Flutter音频处理插件pitchupdart的使用
Flutter音频处理插件pitchupdart的使用
Pitchup Library
pitchupdart
是一个从Kotlin库 pitchup
移植过来的Flutter插件,可用于实现自己的乐器调音应用程序。
Features
目前支持的乐器:吉他
Getting Started
要在项目中导入该库,请在项目的 pubspec.yaml
文件中添加以下依赖:
dependencies:
pitchupdart: ^0.0.6
然后运行 flutter pub get
来安装依赖。
Usage
调用 handlePitch
函数并传入要评估的音高。下面是一个完整的示例代码,展示如何使用该库和如何从音频样本中获取音高。
示例代码
首先,确保你已经添加了必要的依赖项,并创建一个新的Flutter项目。
import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:pitch_detector_dart/pitch_detector.dart';
import 'package:pitchupdart/pitch_handler.dart';
import 'package:pitchupdart/tuning_status.dart';
import 'package:record/record.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: HomeScreen(),
);
}
}
class HomeScreen extends StatefulWidget {
@override
_HomeScreenState createState() => _HomeScreenState();
}
class _HomeScreenState extends State<HomeScreen> {
final AudioRecorder _audioRecorder = AudioRecorder();
final PitchDetector _pitchDetectorDart = PitchDetector(PitchDetector.DEFAULT_SAMPLE_RATE, 2048);
final PitchHandler _pitchupDart = PitchHandler(InstrumentType.guitar);
String note = "N/A";
String status = "Play something";
@override
void initState() {
super.initState();
_startListening();
}
Future<void> _startListening() async {
final recordStream = await _audioRecorder.startStream(
const RecordConfig(
encoder: AudioEncoder.pcm16bits,
numChannels: 1,
bitRate: 128000,
sampleRate: PitchDetector.DEFAULT_SAMPLE_RATE,
),
);
var audioSampleBufferedStream = bufferedListStream(
recordStream.map((event) {
return event.toList();
}),
// The library converts a PCM16 to 8bits internally. So we need twice as many bytes
PitchDetector.DEFAULT_BUFFER_SIZE * 2,
);
await for (var audioSample in audioSampleBufferedStream) {
final intBuffer = Uint8List.fromList(audioSample);
_pitchDetectorDart.getPitchFromIntBuffer(intBuffer).then((detectedPitch) {
if (detectedPitch.pitched) {
_pitchupDart.handlePitch(detectedPitch.pitch).then((pitchResult) {
setState(() {
note = pitchResult.note;
status = getDescription(pitchResult.tuningStatus);
});
});
}
});
}
}
String getDescription(TuningStatus tuningStatus) {
switch (tuningStatus) {
case TuningStatus.tuned:
return "Tuned";
case TuningStatus.toolow:
return "Too low. Tighten the string";
case TuningStatus.toohigh:
return "Too high. Give it some slack";
case TuningStatus.waytoolow:
return "Way too low. Tighten the string";
case TuningStatus.waytoohigh:
return "Way too high. Give it some slack";
case TuningStatus.undefined:
return "Note is not in the valid interval.";
default:
return "Unknown";
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(title: Text('Pitch Detector')),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Text('Detected Note: $note'),
SizedBox(height: 20),
Text('Status: $status'),
],
),
),
);
}
}
解释
AudioRecorder
和PitchDetector
用于录制音频并检测音高。PitchHandler
用于将检测到的音高与吉他的预期音高进行比较,并返回调音状态。- 使用
bufferedListStream
将音频流缓冲为适当的大小以便处理。
更多详细信息和完整示例可以参考 GitHub 示例。
Contributing
如果有任何建议、问题或反馈,请发送电子邮件。如果你改进了库并希望分享,请提交拉取请求。
Privacy Policy
该库不会存储或共享任何个人信息。没有任何数据通过任何方式保存或共享。
更多关于Flutter音频处理插件pitchupdart的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
更多关于Flutter音频处理插件pitchupdart的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html
当然,下面是一个关于如何在Flutter项目中使用pitchupdart
插件进行音频处理的示例代码。pitchupdart
插件可以用于调整音频的音调(pitch),尽管需要注意的是,这个插件的具体实现和API可能会随时间变化,因此请参考其官方文档获取最新信息。
首先,确保在pubspec.yaml
文件中添加pitchupdart
依赖:
dependencies:
flutter:
sdk: flutter
pitchupdart: ^最新版本号 # 请替换为实际的最新版本号
然后运行flutter pub get
来安装依赖。
接下来,编写一个示例Flutter应用,展示如何使用pitchupdart
插件调整音频的音调。
示例代码
main.dart
import 'package:flutter/material.dart';
import 'package:pitchupdart/pitchupdart.dart';
import 'dart:typed_data';
import 'dart:ui' as ui;
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'PitchUpDart Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: PitchUpDartDemo(),
);
}
}
class PitchUpDartDemo extends StatefulWidget {
@override
_PitchUpDartDemoState createState() => _PitchUpDartDemoState();
}
class _PitchUpDartDemoState extends State<PitchUpDartDemo> {
Uint8List? audioData;
double pitchShift = 1.0; // 初始音调不变
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text('PitchUpDart Demo'),
),
body: Padding(
padding: const EdgeInsets.all(16.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text('Adjust Pitch:', style: TextStyle(fontSize: 20)),
Slider(
value: pitchShift,
min: 0.5,
max: 2.0,
divisions: 10,
onChanged: (newValue) {
setState(() {
pitchShift = newValue;
});
},
),
SizedBox(height: 20),
ElevatedButton(
onPressed: loadAndProcessAudio,
child: Text('Load and Process Audio'),
),
SizedBox(height: 20),
if (audioData != null)
AudioPlayerWidget(audioData: audioData!)
],
),
),
);
}
Future<void> loadAndProcessAudio() async {
// 假设你有一个音频文件,这里用本地资源文件作为示例
ByteData byteData = await rootBundle.load('assets/sample.wav');
Uint8List audioBytes = byteData.buffer.asUint8List();
// 使用PitchUpDart处理音频
PitchUpDart pitchUpDart = PitchUpDart();
Uint8List processedAudioData = await pitchUpDart.pitchShift(audioBytes, pitchShift);
setState(() {
audioData = processedAudioData;
});
}
}
class AudioPlayerWidget extends StatefulWidget {
final Uint8List audioData;
AudioPlayerWidget({required this.audioData});
@override
_AudioPlayerWidgetState createState() => _AudioPlayerWidgetState();
}
class _AudioPlayerWidgetState extends State<AudioPlayerWidget> {
late AudioPlayer _player;
@override
void initState() {
super.initState();
_player = AudioPlayer();
_player.setDataSourceFromMemory(widget.audioData);
_player.play();
}
@override
Widget build(BuildContext context) {
return Container(
height: 50,
width: double.infinity,
color: Colors.grey[200],
child: Center(child: Text('Playing Audio...')),
);
}
@override
void dispose() {
_player.stop();
_player.release();
super.dispose();
}
}
注意事项
- 音频文件:确保在
assets
文件夹中有一个名为sample.wav
的音频文件,并在pubspec.yaml
中声明它作为资源。
flutter:
assets:
- assets/sample.wav
-
插件功能:
pitchupdart
插件的具体API和调用方式可能会有所不同,请参考其官方文档(如果可用)获取最新的使用方法和参数说明。 -
音频播放:上述代码使用了
audioplayers
插件(虽然未在pubspec.yaml
中显式声明,但通常用于播放音频)。如果未安装,请添加以下依赖:
dependencies:
audioplayers: ^最新版本号 # 请替换为实际的最新版本号
- 错误处理:为了简洁,示例代码中没有包含错误处理逻辑。在实际应用中,请添加适当的错误处理,比如处理音频文件加载失败或处理过程中出现的异常。
这个示例展示了如何加载音频文件,使用pitchupdart
插件调整音调,并播放处理后的音频。希望这对你有所帮助!