映像進行イベントのトラッキング

var messageCallback = {
  ON_PLAYER_STARTED: (payload)=> {
        //immediately fired once user getting into the player
        console.log('ON_PLAYER_STARTED',payload)
      },
  EVENT_LOG: (payload) => {
        // console.log("event log fired", payload.name);
        // console.log("payload", payload);
        
        switch (payload.name) {
          case "player_on_foreground":
            //player came to foreground and active
            console.log("player_on_foreground",payload);
            break;
          case "player_on_background":
            //player went to background
            console.log("player_on_background",payload);
            break;
          case "player_active_seconds":
            //this event fired every payload.parameter.interval milliseconds. typically per 3seconds. 
            //you can track video progress by either activatedDuration or videoCurrentTime upon your needs
            console.log("player_active_seconds",payload);
            break;
        }
        
      },
}