static createDrmInfo(keySystem, encryptionScheme, initData, keySystemUri) {
    const drmInfo = {
      keySystem,
      encryptionScheme,
      licenseServerUri: '',
      distinctiveIdentifierRequired: false,
      persistentStateRequired: false,
      audioRobustness: '',
      videoRobustness: '',
      serverCertificate: null,
      serverCertificateUri: '',
      sessionType: '',
      initData: initData || [],
      keyIds: new Set(),
    };

    if (keySystemUri) {
      drmInfo.keySystemUris = new Set([keySystemUri]);
    }

    return drmInfo;
  }
Creates a DrmInfo object from the given info.

@param {string} keySystem
@param {string} encryptionScheme
@param {Array<shaka.extern.InitDataOverride>} initData
@param {string} [keySystemUri]
@return {shaka.extern.DrmInfo}