usingPresentationStartTime() {
    // If it's VOD, IPR, or an HLS "event", we are not using the presentation
    // start time.
    if (this.presentationStartTime_ == null) {
      return false;
    }

    // If we have explicit segment times, we're not using the presentation
    // start time.
    if (this.maxSegmentEndTime_ != null && this.autoCorrectDrift_) {
      return false;
    }

    return true;
  }
True if the presentation start time is being used to calculate the live
edge.
Using the presentation start time means that the stream may be subject to
encoder drift.  At runtime, we will avoid using the presentation start time
whenever possible.

@return {boolean}
@export