field.cpp

更新mp3

    ID3V2_LATEST,                       // ENDING SPEC
    ID3FF_ADJUSTEDBY,                   // FLAGS
    ID3FN_NUMBITS                       // LINKED FIELD
  },
  { ID3FN_NOFIELD }
};
#endif /* _UNDEFINED_ */

// **** Currently Implemented Frames
// APIC  PIC  ID3FID_PICTURE           Attached picture
// COMM  COM  ID3FID_COMMENT           Comments
// ENCR       ID3FID_CRYPTOREG         Encryption method registration
// GEOB  GEO  ID3FID_GENERALOBJECT     General encapsulated object
// GRID       ID3FID_GROUPINGREG       Group identification registration
// IPLS  IPL  ID3FID_INVOLVEDPEOPLE    Involved people list
// LINK  LNK  ID3FID_LINKEDINFO        Linked information
// PCNT  CNT  ID3FID_PLAYCOUNTER       Play counter
// POPM  POP  ID3FID_POPULARIMETER     Popularimeter
// PRIV       ID3FID_PRIVATE           Private frame
// SYLT  SLT  ID3FID_SYNCEDLYRICS      Synchronized lyric/text
// TALB  TAL  ID3FID_ALBUM             Album/Movie/Show title
// TBPM  TBP  ID3FID_BPM               BPM (beats per minute)
// TCOM  TCM  ID3FID_COMPOSER          Composer
// TCON  TCO  ID3FID_CONTENTTYPE       Content type
// TCOP  TCR  ID3FID_COPYRIGHT         Copyright message
// TDAT  TDA  ID3FID_DATE              Date
// TDLY  TDY  ID3FID_PLAYLISTDELAY     Playlist delay
// TENC  TEN  ID3FID_ENCODEDBY         Encoded by
// TEXT  TXT  ID3FID_LYRICIST          Lyricist/Text writer
// TFLT  TFT  ID3FID_FILETYPE          File type
// TIME  TKE  ID3FID_TIME              Time
// TIT1  TIM  ID3FID_CONTENTGROUP      Content group description
// TIT2  TT1  ID3FID_TITLE             Title/songname/content description
// TIT3  TT2  ID3FID_SUBTITLE          Subtitle/Description refinement
// TKEY  TT3  ID3FID_INITIALKEY        Initial key
// TLAN  TLA  ID3FID_LANGUAGE          Language(s)
// TLEN  TLE  ID3FID_SONGLEN           Length
// TMED  TMT  ID3FID_MEDIATYPE         Media type
// TOAL  TOT  ID3FID_ORIGALBUM         Original album/movie/show title
// TOFN  TOF  ID3FID_ORIGFILENAME      Original filename
// TOLY  TOL  ID3FID_ORIGLYRICIST      Original lyricist(s)/text writer(s)
// TOPE  TOA  ID3FID_ORIGARTIST        Original artist(s)/performer(s)
// TORY  TOR  ID3FID_ORIGYEAR          Original release year
// TOWN       ID3FID_FILEOWNER         File owner/licensee
// TPE1  TP1  ID3FID_LEADARTIST        Lead performer(s)/Soloist(s)
// TPE2  TP2  ID3FID_BAND              Band/orchestra/accompaniment
// TPE3  TP3  ID3FID_CONDUCTOR         Conductor/performer refinement
// TPE4  TP4  ID3FID_MIXARTIST         Interpreted, remixed, or otherwise modified
// TPOS  TPA  ID3FID_PARTINSET         Part of a set
// TPUB  TPB  ID3FID_PUBLISHER         Publisher
// TRCK  TRK  ID3FID_TRACKNUM          Track number/Position in set
// TRDA  TRD  ID3FID_RECORDINGDATES    Recording dates
// TRSN  TRN  ID3FID_NETRADIOSTATION   Internet radio station name
// TRSO  TRO  ID3FID_NETRADIOOWNER     Internet radio station owner
// TSIZ  TSI  ID3FID_SIZE              Size
// TSRC  TRC  ID3FID_ISRC              ISRC (international standard recording code)
// TSSE  TSS  ID3FID_ENCODERSETTINGS   Software/Hardware and encoding settings
// TXXX  TXX  ID3FID_USERTEXT          User defined text information
// TYER  TYE  ID3FID_YEAR              Year
// UFID  UFI  ID3FID_UNIQUEFILEID      Unique file identifier
// USER       ID3FID_TERMSOFUSE        Terms of use
// USLT  ULT  ID3FID_UNSYNCEDLYRICS    Unsynchronized lyric/text transcription
// WCOM  WCM  ID3FID_WWWCOMMERCIALINFO Commercial information
// WCOP  WCM  ID3FID_WWWCOPYRIGHT      Copyright/Legal infromation
// WOAF  WCP  ID3FID_WWWAUDIOFILE      Official audio file webpage
// WOAR  WAF  ID3FID_WWWARTIST         Official artist/performer webpage
// WOAS  WAR  ID3FID_WWWAUDIOSOURCE    Official audio source webpage
// WORS  WAS  ID3FID_WWWRADIOPAGE      Official internet radio station homepage
// WPAY  WRA  ID3FID_WWWPAYMENT        Payment
// WPUB  WPY  ID3FID_WWWPUBLISHER      Official publisher webpage
// WXXX  WXX  ID3FID_WWWUSER           User defined URL link
//       CDM  ID3FID_METACOMPRESSION   Compressed data meta frame

// **** Currently unimplemented frames
// AENC  CRA  ID3FID_AUDIOCRYPTO       Audio encryption
// COMR       ID3FID_COMMERCIAL        Commercial frame
// EQUA  EQU  ID3FID_EQUALIZATION      Equalization
// ETCO  ETC  ID3FID_EVENTTIMING       Event timing codes
// MCDI  MCI  ID3FID_CDID              Music CD identifier
// MLLT  MLL  ID3FID_MPEGLOOKUP        MPEG location lookup table
// OWNE       ID3FID_OWNERSHIP         Ownership frame
// POSS       ID3FID_POSITIONSYNC      Position synchronisation frame
// RBUF  BUF  ID3FID_BUFFERSIZE        Recommended buffer size
// RVAD  RVA  ID3FID_VOLUMEADJ         Relative volume adjustment
// RVRB  REV  ID3FID_REVERB            Reverb
// SYTC  STC  ID3FID_SYNCEDTEMPO       Synchronized tempo codes
//       CRM  ID3FID_METACRYPTO        Encrypted meta frame
static  ID3_FrameDef ID3_FrameDefs[] =
{
  //                          short  long   tag    file
  // frame id                 id     id     discrd discrd field defs           description
  {ID3FID_AUDIOCRYPTO,       "CRA", "AENC", false, false, ID3FD_Unimplemented, "Audio encryption"},
  {ID3FID_PICTURE,           "PIC", "APIC", false, false, ID3FD_Picture,       "Attached picture"},
  {ID3FID_COMMENT,           "COM", "COMM", false, false, ID3FD_GeneralText,   "Comments"},
  {ID3FID_COMMERCIAL,        ""   , "COMR", false, false, ID3FD_Unimplemented, "Commercial"},
  {ID3FID_CRYPTOREG,         ""   , "ENCR", false, false, ID3FD_Registration,  "Encryption method registration"},
  {ID3FID_EQUALIZATION,      "EQU", "EQUA", false, true,  ID3FD_Unimplemented, "Equalization"},
  {ID3FID_EVENTTIMING,       "ETC", "ETCO", false, true,  ID3FD_Unimplemented, "Event timing codes"},
  {ID3FID_GENERALOBJECT,     "GEO", "GEOB", false, false, ID3FD_GEO,           "General encapsulated object"},
  {ID3FID_GROUPINGREG,       ""   , "GRID", false, false, ID3FD_Registration,  "Group identification registration"},
  {ID3FID_INVOLVEDPEOPLE,    "IPL", "IPLS", false, false, ID3FD_InvolvedPeople,"Involved people list"},
  {ID3FID_LINKEDINFO,        "LNK", "LINK", false, false, ID3FD_LinkedInfo,    "Linked information"},
  {ID3FID_CDID,              "MCI", "MCDI", false, false, ID3FD_Unimplemented, "Music CD identifier"},
  {ID3FID_MPEGLOOKUP,        "MLL", "MLLT", false, true,  ID3FD_Unimplemented, "MPEG location lookup table"},
  {ID3FID_OWNERSHIP,         ""   , "OWNE", false, false, ID3FD_Unimplemented, "Ownership frame"},
  {ID3FID_PRIVATE,           ""   , "PRIV", false, false, ID3FD_Private,       "Private frame"},
  {ID3FID_PLAYCOUNTER,       "CNT", "PCNT", false, false, ID3FD_PlayCounter,   "Play counter"},
  {ID3FID_POPULARIMETER,     "POP", "POPM", false, false, ID3FD_Popularimeter, "Popularimeter"},
  {ID3FID_POSITIONSYNC,      ""   , "POSS", false, true,  ID3FD_Unimplemented, "Position synchronisation frame"},
  {ID3FID_BUFFERSIZE,        "BUF", "RBUF", false, false, ID3FD_Unimplemented, "Recommended buffer size"},
  {ID3FID_VOLUMEADJ,         "RVA", "RVAD", false, true,  ID3FD_Unimplemented, "Relative volume adjustment"},
  {ID3FID_REVERB,            "REV", "RVRB", false, false, ID3FD_Unimplemented, "Reverb"},
  {ID3FID_SYNCEDLYRICS,      "SLT", "SYLT", false, false, ID3FD_SyncLyrics,    "Synchronized lyric/text"},
  {ID3FID_SYNCEDTEMPO,       "STC", "SYTC", false, true,  ID3FD_Unimplemented, "Synchronized tempo codes"},
  {ID3FID_ALBUM,             "TAL", "TALB", false, false, ID3FD_Text,          "Album/Movie/Show title"},
  {ID3FID_BPM,               "TBP", "TBPM", false, false, ID3FD_Text,          "BPM (beats per minute)"},
  {ID3FID_COMPOSER,          "TCM", "TCOM", false, false, ID3FD_Text,          "Composer"},
  {ID3FID_CONTENTTYPE,       "TCO", "TCON", false, false, ID3FD_Text,          "Content type"},
  {ID3FID_COPYRIGHT,         "TCR", "TCOP", false, false, ID3FD_Text,          "Copyright message"},
  {ID3FID_DATE,              "TDA", "TDAT", false, false, ID3FD_Text,          "Date"},
  {ID3FID_PLAYLISTDELAY,     "TDY", "TDLY", false, false, ID3FD_Text,          "Playlist delay"},
  {ID3FID_ENCODEDBY,         "TEN", "TENC", false, true,  ID3FD_Text,          "Encoded by"},
  {ID3FID_LYRICIST,          "TXT", "TEXT", false, false, ID3FD_Text,          "Lyricist/Text writer"},
  {ID3FID_FILETYPE,          "TFT", "TFLT", false, false, ID3FD_Text,          "File type"},
  {ID3FID_TIME,              "TIM", "TIME", false, false, ID3FD_Text,          "Time"},
  {ID3FID_CONTENTGROUP,      "TT1", "TIT1", false, false, ID3FD_Text,          "Content group description"},
  {ID3FID_TITLE,             "TT2", "TIT2", false, false, ID3FD_Text,          "Title/songname/content description"},
  {ID3FID_SUBTITLE,          "TT3", "TIT3", false, false, ID3FD_Text,          "Subtitle/Description refinement"},
  {ID3FID_INITIALKEY,        "TKE", "TKEY", false, false, ID3FD_Text,          "Initial key"},
  {ID3FID_LANGUAGE,          "TLA", "TLAN", false, false, ID3FD_Text,          "Language(s)"},
  {ID3FID_SONGLEN,           "TLE", "TLEN", false, true,  ID3FD_Text,          "Length"},
  {ID3FID_MEDIATYPE,         "TMT", "TMED", false, false, ID3FD_Text,          "Media type"},
  {ID3FID_ORIGALBUM,         "TOT", "TOAL", false, false, ID3FD_Text,          "Original album/movie/show title"},
  {ID3FID_ORIGFILENAME,      "TOF", "TOFN", false, false, ID3FD_Text,          "Original filename"},
  {ID3FID_ORIGLYRICIST,      "TOL", "TOLY", false, false, ID3FD_Text,          "Original lyricist(s)/text writer(s)"},
  {ID3FID_ORIGARTIST,        "TOA", "TOPE", false, false, ID3FD_Text,          "Original artist(s)/performer(s)"},
  {ID3FID_ORIGYEAR,          "TOR", "TORY", false, false, ID3FD_Text,          "Original release year"},
  {ID3FID_FILEOWNER,         ""   , "TOWN", false, false, ID3FD_Text,          "File owner/licensee"},
  {ID3FID_LEADARTIST,        "TP1", "TPE1", false, false, ID3FD_Text,          "Lead performer(s)/Soloist(s)"},
  {ID3FID_BAND,              "TP2", "TPE2", false, false, ID3FD_Text,          "Band/orchestra/accompaniment"},
  {ID3FID_CONDUCTOR,         "TP3", "TPE3", false, false, ID3FD_Text,          "Conductor/performer refinement"},
  {ID3FID_MIXARTIST,         "TP4", "TPE4", false, false, ID3FD_Text,          "Interpreted, remixed, or otherwise modified by"},
  {ID3FID_PARTINSET,         "TPA", "TPOS", false, false, ID3FD_Text,          "Part of a set"},
  {ID3FID_PUBLISHER,         "TPB", "TPUB", false, false, ID3FD_Text,          "Publisher"},
  {ID3FID_TRACKNUM,          "TRK", "TRCK", false, false, ID3FD_Text,          "Track number/Position in set"},
  {ID3FID_RECORDINGDATES,    "TRD", "TRDA", false, false, ID3FD_Text,          "Recording dates"},
  {ID3FID_NETRADIOSTATION,   "TRN", "TRSN", false, false, ID3FD_Text,          "Internet radio station name"},
  {ID3FID_NETRADIOOWNER,     "TRO", "TRSO", false, false, ID3FD_Text,          "Internet radio station owner"},
  {ID3FID_SIZE,              "TSI", "TSIZ", false, true,  ID3FD_Text,          "Size"},
  {ID3FID_ISRC,              "TRC", "TSRC", false, false, ID3FD_Text,          "ISRC (international standard recording code)"},
  {ID3FID_ENCODERSETTINGS,   "TSS", "TSSE", false, false, ID3FD_Text,          "Software/Hardware and settings used for encoding"},
  {ID3FID_USERTEXT,          "TXX", "TXXX", false, false, ID3FD_UserText,      "User defined text information"},
  {ID3FID_YEAR,              "TYE", "TYER", false, false, ID3FD_Text,          "Year"},
  {ID3FID_UNIQUEFILEID,      "UFI", "UFID", false, false, ID3FD_UFI,           "Unique file identifier"},
  {ID3FID_TERMSOFUSE,        ""   , "USER", false, false, ID3FD_TermsOfUse,    "Terms of use"},
  {ID3FID_UNSYNCEDLYRICS,    "ULT", "USLT", false, false, ID3FD_GeneralText,   "Unsynchronized lyric/text transcription"},
  {ID3FID_WWWCOMMERCIALINFO, "WCM", "WCOM", false, false, ID3FD_URL,           "Commercial information"},
  {ID3FID_WWWCOPYRIGHT,      "WCP", "WCOP", false, false, ID3FD_URL,           "Copyright/Legal infromation"},
  {ID3FID_WWWAUDIOFILE,      "WAF", "WOAF", false, false, ID3FD_URL,           "Official audio file webpage"},
  {ID3FID_WWWARTIST,         "WAR", "WOAR", false, false, ID3FD_URL,           "Official artist/performer webpage"},
  {ID3FID_WWWAUDIOSOURCE,    "WAS", "WOAS", false, false, ID3FD_URL,           "Official audio source webpage"},
  {ID3FID_WWWRADIOPAGE,      "WRA", "WORS", false, false, ID3FD_URL,           "Official internet radio station homepage"},
  {ID3FID_WWWPAYMENT,        "WPY", "WPAY", false, false, ID3FD_URL,           "Payment"},
  {ID3FID_WWWPUBLISHER,      "WPB", "WPUB", false, false, ID3FD_URL,           "Official publisher webpage"},
  {ID3FID_WWWUSER,           "WXX", "WXXX", false, false, ID3FD_UserURL,       "User defined URL link"},
  {ID3FID_METACRYPTO,        "CRM", ""    , false, false, ID3FD_Unimplemented, "Encrypted meta frame"},
  {ID3FID_METACOMPRESSION,   "CDM", ""    , false, false, ID3FD_CDM,           "Compressed data meta frame"},
  {ID3FID_NOFRAME}
};

/** \class ID3_Field field.h id3/field.h
 ** \brief The representative class of an ID3v2 field.
 **
 ** As a general rule, you need never create an object of this type.  id3lib
 ** uses them internally as part of the id3_frame class.  You must know how to
 ** interact with these objects, though, and that's what this section is about.
 **
 ** The ID3_Field contains many overloaded methods to provide these facilities
 ** for four different data types: integers, ASCII strings, Unicode strings,
 ** and binary data.
 **
 ** An integer field supports the Get(), Set(uint32), and operator=(uint32)
 ** methods.
 **
 ** Both types of strings support the GetNumTextItems() method.
 **
 ** An ASCII string field supports the Get(char*, size_t, size_t)),
 ** Set(const char*), Add(const char*), and operator=(const char*) methods.
 **
 ** A Unicode field also supports Get(unicode_t*, size_t, size_t),
 ** Set(const unicode_t*), Add(const unicode_t*), and
 ** operator=(const unicode_t*).  Without elaborating, the Unicode
 ** methods behave exactly the same as their ASCII counterparts, taking
 ** \c unicode_t pointers in place of \c char pointers.
 **
 ** All strings in id3lib are handled internally as Unicode.  This means that
 ** when you set a field with an ASCII source type, it will be converted and
 ** stored internally as a Unicode string.  id3lib will handle all necessary
 ** conversions when parsing, rendering, and retrieving.  If you set a field as
 ** an ASCII string, then try to read the string into a \c unicode_t buffer,
 ** id3lib will automatically convert the string into Unicode so this will
 ** function as expected.  The same holds true in reverse.  Of course, when
 ** converting from Unicode to ASCII, you will experience problems when the
 ** Unicode string contains characters that don't map to ISO-8859-1.
 **
 ** A binary field supports the Get(uchar*, size_t), Set(const uchar*, size_t),
 ** FromFile(const char*), and ToFile(const char*) methods.  The binary field
 ** holds miscellaneous data that can't easily be described any other way, such
 ** as a JPEG image.
 **
 ** As a general implementation note, you should be prepared to support all
 ** fields in an id3lib frame, even if all fields in the id3lib version of the
 ** frame aren't present in the id3v2 version.  This is because of frames like
 ** the picture frame, which changed slightly from one version of the id3v2
 ** standard to the next (the IMAGEFORMAT format in 2.0 changed to a MIMETYPE
 ** in 3.0).  If you support all id3lib fields in a given frame, id3lib can
 ** generate the correct id3v2 frame for the id3v2 version you wish to support.
 ** Alternatively, just support the fields you know will be used in, say, 3.0
 ** if you only plan to generate 3.0 tags.
 **
 ** @author Dirk Mahoney
 ** @version $Id: field.cpp,v 1.47 2002/11/03 00:41:27 t1mpy Exp $
 ** \sa ID3_Tag
 ** \sa ID3_Frame
 ** \sa ID3_Err
 **/

ID3_FieldImpl::ID3_FieldImpl()
  : _id(ID3FN_NOFIELD),
    _type(ID3FTY_INTEGER),
    _spec_begin(ID3V2_EARLIEST),
    _spec_end(ID3V2_LATEST),
    _flags(0),
    _changed(false),
    _fixed_size(0),
    _num_items(0),
    _enc(ID3TE_NONE)
{
  this->Clear();
}

ID3_FieldImpl::ID3_FieldImpl(const ID3_FieldDef& def)
  : _id(def._id),
    _type(def._type),
    _spec_begin(def._spec_begin),
    _spec_end(def._spec_end),
    _flags(def._flags),
    _changed(false),
    _fixed_size(def._fixed_size),
    _num_items(0),
    _enc((_type == ID3FTY_TEXTSTRING) ? ID3TE_ASCII : ID3TE_NONE)
{
  this->Clear();
}

ID3_FieldImpl::~ID3_FieldImpl()
{
}

/** Clears any data and frees any memory associated with the field
 **
 ** \sa ID3_Tag::Clear()
 ** \sa ID3_Frame::Clear()
 **/
void ID3_FieldImpl::Clear()
{
  switch (_type)
  {
    case ID3FTY_INTEGER:
    {
      _integer = 0;
      break;
    }
    case ID3FTY_BINARY:
    {
      _binary.erase();
      if (_fixed_size > 0)
      {
        _binary.assign(_fixed_size, '\0');
      }
      break;
    }
    case ID3FTY_TEXTSTRING:
    {
      _text.erase();
      if (_fixed_size > 0)
      {
        if (this->GetEncoding() == ID3TE_UNICODE)
        {
          _text.assign(_fixed_size * 2, '\0');
        }
        else if (this->GetEncoding() == ID3TE_ASCII)
        {
          _text.assign(_fixed_size, '\0');
        }
      }
      break;
    }
    default:
    {
      break;
    }
  }
  _changed    = true;

  return ;
}

bool
ID3_FieldImpl::HasChanged() const
{
  return _changed;
}

/** \fn size_t ID3_Field::Size() const
 ** \brief Returns the size of a field.
 **
 ** The value returned is dependent on the type of the field.  For ASCII
 ** strings, this returns the number of characters in the field, not including
 ** any NULL-terminator.  The same holds true for Unicode---it returns the
 ** number of characters in the field, not bytes, and this does not include
 ** the Unicode BOM, which isn't put in a Unicode string obtained by the
 ** Get(unicode_t*, size_t, size_t) method anyway.  For binary and
 ** integer fields, this returns the number of bytes in the field.
 **
 ** \code
 **   size_t howBig = myFrame.GetField(ID3FN_DATA)->Size();
 ** \endcode
 **