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        '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',
        0x000A => 'Windows Media Audio 9 Voice',
        0x000B => 'Microsoft Windows Media RT Voice Audio',
        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',