/// <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 systemmediatransportcontrol_ButtonPressed(SystemMediaTransportControls sender,
SystemMediaTransportControlsButtonPressedEventArgs args)
{
switch (args.Button)
{
case SystemMediaTransportControlsButton.Play:
Debug.WriteLine("UVC play button pressed");
// If music is in paused state, for a period of more than 5 minutes,
//app will get task cancellation and it cannot run code.
//However, user can still play music by pressing play via UVC unless a new app comes in clears UVC.
//When this happens, the task gets re-initialized and that is asynchronous and hence the wait
if (!_backgroundtaskrunning)
{
var result = TaskStarted.WaitOne(5000);
if (!result)
{
throw new Exception("Background Task didn't initialize in time");
}
StartPlayback();
}
else
{
BackgroundMediaPlayer.Current.Play();
}
break;
case SystemMediaTransportControlsButton.Pause:
Debug.WriteLine("UVC pause button pressed");
try
{
BackgroundMediaPlayer.Current.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");
if (BackgroundMediaPlayer.Current.Position.TotalSeconds > 20)
{
//StartPlayback();
BackgroundMediaPlayer.Current.Position = TimeSpan.Zero;
BackgroundMediaPlayer.Current.Play();
}
else
{
SkipToPrevious();
}
break;
}
}