2013-01-01 13:29:34 +01:00
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{$APPTYPE CONSOLE}
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program OpenCV_2_LoadVideo;
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uses
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core_c in '..\..\include\сore\core_c.pas',
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core.types_c in '..\..\include\сore\core.types_c.pas',
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highgui_c in '..\..\include\highgui\highgui_c.pas';
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const
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// declare video filename
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2013-01-01 22:36:38 +01:00
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VIDEO_FILE_NAME = '768x576.avi';
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2013-01-01 13:29:34 +01:00
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// declare escape char
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ESCAPE_CHAR = 27;
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var
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// declate an opencv video file capture object, users can use this object to
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// interact with the video file, get/set properties and also grab video frames
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capture: pCVCapture;
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// declare an opencv image pointer variable
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frame: pIplImage;
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// declate a key variable to get user key pressed
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key: integer;
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begin
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// create capture object for specific video filename
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capture := cvCreateFileCapture(VIDEO_FILE_NAME);
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// check if capture assigned, if not then it means that opencv can not open
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// the requested file, opencv uses VFW to open the files so some file formats
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// are not fully supported (can be enhence with FFMPEG support but this is
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// beyond our scope right now
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if Assigned(capture) then
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begin
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// create display window
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cvNamedWindow('video');
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// reset user key pressed
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key := 0;
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// loop while user didn't press ESCAPE
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while key <> ESCAPE_CHAR do
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begin
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// start grabbing frames, single frame at a time, this method is a
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// combination of two methods one grab frame and the other advances to the
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// next frame
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//
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// REMARK: do not (!!!) release "frame" object since it is used internally
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// by the capture object is its memory is release when the "capture" object
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// is being destroyed
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frame := cvQueryFrame(capture);
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// check if frame is valid, when you reach end-of-file "frame" object
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// starts to be NIL (since the method advances to the next frame each time
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// is is called...)
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if Assigned(frame) then
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// show frame in window
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cvShowImage('video', frame);
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// wait for user key, delay is in msec so 1000msec = 1sec wait period
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key := cvWaitKey(1000);
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end;
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// destroy display windows
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cvDestroyAllWindows;
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// release "capture" object and its related memory
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cvReleaseCapture(capture);
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end;
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end.
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