TIEMFReceivedSample.DecodeSample
Declaration
function DecodeSample(destBitmap: TIEBitmap): boolean;
Description
Decodes a video sample, filling the specified bitmap with the converted data.
Presently the following conversions are possible:
RGB24 -> RGB24 (copy only)
RGB32 -> RGB24
YUY2 -> RGB24
I420 -> RGB24
NV12 -> RGB24
| Parameter | Description |
| destBitmap | The destination bitmap for the decoded video sample |
Returns True on success. Returns False if the sample is not a video sample or if no decoder is found.
Example 1
// Handler for TImageEnView.OnMediaFoundatioNotify event
procedure TForm1.ImageEnView1MediaFoundationNotify(Sender, MediaFoundationObject: TObject; NotifyType: TIEMediaFountationNotifyType);
var
sample: TIEMFReceivedSample;
begin
if NotifyType = iemfnFRAME then // is this a frame?
begin
sample := ImageEnView1.IO.MediaFoundationSourceReader.GetNextSample(); // retrieve frame sample
try
sample.DecodeSample(ImageEnView1.IEBitmap); // convert frame sample to bitmap
ImageEnView1.Update(); // update TImageEnView to show the new bitmap
finally
sample.Free(); // free the sample
end;
end;
end;
Applications add new decoders by using the
IEMediaFoundationGetVideoSampleDecoders function and implementing the
TIEMediaFoundationVideoSampleDecoder abstract class.
Example 2
IEMediaFoundationGetVideoSampleDecoders().Add(TIEMediaFoundationVideoSampleDecoder_YOURFORMAT.Create());