Описание исходника обработки видео

[Morphling]

Имеется исходник программы, который я напишу ниже. Люди добрые пожалуйста, помогите мне его описать??? Надо срочно курсовую докончить . Заранее благодарен))
unit Unit1;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms,
Dialogs, ExtCtrls, StdCtrls;

type
TForm1 = class(TForm)
Panel1: TPanel;
OpenVideo: TButton;
CloseVideo: TButton;
GrabFrame: TButton;
SaveBMP: TButton;
StartAVI: TButton;
StopAVI: TButton;
SaveDialog1: TSaveDialog;
procedure FormCreate(Sender: TObject);
procedure OpenVideoClick(Sender: TObject);
procedure CloseVideoClick(Sender: TObject);
procedure GrabFrameClick(Sender: TObject);
procedure SaveBMPClick(Sender: TObject);
procedure StartAVIClick(Sender: TObject);
procedure StopAVIClick(Sender: TObject);
private
{ Private declarations }
hWndC: THandle;
CapturingAVI: bool;
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.DFM}

const
WM_CAP_START = WM_USER;
const
WM_CAP_STOP = WM_CAP_START + 68;
const
WM_CAP_DRIVER_CONNECT = WM_CAP_START + 10;
const
WM_CAP_DRIVER_DISCONNECT = WM_CAP_START + 11;
const
WM_CAP_SAVEDIB = WM_CAP_START + 25;
const
WM_CAP_GRAB_FRAME = WM_CAP_START + 60;
const
WM_CAP_SEQUENCE = WM_CAP_START + 62;
const
WM_CAP_FILE_SET_CAPTURE_FILEA = WM_CAP_START + 20;

function capCreateCaptureWindowA(lpszWindowN ame: PCHAR;
dwStyle: longint;
x: integer;
y: integer;
nWidth: integer;
nHeight: integer;
ParentWin: HWND;
nId: integer): HWND;
stdcall external 'AVICAP32.DLL';

procedure TForm1.FormCreate(Sender: TObject);
begin
CapturingAVI := false;
hWndC := 0;
SaveDialog1.Options :=
[ofHideReadOnly, ofNoChangeDir, ofPathMustExist]
end;

procedure TForm1.OpenVideoClick(Sender: TObject);
begin
hWndC := capCreateCaptureWindowA('My Own Capture Window',
WS_CHILD or WS_VISIBLE,
Panel1.Left,
Panel1.Top,
Panel1.Width,
Panel1.Height,
Form1.Handle,
0);
if hWndC <> 0 then
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
end;

procedure TForm1.CloseVideoClick(Sender: TObject);
begin
if hWndC <> 0 then
begin
SendMessage(hWndC, WM_CAP_DRIVER_DISCONNECT, 0, 0);
hWndC := 0;
end;
end;

procedure TForm1.GrabFrameClick(Sender: TObject);
begin
if hWndC <> 0 then
SendMessage(hWndC, WM_CAP_GRAB_FRAME, 0, 0);
end;

procedure TForm1.SaveBMPClick(Sender: TObject);
begin
if hWndC <> 0 then
begin
SaveDialog1.DefaultExt := 'bmp';
SaveDialog1.Filter := 'Bitmap files (*.bmp)|*.bmp';
if SaveDialog1.Execute then
SendMessage(hWndC,
WM_CAP_SAVEDIB,
0,
longint(pchar(SaveDialog1.FileName) ));
end;
end;

procedure TForm1.StartAVIClick(Sender: TObject);
begin
if hWndC <> 0 then
begin
SaveDialog1.DefaultExt := 'avi';
SaveDialog1.Filter := 'AVI files (*.avi)|*.avi';
if SaveDialog1.Execute then
begin
CapturingAVI := true;
SendMessage(hWndC,
WM_CAP_FILE_SET_CAPTURE_FILEA,
0,
Longint(pchar(SaveDialog1.FileName) ));
SendMessage(hWndC, WM_CAP_SEQUENCE, 0, 0);
end;
end;
end;

procedure TForm1.StopAVIClick(Sender: TObject);
begin
if hWndC <> 0 then
begin
SendMessage(hWndC, WM_CAP_STOP, 0, 0);
CapturingAVI := false;
end;
end;

end.