private CameraPreview DispatchOpenWithPreviewAsync(Size previewRequestSize)
{
_session.BeginConfiguration();
var videoOutput = new AVCaptureVideoDataOutput();
var settings = new AVVideoSettingsUncompressed {
PixelFormatType = CVPixelFormatType.CV32BGRA
};
videoOutput.UncompressedVideoSetting = settings;
videoOutput.WeakVideoSettings = settings.Dictionary;
videoOutput.AlwaysDiscardsLateVideoFrames = true;
var preview = new CameraPreview(previewRequestSize, new System.Drawing.Size(720, 1280));
videoOutput.SetSampleBufferDelegateQueue(preview, new DispatchQueue("sample buffer"));
_session.AddOutput(videoOutput);
var videoConnection = videoOutput.ConnectionFromMediaType(AVMediaType.Video);
videoConnection.VideoOrientation = AVCaptureVideoOrientation.Portrait;
videoConnection.VideoMirrored = true;
_photoOutput = new AVCapturePhotoOutput
{
IsHighResolutionCaptureEnabled = true
};
_photoOutput.SetPreparedPhotoSettingsAsync(new[] { CreatePhotoSettings() });
_session.SessionPreset = AVCaptureSession.Preset1280x720;
_session.AddOutput(_photoOutput);
_session.CommitConfiguration();
_session.StartRunning();
_isRunning = true;
return(preview);
}