请高手提供一个视频采集的思路

[zhangyang_cn]

想要在windows下，实现像QQ这样能控制摄像头采集视频数据在窗口中显示，并能截取数个相邻帧的图象数据，希望做过的大虾提供一下思路

[蒋晟]

DirectShow
see the amcap sample in DirectShow SDK

[litangel]

用microsoft的videocap

unit Unit1;

interface

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

type
TForm1 = class(TForm)
Panel1: TPanel;
SaveDialog1: TSaveDialog;
Panel2: TPanel;
OpenVideo: TButton;
CloseVideo: TButton;
SaveBMP: TButton;
StartAVI: TButton;
StopAVI: TButton;
procedure FormCreate(Sender: TObject);
procedure OpenVideoClick(Sender: TObject);
procedure CloseVideoClick(Sender: TObject);
procedure SaveBMPClick(Sender: TObject);
procedure StartAVIClick(Sender: TObject);
procedure StopAVIClick(Sender: TObject);
procedure FormClose(Sender: TObject; var Action: TCloseAction);
private
hWndC : THandle;
CapturingAVI : bool;
{ Private declarations }
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;
const WM_CAP_SEQUENCE_NOFILE =WM_CAP_START+ 63 ;
const WM_CAP_SET_OVERLAY =WM_CAP_START+ 51 ;
const WM_CAP_SET_PREVIEW =WM_CAP_START+ 50 ;
const WM_CAP_SET_CALLBACK_VIDEOSTREAM = WM_CAP_START +6;
const WM_CAP_SET_CALLBACK_ERROR=WM_CAP_START +2;
const WM_CAP_SET_CALLBACK_STATUSA= WM_CAP_START +3;
const WM_CAP_SET_CALLBACK_FRAME= WM_CAP_START +5;
const WM_CAP_SET_SCALE=WM_CAP_START+ 53 ;
const WM_CAP_SET_PREVIEWRATE=WM_CAP_START+ 52 ;
function capCreateCaptureWindowA(lpszWindowName : 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_SET_CALLBACK_VIDEOSTREAM, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_ERROR, 0, 0);
SendMessage(hWndC, WM_CAP_SET_CALLBACK_STATUSA, 0, 0);
SendMessage(hWndC, WM_CAP_DRIVER_CONNECT, 0, 0);
SendMessage(hWndC, WM_CAP_SET_SCALE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEWRATE, 66, 0);
//SendMessage(hWndC, WM_CAP_SEQUENCE_NOFILE, 1, 0);
SendMessage(hWndC, WM_CAP_SET_OVERLAY, 1, 0);
SendMessage(hWndC, WM_CAP_SET_PREVIEW, 1, 0);
OpenVideo.Enabled :=false;
end;

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

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
CloseVideoClick(Sender);
end;

end.

[litangel]

或第三方控件：
dspack
或TVideoGrabber

[Rex_love_Burger]

上面的建议都不错，我是来蹭分的，嘿嘿！

[GARNETT2183]

使用Dspack。。。基于DirectShow的...很简单