function isPlayable( obj, tracksBy, index ) {

    var natives = tracksBy[ index ]._natives;

    if ( !natives ||
        ( !!Popcorn.registryByName[ natives.type ] || !!obj[ natives.type ] ) ) {
      return true;
    }
    return false;
  }

  function isAllowed( obj, trackEvent, which, currentTime ) {

    if ( trackEvent[ which ] > currentTime &&
          trackEvent._running === false &&
            obj.data.disabled.indexOf( trackEvent._natives.type ) === -1 ) {

      return true;
    }
    return false;
  }

  function playTrackEvent( obj, event, trackEvent, which, state ) {

    var method;

    if ( trackEvent._natives ) {
      method = trackEvent._natives[ which ];

      trackEvent._running = state;

      if ( method ) {
        method.call( obj, event, trackEvent );
      }
    }

    return trackEvent;
  }

  function playIfAllowed( opts ) {
    if ( isAllowed( opts.instance, opts.trackEvent, opts.which, opts.currentTime ) ) {
      playTrackEvent( opts.instance, opts.event, opts.trackEvent, opts.which, opts.state );
    }
  }