WMA Tags in Autoit?

nobbe · January 10, 2007

hi

im trying to find a module or UDF to get the WMA tags from a file

so far i am using a little perl program external to get the info

Audio::WMA - Perl extension for reading WMA/ASF Metadata

thanks

CoePSX · January 10, 2007

Get that Perl program source code and try to translate it to AutoIt.

Also, there are probably lots of free tutorials around about how to do that. Even if they're in a different language, post it here and it would be much easier to help you out.

nobbe · January 10, 2007

ok here is the perl source

thanks

use Audio::WMA;
$file ="test.wma";

my $wma  = Audio::WMA->new($file);

#my $info = $wma->info();

#foreach (keys %$info)
#{
##        print "$_: $info->{$_}\n";
#}

my $tags = $wma->tags();

print "Title:    $tags->{TITLE}\n";
print "Artist:   $tags->{AUTHOR}\n";
print "Album:    $tags->{ALBUMTITLE}\n";
print "Year:     $tags->{YEAR}\n";
print "Comment:  $tags->{DESCRIPTION}\n";
print "Genre:    $tags->{GENRE}\n";

#foreach (keys %$tags)
#{
#        print "$_: $tags->{$_}\n";
#}

package Audio::WMA;

use strict;
use vars qw($VERSION);

# WMA stores tags in UTF-16LE by default.
my $utf8 = 0;

# Minimum requirements
if ($] > 5.007) {
    require Encode;
}

$VERSION = '1.1';

my %guidMapping   = _knownGUIDs();
my %reversedGUIDs = reverse %guidMapping;
my %objectParsers = _knownParsers();

my $DEBUG         = 0;

my $WORD          = 2;
my $DWORD         = 4;
my $QWORD         = 8;
my $GUID          = 16;

sub new {
    my $class = shift;
    my $file  = shift;

    my $self  = {};

    bless $self, $class;

    if (ref $file) {
        binmode $file;
        $self->{'fileHandle'} = $file;
    }
    else {
        open(FILE, $file) or do {
            warn "[$file] does not exist or cannot be read: $!";
            return undef;
        };

        binmode FILE;

        $self->{'filename'}   = $file;
        $self->{'fileHandle'} = \*FILE;
        $self->{'size'}       = -s $file;
    }

    $self->{'offset'}     = 0;

    $self->_parseWMAHeader();

    delete $self->{'headerData'};

    unless (ref $file) {
        close  $self->{'fileHandle'};
        close  FILE;
    }
    
    delete $self->{'fileHandle'};

    return $self;
}

sub parseObject {
    my $class = shift;
    my $data  = shift;
    
    # Read the GUID for this object
    my $hex = qr/[0-9A-F]/i;
    my $gr  = qr/($hex{8})($hex{4})($hex{4})($hex{4})($hex{12})/;
    
    my $guid;
    map { $guid .= $_ } unpack( 'H*', substr $data, 0, 16 );
    $guid      = uc( join '-', ( $guid =~ /$gr/ ) );
    my $name   = $reversedGUIDs{$guid};
    
    # Set up a new WMA object for parsing
    my $self = {
        headerData => $data,
        offset     => 16,
    };
    bless $self, $class;
    
    # Read the size
    my $objectSize = _parse64BitString($self->_readAndIncrementOffset(8));
    return -1 if !defined $objectSize;
    
    my $parser = $objectParsers{$name};
    
    if ( ref $parser ) {
        $DEBUG && warn "Parsing $name (size: $objectSize)\n";
        $parser->( $self );
    }
    else {
        $DEBUG && warn "No parser found for $name (size: $objectSize)\n";
    }
    
    return $self;
}

sub setConvertTagsToUTF8 {   
    my $class = shift;
    my $val   = shift;

    $utf8 = $val if (($val == 0) || ($val == 1));

    return $utf8;
}

sub setDebug {
    my $self = shift;

    $DEBUG = shift || 0;
}

sub info {
    my $self = shift;
    my $key = shift;

    return $self->{'INFO'} unless $key;
    return $self->{'INFO'}{lc $key};
}

sub tags {
    my $self = shift;
    my $key = shift;

    return $self->{'TAGS'} unless $key;
    return $self->{'TAGS'}{uc $key};
}

sub stream {
    my $self = shift;
    my $index = shift;

    return undef unless $self->{'STREAM'};
    return $self->{'STREAM'} unless defined($index);
    return $self->{'STREAM'}->[$index];
}

sub _readAndIncrementOffset {
    my $self  = shift;
    my $size  = shift;

    my $value = substr($self->{'headerData'}, $self->{'offset'}, $size);

    $self->{'offset'} += $size;

    return $value;
}

sub _readAndIncrementInlineOffset {
    my $self  = shift;
    my $size  = shift;

    my $value = substr($self->{'inlineData'}, $self->{'inlineOffset'}, $size);

    $self->{'inlineOffset'} += $size;

    return $value;
}

sub _UTF16ToUTF8 {
    my $data = shift;

    if ($utf8 && $] > 5.007) {

        # This also turns on the utf8 flag - perldoc Encode
        $data = eval { Encode::decode('UTF-16LE', $data) } || $data;

    } elsif ($] > 5.007) {

        # otherwise try and turn it into ISO-8859-1 if we have Encode
        $data = eval { Encode::encode('latin1', $data) } || $data;
    }

    return _denull($data);
}

sub _denull {
        my $string = shift;
        $string =~ s///g if defined $string;
        return $string;
}

sub _parseWMAHeader {
    my $self = shift;

    my $fh        = $self->{'fileHandle'};

    read($fh, my $headerObjectData, 30) or return -1;

    my $objectId      = substr($headerObjectData, 0, $GUID);
    my $objectSize    = unpack('V', substr($headerObjectData, 16, $QWORD) );
    my $headerObjects = unpack('V', substr($headerObjectData, 24, $DWORD));
    my $reserved1     = vec(substr($headerObjectData, 28, 1), 0, $DWORD);
    my $reserved2     = vec(substr($headerObjectData, 29, 1), 0, $DWORD);

    if ($DEBUG) {
        printf("ObjectId: [%s]\n", _byteStringToGUID($objectId));
        print  "\tobjectSize: [$objectSize]\n";
        print  "\theaderObjects [$headerObjects]\n";
        print  "\treserved1 [$reserved1]\n";
        print  "\treserved2 [$reserved2]\n\n";
    }

    # some sanity checks
    return -1 if ($self->{'size'} && $objectSize > $self->{'size'});

    read($fh, $self->{'headerData'}, ($objectSize - 30));

    for (my $headerCounter = 0; $headerCounter < $headerObjects; $headerCounter++) {

        my $nextObjectGUID     = $self->_readAndIncrementOffset($GUID);
        my $nextObjectGUIDText = _byteStringToGUID($nextObjectGUID);
        my $nextObjectSize     = _parse64BitString($self->_readAndIncrementOffset($QWORD));

        my $nextObjectGUIDName = $reversedGUIDs{$nextObjectGUIDText};

        # FIX: calculate the next offset up-front to allow for
        # object handlers that don't read the full object.
        my $nextObjectOffset   = $self->{'offset'} + ($nextObjectSize - (16 + 8));

        if ($DEBUG) {
            print "nextObjectGUID: [" . $nextObjectGUIDText . "]\n";
            print "nextObjectName: [" . (defined($nextObjectGUIDName) ? $nextObjectGUIDName : "<unknown>") . "]\n";
            print "nextObjectSize: [" . $nextObjectSize . "]\n";
            print "\n";
        }

        # FIX: don't error out on unknown objects (they are properly
        # skipped below), report a debug message if we get an
        # inconsistent object size. some sanity checks
        if ((!defined $nextObjectSize) || ($nextObjectSize > $self->{'size'})) {

            if ($DEBUG) {
                print "Inconsistent object size: $nextObjectSize\n";
            }

            return -1;
        }

        # FIX: fall-through to the bottom which sets the
        # offset for the next object.
        if (defined($nextObjectGUIDName)) {

            # start the different header types parsing              
            if ($nextObjectGUIDName eq 'ASF_File_Properties_Object') {
    
                $self->_parseASFFilePropertiesObject();
            }
    
            elsif ($nextObjectGUIDName eq 'ASF_Content_Description_Object') {
    
                $self->_parseASFContentDescriptionObject();
            }

            elsif ($nextObjectGUIDName eq 'ASF_Content_Encryption_Object' ||
                $nextObjectGUIDName eq 'ASF_Extended_Content_Encryption_Object') {

                $self->_parseASFContentEncryptionObject();
            }
    
            elsif ($nextObjectGUIDName eq 'ASF_Extended_Content_Description_Object') {
    
                $self->_parseASFExtendedContentDescriptionObject();
            }

            if ($nextObjectGUIDName eq 'ASF_Stream_Properties_Object') {

                $self->_parseASFStreamPropertiesObject(0);
                next;
            }
            
            elsif ($nextObjectGUIDName eq 'ASF_Stream_Bitrate_Properties_Object') {

                $self->_parseASFStreamBitratePropertiesObject();
            }

            elsif ($nextObjectGUIDName eq 'ASF_Header_Extension_Object') {

                $self->_parseASFHeaderExtensionObject();
            }
        }

        # FIX: set the next offset based on what we calculated
        # up-front, rather then relying on our object handlers.
        $self->{'offset'} = $nextObjectOffset;
    }

    # Now work on the subtypes.
    for my $stream (@{$self->{'STREAM'}}) {
        
        # insert stream bitrate
        $stream->{'bitrate'} = $self->{'BITRATES'}->{ $stream->{'streamNumber'} };

        if ($reversedGUIDs{ $stream->{'stream_type_guid'} } eq 'ASF_Audio_Media') {

            my $audio = $self->_parseASFAudioMediaObject($stream);

            while (my ($key, $value) = each %$audio) {

                $self->{'INFO'}->{$key} = $value;
            }
        }
    }

    # pull these out and normalize them.
    my @arrayOk = qw(ALBUMARTIST GENRE COMPOSER AUTHOR);

    for my $ext (@{$self->{'EXT'}}) {

        while (my ($k,$v) = each %{$ext->{'content'}}) {

            # this gets both WM/Title and isVBR
            next unless $v->{'name'} =~ s#^(?:WM/|is)##i || $v->{'name'} =~ /^Author/;

            my $name  = uc($v->{'name'});
            my $value = $v->{'value'} || 0;

            # Append onto an existing item, as an array ref
            if (exists $self->{'TAGS'}->{$name} && grep { /^$name$/ } @arrayOk) {

                if (ref($self->{'TAGS'}->{$name}) eq 'ARRAY') {

                    push @{$self->{'TAGS'}->{$name}}, $value;

                } else {

                    my $oldValue = delete $self->{'TAGS'}->{$name};

                    @{$self->{'TAGS'}->{$name}} = ($oldValue, $value);
                }

            } else {

                $self->{'TAGS'}->{$name} = $value;
            }
        }
    }

    delete $self->{'EXT'};
}

# We can't do anything about DRM'd files.
sub _parseASFContentEncryptionObject {
    my $self = shift;

    $self->{'INFO'}->{'drm'} = 1;
}

sub _parseASFFilePropertiesObject {
    my $self = shift;

    my %info = ();

    $info{'fileid_guid'}        = _byteStringToGUID($self->_readAndIncrementOffset($GUID));

    $info{'filesize'}       = _parse64BitString($self->_readAndIncrementOffset($QWORD));

    $info{'creation_date'}      = unpack('V', $self->_readAndIncrementOffset($QWORD));
    $info{'creation_date_unix'} = _fileTimeToUnixTime($info{'creation_date'});

    $info{'data_packets'}       = unpack('V', $self->_readAndIncrementOffset($QWORD));

    $info{'play_duration'}      = _parse64BitString($self->_readAndIncrementOffset($QWORD));
    $info{'send_duration'}      = _parse64BitString($self->_readAndIncrementOffset($QWORD));
    $info{'preroll'}        = unpack('V', $self->_readAndIncrementOffset($QWORD));
    $info{'playtime_seconds'}   = ($info{'play_duration'} / 10000000)-($info{'preroll'} / 1000);

    $info{'flags_raw'}      = unpack('V', $self->_readAndIncrementOffset(4));

    $info{'flags'}->{'broadcast'}   = ($info{'flags_raw'} & 0x0001) ? 1 : 0;
    $info{'flags'}->{'seekable'}    = ($info{'flags_raw'} & 0x0002) ? 1 : 0;

    $info{'min_packet_size'}    = unpack('V', $self->_readAndIncrementOffset($DWORD));
    $info{'max_packet_size'}    = unpack('V', $self->_readAndIncrementOffset($DWORD));
    $info{'max_bitrate'}        = unpack('V', $self->_readAndIncrementOffset($DWORD));

    $info{'bitrate'}        = ($info{'playtime_seconds'}) ? ($info{'filesize'} * 8) / $info{'playtime_seconds'} : undef;

    $self->{'INFO'}         = \%info;
}

sub _parseASFContentDescriptionObject {
    my $self = shift;

    my %desc = ();
    my @keys = qw(TITLE AUTHOR COPYRIGHT DESCRIPTION RATING);

    # populate the lengths of each key
    for my $key (@keys) {
        $desc{"_${key}length"}  = unpack('v', $self->_readAndIncrementOffset($WORD));
    }

    # now pull the data based on length
    for my $key (@keys) {

        my $lengthKey  = "_${key}length";
        $desc{$key} = _UTF16ToUTF8($self->_readAndIncrementOffset($desc{$lengthKey}));

        delete $desc{$lengthKey};
    }

    $self->{'TAGS'} = \%desc;
}

sub _parseASFExtendedContentDescriptionObject {
    my $self = shift;

    my %ext  = ();

    my $content_count = unpack('v', $self->_readAndIncrementOffset($WORD));

    for (my $id = 0; $id < $content_count; $id++) {

        my $name_length  = unpack('v', $self->_readAndIncrementOffset($WORD));
        my $name         = _denull( $self->_readAndIncrementOffset($name_length) );
        my $data_type    = unpack('v', $self->_readAndIncrementOffset($WORD));
        my $data_length  = unpack('v', $self->_readAndIncrementOffset($WORD));
        my $value        = $self->_bytesToValue($data_type, $self->_readAndIncrementOffset($data_length));

        if ($DEBUG && $name ne 'WM/Picture') {
            print "Ext Cont Desc: $id";
            print "\tname   = $name\n";
            print "\tvalue  = $value\n";
            print "\ttype   = $data_type\n";
            print "\tlength = $data_length\n";
            print "\n";
        }

        # Parse out the WM/Picture structure into something we can use.
        #
        # typedef struct _WMPicture {
        #  LPWSTR  pwszMIMEType;
        #  BYTE  bPictureType;
        #  LPWSTR  pwszDescription;
        #  DWORD  dwDataLen;
        #  BYTE*  pbData;
        # };

        if ($name eq 'WM/Picture') {

            my $image_type_id = unpack('v', substr($value, 0, 1));
            my $image_size    = unpack('v', substr($value, 1, $DWORD));
            my $image_mime    = '';
            my $image_desc    = '';
            my $image_data    = '';
            my $offset        = 5;
            my $byte_pair     = '';

            do {
                $byte_pair = substr($value, $offset, 2);
                $offset   += 2;
                $image_mime .= $byte_pair;

            } while ($byte_pair ne "\x00\x00");

            do {
                $byte_pair = substr($value, $offset, 2);
                $offset   += 2;
                $image_desc .= $byte_pair;

            } while ($byte_pair ne "\x00\x00");

            $image_mime = _UTF16ToUTF8($image_mime);
            $image_desc = _UTF16ToUTF8($image_desc);
            $image_data = substr($value, $offset, $image_size);

            $value = {
                'TYPE' => $image_mime,
                'DATA' => $image_data,
            };

            if ($DEBUG) {
                print "Ext Cont Desc: $id";
                print "\tname          = $name\n";
                print "\timage_type_id = $image_type_id\n";
                print "\timage_size    = $image_size\n";
                print "\timage_mime    = $image_mime\n";
                print "\timage_desc    = $image_desc\n";
                print "\n";
            }
        }

        $ext{'content'}->{$id} = {
            'name'        => $name,
            'value'       => $value,
        };
    }

    push @{$self->{'EXT'}}, \%ext;
}

sub _parseASFStreamPropertiesObject {
    my $self  = shift;
    my $inline = shift;

    my %stream  = ();
    my $streamNumber;

    # Stream Properties Object: (mandatory, one per media stream)
    # Field Name                   Field Type   Size (bits)
    # Object ID                    GUID         128             GUID for stream properties object - ASF_Stream_Properties_Object
    # Object Size                  QWORD        64              size of stream properties object, including 78 bytes of 
    #                               Stream Properties Object header
    # Stream Type                  GUID         128             ASF_Audio_Media, ASF_Video_Media or ASF_Command_Media
    # Error Correction Type        GUID         128             ASF_Audio_Spread for audio-only streams, 
    #                                ASF_No_Error_Correction for other stream types
    # Time Offset                  QWORD        64              100-nanosecond units. typically zero. added to all 
    #                               timestamps of samples in the stream
    # Type-Specific Data Length    DWORD        32              number of bytes for Type-Specific Data field
    # Error Correction Data Length DWORD        32              number of bytes for Error Correction Data field
    # Flags                        WORD         16              
    # * Stream Number              bits         7 (0x007F)      number of this stream.  1 <= valid <= 127
    # * Reserved                   bits         8 (0x7F80)      reserved - set to zero
    # * Encrypted Content Flag     bits         1 (0x8000)      stream contents encrypted if set
    # Reserved                     DWORD        32              reserved - set to zero
    # Type-Specific Data           BYTESTREAM   variable        type-specific format data, depending on value of Stream Type
    # Error Correction Data        BYTESTREAM   variable        error-correction-specific format data, depending on 
    #                               value of Error Correct Type
    #
    # There is one ASF_Stream_Properties_Object for each stream (audio, video) but the
    # stream number isn't known until halfway through decoding the structure, hence it
    # it is decoded to a temporary variable and then stuck in the appropriate index later
    my $method = $inline ? '_readAndIncrementInlineOffset' : '_readAndIncrementOffset';

    $stream{'stream_type'}        = $self->$method($GUID);
    $stream{'stream_type_guid'}   = _byteStringToGUID($stream{'stream_type'});
    $stream{'error_correct_type'} = $self->$method($GUID);
    $stream{'error_correct_guid'} = _byteStringToGUID($stream{'error_correct_type'});

    $stream{'time_offset'}        = unpack('v', $self->$method($QWORD));
    $stream{'type_data_length'}   = unpack('v', $self->$method($DWORD));
    $stream{'error_data_length'}  = unpack('v', $self->$method($DWORD));
    $stream{'flags_raw'}          = unpack('v', $self->$method($WORD));
    $stream{'streamNumber'}       = $stream{'flags_raw'} & 0x007F;
    $stream{'flags'}{'encrypted'} = ($stream{'flags_raw'} & 0x8000);

    # Skip the DWORD
    $self->$method($DWORD);

    $stream{'type_specific_data'} = $self->$method($stream{'type_data_length'});
    $stream{'error_correct_data'} = $self->$method($stream{'error_data_length'});

    push @{$self->{'STREAM'}}, \%stream;
}

sub _parseASFStreamBitratePropertiesObject {
    my $self = shift;
    
    my $bitrates = {};
    
    my $count = unpack('v', $self->_readAndIncrementOffset($WORD));
    
    # Read each bitrate record
    for ( 1..$count ) {
        my $stream  = unpack('v', $self->_readAndIncrementOffset($WORD)) & 0x007F;
        my $bitrate = unpack('V', $self->_readAndIncrementOffset($DWORD));
        
        $bitrates->{$stream} = $bitrate;
    }
    
    $self->{'BITRATES'} = $bitrates;
}

sub _parseASFAudioMediaObject {
    my $self   = shift;
    my $stream = shift;

    # Field Name                   Field Type   Size (bits)
    # Codec ID / Format Tag        WORD         16              unique ID of audio codec - defined as wFormatTag 
    #                                 field of WAVEFORMATEX structure
    #
    # Number of Channels           WORD         16              number of channels of audio - defined as nChannels 
    #                               field of WAVEFORMATEX structure
    #
    # Samples Per Second           DWORD        32              in Hertz - defined as nSamplesPerSec field 
    #                               of WAVEFORMATEX structure
    #
    # Average number of Bytes/sec  DWORD        32              bytes/sec of audio stream  - defined as 
    #                               nAvgBytesPerSec field of WAVEFORMATEX structure
    #
    # Block Alignment              WORD         16              block size in bytes of audio codec - defined 
    #                               as nBlockAlign field of WAVEFORMATEX structure
    #
    # Bits per sample              WORD         16              bits per sample of mono data. set to zero for 
    #                               variable bitrate codecs. defined as wBitsPerSample 
    #                               field of WAVEFORMATEX structure
    #
    # Codec Specific Data Size     WORD         16              size in bytes of Codec Specific Data buffer - 
    #                               defined as cbSize field of WAVEFORMATEX structure
    #
    # Codec Specific Data          BYTESTREAM   variable        array of codec-specific data bytes

    $stream->{'audio'} = $self->_parseWavFormat(substr($stream->{'type_specific_data'}, 0, $GUID));

    return $stream->{'audio'};
}

sub _parseWavFormat {
    my $self = shift;
    my $data = shift;

    my $wFormatTag = unpack('v', substr($data,  0, 2));

    my %wav  = (
        'codec'           => _RIFFwFormatTagLookup($wFormatTag),
        'channels'        => unpack('v', substr($data,  2, $WORD)),
        'sample_rate'     => unpack('v', substr($data,  4, $DWORD)),
        # See bitrate in _parseASFFilePropertiesObject() for the correct calculation.
        #'bitrate'         => unpack('v', substr($data,  8, $DWORD)) * 8,
        'bits_per_sample' => unpack('v', substr($data, 14, $WORD)),
    );

    if ($wFormatTag == 0x0001 || $wFormatTag == 0x0163) {

        $wav{'lossless'} = 1;
    }

    return \%wav;
}

sub _parseASFExtendedStreamPropertiesObject {
    my $self = shift;
    my $size = shift;

    my $offset = $self->{'inlineOffset'};

    my %ext = (
        startTime             => $self->_bytesToValue(4, $self->_readAndIncrementInlineOffset($QWORD)),
        endTime               => $self->_bytesToValue(4, $self->_readAndIncrementInlineOffset($QWORD)),
        dataBitrate           => $self->_bytesToValue(3, $self->_readAndIncrementInlineOffset($DWORD)),
        bufferSize            => $self->_bytesToValue(3, $self->_readAndIncrementInlineOffset($DWORD)),
        bufferFullness        => $self->_bytesToValue(3, $self->_readAndIncrementInlineOffset($DWORD)),
        altDataBitrate        => $self->_bytesToValue(3, $self->_readAndIncrementInlineOffset($DWORD)),
        altBufferSize         => $self->_bytesToValue(3, $self->_readAndIncrementInlineOffset($DWORD)),
        altBufferFullness     => $self->_bytesToValue(3, $self->_readAndIncrementInlineOffset($DWORD)),
        maxObjectSize         => $self->_bytesToValue(3, $self->_readAndIncrementInlineOffset($DWORD)),
        flags                 => $self->_bytesToValue(3, $self->_readAndIncrementInlineOffset($DWORD)),
        streamNumber          => $self->_bytesToValue(5, $self->_readAndIncrementInlineOffset($WORD)),
        streamLanguageID      => $self->_bytesToValue(5, $self->_readAndIncrementInlineOffset($WORD)),
        averageTimePerFrame   => $self->_bytesToValue(4, $self->_readAndIncrementInlineOffset($QWORD)),
        streamNameCount       => $self->_bytesToValue(5, $self->_readAndIncrementInlineOffset($WORD)),
        payloadExtensionCount => $self->_bytesToValue(5, $self->_readAndIncrementInlineOffset($WORD)),
    );

    for (my $s = 0; $s < $ext{'streamNameCount'}; $s++) {
        
        my $language = unpack('v', $self->_readAndIncrementInlineOffset($WORD)) || last;
        my $length   = unpack('v', $self->_readAndIncrementInlineOffset($WORD));

        $self->_readAndIncrementInlineOffset($length);
        $self->{'inlineOffset'} += 4;
    }

    for (my $p = 0; $p < $ext{'payloadExtensionCount'}; $p++) {
        
        $self->_readAndIncrementInlineOffset(18) || last;
        my $length = unpack('V', $self->_readAndIncrementInlineOffset($DWORD));

        $self->_readAndIncrementInlineOffset($length);
        $self->{'inlineOffset'} += 22;
    }

    if (($self->{'inlineOffset'} - $offset) < $size) {

        my $nextObjectGUID = _byteStringToGUID($self->_readAndIncrementInlineOffset($GUID));
        my $nextObjectName = $reversedGUIDs{$nextObjectGUID} || 'ASF_Unknown_Object';
        my $nextObjectSize = unpack('v', $self->_readAndIncrementInlineOffset($QWORD));

        if ($DEBUG) {
            print "extendedStreamPropertiesObject nextObjectGUID: [" . $nextObjectGUID . "]\n";
            print "extendedStreamPropertiesObject nextObjectName: [" . $nextObjectName . "]\n";
            print "extendedStreamPropertiesObject nextObjectSize: [" . $nextObjectSize . "]\n";
            print "\n";
        }

        if (defined $nextObjectName && $nextObjectName eq 'ASF_Stream_Properties_Object') {
            $self->_parseASFStreamPropertiesObject(1);
        }
    }
}

sub _parseASFHeaderExtensionObject {
    my $self = shift;

    my %ext = ();

    $ext{'reserved_1'}          = _byteStringToGUID($self->_readAndIncrementOffset($GUID));
    $ext{'reserved_2'}      = unpack('v', $self->_readAndIncrementOffset($WORD));

    $ext{'extension_data_size'} = unpack('V', $self->_readAndIncrementOffset($DWORD));
    $ext{'extension_data'}      = $self->_readAndIncrementOffset($ext{'extension_data_size'});

    # Set these so we can use a convience method.
    $self->{'inlineData'}       = $ext{'extension_data'};
    $self->{'inlineOffset'}     = 0;

    if ($DEBUG) {
        print "Working on an ASF_Header_Extension_Object:\n\n";
    }

    while ($self->{'inlineOffset'} < $ext{'extension_data_size'}) {

        my $nextObjectGUID = _byteStringToGUID($self->_readAndIncrementInlineOffset($GUID)) || last;
        my $nextObjectName = $reversedGUIDs{$nextObjectGUID} || 'ASF_Unknown_Object';
        my $nextObjectSize = unpack('v', $self->_readAndIncrementInlineOffset($QWORD));

        # some sanity checks
        next if $nextObjectSize == 0 || $nextObjectSize > $ext{'extension_data_size'};
        next unless defined $nextObjectName;

        if ($DEBUG) {
            print "\textensionObject nextObjectGUID: [$nextObjectGUID]\n";
            print "\textensionObject nextObjectName: [$nextObjectName]\n";
            print "\textensionObject nextObjectSize: [$nextObjectSize]\n";
            print "\n";
        }

        # We only handle this object type for now.
        if ($nextObjectName eq 'ASF_Metadata_Library_Object' ||
            $nextObjectName eq 'ASF_Metadata_Object') {

            my $content_count = unpack('v', $self->_readAndIncrementInlineOffset($WORD));

            if ($DEBUG) {
                print "\tContent Count: [$content_count]\n";
            }

            # Language List Index   WORD    16
            # Stream Number     WORD    16
            # Name Length       WORD    16
            # Data Type         WORD    16
            # Data Length       DWORD   32
            # Name          WCHAR   varies
            # Data          See below       varies
            for (my $id = 0; $id < $content_count; $id++) {

                my $language_list = unpack('v', $self->_readAndIncrementInlineOffset($WORD));
                my $stream_number = unpack('v', $self->_readAndIncrementInlineOffset($WORD));
                my $name_length   = unpack('v', $self->_readAndIncrementInlineOffset($WORD));
                my $data_type     = unpack('v', $self->_readAndIncrementInlineOffset($WORD));
                my $data_length   = unpack('V', $self->_readAndIncrementInlineOffset($DWORD));
                my $name          = _denull($self->_readAndIncrementInlineOffset($name_length));
                my $value         = $self->_bytesToValue($data_type, $self->_readAndIncrementInlineOffset($data_length));

                if ($name eq 'WM/Picture') {
        
                    $value = {
                        'TYPE' => 'image/jpg',
                        'DATA' => $value,
                    };
                }

                $ext{'content'}->{$id}->{'name'}  = $name;
                $ext{'content'}->{$id}->{'value'} = $value;

                if ($DEBUG) {
                    print "\t$nextObjectName: $id\n";
                    print "\t\tname   = $name\n";
                    print "\t\tvalue  = $value\n";
                    print "\t\ttype   = $data_type\n";
                    print "\t\tlength = $data_length\n";
                    print "\n";
                }
            }

        } elsif ($nextObjectName eq 'ASF_Extended_Stream_Properties_Object') {

            $self->_parseASFExtendedStreamPropertiesObject($nextObjectSize - $GUID - $QWORD);

        } else {

            # Only increment the offset if we couldn't parse the object.
            $self->{'inlineOffset'} += ($nextObjectSize - $GUID - $QWORD);
        }
    }

    delete $ext{'extension_data'};
    delete $self->{'inlineData'};
    delete $self->{'inlineOffset'};

    push @{$self->{'EXT'}}, \%ext;
}

sub _bytesToValue {
    my ($self, $data_type, $value) = @_;

    # 0x0000 Unicode string. The data consists of a sequence of Unicode characters.
    #
    # 0x0001 BYTE array. The type of the data is implementation-specific.
    #
    # 0x0002 BOOL. The data is 2 bytes long and should be interpreted as a
    #        16-bit unsigned integer. Only 0x0000 or 0x0001 are permitted values.
    #
    # 0x0003 DWORD. The data is 4 bytes long - 32-bit unsigned integer.
    #
    # 0x0004 QWORD. The data is 8 bytes long - 64-bit unsigned integer.
    #
    # 0x0005 WORD. The data is 2 bytes long - 16-bit unsigned integer.
    #
    # 0x0006 GUID. The data is 16 bytes long - 128-bit GUID.

    if ($data_type == 0) {

        $value = _UTF16ToUTF8($value);

    } elsif ($data_type == 1) {

        # Leave byte arrays as is.

    } elsif ($data_type == 2 || $data_type == 5) {

        $value = unpack('v', $value);

    } elsif ($data_type == 3) {

        $value = unpack('V', $value);

    } elsif ($data_type == 4) {

        $value = _parse64BitString($value);

    } elsif ($data_type == 6) {

        $value = _byteStringToGUID($value);
    }

    return $value;
}

sub _parse64BitString {
    my ($low,$high) = unpack('VV', shift);

    return $high * 2 ** 32 + $low;
}

sub _knownGUIDs {

    my %guidMapping = (

        'ASF_Extended_Stream_Properties_Object'     => '14E6A5CB-C672-4332-8399-A96952065B5A',
        'ASF_Padding_Object'                => '1806D474-CADF-4509-A4BA-9AABCB96AAE8',
        'ASF_Payload_Ext_Syst_Pixel_Aspect_Ratio'   => '1B1EE554-F9EA-4BC8-821A-376B74E4C4B8',
        'ASF_Script_Command_Object'         => '1EFB1A30-0B62-11D0-A39B-00A0C90348F6',
        'ASF_No_Error_Correction'           => '20FB5700-5B55-11CF-A8FD-00805F5C442B',
        'ASF_Content_Branding_Object'           => '2211B3FA-BD23-11D2-B4B7-00A0C955FC6E',
        'ASF_Content_Encryption_Object'         => '2211B3FB-BD23-11D2-B4B7-00A0C955FC6E',
        'ASF_Digital_Signature_Object'          => '2211B3FC-BD23-11D2-B4B7-00A0C955FC6E',
        'ASF_Extended_Content_Encryption_Object'    => '298AE614-2622-4C17-B935-DAE07EE9289C',
        'ASF_Simple_Index_Object'           => '33000890-E5B1-11CF-89F4-00A0C90349CB',
        'ASF_Degradable_JPEG_Media'         => '35907DE0-E415-11CF-A917-00805F5C442B',
        'ASF_Payload_Extension_System_Timecode'     => '399595EC-8667-4E2D-8FDB-98814CE76C1E',
        'ASF_Binary_Media'              => '3AFB65E2-47EF-40F2-AC2C-70A90D71D343',
        'ASF_Timecode_Index_Object'         => '3CB73FD0-0C4A-4803-953D-EDF7B6228F0C',
        'ASF_Metadata_Library_Object'           => '44231C94-9498-49D1-A141-1D134E457054',
        'ASF_Reserved_3'                => '4B1ACBE3-100B-11D0-A39B-00A0C90348F6',
        'ASF_Reserved_4'                => '4CFEDB20-75F6-11CF-9C0F-00A0C90349CB',
        'ASF_Command_Media'             => '59DACFC0-59E6-11D0-A3AC-00A0C90348F6',
        'ASF_Header_Extension_Object'           => '5FBF03B5-A92E-11CF-8EE3-00C00C205365',
        'ASF_Media_Object_Index_Parameters_Obj'     => '6B203BAD-3F11-4E84-ACA8-D7613DE2CFA7',
        'ASF_Header_Object'             => '75B22630-668E-11CF-A6D9-00AA0062CE6C',
        'ASF_Content_Description_Object'        => '75B22633-668E-11CF-A6D9-00AA0062CE6C',
        'ASF_Error_Correction_Object'           => '75B22635-668E-11CF-A6D9-00AA0062CE6C',
        'ASF_Data_Object'               => '75B22636-668E-11CF-A6D9-00AA0062CE6C',
        'ASF_Web_Stream_Media_Subtype'          => '776257D4-C627-41CB-8F81-7AC7FF1C40CC',
        'ASF_Stream_Bitrate_Properties_Object'      => '7BF875CE-468D-11D1-8D82-006097C9A2B2',
        'ASF_Language_List_Object'          => '7C4346A9-EFE0-4BFC-B229-393EDE415C85',
        'ASF_Codec_List_Object'             => '86D15240-311D-11D0-A3A4-00A0C90348F6',
        'ASF_Reserved_2'                => '86D15241-311D-11D0-A3A4-00A0C90348F6',
        'ASF_File_Properties_Object'            => '8CABDCA1-A947-11CF-8EE4-00C00C205365',
        'ASF_File_Transfer_Media'           => '91BD222C-F21C-497A-8B6D-5AA86BFC0185',
        'ASF_Advanced_Mutual_Exclusion_Object'      => 'A08649CF-4775-4670-8A16-6E35357566CD',
        'ASF_Bandwidth_Sharing_Object'          => 'A69609E6-517B-11D2-B6AF-00C04FD908E9',
        'ASF_Reserved_1'                => 'ABD3D211-A9BA-11cf-8EE6-00C00C205365',
        'ASF_Bandwidth_Sharing_Exclusive'       => 'AF6060AA-5197-11D2-B6AF-00C04FD908E9',
        'ASF_Bandwidth_Sharing_Partial'         => 'AF6060AB-5197-11D2-B6AF-00C04FD908E9',
        'ASF_JFIF_Media'                => 'B61BE100-5B4E-11CF-A8FD-00805F5C442B',
        'ASF_Stream_Properties_Object'          => 'B7DC0791-A9B7-11CF-8EE6-00C00C205365',
        'ASF_Video_Media'               => 'BC19EFC0-5B4D-11CF-A8FD-00805F5C442B',
        'ASF_Audio_Spread'              => 'BFC3CD50-618F-11CF-8BB2-00AA00B4E220',
        'ASF_Metadata_Object'               => 'C5F8CBEA-5BAF-4877-8467-AA8C44FA4CCA',
        'ASF_Payload_Ext_Syst_Sample_Duration'      => 'C6BD9450-867F-4907-83A3-C77921B733AD',
        'ASF_Group_Mutual_Exclusion_Object'     => 'D1465A40-5A79-4338-B71B-E36B8FD6C249',
        'ASF_Extended_Content_Description_Object'   => 'D2D0A440-E307-11D2-97F0-00A0C95EA850',
        'ASF_Stream_Prioritization_Object'      => 'D4FED15B-88D3-454F-81F0-ED5C45999E24',
        'ASF_Payload_Ext_System_Content_Type'       => 'D590DC20-07BC-436C-9CF7-F3BBFBF1A4DC',
        'ASF_Index_Object'              => 'D6E229D3-35DA-11D1-9034-00A0C90349BE',
        'ASF_Bitrate_Mutual_Exclusion_Object'       => 'D6E229DC-35DA-11D1-9034-00A0C90349BE',
        'ASF_Index_Parameters_Object'           => 'D6E229DF-35DA-11D1-9034-00A0C90349BE',
        'ASF_Mutex_Language'                => 'D6E22A00-35DA-11D1-9034-00A0C90349BE',
        'ASF_Mutex_Bitrate'             => 'D6E22A01-35DA-11D1-9034-00A0C90349BE',
        'ASF_Mutex_Unknown'             => 'D6E22A02-35DA-11D1-9034-00A0C90349BE',
        'ASF_Web_Stream_Format'             => 'DA1E6B13-8359-4050-B398-388E965BF00C',
        'ASF_Payload_Ext_System_File_Name'      => 'E165EC0E-19ED-45D7-B4A7-25CBD1E28E9B',
        'ASF_Marker_Object'             => 'F487CD01-A951-11CF-8EE6-00C00C205365',
        'ASF_Timecode_Index_Parameters_Object'      => 'F55E496D-9797-4B5D-8C8B-604DFE9BFB24',
        'ASF_Audio_Media'               => 'F8699E40-5B4D-11CF-A8FD-00805F5C442B',
        'ASF_Media_Object_Index_Object'         => 'FEB103F8-12AD-4C64-840F-2A1D2F7AD48C',
        'ASF_Alt_Extended_Content_Encryption_Obj'   => 'FF889EF1-ADEE-40DA-9E71-98704BB928CE',
        'ASF_Index_Placeholder_Object'          => 'D9AADE20-7C17-4F9C-BC28-8555DD98E2A2',
        'ASF_Compatibility_Object'          => '26F18B5D-4584-47EC-9F5F-0E651F0452C9',
    );

    return %guidMapping;
}

sub _knownParsers {
    
    return (
        'ASF_File_Properties_Object'              => \&_parseASFFilePropertiesObject,
        'ASF_Content_Description_Object'          => \&_parseASFContentDescriptionObject,
        'ASF_Stream_Bitrate_Properties_Object'    => \&_parseASFStreamBitratePropertiesObject,
        
        # We don't currently use most of these, so no point in spending time parsing them
        #'ASF_Extended_Content_Description_Object' => \&_parseASFExtendedContentDescriptionObject,
        #'ASF_Content_Encryption_Object'           => \&_parseASFContentEncryptionObject,
        #'ASF_Extended_Content_Encryption_Object'  => \&_parseASFContentEncryptionObject,
        #'ASF_Stream_Properties_Object'            => \&_parseASFStreamPropertiesObject,
    );
}

sub _RIFFwFormatTagLookup {
    my $wFormatTag = shift;

    my %formatTags = (
        0x0000 => 'Microsoft Unknown Wave Format',
        0x0001 => 'Pulse Code Modulation (PCM)',
        0x0002 => 'Microsoft ADPCM',
        0x0003 => 'IEEE Float',
        0x0004 => 'Compaq Computer VSELP',
        0x0005 => 'IBM CVSD',
        0x0006 => 'Microsoft A-Law',
        0x0007 => 'Microsoft mu-Law',
        0x0008 => 'Microsoft DTS',
        0x0010 => 'OKI ADPCM',
        0x0011 => 'Intel DVI/IMA ADPCM',
        0x0012 => 'Videologic MediaSpace ADPCM',
        0x0013 => 'Sierra Semiconductor ADPCM',
        0x0014 => 'Antex Electronics G.723 ADPCM',
        0x0015 => 'DSP Solutions DigiSTD',
        0x0016 => 'DSP Solutions DigiFIX',
        0x0017 => 'Dialogic OKI ADPCM',
        0x0018 => 'MediaVision ADPCM',
        0x0019 => 'Hewlett-Packard CU',
        0x0020 => 'Yamaha ADPCM',
        0x0021 => 'Speech Compression Sonarc',
        0x0022 => 'DSP Group TrueSpeech',
        0x0023 => 'Echo Speech EchoSC1',
        0x0024 => 'Audiofile AF36',
        0x0025 => 'Audio Processing Technology APTX',
        0x0026 => 'AudioFile AF10',
        0x0027 => 'Prosody 1612',
        0x0028 => 'LRC',
        0x0030 => 'Dolby AC2',
        0x0031 => 'Microsoft GSM 6.10',
        0x0032 => 'MSNAudio',
        0x0033 => 'Antex Electronics ADPCME',
        0x0034 => 'Control Resources VQLPC',
        0x0035 => 'DSP Solutions DigiREAL',
        0x0036 => 'DSP Solutions DigiADPCM',
        0x0037 => 'Control Resources CR10',
        0x0038 => 'Natural MicroSystems VBXADPCM',
        0x0039 => 'Crystal Semiconductor IMA ADPCM',
        0x003A => 'EchoSC3',
        0x003B => 'Rockwell ADPCM',
        0x003C => 'Rockwell Digit LK',
        0x003D => 'Xebec',
        0x0040 => 'Antex Electronics G.721 ADPCM',
        0x0041 => 'G.728 CELP',
        0x0042 => 'MSG723',
        0x0050 => 'MPEG Layer-2 or Layer-1',
        0x0052 => 'RT24',
        0x0053 => 'PAC',
        0x0055 => 'MPEG Layer-3',
        0x0059 => 'Lucent G.723',
        0x0060 => 'Cirrus',
        0x0061 => 'ESPCM',
        0x0062 => 'Voxware',
        0x0063 => 'Canopus Atrac',
        0x0064 => 'G.726 ADPCM',
        0x0065 => 'G.722 ADPCM',
        0x0066 => 'DSAT',
        0x0067 => 'DSAT Display',
        0x0069 => 'Voxware Byte Aligned',
        0x0070 => 'Voxware AC8',
        0x0071 => 'Voxware AC10',
        0x0072 => 'Voxware AC16',
        0x0073 => 'Voxware AC20',
        0x0074 => 'Voxware MetaVoice',
        0x0075 => 'Voxware MetaSound',
        0x0076 => 'Voxware RT29HW',
        0x0077 => 'Voxware VR12',
        0x0078 => 'Voxware VR18',
        0x0079 => 'Voxware TQ40',
        0x0080 => 'Softsound',
        0x0081 => 'Voxware TQ60',
        0x0082 => 'MSRT24',
        0x0083 => 'G.729A',
        0x0084 => 'MVI MV12',
        0x0085 => 'DF G.726',
        0x0086 => 'DF GSM610',
        0x0088 => 'ISIAudio',
        0x0089 => 'Onlive',
        0x0091 => 'SBC24',
        0x0092 => 'Dolby AC3 SPDIF',
        0x0093 => 'MediaSonic G.723',
        0x0094 => 'Aculab PLC    Prosody 8kbps',
        0x0097 => 'ZyXEL ADPCM',
        0x0098 => 'Philips LPCBB',
        0x0099 => 'Packed',
        0x00FF => 'AAC',
        0x0100 => 'Rhetorex ADPCM',
        0x0101 => 'IBM mu-law',
        0x0102 => 'IBM A-law',
        0x0103 => 'IBM AVC Adaptive Differential Pulse Code Modulation (ADPCM)',
        0x0111 => 'Vivo G.723',
        0x0112 => 'Vivo Siren',
        0x0123 => 'Digital G.723',
        0x0125 => 'Sanyo LD ADPCM',
        0x0130 => 'Sipro Lab Telecom ACELP NET',
        0x0131 => 'Sipro Lab Telecom ACELP 4800',
        0x0132 => 'Sipro Lab Telecom ACELP 8V3',
        0x0133 => 'Sipro Lab Telecom G.729',
        0x0134 => 'Sipro Lab Telecom G.729A',
        0x0135 => 'Sipro Lab Telecom Kelvin',
        0x0140 => 'Windows Media Video V8',
        0x0150 => 'Qualcomm PureVoice',
        0x0151 => 'Qualcomm HalfRate',
        0x0155 => 'Ring Zero Systems TUB GSM',
        0x0160 => 'Microsoft Audio 1',
        0x0161 => 'Windows Media Audio V7 / V8 / V9',
        0x0162 => 'Windows Media Audio Professional V9',
        0x0163 => 'Windows Media Audio Lossless V9',
        0x0200 => 'Creative Labs ADPCM',
        0x0202 => 'Creative Labs Fastspeech8',
        0x0203 => 'Creative Labs Fastspeech10',
        0x0210 => 'UHER Informatic GmbH ADPCM',
        0x0220 => 'Quarterdeck',
        0x0230 => 'I-link Worldwide VC',
        0x0240 => 'Aureal RAW Sport',
        0x0250 => 'Interactive Products HSX',
        0x0251 => 'Interactive Products RPELP',
        0x0260 => 'Consistent Software CS2',
        0x0270 => 'Sony SCX',
        0x0300 => 'Fujitsu FM Towns Snd',
        0x0400 => 'BTV Digital',
        0x0401 => 'Intel Music Coder',
        0x0450 => 'QDesign Music',
        0x0680 => 'VME VMPCM',
        0x0681 => 'AT&T Labs TPC',
        0x08AE => 'ClearJump LiteWave',
        0x1000 => 'Olivetti GSM',
        0x1001 => 'Olivetti ADPCM',
        0x1002 => 'Olivetti CELP',
        0x1003 => 'Olivetti SBC',
        0x1004 => 'Olivetti OPR',
        0x1100 => 'Lernout & Hauspie Codec (0x1100)',
        0x1101 => 'Lernout & Hauspie CELP Codec (0x1101)',
        0x1102 => 'Lernout & Hauspie SBC Codec (0x1102)',
        0x1103 => 'Lernout & Hauspie SBC Codec (0x1103)',
        0x1104 => 'Lernout & Hauspie SBC Codec (0x1104)',
        0x1400 => 'Norris',
        0x1401 => 'AT&T ISIAudio',
        0x1500 => 'Soundspace Music Compression',
        0x181C => 'VoxWare RT24 Speech',
        0x1FC4 => 'NCT Soft ALF2CD (www.nctsoft.com)',
        0x2000 => 'Dolby AC3',
        0x2001 => 'Dolby DTS',
        0x2002 => 'WAVE_FORMAT_14_4',
        0x2003 => 'WAVE_FORMAT_28_8',
        0x2004 => 'WAVE_FORMAT_COOK',
        0x2005 => 'WAVE_FORMAT_DNET',
        0x674F => 'Ogg Vorbis 1',
        0x6750 => 'Ogg Vorbis 2',
        0x6751 => 'Ogg Vorbis 3',
        0x676F => 'Ogg Vorbis 1+',
        0x6770 => 'Ogg Vorbis 2+',
        0x6771 => 'Ogg Vorbis 3+',
        0x7A21 => 'GSM-AMR (CBR, no SID)',
        0x7A22 => 'GSM-AMR (VBR, including SID)',
        0xFFFE => 'WAVE_FORMAT_EXTENSIBLE',
        0xFFFF => 'WAVE_FORMAT_DEVELOPMENT',
    );

    return $formatTags{$wFormatTag};
}

sub _guidToByteString {
    my $guidString  = shift;

    # Microsoft defines these 16-byte (128-bit) GUIDs as:
    # first 4 bytes are in little-endian order
    # next 2 bytes are appended in little-endian order
    # next 2 bytes are appended in little-endian order
    # next 2 bytes are appended in big-endian order
    # next 6 bytes are appended in big-endian order

    # AaBbCcDd-EeFf-GgHh-IiJj-KkLlMmNnOoPp is stored as this 16-byte string:
    # $Dd $Cc $Bb $Aa $Ff $Ee $Hh $Gg $Ii $Jj $Kk $Ll $Mm $Nn $Oo $Pp

    my $hexByteCharString;

    $hexByteCharString  = chr(hex(substr($guidString,  6, 2)));
    $hexByteCharString .= chr(hex(substr($guidString,  4, 2)));
    $hexByteCharString .= chr(hex(substr($guidString,  2, 2)));
    $hexByteCharString .= chr(hex(substr($guidString,  0, 2)));

    $hexByteCharString .= chr(hex(substr($guidString, 11, 2)));
    $hexByteCharString .= chr(hex(substr($guidString,  9, 2)));

    $hexByteCharString .= chr(hex(substr($guidString, 16, 2)));
    $hexByteCharString .= chr(hex(substr($guidString, 14, 2)));

    $hexByteCharString .= chr(hex(substr($guidString, 19, 2)));
    $hexByteCharString .= chr(hex(substr($guidString, 21, 2)));

    $hexByteCharString .= chr(hex(substr($guidString, 24, 2)));
    $hexByteCharString .= chr(hex(substr($guidString, 26, 2)));
    $hexByteCharString .= chr(hex(substr($guidString, 28, 2)));
    $hexByteCharString .= chr(hex(substr($guidString, 30, 2)));
    $hexByteCharString .= chr(hex(substr($guidString, 32, 2)));
    $hexByteCharString .= chr(hex(substr($guidString, 34, 2)));

    return $hexByteCharString;
}

sub _byteStringToGUID {
    my @byteString  = split //, shift;

    my $guidString;
    
    return unless @byteString;

    # this reverses _guidToByteString.
    $guidString  = sprintf("%02X", ord($byteString[3]));
    $guidString .= sprintf("%02X", ord($byteString[2]));
    $guidString .= sprintf("%02X", ord($byteString[1]));
    $guidString .= sprintf("%02X", ord($byteString[0]));
    $guidString .= '-';
    $guidString .= sprintf("%02X", ord($byteString[5]));
    $guidString .= sprintf("%02X", ord($byteString[4]));
    $guidString .= '-';
    $guidString .= sprintf("%02X", ord($byteString[7]));
    $guidString .= sprintf("%02X", ord($byteString[6]));
    $guidString .= '-';
    $guidString .= sprintf("%02X", ord($byteString[8]));
    $guidString .= sprintf("%02X", ord($byteString[9]));
    $guidString .= '-';
    $guidString .= sprintf("%02X", ord($byteString[10]));
    $guidString .= sprintf("%02X", ord($byteString[11]));
    $guidString .= sprintf("%02X", ord($byteString[12]));
    $guidString .= sprintf("%02X", ord($byteString[13]));
    $guidString .= sprintf("%02X", ord($byteString[14]));
    $guidString .= sprintf("%02X", ord($byteString[15]));

    return uc($guidString);
}

sub _fileTimeToUnixTime {
    my $filetime    = shift;
    my $round   = shift || 1;

    # filetime is a 64-bit unsigned integer representing
    # the number of 100-nanosecond intervals since January 1, 1601
    # UNIX timestamp is number of seconds since January 1, 1970
    # 116444736000000000 = 10000000 * 60 * 60 * 24 * 365 * 369 + 89 leap days
    if ($round) {
        return int(($filetime - 116444736000000000) / 10000000);
    }

    return ($filetime - 116444736000000000) / 10000000;
}

1;

__END__

=head1 NAME

Audio::WMA - Perl extension for reading WMA/ASF Metadata

=head1 SYNOPSIS

    use Audio::WMA;

    my $wma  = Audio::WMA->new($file);

    my $info = $wma->info();

    foreach (keys %$info) {
                print "$_: $info->{$_}\n";
        }

    my $tags = $wma->tags();

        foreach (keys %$tags) {
                print "$_: $tags->{$_}\n";
        }

=head1 DESCRIPTION

This module implements access to metadata contained in WMA files.

=head1 METHODS

=over 4

=item * new( $file )

Create a new Audio::WMA instance from the data in $file

=item * info( )

Get the audio data information in the form of a hash ref.

=item * tags( )

Get the metadata / tag information in the form of a hash ref.

=item * stream( )

Get the current ASF stream.

=item * parseObject( $asf )

Parse a standalone ASF object.

=item * setDebug( 0 | 1 )

Toggle debugging.

=item * setConvertTagsToUTF8( 0 | 1 )

Toggle Encoding metadata tags as UTF-8

Toggle debugging.

=back

=head1 SEE ALSO

Audio::FLAC::Header, L<http://getid3.sf.net/>

=head1 AUTHOR

Dan Sully, E<lt>daniel@cpan.orgE<gt>

=head1 COPYRIGHT AND LICENSE

Copyright 2003-2007 by Dan Sully & Slim Devices, Inc.

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself. 

=cut

BALA · January 10, 2007

So did you solve your problem, or do you still need help?

nobbe · January 10, 2007

hi

this was perl , i need help to do this in autoit

for now i compiled the perl as exe and used in autoit (not so efficient but works)

thanks

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