FLUTTER：我想录制麦克风流并立即播放答案

【问题标题】：FLUTTER: I want to record the stream of microphone and play it immediatelyFLUTTER：我想录制麦克风流并立即播放
【发布时间】：2019-04-17 11:12:21
【问题描述】：

我想做和应用程序谁获取麦克风流并直接在 Flutter 中播放它，谁可以帮助我，我在互联网上找不到任何东西。谢谢！

【问题讨论】：

标签： audio dart flutter microphone

【解决方案1】：

经过一些更改后，它的工作方式是这样的，请使用这个插件： https://pub.dev/packages/sound_stream

将此导入您的 pubspec：

dependencies:
  sound_stream: ^0.2.0

并使用此示例代码：

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

import 'package:sound_stream/sound_stream.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  RecorderStream _recorder = RecorderStream();
  PlayerStream _player = PlayerStream();

  List<Uint8List> _micChunks = [];
  bool _isRecording = false;
  bool _isPlaying = false;

  StreamSubscription _recorderStatus;
  StreamSubscription _playerStatus;
  StreamSubscription _audioStream;

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

  @override
  void dispose() {
    _recorderStatus?.cancel();
    _playerStatus?.cancel();
    _audioStream?.cancel();
    super.dispose();
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlugin() async {
    _recorderStatus = _recorder.status.listen((status) {
      if (mounted)
        setState(() {
          _isRecording = status == SoundStreamStatus.Playing;
        });
    });

    _audioStream = _recorder.audioStream.listen((data) {
      if (_isPlaying) {
        _player.writeChunk(data);
      } else {
        _micChunks.add(data);
      }
    });

    _playerStatus = _player.status.listen((status) {
      if (mounted)
        setState(() {
          _isPlaying = status == SoundStreamStatus.Playing;
        });
    });

    await Future.wait([
      _recorder.initialize(),
      _player.initialize(),
    ]);
  }

  void _play() async {
    await _player.start();

    if (_micChunks.isNotEmpty) {
      for (var chunk in _micChunks) {
        await _player.writeChunk(chunk);
      }
      _micChunks.clear();
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Row(
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: [
            IconButton(
              iconSize: 96.0,
              icon: Icon(_isRecording ? Icons.mic_off : Icons.mic),
              onPressed: _isRecording ? _recorder.stop : _recorder.start,
            ),
            IconButton(
              iconSize: 96.0,
              icon: Icon(_isPlaying ? Icons.pause : Icons.play_arrow),
              onPressed: _isPlaying ? _player.stop : _play,
            ),
          ],
        ),
      ),
    );
  }
}

【讨论】：

对于 iOS 有这个错误：Xcode's output: ld: warning: Could not find or use auto-linked library 'swiftDispatch' ld: warning: Could not find or use auto-linked library 'swiftCoreMedia' ld: warning: Could not find or use auto-linked library 'swiftAVFoundation' ld: warning: Could not find or use auto-linked library 'swiftFoundation' ld: warning: Could not find or use auto-linked library 'swiftsimd' ld: warning: Could not find or use auto-linked library 'swiftCompatibility51' 等。知道为什么吗？

【解决方案2】：

flutter_sound(github 和 docs) 库似乎有很好的工具来处理音频和流。

甚至还有一个example page for streams，它准确地显示了如何录制到流和回放。您只需将依赖项添加到您的pubspec.yaml 并为平台权限文件添加必要的权限，然后链接的示例将独立作为一个页面，同时具有记录器和播放器来演示功能。

【讨论】：

【解决方案3】：

您可以使用this 库从麦克风录制音频。

用法要使用此插件，请在 pubspec.yaml 文件中添加 audio_recorder 作为依赖项。

安卓

<uses-permission android:name="android.permission.RECORD_AUDIO" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

iOS

<key>NSMicrophoneUsageDescription</key>
<string>Record audio for playback</string>

示例

// Import package
import 'package:audio_recorder/audio_recorder.dart';

// Check permissions before starting
bool hasPermissions = await AudioRecorder.hasPermissions;

// Get the state of the recorder
bool isRecording = await AudioRecorder.isRecording;

// Start recording
await AudioRecorder.start(path: _controller.text, audioOutputFormat: AudioOutputFormat.AAC);

// Stop recording
Recording recording = await AudioRecorder.stop();
print("Path : ${recording.path},  Format : ${recording.audioOutputFormat},  Duration : ${recording.duration},  Extension : ${recording.extension},");

现在您需要做的就是播放录制的声音文件。

【讨论】：