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favinc2005-10-12 02:01:56
unit main;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, DSUtil, StdCtrls, DSPack, DirectShow9, Menus, ExtCtrls;
type
TVideoForm = class(TForm)
FilterGraph: TFilterGraph;
VideoWindow: TVideoWindow;
MainMenu1: TMainMenu;
Devices: TMenuItem;
Filter: TFilter;
Image: TImage;
SampleGrabber: TSampleGrabber;
SnapShot: TButton;
CallBack: TCheckBox;
procedure FormCreate(Sender: TObject);
procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
procedure SnapShotClick(Sender: TObject);
procedure SampleGrabberBuffer(sender: TObject; SampleTime: Double;
pBuffer: PByte; BufferLen: Integer);
private
public
procedure OnSelectDevice(sender: TObject);
end;
var
VideoForm: TVideoForm;
SysDev: TSysDevEnum;
implementation
{$R *.dfm}
procedure TVideoForm.FormCreate(Sender: TObject);
var
i: integer;
Device: TMenuItem;
begin
SysDev:= TSysDevEnum.Create(CLSID_VideoInputDeviceCategory);
if SysDev.CountFilters > 0 then
for i := 0 to SysDev.CountFilters - 1 do
begin
Device := TMenuItem.Create(Devices);
Device.Caption := SysDev.Filters[i].FriendlyName;
Device.Tag := i;
Device.OnClick := OnSelectDevice;
Devices.Add(Device);
end;
end;
procedure TVideoForm.OnSelectDevice(sender: TObject);
begin
FilterGraph.ClearGraph;
FilterGraph.Active := false;
Filter.BaseFilter.Moniker := SysDev.GetMoniker(TMenuItem(Sender).tag);
FilterGraph.Active := true;
with FilterGraph as ICaptureGraphBuilder2 do
RenderStream(@PIN_CATEGORY_PREVIEW, nil, Filter as IBaseFilter, SampleGrabber as IBaseFilter, VideoWindow as IbaseFilter);
FilterGraph.Play;
end;
procedure TVideoForm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
SysDev.Free;
FilterGraph.ClearGraph;
FilterGraph.Active := false;
end;
procedure TVideoForm.SnapShotClick(Sender: TObject);
begin
[red] SampleGrabber.GetBitmap(Image.Picture.Bitmap);[/red]
end;
procedure TVideoForm.SampleGrabberBuffer(sender: TObject;
SampleTime: Double; pBuffer: PByte; BufferLen: Integer);
begin
if CallBack.Checked then
begin
Image.Canvas.Lock;
try
[red] SampleGrabber.GetBitmap(Image.Picture.Bitmap, pBuffer, BufferLen);[/red]
finally
Image.Canvas.Unlock;
end;
end;
end;
end.
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