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recorder in the WEB does not work

See original GitHub issue

Audio recording in the WEB does not work. When trying to start the compiler, an error occurred. The recorder cannot start and record sound. For some reason, the browser does not ask for permission to record audio.

import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_sound/flutter_sound.dart';

class MicInterface extends StatefulWidget {
  @override
  _MicInterfaceState createState() => _MicInterfaceState();
}

class _MicInterfaceState extends State<MicInterface> {
  FlutterSoundRecorder _myRecorder = FlutterSoundRecorder();
  StreamController<Food> recordingDataController = StreamController<Food>();

  @override
  void initState() {
    super.initState();
    _openRecorder();
  }

  Future<void> _openRecorder() async {
    await _myRecorder.openAudioSession(
      focus: AudioFocus.requestFocusAndDuckOthers,
      category: SessionCategory.record,
    );
  }

  @override
  void dispose() {
    // Be careful : you must `close` the audio session when you have finished with it.
    _myRecorder.closeAudioSession();
    _myRecorder = null;
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Row(mainAxisAlignment: MainAxisAlignment.center, children: [
      FloatingActionButton(
          child: Icon(Icons.mic),
          onPressed: () async {
            await _myRecorder.startRecorder(
              toStream: recordingDataController.sink,
              codec: Codec.pcm16,
              numChannels: 1,
              sampleRate: 48000,
            );
          }),
      Container(width: 20),
      FloatingActionButton(
          child: Icon(Icons.stop),
          onPressed: () async {
            await _myRecorder.stopRecorder();
          }),
    ]);
  }
}