/*****************************************************************
|
|    AP4 - MetaData 
|
|    Copyright 2002-2008 Axiomatic Systems, LLC
|
|
|    This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
|    Unless you have obtained Bento4 under a difference license,
|    this version of Bento4 is Bento4|GPL.
|    Bento4|GPL 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, or (at your option)
|    any later version.
|
|    Bento4|GPL 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 Bento4|GPL; see the file COPYING.  If not, write to the
|    Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
|    02111-1307, USA.
|
****************************************************************/

#ifndef _AP4_META_DATA_H_
#define _AP4_META_DATA_H_

/*----------------------------------------------------------------------
|   includes
+---------------------------------------------------------------------*/
#include "Ap4Atom.h"
#include "Ap4AtomFactory.h"
#include "Ap4String.h"
#include "Ap4Array.h"
#include "Ap4List.h"

/*----------------------------------------------------------------------
|   class references
+---------------------------------------------------------------------*/
class AP4_File;
class AP4_MoovAtom;
class AP4_DataBuffer;
class AP4_ContainerAtom;
class AP4_DataAtom;
class AP4_3GppLocalizedStringAtom;
class AP4_DcfStringAtom;
class AP4_DcfdAtom;

/*----------------------------------------------------------------------
|   metadata keys
+---------------------------------------------------------------------*/
const AP4_Atom::Type AP4_ATOM_TYPE_DATA = AP4_ATOM_TYPE('d','a','t','a'); // data
const AP4_Atom::Type AP4_ATOM_TYPE_MEAN = AP4_ATOM_TYPE('m','e','a','n'); // namespace
const AP4_Atom::Type AP4_ATOM_TYPE_NAME = AP4_ATOM_TYPE('n','a','m','e'); // name
const AP4_Atom::Type AP4_ATOM_TYPE_dddd = AP4_ATOM_TYPE('-','-','-','-'); // free form
const AP4_Atom::Type AP4_ATOM_TYPE_cNAM = AP4_ATOM_TYPE(0xA9,'n','a','m'); // name
const AP4_Atom::Type AP4_ATOM_TYPE_cART = AP4_ATOM_TYPE(0xA9,'A','R','T'); // artist
const AP4_Atom::Type AP4_ATOM_TYPE_cCOM = AP4_ATOM_TYPE(0xA9,'c','o','m'); // composer
const AP4_Atom::Type AP4_ATOM_TYPE_cWRT = AP4_ATOM_TYPE(0xA9,'w','r','t'); // writer
const AP4_Atom::Type AP4_ATOM_TYPE_cALB = AP4_ATOM_TYPE(0xA9,'a','l','b'); // album
const AP4_Atom::Type AP4_ATOM_TYPE_cGEN = AP4_ATOM_TYPE(0xA9,'g','e','n'); // genre
const AP4_Atom::Type AP4_ATOM_TYPE_cGRP = AP4_ATOM_TYPE(0xA9,'g','r','p'); // group
const AP4_Atom::Type AP4_ATOM_TYPE_cDAY = AP4_ATOM_TYPE(0xA9,'d','a','y'); // date
const AP4_Atom::Type AP4_ATOM_TYPE_cTOO = AP4_ATOM_TYPE(0xA9,'t','o','o'); // tool
const AP4_Atom::Type AP4_ATOM_TYPE_cCMT = AP4_ATOM_TYPE(0xA9,'c','m','t'); // comment
const AP4_Atom::Type AP4_ATOM_TYPE_cLYR = AP4_ATOM_TYPE(0xA9,'l','y','r'); // lyrics
const AP4_Atom::Type AP4_ATOM_TYPE_TRKN = AP4_ATOM_TYPE('t','r','k','n'); // track#
const AP4_Atom::Type AP4_ATOM_TYPE_DISK = AP4_ATOM_TYPE('d','i','s','k'); // disk#
const AP4_Atom::Type AP4_ATOM_TYPE_COVR = AP4_ATOM_TYPE('c','o','v','r'); // cover art
const AP4_Atom::Type AP4_ATOM_TYPE_DESC = AP4_ATOM_TYPE('d','e','s','c'); // description
const AP4_Atom::Type AP4_ATOM_TYPE_CPIL = AP4_ATOM_TYPE('c','p','i','l'); // compilation?
const AP4_Atom::Type AP4_ATOM_TYPE_TMPO = AP4_ATOM_TYPE('t','m','p','o'); // tempo
const AP4_Atom::Type AP4_ATOM_TYPE_apID = AP4_ATOM_TYPE('a','p','I','D');
const AP4_Atom::Type AP4_ATOM_TYPE_cnID = AP4_ATOM_TYPE('c','n','I','D');
const AP4_Atom::Type AP4_ATOM_TYPE_cmID = AP4_ATOM_TYPE('c','m','I','D');
const AP4_Atom::Type AP4_ATOM_TYPE_atID = AP4_ATOM_TYPE('a','t','I','D');
const AP4_Atom::Type AP4_ATOM_TYPE_plID = AP4_ATOM_TYPE('p','l','I','D');
const AP4_Atom::Type AP4_ATOM_TYPE_geID = AP4_ATOM_TYPE('g','e','I','D');
const AP4_Atom::Type AP4_ATOM_TYPE_sfID = AP4_ATOM_TYPE('s','f','I','D');
const AP4_Atom::Type AP4_ATOM_TYPE_akID = AP4_ATOM_TYPE('a','k','I','D');
const AP4_Atom::Type AP4_ATOM_TYPE_aART = AP4_ATOM_TYPE('a','A','R','T');
const AP4_Atom::Type AP4_ATOM_TYPE_TVNN = AP4_ATOM_TYPE('t','v','n','n'); // TV network
const AP4_Atom::Type AP4_ATOM_TYPE_TVSH = AP4_ATOM_TYPE('t','v','s','h'); // TV show
const AP4_Atom::Type AP4_ATOM_TYPE_TVEN = AP4_ATOM_TYPE('t','v','e','n'); // TV episode name
const AP4_Atom::Type AP4_ATOM_TYPE_TVSN = AP4_ATOM_TYPE('t','v','s','n'); // TV show season #
const AP4_Atom::Type AP4_ATOM_TYPE_TVES = AP4_ATOM_TYPE('t','v','e','s'); // TV show episode #
const AP4_Atom::Type AP4_ATOM_TYPE_STIK = AP4_ATOM_TYPE('s','t','i','k');
const AP4_Atom::Type AP4_ATOM_TYPE_PCST = AP4_ATOM_TYPE('p','c','s','t'); // Podcast?
const AP4_Atom::Type AP4_ATOM_TYPE_PURD = AP4_ATOM_TYPE('p','u','r','d'); // 
const AP4_Atom::Type AP4_ATOM_TYPE_PURL = AP4_ATOM_TYPE('p','u','r','l'); // Podcast URL (binary)
const AP4_Atom::Type AP4_ATOM_TYPE_EGID = AP4_ATOM_TYPE('e','g','i','d'); // 
const AP4_Atom::Type AP4_ATOM_TYPE_PGAP = AP4_ATOM_TYPE('p','g','a','p'); // Gapless Playback
const AP4_Atom::Type AP4_ATOM_TYPE_CATG = AP4_ATOM_TYPE('c','a','t','g'); // Category
const AP4_Atom::Type AP4_ATOM_TYPE_KEYW = AP4_ATOM_TYPE('k','e','y','w'); // Keywords
const AP4_Atom::Type AP4_ATOM_TYPE_SONM = AP4_ATOM_TYPE('s','o','n','m'); // Sort-Order: Name
const AP4_Atom::Type AP4_ATOM_TYPE_SOAL = AP4_ATOM_TYPE('s','o','a','l'); // Sort-Order: Album
const AP4_Atom::Type AP4_ATOM_TYPE_SOAR = AP4_ATOM_TYPE('s','o','a','r'); // Sort-Order: Artist
const AP4_Atom::Type AP4_ATOM_TYPE_SOAA = AP4_ATOM_TYPE('s','o','a','a'); // Sort-Order: Album Artist
const AP4_Atom::Type AP4_ATOM_TYPE_SOCO = AP4_ATOM_TYPE('s','o','c','o'); // Sort-Order: Composer
const AP4_Atom::Type AP4_ATOM_TYPE_SOSN = AP4_ATOM_TYPE('s','o','s','n'); // Sort-Order: Show

const AP4_Atom::Type AP4_ATOM_TYPE_TITL = AP4_ATOM_TYPE('t','i','t','l'); // 3GPP: title
const AP4_Atom::Type AP4_ATOM_TYPE_DSCP = AP4_ATOM_TYPE('d','s','c','p'); // 3GPP: description
const AP4_Atom::Type AP4_ATOM_TYPE_CPRT = AP4_ATOM_TYPE('c','p','r','t'); // 3GPP, ISO or ILST: copyright
const AP4_Atom::Type AP4_ATOM_TYPE_PERF = AP4_ATOM_TYPE('p','e','r','f'); // 3GPP: performer
const AP4_Atom::Type AP4_ATOM_TYPE_AUTH = AP4_ATOM_TYPE('a','u','t','h'); // 3GPP: author
const AP4_Atom::Type AP4_ATOM_TYPE_GNRE = AP4_ATOM_TYPE('g','n','r','e'); // 3GPP or ILST: genre (in 3GPP -> string, in ILST -> ID3v1 index + 1)
const AP4_Atom::Type AP4_ATOM_TYPE_RTNG = AP4_ATOM_TYPE('r','t','n','g'); // 3GPP or ILST: rating
const AP4_Atom::Type AP4_ATOM_TYPE_CLSF = AP4_ATOM_TYPE('c','l','s','f'); // 3GPP: classification
const AP4_Atom::Type AP4_ATOM_TYPE_KYWD = AP4_ATOM_TYPE('k','y','w','d'); // 3GPP: keywords
const AP4_Atom::Type AP4_ATOM_TYPE_LOCI = AP4_ATOM_TYPE('l','o','c','i'); // 3GPP: location information
const AP4_Atom::Type AP4_ATOM_TYPE_ALBM = AP4_ATOM_TYPE('a','l','b','m'); // 3GPP: album title and track number
const AP4_Atom::Type AP4_ATOM_TYPE_YRRC = AP4_ATOM_TYPE('y','r','r','c'); // 3GPP: recording year
const AP4_Atom::Type AP4_ATOM_TYPE_TSEL = AP4_ATOM_TYPE('t','s','e','l'); // 3GPP: track selection

const AP4_Atom::Type AP4_ATOM_TYPE_ICNU = AP4_ATOM_TYPE('i','c','n','u'); // DCF: icon URI      (OMA DCF 2.1)
const AP4_Atom::Type AP4_ATOM_TYPE_INFU = AP4_ATOM_TYPE('i','n','f','u'); // DCF: info URI      (OMA DCF 2.1)
const AP4_Atom::Type AP4_ATOM_TYPE_CVRU = AP4_ATOM_TYPE('c','v','r','u'); // DCF: cover art URI (OMA DCF 2.1)
const AP4_Atom::Type AP4_ATOM_TYPE_LRCU = AP4_ATOM_TYPE('l','r','c','u'); // DCF: lyrics URI    (OMA DCF 2.1)
const AP4_Atom::Type AP4_ATOM_TYPE_DCFD = AP4_ATOM_TYPE('d','c','f','D'); // DCF: duration      (OMarlin)

/*----------------------------------------------------------------------
|   AP4_MetaData
+---------------------------------------------------------------------*/
class AP4_MetaData {
public:
    class Key {
    public:
        // constructors
        Key(const char* name, const char* ns) :
          m_Name(name), m_Namespace(ns) {}

        // methods
        const AP4_String& GetNamespace() const { return m_Namespace; }
        const AP4_String& GetName()      const { return m_Name;      }

    private:
        // members
        const AP4_String m_Name;
        const AP4_String m_Namespace;
    };

    class Value {
    public:
        // types 
        typedef enum {
            TYPE_BINARY,
            TYPE_STRING_UTF_8,
            TYPE_STRING_UTF_16,
            TYPE_STRING_PASCAL,
            TYPE_GIF,
            TYPE_JPEG,
            TYPE_INT_08_BE,
            TYPE_INT_16_BE,
            TYPE_INT_32_BE,
            TYPE_FLOAT_32_BE,
            TYPE_FLOAT_64_BE
        } Type;

        typedef enum {
            TYPE_CATEGORY_STRING,
            TYPE_CATEGORY_BINARY,
            TYPE_CATEGORY_INTEGER,
            TYPE_CATEGORY_FLOAT
        } TypeCategory;

        typedef enum {
            MEANING_UNKNOWN,
            MEANING_ID3_GENRE,
            MEANING_BOOLEAN,
            MEANING_FILE_KIND,
            MEANING_BINARY_ENCODED_CHARS
        } Meaning;
        
        // destructor
        virtual ~Value() {}

        // methods
        Type               GetType() const                   { return m_Type;         }
        TypeCategory       GetTypeCategory() const;
        Meaning            GetMeaning() const                { return m_Meaning;      }
        const AP4_String&  GetLanguage() const               { return m_Language;     }
        void               SetLanguage(const char* language) { m_Language = language; }
        virtual AP4_String ToString() const = 0;
        virtual AP4_Result ToBytes(AP4_DataBuffer& bytes) const = 0;
        virtual long       ToInteger() const = 0;
        
    protected:
        // class methods
        static TypeCategory MapTypeToCategory(Type type);
        
        // constructor
        Value(Type        type, 
              Meaning     meaning  = MEANING_UNKNOWN, 
              const char* language = NULL) :
            m_Type(type), m_Meaning(meaning), m_Language(language) {}

        // members
        Type       m_Type;
        Meaning    m_Meaning;
        AP4_String m_Language;
    };
    
    struct KeyInfo {
		// members
        const char* name;
        const char* description;
        AP4_UI32    four_cc;
        Value::Type value_type;
    };

    class Entry {
    public:
        // constructor
        Entry(const char* name, const char* ns, Value* value) :
          m_Key(name, ns), m_Value(value) {}

        // destructor
        ~Entry() { delete m_Value; }

        // methods
        AP4_Result         AddToFile(AP4_File& file, AP4_Ordinal index = 0);
        AP4_Result         AddToFileIlst(AP4_File& file, AP4_Ordinal index = 0);
        AP4_Result         AddToFileDcf(AP4_File& file, AP4_Ordinal index = 0);
        AP4_Result         AddToFileUdta(AP4_File& file, AP4_Ordinal index = 0);
        AP4_Result         RemoveFromFile(AP4_File& file, AP4_Ordinal index);
        AP4_Result         RemoveFromFileIlst(AP4_File& file, AP4_Ordinal index);
        AP4_Result         RemoveFromFileDcf(AP4_File& file, AP4_Ordinal index);
        AP4_Result         RemoveFromFileUdta(AP4_File& file, AP4_Ordinal index);
        AP4_ContainerAtom* FindInIlst(AP4_ContainerAtom* ilst) const;
        AP4_Result         ToAtom(AP4_Atom*& atom) const;

        // members
        Key    m_Key;
        Value* m_Value;    
    };

    // class members
    static AP4_Array<KeyInfo> KeyInfos;
    
    // constructor
    AP4_MetaData(AP4_File* file);
    
    // methods
    AP4_Result ParseMoov(AP4_MoovAtom* moov);
    AP4_Result ParseUdta(AP4_ContainerAtom* udta, const char* namespc);
    
    // destructor
    ~AP4_MetaData();

    // accessors
    const AP4_List<Entry>& GetEntries() const { return m_Entries; }

    // methods
    AP4_Result ResolveKeyName(AP4_Atom::Type atom_type, AP4_String& value);
    AP4_Result AddIlstEntries(AP4_ContainerAtom* atom, const char* namespc);
    AP4_Result Add3GppEntry(AP4_3GppLocalizedStringAtom* atom, const char* namespc);
    AP4_Result AddDcfStringEntry(AP4_DcfStringAtom* atom, const char* namespc);
    AP4_Result AddDcfdEntry(AP4_DcfdAtom* atom, const char* namespc);
    
private:
    friend class AP4;
    static AP4_Result Initialize(); // don't call this directly. See AP4::Initialize for details
    static AP4_Result Initialized(); 
    static AP4_Result UnInitialize();

    // members
    AP4_List<Entry> m_Entries;
};

/*----------------------------------------------------------------------
|   AP4_MetaDataAtomTypeHandler
+---------------------------------------------------------------------*/
class AP4_MetaDataAtomTypeHandler : public AP4_AtomFactory::TypeHandler
{
public:
    // constructor
    AP4_MetaDataAtomTypeHandler(AP4_AtomFactory* atom_factory) :
      m_AtomFactory(atom_factory) {}
    virtual AP4_Result CreateAtom(AP4_Atom::Type  type,
                                  AP4_UI32        size,
                                  AP4_ByteStream& stream,
                                  AP4_Atom::Type  context,
                                  AP4_Atom*&      atom);

    // types
    struct TypeList {
        const AP4_Atom::Type* m_Types;
        AP4_Size              m_Size;
    };
    
    // class constants
    static const AP4_Atom::Type IlstTypes[];
    static const TypeList       IlstTypeList;
    static const AP4_Atom::Type _3gppLocalizedStringTypes[];
    static const TypeList       _3gppLocalizedStringTypeList;
    static const AP4_Atom::Type _3gppOtherTypes[];
    static const TypeList       _3gppOtherTypeList;
    static const AP4_Atom::Type DcfStringTypes[];
    static const TypeList       DcfStringTypeList;
    
    // class methods
    static bool IsTypeInList(AP4_Atom::Type type, const TypeList& list);

private:
    // members
    AP4_AtomFactory* m_AtomFactory;
};

/*----------------------------------------------------------------------
|   AP4_MetaDataTag
+---------------------------------------------------------------------*/
class AP4_MetaDataTag
{
public:

    // destructor
    virtual ~AP4_MetaDataTag() {}

    // methods
    virtual AP4_Result Write(AP4_ByteStream& stream);
    virtual AP4_Result Inspect(AP4_AtomInspector& inspector);

protected:
    // constructor
    AP4_MetaDataTag(AP4_UI32        data_type, 
                    AP4_UI32        data_lang,
                    AP4_Size        size, 
                    AP4_ByteStream& stream);

};

/*----------------------------------------------------------------------
|   AP4_3GppLocalizedStringAtom
+---------------------------------------------------------------------*/
class AP4_3GppLocalizedStringAtom : public AP4_Atom
{
public:
    AP4_IMPLEMENT_DYNAMIC_CAST_D(AP4_3GppLocalizedStringAtom, AP4_Atom)

    // factory method
    static AP4_3GppLocalizedStringAtom* Create(Type type, AP4_UI32 size, AP4_ByteStream& stream);
     
    // constructor
    AP4_3GppLocalizedStringAtom(Type type, const char* language, const char* value);
    AP4_3GppLocalizedStringAtom(Type            type, 
                                AP4_UI32        size, 
                                AP4_UI08        version,
                                AP4_UI32        flags,
                                AP4_ByteStream& stream);
    
    // AP4_Atom methods
    virtual AP4_Result InspectFields(AP4_AtomInspector& inspector);
    virtual AP4_Result WriteFields(AP4_ByteStream& stream);
    
    // methods
    const char*       GetLanguage() const { return m_Language; }
    const AP4_String& GetValue()    const { return m_Value;    }
    
private:
    // members
    char       m_Language[4];
    AP4_String m_Value;
};

/*----------------------------------------------------------------------
|   AP4_DcfStringAtom
+---------------------------------------------------------------------*/
class AP4_DcfStringAtom : public AP4_Atom
{
public:
    AP4_IMPLEMENT_DYNAMIC_CAST_D(AP4_DcfStringAtom, AP4_Atom)

    // factory method
    static AP4_DcfStringAtom* Create(Type type, AP4_UI32 size, AP4_ByteStream& stream);
     
    // constructor
    AP4_DcfStringAtom(Type type, const char* value);
    AP4_DcfStringAtom(Type            type, 
                      AP4_UI32        size, 
                      AP4_UI08        version,
                      AP4_UI32        flags,
                      AP4_ByteStream& stream);
    
    // AP4_Atom methods
    virtual AP4_Result InspectFields(AP4_AtomInspector& inspector);
    virtual AP4_Result WriteFields(AP4_ByteStream& stream);
    
    // methods
    const AP4_String& GetValue() const { return m_Value;  }
    
private:
    // members
    AP4_String m_Value;
};

/*----------------------------------------------------------------------
|   AP4_DcfdAtom
+---------------------------------------------------------------------*/
class AP4_DcfdAtom : public AP4_Atom
{
public:
    AP4_IMPLEMENT_DYNAMIC_CAST_D(AP4_DcfdAtom, AP4_Atom)

    // factory method
    static AP4_DcfdAtom* Create(AP4_UI32 size, AP4_ByteStream& stream);
     
    // constructors
    AP4_DcfdAtom(AP4_UI08        version,
                 AP4_UI32        flags,
                 AP4_ByteStream& stream);
    AP4_DcfdAtom(AP4_UI32 duration);
    
    // AP4_Atom methods
    virtual AP4_Result InspectFields(AP4_AtomInspector& inspector);
    virtual AP4_Result WriteFields(AP4_ByteStream& stream);
    
    // methods
    AP4_UI32 GetDuration() const { return m_Duration;  }
    
private:
    // members
    AP4_UI32 m_Duration;
};

/*----------------------------------------------------------------------
|   AP4_MetaDataStringAtom
+---------------------------------------------------------------------*/
class AP4_MetaDataStringAtom : public AP4_Atom
{
public:
    AP4_IMPLEMENT_DYNAMIC_CAST_D(AP4_MetaDataStringAtom, AP4_Atom)

    // constructors
    AP4_MetaDataStringAtom(Type type, const char* value);
    AP4_MetaDataStringAtom(Type type, AP4_UI32 size, AP4_ByteStream& stream);

    // AP4_Atom methods
    virtual AP4_Result InspectFields(AP4_AtomInspector& inspector);
    virtual AP4_Result WriteFields(AP4_ByteStream& stream);

    // methods
    const AP4_String& GetValue() { return m_Value; }

private:
    // members
    AP4_UI32   m_Reserved;
    AP4_String m_Value;
};

/*----------------------------------------------------------------------
|   AP4_DataAtom
+---------------------------------------------------------------------*/
class AP4_DataAtom : public AP4_Atom
{
public:
    AP4_IMPLEMENT_DYNAMIC_CAST_D(AP4_DataAtom, AP4_Atom)

    typedef enum {
        DATA_TYPE_BINARY        = 0,
        DATA_TYPE_STRING_UTF_8  = 1,
        DATA_TYPE_STRING_UTF_16 = 2,
        DATA_TYPE_STRING_PASCAL = 3,
        DATA_TYPE_GIF           = 13,
        DATA_TYPE_JPEG          = 14,
        DATA_TYPE_SIGNED_INT_BE = 21, /* the size of the integer is derived from the container size */
        DATA_TYPE_FLOAT_32_BE   = 22,
        DATA_TYPE_FLOAT_64_BE   = 23
    } DataType;

    typedef enum {
        LANGUAGE_ENGLISH = 0
    } DataLang;

    // constructors
    AP4_DataAtom(const AP4_MetaData::Value& value);
    AP4_DataAtom(AP4_UI32 size, AP4_ByteStream& stream);

    // destructor
    ~AP4_DataAtom();

    // AP4_Atom methods
    virtual AP4_Result InspectFields(AP4_AtomInspector& inspector);
    virtual AP4_Result WriteFields(AP4_ByteStream& stream);

    // accessors
    DataType GetDataType() { return m_DataType; }
    DataLang GetDataLang() { return m_DataLang; }
    AP4_MetaData::Value::Type GetValueType();
    
    // methods
    AP4_Result LoadString(AP4_String*& string);
    AP4_Result LoadBytes(AP4_DataBuffer& bytes);
    AP4_Result LoadInteger(long& value);

private:
    // members
    DataType        m_DataType;
    DataLang        m_DataLang;
    AP4_ByteStream* m_Source;
};

/*----------------------------------------------------------------------
|   AP4_StringMetaDataValue
+---------------------------------------------------------------------*/
class AP4_StringMetaDataValue : public AP4_MetaData::Value {
public:
    // constructor
    AP4_StringMetaDataValue(const char* value, const char* language=NULL) : 
        Value(TYPE_STRING_UTF_8, MEANING_UNKNOWN, language), 
        m_Value(value) {}

    // AP4_MetaData::Value methods
    virtual AP4_String ToString() const;
    virtual AP4_Result ToBytes(AP4_DataBuffer& bytes) const;
    virtual long       ToInteger() const;
    
private:
    // members
    AP4_String m_Value;
};

/*----------------------------------------------------------------------
|   AP4_IntegerMetaDataValue
+---------------------------------------------------------------------*/
class AP4_IntegerMetaDataValue : public AP4_MetaData::Value {
public:
    // constructor
    AP4_IntegerMetaDataValue(Type type, long value) :
        Value(type), m_Value(value) {}

    // AP4_MetaData::Value methods
    virtual AP4_String ToString() const;
    virtual AP4_Result ToBytes(AP4_DataBuffer& bytes) const;
    virtual long       ToInteger() const;
    
private:
    // members
    long m_Value;
};

/*----------------------------------------------------------------------
|   AP4_BinaryMetaDataValue
+---------------------------------------------------------------------*/
class AP4_BinaryMetaDataValue : public AP4_MetaData::Value {
public:
    // constructor
    AP4_BinaryMetaDataValue(Type type, const AP4_UI08* data, AP4_Size size) :
        Value(type), m_Value(data, size) {}

    // AP4_MetaData::Value methods
    virtual AP4_String ToString() const;
    virtual AP4_Result ToBytes(AP4_DataBuffer& bytes) const;
    virtual long       ToInteger() const;
    
private:
    // members
    AP4_DataBuffer m_Value;
};

/*----------------------------------------------------------------------
|   AP4_AtomMetaDataValue
+---------------------------------------------------------------------*/
class AP4_AtomMetaDataValue : public AP4_MetaData::Value
{
public:
    // constructor
    AP4_AtomMetaDataValue(AP4_DataAtom* data_atom, AP4_UI32 parent_type);

    // AP4_MetaData::Value methods
    virtual AP4_String ToString() const;
    virtual AP4_Result ToBytes(AP4_DataBuffer& bytes) const;
    virtual long       ToInteger() const;

private:
    // members
    AP4_DataAtom* m_DataAtom;
};

#endif // _AP4_META_DATA_H_