code: public GetMediaSourceDownloadResponse getMediaSourceDownload(String mediaId, long expiredInSeconds) {
          GetMediaSourceDownloadRequest request = new GetMediaSourceDownloadRequest()
                  .withMediaId(mediaId)
                  .withExpiredInSeconds(expiredInSeconds);
          return getMediaSourceDownload(request);
      }
docs: get media source download url.
  
  @param mediaId The unique ID for each media resource
  @param expiredInSeconds The expire time
  @return