How to use the clappr.Events.PLAYBACK_BITRATE function in clappr

this._fillLevels()

    // update stats that may have changed before we trigger event
    // so that user can rely on stats data when handling event
    this._sendStats()

    if (this._pendingAdaptationEvent) {
      this.trigger(Events.PLAYBACK_LEVEL_SWITCH_END)
      this._pendingAdaptationEvent = false
    }

    Log.debug('an adaptation has happened:', activeVideo)
    this.highDefinition = (activeVideo.height >= 720)
    this.trigger(Events.PLAYBACK_HIGHDEFINITIONUPDATE, this.highDefinition)
    this.trigger(Events.PLAYBACK_BITRATE, {
      bandwidth: activeVideo.bandwidth,
      width: activeVideo.width,
      height: activeVideo.height,
      level: activeVideo.id,
      bitrate: activeVideo.videoBandwidth
    })
  }

_onAdaptation() {
    var activeVideo = this.videoTracks.filter((t) => t.active === true)[0]

    this._fillLevels()

    Log.debug('an adaptation has happened:', activeVideo)
    this.highDefinition = (activeVideo.height >= 720)
    this.trigger(Events.PLAYBACK_HIGHDEFINITIONUPDATE, this.highDefinition)
    this.trigger(Events.PLAYBACK_BITRATE, {
      bandwidth: activeVideo.bandwidth,
      width: activeVideo.width,
      height: activeVideo.height,
      level: activeVideo.id
    })
  }