private void StartRecordingAndRecognizing()
{
try
{
_timer = NSTimer.CreateRepeatingScheduledTimer(5, delegate
{
DidFinishTalk();
});
// Cancel the previous task if it's running.
_recognitionTask?.Cancel();
_recognitionTask = null;
var audioSession = AVAudioSession.SharedInstance();
var nsError = audioSession.SetCategory(AVAudioSessionCategory.PlayAndRecord);
audioSession.SetMode(AVAudioSession.ModeDefault, out nsError);
nsError = audioSession.SetActive(true, AVAudioSessionSetActiveOptions.NotifyOthersOnDeactivation);
audioSession.OverrideOutputAudioPort(AVAudioSessionPortOverride.Speaker, out nsError);
// Configure request so that results are returned before audio recording is finished
_recognitionRequest = new SFSpeechAudioBufferRecognitionRequest();
var inputNode = _audioEngine.InputNode;
if (inputNode == null)
{
throw new InvalidProgramException("Audio engine has no input node");
}
var recordingFormat = inputNode.GetBusOutputFormat(0);
inputNode.InstallTapOnBus(0, 1024, recordingFormat, (buffer, when) =>
{
_recognitionRequest?.Append(buffer);
});
_audioEngine.Prepare();
_audioEngine.StartAndReturnError(out nsError);
// A recognition task represents a speech recognition session.
// We keep a reference to the task so that it can be cancelled.
_recognitionTask = _speechRecognizer.GetRecognitionTask(_recognitionRequest, (result, error) =>
{
if (result != null)
{
var eventArg = new TextReceivedEventArg
{
Text = result.BestTranscription.FormattedString
};
OnTextReceived(eventArg);
_timer.Invalidate();
_timer = null;
_timer = NSTimer.CreateRepeatingScheduledTimer(2, delegate
{
DidFinishTalk();
});
}
if (error == null)
{
return;
}
OnStoppedListening();
StopRecordingAndRecognition();
});
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
}
/// <inheritdoc />
public void OnTextReceived(TextReceivedEventArg e)
{
TextReceived?.Invoke(e);
}
private void Current_TextReceived(TextReceivedEventArg e)
{
RecordLabel.Text = e.Text;
}