/// <summary>
/// This method waits for an asynchronous event message from the MF framework.
/// </summary>
/// <param name="eventType">The type of the event to wait for.</param>
/// <param name="specificEventCheckingFunc">A specific event checking func implemented by the caller. Returns false if the event is not handled.</param>
/// <param name="cancelToken">The cancellation token.</param>
internal Task <MF.MediaEvent> WaitForEventAsync(
MF.MediaEventTypes eventType,
Func <MF.MediaEvent, bool> specificEventCheckingFunc,
CancellationToken cancelToken)
{
TaskCompletionSource <MF.MediaEvent> eventWaitTaskResult = new TaskCompletionSource <MF.MediaEvent>();
// Define the wait action
Func <MF.MediaEvent, bool> waitFunc = (givenEventData) =>
{
// Handle cancellation
if (cancelToken.IsCancellationRequested)
{
eventWaitTaskResult.TrySetCanceled();
return(true);
}
// Is this event that one we are waiting for?
if (givenEventData.TypeInfo != eventType)
{
return(false);
}
// Handle result of the given event
if (givenEventData.Status != SharpDX.Result.Ok)
{
eventWaitTaskResult.TrySetException(new SDX.SharpDXException(givenEventData.Status));
}
else
{
// If given, then execute special event checking
if (specificEventCheckingFunc != null)
{
if (!specificEventCheckingFunc(givenEventData))
{
return(false);
}
}
// Finish task
eventWaitTaskResult.TrySetResult(givenEventData);
}
return(true);
};
// Register waiter
lock (m_asyncEventWaitersLock)
{
m_asyncEventWaiters.Add(waitFunc);
}
return(eventWaitTaskResult.Task);
}
/// <summary>
/// This method waits for an asynchronous event message from the MF framework.
/// </summary>
/// <param name="eventType">The type of the event to wait for.</param>
/// <param name="cancelToken">The cancellation token.</param>
internal Task <MF.MediaEvent> WaitForEventAsync(
MF.MediaEventTypes eventType,
CancellationToken cancelToken)
{
return(WaitForEventAsync(eventType, null, cancelToken));
}