb0 => {
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Name => 'GPSVersionID',
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Format => 'int8u',
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Count => 4,
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Groups => { 1 => 'GPS', 2 => 'Location' },
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PrintConv => '$val =~ tr/ /./; $val',
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},
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0xb1 => {
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Name => 'GPSLatitudeRef',
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Format => 'string',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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PrintConv => {
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N => 'North',
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S => 'South',
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},
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},
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0xb2 => {
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Name => 'GPSLatitude',
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Format => 'rational32u',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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Notes => 'combined with tags 0xb3 and 0xb4',
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Combine => 2, # combine the next 2 tags (0xb2=deg, 0xb3=min, 0xb4=sec)
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ValueConv => 'Image::ExifTool::GPS::ToDegrees($val)',
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PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1)',
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},
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0xb5 => {
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Name => 'GPSLongitudeRef',
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Format => 'string',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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PrintConv => {
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E => 'East',
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W => 'West',
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},
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},
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0xb6 => {
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Name => 'GPSLongitude',
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Format => 'rational32u',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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Combine => 2, # combine the next 2 tags (0xb6=deg, 0xb7=min, 0xb8=sec)
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Notes => 'combined with tags 0xb7 and 0xb8',
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ValueConv => 'Image::ExifTool::GPS::ToDegrees($val)',
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PrintConv => 'Image::ExifTool::GPS::ToDMS($self, $val, 1)',
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},
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0xb9 => {
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Name => 'GPSAltitudeRef',
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Format => 'int32u', # (guess)
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Groups => { 1 => 'GPS', 2 => 'Location' },
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ValueConv => '$val ? 1 : 0', # because I'm not sure about the Format
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PrintConv => {
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0 => 'Above Sea Level',
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1 => 'Below Sea Level',
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},
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},
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0xba => {
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Name => 'GPSAltitude',
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Format => 'rational32u',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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},
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0xbb => {
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Name => 'GPSTimeStamp',
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Format => 'rational32u',
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Groups => { 1 => 'GPS', 2 => 'Time' },
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Combine => 2, # the next tags (0xbc/0xbd) contain the minutes/seconds
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Notes => 'combined with tags 0xbc and 0xbd',
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ValueConv => 'Image::ExifTool::GPS::ConvertTimeStamp($val)',
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PrintConv => 'Image::ExifTool::GPS::PrintTimeStamp($val)',
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},
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0xbe => {
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Name => 'GPSStatus',
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Format => 'string',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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PrintConv => {
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A => 'Measurement Active',
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V => 'Measurement Void',
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},
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},
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0xbf => {
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Name => 'GPSMeasureMode',
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Format => 'string',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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PrintConv => {
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2 => '2-Dimensional Measurement',
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3 => '3-Dimensional Measurement',
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},
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},
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0xc0 => {
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Name => 'GPSDOP',
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Description => 'GPS Dilution Of Precision',
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Format => 'rational32u',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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},
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0xc1 => {
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Name => 'GPSSpeedRef',
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Format => 'string',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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PrintConv => {
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K => 'km/h',
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M => 'mph',
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N => 'knots',
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},
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},
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0xc2 => {
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Name => 'GPSSpeed',
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Format => 'rational32u',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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},
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0xc3 => {
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Name => 'GPSTrackRef',
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Format => 'string',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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PrintConv => {
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M => 'Magnetic North',
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T => 'True North',
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},
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},
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0xc4 => {
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Name => 'GPSTrack',
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Format => 'rational32u',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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},
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0xc5 => {
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Name => 'GPSImgDirectionRef',
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Format => 'string',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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PrintConv => {
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M => 'Magnetic North',
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T => 'True North',
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},
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},
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0xc6 => {
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Name => 'GPSImgDirection',
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Format => 'rational32u',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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},
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0xc7 => {
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Name => 'GPSMapDatum',
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Format => 'string',
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Groups => { 1 => 'GPS', 2 => 'Location' },
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Combine => 1, # the next tag (0xc8) contains the rest of the string
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Notes => 'combined with tag 0xc8',
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},
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# 0xc9-0xcf - GPSOption
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0xe0 => {
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Name => 'MakeModel',
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SubDirectory => { TagTable => 'Image::ExifTool::H264::MakeModel' },
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},
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# 0xe1-0xef - MakerOption
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# 0xe1 - val: 0x01000670,0x01000678,0x06ffffff,0x01ffffff,0x01000020,0x01000400...
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# 0xe2-0xe8 - val: 0x00000000 in many samples
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0xe1 => { #6
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Name => 'RecInfo',
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Condition => '$$self{Make} eq "Canon"',
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Notes => 'Canon only',
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SubDirectory => { TagTable => 'Image::ExifTool::H264::RecInfo' },
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},
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0xe4 => { #PH
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Name => 'Model',
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Condition => '$$self{Make} eq "Sony"',
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Description => 'Camera Model Name',
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Notes => 'Sony cameras only, combined with tags 0xe5 and 0xe6',
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Format => 'string',
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Combine => 2, # (not sure about 0xe6, but include it just in case)
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RawConv => '$val eq "" ? undef : $val',
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},
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0xee => { #6 (HFS200)
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Name => 'FrameInfo',
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Condition => '$$self{Make} eq "Canon"',
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Notes => 'Canon only',
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SubDirectory => { TagTable => 'Image::ExifTool::H264::FrameInfo' },
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},
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);
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# ConsumerCamera1 information (ref PH)
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%Image::ExifTool::H264::Camera1 = (
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PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
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GROUPS => { 2 => 'Camera' },
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TAG_PREFIX => 'Camera1',
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PRINT_CONV => 'sprintf("0x%.2x",$val)',
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FIRST_ENTRY => 0,
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0 => {
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Name => 'ApertureSetting',
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PrintHex => 1,
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PrintConv => {
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0xff => 'Auto',
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0xfe => 'Closed',
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OTHER => sub { sprintf('%.1f', 2 ** (($_[0] & 0x3f) / 8)) },
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},
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},
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1 => {
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Name => 'Gain',
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Mask => 0x0f,
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# (0x0f would translate to 42 dB, but this value is used by the Sony
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# HXR-NX5U for any out-of-range value such as -6 dB or "hyper gain" - PH)
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ValueConv => '($val - 1) * 3',
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PrintConv => '$val==42 ? "Out of range" : "$val dB"',
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},
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1.1 => {
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Name => 'ExposureProgram',
|
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Mask => 0xf0,
|
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ValueConv => '$val == 0xf0 ? undef : $val',
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PrintConv => {
|
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0x00 => 'Program AE',
|
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0x10 => 'Gain', #?
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0x20 => 'Shutter speed priority AE',
|
|
0x30 => 'Aperture-priority AE',
|
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0x40 => 'Manual',
|
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},
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},
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2.1 => {
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Name => 'WhiteBalance',
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Mask => 0xe0,
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ValueConv => '$val == 0xe0 ? undef : $val',
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PrintConv => {
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0x00 => 'Auto',
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0x20 => 'Hold',
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0x40 => '1-Push',
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0x60 => 'Daylight',
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},
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},
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3 => {
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Name => 'Focus',
|
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ValueConv => '$val == 0xff ? undef : $val',
|
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PrintConv => q{
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my $foc = ($val & 0x7e) / (($val & 0x01) ? 40 : 400);
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return ($val & 0x80 ? 'Manual' : 'Auto') . " ($foc)";
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},
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},
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);
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|
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# ConsumerCamera2 information (ref PH)
|
|
%Image::ExifTool::H264::Camera2 = (
|
|
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
|
|
GROUPS => { 2 => 'Camera' },
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TAG_PREFIX => 'Camera2',
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PRINT_CONV => 'sprintf("0x%.2x",$val)',
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FIRST_ENTRY => 0,
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1 => {
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Name => 'ImageStabilization',
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PrintHex => 1,
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PrintConv => {
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0 => 'Off',
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0x3f => 'On (0x3f)', #8
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0xbf => 'Off (0xbf)', #8
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0xff => 'n/a',
|
|
OTHER => sub {
|
|
my $val = shift;
|
|
sprintf("%s (0x%.2x)", $val & 0x10 ? "On" : "Off", $val);
|
|
},
|
|
},
|
|
},
|
|
);
|
|
|
|
# camera info 0x7f (ref PH)
|
|
%Image::ExifTool::H264::Shutter = (
|
|
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
|
|
GROUPS => { 2 => 'Image' },
|
|
TAG_PREFIX => 'Shutter',
|
|
PRINT_CONV => 'sprintf("0x%.2x",$val)',
|
|
FIRST_ENTRY => 0,
|
|
FORMAT => 'int16u',
|
|
1.1 => { #6
|
|
Name => 'ExposureTime',
|
|
Mask => 0x7fff, # (what is bit 0x8000 for?)
|
|
RawConv => '$val == 0x7fff ? undef : $val', #7
|
|
ValueConv => '$val / 28125', #PH (Vixia HF G30, ref forum5588) (was $val/33640 until 9.49)
|
|
PrintConv => 'Image::ExifTool::Exif::PrintExposureTime($val)',
|
|
},
|
|
);
|
|
|
|
# camera info 0xe0 (ref PH)
|
|
%Image::ExifTool::H264::MakeModel = (
|
|
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
|
|
GROUPS => { 2 => 'Camera' },
|
|
FORMAT => 'int16u',
|
|
FIRST_ENTRY => 0,
|
|
0 => {
|
|
Name => 'Make',
|
|
PrintHex => 1,
|
|
RawConv => '$$self{Make} = ($Image::ExifTool::H264::convMake{$val} || "Unknown"); $val',
|
|
PrintConv => \%convMake,
|
|
},
|
|
# 1 => ModelIDCode according to ref 4/5 (I think not - PH)
|
|
# 1 => { Name => 'ModelIDCode', PrintConv => 'sprintf("%.4x",$val)' },
|
|
# vals: 0x0313 - various Pansonic HDC models
|
|
# 0x0345 - Panasonic HC-V7272
|
|
# 0x0414 - Panasonic AG-AF100
|
|
# 0x0591 - various Panasonic DMC models
|
|
# 0x3001 - various Sony DSC, HDR, NEX and SLT models
|
|
# 0x3003 - various Sony DSC models
|
|
# 0x3100 - various Sony DSC, ILCE, NEX and SLT models
|
|
# 0x1000 - Sony HDR-UX1
|
|
# 0x2000 - Canon HF100 (60i)
|
|
# 0x3000 - Canon HF100 (30p)
|
|
# 0x3101 - Canon HFM300 (PH, all qualities and frame rates)
|
|
# 0x3102 - Canon HFS200
|
|
# 0x4300 - Canon HFG30
|
|
);
|
|
|
|
# camera info 0xe1 (ref 6)
|
|
%Image::ExifTool::H264::RecInfo = (
|
|
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
|
|
GROUPS => { 2 => 'Camera' },
|
|
FORMAT => 'int8u',
|
|
NOTES => 'Recording information stored by some Canon video cameras.',
|
|
FIRST_ENTRY => 0,
|
|
0 => {
|
|
Name => 'RecordingMode',
|
|
PrintConv => {
|
|
0x02 => 'XP+', # High Quality 12 Mbps
|
|
0x04 => 'SP', # Standard Play 7 Mbps
|
|
0x05 => 'LP', # Long Play 5 Mbps
|
|
0x06 => 'FXP', # High Quality 17 Mbps
|
|
0x07 => 'MXP', # High Quality 24 Mbps
|
|
},
|
|
},
|
|
);
|
|
|
|
# camera info 0xee (ref 6)
|
|
%Image::ExifTool::H264::FrameInfo = (
|
|
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
|
|
GROUPS => { 2 => 'Video' },
|
|
FORMAT => 'int8u',
|
|
NOTES => 'Frame rate information stored by some Canon video cameras.',
|
|
FIRST_ENTRY => 0,
|
|
0 => 'CaptureFrameRate',
|
|
1 => 'VideoFrameRate',
|
|
# 2 - 8=60i, 10=PF30, 74=PF24 (PH, HFM300)
|
|
);
|
|
|
|
#==============================================================================
|
|
# Bitstream functions (used for H264 video)
|
|
#
|
|
# Member variables:
|
|
# Mask = mask for next bit to read (0 when all data has been read)
|
|
# Pos = byte offset of next word to read
|
|
# Word = current data word
|
|
# Len = total data length in bytes
|
|
# DataPt = data pointer
|
|
#..............................................................................
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Read next word from bitstream
|
|
# Inputs: 0) BitStream ref
|
|
# Returns: true if there is more data (and updates
|
|
# Mask, Pos and Word for first bit in next word)
|
|
sub ReadNextWord($)
|
|
{
|
|
my $bstr = shift;
|
|
my $pos = $$bstr{Pos};
|
|
if ($pos + 4 <= $$bstr{Len}) {
|
|
$$bstr{Word} = unpack("x$pos N", ${$$bstr{DataPt}});
|
|
$$bstr{Mask} = 0x80000000;
|
|
$$bstr{Pos} += 4;
|
|
} elsif ($pos < $$bstr{Len}) {
|
|
my @bytes = unpack("x$pos C*", ${$$bstr{DataPt}});
|
|
my ($word, $mask) = (shift(@bytes), 0x80);
|
|
while (@bytes) {
|
|
$word = ($word << 8) | shift(@bytes);
|
|
$mask <<= 8;
|
|
}
|
|
$$bstr{Word} = $word;
|
|
$$bstr{Mask} = $mask;
|
|
$$bstr{Pos} = $$bstr{Len};
|
|
} else {
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Create a new BitStream object
|
|
# Inputs: 0) data ref
|
|
# Returns: BitStream ref, or null if data is empty
|
|
sub NewBitStream($)
|
|
{
|
|
my $dataPt = shift;
|
|
my $bstr = {
|
|
DataPt => $dataPt,
|
|
Len => length($$dataPt),
|
|
Pos => 0,
|
|
Mask => 0,
|
|
};
|
|
ReadNextWord($bstr) or undef $bstr;
|
|
return $bstr;
|
|
}
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Get number of bits remaining in bit stream
|
|
# Inputs: 0) BitStream ref
|
|
# Returns: number of bits remaining
|
|
sub BitsLeft($)
|
|
{
|
|
my $bstr = shift;
|
|
my $bits = 0;
|
|
my $mask = $$bstr{Mask};
|
|
while ($mask) {
|
|
++$bits;
|
|
$mask >>= 1;
|
|
}
|
|
return $bits + 8 * ($$bstr{Len} - $$bstr{Pos});
|
|
}
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Get integer from bitstream
|
|
# Inputs: 0) BitStream ref, 1) number of bits
|
|
# Returns: integer (and increments position in bitstream)
|
|
sub GetIntN($$)
|
|
{
|
|
my ($bstr, $bits) = @_;
|
|
my $val = 0;
|
|
while ($bits--) {
|
|
$val <<= 1;
|
|
++$val if $$bstr{Mask} & $$bstr{Word};
|
|
$$bstr{Mask} >>= 1 and next;
|
|
ReadNextWord($bstr) or last;
|
|
}
|
|
return $val;
|
|
}
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Get Exp-Golomb integer from bitstream
|
|
# Inputs: 0) BitStream ref
|
|
# Returns: integer (and increments position in bitstream)
|
|
sub GetGolomb($)
|
|
{
|
|
my $bstr = shift;
|
|
# first, count the number of zero bits to get the integer bit width
|
|
my $count = 0;
|
|
until ($$bstr{Mask} & $$bstr{Word}) {
|
|
++$count;
|
|
$$bstr{Mask} >>= 1 and next;
|
|
ReadNextWord($bstr) or last;
|
|
}
|
|
# then return the adjusted integer
|
|
return GetIntN($bstr, $count + 1) - 1;
|
|
}
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Get signed Exp-Golomb integer from bitstream
|
|
# Inputs: 0) BitStream ref
|
|
# Returns: integer (and increments position in bitstream)
|
|
sub GetGolombS($)
|
|
{
|
|
my $bstr = shift;
|
|
my $val = GetGolomb($bstr) + 1;
|
|
return ($val & 1) ? -($val >> 1) : ($val >> 1);
|
|
}
|
|
|
|
# end bitstream functions
|
|
#==============================================================================
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Decode H.264 scaling matrices
|
|
# Inputs: 0) BitStream ref
|
|
# Reference: http://ffmpeg.org/
|
|
sub DecodeScalingMatrices($)
|
|
{
|
|
my $bstr = shift;
|
|
if (GetIntN($bstr, 1)) {
|
|
my ($i, $j);
|
|
for ($i=0; $i<8; ++$i) {
|
|
my $size = $i<6 ? 16 : 64;
|
|
next unless GetIntN($bstr, 1);
|
|
my ($last, $next) = (8, 8);
|
|
for ($j=0; $j<$size; ++$j) {
|
|
$next = ($last + GetGolombS($bstr)) & 0xff if $next;
|
|
last unless $j or $next;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Parse H.264 sequence parameter set RBSP (ref 1)
|
|
# Inputs) 0) ExifTool ref, 1) tag table ref, 2) data ref
|
|
sub ParseSeqParamSet($$$)
|
|
{
|
|
my ($et, $tagTablePtr, $dataPt) = @_;
|
|
# initialize our bitstream object
|
|
my $bstr = NewBitStream($dataPt) or return;
|
|
my ($t, $i, $j, $n);
|
|
# the messy nature of H.264 encoding makes it difficult to use
|
|
# data-driven structure parsing, so I code it explicitly (yuck!)
|
|
$t = GetIntN($bstr, 8); # profile_idc
|
|
GetIntN($bstr, 16); # constraints and level_idc
|
|
GetGolomb($bstr); # seq_parameter_set_id
|
|
if ($t >= 100) { # (ref b)
|
|
$t = GetGolomb($bstr); # chroma_format_idc
|
|
if ($t == 3) {
|
|
GetIntN($bstr, 1); # separate_colour_plane_flag
|
|
$n = 12;
|
|
} else {
|
|
$n = 8;
|
|
}
|
|
GetGolomb($bstr); # bit_depth_luma_minus8
|
|
GetGolomb($bstr); # bit_depth_chroma_minus8
|
|
GetIntN($bstr, 1); # qpprime_y_zero_transform_bypass_flag
|
|
DecodeScalingMatrices($bstr);
|
|
}
|
|
GetGolomb($bstr); # log2_max_frame_num_minus4
|
|
$t = GetGolomb($bstr); # pic_order_cnt_type
|
|
if ($t == 0) {
|
|
GetGolomb($bstr); # log2_max_pic_order_cnt_lsb_minus4
|
|
} elsif ($t == 1) {
|
|
GetIntN($bstr, 1); # delta_pic_order_always_zero_flag
|
|
GetGolomb($bstr); # offset_for_non_ref_pic
|
|
GetGolomb($bstr); # offset_for_top_to_bottom_field
|
|
$n = GetGolomb($bstr); # num_ref_frames_in_pic_order_cnt_cycle
|
|
for ($i=0; $i<$n; ++$i) {
|
|
GetGolomb($bstr); # offset_for_ref_frame[i]
|
|
}
|
|
}
|
|
GetGolomb($bstr); # num_ref_frames
|
|
GetIntN($bstr, 1); # gaps_in_frame_num_value_allowed_flag
|
|
my $w = GetGolomb($bstr); # pic_width_in_mbs_minus1
|
|
my $h = GetGolomb($bstr); # pic_height_in_map_units_minus1
|
|
my $f = GetIntN($bstr, 1); # frame_mbs_only_flag
|
|
$f or GetIntN($bstr, 1); # mb_adaptive_frame_field_flag
|
|
GetIntN($bstr, 1); # direct_8x8_inference_flag
|
|
# convert image size to pixels
|
|
$w = ($w + 1) * 16;
|
|
$h = (2 - $f) * ($h + 1) * 16;
|
|
# account for cropping (if any)
|
|
$t = GetIntN($bstr, 1); # frame_cropping_flag
|
|
if ($t) {
|
|
my $m = 4 - $f * 2;
|
|
$w -= 4 * GetGolomb($bstr);# frame_crop_left_offset
|
|
$w -= 4 * GetGolomb($bstr);# frame_crop_right_offset
|
|
$h -= $m * GetGolomb($bstr);# frame_crop_top_offset
|
|
$h -= $m * GetGolomb($bstr);# frame_crop_bottom_offset
|
|
}
|
|
# quick validity checks (just in case)
|
|
return unless $$bstr{Mask};
|
|
if ($w>=160 and $w<=4096 and $h>=120 and $h<=3072) {
|
|
$et->HandleTag($tagTablePtr, ImageWidth => $w);
|
|
$et->HandleTag($tagTablePtr, ImageHeight => $h);
|
|
# (whew! -- so much work just to get ImageSize!!)
|
|
}
|
|
# return now unless interested in picture timing information
|
|
return unless $parsePictureTiming;
|
|
|
|
# parse vui parameters if they exist
|
|
GetIntN($bstr, 1) or return; # vui_parameters_present_flag
|
|
$t = GetIntN($bstr, 1); # aspect_ratio_info_present_flag
|
|
if ($t) {
|
|
$t = GetIntN($bstr, 8); # aspect_ratio_idc
|
|
if ($t == 255) { # Extended_SAR ?
|
|
GetIntN($bstr, 32); # sar_width/sar_height
|
|
}
|
|
}
|
|
$t = GetIntN($bstr, 1); # overscan_info_present_flag
|
|
GetIntN($bstr, 1) if $t; # overscan_appropriate_flag
|
|
$t = GetIntN($bstr, 1); # video_signal_type_present_flag
|
|
if ($t) {
|
|
GetIntN($bstr, 4); # video_format/video_full_range_flag
|
|
$t = GetIntN($bstr, 1); # colour_description_present_flag
|
|
GetIntN($bstr, 24) if $t; # colour_primaries/transfer_characteristics/matrix_coefficients
|
|
}
|
|
$t = GetIntN($bstr, 1); # chroma_loc_info_present_flag
|
|
if ($t) {
|
|
GetGolomb($bstr); # chroma_sample_loc_type_top_field
|
|
GetGolomb($bstr); # chroma_sample_loc_type_bottom_field
|
|
}
|
|
$t = GetIntN($bstr, 1); # timing_info_present_flag
|
|
if ($t) {
|
|
return if BitsLeft($bstr) < 65;
|
|
$$et{VUI_units} = GetIntN($bstr, 32); # num_units_in_tick
|
|
$$et{VUI_scale} = GetIntN($bstr, 32); # time_scale
|
|
GetIntN($bstr, 1); # fixed_frame_rate_flag
|
|
}
|
|
my $hard;
|
|
for ($j=0; $j<2; ++$j) {
|
|
$t = GetIntN($bstr, 1); # nal_/vcl_hrd_parameters_present_flag
|
|
if ($t) {
|
|
$$et{VUI_hard} = 1;
|
|
$hard = 1;
|
|
$n = GetGolomb($bstr); # cpb_cnt_minus1
|
|
GetIntN($bstr, 8); # bit_rate_scale/cpb_size_scale
|
|
for ($i=0; $i<=$n; ++$i) {
|
|
GetGolomb($bstr); # bit_rate_value_minus1[SchedSelIdx]
|
|
GetGolomb($bstr); # cpb_size_value_minus1[SchedSelIdx]
|
|
GetIntN($bstr, 1); # cbr_flag[SchedSelIdx]
|
|
}
|
|
GetIntN($bstr, 5); # initial_cpb_removal_delay_length_minus1
|
|
$$et{VUI_clen} = GetIntN($bstr, 5); # cpb_removal_delay_length_minus1
|
|
$$et{VUI_dlen} = GetIntN($bstr, 5); # dpb_output_delay_length_minus1
|
|
$$et{VUI_toff} = GetIntN($bstr, 5); # time_offset_length
|
|
}
|
|
}
|
|
GetIntN($bstr, 1) if $hard; # low_delay_hrd_flag
|
|
$$et{VUI_pic} = GetIntN($bstr, 1); # pic_struct_present_flag
|
|
# (don't yet decode the rest of the vui data)
|
|
}
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Parse H.264 picture timing SEI message (payload type 1) (ref 1)
|
|
# Inputs) 0) ExifTool ref, 1) data ref
|
|
sub ParsePictureTiming($$)
|
|
{
|
|
my ($et, $dataPt) = @_;
|
|
my $bstr = NewBitStream($dataPt) or return;
|
|
my ($i, $t, $n);
|
|
# the specification is very odd on this point: the following delays
|
|
# exist if the VUI hardware parameters are present, or if
|
|
# "determined by the application, by some means not specified" -- WTF??
|
|
if ($$et{VUI_hard}) {
|
|
GetIntN($bstr, $$et{VUI_clen} + 1); # cpb_removal_delay
|
|
GetIntN($bstr, $$et{VUI_dlen} + 1); # dpb_output_delay
|
|
}
|
|
if ($$et{VUI_pic}) {
|
|
$t = GetIntN($bstr, 4); # pic_struct
|
|
# determine NumClockTS ($n)
|
|
$n = { 0=>1, 1=>1, 2=>1, 3=>2, 4=>2, 5=>3, 6=>3, 7=>2, 8=>3 }->{$t};
|
|
$n or return;
|
|
for ($i=0; $i<$n; ++$i) {
|
|
$t = GetIntN($bstr, 1); # clock_timestamp_flag[i]
|
|
next unless $t;
|
|
my ($nu, $s, $m, $h, $o);
|
|
GetIntN($bstr, 2); # ct_type
|
|
$nu = GetIntN($bstr, 1);# nuit_field_based_flag
|
|
GetIntN($bstr, 5); # counting_type
|
|
$t = GetIntN($bstr, 1); # full_timestamp_flag
|
|
GetIntN($bstr, 1); # discontinuity_flag
|
|
GetIntN($bstr, 1); # cnt_dropped_flag
|
|
GetIntN($bstr, 8); # n_frames
|
|
if ($t) {
|
|
$s = GetIntN($bstr, 6); # seconds_value
|
|
$m = GetIntN($bstr, 6); # minutes_value
|
|
$h = GetIntN($bstr, 5); # hours_value
|
|
} else {
|
|
$t = GetIntN($bstr, 1); # seconds_flag
|
|
if ($t) {
|
|
$s = GetIntN($bstr, 6); # seconds_value
|
|
$t = GetIntN($bstr, 1); # minutes_flag
|
|
if ($t) {
|
|
$m = GetIntN($bstr, 6); # minutes_value
|
|
$t = GetIntN($bstr, 1); # hours_flag
|
|
$h = GetIntN($bstr, 5) if $t; # hours_value
|
|
}
|
|
}
|
|
}
|
|
if ($$et{VUI_toff}) {
|
|
$o = GetIntN($bstr, $$et{VUI_toff}); # time_offset
|
|
}
|
|
last; # only parse the first clock timestamp found
|
|
}
|
|
}
|
|
}
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Process H.264 Supplementary Enhancement Information (ref 1/PH)
|
|
# Inputs: 0) Exiftool ref, 1) dirInfo ref, 2) tag table ref
|
|
# Returns: 1 if we processed payload type 5
|
|
sub ProcessSEI($$)
|
|
{
|
|
my ($et, $dirInfo) = @_;
|
|
my $dataPt = $$dirInfo{DataPt};
|
|
my $end = length($$dataPt);
|
|
my $pos = 0;
|
|
my ($type, $size, $index, $t);
|
|
|
|
# scan through SEI payload for type 5 (the unregistered user data)
|
|
for (;;) {
|
|
$type = 0;
|
|
for (;;) {
|
|
return 0 if $pos >= $end;
|
|
$t = Get8u($dataPt, $pos++); # payload type
|
|
$type += $t;
|
|
last unless $t == 255;
|
|
}
|
|
return 0 if $type == 0x80; # terminator (ref PH - maybe byte alignment bits?)
|
|
$size = 0;
|
|
for (;;) {
|
|
return 0 if $pos >= $end;
|
|
$t = Get8u($dataPt, $pos++); # payload data length
|
|
$size += $t;
|
|
last unless $t == 255;
|
|
}
|
|
return 0 if $pos + $size > $end;
|
|
if ($type == 1) { # picture timing information
|
|
if ($parsePictureTiming) {
|
|
my $buff = substr($$dataPt, $pos, $size);
|
|
ParsePictureTiming($et, $dataPt);
|
|
}
|
|
} elsif ($type == 5) { # unregistered user data
|
|
last; # exit loop to process user data now
|
|
}
|
|
$pos += $size;
|
|
}
|
|
|
|
# look for our 16-byte UUID
|
|
# - plus "MDPM" for "ModifiedDVPackMeta"
|
|
# - plus "GA94" for closed-caption data (currently not decoded)
|
|
return 0 unless $size > 20 and substr($$dataPt, $pos, 20) eq
|
|
"\x17\xee\x8c\x60\xf8\x4d\x11\xd9\x8c\xd6\x08\0\x20\x0c\x9a\x66MDPM";
|
|
|
|
# load the GPS module because it contains conversion routines and
|
|
# Composite tags needed for a number of tags we may be extracting
|
|
require Image::ExifTool::GPS;
|
|
#
|
|
# parse the MDPM records in the UUID 17ee8c60f84d11d98cd60800200c9a66
|
|
# unregistered user data payload (ref PH)
|
|
#
|
|
my $tagTablePtr = GetTagTable('Image::ExifTool::H264::MDPM');
|
|
my $oldIndent = $$et{INDENT};
|
|
$$et{INDENT} .= '| ';
|
|
$end = $pos + $size; # end of payload
|
|
$pos += 20; # skip UUID + "MDPM"
|
|
my $num = Get8u($dataPt, $pos++); # get entry count
|
|
my $lastTag = 0;
|
|
$et->VerboseDir('MDPM', $num) if $et->Options('Verbose');
|
|
# walk through entries in the MDPM payload
|
|
for ($index=0; $index<$num and $pos<$end; ++$index) {
|
|
my $tag = Get8u($dataPt, $pos);
|
|
if ($tag <= $lastTag) { # should be in numerical order (PH)
|
|
$et->Warn('Entries in MDPM directory are out of sequence');
|
|
last;
|
|
}
|
|
$lastTag = $tag;
|
|
my $buff = substr($$dataPt, $pos + 1, 4);
|
|
my $from;
|
|
my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
|
|
if ($tagInfo) {
|
|
# use our own print conversion for Unknown tags
|
|
if ($$tagInfo{Unknown} and not $$tagInfo{SetPrintConv}) {
|
|
$$tagInfo{PrintConv} = 'sprintf("0x%.8x", unpack("N", $val))';
|
|
$$tagInfo{SetPrintConv} = 1;
|
|
}
|
|
# combine with next value(s) if necessary
|
|
my $combine = $$tagTablePtr{$tag}{Combine};
|
|
while ($combine) {
|
|
last if $pos + 5 >= $end;
|
|
my $t = Get8u($dataPt, $pos + 5);
|
|
last if $t != $lastTag + 1; # must be consecutive tag ID's
|
|
$pos += 5;
|
|
$buff .= substr($$dataPt, $pos + 1, 4);
|
|
$from = $index unless defined $from;
|
|
++$index;
|
|
++$lastTag;
|
|
--$combine;
|
|
}
|
|
$et->HandleTag($tagTablePtr, $tag, undef,
|
|
TagInfo => $tagInfo,
|
|
DataPt => \$buff,
|
|
Size => length($buff),
|
|
Index => defined $from ? "$from-$index" : $index,
|
|
);
|
|
}
|
|
$pos += 5;
|
|
}
|
|
$$et{INDENT} = $oldIndent;
|
|
return 1;
|
|
}
|
|
|
|
#------------------------------------------------------------------------------
|
|
# Extract information from H.264 video stream
|
|
# Inputs: 0) ExifTool ref, 1) data ref
|
|
# Returns: 0 = done parsing, 1 = we want to parse more of these
|
|
sub ParseH264Video($$)
|
|
{
|
|
my ($et, $dataPt) = @_;
|
|
my $verbose = $et->Options('Verbose');
|
|
my $out = $et->Options('TextOut');
|
|
my $tagTablePtr = GetTagTable('Image::ExifTool::H264::Main');
|
|
my %parseNalUnit = ( 0x06 => 1, 0x07 => 1 ); # NAL unit types to parse
|
|
my $foundUserData;
|
|
my $len = length $$dataPt;
|
|
my $pos = 0;
|
|
while ($pos < $len) {
|
|
my ($nextPos, $end);
|
|
# find start of next NAL unit
|
|
if ($$dataPt =~ /(\0{2,3}\x01)/g) {
|
|
$nextPos = pos $$dataPt;
|
|
$end = $nextPos - length $1;
|
|
$pos or $pos = $nextPos, next;
|
|
} else {
|
|
last unless $pos;
|
|
$nextPos = $end = $len;
|
|
}
|
|
last if $pos >= $len;
|
|
# parse NAL unit from $pos to $end
|
|
my $nal_unit_type = Get8u($dataPt, $pos);
|
|
++$pos;
|
|
# check forbidden_zero_bit
|
|
$nal_unit_type & 0x80 and $et->Warn('H264 forbidden bit error'), last;
|
|
$nal_unit_type &= 0x1f;
|
|
# ignore this NAL unit unless we will parse it
|
|
$parseNalUnit{$nal_unit_type} or $verbose or $pos = $nextPos, next;
|
|
# read NAL unit (and convert all 0x000003's to 0x0000 as per spec.)
|
|
my $buff = '';
|
|
pos($$dataPt) = $pos + 1;
|
|
while ($$dataPt =~ /\0\0\x03/g) {
|
|
last if pos $$dataPt > $end;
|
|
$buff .= substr($$dataPt, $pos, pos($$dataPt)-1-$pos);
|
|
$pos = pos $$dataPt;
|
|
}
|
|
$buff .= substr($$dataPt, $pos, $end - $pos);
|
|
if ($verbose > 1) {
|
|
printf $out " NAL Unit Type: 0x%x (%d bytes)\n",$nal_unit_type, length $buff;
|
|
my %parms = ( Out => $out );
|
|
$parms{MaxLen} = 96 if $verbose < 4;
|
|
HexDump(\$buff, undef, %parms) if $verbose > 2;
|
|
}
|
|
pos($$dataPt) = $pos = $nextPos;
|
|
|
|
if ($nal_unit_type == 0x06) { # sei_rbsp (supplemental enhancement info)
|
|
|
|
if ($$et{GotNAL06}) {
|
|
# process only the first SEI unless ExtractEmbedded is set
|
|
next unless $et->Options('ExtractEmbedded');
|
|
$$et{DOC_NUM} = $$et{GotNAL06};
|
|
}
|
|
$foundUserData = ProcessSEI($et, { DataPt => \$buff } );
|
|
delete $$et{DOC_NUM};
|
|
# keep parsing SEI's until we find the user data
|
|
next unless $foundUserData;
|
|
$$et{GotNAL06} = ($$et{GotNAL06} || 0) + 1;
|
|
|
|
} elsif ($nal_unit_type == 0x07) { # sequence_parameter_set_rbsp
|
|
|
|
# process this NAL unit type only once
|
|
next if $$et{GotNAL07};
|
|
$$et{GotNAL07} = 1;
|
|
ParseSeqParamSet($et, $tagTablePtr, \$buff);
|
|
}
|
|
# we were successful, so don't parse this NAL unit type again
|
|
delete $parseNalUnit{$nal_unit_type};
|
|
}
|
|
# parse one extra H264 frame if we didn't find the user data in this one
|
|
# (Panasonic cameras don't put the SEI in the first frame)
|
|
return 0 if $foundUserData or $$et{ParsedH264};
|
|
$$et{ParsedH264} = 1;
|
|
return 1;
|
|
}
|
|
|
|
1; # end
|
|
|
|
__END__
|
|
|
|
=head1 NAME
|
|
|
|
Image::ExifTool::H264 - Read meta information from H.264 video
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
This module is used by Image::ExifTool
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This module contains routines required by Image::ExifTool to extract
|
|
information from H.264 video streams.
|
|
|
|
=head1 AUTHOR
|
|
|
|
Copyright 2003-2016, 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.itu.int/rec/T-REC-H.264/e>
|
|
|
|
=item L<http://miffteevee.co.uk/documentation/development/H264Parser_8cpp-source.html>
|
|
|
|
=item L<http://ffmpeg.org/>
|
|
|
|
=back
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<Image::ExifTool::TagNames/H264 Tags>,
|
|
L<Image::ExifTool(3pm)|Image::ExifTool>
|
|
|
|
=cut
|
|
|