private async Task Capture()
{
if (_waiting)
{
return;
}
Stream imageStream = await _camera.CaptureImageAsync();
if (imageStream == null)
{
Log("Capture failed.");
return;
}
MemoryStream bitmapStream = new MemoryStream();
imageStream.CopyTo(bitmapStream);
SoftwareBitmap image = await _camera.ConvertStreamToBitmap(bitmapStream);
SoftwareBitmap convertedImage = SoftwareBitmap.Convert(image, BitmapPixelFormat.Nv12);
if (!FaceDetector.IsBitmapPixelFormatSupported(convertedImage.BitmapPixelFormat))
{
Log($"Unsupported pixel format! ({convertedImage.BitmapPixelFormat})");
return;
}
await Dispatcher.RunAsync(Windows.UI.Core.CoreDispatcherPriority.Normal, async() => {
var imgSrc = new SoftwareBitmapSource();
await imgSrc.SetBitmapAsync(image);
imgCapture.Source = imgSrc;
});
var fd = await FaceDetector.CreateAsync();
var faces = await fd.DetectFacesAsync(convertedImage);
if (faces.Count == 0)
{
// no faces, nothing to do
Log("No faces detected.", false);
return;
}
Log($"{faces.Count} faces.", false);
_waiting = true; // block any other processing
if (_config.EnableUpload)
{
// face detected locally, send to Storage
imageStream.Seek(0, SeekOrigin.Begin);
string fileName = await StorageService.UploadImageAsync(imageStream);
Log($"Sent to processing.");
int serverFacesDetected;
while ((serverFacesDetected = await CheckService.FacesDetectedAsync(fileName)) == -1)
{
await Task.Delay(TimeSpan.FromSeconds(2));
}
if (serverFacesDetected > 0)
{
// something detected on server, activate delay
Log($"Faces found on server. Waiting {_vm.Delay} seconds.");
await Task.Delay(TimeSpan.FromSeconds(_vm.Delay));
}
else
{
Log("No faces found on server. Skipping delay.");
}
}
imageStream.Dispose();
bitmapStream.Dispose();
_waiting = false;
}
