// ***************************************************************** -*- C++ -*-
/*
 * Copyright (C) 2004-2013 Andreas Huggel <ahuggel@gmx.net>
 *
 * This program is part of the Exiv2 distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, 5th Floor, Boston, MA 02110-1301 USA.
 */
/*
  File:      riffvideo.cpp
  Version:   $Rev$
  Author(s): Abhinav Badola for GSoC 2012 (AB) <mail.abu.to@gmail.com>
  History:   18-Jun-12, AB: created
  Credits:   See header file
 */
// *****************************************************************************
#include "rcsid_int.hpp"
EXIV2_RCSID("@(#) $Id$")

// *****************************************************************************
// included header files
#include "riffvideo.hpp"
#include "futils.hpp"
#include "basicio.hpp"
#include "tags.hpp"
#include "tags_int.hpp"
#include "types.hpp"
#include "tiffimage_int.hpp"
// + standard includes
#include <cmath>

// *****************************************************************************
// class member definitions
namespace Exiv2 {
    namespace Internal {

    /*!
      @brief Dummy TIFF header structure.
     */
    class DummyTiffHeader : public TiffHeaderBase {
    public:
        //! @name Creators
        //@{
        //! Default constructor
        DummyTiffHeader(ByteOrder byteOrder);
        //! Destructor
        ~DummyTiffHeader();
        //@}

        //! @name Manipulators
        //@{
        //! Dummy read function. Does nothing and returns true.
        bool read(const byte* pData, uint32_t size);
        //@}

    }; // class TiffHeader

    DummyTiffHeader::DummyTiffHeader(ByteOrder byteOrder)
        : TiffHeaderBase(42, 0, byteOrder, 0)
    {
    }

    DummyTiffHeader::~DummyTiffHeader()
    {
    }

    bool DummyTiffHeader::read(const byte* /*pData*/, uint32_t /*size*/)
    {
        return true;
    }

    extern const TagVocabulary infoTags[] =  {
        {   "AGES", "Xmp.video.Rated" },
        {   "CMNT", "Xmp.video.Comment" },
        {   "CODE", "Xmp.video.EncodedBy" },
        {   "COMM", "Xmp.video.Comment" },
        {   "DIRC", "Xmp.video.Director" },
        {   "DISP", "Xmp.audio.SchemeTitle" },
        {   "DTIM", "Xmp.video.DateTimeOriginal" },
        {   "GENR", "Xmp.video.Genre" },
        {   "IARL", "Xmp.video.ArchivalLocation" },
        {   "IART", "Xmp.video.Artist" },
        {   "IAS1", "Xmp.video.Edit1" },
        {   "IAS2", "Xmp.video.Edit2" },
        {   "IAS3", "Xmp.video.Edit3" },
        {   "IAS4", "Xmp.video.Edit4" },
        {   "IAS5", "Xmp.video.Edit5" },
        {   "IAS6", "Xmp.video.Edit6" },
        {   "IAS7", "Xmp.video.Edit7" },
        {   "IAS8", "Xmp.video.Edit8" },
        {   "IAS9", "Xmp.video.Edit9" },
        {   "IBSU", "Xmp.video.BaseURL" },
        {   "ICAS", "Xmp.audio.DefaultStream" },
        {   "ICDS", "Xmp.video.CostumeDesigner" },
        {   "ICMS", "Xmp.video.Commissioned" },
        {   "ICMT", "Xmp.video.Comment" },
        {   "ICNM", "Xmp.video.Cinematographer" },
        {   "ICNT", "Xmp.video.Country" },
        {   "ICOP", "Xmp.video.Copyright" },
        {   "ICRD", "Xmp.video.DateTimeDigitized" },
        {   "ICRP", "Xmp.video.Cropped" },
        {   "IDIM", "Xmp.video.Dimensions	" },
        {   "IDPI", "Xmp.video.DotsPerInch" },
        {   "IDST", "Xmp.video.DistributedBy" },
        {   "IEDT", "Xmp.video.EditedBy" },
        {   "IENC", "Xmp.video.EncodedBy" },
        {   "IENG", "Xmp.video.Engineer" },
        {   "IGNR", "Xmp.video.Genre" },
        {   "IKEY", "Xmp.video.PerformerKeywords" },
        {   "ILGT", "Xmp.video.Lightness" },
        {   "ILGU", "Xmp.video.LogoURL" },
        {   "ILIU", "Xmp.video.LogoIconURL" },
        {   "ILNG", "Xmp.video.Language" },
        {   "IMBI", "Xmp.video.InfoBannerImage" },
        {   "IMBU", "Xmp.video.InfoBannerURL" },
        {   "IMED", "Xmp.video.Medium" },
        {   "IMIT", "Xmp.video.InfoText" },
        {   "IMIU", "Xmp.video.InfoURL" },
        {   "IMUS", "Xmp.video.MusicBy" },
        {   "INAM", "Xmp.video.Title" },
        {   "IPDS", "Xmp.video.ProductionDesigner" },
        {   "IPLT", "Xmp.video.NumOfColors" },
        {   "IPRD", "Xmp.video.Product" },
        {   "IPRO", "Xmp.video.ProducedBy" },
        {   "IRIP", "Xmp.video.RippedBy" },
        {   "IRTD", "Xmp.video.Rating" },
        {   "ISBJ", "Xmp.video.Subject" },
        {   "ISFT", "Xmp.video.Software" },
        {   "ISGN", "Xmp.video.SecondaryGenre" },
        {   "ISHP", "Xmp.video.Sharpness" },
        {   "ISRC", "Xmp.video.Source" },
        {   "ISRF", "Xmp.video.SourceForm" },
        {   "ISTD", "Xmp.video.ProductionStudio" },
        {   "ISTR", "Xmp.video.Starring" },
        {   "ITCH", "Xmp.video.Technician" },
        {   "IWMU", "Xmp.video.WatermarkURL" },
        {   "IWRI", "Xmp.video.WrittenBy" },
        {   "LANG", "Xmp.video.Language" },
        {   "LOCA", "Xmp.video.LocationInfo" },
        {   "PRT1", "Xmp.video.Part" },
        {   "PRT2", "Xmp.video.NumOfParts" },
        {   "RATE", "Xmp.video.Rate" },
        {   "STAR", "Xmp.video.Starring" },
        {   "STAT", "Xmp.video.Statistics" },
        {   "TAPE", "Xmp.video.TapeName" },
        {   "TCDO", "Xmp.video.EndTimecode" },
        {   "TCOD", "Xmp.video.StartTimecode" },
        {   "TITL", "Xmp.video.Title" },
        {   "TLEN", "Xmp.video.Length" },
        {   "TORG", "Xmp.video.Organization" },
        {   "TRCK", "Xmp.video.TrackNumber" },
        {   "TURL", "Xmp.video.URL" },
        {   "TVER", "Xmp.video.SoftwareVersion" },
        {   "VMAJ", "Xmp.video.VegasVersionMajor" },
        {   "VMIN", "Xmp.video.VegasVersionMinor" },
        {   "YEAR", "Xmp.video.Year" }
    };

    extern const TagDetails audioEncodingValues[] =  {
        {   0x1, "Microsoft PCM" },
        {   0x2, "Microsoft ADPCM" },
        {   0x3, "Microsoft IEEE float" },
        {   0x4, "Compaq VSELP" },
        {   0x5, "IBM CVSD" },
        {   0x6, "Microsoft a-Law" },
        {   0x7, "Microsoft u-Law" },
        {   0x8, "Microsoft DTS" },
        {   0x9, "DRM" },
        {   0xa, "WMA 9 Speech" },
        {   0xb, "Microsoft Windows Media RT Voice" },
        {   0x10, "OKI-ADPCM" },
        {   0x11, "Intel IMA/DVI-ADPCM" },
        {   0x12, "Videologic Mediaspace ADPCM" },
        {   0x13, "Sierra ADPCM" },
        {   0x14, "Antex G.723 ADPCM" },
        {   0x15, "DSP Solutions DIGISTD" },
        {   0x16, "DSP Solutions DIGIFIX" },
        {   0x17, "Dialoic OKI ADPCM" },
        {   0x18, "Media Vision ADPCM" },
        {   0x19, "HP CU" },
        {   0x1a, "HP Dynamic Voice" },
        {   0x20, "Yamaha ADPCM" },
        {   0x21, "SONARC Speech Compression" },
        {   0x22, "DSP Group True Speech" },
        {   0x23, "Echo Speech Corp." },
        {   0x24, "Virtual Music Audiofile AF36" },
        {   0x25, "Audio Processing Tech." },
        {   0x26, "Virtual Music Audiofile AF10" },
        {   0x27, "Aculab Prosody 1612" },
        {   0x28, "Merging Tech. LRC" },
        {   0x30, "Dolby AC2" },
        {   0x31, "Microsoft GSM610" },
        {   0x32, "MSN Audio" },
        {   0x33, "Antex ADPCME" },
        {   0x34, "Control Resources VQLPC" },
        {   0x35, "DSP Solutions DIGIREAL" },
        {   0x36, "DSP Solutions DIGIADPCM" },
        {   0x37, "Control Resources CR10" },
        {   0x38, "Natural MicroSystems VBX ADPCM" },
        {   0x39, "Crystal Semiconductor IMA ADPCM" },
        {   0x3a, "Echo Speech ECHOSC3" },
        {   0x3b, "Rockwell ADPCM" },
        {   0x3c, "Rockwell DIGITALK" },
        {   0x3d, "Xebec Multimedia" },
        {   0x40, "Antex G.721 ADPCM" },
        {   0x41, "Antex G.728 CELP" },
        {   0x42, "Microsoft MSG723" },
        {   0x43, "IBM AVC ADPCM" },
        {   0x45, "ITU-T G.726" },
        {   0x50, "Microsoft MPEG" },
        {   0x51, "RT23 or PAC" },
        {   0x52, "InSoft RT24" },
        {   0x53, "InSoft PAC" },
        {   0x55, "MP3" },
        {   0x59, "Cirrus" },
        {   0x60, "Cirrus Logic" },
        {   0x61, "ESS Tech. PCM" },
        {   0x62, "Voxware Inc." },
        {   0x63, "Canopus ATRAC" },
        {   0x64, "APICOM G.726 ADPCM" },
        {   0x65, "APICOM G.722 ADPCM" },
        {   0x66, "Microsoft DSAT" },
        {   0x67, "Micorsoft DSAT DISPLAY" },
        {   0x69, "Voxware Byte Aligned" },
        {   0x70, "Voxware AC8" },
        {   0x71, "Voxware AC10" },
        {   0x72, "Voxware AC16" },
        {   0x73, "Voxware AC20" },
        {   0x74, "Voxware MetaVoice" },
        {   0x75, "Voxware MetaSound" },
        {   0x76, "Voxware RT29HW" },
        {   0x77, "Voxware VR12" },
        {   0x78, "Voxware VR18" },
        {   0x79, "Voxware TQ40" },
        {   0x7a, "Voxware SC3" },
        {   0x7b, "Voxware SC3" },
        {   0x80, "Soundsoft" },
        {   0x81, "Voxware TQ60" },
        {   0x82, "Microsoft MSRT24" },
        {   0x83, "AT&T G.729A" },
        {   0x84, "Motion Pixels MVI MV12" },
        {   0x85, "DataFusion G.726" },
        {   0x86, "DataFusion GSM610" },
        {   0x88, "Iterated Systems Audio" },
        {   0x89, "Onlive" },
        {   0x8a, "Multitude, Inc. FT SX20" },
        {   0x8b, "Infocom ITS A/S G.721 ADPCM" },
        {   0x8c, "Convedia G729" },
        {   0x8d, "Not specified congruency, Inc." },
        {   0x91, "Siemens SBC24" },
        {   0x92, "Sonic Foundry Dolby AC3 APDIF" },
        {   0x93, "MediaSonic G.723" },
        {   0x94, "Aculab Prosody 8kbps" },
        {   0x97, "ZyXEL ADPCM" },
        {   0x98, "Philips LPCBB" },
        {   0x99, "Studer Professional Audio Packed" },
        {   0xa0, "Malden PhonyTalk" },
        {   0xa1, "Racal Recorder GSM" },
        {   0xa2, "Racal Recorder G720.a" },
        {   0xa3, "Racal G723.1" },
        {   0xa4, "Racal Tetra ACELP" },
        {   0xb0, "NEC AAC NEC Corporation" },
        {   0xff, "AAC" },
        {   0x100, "Rhetorex ADPCM" },
        {   0x101, "IBM u-Law" },
        {   0x102, "IBM a-Law" },
        {   0x103, "IBM ADPCM" },
        {   0x111, "Vivo G.723" },
        {   0x112, "Vivo Siren" },
        {   0x120, "Philips Speech Processing CELP" },
        {   0x121, "Philips Speech Processing GRUNDIG" },
        {   0x123, "Digital G.723" },
        {   0x125, "Sanyo LD ADPCM" },
        {   0x130, "Sipro Lab ACEPLNET" },
        {   0x131, "Sipro Lab ACELP4800" },
        {   0x132, "Sipro Lab ACELP8V3" },
        {   0x133, "Sipro Lab G.729" },
        {   0x134, "Sipro Lab G.729A" },
        {   0x135, "Sipro Lab Kelvin" },
        {   0x136, "VoiceAge AMR" },
        {   0x140, "Dictaphone G.726 ADPCM" },
        {   0x150, "Qualcomm PureVoice" },
        {   0x151, "Qualcomm HalfRate" },
        {   0x155, "Ring Zero Systems TUBGSM" },
        {   0x160, "Microsoft Audio1" },
        {   0x161, "Windows Media Audio V2 V7 V8 V9 / DivX audio (WMA) / Alex AC3 Audio" },
        {   0x162, "Windows Media Audio Professional V9" },
        {   0x163, "Windows Media Audio Lossless V9" },
        {   0x164, "WMA Pro over S/PDIF" },
        {   0x170, "UNISYS NAP ADPCM" },
        {   0x171, "UNISYS NAP ULAW" },
        {   0x172, "UNISYS NAP ALAW" },
        {   0x173, "UNISYS NAP 16K" },
        {   0x174, "MM SYCOM ACM SYC008 SyCom Technologies" },
        {   0x175, "MM SYCOM ACM SYC701 G726L SyCom Technologies" },
        {   0x176, "MM SYCOM ACM SYC701 CELP54 SyCom Technologies" },
        {   0x177, "MM SYCOM ACM SYC701 CELP68 SyCom Technologies" },
        {   0x178, "Knowledge Adventure ADPCM" },
        {   0x180, "Fraunhofer IIS MPEG2AAC" },
        {   0x190, "Digital Theater Systems DTS DS" },
        {   0x200, "Creative Labs ADPCM" },
        {   0x202, "Creative Labs FASTSPEECH8" },
        {   0x203, "Creative Labs FASTSPEECH10" },
        {   0x210, "UHER ADPCM" },
        {   0x215, "Ulead DV ACM" },
        {   0x216, "Ulead DV ACM" },
        {   0x220, "Quarterdeck Corp." },
        {   0x230, "I-Link VC" },
        {   0x240, "Aureal Semiconductor Raw Sport" },
        {   0x241, "ESST AC3" },
        {   0x250, "Interactive Products HSX" },
        {   0x251, "Interactive Products RPELP" },
        {   0x260, "Consistent CS2" },
        {   0x270, "Sony SCX" },
        {   0x271, "Sony SCY" },
        {   0x272, "Sony ATRAC3" },
        {   0x273, "Sony SPC" },
        {   0x280, "TELUM Telum Inc." },
        {   0x281, "TELUMIA Telum Inc." },
        {   0x285, "Norcom Voice Systems ADPCM" },
        {   0x300, "Fujitsu FM TOWNS SND" },
        {   0x301, "Fujitsu (not specified)" },
        {   0x302, "Fujitsu (not specified)" },
        {   0x303, "Fujitsu (not specified)" },
        {   0x304, "Fujitsu (not specified)" },
        {   0x305, "Fujitsu (not specified)" },
        {   0x306, "Fujitsu (not specified)" },
        {   0x307, "Fujitsu (not specified)" },
        {   0x308, "Fujitsu (not specified)" },
        {   0x350, "Micronas Semiconductors, Inc. Development" },
        {   0x351, "Micronas Semiconductors, Inc. CELP833" },
        {   0x400, "Brooktree Digital" },
        {   0x401, "Intel Music Coder (IMC)" },
        {   0x402, "Ligos Indeo Audio" },
        {   0x450, "QDesign Music" },
        {   0x500, "On2 VP7 On2 Technologies" },
        {   0x501, "On2 VP6 On2 Technologies" },
        {   0x680, "AT&T VME VMPCM" },
        {   0x681, "AT&T TCP" },
        {   0x700, "YMPEG Alpha (dummy for MPEG-2 compressor)" },
        {   0x8ae, "ClearJump LiteWave (lossless)" },
        {   0x1000, "Olivetti GSM" },
        {   0x1001, "Olivetti ADPCM" },
        {   0x1002, "Olivetti CELP" },
        {   0x1003, "Olivetti SBC" },
        {   0x1004, "Olivetti OPR" },
        {   0x1100, "Lernout & Hauspie" },
        {   0x1101, "Lernout & Hauspie CELP codec" },
        {   0x1102, "Lernout & Hauspie SBC codec" },
        {   0x1103, "Lernout & Hauspie SBC codec" },
        {   0x1104, "Lernout & Hauspie SBC codec" },
        {   0x1400, "Norris Comm. Inc." },
        {   0x1401, "ISIAudio" },
        {   0x1500, "AT&T Soundspace Music Compression" },
        {   0x181c, "VoxWare RT24 speech codec" },
        {   0x181e, "Lucent elemedia AX24000P Music codec" },
        {   0x1971, "Sonic Foundry LOSSLESS" },
        {   0x1979, "Innings Telecom Inc. ADPCM" },
        {   0x1c07, "Lucent SX8300P speech codec" },
        {   0x1c0c, "Lucent SX5363S G.723 compliant codec" },
        {   0x1f03, "CUseeMe DigiTalk (ex-Rocwell)" },
        {   0x1fc4, "NCT Soft ALF2CD ACM" },
        {   0x2000, "FAST Multimedia DVM" },
        {   0x2001, "Dolby DTS (Digital Theater System)" },
        {   0x2002, "RealAudio 1 / 2 14.4" },
        {   0x2003, "RealAudio 1 / 2 28.8" },
        {   0x2004, "RealAudio G2 / 8 Cook (low bitrate)" },
        {   0x2005, "RealAudio 3 / 4 / 5 Music (DNET)" },
        {   0x2006, "RealAudio 10 AAC (RAAC)" },
        {   0x2007, "RealAudio 10 AAC+ (RACP)" },
        {   0x2500, "Reserved range to 0x2600 Microsoft" },
        {   0x3313, "makeAVIS (ffvfw fake AVI sound from AviSynth scripts)" },
        {   0x4143, "Divio MPEG-4 AAC audio" },
        {   0x4201, "Nokia adaptive multirate" },
        {   0x4243, "Divio G726 Divio, Inc." },
        {   0x434c, "LEAD Speech" },
        {   0x564c, "LEAD Vorbis" },
        {   0x5756, "WavPack Audio" },
        {   0x674f, "Ogg Vorbis (mode 1)" },
        {   0x6750, "Ogg Vorbis (mode 2)" },
        {   0x6751, "Ogg Vorbis (mode 3)" },
        {   0x676f, "Ogg Vorbis (mode 1+)" },
        {   0x6770, "Ogg Vorbis (mode 2+)" },
        {   0x6771, "Ogg Vorbis (mode 3+)" },
        {   0x7000, "3COM NBX 3Com Corporation" },
        {   0x706d, "FAAD AAC" },
        {   0x7a21, "GSM-AMR (CBR, no SID)" },
        {   0x7a22, "GSM-AMR (VBR, including SID)" },
        {   0xa100, "Comverse Infosys Ltd. G723 1" },
        {   0xa101, "Comverse Infosys Ltd. AVQSBC" },
        {   0xa102, "Comverse Infosys Ltd. OLDSBC" },
        {   0xa103, "Symbol Technologies G729A" },
        {   0xa104, "VoiceAge AMR WB VoiceAge Corporation" },
        {   0xa105, "Ingenient Technologies Inc. G726" },
        {   0xa106, "ISO/MPEG-4 advanced audio Coding" },
        {   0xa107, "Encore Software Ltd G726" },
        {   0xa109, "Speex ACM Codec xiph.org" },
        {   0xdfac, "DebugMode SonicFoundry Vegas FrameServer ACM Codec" },
        {   0xe708, "Unknown -" },
        {   0xf1ac, "Free Lossless Audio Codec FLAC" },
        {   0xfffe, "Extensible" },
        {   0xffff, "Development" }
    };

    extern const TagDetails nikonAVITags[] =  {
        {   0x0003, "Xmp.video.Make" },
        {   0x0004, "Xmp.video.Model" },
        {   0x0005, "Xmp.video.Software" },
        {   0x0006, "Xmp.video.Equipment" },
        {   0x0007, "Xmp.video.Orientation" },
        {   0x0008, "Xmp.video.ExposureTime" },
        {   0x0009, "Xmp.video.FNumber" },
        {   0x000a, "Xmp.video.ExposureCompensation" },
        {   0x000b, "Xmp.video.MaxApertureValue" },
        {   0x000c, "Xmp.video.MeteringMode" },
        {   0x000f, "Xmp.video.FocalLength" },
        {   0x0010, "Xmp.video.XResolution" },
        {   0x0011, "Xmp.video.YResolution" },
        {   0x0012, "Xmp.video.ResolutionUnit" },
        {   0x0013, "Xmp.video.DateTimeOriginal" },
        {   0x0014, "Xmp.video.DateTimeDigitized" },
        {   0x0016, "Xmp.video.duration" },
        {   0x0018, "Xmp.video.FocusMode" },
        {   0x001b, "Xmp.video.DigitalZoomRatio" },
        {   0x001d, "Xmp.video.ColorMode" },
        {   0x001e, "Xmp.video.Sharpness" },
        {   0x001f, "Xmp.video.WhiteBalance" },
        {   0x0020, "Xmp.video.ColorNoiseReduction" }
    };

    /*
    extern const TagDetails orientation[] =  {
        {   1, "Horizontal (normal)" },
        {   2, "Mirror horizontal" },
        {   3, "Rotate 180" },
        {   4, "Mirror vertical" },
        {   5, "Mirror horizontal and rotate 270 CW" },
        {   6, "Rotate 90 CW" },
        {   7, "Mirror horizontal and rotate 90 CW" },
        {   8, "Rotate 270 CW" }
    };
     */
    extern const TagDetails meteringMode[] =  {
        {   0, "Unknown" },
        {   1, "Average" },
        {   2, "Center-weighted average" },
        {   3, "Spot" },
        {   4, "Multi-spot" },
        {   5, "Multi-segment" },
        {   6, "Partial" },
        { 255, "Other" }
    };

    extern const TagDetails resolutionUnit[] =  {
        {   1, "None" },
        {   2, "inches" },
        {   3, "cm" }
    };

    /*!
      @brief Function used to check equality of a Tags with a
          particular string (ignores case while comparing).
      @param buf Data buffer that will contain Tag to compare
      @param str char* Pointer to string
      @return Returns true if the buffer value is equal to string.
     */
    bool equalsRiffTag(Exiv2::DataBuf& buf ,const char* str) {
        for(int i = 0; i < 4; i++ )
            if(toupper(buf.pData_[i]) != str[i])
                return false;
        return true;
    }

    enum streamTypeInfo {
        Audio = 1, MIDI, Text, Video
    };
    enum streamHeaderTags {
        codec = 1, sampleRate = 5, sampleCount = 8, quality = 10, sampleSize
    };
    enum bmptags {
        imageWidth, imageHeight, planes, bitDepth, compression, imageLength, pixelsPerMeterX, pixelsPerMeterY, numColors, numImportantColors
    };
    enum audioFormatTags {
        encoding, numberOfChannels, audioSampleRate, avgBytesPerSec = 4, bitsPerSample = 7
    };
    enum aviHeaderTags {
        frameRate, maxDataRate, frameCount = 4, streamCount = 6, imageWidth_h = 8, imageHeight_h
    };
}}                                      // namespace Internal, Exiv2

namespace Exiv2 {
    using namespace Exiv2::Internal;

    RiffVideo::RiffVideo(BasicIo::AutoPtr io)
            : Image(ImageType::riff, mdNone, io)
    {
    } // RiffVideo::RiffVideo

    std::string RiffVideo::mimeType() const
    {
        return "video/riff";
    }

    void RiffVideo::writeMetadata()
    {
    } // RiffVideo::writeMetadata

    void RiffVideo::readMetadata()
    {
        if (io_->open() != 0) throw Error(9, io_->path(), strError());

        // Ensure that this is the correct image type
        if (!isRiffType(*io_, false)) {
            if (io_->error() || io_->eof()) throw Error(14);
            throw Error(3, "RIFF");
        }

        IoCloser closer(*io_);
        clearMetadata();
        continueTraversing_ = true;

        xmpData_["Xmp.video.FileSize"] = (double)io_->size()/(double)1048576;
        xmpData_["Xmp.video.FileName"] = io_->path();
        xmpData_["Xmp.video.MimeType"] = mimeType();

        const long bufMinSize = 4;
        DataBuf buf(bufMinSize+1);
        buf.pData_[4] = '\0';

        io_->read(buf.pData_, bufMinSize);
        xmpData_["Xmp.video.Container"] = buf.pData_;

        io_->read(buf.pData_, bufMinSize);
        io_->read(buf.pData_, bufMinSize);
        xmpData_["Xmp.video.FileType"] = buf.pData_;

        while (continueTraversing_) decodeBlock();
    } // RiffVideo::readMetadata

    void RiffVideo::decodeBlock()
    {
        const long bufMinSize = 4;
        DataBuf buf(bufMinSize+1);
        DataBuf buf2(bufMinSize+1);
        unsigned long size = 0;
        buf.pData_[4] = '\0' ;
        buf2.pData_[4] = '\0' ;

        io_->read(buf2.pData_, 4);

        if(io_->eof() || equalsRiffTag(buf2, "MOVI") || equalsRiffTag(buf2, "DATA")) {
            continueTraversing_ = false;
            return;
        }
        else if(equalsRiffTag(buf2, "HDRL") || equalsRiffTag(buf2, "STRL")) {
            decodeBlock();
        }
        else {
            io_->read(buf.pData_, 4);
            size = Exiv2::getULong(buf.pData_, littleEndian);

        tagDecoder(buf2, size);
        }
    } // RiffVideo::decodeBlock

    void RiffVideo::tagDecoder(Exiv2::DataBuf& buf, unsigned long size)
    {
        uint64_t cur_pos = io_->tell();
        static bool listFlag = false, listEnd = false;

        if(equalsRiffTag(buf, "LIST")) {
            listFlag = true;
            listEnd = false;

            while((uint64_t)(io_->tell()) < cur_pos + size) decodeBlock();

            listEnd = true;
            io_->seek(cur_pos + size, BasicIo::beg);
        }
        else if(equalsRiffTag(buf, "JUNK") && listEnd) {
            junkHandler(size);
        }
        else if(equalsRiffTag(buf, "AVIH")) {
            listFlag = false;
            aviHeaderTagsHandler(size);
        }
        else if(equalsRiffTag(buf, "STRH")) {
            listFlag = false;
            streamHandler(size);
        }
        else if(equalsRiffTag(buf,"STRF") || equalsRiffTag(buf, "FMT ")) {
            listFlag = false;
            if(equalsRiffTag(buf,"FMT "))
                streamType_ = Audio;
            streamFormatHandler(size);
        }
        else if(equalsRiffTag(buf, "STRN")) {
            listFlag = false;
            dateTimeOriginal(size, 1);
        }
        else if(equalsRiffTag(buf, "STRD")) {
            listFlag = false;
            streamDataTagHandler(size);
        }
        else if(equalsRiffTag(buf, "IDIT")) {
            listFlag = false;
            dateTimeOriginal(size);
        }
        else if(equalsRiffTag(buf, "INFO")) {
            listFlag = false;
            infoTagsHandler();
        }
        else if(equalsRiffTag(buf, "NCDT")) {
            listFlag = false;
            nikonTagsHandler();
        }
        else if(equalsRiffTag(buf, "ODML")) {
            listFlag = false;
            odmlTagsHandler();
        }
        else if (listFlag) {
            // std::cout<<"|unprocessed|"<<buf.pData_;
            skipListData();
        }
        else {
            // std::cout<<"|unprocessed|"<<buf.pData_;
            io_->seek(cur_pos + size, BasicIo::beg);
        }
    } // RiffVideo::tagDecoder

    void RiffVideo::streamDataTagHandler(long size)
    {
        const long bufMinSize = 20000;
        DataBuf buf(bufMinSize);
        buf.pData_[4] = '\0';
        uint64_t cur_pos = io_->tell();

            io_->read(buf.pData_, 8);

             if(equalsRiffTag(buf, "AVIF")) {

                 if (size - 4 < 0) {
             #ifndef SUPPRESS_WARNINGS
                     EXV_ERROR   << " Exif Tags found in this RIFF file are not of valid size ."
                                 << " Entries considered invalid. Not Processed.\n";
             #endif
                 }
                 else {
                 io_->read(buf.pData_, size - 4);

                 IptcData iptcData;
                 XmpData  xmpData;
                 DummyTiffHeader tiffHeader(littleEndian);
                 TiffParserWorker::decode(exifData_,
                                          iptcData,
                                          xmpData,
                                          buf.pData_,
                                          buf.size_,
                                          Tag::root,
                                          TiffMapping::findDecoder,
                                          &tiffHeader);

         #ifndef SUPPRESS_WARNINGS
                 if (!iptcData.empty()) {
                     EXV_WARNING << "Ignoring IPTC information encoded in the Exif data.\n";
                 }
                 if (!xmpData.empty()) {
                     EXV_WARNING << "Ignoring XMP information encoded in the Exif data.\n";
                 }
         #endif
             }
             }
              // TODO decode CasioData and ZORA Tag
        io_->seek(cur_pos + size, BasicIo::beg);

    } // RiffVideo::streamDataTagHandler

    void RiffVideo::dateTimeOriginal(long size, int i)
    {
        uint64_t cur_pos = io_->tell();
        const long bufMinSize = 100;
        DataBuf buf(bufMinSize);
        io_->read(buf.pData_, size);
        if(!i)
            xmpData_["Xmp.video.DateUTC"] = buf.pData_;
        else
            xmpData_["Xmp.video.StreamName"] = buf.pData_;
        io_->seek(cur_pos + size, BasicIo::beg);
    } // RiffVideo::dateTimeOriginal

    void RiffVideo::odmlTagsHandler()
    {
        const long bufMinSize = 100;
        DataBuf buf(bufMinSize);
        buf.pData_[4] = '\0';
        io_->seek(-12, BasicIo::cur);
        io_->read(buf.pData_, 4);
        unsigned long size = Exiv2::getULong(buf.pData_, littleEndian);
        unsigned long size2 = size;

        uint64_t cur_pos = io_->tell();
        io_->read(buf.pData_, 4); size -= 4;

        while(size > 0) {
            io_->read(buf.pData_, 4); size -= 4;
            if(equalsRiffTag(buf,"DMLH")) {
                io_->read(buf.pData_, 4); size -= 4;
                io_->read(buf.pData_, 4); size -= 4;
                xmpData_["Xmp.video.TotalFrameCount"] = Exiv2::getULong(buf.pData_, littleEndian);
            }
        }
        io_->seek(cur_pos + size2, BasicIo::beg);
    } // RiffVideo::odmlTagsHandler

    void RiffVideo::skipListData()
    {
        const long bufMinSize = 4;
        DataBuf buf(bufMinSize+1);
        buf.pData_[4] = '\0';
        io_->seek(-12, BasicIo::cur);
        io_->read(buf.pData_, 4);
        unsigned long size = Exiv2::getULong(buf.pData_, littleEndian);

        uint64_t cur_pos = io_->tell();
        io_->seek(cur_pos + size, BasicIo::beg);
    } // RiffVideo::skipListData

    void RiffVideo::nikonTagsHandler()
    {
        const long bufMinSize = 100;
        DataBuf buf(bufMinSize), buf2(4+1);
        buf.pData_[4] = '\0';
        io_->seek(-12, BasicIo::cur);
        io_->read(buf.pData_, 4);

        long internal_size = 0, tagID = 0, dataSize = 0, tempSize, size = Exiv2::getULong(buf.pData_, littleEndian);
        tempSize = size; char str[9] = " . . . ";
        uint64_t internal_pos, cur_pos; internal_pos = cur_pos = io_->tell();
        const TagDetails* td;
        double denominator = 1;
        io_->read(buf.pData_, 4); tempSize -= 4;

        while((long)tempSize > 0) {
            std::memset(buf.pData_, 0x0, buf.size_);
            io_->read(buf.pData_, 4);
            io_->read(buf2.pData_, 4);
            int temp = internal_size = Exiv2::getULong(buf2.pData_, littleEndian);
            internal_pos = io_->tell(); tempSize -= (internal_size + 8);

            if(equalsRiffTag(buf, "NCVR")) {
                while((long)temp > 3) {
                    std::memset(buf.pData_, 0x0, buf.size_);
                    io_->read(buf.pData_, 2);
                    tagID = Exiv2::getULong(buf.pData_, littleEndian);
                    io_->read(buf.pData_, 2);
                    dataSize = Exiv2::getULong(buf.pData_, littleEndian);
                    temp -= (4 + dataSize);

                    if(tagID == 0x0001) {
                        if (dataSize <= 0) {
                    #ifndef SUPPRESS_WARNINGS
                            EXV_ERROR   << " Makernotes found in this RIFF file are not of valid size ."
                                        << " Entries considered invalid. Not Processed.\n";
                    #endif
                        }
                        else {
                        io_->read(buf.pData_, dataSize);
                        xmpData_["Xmp.video.MakerNoteType"] = buf.pData_;
                        }
                    }
                    else if (tagID == 0x0002) {
                        while(dataSize) {
                            std::memset(buf.pData_, 0x0, buf.size_); io_->read(buf.pData_, 1);
                            str[(4 - dataSize) * 2] = (char)(Exiv2::getULong(buf.pData_, littleEndian) + 48);
                            --dataSize;
                        }
                        xmpData_["Xmp.video.MakerNoteVersion"] = str;
                    }
                }
            }
            else if(equalsRiffTag(buf, "NCTG")) {
                while((long)temp > 3) {
                    std::memset(buf.pData_, 0x0, buf.size_);
                    io_->read(buf.pData_, 2);
                    tagID = Exiv2::getULong(buf.pData_, littleEndian);
                    io_->read(buf.pData_, 2);
                    dataSize = Exiv2::getULong(buf.pData_, littleEndian);
                    temp -= (4 + dataSize);
                    td = find(nikonAVITags , tagID);

                    if (dataSize <= 0) {
                #ifndef SUPPRESS_WARNINGS
                        EXV_ERROR   << " Makernotes found in this RIFF file are not of valid size ."
                                    << " Entries considered invalid. Not Processed.\n";
                #endif
                    }
                    else {
                    io_->read(buf.pData_, dataSize);

                    switch (tagID) {
                    case 0x0003: case 0x0004: case 0x0005: case 0x0006:
                    case 0x0013: case 0x0014: case 0x0018: case 0x001d:
                    case 0x001e: case 0x001f: case 0x0020:
                        xmpData_[exvGettext(td->label_)] = buf.pData_; break;

                    case 0x0007: case 0x0010: case 0x0011: case 0x000c:
                    case 0x0012:
                        xmpData_[exvGettext(td->label_)] = Exiv2::getULong(buf.pData_, littleEndian); break;

                    case 0x0008: case 0x0009: case 0x000a: case 0x000b:
                    case 0x000f: case 0x001b: case 0x0016:
                        buf2.pData_[0] = buf.pData_[4]; buf2.pData_[1] = buf.pData_[5];
                        buf2.pData_[2] = buf.pData_[6]; buf2.pData_[3] = buf.pData_[7];
                        denominator = (double)Exiv2::getLong(buf2.pData_, littleEndian);
                        if (denominator != 0)
                            xmpData_[exvGettext(td->label_)] = (double)Exiv2::getLong(buf.pData_, littleEndian) / denominator;
                        else
                            xmpData_[exvGettext(td->label_)] = 0;
                        break;

                    default:
                        break;
                    }
                    }
                }
            }

            else if(equalsRiffTag(buf, "NCTH")) {//TODO Nikon Thumbnail Image
            }

            else if(equalsRiffTag(buf, "NCVW")) {//TODO Nikon Preview Image
            }

            io_->seek(internal_pos + internal_size, BasicIo::beg);
        }

        if (size ==0) {
            io_->seek(cur_pos + 4, BasicIo::beg);
        }
        else {
            io_->seek(cur_pos + size, BasicIo::beg);
        }
    } // RiffVideo::nikonTagsHandler

    void RiffVideo::infoTagsHandler()
    {
        const long bufMinSize = 100;
        DataBuf buf(bufMinSize);
        buf.pData_[4] = '\0';
        io_->seek(-12, BasicIo::cur);
        io_->read(buf.pData_, 4);
        long infoSize, size = Exiv2::getULong(buf.pData_, littleEndian);
        long size_external = size;
        const TagVocabulary* tv;

        uint64_t cur_pos = io_->tell();
        io_->read(buf.pData_, 4); size -= 4;

        while(size > 3) {
            io_->read(buf.pData_, 4); size -= 4;
            if(!Exiv2::getULong(buf.pData_, littleEndian))
                break;
            tv = find(infoTags , Exiv2::toString( buf.pData_));
            io_->read(buf.pData_, 4); size -= 4;
            infoSize = Exiv2::getULong(buf.pData_, littleEndian);

            if(infoSize >= 0) {
                size -= infoSize;
                io_->read(buf.pData_, infoSize);
            }

            if(tv)
                xmpData_[exvGettext(tv->label_)] = buf.pData_;
        }
        io_->seek(cur_pos + size_external, BasicIo::beg);
    } // RiffVideo::infoTagsHandler

    void RiffVideo::junkHandler(long size)
    {
        const long bufMinSize = size;

        if (size < 0) {
    #ifndef SUPPRESS_WARNINGS
            EXV_ERROR   << " Junk Data found in this RIFF file are not of valid size ."
                        << " Entries considered invalid. Not Processed.\n";
    #endif
            io_->seek(io_->tell() + 4, BasicIo::beg);
        }

        else {
        DataBuf buf(bufMinSize+1), buf2(4+1);
        std::memset(buf.pData_, 0x0, buf.size_);
        buf2.pData_[4] = '\0';
        uint64_t cur_pos = io_->tell();

        io_->read(buf.pData_, 4);
        //! Pentax Metadata and Tags
        if(equalsRiffTag(buf, "PENT")) {

            io_->seek(cur_pos + 18, BasicIo::beg);
            io_->read(buf.pData_, 26);
            xmpData_["Xmp.video.Make"] = buf.pData_;

            io_->read(buf.pData_, 50);
            xmpData_["Xmp.video.Model"] = buf.pData_;

            std::memset(buf.pData_, 0x0, buf.size_);
            io_->read(buf.pData_, 8);
            buf2.pData_[0] = buf.pData_[4]; buf2.pData_[1] = buf.pData_[5];
            buf2.pData_[2] = buf.pData_[6]; buf2.pData_[3] = buf.pData_[7];
            xmpData_["Xmp.video.FNumber"] = (double)Exiv2::getLong(buf.pData_, littleEndian) / (double)Exiv2::getLong(buf2.pData_, littleEndian);;

            io_->seek(cur_pos + 131, BasicIo::beg);
            io_->read(buf.pData_, 26);
            xmpData_["Xmp.video.DateTimeOriginal"] = buf.pData_;

            io_->read(buf.pData_, 26);
            xmpData_["Xmp.video.DateTimeDigitized"] = buf.pData_;

            io_->seek(cur_pos + 299, BasicIo::beg);
            std::memset(buf.pData_, 0x0, buf.size_);

            io_->read(buf.pData_, 2);
            Exiv2::XmpTextValue tv(Exiv2::toString(Exiv2::getLong(buf.pData_, littleEndian)));
            xmpData_.add(Exiv2::XmpKey("Xmp.xmp.Thumbnails/xmpGImg:width"), &tv);

            io_->read(buf.pData_, 2);
            tv.read(Exiv2::toString(Exiv2::getLong(buf.pData_, littleEndian)));
            xmpData_.add(Exiv2::XmpKey("Xmp.xmp.Thumbnails/xmpGImg:height"), &tv);

            io_->read(buf.pData_, 4);

            /* TODO - Storing the image Thumbnail in Base64 Format


            uint64_t length = Exiv2::getLong(buf.pData_, littleEndian);
            io_->read(buf.pData_, length);

            char *rawStr = Exiv2::toString(buf.pData_);
            char *encodedStr;

            SXMPUtils::EncodeToBase64(rawStr, encodedStr);

            tv.read(Exiv2::toString(encodedStr));
            xmpData_.add(Exiv2::XmpKey("Xmp.xmp.Thumbnails/xmpGImg:image"), &tv);
        */
        }
        else {
            io_->seek(cur_pos, BasicIo::beg);
            io_->read(buf.pData_, size);
            xmpData_["Xmp.video.Junk"] = buf.pData_;
        }

        io_->seek(cur_pos + size, BasicIo::beg);
        }
    } // RiffVideo::junkHandler

    void RiffVideo::aviHeaderTagsHandler(long size)
    {
        const long bufMinSize = 4;
        DataBuf buf(bufMinSize+1);
        buf.pData_[4] = '\0';
        long width = 0, height = 0, frame_count = 0;
        double frame_rate = 1;

        uint64_t cur_pos = io_->tell();

        for(int i = 0; i <= 9; i++) {
            std::memset(buf.pData_, 0x0, buf.size_);
            io_->read(buf.pData_, bufMinSize);

            switch(i) {
            case frameRate:
                xmpData_["Xmp.video.MicroSecPerFrame"] = Exiv2::getULong(buf.pData_, littleEndian);
                frame_rate = (double)1000000/(double)Exiv2::getULong(buf.pData_, littleEndian);
                break;
            case (maxDataRate):
                xmpData_["Xmp.video.MaxDataRate"] = (double)Exiv2::getULong(buf.pData_, littleEndian)/(double)1024;
                break;
            case frameCount:
                xmpData_["Xmp.video.FrameCount"] = Exiv2::getULong(buf.pData_, littleEndian);
                frame_count = Exiv2::getULong(buf.pData_, littleEndian);
                break;
            case streamCount:
                xmpData_["Xmp.video.StreamCount"] = Exiv2::getULong(buf.pData_, littleEndian);
                break;
            case imageWidth_h:
                width = Exiv2::getULong(buf.pData_, littleEndian);
                xmpData_["Xmp.video.Width"] = width;
                break;
            case imageHeight_h:
                height = Exiv2::getULong(buf.pData_, littleEndian);
                xmpData_["Xmp.video.Height"] = height;
                break;
            }
        }

        fillAspectRatio(width, height);
        fillDuration(frame_rate, frame_count);

        io_->seek(cur_pos + size, BasicIo::beg);
    } // RiffVideo::aviHeaderTagsHandler

    void RiffVideo::streamHandler(long size)
    {
        const long bufMinSize = 4;
        DataBuf buf(bufMinSize+1);
        buf.pData_[4]='\0';
        long divisor = 1;
        uint64_t cur_pos = io_->tell();

        io_->read(buf.pData_, bufMinSize);
        if(equalsRiffTag(buf, "VIDS"))
            streamType_ = Video;
        else if (equalsRiffTag(buf, "AUDS"))
            streamType_ = Audio;

        for(int i=1; i<=25; i++) {
            std::memset(buf.pData_, 0x0, buf.size_);
            io_->read(buf.pData_, bufMinSize);

            switch(i) {
            case codec:
                if(streamType_ == Video)
                    xmpData_["Xmp.video.Codec"] = buf.pData_;
                else if (streamType_ == Audio)
                    xmpData_["Xmp.audio.Codec"] = buf.pData_;
                else
                    xmpData_["Xmp.video.Codec"] = buf.pData_;
                break;
            case sampleRate:
                divisor=Exiv2::getULong(buf.pData_, littleEndian);
                break;
            case (sampleRate+1):
                if(streamType_ == Video)
                    xmpData_["Xmp.video.FrameRate"] = returnSampleRate(buf,divisor);
                else if (streamType_ == Audio)
                    xmpData_["Xmp.audio.SampleRate"] = returnSampleRate(buf,divisor);
                else
                     xmpData_["Xmp.video.StreamSampleRate"] = returnSampleRate(buf,divisor);
                break;
            case sampleCount:
                if(streamType_ == Video)
                    xmpData_["Xmp.video.FrameCount"] = Exiv2::getULong(buf.pData_, littleEndian);
                else if (streamType_ == Audio)
                    xmpData_["Xmp.audio.SampleCount"] = Exiv2::getULong(buf.pData_, littleEndian);
                else
                    xmpData_["Xmp.video.StreamSampleCount"] = Exiv2::getULong(buf.pData_, littleEndian);
                break;
            case quality:
                if(streamType_ == Video)
                    xmpData_["Xmp.video.VideoQuality"] = Exiv2::getULong(buf.pData_, littleEndian);
                else if(streamType_ != Audio)
                    xmpData_["Xmp.video.StreamQuality"] = Exiv2::getULong(buf.pData_, littleEndian);
                break;
            case sampleSize:
                if(streamType_ == Video)
                    xmpData_["Xmp.video.VideoSampleSize"] = Exiv2::getULong(buf.pData_, littleEndian);
                else if(streamType_ != Audio)
                    xmpData_["Xmp.video.StreamSampleSize"] = Exiv2::getULong(buf.pData_, littleEndian);
                break;
            }

        }
        io_->seek(cur_pos + size, BasicIo::beg);
    } // RiffVideo::streamHandler

    void RiffVideo::streamFormatHandler(long size)
    {
        const long bufMinSize = 4;
        DataBuf buf(bufMinSize+1);
        buf.pData_[4] = '\0';
        uint64_t cur_pos = io_->tell();

        if(streamType_ == Video) {
            io_->read(buf.pData_, bufMinSize);

            for(int i = 0; i <= 9; i++) {
                std::memset(buf.pData_, 0x0, buf.size_);

                switch(i) {
                case imageWidth: //Will be used in case of debugging
                    io_->read(buf.pData_, bufMinSize); break;
                case imageHeight: //Will be used in case of debugging
                    io_->read(buf.pData_, bufMinSize); break;
                case planes:
                    io_->read(buf.pData_, 2);
                    xmpData_["Xmp.video.Planes"] = Exiv2::getUShort(buf.pData_, littleEndian); break;
                case bitDepth:
                    io_->read(buf.pData_, 2);
                    xmpData_["Xmp.video.PixelDepth"] = Exiv2::getUShort(buf.pData_, littleEndian); break;
                case compression:
                    io_->read(buf.pData_, bufMinSize);
                    xmpData_["Xmp.video.Compressor"] = buf.pData_; break;
                case imageLength:
                    io_->read(buf.pData_, bufMinSize);
                    xmpData_["Xmp.video.ImageLength"] = Exiv2::getULong(buf.pData_, littleEndian); break;
                case pixelsPerMeterX:
                    io_->read(buf.pData_, bufMinSize);
                    xmpData_["Xmp.video.PixelPerMeterX"] = Exiv2::getULong(buf.pData_, littleEndian); break;
                case pixelsPerMeterY:
                    io_->read(buf.pData_, bufMinSize);
                    xmpData_["Xmp.video.PixelPerMeterY"] = Exiv2::getULong(buf.pData_, littleEndian); break;
                case numColors:
                    io_->read(buf.pData_, bufMinSize);
                    if(Exiv2::getULong(buf.pData_, littleEndian) == 0) {
                        xmpData_["Xmp.video.NumOfColours"] = "Unspecified";
                    }
                    else {
                        xmpData_["Xmp.video.NumOfColours"] = Exiv2::getULong(buf.pData_, littleEndian);
                    }
                    break;
                case numImportantColors:
                    io_->read(buf.pData_, bufMinSize);
                    if(Exiv2::getULong(buf.pData_, littleEndian)) {
                        xmpData_["Xmp.video.NumIfImpColours"] = Exiv2::getULong(buf.pData_, littleEndian);
                    }
                    else {
                        xmpData_["Xmp.video.NumOfImpColours"] = "All";
                    }
                    break;
                }
            }
        }
        else if(streamType_ == Audio) {
            int c = 0;
            const TagDetails* td;
            for(int i = 0; i <= 7; i++) {
                io_->read(buf.pData_, 2);

                switch(i) {
                case encoding:
                    td = find(audioEncodingValues , Exiv2::getUShort(buf.pData_, littleEndian));
                    if(td) {
                        xmpData_["Xmp.audio.Compressor"] = exvGettext(td->label_);
                    }
                    else {
                        xmpData_["Xmp.audio.Compressor"] = Exiv2::getUShort(buf.pData_, littleEndian);
                    }
                    break;
                case numberOfChannels:
                    c = Exiv2::getUShort(buf.pData_, littleEndian);
                    if(c == 1) xmpData_["Xmp.audio.ChannelType"] = "Mono";
                    else if(c == 2) xmpData_["Xmp.audio.ChannelType"] = "Stereo";
                    else if(c == 5) xmpData_["Xmp.audio.ChannelType"] = "5.1 Surround Sound";
                    else if(c == 7) xmpData_["Xmp.audio.ChannelType"] = "7.1 Surround Sound";
                    else xmpData_["Xmp.audio.ChannelType"] = "Mono";
                    break;
                case audioSampleRate:
                    xmpData_["Xmp.audio.SampleRate"] = Exiv2::getUShort(buf.pData_, littleEndian);
                    break;
                case avgBytesPerSec:
                    xmpData_["Xmp.audio.SampleType"] = Exiv2::getUShort(buf.pData_, littleEndian);
                    break;
                case bitsPerSample:
                    xmpData_["Xmp.audio.BitsPerSample"] = Exiv2::getUShort(buf.pData_,littleEndian);
                    io_->read(buf.pData_, 2);
                    break;
                }
            }
        }
        io_->seek(cur_pos + size, BasicIo::beg);
    } // RiffVideo::streamFormatHandler

    double RiffVideo::returnSampleRate(Exiv2::DataBuf& buf, long divisor)
    {
        return ((double)Exiv2::getULong(buf.pData_, littleEndian) / (double)divisor);
    } // RiffVideo::returnSampleRate

    const char* RiffVideo::printAudioEncoding(uint64_t i)
    {
        const TagDetails* td;
        td = find(audioEncodingValues , i);
        if(td)
            return exvGettext(td->label_);

        return "Undefined";
    } // RiffVideo::printAudioEncoding

    void RiffVideo::fillAspectRatio(long width, long height)
    {
        double aspectRatio = (double)width / (double)height;
        aspectRatio = floor(aspectRatio*10) / 10;
        xmpData_["Xmp.video.AspectRatio"] = aspectRatio;

		int aR = (int) ((aspectRatio*10.0)+0.1);

		switch  (aR) {
			case 13 : xmpData_["Xmp.video.AspectRatio"] = "4:3"		; break;
			case 17 : xmpData_["Xmp.video.AspectRatio"] = "16:9"	; break;
			case 10 : xmpData_["Xmp.video.AspectRatio"] = "1:1"		; break;
			case 16 : xmpData_["Xmp.video.AspectRatio"] = "16:10"	; break;
			case 22 : xmpData_["Xmp.video.AspectRatio"] = "2.21:1"  ; break;
			case 23 : xmpData_["Xmp.video.AspectRatio"] = "2.35:1"  ; break;
			case 12 : xmpData_["Xmp.video.AspectRatio"] = "5:4"     ; break;
			default : xmpData_["Xmp.video.AspectRatio"] = aspectRatio;break;
		}
    } // RiffVideo::fillAspectRatio

    void RiffVideo::fillDuration(double frame_rate, long frame_count)
    {
        if(frame_rate == 0)
            return;

        uint64_t duration = static_cast<uint64_t>((double)frame_count * (double)1000 / (double)frame_rate);
        xmpData_["Xmp.video.FileDataRate"] = (double)io_->size()/(double)(1048576*duration);
        xmpData_["Xmp.video.Duration"] = duration; //Duration in number of seconds
    } // RiffVideo::fillDuration

    Image::AutoPtr newRiffInstance(BasicIo::AutoPtr io, bool /*create*/)
    {
        Image::AutoPtr image(new RiffVideo(io));
        if (!image->good()) {
            image.reset();
        }
        return image;
    }

    bool isRiffType(BasicIo& iIo, bool advance)
    {
        const int32_t len = 2;
        const unsigned char RiffVideoId[4] = { 'R', 'I', 'F' ,'F'};
        byte buf[len];
        iIo.read(buf, len);
        if (iIo.error() || iIo.eof()) {
            return false;
        }
        bool matched = (memcmp(buf, RiffVideoId, len) == 0);
        if (!advance || !matched) {
            iIo.seek(-len, BasicIo::cur);
        }
        return matched;
    }

}                                       // namespace Exiv2
