// Processes a MediaFrameReference and displays it in a XAML image control
public void ProcessFrame(MediaFrameReference frame)
{
var softwareBitmap = FrameRenderer.ConvertToDisplayableImage(frame?.VideoMediaFrame);
if (softwareBitmap != null)
{
// Swap the processed frame to _backBuffer and trigger UI thread to render it
softwareBitmap = Interlocked.Exchange(ref _backBuffer, softwareBitmap);
// UI thread always reset _backBuffer before using it. Unused bitmap should be disposed.
softwareBitmap?.Dispose();
// Changes to xaml ImageElement must happen in UI thread through Dispatcher
var task = _imageElement.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
async() =>
{
// Don't let two copies of this task run at the same time.
if (_taskRunning)
{
return;
}
_taskRunning = true;
// Keep draining frames from the backbuffer until the backbuffer is empty.
SoftwareBitmap latestBitmap;
while ((latestBitmap = Interlocked.Exchange(ref _backBuffer, null)) != null)
{
var imageSource = (SoftwareBitmapSource)_imageElement.Source;
await imageSource.SetBitmapAsync(latestBitmap);
latestBitmap.Dispose();
}
_taskRunning = false;
});
}
}
private async void Page_Loaded(object sender, RoutedEventArgs e)
{
var frameSourceGroups = await MediaFrameSourceGroup.FindAllAsync();
var selectedGroupObjectsList = frameSourceGroups.Select(group =>
new
{
sourceGroup = group,
colorSourceInfo = group.SourceInfos.FirstOrDefault((sourceInfo) =>
{
// On XBox/Kinect, omit the MediaStreamType and EnclosureLocation tests
return(sourceInfo.SourceKind == MediaFrameSourceKind.Color);
})
}).Where(t => t.colorSourceInfo != null)
.ToList();
var selectedGroupObjects = selectedGroupObjectsList.FirstOrDefault();
MediaFrameSourceGroup selectedGroup = selectedGroupObjects?.sourceGroup;
MediaFrameSourceInfo colorSourceInfo = selectedGroupObjects?.colorSourceInfo;
if (selectedGroup == null)
{
return;
}
var mediaCapture = new MediaCapture();
var settings = new MediaCaptureInitializationSettings()
{
SourceGroup = selectedGroup,
SharingMode = MediaCaptureSharingMode.ExclusiveControl,
MemoryPreference = MediaCaptureMemoryPreference.Cpu,
StreamingCaptureMode = StreamingCaptureMode.Video
};
try
{
await mediaCapture.InitializeAsync(settings);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("MediaCapture initialization failed: " + ex.Message);
return;
}
var colorFrameSource = mediaCapture.FrameSources[colorSourceInfo.Id];
BitmapSize size = new BitmapSize() // Choose a lower resolution to make the image processing more performant
{
Height = 480,
Width = 640
};
var mediaFrameReader = await mediaCapture.CreateFrameReaderAsync(colorFrameSource, MediaEncodingSubtypes.Argb32, size);
mediaFrameReader.FrameArrived += MediaFrameReader_FrameArrived;
imageElement.Source = new SoftwareBitmapSource();
_frameRenderer = new FrameRenderer(imageElement);
await mediaFrameReader.StartAsync();
}