reactjs如何将ulaw格式文件转为wav格式 [英] How to convert ulaw format file to wav format reactjs

问题描述

我正在尝试在 reactjs 中播放 .ulaw 格式，我没有找到任何直接播放 ulaw 文件的方法.所以我尝试通过使用 wavfile 插件将 ulaw 格式转换为 wav.但是转换后它播放不同的噪音，我无法确定实际错误在哪里.

I am trying to play .ulaw format in reactjs, I didn't find any straight forward way to play the ulaw file. So I tried to convert ulaw format to wav, by using the wavfile plugin. But after conversion it playing different noise, I am not able to identify where is the actual error.

ulaw 文件详情:

采样率 8000

比特率 64

单声道

import voice from '../src/app/components/voice.ulaw'
const WaveFile = require('wavefile').WaveFile;

let wav = new WaveFile();


const playUlawFile = () => {
    fetch(voice)
        .then(r => r.text())
        .then(text =>  Buffer.from(text, "utf-8").toString("base64"))
        .then(result =>{
            wav.bitDepth = '128000'
            wav.fromScratch(1, 8000, '64', result);
            wav.fromMuLaw();
            wav.toSampleRate(64000);
        return wav;

        }).then(wav => {
            audio = new Audio(wav.toDataURI())
            return audio;
        }).then(audio => {
            audio.play();

        })
}

推荐答案

以下更改对我有用，仍然有一些噪音，但可以产生 80% 的匹配声音.

Below changes worked for me, still some noise is there, but it can produce 80% matching sound.

const readFile = () => {
    fetch(voice)
        .then(r => r.text())
        .then(text =>  btoa(unescape(encodeURIComponent(text)))         )
        .then(result =>{
            wav.fromScratch(1, 18000, '8m', Buffer.from(result, "base64"));
            wav.fromMuLaw(32);
           wav.toSampleRate(64000, {method: "sinc"});
           return wav;
        }).then(wav => {
            audio = new Audio(wav.toDataURI())
            return audio;
        }).then(audio => {
            audio.play();
        })
}

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