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| # Additional information about this file can be found at | ||
| # https://dart.dev/guides/language/analysis-options | ||
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| include: package:flutter_lints/flutter.yaml | ||
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| analyzer: | ||
| exclude: [build/**] | ||
| language: | ||
| strict-casts: true | ||
| strict-inference: true | ||
| strict-raw-types: false | ||
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| linter: | ||
| rules: | ||
| cancel_subscriptions: true | ||
| constant_identifier_names: false | ||
| depend_on_referenced_packages: false | ||
| avoid_print: false |
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| # audio_streamer_example | ||
| # Audio Streamer Example | ||
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| Demonstrates how to use the audio_streamer plugin. | ||
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| ## Getting Started | ||
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| This project is a starting point for a Flutter application. | ||
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| A few resources to get you started if this is your first Flutter project: | ||
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| - [Lab: Write your first Flutter app](https://flutter.dev/docs/get-started/codelab) | ||
| - [Cookbook: Useful Flutter samples](https://flutter.dev/docs/cookbook) | ||
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| For help getting started with Flutter, view our | ||
| [online documentation](https://flutter.dev/docs), which offers tutorials, | ||
| samples, guidance on mobile development, and a full API reference. |
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| import 'dart:math'; | ||
| import 'dart:async'; | ||
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| import 'package:flutter/material.dart'; | ||
| import 'package:audio_streamer/audio_streamer.dart'; | ||
| import 'dart:math'; | ||
| import 'package:permission_handler/permission_handler.dart'; | ||
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| import 'package:flutter/services.dart'; | ||
| void main() => runApp(new AudioStreamingApp()); | ||
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| void main() { | ||
| runApp(new MyApp()); | ||
| } | ||
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| class MyApp extends StatefulWidget { | ||
| class AudioStreamingApp extends StatefulWidget { | ||
| @override | ||
| _MyAppState createState() => new _MyAppState(); | ||
| AudioStreamingAppState createState() => new AudioStreamingAppState(); | ||
| } | ||
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| class _MyAppState extends State<MyApp> { | ||
| // Note that AudioStreamer works as a singleton. | ||
| AudioStreamer streamer = AudioStreamer(); | ||
| class AudioStreamingAppState extends State<AudioStreamingApp> { | ||
| int? sampleRate; | ||
| bool isRecording = false; | ||
| List<double> audio = []; | ||
| List<double>? latestBuffer; | ||
| double? recordingTime; | ||
| StreamSubscription<List<double>>? audioSubscription; | ||
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| bool _isRecording = false; | ||
| List<double> _audio = []; | ||
| /// Check if microphone permission is granted. | ||
| Future<bool> checkPermission() async => await Permission.microphone.isGranted; | ||
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| @override | ||
| void initState() { | ||
| super.initState(); | ||
| } | ||
| /// Request the microphone permission. | ||
| Future<void> requestPermission() async => | ||
| await Permission.microphone.request(); | ||
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| /// Call-back on audio sample. | ||
| void onAudio(List<double> buffer) async { | ||
| _audio.addAll(buffer); | ||
| var sampleRate = await streamer.actualSampleRate; | ||
| double secondsRecorded = _audio.length.toDouble() / sampleRate; | ||
| print('Max amp: ${buffer.reduce(max)}'); | ||
| print('Min amp: ${buffer.reduce(min)}'); | ||
| print('$secondsRecorded seconds recorded.'); | ||
| print('-' * 50); | ||
| audio.addAll(buffer); | ||
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| // Get the actual sampling rate, if not already known. | ||
| sampleRate ??= await AudioStreamer().actualSampleRate; | ||
| recordingTime = audio.length / sampleRate!; | ||
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| setState(() => latestBuffer = buffer); | ||
| } | ||
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| void handleError(PlatformException error) { | ||
| setState(() { | ||
| _isRecording = false; | ||
| }); | ||
| print(error.message); | ||
| print(error.details); | ||
| /// Call-back on error. | ||
| void handleError(Object error) { | ||
| setState(() => isRecording = false); | ||
| print(error); | ||
| } | ||
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| /// Start audio sampling. | ||
| void start() async { | ||
| try { | ||
| // Start streaming using default sample rate of 44100 Hz | ||
| streamer.start(onAudio, handleError); | ||
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| setState(() { | ||
| _isRecording = true; | ||
| }); | ||
| } catch (error) { | ||
| print(error); | ||
| // Check permission to use the microphone. | ||
| // | ||
| // Remember to update the AndroidManifest file (Android) and the | ||
| // Info.plist and pod files (iOS). | ||
| if (!(await checkPermission())) { | ||
| await requestPermission(); | ||
| } | ||
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| // Set the sampling rate - works only on Android. | ||
| AudioStreamer().sampleRate = 22100; | ||
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| // Start listening to the audio stream. | ||
| audioSubscription = | ||
| AudioStreamer().audioStream.listen(onAudio, onError: handleError); | ||
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| setState(() => isRecording = true); | ||
| } | ||
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| /// Stop audio sampling. | ||
| void stop() async { | ||
| bool stopped = await streamer.stop(); | ||
| setState(() { | ||
| _isRecording = stopped; | ||
| }); | ||
| audioSubscription?.cancel(); | ||
| setState(() => isRecording = false); | ||
| } | ||
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| List<Widget> getContent() => <Widget>[ | ||
| Container( | ||
| margin: EdgeInsets.all(25), | ||
| child: Column(children: [ | ||
| Container( | ||
| child: Text(_isRecording ? "Mic: ON" : "Mic: OFF", | ||
| style: TextStyle(fontSize: 25, color: Colors.blue)), | ||
| margin: EdgeInsets.only(top: 20), | ||
| ) | ||
| ])), | ||
| ]; | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return MaterialApp( | ||
| home: Scaffold( | ||
| body: Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: getContent())), | ||
| floatingActionButton: FloatingActionButton( | ||
| backgroundColor: _isRecording ? Colors.red : Colors.green, | ||
| onPressed: _isRecording ? stop : start, | ||
| child: _isRecording ? Icon(Icons.stop) : Icon(Icons.mic)), | ||
| ), | ||
| ); | ||
| } | ||
| Widget build(BuildContext context) => MaterialApp( | ||
| home: Scaffold( | ||
| body: Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: <Widget>[ | ||
| Container( | ||
| margin: EdgeInsets.all(25), | ||
| child: Column(children: [ | ||
| Container( | ||
| child: Text(isRecording ? "Mic: ON" : "Mic: OFF", | ||
| style: TextStyle(fontSize: 25, color: Colors.blue)), | ||
| margin: EdgeInsets.only(top: 20), | ||
| ), | ||
| Text(''), | ||
| Text('Max amp: ${latestBuffer?.reduce(max)}'), | ||
| Text('Min amp: ${latestBuffer?.reduce(min)}'), | ||
| Text( | ||
| '${recordingTime?.toStringAsFixed(2)} seconds recorded.'), | ||
| ])), | ||
| ])), | ||
| floatingActionButton: FloatingActionButton( | ||
| backgroundColor: isRecording ? Colors.red : Colors.green, | ||
| child: isRecording ? Icon(Icons.stop) : Icon(Icons.mic), | ||
| onPressed: isRecording ? stop : start, | ||
| ), | ||
| ), | ||
| ); | ||
| } |
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