是否可以用颤振记录音频输出？

Question

我想用颤振构建一个录音机，但我似乎找不到任何方法来记录从设备播放的音频而不是麦克风本身。有什么办法可以做到吗？

Answer 1

https://pub.dev/packages/flutter_audio_recorder

https://pub.dev/packages/audioplayers

这两个包对于在flutter中实现音频重新编码和播放很有用。

这里有一些代码参考-

  bool isRecordingStarted = false;
  bool isPlaying = false;
  FlutterAudioRecorder _recorder;
  Recording _recording;
  Timer _t;
  var recordedAudio;
  RecordingStatus _currentStatus = RecordingStatus.Unset;
  IconData _recordIcon = Icons.mic_none;
  Duration _duration;
  Duration _position;

  Future _startRecording() async {
    await _recorder.start();
    var current = await _recorder.current();
    setState(() {
      _recording = current;
    });

    _t = Timer.periodic(Duration(milliseconds: 10), (Timer t) async {
      var current = await _recorder.current();
      setState(() {
        _recording = current;
        _t = t;
      });
    });
  }

  Future _stopRecording() async {
    var result = await _recorder.stop();
    _t.cancel();

    setState(() {
      // _recording = result;
      _recording = new Recording();
    });
    print("_recording.path : ${result.path}");
    setState(() {
      recordedAudio = result.path;
    });
    // Navigator.pushNamed(context, Screen.AudioPostingView.toString(),
    //     arguments: {"audioUrl": result.path});
  }

///用于音频播放

 playLocal() async {
    int result = await advancedPlayer.play(recordedAudio, isLocal: true);
    // setState(() => playerState = PlayerState.playing);
  }

  @override
  void initState() {
    // getLastPost();
    _init();
    _loadRiveFile();
    _prepare();
    _getDuration();
    // startTimer();

    advancedPlayer.onDurationChanged
        .listen((d) => setState(() => _duration = d));
    // _initAudioPlayer();
    super.initState();
  }