Mega Code Archive
Play sound through the PC Speaker
<![CDATA[
Title: play sound through the PC Speaker?
{
Windows NT/2000/XP:
Windows.Beep(dwFreq, dwDuration);
dwFreq : frequency, in hertz, of the sound.
dwDuration : duration, in milliseconds, of the sound.
}
// Windows 9x/NT-Platforms:
procedure SetPort(address, Value: Word);
var
bValue: Byte;
begin
bValue := trunc(Value and 255);
asm
mov dx, address
mov al, bValue
out dx, al
end;
end;
function GetPort(address: Word): Word;
var
bValue: Byte;
begin
asm
mov dx, address
in al, dx
mov bValue, al
end;
GetPort := bValue;
end;
procedure Sound(aFreq, aDelay: Integer);
procedure DoSound(Freq: Word);
var
B: Byte;
begin
if Freq 18 then
begin
Freq := Word(1193181 div Longint(Freq));
B := Byte(GetPort($61));
if (B and 3) = 0 then
begin
SetPort($61, Word(B or 3));
SetPort($43, $B6);
end;
SetPort($42, Freq);
SetPort($42, Freq shr 8);
end;
end;
procedure Delay(MSecs: Integer);
var
FirstTickCount: LongInt;
begin
FirstTickCount := GetTickCount;
repeat
Sleep(1);
//or use Application.ProcessMessages instead of Sleep
until ((GetTickCount - FirstTickCount) = Longint(MSecs));
end;
begin
if Win32Platform = VER_PLATFORM_WIN32_NT then
begin
Windows.Beep(aFreq, aDelay);
end
else
begin
DoSound(aFreq);
Delay(aDelay);
end;
end;
procedure NoSound;
var
Value: Word;
begin
if not (Win32Platform = VER_PLATFORM_WIN32_NT) then
begin
Value := GetPort($61) and $FC;
SetPort($61, Value);
end;
end;
// Example:
procedure TForm1.Button1Click(Sender: TObject);
begin
Sound(500, 1000);
Sound(700, 1000);
Sound(900, 1000);
NoSound;
end;
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