private async Task ProcessCurrentVideoFrame()
{
try
{
if (mediaElement.MediaPlayer == null)
{
return;
}
mediaElement.MediaPlayer.takeSnapshot(0, path, InfoSettingFix.FixTakeWidth, InfoSettingFix.FixTakeHeight);
data = File.ReadAllBytes(path);
int byteLength = data.Length;
//Trường hợp data trống và byte 2 Frame liên tiếp bằng nhau
if (data == null || byteLength == 0 || byteLength == this.ByteLength)
{
return;
}
this.ByteLength = byteLength;
CurrentFrame = new CurrentFrameModel()
{
CaptureTime = DateTime.Now,
DataCurrent = data
};
RealtimeFixModel.ListFrame4.Enqueue(CurrentFrame);
data = null;
}
catch (Exception ex)
{
return;
}
CoreUtil.FreeMemory();
}
public async Task <ImageAnalyzer> CaptureFrameAsync(CurrentFrameModel currentFrame)
{
try
{
using (Stream stream = currentFrame.DataCurrent.AsBuffer().AsStream())
{
stream.Position = 0;
var decoder = await BitmapDecoder.CreateAsync(stream.AsRandomAccessStream());
var softwareBitmap = await decoder.GetSoftwareBitmapAsync();
var detector = await FaceDetector.CreateAsync();
using (SoftwareBitmap convertedBitmap = SoftwareBitmap.Convert(softwareBitmap, BitmapPixelFormat.Gray8))
{
faces = await detector.DetectFacesAsync(convertedBitmap, SearchArea);
convertedBitmap.Dispose();
}
this.NumFacesOnLastFrame = faces.Count();
var previewFrameSize = new Windows.Foundation.Size(softwareBitmap.PixelWidth, softwareBitmap.PixelHeight);
this.ShowFaceTrackingVisualization(previewFrameSize, faces);
softwareBitmap.Dispose();
stream.Dispose();
}
//Không có face thì không phân tích
if (this.NumFacesOnLastFrame == 0)
{
faces = null;
CoreUtil.FreeMemory();
return(null);
}
//Hai khung hình có số lượng khung mật giống nhau quá nửa thì không phân tích nữa
if (this.AreFacesStill(this.detectedFacesFromPreviousFrame, faces))
{
faces = null;
CoreUtil.FreeMemory();
return(null);
}
this.detectedFacesFromPreviousFrame = faces;
imageWithFace = new ImageAnalyzer(currentFrame.DataCurrent);
imageWithFace.CameraIPAdres = CameraIPAdres;
imageWithFace.imageWidth = InfoSettingFix.FixImageWidth;
imageWithFace.imageHeight = InfoSettingFix.FixImageHeight;
imageWithFace.CaptureTime = currentFrame.CaptureTime;
imageWithFace.ListDetectedFaceJson = JsonConvert.SerializeObject(faces.Select(r => r.FaceBox).ToList());
faces = null;
CoreUtil.FreeMemory();
return(imageWithFace);
}
catch (Exception ex)
{
CoreUtil.FreeMemory();
return(null);
}
}
