Flutter音频倾斜检测插件pitch_detector_plus_platform_interface的使用

简介

pitch_detector_plus_platform_interface 是一个用于音频倾斜检测的 Flutter 插件。它允许开发者在移动设备上检测音频信号的频率（音高）。该插件提供了跨平台的支持，适用于 Android 和 iOS。

本文将通过一个完整的示例代码展示如何使用 pitch_detector_plus_platform_interface 插件来实现音频倾斜检测功能。

使用步骤

1. 添加依赖

首先，在项目的 pubspec.yaml 文件中添加 pitch_detector_plus_platform_interface 依赖：

dependencies:
  pitch_detector_plus_platform_interface: ^0.0.1

然后运行以下命令以更新依赖：

flutter pub get

2. 初始化插件

在 Dart 文件中导入插件并初始化音频检测器：

import 'package:flutter/material.dart';
import 'package:pitch_detector_plus_platform_interface/pitch_detector_plus_platform_interface.dart';

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: AudioDetectionPage(),
    );
  }
}

3. 实现音频检测逻辑

创建一个页面来处理音频输入并检测音高：

class AudioDetectionPage extends StatefulWidget {
  [@override](/user/override)
  _AudioDetectionPageState createState() => _AudioDetectionPageState();
}

class _AudioDetectionPageState extends State<AudioDetectionPage> {
  late PitchDetector pitchDetector;
  double? detectedPitch;

  [@override](/user/override)
  void initState() {
    super.initState();
    // 初始化音频检测器
    pitchDetector = PitchDetector();
    startListening();
  }

  Future<void> startListening() async {
    try {
      await pitchDetector.startListening(onPitchDetected);
    } catch (e) {
      print('Error starting audio detection: $e');
    }
  }

  void onPitchDetected(double pitch) {
    setState(() {
      detectedPitch = pitch;
    });
  }

  [@override](/user/override)
  void dispose() {
    // 停止音频监听
    pitchDetector.stopListening();
    super.dispose();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('音频倾斜检测'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              '检测到的音高:',
              style: TextStyle(fontSize: 20),
            ),
            Text(
              detectedPitch != null ? '${detectedPitch.toStringAsFixed(2)} Hz' : '未检测到音高',
              style: TextStyle(fontSize: 30, fontWeight: FontWeight.bold),
            ),
          ],
        ),
      ),
    );
  }
}

4. 运行应用

确保您的设备或模拟器已连接，并运行以下命令启动应用：

flutter run

当您对麦克风说话或播放音频时，应用会实时检测音高并在屏幕上显示结果。

完整示例代码

以下是完整的示例代码，包括依赖配置和 UI 部分：

import 'package:flutter/material.dart';
import 'package:pitch_detector_plus_platform_interface/pitch_detector_plus_platform_interface.dart';

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

class MyApp extends StatelessWidget {
  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: AudioDetectionPage(),
    );
  }
}

class AudioDetectionPage extends StatefulWidget {
  [@override](/user/override)
  _AudioDetectionPageState createState() => _AudioDetectionPageState();
}

class _AudioDetectionPageState extends State<AudioDetectionPage> {
  late PitchDetector pitchDetector;
  double? detectedPitch;

  [@override](/user/override)
  void initState() {
    super.initState();
    // 初始化音频检测器
    pitchDetector = PitchDetector();
    startListening();
  }

  Future<void> startListening() async {
    try {
      await pitchDetector.startListening(onPitchDetected);
    } catch (e) {
      print('Error starting audio detection: $e');
    }
  }

  void onPitchDetected(double pitch) {
    setState(() {
      detectedPitch = pitch;
    });
  }

  [@override](/user/override)
  void dispose() {
    // 停止音频监听
    pitchDetector.stopListening();
    super.dispose();
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('音频倾斜检测'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              '检测到的音高:',
              style: TextStyle(fontSize: 20),
            ),
            Text(
              detectedPitch != null ? '${detectedPitch.toStringAsFixed(2)} Hz' : '未检测到音高',
              style: TextStyle(fontSize: 30, fontWeight: FontWeight.bold),
            ),
          ],
        ),
      ),
    );
  }
}