async Task <IMediaStreamConfiguration> IMediaStreamControl.OpenAsync(CancellationToken cancellationToken)
{
if (null == this._mediaStreamSource)
{
throw new InvalidOperationException("MediaStreamSource has not been created");
}
IMediaManager mediaManager = this.MediaManager;
if (null == mediaManager)
{
throw new InvalidOperationException("MediaManager has not been initialized");
}
TaskCompletionSource <IMediaStreamConfiguration> openCompletionSource = this._openCompletionSource;
Action cancellationAction = (Action)(() =>
{
Task task = mediaManager.CloseMediaAsync();
TaskCollector.Default.Add(task, "MediaSteamConfigurator.OpenAsync mediaManager.CloseMediaAsync");
openCompletionSource.TrySetCanceled();
});
using (cancellationToken.Register(cancellationAction))
{
Task timeoutTask = TaskEx.Delay(MediaStreamConfigurator.OpenTimeout, cancellationToken);
Task task = await TaskEx.WhenAny((Task)this._openCompletionSource.Task, timeoutTask).ConfigureAwait(false);
}
if (!this._openCompletionSource.Task.IsCompleted)
{
cancellationAction();
}
return(await this._openCompletionSource.Task.ConfigureAwait(false));
}
