/// <summary>
/// Enumerate video preview formats and select the one
/// whose dimensions are nearest to the input width/height.
/// </summary>
/// <returns>Selected format</returns>
public static async Task <VideoEncodingProperties> SelectNearestPreviewResolutionAsync(this VideoDeviceController controller, double width, double height)
{
var formats = controller.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview);
var format = (VideoEncodingProperties)formats.OrderBy((item) =>
{
var props = (VideoEncodingProperties)item;
return(Math.Abs(props.Width - width) + Math.Abs(props.Height - height));
}).First();
await controller.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, format);
return(format);
}
public async Task <bool> InitializeAsync()
{
if (Initialized)
{
// Already intialized
return(true);
}
_deviceInformationCollection = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
// Find the back camera
_deviceInformation =
(from camera in _deviceInformationCollection
where camera.EnclosureLocation != null &&
camera.EnclosureLocation.Panel == Windows.Devices.Enumeration.Panel.Back
select camera).FirstOrDefault();
if (_deviceInformation == null && _deviceInformationCollection.Count != 0)
{
// Fallback to whatever is available (e.g. webcam on laptop)
_deviceInformation = _deviceInformationCollection[0];
}
if (_deviceInformation == null)
{
throw new Exception("No camera device found");
}
MediaCapture = new MediaCapture();
MediaCaptureInitializationSettings settings = new MediaCaptureInitializationSettings();
settings.StreamingCaptureMode = StreamingCaptureMode.Video;
settings.VideoDeviceId = _deviceInformation.Id;
await MediaCapture.InitializeAsync(settings);
#if WINDOWS_PHONE_APP
_lightSensor.ReportInterval = _lightSensor.MinimumReportInterval;
_lightSensor.ReadingChanged += OnLightSensorReadingChangedAsync;
#endif
_videoDeviceController = MediaCapture.VideoDeviceController;
IList <VideoEncodingProperties> listOfPropertiesWithHighestFrameRate =
CameraUtils.ResolveAllVideoEncodingPropertiesWithHighestFrameRate(_videoDeviceController, RecordMediaStreamType);
if (listOfPropertiesWithHighestFrameRate != null && listOfPropertiesWithHighestFrameRate.Count > 0)
{
VideoEncodingProperties selectedRecordingVideoEncodingProperties = listOfPropertiesWithHighestFrameRate.ElementAt(0);
uint selectedRecordingVideoWidth = selectedRecordingVideoEncodingProperties.Width;
for (int i = 1; i < listOfPropertiesWithHighestFrameRate.Count; ++i)
{
VideoEncodingProperties currentProperties = listOfPropertiesWithHighestFrameRate.ElementAt(i);
if (selectedRecordingVideoWidth > MaximumVideoWidth ||
(currentProperties.Width <= MaximumVideoWidth && currentProperties.Width > selectedRecordingVideoWidth))
{
selectedRecordingVideoEncodingProperties = currentProperties;
selectedRecordingVideoWidth = selectedRecordingVideoEncodingProperties.Width;
}
}
_hfrVideoEncodingProperties = selectedRecordingVideoEncodingProperties;
await _videoDeviceController.SetMediaStreamPropertiesAsync(RecordMediaStreamType, selectedRecordingVideoEncodingProperties);
VideoEncodingProperties previewVideoEncodingProperties =
CameraUtils.FindVideoEncodingProperties(
_videoDeviceController, PreviewMediaStreamType,
PreviewFrameRate, selectedRecordingVideoWidth, selectedRecordingVideoEncodingProperties.Height);
System.Diagnostics.Debug.WriteLine("Highest framerate for recording is "
+ CameraUtils.ResolveFrameRate(selectedRecordingVideoEncodingProperties)
+ " frames per second with selected resolution of "
+ selectedRecordingVideoWidth + "x" + selectedRecordingVideoEncodingProperties.Height
+ "\nThe preview properties for viewfinder are "
+ CameraUtils.ResolveFrameRate(previewVideoEncodingProperties) + " FPS and "
+ previewVideoEncodingProperties.Width + "x" + previewVideoEncodingProperties.Height);
await _videoDeviceController.SetMediaStreamPropertiesAsync(PreviewMediaStreamType, previewVideoEncodingProperties);
}
if (_videoDeviceController.WhiteBalanceControl.Supported)
{
await _videoDeviceController.WhiteBalanceControl.SetPresetAsync(ColorTemperaturePreset.Fluorescent);
}
Initialized = true;
return(Initialized);
}