/// <summary>
/// Processes the media session event.
/// </summary>
private void ProcessEvent()
{
while (m_Session != null)
{
try {
m_Session.GetEvent(1, out IMFMediaEvent _event);//requests events and returns immediately
_event.GetType(out MediaEventType eventtype);
switch (eventtype)
{
case MediaEventType.MESessionEnded:
PlaybackState = PlaybackState.Stopped;
PlaybackStopped?.Invoke(this, new StoppedEventArgs());
break;
case MediaEventType.MESessionTopologyStatus: //topology loaded
Guid guidManager = typeof(IAudioSessionManager).GUID;
(new MMDeviceEnumeratorComObject() as IMMDeviceEnumerator).
GetDefaultAudioEndpoint(CoreAudioApi.DataFlow.Render, CoreAudioApi.Role.Multimedia, out IMMDevice endoint);
endoint.Activate(ref guidManager, ClsCtx.ALL, IntPtr.Zero, out object _manager);
IAudioSessionManager manager = _manager as IAudioSessionManager;
manager.GetSimpleAudioVolume(Guid.Empty, 0, out m_volume);
m_Session.GetClock(out m_clock);
Guid guid_ratecontrol = typeof(IMFRateControl).GUID;
Guid MF_RATE_CONTROL_SERVICE = Guid.Parse("866fa297-b802-4bf8-9dc9-5e3b6a9f53c9");
MediaFoundationInterop.MFGetService(m_Session, ref MF_RATE_CONTROL_SERVICE, ref guid_ratecontrol, out object _control); //gets rate control
m_rate = _control as IMFRateControl;
Prepared = true;
break;
}
_event = null;
}
catch (COMException e)
{
if (e.HResult == MediaFoundationErrors.MF_E_NO_EVENTS_AVAILABLE)
{
continue;
}
else
{
throw e;
}
}
catch (ThreadAbortException)
{
break;
}
}
}
private void ProcesssMediaEvents()
{
Dispatcher.BeginInvoke((Action) delegate
{
if (m_pSession != null)
{
IMFMediaEvent pmet;
MFEventFlag flags = MFEventFlag.NoWait;
/* Get all the queued events from the interface */
while (m_pSession.GetEvent(flags, out pmet) == 0)
{
/* Handle anything for this event code */
OnMediaEvent(pmet);
}
}
});
}
private static HResult RunMediaSession(IMFMediaSession mediaSession)
{
HResult hr = S_OK;
bool receiveSessionEvent = true;
while (receiveSessionEvent)
{
HResult hrStatus = S_OK;
IMFMediaEvent mediaEvent = null;
MediaEventType eventType = MediaEventType.MEUnknown;
MFTopoStatus topoStatus = MFTopoStatus.Invalid;
hr = mediaSession.GetEvent(MFEventFlag.None, out mediaEvent);
if (Succeeded(hr))
{
hr = mediaEvent.GetStatus(out hrStatus);
}
if (Succeeded(hr))
{
hr = mediaEvent.GetType(out eventType);
}
if (Succeeded(hr) && Succeeded(hrStatus))
{
switch (eventType)
{
case MediaEventType.MESessionTopologySet:
Debug.WriteLine("MediaSession:TopologySetEvent");
break;
case MediaEventType.MESessionTopologyStatus:
Debug.WriteLine("MediaSession:TopologStatusEvent");
hr = mediaEvent.GetUINT32(MF_EVENT_TOPOLOGY_STATUS, out int topoStatusInt);
if (Succeeded(hr))
{
topoStatus = (MFTopoStatus)topoStatusInt;
switch (topoStatus)
{
case MFTopoStatus.Ready:
Debug.WriteLine("MediaSession:TopologyStatus: MFTopoStatus.Ready");
hr = mediaSession.Start();
break;
default:
Debug.WriteLine("MediaSession:TopologyStatus: MFTopoStatus." + topoStatus);
break;
}
}
break;
case MediaEventType.MESessionClosed:
Debug.WriteLine("MediaSession:SessionClosedEvent");
receiveSessionEvent = false;
break;
case MediaEventType.MESessionStopped:
Debug.WriteLine("MediaSession:SesssionStoppedEvent");
hr = mediaSession.Stop();
break;
default:
Debug.WriteLine("MediaSession:Event: " + eventType);
break;
}
mediaEvent = null;
if (Failed(hr) || Failed(hrStatus))
{
receiveSessionEvent = false;
}
}
}
return(hr);
}
