How to convert an mp3 file to raw audio format using javascript

Question

I'm working on a project that involves song matching, so I am integrating with rapidApi's shazam endpoints. But the thing is, the song matching endpoint needs the audio snippet to be a base64 string of the audio in raw audio format. I know the API works. I downloaded a 3rd party application to do the conversion from mp3 to .raw, and converted it to base64 before making the request with it.

Now, I need to integrate this flow programmatically. How do I convert an mp3 or any audio source really to a .raw file? I've done a lot of searching but I can't find any solution.

Can be done with ffmpeg. Convert the audio file to raw and encode the content as base64 string. — Marc, Oct 03 '22 at 13:11
Hi @Marc Figured as much. I can't find any resource on directions with which I can do that. Can you point me in the right direction. — Lord Bee, Oct 03 '22 at 13:13
https://stackoverflow.com/a/4854627/5781499 Spawn via node a child process, where you execute the command — Marc, Oct 03 '22 at 13:14
Thanks a lot. It worked. I used ffmpeg webassembly package for node and it worked like a charm. — Lord Bee, Oct 03 '22 at 13:35

score 0 · Accepted Answer · answered Oct 03 '22 at 13:38

I went with the @ffmpeg/ffmpeg webassembly package. A javascript port of ffmpeg.

const convertToRaw = async (filePath)=>{
    const ffmpeg = createFFmpeg({ log: true })
    await ffmpeg.load();
    const file = await fetchFile(filePath)
    ffmpeg.FS('writeFile', 'input.mp3', file)
    await ffmpeg.run('-i', 'input.mp3', '-f', 's16le', '-acodec', 'pcm_s16le', '-ac', '1', 'output.raw')
    const data = ffmpeg.FS('readFile', 'output.raw')
    const base64 = Buffer.from(data.buffer).toString('base64')
    return base64
}

score 0 · Answer 2 · answered Oct 04 '22 at 07:11

0

I think the web audio’s decodeAudioData is what you are looking for.

You want the PCM data, right?

answered Oct 04 '22 at 07:11

Yisheng Jiang

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How to convert an mp3 file to raw audio format using javascript

2 Answers2