private void ExampleMediaCapture_FaceDetected(ExampleMediaCapture sender, FaceAnalysis.FaceDetectedEventArgs args)
{
if (args.ResultFrame.SystemRelativeTime.HasValue &&
args.ResultFrame.DetectedFaces.Any() &&
args.ResultFrame.DetectedFaces.Count <= MaxDetectedFaces)
{
DetectedFaceEpochs.Enqueue(args.ResultFrame.SystemRelativeTime.Value);
Update(args.ResultFrame.SystemRelativeTime.Value);
}
}
/// <summary>
/// Initializes ExampleMediaCapture and FrameReader.
/// Turns camera on and sets camera preview.
/// </summary>
/// <returns></returns>
public async Task InitializeAsync()
{
MediaCapture = new ExampleMediaCapture();
await MediaCapture.InitializeAsync();
CaptureElement.Source = MediaCapture.PreviewMediaCapture;
CaptureElement.FlowDirection = MediaCapture.PreviewFlowDirection;
await MediaCapture.StartPreviewAsync();
FrameReader = await MediaCapture.CreateFrameReaderAsync();
FrameReader.AcquisitionMode = MediaFrameReaderAcquisitionMode.Buffered;
FrameReader.FrameArrived += FrameArrivedEvent;
await FrameReader.StartAsync();
}
private async Task StartOperationAsync()
{
CollectedColorFrames = new ConcurrentBag <ExampleMediaFrame>();
CollectedNonIlluminatedInfraredFrames = new ConcurrentBag <ExampleMediaFrame>();
CollectedIlluminatedInfraredFrames = new ConcurrentBag <ExampleMediaFrame>();
Stopwatch = new Stopwatch();
WrittenToDiskFramesCount = 0;
// Open the capture object to pump the frames to UI preview element
// More information, including how to keep the display on:
// https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/simple-camera-preview-access
// ExampleMediaCapture interface is based on Windows.Media.Capture.MediaCapture
// https://docs.microsoft.com/en-us/uwp/api/Windows.Media.Capture.MediaCapture
MediaCapture = new ExampleMediaCapture();
await MediaCapture.InitializeAsync();
FrameCollection = new ExampleMediaFrameCollection(MediaCapture);
FrameCollection.CollectionProgressed += FrameCollection_CollectionProgressed;
CaptureElement.Source = MediaCapture.PreviewMediaCapture;
CaptureElement.FlowDirection = MediaCapture.PreviewFlowDirection;
await MediaCapture.StartPreviewAsync();
// Open the reader object to subscribe to arriving frames
// More information:
// https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/process-media-frames-with-mediaframereader#create-a-frame-reader-for-the-frame-source
// ExampleMediaFrameReader interface is based on Windows.Media.Capture.Frames.MultiSourceMediaFrameReader
// https://docs.microsoft.com/en-us/uwp/api/windows.media.capture.frames.multisourcemediaframereader
FrameReader = await MediaCapture.CreateFrameReaderAsync();
FrameReader.AcquisitionMode = MediaFrameReaderAcquisitionMode.Buffered;
FrameReader.FrameArrived += FrameReader_FrameArrived;
// Start frame reader immediately
await FrameReader.StartAsync();
DispatcherTimer = new DispatcherTimer
{
Interval = TimeSpan.FromMilliseconds(100)
};
DispatcherTimer.Tick += DispatcherTimer_Tick;
DispatcherTimer.Start();
Stopwatch.Start();
}
private async void MediaCapture_FaceDetected(ExampleMediaCapture sender, FaceDetectedEventArgs args)
{
// This event is raised even when no faces are present, the argument must be inspected
if (args.ResultFrame.DetectedFaces.Any() && FrameReader != null)
{
if (PreviewOpacity == 0.0)
{
await FrameReader.StartAsync();
PreviewOpacity = 1.0;
}
// Reset the countdown to turning off camera
FrameReaderStopTrigger.Stop();
FrameReaderStopTrigger.Start();
}
UpdateSystemRelativeTime(args.ResultFrame.SystemRelativeTime);
}
private async Task StartOperationAsync()
{
ColorFrameEpochs = new ConcurrentQueue <TimeSpan>();
IlluminatedInfraredFrameEpochs = new ConcurrentQueue <TimeSpan>();
NonIlluminatedInfraredFrameEpochs = new ConcurrentQueue <TimeSpan>();
// Open the capture object to pump the frames to UI preview element
// More information, including how to keep the display on:
// https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/simple-camera-preview-access
// ExampleMediaCapture interface is based on Windows.Media.Capture.MediaCapture
// https://docs.microsoft.com/en-us/uwp/api/Windows.Media.Capture.MediaCapture
MediaCapture = new ExampleMediaCapture();
await MediaCapture.InitializeAsync(new ExampleMediaCaptureInitializationSettings
{
FaceDetectionAffinity = ExampleMediaCaptureFaceDetectionAffinity.MediaCapturePreview,
});
FrameCollection = new ExampleMediaFrameCollection(MediaCapture);
FrameCollection.CollectionProgressed += FrameCollection_CollectionProgressed;
CaptureElement.Source = MediaCapture.PreviewMediaCapture;
CaptureElement.FlowDirection = MediaCapture.PreviewFlowDirection;
await MediaCapture.StartPreviewAsync();
// Open the reader object to subscribe to arriving frames
// More information:
// https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/process-media-frames-with-mediaframereader#create-a-frame-reader-for-the-frame-source
// ExampleMediaFrameReader interface is based on Windows.Media.Capture.Frames.MultiSourceMediaFrameReader
// https://docs.microsoft.com/en-us/uwp/api/windows.media.capture.frames.multisourcemediaframereader
FrameReader = await MediaCapture.CreateFrameReaderAsync();
FrameReader.AcquisitionMode = MediaFrameReaderAcquisitionMode.Buffered;
FrameReader.FrameArrived += FrameReader_FrameArrived;
// Subscribe to face detection events
// More information:
// https://docs.microsoft.com/en-us/windows/uwp/audio-video-camera/scene-analysis-for-media-capture#face-detection-effect
// ExampleMediaCapture.FaceDetected interface is based on Windows.Media.Core.FaceDetectionEffect.FaceDetected
// https://docs.microsoft.com/en-us/uwp/api/windows.media.core.facedetectioneffect.facedetected
if (UseFaceDetection)
{
MediaCapture.FaceDetected += MediaCapture_FaceDetected;
}
DispatcherTimer = new DispatcherTimer
{
Interval = TimeSpan.FromMilliseconds(100)
};
DispatcherTimer.Tick += DispatcherTimer_Tick;
DispatcherTimer.Start();
FrameReaderStopTrigger = new Timer
{
AutoReset = false,
Interval = TimeSpan.FromSeconds(3).TotalMilliseconds,
};
FrameReaderStopTrigger.Elapsed += FrameReaderStopTrigger_Elapsed;
if (!UseFaceDetection)
{
PreviewOpacity = 1.0;
}
}
public ExampleMediaFrameCollection(ExampleMediaCapture ExampleMediaCapture)
{
Frames = new ConcurrentQueue <ExampleMediaFrame>();
ExampleMediaCapture.FaceDetected += ExampleMediaCapture_FaceDetected;
DelayedProcessingTrigger = new Timer(TriggerProcessing, null, TimeSpan.Zero, TimeSpan.FromSeconds(1));
}
