private async Task SetPlayer(string url)
        {
            try
            {
                PlayerLoading.Visibility = Visibility.Visible;
                PlayerLoadText.Text      = "加载中";
                if (mediaPlayer != null)
                {
                    mediaPlayer.Pause();
                    mediaPlayer.Source = null;
                }
                if (interopMSS != null)
                {
                    interopMSS.Dispose();
                    interopMSS = null;
                }
                interopMSS = await FFmpegInteropMSS.CreateFromUriAsync(url, _config);

                mediaPlayer.AutoPlay = true;
                mediaPlayer.Source   = interopMSS.CreateMediaPlaybackItem();
                player.SetMediaPlayer(mediaPlayer);
            }
            catch (Exception ex)
            {
                Utils.ShowMessageToast("播放失败" + ex.Message);
            }
        }
 private void StopPlay()
 {
     if (mediaPlayer != null)
     {
         mediaPlayer.Pause();
         mediaPlayer.Source = null;
     }
     if (interopMSS != null)
     {
         interopMSS.Dispose();
         interopMSS = null;
     }
     liveRoomVM.Dispose();
     //取消屏幕常亮
     if (dispRequest != null)
     {
         dispRequest = null;
     }
     liveRoomVM = null;
     SetFullScreen(false);
     MiniWidnows(false);
 }