Informacje o utworach MP3

Aby pobrać informacje na temat wykonawcy, tytułu, albumu, roku wydania oraz gatunku utworu z pliku MP3 to musimy odczytać jego ostatnie sektory. Ze względu na rozbudowaną strukturę tagów proponuję utworzyć osobny plik, w którym będzie znajdować się funkcją pobierająca dane …

Oto jego kod źródłowy :

unit ID3;


interface


{$A+} { Honor packed }

{$Z1} { Byte storage for small enumerated types }



type

  //wykaz gatunków

  ID3Genre = (

    id3gBlues, id3gClassicRock, id3gCountry, 

    id3gDance, id3gDisco,id3gFunk, id3gGrunge,

    id3gHipHop, id3gJazz, id3gMetal, id3gNewAge,

    id3gOldies, id3gOther, id3gPop, id3gRNB, 

    id3gRap, id3gReggae,id3gRock, id3gTechno, 

    id3gIndustrial, id3gAlternative, id3gSka,

    id3gDeathMetal, id3gPranks, id3gSoundtrack,

    id3gEuroTechno,id3gAmbient, id3gTripHop, 

    id3gVocal, id3gJazzFunk, id3gFusion,id3gTrance,

    id3gClassical, id3gInstrumental, id3gAcid, 

    id3gHouse, id3gGame, id3gSoundClip, id3gGospel,

    id3gNoise, id3gAlternRock, id3gBass, id3gSoul,

    id3gPunk, id3gSpace, id3gMeditative, 

    id3gInstrumentalPop, id3gInstrumentalRock, 

    id3gEthnic, id3gGothic,id3gDarkwave, 

    id3gTechnoIndustrial, id3gElectronic, id3gPopFolk,

    id3gEurodance, id3gDream, id3gSouthernRock,

    id3gComedy, id3gCult, id3gGangsta, id3gTop40, 

    id3gChristianRap, id3gPopFunk, id3gJungle,

    id3gNativeAmerican, id3gCabaret, id3gNewWave,

    id3gPsychadelic, id3gRave, id3gShowtunes, id3gTrailer,

    id3gLoFi, id3gTribal, id3gAcidPunk, id3gAcidJazz, 

    id3gPolka, id3gRetro, id3gMusical, id3gRockNRoll,

    id3gHardRock, id3gFolk, id3gFolkRock,

    id3gNationalFolk, id3gSwing, id3gFastFusion, 

    id3gBebob, id3gLatin, id3gRevival, id3gCeltic, 

    id3gBluegrass, id3gAvantgarde, id3gGothicRock, 

    id3gProgressiveRock, id3gPsychedelicRock, id3gSymphonicRock,

    id3gSlowRock, id3gBigBand, id3gChorus, id3gEasyListening,

    id3gAcoustic, id3gHumour, id3gSpeech, id3gChanson,

    id3gOpera, id3gChamberMusic, id3gSonata, id3gSymphony,

    id3gBootyBass, id3gPrimus, id3gPornGroove, id3gSatire,

    id3gSlowJam, id3gClub, id3gTango, id3gSamba, id3gFolklore,

    id3gBallad,id3gPowerBallad, id3gRhythmicSoul, id3gFreestyle,

    id3gDuet, id3gPunkRock, id3gDrumSolo, id3gAcapella,

    id3gEuroHouse, id3gDanceHall

    );


  ID3Struct = packed record

    Magic: array [0..2 ] of Char; //identyfikator

    Title: array [0..29] of Char; //tytuł

    Artist: array [0..29] of Char; //artysta

    Album: array [0..29] of Char; //album

    Year: array [0..3 ] of Char; //rok

    Comment: array [0..29] of Char; //komentarz

    Genre: ID3Genre; // gatunek

  end;


const

  ID3Magic = 'TAG';

  ID3OffsetFromEnd = 128;

  //odległość od końca pliku zarezerwowana dla tagów

   

  ID3UnknowGenre = ID3Genre(255); // nieznany gatunek

  

  //tablica gatunków

  ID3GenreName: array [ID3Genre] of PChar = (

    'Blues', 'Classic Rock', 'Country', 'Dance', 

    'Disco', 'Funk', 'Grunge', 'Hip-Hop', 'Jazz',

    'Metal', 'New Age', 'Oldies', 'Other', 'Pop',

    'R&B', 'Rap', 'Reggae', 'Rock', 'Techno',

    'Industrial', 'Alternative', 'Ska', 'Death Metal',

    'Pranks', 'Soundtrack', 'Euro-Techno', 'Ambient',

    'Trip-Hop', 'Vocal', 'Jazz+Funk', 'Fusion', 'Trance',

    'Classical', 'Instrumental', 'Acid', 'House', 

    'Game', 'Sound Clip', 'Gospel', 'Noise', 'AlternRock',

    'Bass', 'Soul', 'Punk', 'Space', 'Meditative',

    'Instrumental Pop', 'Instrumental Rock', 'Ethnic',

    'Gothic', 'Darkwave', 'Techno-Industrial', 'Electronic',

    'Pop-Folk', 'Eurodance', 'Dream', 'Southern Rock', 

    'Comedy', 'Cult', 'Gangsta', 'Top 40', 'Christian Rap',

    'Pop/Funk', 'Jungle', 'Native American', 'Cabaret', 

    'New Wave', 'Psychadelic', 'Rave', 'Showtunes', 'Trailer',

    'Lo-Fi', 'Tribal', 'Acid Punk', 'Acid Jazz', 'Polka', 

    'Retro', 'Musical', 'Rock & Roll', 'Hard Rock', 'Folk',

    'Folk-Rock', 'National Folk', 'Swing', 'Fast Fusion', 

    'Bebob', 'Latin', 'Revival', 'Celtic', 'Bluegrass', 

    'Avantgarde', 'Gothic Rock', 'Progressive Rock', 

    'Psychedelic Rock', 'Symphonic Rock', 'Slow Rock', 

    'Big Band', 'Chorus', 'Easy Listening', 'Acoustic', 

    'Humour', 'Speech', 'Chanson', 'Opera', 'Chamber Music',

    'Sonata', 'Symphony', 'Booty Bass', 'Primus', 'Porn Groove',

    'Satire', 'Slow Jam', 'Club', 'Tango', 'Samba',

    'Folklore', 'Ballad', 'Power Ballad', 'Rhythmic Soul', 

    'Freestyle', 'Duet', 'Punk Rock', 'Drum Solo', 'Acapella',

    'Euro-House', 'Dance Hall'

    );


function GetMP3Infos(FN:String): id3struct; // FN - nazwa pliku


implementation


function GetMP3Infos(FN:String): id3struct;

var

  F: File of Byte;

  Tag: ID3Struct;

  HasTag: Boolean;

  GenreName: String;

  NewFN: String;

const

  Tab = #9;

begin

  AssignFile(F, fn);

  try

    Reset(F);

    try

      Seek(F, FileSize(F) - ID3OffsetFromEnd);

      BlockRead(F, Tag, SizeOf(Tag));

      HasTag := Tag.Magic = ID3Magic;

      if not HasTag then 

      begin

        FillChar(Tag, Sizeof(Tag), ' ');

        Tag.Magic := ID3Magic;

        Tag.Genre := ID3UnknowGenre;

      end;

      CloseFile(f);

      Result:=Tag;

    except

    end;

  except

  end;

end;


end.

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unit ID3;

interface

{$A+} { Honor packed }

{$Z1} { Byte storage for small enumerated types }

type

//wykaz gatunków

ID3Genre = (

id3gBlues, id3gClassicRock, id3gCountry,

id3gDance, id3gDisco,id3gFunk, id3gGrunge,

id3gHipHop, id3gJazz, id3gMetal, id3gNewAge,

id3gOldies, id3gOther, id3gPop, id3gRNB,

id3gRap, id3gReggae,id3gRock, id3gTechno,

id3gIndustrial, id3gAlternative, id3gSka,

id3gDeathMetal, id3gPranks, id3gSoundtrack,

id3gEuroTechno,id3gAmbient, id3gTripHop,

id3gVocal, id3gJazzFunk, id3gFusion,id3gTrance,

id3gClassical, id3gInstrumental, id3gAcid,

id3gHouse, id3gGame, id3gSoundClip, id3gGospel,

id3gNoise, id3gAlternRock, id3gBass, id3gSoul,

id3gPunk, id3gSpace, id3gMeditative,

id3gInstrumentalPop, id3gInstrumentalRock,

id3gEthnic, id3gGothic,id3gDarkwave,

id3gTechnoIndustrial, id3gElectronic, id3gPopFolk,

id3gEurodance, id3gDream, id3gSouthernRock,

id3gComedy, id3gCult, id3gGangsta, id3gTop40,

id3gChristianRap, id3gPopFunk, id3gJungle,

id3gNativeAmerican, id3gCabaret, id3gNewWave,

id3gPsychadelic, id3gRave, id3gShowtunes, id3gTrailer,

id3gLoFi, id3gTribal, id3gAcidPunk, id3gAcidJazz,

id3gPolka, id3gRetro, id3gMusical, id3gRockNRoll,

id3gHardRock, id3gFolk, id3gFolkRock,

id3gNationalFolk, id3gSwing, id3gFastFusion,

id3gBebob, id3gLatin, id3gRevival, id3gCeltic,

id3gBluegrass, id3gAvantgarde, id3gGothicRock,

id3gProgressiveRock, id3gPsychedelicRock, id3gSymphonicRock,

id3gSlowRock, id3gBigBand, id3gChorus, id3gEasyListening,

id3gAcoustic, id3gHumour, id3gSpeech, id3gChanson,

id3gOpera, id3gChamberMusic, id3gSonata, id3gSymphony,

id3gBootyBass, id3gPrimus, id3gPornGroove, id3gSatire,

id3gSlowJam, id3gClub, id3gTango, id3gSamba, id3gFolklore,

id3gBallad,id3gPowerBallad, id3gRhythmicSoul, id3gFreestyle,

id3gDuet, id3gPunkRock, id3gDrumSolo, id3gAcapella,

id3gEuroHouse, id3gDanceHall

);

ID3Struct = packed record

Magic: array [0..2 ] of Char; //identyfikator

Title: array [0..29] of Char; //tytuł

Artist: array [0..29] of Char; //artysta

Album: array [0..29] of Char; //album

Year: array [0..3 ] of Char; //rok

Comment: array [0..29] of Char; //komentarz

Genre: ID3Genre; // gatunek

end;

const

ID3Magic = 'TAG';

ID3OffsetFromEnd = 128;

//odległość od końca pliku zarezerwowana dla tagów

ID3UnknowGenre = ID3Genre(255); // nieznany gatunek

//tablica gatunków

ID3GenreName: array [ID3Genre] of PChar = (

'Blues', 'Classic Rock', 'Country', 'Dance',

'Disco', 'Funk', 'Grunge', 'Hip-Hop', 'Jazz',

'Metal', 'New Age', 'Oldies', 'Other', 'Pop',

'R&B', 'Rap', 'Reggae', 'Rock', 'Techno',

'Industrial', 'Alternative', 'Ska', 'Death Metal',

'Pranks', 'Soundtrack', 'Euro-Techno', 'Ambient',

'Trip-Hop', 'Vocal', 'Jazz+Funk', 'Fusion', 'Trance',

'Classical', 'Instrumental', 'Acid', 'House',

'Game', 'Sound Clip', 'Gospel', 'Noise', 'AlternRock',

'Bass', 'Soul', 'Punk', 'Space', 'Meditative',

'Instrumental Pop', 'Instrumental Rock', 'Ethnic',

'Gothic', 'Darkwave', 'Techno-Industrial', 'Electronic',

'Pop-Folk', 'Eurodance', 'Dream', 'Southern Rock',

'Comedy', 'Cult', 'Gangsta', 'Top 40', 'Christian Rap',

'Pop/Funk', 'Jungle', 'Native American', 'Cabaret',

'New Wave', 'Psychadelic', 'Rave', 'Showtunes', 'Trailer',

'Lo-Fi', 'Tribal', 'Acid Punk', 'Acid Jazz', 'Polka',

'Retro', 'Musical', 'Rock & Roll', 'Hard Rock', 'Folk',

'Folk-Rock', 'National Folk', 'Swing', 'Fast Fusion',

'Bebob', 'Latin', 'Revival', 'Celtic', 'Bluegrass',

'Avantgarde', 'Gothic Rock', 'Progressive Rock',

'Psychedelic Rock', 'Symphonic Rock', 'Slow Rock',

'Big Band', 'Chorus', 'Easy Listening', 'Acoustic',

'Humour', 'Speech', 'Chanson', 'Opera', 'Chamber Music',

'Sonata', 'Symphony', 'Booty Bass', 'Primus', 'Porn Groove',

'Satire', 'Slow Jam', 'Club', 'Tango', 'Samba',

'Folklore', 'Ballad', 'Power Ballad', 'Rhythmic Soul',

'Freestyle', 'Duet', 'Punk Rock', 'Drum Solo', 'Acapella',

'Euro-House', 'Dance Hall'

);

function GetMP3Infos(FN:String): id3struct; // FN - nazwa pliku

implementation

function GetMP3Infos(FN:String): id3struct;

var

F: File of Byte;

Tag: ID3Struct;

HasTag: Boolean;

GenreName: String;

NewFN: String;

const

Tab = #9;

begin

AssignFile(F, fn);

try

Reset(F);

try

Seek(F, FileSize(F) - ID3OffsetFromEnd);

BlockRead(F, Tag, SizeOf(Tag));

HasTag := Tag.Magic = ID3Magic;

if not HasTag then

begin

FillChar(Tag, Sizeof(Tag), ' ');

Tag.Magic := ID3Magic;

Tag.Genre := ID3UnknowGenre;

end;

CloseFile(f);

Result:=Tag;

except

end;

except

end;

end.

Autor: Nakiel