waveform-playlist/lib/track/loader/XHRLoader.js

Multiple track web audio editor and player with waveform preview

import Loader from "./Loader";
export default class extends Loader {
  /**
   * Loads an audio file via XHR.
   */
  load() {
    return new Promise((resolve, reject) => {
      const xhr = new XMLHttpRequest();
      xhr.open("GET", this.src, true);
      xhr.responseType = "arraybuffer";
      xhr.send();
      xhr.addEventListener("progress", e => {
        super.fileProgress(e);
      });
      xhr.addEventListener("load", e => {
        const decoderPromise = super.fileLoad(e);
        decoderPromise.then(audioBuffer => {
          resolve(audioBuffer);
        }).catch(reject);
      });
      xhr.addEventListener("error", () => {
        reject(Error(`Track ${this.src} failed to load`));
      });
    });
  }

}