1000Hz Tone Generator

Procedure FillSine(audioBuffer: Pointer; sampleToWrite: longint; channels : integer; samleDepth : integer);
var
  nextBufer : PSmallInt;
  sample16    : SmallInt;
  sample32    : integer;
  i, ch       : longint;
begin

  case samleDepth of
    16 :
      begin
        for i:=0 to sampleToWrite-1 do
        begin
          sample16:=Round(24576.0 * sin((i*2.0*PI) / 48.0));
          for ch := 0 to channels-1 do
          begin
            PSmallInt(audioBuffer)^:=sample16;
            inc(PSmallInt(audioBuffer),1);
          end;
        end;
      end;
    32 :
      begin
        for i:=0 to sampleToWrite-1 do
        begin
          sample32:=Round(1610612736.0 * sin((i*2.0*PI) / 48.0));
          for ch := 0 to channels-1 do
          begin
            PInteger(audioBuffer)^:=sample32;
            inc(PInteger(audioBuffer),1);
          end;
        end;
      end;
  end;
end;