I’m working with Black Magic Design (BMD) Decklink input card to acquire HD video signal. They provide C++ Sample with their SDK. I’ve successfully translated the c++ sample into Delphi (VCL). I’ve also isolated the API call in a TDecklink witch I want it to be available to the Delphi community. It work very well in VCL (I can provide the TDecklnk with a demo app to use it if requested).
Now I need to acquire the signal in a FMX form (but not crosscompile to other platform than Windows). I’ve tried to modify the TDecklink to be usable in FMX without success.
In my VCL version, I pass a TPaintBox refference to my TDecklink. The TPaintBox is used by the GraphBuilder as area to display the live video.
Here is some line of code I use in the VCL version to assign the TPaintBox to the GraphBuilder:
pWnd := WindowFromDC(FpboxPreview.Canvas.Handle); //WindowFromDC retreive HWND from HDC
hr:= pIVMRWindowlessCtrl.SetVideoClippingWindow(pWnd); // set the bounds of the video to the preview window
if hr = S_OK then
previewRect.Left := FpboxPreview.Left;
previewRect.Right := FpboxPreview.Width;
previewRect.Top := FpboxPreview.Top;
previewRect.Bottom := FpboxPreview.Height;
hr:= pIVMRWindowlessCtrl.SetVideoPosition(nil, @previewRect); // show the whole of the source frame in the whole of the client area of the control
hr:= pIVMRWindowlessCtrl.SetAspectRatioMode(VMR_ARMODE_LETTER_BOX); // maintain the aspect ratio of the video
hr:= pIVMRWindowlessCtrl.SetBorderColor(GetSysColor(COLOR_BTNFACE)); // set the colour of the letter or pillar boxed area
Where PWnd is a HWND
In FMX, what is the best component and parameter to use to provide what the GraphBuilder expect to receive ?