public void Dispose()
{
_speechRecognizer?.Dispose();
_audioEngine?.Dispose();
_recognitionRequest?.Dispose();
_recognitionTask?.Dispose();
_initialSilenceTimeout?.Dispose();
_endSilenceTimeout?.Dispose();
}
public void Start()
{
recognitionTask?.Cancel();
recognitionTask = null;
recognizedText = "";
var audioSession = AVAudioSession.SharedInstance();
NSError err;
err = audioSession.SetCategory(AVAudioSessionCategory.Record);
audioSession.SetMode(AVAudioSession.ModeMeasurement, out err);
err = audioSession.SetActive(true, AVAudioSessionSetActiveOptions.NotifyOthersOnDeactivation);
liveRequest = new SFSpeechAudioBufferRecognitionRequest {
ShouldReportPartialResults = true
};
var node = audioEngine.InputNode;
var recordingFormat = node.GetBusOutputFormat(0);
node.InstallTapOnBus(0, 1024, recordingFormat, (AVAudioPcmBuffer buffer, AVAudioTime when) => {
// Append buffer to recognition request
liveRequest.Append(buffer);
});
recognitionTask = speechRecognizer.GetRecognitionTask(liveRequest, (SFSpeechRecognitionResult result, NSError error) => {
var isFinal = false;
if (result != null)
{
recognizedText = result.BestTranscription.FormattedString;
OnSpeechRecognized(new SpeechRecognizedEvent(recognizedText));
isFinal = result.Final;
}
if (error != null || isFinal)
{
audioSession.SetCategory(AVAudioSessionCategory.Playback);
audioSession.SetMode(AVAudioSession.ModeDefault, out err);
node.RemoveTapOnBus(0);
audioEngine.Dispose();
liveRequest.Dispose();
recognitionTask.Dispose();
liveRequest = null;
recognitionTask = null;
}
});
audioEngine.Prepare();
audioEngine.StartAndReturnError(out err);
}
public void stop()
{
if (!running)
{
return;
}
running = false;
AVAudioSession.SharedInstance().SetActive(false);
if (audioPlayer != null)
{
try
{
audioPlayer.Stop();
audioPlayer.Reset();
}
catch (Exception)
{
}
audioPlayer.Dispose();
audioPlayer = null;
}
if (audioDecoder != null)
{
audioDecoder.stop();
audioDecoder.Dispose();
audioDecoder = null;
}
if (audioEngine != null)
{
try
{
audioEngine.Stop();
audioEngine.Reset();
}
catch (Exception)
{
}
audioEngine.Dispose();
audioEngine = null;
}
}
static void StopInstances()
{
AudioEngine?.InputNode?.RemoveTapOnBus(0);
AudioEngine?.Stop();
AudioEngine?.Dispose();
AudioEngine = null;
LiveSpeechRequest?.EndAudio();
LiveSpeechRequest?.Dispose();
LiveSpeechRequest = null;
SpeechRecognizer?.Dispose();
SpeechRecognizer = null;
//Timer?.Dispose();
//Timer = null;
}
public void stop()
{
if (!running)
{
return;
}
running = false;
AVAudioSession.SharedInstance().SetActive(false);
if (audioRecorder != null)
{
try
{
audioRecorder.InputNode.RemoveTapOnBus(0);
audioRecorder.Stop();
audioRecorder.Reset();
}
catch (Exception)
{
}
audioRecorder.Dispose();
audioRecorder = null;
}
if (audioEncoder != null)
{
audioEncoder.stop();
audioEncoder.Dispose();
audioEncoder = null;
}
lock (outputBuffers)
{
outputBuffers.Clear();
}
}
void DeletePlayer()
{
Stop();
if (player != null && player.Playing)
{
player.Stop();
}
if (engine != null && engine.Running)
{
engine.Stop();
}
if (player != null && engine != null && pitch != null)
{
engine.Dispose();
player.Dispose();
pitch.Dispose();
engine = null;
player = null;
pitch = null;
}
}