/// <summary>
/// Preview archive fragments
/// </summary>
/// <param name="camera">Selected camera</param>
/// <returns></returns>
/// <remarks>
/// TODO: Improve performance. Solve freeze behavior.
/// </remarks>
private async Task InitFragmentsAsync(CameraViewModel camera)
{
try
{
_fragments.Clear();
camera.Model.Fragments.Clear();
DateTime dateEnd = DateTime.Now.ToUniversalTime();
DateTime dateStart = new DateTime(year: dateEnd.Year - 1,
month: dateEnd.Month,
day: dateEnd.Day,
hour: dateEnd.Hour,
minute: dateEnd.Minute,
second: dateEnd.Second);
string url = _spec.GetArchiveUrl(camera.Model, dateStart, dateEnd);
XmlDocument doc = await SpecificationModel.GetXmlDocAsync(url);
await camera.Model.InitFragments(doc);
foreach (ArchiveFragment f in camera.Model.Fragments)
{
_fragments.Add(new ArchiveFragmentViewModel(f.FromTime, f.ToTime));
}
}
catch (InvalidOperationException e)
{
System.Diagnostics.Debug.WriteLine(e.Message);
}
}
private void DummyInitCamera(string text = "None")
{
_cameras.Clear();
CameraViewModel empty = new CameraViewModel(new Camera(name: text, id: null));
_cameras.Add(empty);
}
public async void ChangeStream(CameraViewModel camera, DateTime?time)
{
CloseStream();
if (camera.Id == null) // Dummy camera
{
Timestamp = "";
_fragments.Clear();
SetStartScreen();
return;
}
CancellationToken token = _cts.Token;
InitFragmentsAsync(camera);
string url = _spec.GetStreamRequestUrl(camera.Model, time);
try
{
await _stream.StartAsync(url, token);
}
catch (OperationCanceledException)
{
System.Diagnostics.Debug.WriteLine("User cancel stream.");
}
}