public async Task DescribeImageAsync()
{
IsBusy = true;
StatusMessage = null;
string visionDescription = null;
string facesRecognizedDescription = null;
string facesDescription = null;
MessengerInstance.Send(new NotificationMessage(Constants.TakingPhoto));
try
{
StatusMessage = AppResources.QueryingVisionService;
using (var stream = await streamingService.GetCurrentFrameAsync())
{
if (stream != null)
{
var imageBytes = await stream.ToArrayAsync();
MessengerInstance.Send(new NotificationMessage <byte[]>(imageBytes, Constants.PhotoTaken));
if (await NetworkService.IsInternetAvailableAsync())
{
var result = await cognitiveClient.AnalyzeAsync(stream, Language, RecognitionType.Vision | RecognitionType.Face | RecognitionType.Emotion, OnRecognitionProgress);
var visionResult = result.VisionResult;
var faceResults = result.FaceResults;
if (!faceResults.Any() || Settings.ShowDescriptionOnFaceIdentification)
{
// Gets the description only if no faces has been recognized or if the corresponding setting flag is set.
if (visionResult.IsValid)
{
visionDescription = visionResult.Description;
if (visionResult.IsTranslated)
{
if (Settings.ShowOriginalDescriptionOnTranslation)
{
visionDescription = $"{visionResult.TranslatedDescription} ({visionResult.Description})";
}
else
{
visionDescription = visionResult.TranslatedDescription;
}
}
if (Settings.ShowDescriptionConfidence)
{
visionDescription = $"{visionDescription} ({Math.Round(visionResult.Confidence, 2)})";
}
}
else
{
if (Settings.ShowRawDescriptionOnInvalidRecognition && visionResult.RawDescription != null)
{
visionDescription = $"{AppResources.RecognitionFailed} ({visionResult.RawDescription}, {Math.Round(visionResult.Confidence, 2)})";
}
else
{
visionDescription = AppResources.RecognitionFailed;
}
}
visionDescription = $"{visionDescription}{Constants.SentenceEnd}";
}
if (faceResults.Any())
{
// At least a face has been recognized.
var faceMessages = new StringBuilder();
foreach (var faceResult in faceResults)
{
var faceMessage = SpeechHelper.GetFaceMessage(faceResult);
faceMessages.Append(faceMessage);
}
// Describes how many faces have been recognized.
if (faceResults.Count() == 1)
{
facesRecognizedDescription = AppResources.FaceRecognizedSingular;
}
else
{
facesRecognizedDescription = $"{string.Format(AppResources.FacesRecognizedPlural, faceResults.Count())} {Constants.SentenceEnd}";
}
facesDescription = faceMessages.ToString();
}
}
else
{
// Connection isn't available, the service cannot be reached.
visionDescription = AppResources.NoConnection;
}
}
else
{
visionDescription = AppResources.UnableToTakePhoto;
}
}
}
catch (CognitiveException ex)
{
// Unable to access the service (message contains translated error details).
visionDescription = ex.Message;
}
catch (WebException)
{
// Internet isn't available, the service cannot be reached.
visionDescription = AppResources.NoConnection;
}
catch (Exception ex)
{
var error = AppResources.RecognitionError;
if (Settings.ShowExceptionOnError)
{
error = $"{error} ({ex.Message})";
}
visionDescription = error;
}
// Shows and speaks the result.
var message = $"{visionDescription} {facesRecognizedDescription} {facesDescription}";
StatusMessage = this.GetNormalizedMessage(message);
await SpeechHelper.TrySpeechAsync(message);
IsBusy = false;
}