private async void ProcessCurrentVideoFrame(DispatcherTimer timer)
{
if (captureManager.CameraStreamState != Windows.Media.Devices.CameraStreamState.Streaming)
{
return;
}
if (!await frameProcessingSemaphore.WaitAsync(250))
{
return;
}
try
{
IEnumerable <DetectedFace> faces = null;
// Create a VideoFrame object specifying the pixel format we want our capture image to be (NV12 bitmap in this case).
// GetPreviewFrame will convert the native webcam frame into this format.
const BitmapPixelFormat InputPixelFormat = BitmapPixelFormat.Nv12;
using (VideoFrame previewFrame = new VideoFrame(InputPixelFormat, (int)this.videoProperties.Width, (int)this.videoProperties.Height))
{
await this.captureManager.GetPreviewFrameAsync(previewFrame);
// The returned VideoFrame should be in the supported NV12 format but we need to verify this.
if (FaceDetector.IsBitmapPixelFormatSupported(previewFrame.SoftwareBitmap.BitmapPixelFormat))
{
faces = await this.faceTracker.ProcessNextFrameAsync(previewFrame);
if (this.FilterOutSmallFaces)
{
// We filter out small faces here.
faces = faces.Where(f => CoreUtil.IsFaceBigEnoughForDetection((int)f.FaceBox.Height, (int)this.videoProperties.Height));
}
this.NumFacesOnLastFrame = faces.Count();
if (this.EnableAutoCaptureMode)
{
this.UpdateAutoCaptureState(faces);
}
// Create our visualization using the frame dimensions and face results but run it on the UI thread.
var previewFrameSize = new Windows.Foundation.Size(previewFrame.SoftwareBitmap.PixelWidth, previewFrame.SoftwareBitmap.PixelHeight);
var ignored = this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
this.ShowFaceTrackingVisualization(previewFrameSize, faces);
});
}
}
}
catch (Exception x)
{
Debug.WriteLine(x.Message);
}
finally
{
frameProcessingSemaphore.Release();
}
}
private async void ProcessCurrentVideoFrame(ThreadPoolTimer timer)
{
if (captureManager.CameraStreamState != CameraStreamState.Streaming ||
!frameProcessingSemaphore.Wait(0))
{
return;
}
try
{
IEnumerable <DetectedFace> faces = null;
// Create a VideoFrame object specifying the pixel format we want our capture image to be (NV12 bitmap in this case).
// GetPreviewFrame will convert the native webcam frame into this format.
const BitmapPixelFormat InputPixelFormat = BitmapPixelFormat.Nv12;
using (VideoFrame currentFrame = new VideoFrame(InputPixelFormat, (int)videoProperties.Width, (int)videoProperties.Height))
{
await captureManager.GetPreviewFrameAsync(currentFrame);
// The returned VideoFrame should be in the supported NV12 format but we need to verify this.
if (FaceDetector.IsBitmapPixelFormatSupported(currentFrame.SoftwareBitmap.BitmapPixelFormat))
{
faces = await faceTracker.ProcessNextFrameAsync(currentFrame);
if (FilterOutSmallFaces)
{
// We filter out small faces here.
faces = faces.Where(f => CoreUtil.IsFaceBigEnoughForDetection((int)f.FaceBox.Height, (int)videoProperties.Height));
}
NumFacesOnLastFrame = faces.Count();
if (EnableAutoCaptureMode)
{
UpdateAutoCaptureState(faces);
}
// Create our visualization using the frame dimensions and face results but run it on the UI thread.
var currentFrameSize = new Windows.Foundation.Size(currentFrame.SoftwareBitmap.PixelWidth, currentFrame.SoftwareBitmap.PixelHeight);
var rgbaBitmap = SoftwareBitmap.Convert(currentFrame.SoftwareBitmap, BitmapPixelFormat.Rgba8);
HandleFaces(currentFrameSize, faces, rgbaBitmap);
}
}
}
catch (Exception)
{
}
finally
{
frameProcessingSemaphore.Release();
}
}
private async void ProcessCurrentVideoFrame(ThreadPoolTimer timer)
{
if (captureManager.CameraStreamState != Windows.Media.Devices.CameraStreamState.Streaming ||
!frameProcessingSemaphore.Wait(0))
{
return;
}
try
{
IEnumerable <DetectedFace> faces = null;
const BitmapPixelFormat InputPixelFormat = BitmapPixelFormat.Nv12;
using (VideoFrame previewFrame = new VideoFrame(InputPixelFormat, (int)this.videoProperties.Width, (int)this.videoProperties.Height))
{
await this.captureManager.GetPreviewFrameAsync(previewFrame);
if (FaceDetector.IsBitmapPixelFormatSupported(previewFrame.SoftwareBitmap.BitmapPixelFormat))
{
faces = await this.faceTracker.ProcessNextFrameAsync(previewFrame);
if (this.FilterOutSmallFaces)
{
faces = faces.Where(f => CoreUtil.IsFaceBigEnoughForDetection((int)f.FaceBox.Height, (int)this.videoProperties.Height));
}
this.NumFacesOnLastFrame = faces.Count();
if (this.EnableAutoCaptureMode)
{
this.UpdateAutoCaptureState(faces);
}
var previewFrameSize = new Windows.Foundation.Size(previewFrame.SoftwareBitmap.PixelWidth, previewFrame.SoftwareBitmap.PixelHeight);
var ignored = this.Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, () =>
{
this.ShowFaceTrackingVisualization(previewFrameSize, faces);
});
}
}
}
catch (Exception)
{
}
finally
{
frameProcessingSemaphore.Release();
}
}
