/// <summary>
/// Initializes video preview and updates the <see cref="PreviewBrush"/> accordingly.
/// </summary>
/// <param name="previewFormatSelector">
/// Function that chooses the most suitable preview format from the provided collection.
/// </param>
/// <returns>Awaitable task.</returns>
/// <exception cref="ArgumentNullException"><paramref name="previewFormatSelector"/> is <see langword="null"/>.</exception>
/// <exception cref="InvalidOperationException">No suitable video preview formats found.</exception>
public async Task StartPreviewAsync(Func<IEnumerable<VideoEncodingProperties>, VideoEncodingProperties> previewFormatSelector)
{
if (previewFormatSelector == null)
{
throw new ArgumentNullException("previewFormatSelector");
}
Tracing.Trace("CameraController: Starting video preview.");
if (!string.IsNullOrEmpty(this.PreviewVideoPort))
{
Tracing.Trace("CameraController: Video preview is already started.");
return;
}
try
{
// Set the video preview format.
VideoEncodingProperties previewFormat = await this.DoSetMediaFormatAsync(MediaStreamType.VideoPreview, previewFormatSelector);
MediaCapturePreviewSink previewSink = new MediaCapturePreviewSink();
VideoBrush videoBrush = new VideoBrush();
videoBrush.SetSource(previewSink);
MediaEncodingProfile profile = new MediaEncodingProfile { Audio = null, Video = previewFormat };
await this.MediaCapture.StartPreviewToCustomSinkAsync(profile, previewSink);
this.PreviewFormat = previewFormat;
this.PreviewResolution = new Size(previewFormat.Width, previewFormat.Height);
this.PreviewBrush = videoBrush;
this.PreviewVideoPort = previewSink.ConnectionPort;
////
//// Update camera properties.
////
this.Rotation = this.MediaCapture.GetPreviewRotation();
this.FocusSupported = this.MediaCapture.VideoDeviceController.FocusControl.Supported;
this.FocusAtPointSupported = this.MediaCapture.VideoDeviceController.RegionsOfInterestControl.AutoFocusSupported && this.MediaCapture.VideoDeviceController.RegionsOfInterestControl.MaxRegions > 0;
this.ContinuousAutoFocusSupported = this.MediaCapture.VideoDeviceController.FocusControl.SupportedFocusModes.Contains(FocusMode.Continuous);
this.FlashSupported = this.MediaCapture.VideoDeviceController.FlashControl.Supported;
if (this.FocusSupported)
{
this.ConfigureAutoFocus(continuous: false);
if (this.MediaCapture.VideoDeviceController.FocusControl.FocusChangedSupported)
{
this.MediaCapture.FocusChanged += this.MediaCaptureFocusChanged;
}
}
this.NotifyPropertiesChanged();
}
catch (Exception e)
{
Tracing.Trace("CameraController: StartPreviewAsync: 0x{0:X8}\r\n{1}", e.HResult, e);
throw;
}
Tracing.Trace("CameraController: Video preview started.");
}
/// <summary>
/// Initializes video preview and updates the <see cref="PreviewBrush"/> accordingly.
/// </summary>
/// <param name="previewFormatSelector">
/// Function that chooses the most suitable preview format from the provided collection.
/// </param>
/// <returns>Awaitable task.</returns>
/// <exception cref="ArgumentNullException"><paramref name="previewFormatSelector"/> is <see langword="null"/>.</exception>
/// <exception cref="InvalidOperationException">No suitable video preview formats found.</exception>
public async Task StartPreviewAsync(Func <IEnumerable <VideoEncodingProperties>, VideoEncodingProperties> previewFormatSelector)
{
if (previewFormatSelector == null)
{
throw new ArgumentNullException("previewFormatSelector");
}
Tracing.Trace("CameraController: Starting video preview.");
if (!string.IsNullOrEmpty(this.PreviewVideoPort))
{
Tracing.Trace("CameraController: Video preview is already started.");
return;
}
try
{
// Set the video preview format.
VideoEncodingProperties previewFormat = await this.DoSetMediaFormatAsync(MediaStreamType.VideoPreview, previewFormatSelector);
MediaCapturePreviewSink previewSink = new MediaCapturePreviewSink();
VideoBrush videoBrush = new VideoBrush();
videoBrush.SetSource(previewSink);
MediaEncodingProfile profile = new MediaEncodingProfile {
Audio = null, Video = previewFormat
};
await this.MediaCapture.StartPreviewToCustomSinkAsync(profile, previewSink);
this.PreviewFormat = previewFormat;
this.PreviewResolution = new Size(previewFormat.Width, previewFormat.Height);
this.PreviewBrush = videoBrush;
this.PreviewVideoPort = previewSink.ConnectionPort;
////
//// Update camera properties.
////
this.Rotation = this.MediaCapture.GetPreviewRotation();
this.FocusSupported = this.MediaCapture.VideoDeviceController.FocusControl.Supported;
this.FocusAtPointSupported = this.MediaCapture.VideoDeviceController.RegionsOfInterestControl.AutoFocusSupported && this.MediaCapture.VideoDeviceController.RegionsOfInterestControl.MaxRegions > 0;
this.ContinuousAutoFocusSupported = this.MediaCapture.VideoDeviceController.FocusControl.SupportedFocusModes.Contains(FocusMode.Continuous);
this.FlashSupported = this.MediaCapture.VideoDeviceController.FlashControl.Supported;
if (this.FocusSupported)
{
this.ConfigureAutoFocus(continuous: false);
if (this.MediaCapture.VideoDeviceController.FocusControl.FocusChangedSupported)
{
this.MediaCapture.FocusChanged += this.MediaCaptureFocusChanged;
}
}
this.NotifyPropertiesChanged();
}
catch (Exception e)
{
Tracing.Trace("CameraController: StartPreviewAsync: 0x{0:X8}\r\n{1}", e.HResult, e);
throw;
}
Tracing.Trace("CameraController: Video preview started.");
}
