Flutter音频处理插件pcmtowave的使用

pcmtowave 是一个用于将 PCM 数据实时转换为 WAV 格式的 Flutter 插件。以下是如何使用该插件的详细步骤。

使用

首先，你需要在你的项目中初始化 pcmtowave 并设置参数。以下是基本用法：

final _pcmtowave = convertToWav(
  sampleRate: 44100, 
  converMiliSeconds: 1000, // 每秒转换一次
  numChannels: 2  
);

// 开始录音
final stream = await record.startStream(const RecordConfig(
  encoder: AudioEncoder.pcm16bits
));
isrecord = true;

stream.listen((event) {
  _pcmtowave.run(event); // 将录制的数据转换为wav格式
});

// 监听转换后的wav数据
_pcmtowave.convert.listen((event) async {
  data = event;
});

_pcmtowave.dispose();

完整示例

以下是一个完整的示例，展示了如何在 Flutter 应用程序中使用 pcmtowave 插件进行音频处理。

示例代码

import 'dart:convert';
import 'dart:io';

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

import 'package:flutter/services.dart';
import 'package:path_provider/path_provider.dart';
import 'package:pcmtowave/convertToWav.dart';
import 'package:pcmtowave/pcmtowave.dart';
import 'package:record/record.dart';

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

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  [@override](/user/override)
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';

  // 初始化
  final _pcmtowave = convertToWav(
    sampleRate: 44100,
    converMiliSeconds: 1000,
    numChannels: 2
  );
  final record = AudioRecorder();
  final player = AudioPlayer();

  String text = "";

  [@override](/user/override)
  void initState() {
    super.initState();
    _pcmtowave.convert.listen((event) async {
      // 在这里处理转换后的wav数据
    });
  }

  bool isrecord = false;

  Uint8List? data;

  recor() async {
    if (await record.hasPermission()) {
      // 开始录音到文件或流
      if (!isrecord) {
        final stream = await record.startStream(const RecordConfig(
            encoder: AudioEncoder.pcm16bits
        ));
        isrecord = true;

        stream.listen((event) {
          _pcmtowave.run(event); // 转换录制的数据为wav格式
        });
      } else {
        record.stop();
        isrecord = false;
      }
    }
    setState(() {});
  }

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('pcm'),
        ),
        body: Column(
          children: [
            Container(
              margin: const EdgeInsets.all(3),
              padding: const EdgeInsets.all(3),
              height: 80,
              width: double.infinity,
              alignment: Alignment.center,
              decoration: BoxDecoration(
                color: Color(0xFFFAF0E6),
                border: Border.all(
                  color: Colors.indigo,
                  width: 3,
                ),
              ),
              child: Row(children: [
                ElevatedButton(
                  onPressed: () {
                    recor();
                  },
                  child: Text(isrecord ? '停止' : '开始录音'),
                ),
                SizedBox(
                  width: 20,
                ),
                Text(isrecord ? '正在录音' : '录音已停止'),
              ]),
            ),
            Container(
              margin: const EdgeInsets.all(3),
              padding: const EdgeInsets.all(3),
              height: 80,
              width: double.infinity,
              alignment: Alignment.center,
              decoration: BoxDecoration(
                color: Color(0xFFFAF0E6),
                border: Border.all(
                  color: Colors.indigo,
                  width: 3,
                ),
              ),
              child: Row(children: [
                SizedBox(
                  width: 20,
                ),
                Text(text),
              ]),
            ),
          ],
        )
      ),
    );
  }
}