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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,mmsystem, ComCtrls, ExtCtrls, MPlayer;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Label1: TLabel;
    Label2: TLabel;
    Button2: TButton;
    Edit1: TEdit;
    Button3: TButton;
    TrackBar1: TTrackBar;
    Timer1: TTimer;
    Button4: TButton;
    OpenDialog1: TOpenDialog;
    Button5: TButton;
    Label3: TLabel;
    Button6: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure Button4Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure Button5Click(Sender: TObject);
    procedure Button6Click(Sender: TObject);
    
  private
    { Private-Deklarationen }
  public
    { Public-Deklarationen }
  end;

var
  Form1: TForm1;
    x,y,tr:integer;
    str:char;

implementation

{$R *.dfm}
procedure GetVolume(var volL, volR: Word);
var
  hWO: HWAVEOUT;
  waveF: TWAVEFORMATEX;
  vol: DWORD;
begin
  volL:= 0;
  volR:= 0;
  // init TWAVEFORMATEX
  FillChar(waveF, SizeOf(waveF), 0);
  // open WaveMapper = std output of playsound
  waveOutOpen(@hWO, WAVE_MAPPER, @waveF, 0, 0, 0);
  // get volume
  waveOutGetVolume(hWO, @vol);
  volL:= vol and $FFFF;
  volR:= vol shr 16;
  waveOutClose(hWO);
end;

procedure SetVolume(const volL, volR: Word);
var
  hWO: HWAVEOUT;
  waveF: TWAVEFORMATEX;
  vol: DWORD;
begin
  // init TWAVEFORMATEX
  FillChar(waveF, SizeOf(waveF), 0);
  // open WaveMapper = std output of playsound
  waveOutOpen(@hWO, WAVE_MAPPER, @waveF, 0, 0, 0);
  vol:= volL + volR shl 16;
  // set volume
  waveOutSetVolume(hWO, vol);
  waveOutClose(hWO);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  VolLi, VolRe: Word;
begin
  GetVolume(VolLi,VolRe);

  Label1.Caption:=IntToStr(VolLi);
  Label2.Caption:=IntToStr(VolRe);
end;


procedure TForm1.Button2Click(Sender: TObject);
begin
x:= strtoint(edit1.text);
setVolume(x,x);

end;

procedure TForm1.Button3Click(Sender: TObject);
begin
SndPlaySound( Pchar(opendialog1.filename), SND_ASYNC );
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
if trackbar1.position = 0 then x:= 0;
if trackbar1.position = 1 then x:= 10000;
if trackbar1.position = 2 then x:= 20000;
if trackbar1.position = 3 then x:= 30000;
if trackbar1.position = 4 then x:= 40000;
if trackbar1.position = 5 then x:= 50000;
if trackbar1.position = 6 then x:= 60000;
if trackbar1.position = 7 then x:= 65000;
setVolume(x,x);
end;

procedure TForm1.Button4Click(Sender: TObject);
begin
if y = 0 then  begin
  tr:=trackbar1.position;
  trackbar1.Position:=0;
  y:=1;
  end
    else begin
      trackbar1.position:=tr;
      y:=0;
      end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
y:=0;
trackbar1.position:=4;
end;

procedure TForm1.Button5Click(Sender: TObject);
var text:textfile;
 // x:string;

begin
if opendialog1.execute then begin
  if fileexists(opendialog1.FileName) then begin
   //  str:=opendialog1.FileName
   label3.caption:=(opendialog1.FileName);

end;
end;
end;

procedure TForm1.Button6Click(Sender: TObject);
begin
sndPlaySound(nil,0);
end;



end.