var playerHandler : PlayerHandler = PlayerHandler()

    playerHandler.prepareSongAndSession(
        urlString: "",
        imageUrl: "",
        title: "",
        artist: "",
        albumTitle: "",
           duration: 0)
      
    playerHandler.onIsPlayingChanged { isPlaying in
       //handle play pause buttons
    }
        
    ...

    playerHandler.onProgressChanged { progress in
       // handle time display and tickers
    }

   guard let url = URL(fileURLWithPath:  urlString ) else {
       print("Error: cannot play file")
       return
   }

   guard let url = URL(string: urlString ) else {
       print("Error: cannot create stream URL")
       return
   }