instrunet_backend/c0.js

import {parentPort} from "worker_threads";
import Kali from "@descript/kali";
import {workerData} from "worker_threads";
try{

    let decodeAudio = await import('audio-decode')
    let decoders = decodeAudio.decoders;
    await decoders.mp3();

    let decoded = await decoders.mp3(
        workerData.binary
    )



    let kali = new Kali(1)
    let samplerate = decoded.sampleRate / workerData.pitch
    kali.setup(samplerate, workerData.pitch, true)
    kali.input(decoded.getChannelData(workerData.channel))
    kali.process()
    let output = new Float32Array(samplerate * decoded.duration)
    kali.output(output);
    parentPort.postMessage({output, samplerate})
}catch(err){
    console.log(err)
}