CODEWITHSUNDEEP
javascriptnode.jsfacebookaudiobase64
Nguyễn Thu Phương
Nguyễn Thu Phương

Reputation: 45

Convert audio from url to base64 in nodejs?

I want to send a voice clip to facebook messenger and have it translated to text using Google Cloud Speech to text. However, facebook messenger format set the url to the file, and I have no idea to convert it to base 64. If it's an image like .png and .jpg, it's fine, there are packages for that. But I am trying to convert audio like .mp3 and .m4a files. Is there any tool for that to work with nodejs.

I would prefer not to save the audio file as a local file, beause I am deploying a server using Google App Engine, and doing so will just make the matter super complicated.

Upvotes: 0

Views: 5292

Answers (3)

Turkyden
Turkyden

Reputation: 11

import mineType from 'mime-types';

const getBase64 = async (url) => {
  try {
    const response = await axios.get(url, { responseType: 'arraybuffer' });
    const base64 = Buffer.from(response.data, 'binary').toString('base64');
    return "data:" + mineType.lookup(url) + ";base64," + base64;
  }catch (e) {
    return "";
  }
}

Upvotes: 1

Nguyễn Thu Phương
Nguyễn Thu Phương

Reputation: 45

I got what I need from here. While the question is about image, the code seems to work fine sound.

const getBase64 = async (url) => {
    try {
        var result =  await  axios
            .get(url, {
                responseType: 'arraybuffer'
            })
            .then(response =>  new Buffer.from(response.data, 'binary').toString('base64'))


        return { data: result}
    }catch (e) {
        return {error: e};
    }
}

Upvotes: 1

Rich
Rich

Reputation: 301

You can look into the FileReader API and possibly the AudioData API - between those two you should have everything you need. With sending audio files over the wire, you don't transfer them as base64. I believe it is either binary or blob iirc.

You can use the FileReader api - read in your audio file using FileReader.readAsArrayBuffer() which will convert your file into a mapped array. From there, you can turn it into a blob object and push it wherever you need. 

             var uInt8Array     = new Uint8Array(mappedArray);
             var arrayBuffer    = uInt8Array.buffer;
             var blob           = new Blob([arrayBuffer]);
             var url            = URL.createObjectURL(blob);

I use this same approach when working with Amazon's Polly to turn text into speech

Upvotes: 0

Related Questions