{

Article: Membuat MP3 Player Sederhana dari Delphi

http://replace.web.id

referensi delphi.about.com

}

unit Unit1;

interface

uses

Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,

StdCtrls, Buttons, MPlayer, ComCtrls, ExtCtrls;

type

TForm1 = class(TForm)

mp3player: TMediaPlayer;

mp3List: TListBox;

btnOpenFolder: TBitBtn;

GroupBox1: TGroupBox;

edTitle: TEdit;

edArtist: TEdit;

edAlbum: TEdit;

edYear: TEdit;

edGenre: TEdit;

edComment: TEdit;

Label1: TLabel;

Label2: TLabel;

Label3: TLabel;

Label4: TLabel;

Label5: TLabel;

Label6: TLabel;

txtFolder: TStaticText;

Progress: TProgressBar;

ProgresTimer: TTimer;

procedure btnOpenFolderClick(Sender: TObject);

procedure mp3ListClick(Sender: TObject);

procedure FormCreate(Sender: TObject);

procedure ProgresTimerTimer(Sender: TObject);

private

{ Private declarations }

public

{ Public declarations }

end;

var

Form1: TForm1;

type

TID3Rec = packed record

Tag     : array[0..2] of Char;

Title,

Artist,

Comment,

Album   : array[0..29] of Char;

Year    : array[0..3] of Char;

Genre   : Byte;

end;

const

MaxID3Genre=147;

ID3Genre: array[0..MaxID3Genre] of string = (

'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',

'Goa', 'Drum & Bass', 'Club-House', 'Hardcore', 'Terror', 'Indie',

'BritPop', 'Negerpunk', 'Polsk Punk', 'Beat', 'Christian Gangsta Rap',

'Heavy Metal', 'Black Metal', 'Crossover', 'Contemporary Christian',

'Christian Rock', 'Merengue', 'Salsa', 'Trash Metal', 'Anime', 'Jpop',

'Synthpop'  {and probably more to come}

);

implementation

uses ShellAPI, ShlObj;  // needed for the BrowseForFolder function

{$R *.DFM}

procedure FillID3TagInformation(mp3File:string; Title,Artist,Album,Year,Genre,Comment:TEdit);

var //fMP3: file of Byte;

ID3 : TID3Rec;

fmp3: TFileStream;

begin

fmp3:=TFileStream.Create(mp3File, fmOpenRead);

try

fmp3.position:=fmp3.size-128;

fmp3.Read(ID3,SizeOf(ID3));

finally

fmp3.free;

end;

{ or the non Stream approach - as in ChangeID3Tag procedure

try

AssignFile(fMP3, mp3File);

Reset(fMP3);

try

Seek(fMP3, FileSize(fMP3) - 128);

BlockRead(fMP3, ID3, SizeOf(ID3));

finally

end;

finally

CloseFile(fMP3);

end;

}

if ID3.Tag <> 'TAG' then begin

Title.Text:='Wrong or no ID3 tag information';

Artist.Text:='Wrong or no ID3 tag information';

Album.Text:='Wrong or no ID3 tag information';

Year.Text:='Wrong or no ID3 tag information';

Genre.Text:='Wrong or no ID3 tag information';

Comment.Text:='Wrong or no ID3 tag information';

end else begin

Title.Text:=ID3.Title;

Artist.Text:=ID3.Artist;

Album.Text:=ID3.Album;

Year.Text:=ID3.Year;

if ID3.Genre in [0..MaxID3Genre] then

Genre.Text:=ID3Genre[ID3.Genre]

else

Genre.Text:=IntToStr(ID3.Genre);

Comment.Text:=ID3.Comment

end;

end;

procedure ChangeID3Tag(NewID3: TID3Rec; mp3FileName: string);

var

fMP3: file of Byte;

OldID3 : TID3Rec;

begin

try

AssignFile(fMP3, mp3FileName);

Reset(fMP3);

try

Seek(fMP3, FileSize(fMP3) - 128);

BlockRead(fMP3, OldID3, SizeOf(OldID3));

if OldID3.Tag = 'TAG' then

{ Replace old tag }

Seek(fMP3, FileSize(fMP3) - 128)

else

{ Append tag to file because it doesn't exist }

Seek(fMP3, FileSize(fMP3));

BlockWrite(fMP3, NewID3, SizeOf(NewID3));

finally

end;

finally

CloseFile(fMP3);

end;

end;

procedure FillMP3FileList(Folder: string; sl: TStrings);

var Rec : TSearchRec;

begin

sl.Clear;

if SysUtils.FindFirst(Folder + '*.mp3', faAnyFile, Rec) = 0 then

try

repeat

sl.Add(Rec.Name);

until SysUtils.FindNext(Rec) <> 0;

finally

SysUtils.FindClose(Rec);

end;

end;

function BrowseDialog(const Title: string; const Flag: integer): string;

var

lpItemID : PItemIDList;

BrowseInfo : TBrowseInfo;

DisplayName : array[0..MAX_PATH] of char;

TempPath : array[0..MAX_PATH] of char;

begin

Result:='';

FillChar(BrowseInfo, sizeof(TBrowseInfo), #0);

with BrowseInfo do begin

hwndOwner := Application.Handle;

pszDisplayName := @DisplayName;

lpszTitle := PChar(Title);

ulFlags := Flag;

end;

lpItemID := SHBrowseForFolder(BrowseInfo);

if lpItemId <> nil then begin

SHGetPathFromIDList(lpItemID, TempPath);

Result := IncludeTrailingBackslash(TempPath);

GlobalFreePtr(lpItemID);

end;

end;

procedure TForm1.btnOpenFolderClick(Sender: TObject);

var mp3Folder : string;

begin

mp3Folder := BrowseDialog('Choose a folder with mp3 files', BIF_RETURNONLYFSDIRS);

if mp3Folder = '' then Exit;

txtFolder.Caption := mp3Folder;

//fill the list box with mp3 files

FillMP3FileList(mp3Folder, mp3List.Items);

end;

procedure TForm1.mp3ListClick(Sender: TObject);

var mp3File:string;

begin

if mp3List.Items.Count=0 then exit;

mp3File := Concat(txtFolder.Caption, mp3List.Items.Strings[mp3List.ItemIndex]);

if not FileExists(mp3File) then begin

ShowMessage('MP3 file '+#13#10+ mp3File +#13#10+'does not exist!');

exit;

end;

FillID3TagInformation(mp3File, edTitle, edArtist, edAlbum, edYear, edGenre, edComment);

Progress.Max:=0;

mp3player.Close;

mp3player.FileName:=mp3File;

mp3player.Open;

Progress.Max := mp3player.Length;

end;

procedure TForm1.FormCreate(Sender: TObject);

begin

txtFolder.Caption := ExtractFilePath(Application.ExeName);

FillMP3FileList(txtFolder.Caption, mp3List.Items);

Progress.Max:=0;

end;

procedure TForm1.ProgresTimerTimer(Sender: TObject);

begin

if Progress.Max<>0 then

Progress.Position := mp3player.Position;

end;

end.