public static MediaPlaybackItem Create(object source, string title)
{
MediaPlaybackItem item = new MediaPlaybackItem();
if (source != null && !string.IsNullOrEmpty(source.ToString()))
{
item.Source = new Uri(source.ToString());
item.Title = title;
}
return item;
}
public static MediaPlaybackItem Create(object source, object title, object position)
{
MediaPlaybackItem item = new MediaPlaybackItem();
if(source != null && !string.IsNullOrEmpty(source.ToString()))
{
item.Source = new Uri(source.ToString());
item.Title = title == null ? string.Empty : title.ToString();
TimeSpan.TryParse(position.ToString(), out item.Position);
}
return item;
}
/// <summary>
/// Update Universal Volume Control (UVC) using SystemMediaTransPortControl APIs
/// </summary>
private void UpdateUVCOnNewTrack(MediaPlaybackItem item)
{
if (item == null)
{
smtc.PlaybackStatus = MediaPlaybackStatus.Stopped;
smtc.DisplayUpdater.MusicProperties.Title = string.Empty;
smtc.DisplayUpdater.Update();
return;
}
smtc.PlaybackStatus = MediaPlaybackStatus.Playing;
smtc.DisplayUpdater.Type = MediaPlaybackType.Music;
smtc.DisplayUpdater.MusicProperties.Title = item.Title;
var albumArtUri = item.Source;
if (albumArtUri != null)
smtc.DisplayUpdater.Thumbnail = RandomAccessStreamReference.CreateFromUri(albumArtUri);
else
smtc.DisplayUpdater.Thumbnail = null;
smtc.DisplayUpdater.Update();
}
/// <summary>
/// This function controls the button events from UVC.
/// This code if not run in background process, will not be able to handle button pressed events when app is suspended.
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
private void smtc_ButtonPressed(SystemMediaTransportControls sender, SystemMediaTransportControlsButtonPressedEventArgs args)
{
switch (args.Button)
{
case SystemMediaTransportControlsButton.Play:
Debug.WriteLine("UVC play button pressed");
// When the background task has been suspended and the SMTC
// starts it again asynchronously, some time is needed to let
// the task startup process in Run() complete.
// Wait for task to start.
// Once started, this stays signaled until shutdown so it won't wait
// again unless it needs to.
bool result = backgroundTaskStarted.WaitOne(5000);
if (!result)
throw new Exception("Background Task didnt initialize in time");
if (currentPlaybackItem == null)
{
var currentTrackId = ApplicationSettingsHelper.ReadResetSettingsValue(ApplicationSettingsConstants.TrackId);
var currentTitle = ApplicationSettingsHelper.ReadResetSettingsValue(ApplicationSettingsConstants.TrackTitle);
var currentTrackPosition = ApplicationSettingsHelper.ReadResetSettingsValue(ApplicationSettingsConstants.Position);
currentPlaybackItem = MediaPlaybackItem.Create(currentTrackId, currentTitle, currentTrackPosition);
playbackCurrentItemChanged(currentPlaybackItem);
currentPlaybackItem.Play();
} else
{
currentPlaybackItem.Resume();
}
break;
case SystemMediaTransportControlsButton.Pause:
Debug.WriteLine("UVC pause button pressed");
try
{
currentPlaybackItem.Pause();
}
catch (Exception ex)
{
Debug.WriteLine(ex.ToString());
}
break;
case SystemMediaTransportControlsButton.Next:
Debug.WriteLine("UVC next button pressed");
//SkipToNext();
break;
case SystemMediaTransportControlsButton.Previous:
Debug.WriteLine("UVC previous button pressed");
//SkipToPrevious();
break;
}
}
/// <summary>
/// Raised when playlist changes to a new track
/// </summary>
/// <param name="sender"></param>
/// <param name="args"></param>
void playbackCurrentItemChanged(MediaPlaybackItem item)
{
// Get the new item
Debug.WriteLine("PlaybackList_CurrentItemChanged: " + (item == null ? "null" : GetTrackId(item).ToString()));
// Update the system view
UpdateUVCOnNewTrack(item);
ApplicationSettingsHelper.SaveSettingsValue(
ApplicationSettingsConstants.TrackId, item.Source.ToString()
);
ApplicationSettingsHelper.SaveSettingsValue(
ApplicationSettingsConstants.Position, TimeSpan.Zero.ToString()
);
MessageService.SendMessageToForeground(new TrackChangedMessage(item.Source));
}
Uri GetTrackId(MediaPlaybackItem item)
{
if (item == null)
return null; // no track playing
//return item.Source.CustomProperties[TrackIdKey] as Uri;
return item.Source; ;
}
public static bool TryCreate(object source, object title, object position, out MediaPlaybackItem item)
{
item = MediaPlaybackItem.Create(source, title, position);
return item.Source != null;
}
