Record to stream not working in iOS

[wernerpaulin]

I need Help for :
flutter_sound/example/lib/recordToStream/record_to_stream_example.dart
Although permissions are correctly set, the stream initialized and the recorder started no data is sent to the stream sink?
On Android this works without any issues?

Here is my question :
Is there anything which I missing out here? Thank you!

Here is the code snippet. It includes some debugging code like using "_curShortTimeEnergy" for debugging and try/catch.

void _startRecording() async {
    // Check if we got permission to record
    if (_microphonePermissionStatus == PermissionStatus.denied || _microphonePermissionStatus == PermissionStatus.permanentlyDenied) {
      return;
    }
    
    if (!_recorder.isRecording) {
      _audioStreamController = StreamController<Uint8List>();

      if (_audioStreamController == null) {
        return;
      }

      _recordingDataSubscription = _audioStreamController!.stream.listen((rawByteBuffer) {
        //cyclic signal processing when ever a chunk of audio is received
        signalProcessing(rawByteBuffer);
      }, onDone: () {
        _curShortTimeEnergy = 500;
      }, onError: (error) {
        _curShortTimeEnergy = 501;
      });

      try {
        await _recorder.startRecorder(
          toStream: _audioStreamController!.sink,
          codec: Codec.pcm16, 
          sampleRate: _sampleRate,
          numChannels: 1,
          bitRate: 16,
          bufferSize: 8192,
        );
      }
      catch (e) {
        _curShortTimeEnergy = 404;
        return;
      } 

    }
  }