#------------------------------------------------------------------------------
# File: ASF.pm
#
# Description: Read ASF/WMA/WMV meta information
#
# Revisions: 12/23/2005 - P. Harvey Created
#
# References: 1) http://www.microsoft.com/windows/windowsmedia/format/asfspec.aspx
# 2) http://www.adobe.com/devnet/xmp/pdfs/XMPSpecificationPart3.pdf (Oct 2008)
#------------------------------------------------------------------------------
package Image::ExifTool::ASF;
use strict;
use vars qw($VERSION);
use Image::ExifTool qw(:DataAccess :Utils);
use Image::ExifTool::Exif;
use Image::ExifTool::RIFF;
$VERSION = '1.23';
sub ProcessASF($$;$);
sub ProcessContentDescription($$$);
sub ProcessExtendedContentDescription($$$);
sub ProcessMetadata($$$);
sub ProcessPicture($$$);
sub ProcessCodecList($$$);
# GUID definitions
my %errorCorrection = (
'20FB5700-5B55-11CF-A8FD-00805F5C442B' => 'No Error Correction',
'BFC3CD50-618F-11CF-8BB2-00AA00B4E220' => 'Audio Spread',
);
my %streamType = (
'F8699E40-5B4D-11CF-A8FD-00805F5C442B' => 'Audio',
'BC19EFC0-5B4D-11CF-A8FD-00805F5C442B' => 'Video',
'59DACFC0-59E6-11D0-A3AC-00A0C90348F6' => 'Command',
'B61BE100-5B4E-11CF-A8FD-00805F5C442B' => 'JFIF',
'35907DE0-E415-11CF-A917-00805F5C442B' => 'Degradable JPEG',
'91BD222C-F21C-497A-8B6D-5AA86BFC0185' => 'File Transfer',
'3AFB65E2-47EF-40F2-AC2C-70A90D71D343' => 'Binary',
);
my %mutex = (
'D6E22A00-35DA-11D1-9034-00A0C90349BE' => 'MutexLanguage',
'D6E22A01-35DA-11D1-9034-00A0C90349BE' => 'MutexBitrate',
'D6E22A02-35DA-11D1-9034-00A0C90349BE' => 'MutexUnknown',
);
my %bandwidthSharing = (
'AF6060AA-5197-11D2-B6AF-00C04FD908E9' => 'SharingExclusive',
'AF6060AB-5197-11D2-B6AF-00C04FD908E9' => 'SharingPartial',
);
my %typeSpecific = (
'776257D4-C627-41CB-8F81-7AC7FF1C40CC' => 'WebStreamMediaSubtype',
'DA1E6B13-8359-4050-B398-388E965BF00C' => 'WebStreamFormat',
);
my %advancedContentEncryption = (
'7A079BB6-DAA4-4e12-A5CA-91D38DC11A8D' => 'DRMNetworkDevices',
);
# ASF top level objects
%Image::ExifTool::ASF::Main = (
PROCESS_PROC => \&ProcessASF,
NOTES => q{
The ASF format is used by Windows WMA and WMV files, and DIVX videos. Tag
ID's aren't listed because they are huge 128-bit GUID's that would ruin the
formatting of this table.
},
'75B22630-668E-11CF-A6D9-00AA0062CE6C' => {
Name => 'Header',
SubDirectory => { TagTable => 'Image::ExifTool::ASF::Header', Size => 6 },
},
'75B22636-668E-11CF-A6D9-00AA0062CE6C' => 'Data',
'33000890-E5B1-11CF-89F4-00A0C90349CB' => 'SimpleIndex',
'D6E229D3-35DA-11D1-9034-00A0C90349BE' => 'Index',
'FEB103F8-12AD-4C64-840F-2A1D2F7AD48C' => 'MediaIndex',
'3CB73FD0-0C4A-4803-953D-EDF7B6228F0C' => 'TimecodeIndex',
'BE7ACFCB-97A9-42E8-9C71-999491E3AFAC' => { #2
Name => 'XMP',
SubDirectory => { TagTable => 'Image::ExifTool::XMP::Main' },
},
);
# ASF header objects
%Image::ExifTool::ASF::Header = (
PROCESS_PROC => \&ProcessASF,
'8CABDCA1-A947-11CF-8EE4-00C00C205365' => {
Name => 'FileProperties',
SubDirectory => { TagTable => 'Image::ExifTool::ASF::FileProperties' },
},
'B7DC0791-A9B7-11CF-8EE6-00C00C205365' => {
Name => 'StreamProperties',
SubDirectory => { TagTable => 'Image::ExifTool::ASF::StreamProperties' },
},
'5FBF03B5-A92E-11CF-8EE3-00C00C205365' => {
Name => 'HeaderExtension',
SubDirectory => { TagTable => 'Image::ExifTool::ASF::HeaderExtension', Size => 22 },
},
'86D15240-311D-11D0-A3A4-00A0C90348F6' => {
Name => 'CodecList',
SubDirectory => { TagTable => 'Image::ExifTool::ASF::CodecList' },
},
'1EFB1A30-0B62-11D0-A39B-00A0C90348F6' => 'ScriptCommand',
'F487CD01-A951-11CF-8EE6-00C00C205365' => 'Marker',
'D6E229DC-35DA-11D1-9034-00A0C90349BE' => 'BitrateMutualExclusion',
'75B22635-668E-11CF-A6D9-00AA0062CE6C' => 'ErrorCorrection',
'75B22633-668E-11CF-A6D9-00AA0062CE6C' => {
Name => 'ContentDescription',
SubDirectory => { TagTable => 'Image::ExifTool::ASF::ContentDescr' },
},
'2211B3FA-BD23-11D2-B4B7-00A0C955FC6E' => {
Name => 'ContentBranding',
SubDirectory => { TagTable => 'Image::ExifTool::ASF::ContentBranding' },
},
'D2D0A440-E307-11D2-97F0-00A0C95EA850' => {
Name => 'ExtendedContentDescr',
SubDirectory => { TagTable => 'Image::ExifTool::ASF::ExtendedDescr' },
},
'7BF875CE-468D-11D1-8D82-006097C9A2B2' => 'StreamBitrateProps',
'2211B3FB-BD23-11D2-B4B7-00A0C955FC6E' => 'ContentEncryption',
'298AE614-2622-4C17-B935-DAE07EE9289C' => 'ExtendedContentEncryption',
'2211B3FC-BD23-11D2-B4B7-00A0C955FC6E' => 'DigitalSignature',
'1806D474-CADF-4509-A4BA-9AABCB96AAE8' => 'Padding',
);
%Image::ExifTool::ASF::ContentDescr = (
PROCESS_PROC => \&ProcessContentDescription,
GROUPS => { 2 => 'Video' },
0 => 'Title',
1 => { Name => 'Author', Groups => { 2 => 'Author' } },
2 => { Name => 'Copyright', Groups => { 2 => 'Author' } },
3 => 'Description',
4 => 'Rating',
);
%Image::ExifTool::ASF::ContentBranding = (
PROCESS_PROC => \&ProcessContentBranding,
GROUPS => { 2 => 'Author' },
0 => {
Name => 'BannerImageType',
PrintConv => {
0 => 'None',
1 => 'Bitmap',
2 => 'JPEG',
3 => 'GIF',
},
},
1 => { Name => 'BannerImage', Groups => { 2 => 'Preview' }, Binary => 1 },
2 => 'BannerImageURL',
3 => 'CopyrightURL',
);
%Image::ExifTool::ASF::ExtendedDescr = (
PROCESS_PROC => \&ProcessExtendedContentDescription,
GROUPS => { 2 => 'Video' },
ASFLeakyBucketPairs => { Binary => 1 },
AspectRatioX => {},
AspectRatioY => {},
Author => { Groups => { 2 => 'Author' } },
AverageLevel => {},
BannerImageData => {},
BannerImageType => {},
BannerImageURL => {},
Bitrate => { PrintConv => 'ConvertBitrate($val)' },
Broadcast => {},
BufferAverage => {},
Can_Skip_Backward => {},
Can_Skip_Forward => {},
Copyright => { Groups => { 2 => 'Author' } },
CopyrightURL => { Groups => { 2 => 'Author' } },
CurrentBitrate => { PrintConv => 'ConvertBitrate($val)' },
Description => {},
DRM_ContentID => {},
DRM_DRMHeader_ContentDistributor => {},
DRM_DRMHeader_ContentID => {},
DRM_DRMHeader_IndividualizedVersion => {},
DRM_DRMHeader_KeyID => {},
DRM_DRMHeader_LicenseAcqURL => {},
DRM_DRMHeader_SubscriptionContentID => {},
DRM_DRMHeader => {},
DRM_IndividualizedVersion => {},
DRM_KeyID => {},
DRM_LASignatureCert => {},
DRM_LASignatureLicSrvCert => {},
DRM_LASignaturePrivKey => {},
DRM_LASignatureRootCert => {},
DRM_LicenseAcqURL => {},
DRM_V1LicenseAcqURL => {},
Duration => { PrintConv => 'ConvertDuration($val)' },
FileSize => {},
HasArbitraryDataStream => {},
HasAttachedImages => {},
HasAudio => {},
HasFileTransferStream => {},
HasImage => {},
HasScript => {},
HasVideo => {},
Is_Protected => {},
Is_Trusted => {},
IsVBR => {},
NSC_Address => {},
NSC_Description => {},
NSC_Email => {},
NSC_Name => {},
NSC_Phone => {},
NumberOfFrames => {},
OptimalBitrate => { PrintConv => 'ConvertBitrate($val)' },
PeakValue => {},
Rating => {},
Seekable => {},
Signature_Name => {},
Stridable => {},
Title => {},
VBRPeak => {},
# "WM/" tags...
AlbumArtist => {},
AlbumCoverURL => {},
AlbumTitle => {},
ASFPacketCount => {},
ASFSecurityObjectsSize => {},
AudioFileURL => {},
AudioSourceURL => {},
AuthorURL => { Groups => { 2 => 'Author' } },
BeatsPerMinute => {},
Category => {},
Codec => {},
Composer => {},
Conductor => {},
ContainerFormat => {},
ContentDistributor => {},
ContentGroupDescription => {},
Director => {},
DRM => {},
DVDID => {},
EncodedBy => {},
EncodingSettings => {},
EncodingTime => { Groups => { 2 => 'Time' } },
Genre => {},
GenreID => {},
InitialKey => {},
ISRC => {},
Language => {},
Lyrics => {},
Lyrics_Synchronised => {},
MCDI => {},
MediaClassPrimaryID => { ValueConv => 'Image::ExifTool::ASF::GetGUID($val)' },
MediaClassSecondaryID => { ValueConv => 'Image::ExifTool::ASF::GetGUID($val)' },
MediaCredits => {},
MediaIsDelay => {},
MediaIsFinale => {},
MediaIsLive => {},
MediaIsPremiere => {},
MediaIsRepeat => {},
MediaIsSAP => {},
MediaIsStereo => {},
MediaIsSubtitled => {},
MediaIsTape => {},
MediaNetworkAffiliation => {},
MediaOriginalBroadcastDateTime => { Groups => { 2 => 'Time' } },
MediaOriginalChannel => {},
MediaStationCallSign => {},
MediaStationName => {},
ModifiedBy => {},
Mood => {},
OriginalAlbumTitle => {},
OriginalArtist => {},
OriginalFilename => 'OriginalFileName',
OriginalLyricist => {},
OriginalReleaseTime => { Groups => { 2 => 'Time' } },
OriginalReleaseYear => { Groups => { 2 => 'Time' } },
ParentalRating => {},
ParentalRatingReason => {},
PartOfSet => {},
PeakBitrate => { PrintConv => 'ConvertBitrate($val)' },
Period => {},
Picture => {
SubDirectory => {
TagTable => 'Image::ExifTool::ASF::Picture',
},
},
PlaylistDelay => {},
Producer => {},
PromotionURL => {},
ProtectionType => {},
Provider => {},
ProviderCopyright => {},
ProviderRating => {},
ProviderStyle => {},
Publisher => {},
RadioStationName => {},
RadioStationOwner => {},
SharedUserRating => {},
StreamTypeInfo => {},
SubscriptionContentID => {},
SubTitle => 'Subtitle',
SubTitleDescription => 'SubtitleDescription',
Text => {},
ToolName => {},
ToolVersion => {},
Track => {},
TrackNumber => {},
UniqueFileIdentifier => {},
UserWebURL => {},
VideoClosedCaptioning => {},
VideoFrameRate => {},
VideoHeight => {},
VideoWidth => {},
WMADRCAverageReference => {},
WMADRCAverageTarget => {},
WMADRCPeakReference => {},
WMADRCPeakTarget => {},
WMCollectionGroupID => {},
WMCollectionID => {},
WMContentID => {},
Writer => { Groups => { 2 => 'Author' } },
Year => { Groups => { 2 => 'Time' } },
);
%Image::ExifTool::ASF::Picture = (
PROCESS_PROC => \&ProcessPicture,
GROUPS => { 2 => 'Image' },
0 => {
Name => 'PictureType',
PrintConv => { # (Note: Duplicated in ID3, ASF and FLAC modules!)
0 => 'Other',
1 => '32x32 PNG Icon',
2 => 'Other Icon',
3 => 'Front Cover',
4 => 'Back Cover',
5 => 'Leaflet',
6 => 'Media',
7 => 'Lead Artist',
8 => 'Artist',
9 => 'Conductor',
10 => 'Band',
11 => 'Composer',
12 => 'Lyricist',
13 => 'Recording Studio or Location',
14 => 'Recording Session',
15 => 'Performance',
16 => 'Capture from Movie or Video',
17 => 'Bright(ly) Colored Fish',
18 => 'Illustration',
19 => 'Band Logo',
20 => 'Publisher Logo',
},
},
1 => 'PictureMIMEType',
2 => 'PictureDescription',
3 => {
Name => 'Picture',
Groups => { 2 => 'Preview' },
Binary => 1,
},
);
%Image::ExifTool::ASF::FileProperties = (
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
GROUPS => { 2 => 'Video' },
0 => {
Name => 'FileID',
Format => 'binary[16]',
ValueConv => 'Image::ExifTool::ASF::GetGUID($val)',
},
16 => { Name => 'FileLength', Format => 'int64u' },
24 => {
Name => 'CreationDate',
Format => 'int64u',
Groups => { 2 => 'Time' },
# time is in 100 ns intervals since 0:00 UTC Jan 1, 1601
ValueConv => q{ # (89 leap years between 1601 and 1970)
my $t = $val / 1e7 - (((1970-1601)*365+89)*24*3600);
return Image::ExifTool::ConvertUnixTime($t) . 'Z';
},
PrintConv => '$self->ConvertDateTime($val)',
},
32 => { Name => 'DataPackets', Format => 'int64u' },
40 => {
Name => 'PlayDuration',
Format => 'int64u',
ValueConv => '$val / 1e7',
PrintConv => 'ConvertDuration($val)',
},
48 => {
Name => 'SendDuration',
Format => 'int64u',
ValueConv => '$val / 1e7',
PrintConv => 'ConvertDuration($val)',
},
56 => { Name => 'Preroll', Format => 'int64u' },
64 => { Name => 'Flags', Format => 'int32u' },
68 => { Name => 'MinPacketSize',Format => 'int32u' },
72 => { Name => 'MaxPacketSize',Format => 'int32u' },
76 => { Name => 'MaxBitrate', Format => 'int32u', PrintConv => 'ConvertBitrate($val)' },
);
%Image::ExifTool::ASF::StreamProperties = (
PROCESS_PROC => \&Image::ExifTool::ProcessBinaryData,
GROUPS => { 2 => 'Video' },
NOTES => 'Tags with index 54 and greater are conditional based on the StreamType.',
0 => {
Name => 'StreamType',
Format => 'binary[16]',
RawConv => sub { # set ASF_STREAM_TYPE for use in conditional tags
my ($val, $et) = @_;
$$et{ASF_STREAM_TYPE} = $streamType{GetGUID($val)} || '';
return $val;
},
ValueConv => 'Image::ExifTool::ASF::GetGUID($val)',
PrintConv => \%streamType,
},
16 => {
Name => 'ErrorCorrectionType',
Format => 'binary[16]',
ValueConv => 'Image::ExifTool::ASF::GetGUID($val)',
PrintConv => \%errorCorrection,
},
32 => {
Name => 'TimeOffset',
Format => 'int64u',
ValueConv => '$val / 1e7',
PrintConv => '"$val s"',
},
48 => {
Name => 'StreamNumber',
Format => 'int16u',
PrintConv => '($val & 0x7f) . ($val & 0x8000 ? " (encrypted)" : "")',
},
54 => [
{
Condition => '$self->{ASF_STREAM_TYPE} eq "Audio"',
Name => 'AudioCodecID',
Format => 'int16u',
PrintHex => 1,
SeparateTable => 'RIFF AudioEncoding',
PrintConv => \%Image::ExifTool::RIFF::audioEncoding,
},
{
Condition => '$self->{ASF_STREAM_TYPE} =~ /^(Video|JFIF|Degradable JPEG)$/',
Name => 'ImageWidth',
Format => 'int32u',
},
],
56 => {
Condition => '$self->{ASF_STREAM_TYPE} eq "Audio"',
Name => 'AudioChannels',
Format => 'int16u',
},
58 => [
{
Condition => '$self->{ASF_STREAM_TYPE} eq "Audio"',
Name => 'AudioSampleRate',
Format => 'int32u',
},
{
Condition => '$self->{ASF_STREAM_TYPE} =~ /^(Video|JFIF|Degradable JPEG)$/',
Name => 'ImageHeight',
Format => 'int32u',
},
],
);
%Image::ExifTool::ASF::HeaderExtension = (
PROCESS_PROC => \&ProcessASF,
'14E6A5CB-C672-4332-8399-A96952065B5A' => 'ExtendedStreamProps',
'A08649CF-4775-4670-8A16-6E35357566CD' => 'AdvancedMutualExcl',
'D1465A40-5A79-4338-B71B-E36B8FD6C249' => 'GroupMutualExclusion',
'D4FED15B-88D3-454F-81F0-ED5C45999E24' => 'StreamPrioritization',
'A69609E6-517B-11D2-B6AF-00C04FD908E9' => 'BandwidthSharing',
'7C4346A9-EFE0-4BFC-B229-393EDE415C85' => 'LanguageList',
'C5F8CBEA-5BAF-4877-8467-AA8C44FA4CCA' => {
Name => 'Metadata',
SubDirectory => {
# have seen some tags same as ExtendedDescr, so use this table - PH
TagTable => 'Image::ExifTool::ASF::ExtendedDescr',
ProcessProc => \&ProcessMetadata,
},
},
'44231C94-9498-49D1-A141-1D134E457054' => {
Name => 'MetadataLibrary',
SubDirectory => {
# have seen some tags same as ExtendedDescr, so use this table - PH
TagTable => 'Image::ExifTool::ASF::ExtendedDescr',
ProcessProc => \&ProcessMetadata,
},
},
'D6E229DF-35DA-11D1-9034-00A0C90349BE' => 'IndexParameters',
'6B203BAD-3F11-48E4-ACA8-D7613DE2CFA7' => 'TimecodeIndexParms',
'75B22630-668E-11CF-A6D9-00AA0062CE6C' => 'Compatibility',
'43058533-6981-49E6-9B74-AD12CB86D58C' => 'AdvancedContentEncryption',
'ABD3D211-A9BA-11cf-8EE6-00C00C205365' => 'Reserved1',
);
%Image::ExifTool::ASF::CodecList = (
PROCESS_PROC => \&ProcessCodecList,
VideoCodecName => {},
VideoCodecDescription => {},
AudioCodecName => {},
AudioCodecDescription => {},
OtherCodecName => {},
OtherCodecDescription => {},
);
#------------------------------------------------------------------------------
# Generate GUID from 16 bytes of binary data
# Inputs: 0) data
# Returns: GUID
sub GetGUID($)
{
# must do some byte swapping
my $val = shift;
return $val unless length($val) == 16;
my $buff = unpack('H*',pack('NnnNN',unpack('VvvNN',$val)));
$buff =~ s/(.{8})(.{4})(.{4})(.{4})/$1-$2-$3-$4-/;
return uc($buff);
}
#------------------------------------------------------------------------------
# Process ASF content description
# Inputs: 0) ExifTool object reference, 1) dirInfo ref, 2) tag table reference
# Returns: 1 on success
sub ProcessContentDescription($$$)
{
my ($et, $dirInfo, $tagTablePtr) = @_;
my $dataPt = $$dirInfo{DataPt};
my $dirLen = $$dirInfo{DirLen};
return 0 if $dirLen < 10;
my @len = unpack('v5', $$dataPt);
my $pos = 10;
my $tag;
foreach $tag (0..4) {
my $len = shift @len;
next unless $len;
return 0 if $pos + $len > $dirLen;
my $val = $et->Decode(substr($$dataPt,$pos,$len),'UCS2','II');
$et->HandleTag($tagTablePtr, $tag, $val);
$pos += $len;
}
return 1;
}
#------------------------------------------------------------------------------
# Process ASF content branding
# Inputs: 0) ExifTool object reference, 1) dirInfo ref, 2) tag table reference
# Returns: 1 on success
sub ProcessContentBranding($$$)
{
my ($et, $dirInfo, $tagTablePtr) = @_;
my $dataPt = $$dirInfo{DataPt};
my $dirLen = $$dirInfo{DirLen};
return 0 if $dirLen < 40;
# decode banner image type
$et->HandleTag($tagTablePtr, 0, unpack('V', $$dataPt));
# decode banner image, banner URL and copyright URL
my $pos = 4;
my $tag;
foreach $tag (1..3) {
return 0 if $pos + 4 > $dirLen;
my $size = unpack("x${pos}V", $$dataPt);
$pos += 4;
next unless $size;
return 0 if $pos + $size > $dirLen;
my $val = substr($$dataPt, $pos, $size);
$et->HandleTag($tagTablePtr, $tag, $val);
$pos += $size;
}
return 1;
}
#------------------------------------------------------------------------------
# Read ASF value
# Inputs: 0) ExifTool object ref, 1) data reference, 2) value offset,
# 3) format number, 4) size
# Returns: converted value
sub ReadASF($$$$$)
{
my ($et, $dataPt, $pos, $format, $size) = @_;
my @vals;
if ($format == 0) { # unicode string
$vals[0] = $et->Decode(substr($$dataPt,$pos,$size),'UCS2','II');
} elsif ($format == 2) { # 4-byte boolean
@vals = ReadValue($dataPt, $pos, 'int32u', undef, $size);
foreach (@vals) {
$_ = $_ ? 'True' : 'False';
}
} elsif ($format == 3) { # int32u
@vals = ReadValue($dataPt, $pos, 'int32u', undef, $size);
} elsif ($format == 4) { # int64u
@vals = ReadValue($dataPt, $pos, 'int64u', undef, $size);
} elsif ($format == 5) { # int16u
@vals = ReadValue($dataPt, $pos, 'int16u', undef, $size);
} else { # any other format (including 1, byte array): return raw data
$vals[0] = substr($$dataPt,$pos,$size);
}
return join ' ', @vals;
}
#------------------------------------------------------------------------------
# Process extended content description
# Inputs: 0) ExifTool object reference, 1) dirInfo ref, 2) tag table reference
# Returns: 1 on success
sub ProcessExtendedContentDescription($$$)
{
my ($et, $dirInfo, $tagTablePtr) = @_;
my $dataPt = $$dirInfo{DataPt};
my $dirLen = $$dirInfo{DirLen};
return 0 if $dirLen < 2;
my $count = Get16u($dataPt, 0);
$et->VerboseDir($dirInfo, $count);
my $pos = 2;
my $i;
for ($i=0; $i<$count; ++$i) {
return 0 if $pos + 6 > $dirLen;
my $nameLen = unpack("x${pos}v", $$dataPt);
$pos += 2;
return 0 if $pos + $nameLen + 4 > $dirLen;
my $tag = Image::ExifTool::Decode(undef,substr($$dataPt,$pos,$nameLen),'UCS2','II','Latin');
$tag =~ s/^WM\///; # remove leading "WM/"
$pos += $nameLen;
my ($dType, $dLen) = unpack("x${pos}v2", $$dataPt);
$pos += 4;
return 0 if $pos + $dLen > $dirLen;
my $val = ReadASF($et,$dataPt,$pos,$dType,$dLen);
$et->HandleTag($tagTablePtr, $tag, $val,
DataPt => $dataPt,
Start => $pos,
Size => $dLen,
);
$pos += $dLen;
}
return 1;
}
#------------------------------------------------------------------------------
# Process ASF metadata library (similar to ProcessExtendedContentDescription above)
# Inputs: 0) ExifTool object reference, 1) dirInfo ref, 2) tag table reference
# Returns: 1 on success
sub ProcessMetadata($$$)
{
my ($et, $dirInfo, $tagTablePtr) = @_;
my $dataPt = $$dirInfo{DataPt};
my $dirLen = $$dirInfo{DirLen};
return 0 if $dirLen < 2;
my $count = Get16u($dataPt, 0);
$et->VerboseDir($dirInfo, $count);
my $pos = 2;
my $i;
for ($i=0; $i<$count; ++$i) {
return 0 if $pos + 12 > $dirLen;
my ($index, $stream, $nameLen, $dType, $dLen) = unpack("x${pos}v4V", $$dataPt);
$pos += 12;
return 0 if $pos + $nameLen + $dLen > $dirLen;
my $tag = Image::ExifTool::Decode(undef,substr($$dataPt,$pos,$nameLen),'UCS2','II','Latin');
$tag =~ s/^WM\///; # remove leading "WM/"
$pos += $nameLen;
my $val = ReadASF($et,$dataPt,$pos,$dType,$dLen);
$et->HandleTag($tagTablePtr, $tag, $val,
DataPt => $dataPt,
Start => $pos,
Size => $dLen,
);
$pos += $dLen;
}
return 1;
}
#------------------------------------------------------------------------------
# Process WM/Picture preview
# Inputs: 0) ExifTool object reference, 1) dirInfo ref, 2) tag table reference
# Returns: 1 on success
sub ProcessPicture($$$)
{
my ($et, $dirInfo, $tagTablePtr) = @_;
my $dataPt = $$dirInfo{DataPt};
my $dirStart = $$dirInfo{DirStart};
my $dirLen = $$dirInfo{DirLen};
return 0 unless $dirLen > 9;
# extract picture type and length
my ($type, $picLen) = unpack("x${dirStart}CV", $$dataPt);
$et->VerboseDir('Picture');
$et->HandleTag($tagTablePtr, 0, $type);
# extract mime type and description strings (null-terminated unicode strings)
my $n = $dirLen - 5 - $picLen;
return 0 if $n & 0x01 or $n < 4;
my $str = substr($$dataPt, $dirStart+5, $n);
if ($str =~ /^((?:..)*?)\0\0((?:..)*?)\0\0/s) {
my ($mime, $desc) = ($1, $2);
$et->HandleTag($tagTablePtr, 1, $et->Decode($mime,'UCS2','II'));
$et->HandleTag($tagTablePtr, 2, $et->Decode($desc,'UCS2','II')) if length $desc;
}
$et->HandleTag($tagTablePtr, 3, substr($$dataPt, $dirStart+5+$n, $picLen));
return 1;
}
#------------------------------------------------------------------------------
# Process codec list
# Inputs: 0) ExifTool object reference, 1) dirInfo ref, 2) tag table reference
# Returns: 1 on success
sub ProcessCodecList($$$)
{
my ($et, $dirInfo, $tagTablePtr) = @_;
my $dataPt = $$dirInfo{DataPt};
my $dirLen = $$dirInfo{DirLen};
return 0 if $dirLen < 20;
my $count = Get32u($dataPt, 16);
$et->VerboseDir($dirInfo, $count);
my $pos = 20;
my $i;
my %codecType = ( 1 => 'Video', 2 => 'Audio' );
for ($i=0; $i<$count; ++$i) {
return 0 if $pos + 8 > $dirLen;
my $type = ($codecType{Get16u($dataPt, $pos)} || 'Other') . 'Codec';
# stupid Windows programmers: these lengths are in characters (others are in bytes)
my $nameLen = Get16u($dataPt, $pos + 2) * 2;
$pos += 4;
return 0 if $pos + $nameLen + 2 > $dirLen;
my $name = $et->Decode(substr($$dataPt,$pos,$nameLen),'UCS2','II');
$et->HandleTag($tagTablePtr, "${type}Name", $name);
my $descLen = Get16u($dataPt, $pos + $nameLen) * 2;
$pos += $nameLen + 2;
return 0 if $pos + $descLen + 2 > $dirLen;
my $desc = $et->Decode(substr($$dataPt,$pos,$descLen),'UCS2','II');
$et->HandleTag($tagTablePtr, "${type}Description", $desc);
my $infoLen = Get16u($dataPt, $pos + $descLen);
$pos += $descLen + 2 + $infoLen;
}
return 1;
}
#------------------------------------------------------------------------------
# Extract information from a ASF file
# Inputs: 0) ExifTool object reference, 1) dirInfo reference, 2) tag table ref
# Returns: 1 on success, 0 if this wasn't a valid ASF file
sub ProcessASF($$;$)
{
my ($et, $dirInfo, $tagTablePtr) = @_;
my $raf = $$dirInfo{RAF};
my $verbose = $et->Options('Verbose');
my $rtnVal = 0;
my $pos = 0;
my ($buff, $err, @parentTable, @childEnd);
for (;;) {
last unless $raf->Read($buff, 24) == 24;
$pos += 24;
my $tag = GetGUID(substr($buff,0,16));
unless ($tagTablePtr) {
# verify this is a valid ASF file
last unless $tag eq '75B22630-668E-11CF-A6D9-00AA0062CE6C';
my $fileType = $$et{FILE_EXT};
$fileType = 'ASF' unless $fileType and $fileType =~ /^(ASF|WMV|WMA|DIVX)$/;
$et->SetFileType($fileType);
SetByteOrder('II');
$tagTablePtr = GetTagTable('Image::ExifTool::ASF::Main');
$rtnVal = 1;
}
my $size = Image::ExifTool::Get64u(\$buff, 16) - 24;
if ($size < 0) {
$err = 'Invalid ASF object size';
last;
}
if ($size > 0x7fffffff) {
if ($size > 0x7fffffff * 4294967296) {
$err = 'Invalid ASF object size';
} elsif ($et->Options('LargeFileSupport')) {
if ($raf->Seek($size, 1)) {
$et->VPrint(0, " Skipped large ASF object ($size bytes)\n");
$pos += $size;
next;
}
$err = 'Error seeking past large ASF object';
} else {
$err = 'Large ASF objects not supported (LargeFileSupport not set)';
}
last;
}
# go back to parent tag table if done with previous children
if (@childEnd and $pos >= $childEnd[-1]) {
pop @childEnd;
$tagTablePtr = pop @parentTable;
$$et{INDENT} = substr($$et{INDENT},0,-2);
}
my $tagInfo = $et->GetTagInfo($tagTablePtr, $tag);
$verbose and $et->VerboseInfo($tag, $tagInfo);
if ($tagInfo) {
my $subdir = $$tagInfo{SubDirectory};
if ($subdir) {
my $subTable = GetTagTable($$subdir{TagTable});
if ($$subTable{PROCESS_PROC} eq \&ProcessASF) {
if (defined $$subdir{Size}) {
my $s = $$subdir{Size};
if ($verbose > 2) {
$raf->Read($buff, $s) == $s or $err = 'Truncated file', last;
$et->VerboseDump(\$buff);
} elsif (not $raf->Seek($s, 1)) {
$err = 'Seek error';
last;
}
# continue processing linearly using subTable
push @parentTable, $tagTablePtr;
push @childEnd, $pos + $size;
$tagTablePtr = $subTable;
$pos += $$subdir{Size};
if ($verbose) {
$$et{INDENT} .= '| ';
$et->VerboseDir($$tagInfo{Name});
}
next;
}
} elsif ($raf->Read($buff, $size) == $size) {
my %subdirInfo = (
DataPt => \$buff,
DirStart => 0,
DirLen => $size,
DirName => $$tagInfo{Name},
);
$et->VerboseDump(\$buff) if $verbose > 2;
unless ($et->ProcessDirectory(\%subdirInfo, $subTable, $$subdir{ProcessProc})) {
$et->Warn("Error processing $$tagInfo{Name} directory");
}
$pos += $size;
next;
} else {
$err = 'Unexpected end of file';
last;
}
}
}
if ($verbose > 2) {
$raf->Read($buff, $size) == $size or $err = 'Truncated file', last;
$et->VerboseDump(\$buff);
} elsif (not $raf->Seek($size, 1)) { # skip the block
$err = 'Seek error';
last;
}
$pos += $size;
}
$err and $et->Warn($err);
return $rtnVal;
}
1; # end
__END__
=head1 NAME
Image::ExifTool::ASF - Read ASF/WMA/WMV meta information
=head1 SYNOPSIS
This module is used by Image::ExifTool
=head1 DESCRIPTION
This module contains routines required by Image::ExifTool to extract
information from Microsoft Advanced Systems Format (ASF) files, including
Windows Media Audio (WMA) and Windows Media Video (WMV) files.
=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.microsoft.com/windows/windowsmedia/format/asfspec.aspx>
=back
=head1 SEE ALSO
L<Image::ExifTool::TagNames/ASF Tags>,
L<Image::ExifTool(3pm)|Image::ExifTool>
=cut