轉換.M4A爲.wav

Question

我需要轉換緩衝音頻文件.m4a的緩衝音頻文件.WAV用於發送給Google通過的NodeJS

var toWav = require('audiobuffer-to-wav') 
var xhr = require('xhr') 
var context = new AudioContext() 

// request the MP3 as binary 
xhr({ 
    uri: 'audio/track.mp3', 
    responseType: 'arraybuffer' 
}, function (err, body, resp) { 
    if (err) throw err 
    // decode the MP3 into an AudioBuffer 
    audioContext.decodeAudioData(resp, function (buffer) { 
    // encode AudioBuffer to WAV 
    var wav = toWav(buffer) 

    // do something with the WAV ArrayBuffer ... 
    }) 
}) 

我有錯誤

AudioContext is not defined 

Answer 1

如果語音API你需要使用這個庫服務器端，你可以使用web-audio-api包模擬AudioContext功能。

const fs = require('fs'); 
const toWav = require('audiobuffer-to-wav'); 
const AudioContext = require('web-audio-api').AudioContext; 
const audioContext = new AudioContext; 

let resp = fs.readFileSync('sample.m4a'); 

audioContext.decodeAudioData(resp, buffer => { 
    let wav = toWav(buffer); 
    // do something with the WAV ArrayBuffer ... 
}); 

Answer 2

裁判：https://askubuntu.com/questions/65331/how-to-convert-a-m4a-sound-file-to-mp3

sudo apt-get install libav-tools 

avconv -i input.m4a ouptut.wav 

這對我的作品！