Flutter音频处理插件pitchupdart的使用

发布于 1周前 作者 phonegap100 来自 Flutter

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

  • AudioRecorderPitchDetector 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

1 回复

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

  1. 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
  1. 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。

  2. 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
  1. 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!

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