private string GetAllAudioTracks()
{
if (Player.State == PlayerState.Playing || Player.State == PlayerState.Paused)
{
MediaTrack activeTrack = null;
if (Media.AudioTrack != null)
{
activeTrack = Media.AudioTrack;
}
var audioTracks = Media.AudioTracks;
int counter = 1;
StringBuilder audioStringBuilder = new StringBuilder();
foreach (var track in audioTracks)
{
if (counter > 1)
{
audioStringBuilder.Append("]]");
}
audioStringBuilder.Append(counter + ">>" + track.Description + ">>" + track.Type);
if (activeTrack != null && track.Description == activeTrack.Description)
{
audioStringBuilder.Append(">>True");
}
else
{
audioStringBuilder.Append(">>False");
}
counter++;
}
return("AudioTracks|" + audioStringBuilder);
}
return(string.Empty);
}
/// <summary>
/// Create the local sender track from the current media track source if that source
/// is active and enabled. Otherwise do nothing.
/// </summary>
private void CreateSender()
{
Debug.Assert(_source != null);
if (_source.isActiveAndEnabled)
{
if (MediaKind == MediaKind.Audio)
{
var audioSource = (_source as AudioTrackSource);
var initConfig = new LocalAudioTrackInitConfig
{
trackName = _senderTrackName
};
_senderTrack = LocalAudioTrack.CreateFromSource(audioSource.Source, initConfig);
}
else
{
Debug.Assert(MediaKind == MediaKind.Video);
var videoSource = (_source as VideoTrackSource);
var initConfig = new LocalVideoTrackInitConfig
{
trackName = _senderTrackName
};
_senderTrack = LocalVideoTrack.CreateFromSource(videoSource.Source, initConfig);
}
}
}
void DeleteTrackButton_Click(object sender, EventArgs e)
{
//Remove the track data from the database, which also removes the MediaFile data from the data base.
MediaTrack.Remove(theTrack);
RedirectToEditPlayerPage();
}
void TracksGridView_RowCommand(object sender, GridViewCommandEventArgs e)
{
Int32 trackOrder = 0;
switch (e.CommandName)
{
case "MoveUp":
trackOrder = Convert.ToInt32(e.CommandArgument);
MediaTrack.MoveTrackUp(thePlayer.PlayerId, trackOrder);
RedirectToThisPage();
break;
case "MoveDown":
trackOrder = Convert.ToInt32(e.CommandArgument);
MediaTrack.MoveTrackDown(thePlayer.PlayerId, trackOrder);
RedirectToThisPage();
break;
case "EditTrack":
EditTrack(e.CommandArgument.ToString());
break;
default:
break;
}
}
/// <inheritdoc/>
protected internal override void OnUnpaired(MediaTrack track)
{
Debug.Assert(track is RemoteVideoTrack);
Debug.Assert(VideoTrack == track);
VideoTrack = null;
VideoStreamStopped.Invoke(VideoTrack);
}
private string GetAllVideoTracks()
{
if (Player.State != PlayerState.Playing && Player.State != PlayerState.Paused)
{
return(string.Empty);
}
MediaTrack activeTrack = null;
if (Media.VideoTrack != null)
{
activeTrack = Media.VideoTrack;
}
var videoTracks = Media.VideoTracks;
var counter = 1;
var videoStringBuilder = new StringBuilder();
foreach (var track in videoTracks)
{
if (counter > 1)
{
videoStringBuilder.Append("]]");
}
videoStringBuilder.Append(counter + ">>" + track.Description + ">>" + track.Type);
if (activeTrack != null && track.Description == activeTrack.Description)
{
videoStringBuilder.Append(">>True");
}
else
{
videoStringBuilder.Append(">>False");
}
counter++;
}
return("VideoTracks|" + videoStringBuilder);
}
internal void OnUnpaired(MediaTrack track)
{
Debug.Assert(track != null);
// This is called by the TrackRemoved event, which can be fired sometimes even
// though we did not have any opportunity yet to pair. So only unpair if we did.
// In details, the case is the answering peer being in sendonly mode, yet created
// automatically by the implementation during SetRemoteDescription() in recvonly
// mode (per the WebRTC spec). So the SetDirection(sendonly) triggers the TrackRemoved
// event, but the pairing was never done because SetDirection() is called before
// the receiver is updated.
// Callbacks must be called on the main thread.
_peer.InvokeOnAppThread(() =>
{
if (_receiver != null)
{
bool wasReceiving = _remoteTrack != null;
if (wasReceiving)
{
Debug.Assert(_remoteTrack == track);
_receiver.OnUnpaired(_remoteTrack);
}
}
_remoteTrack = null;
});
}
private string GetAllSubtitleTracks()
{
if (Player.State == PlayerState.Playing || Player.State == PlayerState.Paused)
{
MediaTrack activeSub = null;
if (Media.SubtitleTrack != null)
{
activeSub = Media.SubtitleTrack;
}
var subtitles = Media.SubtitleTracks;
int counter = 1;
StringBuilder subSb = new StringBuilder();
foreach (var sub in subtitles)
{
if (counter > 1)
{
subSb.Append("]]");
}
subSb.Append(counter + ">>" + sub.Description + ">>" + sub.Type);
if (activeSub != null && sub.Description == activeSub.Description)
{
subSb.Append(">>True");
}
else
{
subSb.Append(">>False");
}
counter++;
}
return("Subtitles|" + subSb);
}
return(string.Empty);
}
internal void UpdateReceiverPairingIfNeeded()
{
Debug.Assert(Transceiver != null);
// Callbacks must be called on the main Unity app thread.
_peer.EnsureIsMainAppThread();
var newRemoteTrack = Transceiver.RemoteTrack;
if (_receiver != null)
{
bool wasReceiving = _remoteTrack != null;
bool isReceiving = newRemoteTrack != null;
if (isReceiving && !wasReceiving)
{
// Transceiver started receiving, and user actually wants to receive
_receiver.OnPaired(newRemoteTrack);
}
else if (!isReceiving && wasReceiving)
{
// Transceiver stopped receiving (user intent does not matter here)
_receiver.OnUnpaired(_remoteTrack);
}
}
_remoteTrack = newRemoteTrack;
}
public void OnMediaReady(uint mid, WmeDirection direction, WmeSessionType mediaType, MediaTrack pTrack)
{
if (direction == WmeDirection.WmeDirection_Send)
{
if (mid > 10)
{
return;
}
if (mediaType == WmeSessionType.WmeSessionType_Audio)
{
mLocalAudio = pTrack;
}
else if (mediaType == WmeSessionType.WmeSessionType_Video)
{
mLocalVideo = pTrack;
//pTrack.AddRenderWindow(mVideoForm.GetSelfView());
//pTrack.AddRenderWindow(SelfViewPictureBox.Handle);
//pTrack.AddImageRender(LocalVideoImage);
}
else if (mediaType == WmeSessionType.WmeSessionType_ScreenShare)
{
mLocalShare = pTrack;
if (mid == 2)
{
mLocalShare.AddScreenSource(ScreenSourceManager.Instance.defaultSource());
}
}
pTrack.Start(false);
}
else
{
if (mid < 10)
{
return;
}
if (mediaType == WmeSessionType.WmeSessionType_Audio)
{
mRemoteAudio = pTrack;
}
else if (mediaType == WmeSessionType.WmeSessionType_Video)
{
mRemoteVideo = pTrack;
pTrack.AddImageRender(RemoteVideoImage1);
//pTrack.AddImageRender(RemoteVideoImage2);
//pTrack.AddImageRender(RemoteVideoImage3);
//pTrack.AddImageRender(RemoteVideoImage4);
}
else if (mediaType == WmeSessionType.WmeSessionType_ScreenShare)
{
mRemoteShare = pTrack;
if (mid == 2000)
{
//pTrack.AddRenderWindow(ShareViewPictureBox.Handle);
pTrack.AddImageRender(ShareViewImage);
}
}
pTrack.Start(false);
}
}
/// <inheritdoc/>
protected internal override void OnPaired(MediaTrack track)
{
var remoteAudioTrack = (RemoteAudioTrack)track;
Debug.Assert(Track == null);
AudioTrack = remoteAudioTrack;
AudioStreamStarted.Invoke(remoteAudioTrack);
}
void UpdateTrackButton_Click(object sender, EventArgs e)
{
theTrack.Name = TrackNameTextBox.Text;
theTrack.Artist = ArtistTextBox.Text;
MediaTrack.Update(theTrack);
RedirectToEditPlayerPage();
}
public string GetCodecDescription(MediaTrack mediaTrack)
{
IntPtr pStr = LibVlcMethods.libvlc_media_get_codec_description((libvlc_track_type_t)mediaTrack.TrackType, mediaTrack.iCodec);
string desc = Marshal.PtrToStringAnsi(pStr);
LibVlcMethods.libvlc_free(pStr);
return(desc);
}
public static void Track(this IMediaTracker tracker, MediaTrack track)
{
if (track == null)
{
return;
}
tracker.TrackMany(new[] { track });
}
/// <summary>
/// Free-threaded callback invoked by the owning peer connection when a track is unpaired
/// from this receiver.
/// </summary>
internal override void OnUnpaired(MediaTrack track)
{
Debug.Assert(track is RemoteAudioTrack);
Debug.Assert(Track == track);
_track = null;
// Streaming will be stopped from the main Unity app thread, both to avoid locks on public
// properties and so that listeners of the event can directly access Unity objects
// from their handler function.
}
public RtpSession(MediaTrack track, Session session, IRtpSource source)
{
_started = false;
_disposed = false;
_source = source;
Pipelines = new List <MediaPipeline>();
Track = track;
Session = session;
}
/// <inheritdoc/>
void IMediaReceiverInternal.OnPaired(MediaTrack track)
{
var remoteAudioTrack = (RemoteAudioTrack)track;
Debug.Assert(Track == null);
_track = remoteAudioTrack;
// Streaming will be started from the main Unity app thread, both to avoid locks on public
// properties and so that listeners of the event can directly access Unity objects
// from their handler function.
}
protected virtual void TrackSingle(BaseEntity entity, int mediaFileId, MediaTrackOperation operation)
{
Guard.NotNull(entity, nameof(entity));
if (mediaFileId < 1 || entity.IsTransientRecord())
{
return;
}
var file = _dbContext.Set <MediaFile>().Find(mediaFileId);
if (file != null)
{
var albumName = _folderService.FindAlbum(file)?.Value.Name;
if (albumName.IsEmpty())
{
throw new InvalidOperationException("Cannot track a media file that is not assigned to any album.");
}
var track = new MediaTrack
{
EntityId = entity.Id,
EntityName = entity.GetEntityName(),
MediaFileId = mediaFileId,
Album = albumName
};
if (operation == MediaTrackOperation.Track)
{
file.Tracks.Add(track);
}
else
{
var dbTrack = file.Tracks.FirstOrDefault(x => x == track);
if (dbTrack != null)
{
file.Tracks.Remove(track);
_dbContext.ChangeState(dbTrack, System.Data.Entity.EntityState.Deleted);
}
}
if (file.Tracks.Count > 0)
{
// A file with tracks can NEVER be transient
file.IsTransient = false;
}
else if (_makeFilesTransientWhenOrphaned)
{
// But an untracked file can OPTIONALLY be transient
file.IsTransient = true;
}
_dbContext.SaveChanges();
}
}
void AddTrackButton_Click(object sender, EventArgs e)
{
if (SelectedFilesListBox.Items.Count > 0)
{
MediaTrack mt = new MediaTrack();
//Populate the MediaTrack object.
mt.PlayerId = thePlayer.PlayerId;
mt.TrackType = thePlayer.PlayerType;
mt.UserGuid = SiteUtils.GetCurrentSiteUser().UserGuid;
mt.Name = TrackNameTextBox.Text;
mt.Artist = ArtistTextBox.Text;
mt.TrackOrder = TracksGridView.Rows.Count + 1;
try
{
//Add the MediaTrack
mt.TrackId = MediaTrack.Add(mt);
//Add the MediaFiles
foreach (ListItem filePath in SelectedFilesListBox.Items)
{
MediaFile mf = new MediaFile();
mf.TrackId = mt.TrackId;
if (filePath.Text.StartsWith("http"))
{
mf.FilePath = filePath.Text;
}
else
{
mf.FilePath = "~" + filePath.Text;
}
mf.UserGuid = mt.UserGuid;
MediaFile.Add(mf);
}
RedirectToThisPage();
}
catch (Exception ex)
{
//Perform backout actions of anything already saved
//The Forgien key of the MediaFiles table is set up with a Cascading delete, so
//the deleting of the MediaTracks will also delete any related MediaFiles.
MediaTrack.RemoveForPlayer(thePlayer.PlayerId);
//Display error to user
AddTrackErrorLabel.Text = ex.Message;
}
}
else
{
AtLeastOneFileSelectedValidator.IsValid = false;
AddTrackErrorLabel.Text = MediaPlayerResources.AtLeastOneFileSelectedValidatorErrorMessage;
}
}
private void DestroySender()
{
Debug.Assert(_senderTrack != null);
if (MediaKind == MediaKind.Audio)
{
((LocalAudioTrack)_senderTrack).Dispose();
}
else
{
Debug.Assert(MediaKind == MediaKind.Video);
((LocalVideoTrack)_senderTrack).Dispose();
}
_senderTrack = null;
}
/// <summary>
/// Internal callback when the underlying source providing media frames to the sender track
/// is destroyed, and therefore the local media track needs to be destroyed too.
/// </summary>
/// <seealso cref="AudioTrackSource.OnDisable"/>
/// <seealso cref="VideoTrackSource.OnDisable"/>
internal void OnSourceDestroyed()
{
if (_senderTrack is LocalAudioTrack audioTrack)
{
audioTrack.Dispose();
}
else if (_senderTrack is LocalVideoTrack videoTrack)
{
videoTrack.Dispose();
}
_senderTrack = null;
// Clear source, which is about to be destroyed
Source = null;
}
public async Task StopAsync()
{
Debug.WriteLine("MediaPlayerManager.StopAsync()");
var fireTrackChanged = false;
using (await _asyncLock.LockAsync(_cancellationToken).ConfigureAwait(false))
{
if (null != _mediaStreamFacade)
{
var stopped = false;
try
{
stopped = await _mediaStreamFacade.RequestStopAsync(TimeSpan.FromSeconds(5), _cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
Debug.WriteLine("MediaPlayerManager.StopAsync() RequestStopAsync() failed: " + ex.ExtendedMessage());
}
if (!stopped)
{
try
{
await CleanupMediaStreamFacadeAsync().ConfigureAwait(false);
}
catch (Exception ex)
{
Debug.WriteLine("MediaPlayerManager.StopAsync() CleanupMediaStreamFacadeAsync() failed: " + ex.ExtendedMessage());
}
}
}
if (null != _track)
{
_track = null;
fireTrackChanged = true;
}
await CloseMediaSourceAsync().WithCancellation(_cancellationToken).ConfigureAwait(false);
}
if (fireTrackChanged)
{
FireTrackChanged();
}
}
/// <inheritdoc/>
void IMediaReceiverInternal.OnPaired(MediaTrack track)
{
var remoteVideoTrack = (RemoteVideoTrack)track;
// Enqueue invoking from the main Unity app thread, both to avoid locks on public
// properties and so that listeners of the event can directly access Unity objects
// from their handler function.
InvokeOnAppThread(() =>
{
Debug.Assert(Track == null);
Track = remoteVideoTrack;
_isLive = true;
IsStreaming = true;
VideoStreamStarted.Invoke(this);
});
}
/// <summary>
/// Free-threaded callback invoked by the owning peer connection when a track is paired
/// with this receiver, which enqueues the <see cref="AudioSource.AudioStreamStarted"/>
/// event to be fired from the main Unity app thread.
/// </summary>
internal override void OnPaired(MediaTrack track)
{
var remoteAudioTrack = (RemoteAudioTrack)track;
// Enqueue invoking from the main Unity app thread, both to avoid locks on public
// properties and so that listeners of the event can directly access Unity objects
// from their handler function.
_mainThreadWorkQueue.Enqueue(() =>
{
Debug.Assert(Track == null);
Track = remoteAudioTrack;
IsLive = true;
AudioStreamStarted.Invoke(this);
IsStreaming = true;
});
}
/// <summary>
/// Free-threaded callback invoked by the owning peer connection when a track is unpaired
/// from this receiver, which enqueues the <see cref="VideoSource.VideoStreamStopped"/>
/// event to be fired from the main Unity thread.
/// </summary>
internal override void OnUnpaired(MediaTrack track)
{
Debug.Assert(track is RemoteVideoTrack);
// Enqueue invoking from the main Unity app thread, both to avoid locks on public
// properties and so that listeners of the event can directly access Unity objects
// from their handler function.
_mainThreadWorkQueue.Enqueue(() =>
{
Debug.Assert(Track == track);
Track = null;
IsStreaming = false;
IsLive = false;
VideoStreamStopped.Invoke(this);
});
}
/// <inheritdoc/>
void IMediaReceiverInternal.OnUnpaired(MediaTrack track)
{
Debug.Assert(track is RemoteAudioTrack);
// Enqueue invoking from the main Unity app thread, both to avoid locks on public
// properties and so that listeners of the event can directly access Unity objects
// from their handler function.
InvokeOnAppThread(() =>
{
Debug.Assert(Track == track);
Track = null;
_isLive = false;
AudioStreamStopped.Invoke(this);
IsStreaming = false;
});
}
private bool GetRedirectUri(RtspClient client, MediaTrack track, out Uri uri)
{
var transport = TransportHeader.CreateBuilder()
.Type(TransportType.RtspInterleaved)
.InterleavedChannels(0, 1)
.Build();
var method = RtspRequest.RtspMethod.SETUP;
var res = CheckResponse(client.Send(RtspRequest.CreateBuilder()
.Method(method)
.Uri(track.ControlUri)
.AddHeader(RtspHeaders.Names.TRANSPORT, transport.ToString())
.Build()), method);
if (!res.Headers.ContainsKey(RtspHeaders.Names.SESSION))
{
uri = null;
return(false);
}
var rtspSession = Session.Parse(res.Headers[RtspHeaders.Names.SESSION]);
method = RtspRequest.RtspMethod.PLAY;
res = CheckResponse(client.Send(RtspRequest.CreateBuilder()
.Method(method)
.Uri(track.ControlUri)
.AddHeader(RtspHeaders.Names.SESSION, rtspSession.ID)
.Build()), method);
var status = res.ResponseStatus;
if (status.Is(RtspResponse.Status.MovedPermanently) || status.Is(RtspResponse.Status.MovedTemporarily))
{
// We received a redirect lets get the uri and return it.
if (res.Headers.ContainsKey(RtspHeaders.Names.LOCATION))
{
var value = res.Headers[RtspHeaders.Names.LOCATION];
return(Uri.TryCreate(value, UriKind.RelativeOrAbsolute, out uri));
}
}
uri = null;
return(false);
}
internal void OnUnpaired(MediaTrack track)
{
Debug.Assert(track != null);
Debug.Assert(Transceiver != null);
Debug.Assert(Transceiver.RemoteTrack == null); // already removed
// This is called by the TrackRemoved event, which can be fired sometimes even
// though we did not have any opportunity yet to pair. So only unpair if we did.
// In details, the case is the answering peer being in sendonly mode, yet created
// automatically by the implementation during SetRemoteDescription() in recvonly
// mode (per the WebRTC spec). So the SetDirection(sendonly) triggers the TrackRemoved
// event, but the pairing was never done because SetDirection() is called before
// the received is updated.
if (_isReceiverPaired)
{
_peer.InvokeOnAppThread(() => _receiver.OnUnpaired(track));
_isReceiverPaired = false;
}
}
private MediaTrack[] MapTextTracks(string textTracks)
{
List <MediaTrack> tracks = new List <MediaTrack>();
if (!string.IsNullOrEmpty(textTracks))
{
string[] tracksInfo = textTracks.Split(Constants.MultiItemsSeparator);
foreach (string trackInfo in tracksInfo)
{
MediaTrack track = new MediaTrack();
string[] textTrack = trackInfo.Split(Constants.MultiItemSeparator);
track.Type = textTrack[0];
track.Source = textTrack[1];
track.Language = StreamFile.GetLanguageCode(track.Source);
tracks.Add(track);
}
}
return(tracks.ToArray());
}
private void addTrack(string path, bool isTutoPatch, int episodeNumber, EditorModel model)
{
var seconds = Model.WindowState.TimeSet;
var track = new MediaTrack(path, Model.ScaleInfo, isTutoPatch);
track.ModelHash = model == null ? "" : model.Montage.RawVideoHash;
track.EpisodeNumber = episodeNumber;
track.LeftShiftInSeconds = seconds;
track.TopShift = Top;
track.DurationInPixels = 10;
Model.PropertyChanged += (s, a) => track.NotifyScaleChanged();
Model.MediaTracks.Add(track);
PatchWindow.MediaOpened += SetPatchDuration;
PatchWindow.Stop();
PatchWindow.Source = null;
PatchWindow.Source = new Uri(path);
PatchWindow.Play(); //need to fire event to get duration
PatchWindow.Pause();
}
public async Task StopAsync()
{
Debug.WriteLine("MediaPlayerManager.StopAsync()");
var fireTrackChanged = false;
using (await _asyncLock.LockAsync(_cancellationToken).ConfigureAwait(false))
{
if (null != _mediaStreamFacade)
{
var stopped = false;
try
{
stopped = await _mediaStreamFacade.RequestStopAsync(TimeSpan.FromSeconds(5), _cancellationToken).ConfigureAwait(false);
}
catch (Exception ex)
{
Debug.WriteLine("MediaPlayerManager.StopAsync() RequestStopAsync() failed: " + ex.ExtendedMessage());
}
if (!stopped)
{
try
{
await CleanupMediaStreamFacadeAsync().ConfigureAwait(false);
}
catch (Exception ex)
{
Debug.WriteLine("MediaPlayerManager.StopAsync() CleanupMediaStreamFacadeAsync() failed: " + ex.ExtendedMessage());
}
}
}
if (null != _track)
{
_track = null;
fireTrackChanged = true;
}
await CloseMediaSourceAsync().WithCancellation(_cancellationToken).ConfigureAwait(false);
}
if (fireTrackChanged)
FireTrackChanged();
}
/*
public void GetSubitems()
{
return GetSubitemsFunction.Delegate(InstancePointer);
}
*/
/// <summary>
/// 获取媒体的基本流的描述,注意,在调用该方法之前你需要首先调用 <see cref="VlcMedia.Parse"/> 方法,或者至少播放一次.
/// 否则,你将的得到一个空数组
/// </summary>
public MediaTrack[] GetTracks()
{
var pointer = IntPtr.Zero;
uint count = GetTracksFunction.Delegate(InstancePointer, ref pointer);
if(pointer == IntPtr.Zero)
{
String ex = VlcError.GetErrorMessage();
throw new Exception(ex);
}
var result = new MediaTrack[count];
var temp = pointer;
for (int i = 0; i < count; i++)
{
var p = Marshal.ReadIntPtr(temp);
result[i] = (MediaTrack)Marshal.PtrToStructure(p, typeof(MediaTrack));
temp += Marshal.SizeOf(typeof(IntPtr));
}
ReleaseTracksFunction.Delegate(pointer, count);
return result;
}
async Task StartPlaybackAsync(MediaTrack track)
{
Debug.WriteLine("MediaPlayerManager.StartPlaybackAsync() " + (null == track ? "<null>" : track.ToString()));
try
{
using (await _asyncLock.LockAsync(_cancellationToken).ConfigureAwait(false))
{
_track = null;
if (null == track || null == track.Url)
{
await CloseMediaSourceAsync().WithCancellation(_cancellationToken).ConfigureAwait(false);
FireTrackChanged();
return;
}
var url = track.Url;
BackgroundSettings.Track = url;
if (url.HasExtension(".pls"))
{
url = await GetUrlFromPlsPlaylistAsync(url).ConfigureAwait(false);
}
_track = track;
FireTrackChanged();
try
{
_mediaPlayer.AutoPlay = false;
if (track.UseNativePlayer)
{
_mediaPlayer.SetUriSource(url);
}
else
{
await InitializeMediaStreamAsync().ConfigureAwait(false);
var mss = await _mediaStreamFacade.CreateMediaStreamSourceAsync(url, _cancellationToken).ConfigureAwait(false);
if (null == mss)
{
Debug.WriteLine("MediaPlayerManager.StartPlaybackAsync() unable to create media stream source");
return;
}
_mediaPlayer.SetMediaSource(mss);
}
return;
}
catch (OperationCanceledException)
{ }
catch (Exception ex)
{
Debug.WriteLine("MediaPlayerManager.StartPlaybackAsync() source setup failed: " + ex.Message);
}
await CloseMediaSourceAsync().WithCancellation(_cancellationToken).ConfigureAwait(false);
}
}
catch (Exception ex)
{
Debug.WriteLine("MediaPlayerManager.StartPlaybackAsync() failed: " + ex.Message);
}
}
