/// <summary>
/// The Run method is the entry point of a background task.
/// </summary>
/// <param name="taskInstance"></param>
public void Run(IBackgroundTaskInstance taskInstance)
{
Debug.WriteLine("Background Audio Task " + taskInstance.Task.Name + " starting...");
// Initialize SMTC object to talk with UVC.
//Note that, this is intended to run after app is paused and
//hence all the logic must be written to run in background process
systemmediatransportcontrol = SystemMediaTransportControls.GetForCurrentView();
systemmediatransportcontrol.ButtonPressed += systemmediatransportcontrol_ButtonPressed;
systemmediatransportcontrol.PropertyChanged += systemmediatransportcontrol_PropertyChanged;
systemmediatransportcontrol.IsEnabled = true;
systemmediatransportcontrol.IsPauseEnabled = true;
systemmediatransportcontrol.IsPlayEnabled = true;
systemmediatransportcontrol.IsNextEnabled = true;
systemmediatransportcontrol.IsPreviousEnabled = true;
// Associate a cancellation and completed handlers with the background task.
taskInstance.Canceled += new BackgroundTaskCanceledEventHandler(OnCanceled);
taskInstance.Task.Completed += Taskcompleted;
var value = ApplicationSettingsHelper.ReadResetSettingsValue(Constants.AppState);
if (value == null)
{
foregroundAppState = ForegroundAppStatus.Unknown;
}
else
{
foregroundAppState = (ForegroundAppStatus)Enum.Parse(typeof(ForegroundAppStatus), value.ToString());
}
//Add handlers for MediaPlayer
BackgroundMediaPlayer.Current.CurrentStateChanged += Current_CurrentStateChanged;
deferral = taskInstance.GetDeferral();
}
/// <summary>
/// The Run method is the entry point of a background task.
/// </summary>
/// <param name="taskInstance"></param>
public void Run(IBackgroundTaskInstance taskInstance)
{
Debug.WriteLine("Background Audio Task " + taskInstance.Task.Name + " starting...");
// Initialize SystemMediaTransportControls (SMTC) for integration with
// the Universal Volume Control (UVC).
//
// The UI for the UVC must update even when the foreground process has been terminated
// and therefore the SMTC is configured and updated from the background task.
smtc = BackgroundMediaPlayer.Current.SystemMediaTransportControls;
smtc.ButtonPressed += smtc_ButtonPressed;
smtc.PropertyChanged += smtc_PropertyChanged;
smtc.IsEnabled = true;
smtc.IsPauseEnabled = true;
smtc.IsPlayEnabled = true;
smtc.IsNextEnabled = true;
smtc.IsPreviousEnabled = true;
DataObject.DisableDispatcher = true;
// Read persisted state of foreground app
var value = ApplicationSettingsHelper.ReadResetSettingsValue(ApplicationSettingsConstants.AppState);
if (value == null)
{
foregroundAppState = AppState.Unknown;
}
else
{
foregroundAppState = EnumHelper.Parse <AppState>(value.ToString());
}
// Add handlers for MediaPlayer
BackgroundMediaPlayer.Current.CurrentStateChanged += Current_CurrentStateChanged;
BackgroundMediaPlayer.Current.MediaEnded += Current_MediaEnded;
// Initialize message channel
BackgroundMediaPlayer.MessageReceivedFromForeground += BackgroundMediaPlayer_MessageReceivedFromForeground;
// Send information to foreground that background task has been started if app is active
if (foregroundAppState != AppState.Suspended)
{
MessageService.SendMessageToForeground(new BackgroundAudioTaskStartedMessage());
}
ApplicationSettingsHelper.SaveSettingsValue(ApplicationSettingsConstants.BackgroundTaskState, BackgroundTaskState.Running.ToString());
deferral = taskInstance.GetDeferral(); // This must be retrieved prior to subscribing to events below which use it
// Mark the background task as started to unblock SMTC Play operation (see related WaitOne on this signal)
backgroundTaskStarted.Set();
// Associate a cancellation and completed handlers with the background task.
taskInstance.Task.Completed += TaskCompleted;
taskInstance.Canceled += new BackgroundTaskCanceledEventHandler(OnCanceled); // event may raise immediately before continung thread excecution so must be at the end
}
/// <summary>
/// The Run method is the entry point of a background task.
/// </summary>
/// <param name="taskInstance"></param>
public void Run(IBackgroundTaskInstance taskInstance)
{
Debug.WriteLine("Background Audio Task " + taskInstance.Task.Name + " starting...");
// Initialize SMTC object to talk with UVC.
//Note that, this is intended to run after app is paused and
//hence all the logic must be written to run in background process
systemmediatransportcontrol = SystemMediaTransportControls.GetForCurrentView();
systemmediatransportcontrol.ButtonPressed += systemmediatransportcontrol_ButtonPressed;
systemmediatransportcontrol.PropertyChanged += systemmediatransportcontrol_PropertyChanged;
systemmediatransportcontrol.IsEnabled = true;
systemmediatransportcontrol.IsPauseEnabled = true;
systemmediatransportcontrol.IsPlayEnabled = true;
systemmediatransportcontrol.IsNextEnabled = false;
systemmediatransportcontrol.IsPreviousEnabled = false;
systemmediatransportcontrol.IsFastForwardEnabled = false;
// Associate a cancellation and completed handlers with the background task.
taskInstance.Canceled += new BackgroundTaskCanceledEventHandler(OnCanceled);
taskInstance.Task.Completed += Taskcompleted;
var value = ApplicationSettingsHelper.ReadResetSettingsValue(Constants.AppState);
if (value == null)
{
foregroundAppState = ForegroundAppStatus.Unknown;
}
else
{
foregroundAppState = (ForegroundAppStatus)Enum.Parse(typeof(ForegroundAppStatus), value.ToString());
}
//Add handlers for MediaPlayer
BackgroundMediaPlayer.Current.CurrentStateChanged += Current_CurrentStateChanged;
//Add handlers for playlist trackchanged
Playlist.TrackChanged += playList_TrackChanged;
//Initialize message channel
BackgroundMediaPlayer.MessageReceivedFromForeground += BackgroundMediaPlayer_MessageReceivedFromForeground;
//Send information to foreground that background task has been started if app is active
if (foregroundAppState != ForegroundAppStatus.Suspended)
{
ValueSet message = new ValueSet();
message.Add(Constants.BackgroundTaskStarted, "BC Started");
BackgroundMediaPlayer.SendMessageToForeground(message);
}
BackgroundTaskStarted.Set();
backgroundtaskrunning = true;
ApplicationSettingsHelper.SaveSettingsValue(Constants.BackgroundTaskState, Constants.BackgroundTaskRunning);
deferral = taskInstance.GetDeferral();
}
/// <summary>
/// Start playlist and change UVC state
/// </summary>
private async Task StartPlayback(int InternalID = 0)
{
if (InternalID != 0)
{
CurrentMix = Playlist.Single(m => m.InternalID == InternalID);
if (CurrentMix != null)
{
playbackStartedPreviously = true;
await PlayCurrentMix();
return;
}
}
// If playback was already started once we can just resume playing.
if (!playbackStartedPreviously)
{
playbackStartedPreviously = true;
// If the task was cancelled we would have saved the current track and its position. We will try playback from there.
var currentTrackId = ApplicationSettingsHelper.ReadResetSettingsValue(ApplicationSettingsConstants.TrackId);
if (currentTrackId != null)
{
CurrentMix = Playlist.Single(m => m.InternalID == (int)currentTrackId);
if (CurrentMix == null)
{
CurrentMix = Playlist.FirstOrDefault();
}
await PlayCurrentMix();
}
}
else
{
BackgroundMediaPlayer.Current.Play();
}
}
/// <summary>
/// Start playlist and change UVC state
/// </summary>
private void StartPlayback()
{
try
{
if (Playlist.CurrentTrackName == string.Empty)
{
//If the task was cancelled we would have saved the current track and its position. We will try playback from there
var currenttrackname = ApplicationSettingsHelper.ReadResetSettingsValue(Constants.CurrentTrack);
var currenttrackposition = ApplicationSettingsHelper.ReadResetSettingsValue(Constants.Position);
if (currenttrackname != null)
{
if (currenttrackposition == null)
{
// play from start if we dont have position
Playlist.StartTrackAt((string)currenttrackname);
}
else
{
// play from exact position otherwise
Playlist.StartTrackAt((string)currenttrackname, TimeSpan.Parse((string)currenttrackposition));
}
}
else
{
//If we dont have anything, play from beginning of playlist.
Playlist.PlayAllTracks(); //start playback
}
}
else
{
BackgroundMediaPlayer.Current.Play();
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
}
}
/// <summary>
/// Start playlist and change UVC state
/// </summary>
private void StartPlayback()
{
try
{
//If the task was cancelled we would have saved the current track and its position. We will try playback from there
var currenttrackname = ApplicationSettingsHelper.ReadResetSettingsValue(Constants.CurrentTrack);
Debug.WriteLine("Start Playback! || TrackName: " + Playlist.CurrentTrackName.ToString());
Playlist.StartSelectedStream((string)currenttrackname);
if (Playlist.CurrentTrackName == "128")
{
currentTitle = "Vocaloid Radio 128 kbps";
}
else
{
currentTitle = "Vocaloid Radio 192 kbps";
}
UpdateUVCOnNewTrack();
BackgroundMediaPlayer.Current.Play();
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
}
}
/// <summary>
/// Start playlist and change UVC state
/// </summary>
private void StartPlayback()
{
try
{
// If playback was already started once we can just resume playing.
if (!playbackStartedPreviously)
{
playbackStartedPreviously = true;
// If the task was cancelled we would have saved the current track and its position. We will try playback from there.
var currentTrackId = ApplicationSettingsHelper.ReadResetSettingsValue(ApplicationSettingsConstants.TrackId);
var currentTrackPosition = ApplicationSettingsHelper.ReadResetSettingsValue(ApplicationSettingsConstants.Position);
if (currentTrackId != null)
{
// Find the index of the item by name
var index = playbackList.Items.ToList().FindIndex(item =>
GetTrackId(item).ToString() == (string)currentTrackId);
if (currentTrackPosition == null)
{
// Play from start if we dont have position
Debug.WriteLine("StartPlayback: Switching to track " + index);
playbackList.MoveTo((uint)index);
// Begin playing
BackgroundMediaPlayer.Current.Play();
}
else
{
// Play from exact position otherwise
TypedEventHandler <MediaPlaybackList, CurrentMediaPlaybackItemChangedEventArgs> handler = null;
handler = (MediaPlaybackList list, CurrentMediaPlaybackItemChangedEventArgs args) =>
{
if (args.NewItem == playbackList.Items[index])
{
// Unsubscribe because this only had to run once for this item
playbackList.CurrentItemChanged -= handler;
// Set position
var position = TimeSpan.Parse((string)currentTrackPosition);
Debug.WriteLine("StartPlayback: Setting Position " + position);
BackgroundMediaPlayer.Current.Position = position;
// Begin playing
BackgroundMediaPlayer.Current.Play();
}
};
playbackList.CurrentItemChanged += handler;
// Switch to the track which will trigger an item changed event
Debug.WriteLine("StartPlayback: Switching to track " + index);
playbackList.MoveTo((uint)index);
}
}
else
{
// Begin playing
BackgroundMediaPlayer.Current.Play();
}
}
else
{
// Begin playing
BackgroundMediaPlayer.Current.Play();
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
}
}