TImageEnIO.DShowParams

Declaration

property DShowParams: TIEDirectShow;

Description

DShowParams is a TIEDirectShow instance which allows control of some Direct Show features, such as video capture, audio capture, multimedia files capture as well video rendering, and multimedia file writing.

Demos

Note: To use DShowParams, You must use a TImageEnView with a parent

Examples

Capture Skeleton

// Fills ComboBox1 with the names of all video capture inputs
ComboBox1.Items.Assign( ImageEnView1.IO.DShowParams.VideoInputs );

// Select the first video input available
ImageEnView1.IO.DShowParams.SetVideoInput( 0 );

// Enables frame grabbing
// ImageEnView1.OnDShowNewFrame event occurs for each frame acquired
ImageEnView1.IO.DShowParams.EnableSampleGrabber := True;

// connect to the video input: this begins video capture
ImageEnView1.IO.DShowParams.Connect;

...

// Disconnect the video input
ImageEnView1.IO.DShowParams.Disconnect;

Capture a frame

// We are inside the OnDShowNewFrame event:
procedure Tfmain.ImageEnView1DShowNewFrame(Sender: TObject);
begin
   // copy current sample to ImageEnView bitmap
   ImageEnView1.IO.DShowParams.GetSample(ImageEnView1.IEBitmap);
   // refresh ImageEnView1
   ImageEnView1.Update();
end;

Setting video capture size

// We'd like to acquire 640x480 frames
ImageEnView1.IO.DShowParams.SetCurrentVideoFormat( 640, 480, '' );

Select a TV Tuner channel

// We want channel 15
ImageEnView1.IO.DShowParams.TunerChannel := 15;

Showing capture card dialogs

// Show video dialog
ImageEnView1.IO.DShowParams.ShowPropertyPages(iepVideoInput, ietFilter);

// Show video source dialog
ImageEnView1.IO.DShowParams.ShowPropertyPages(iepVideoInputSource, ietFilter);

// Show tuner dialog
ImageEnView1.IO.DShowParams.ShowPropertyPages(iepTuner, ietFilter);

// Show format dialog
ImageEnView1.IO.DShowParams.ShowPropertyPages(iepVideoInput, ietOutput);

// Read from a multimedia file, and save with another compression

ImageEnView1.IO.DShowParams.FileInput := 'input.avi';
ImageEnView1.IO.DShowParams.FileOutput := 'output.avi';
ImageEnView1.IO.DShowParams.SetVideoCodec( ... );
ImageEnView1.IO.DShowParams.SetAudioCodec( ... );

ImageEnView1.IO.DShowParams.EnableSampleGrabber := True;
ImageEnView1.IO.DShowParams.Connect;

See the \VideoCapture\DirectShow1\ and \VideoCapture\DirectShow2\ demos for more info.

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