public int Invoke(IMFAsyncResult asyncResult)
{
IMFMediaEvent mediaEvent = null;
this.mediaSession.EndGetEvent(asyncResult, out mediaEvent);
// Get the session event type
uint type = Consts.MESessionUnknown;
mediaEvent.GetType(out type);
// Get the session event HRESULT
int status = 0;
mediaEvent.GetStatus(out status);
// Fire the C# event
if (this.MediaEvent != null)
{
this.MediaEvent(type, status);
}
// Get the next session event
this.mediaSession.BeginGetEvent(this, null);
return(0);
}
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);
}
void IMFAsyncCallback.Invoke(IMFAsyncResult pResult)
{
IMFMediaEvent pEvent = null;
MediaEventType meType = MediaEventType.MEUnknown; // Event type
int hrStatus = 0; // Event status
MFTopoStatus TopoStatus = MFTopoStatus.Invalid; // Used with MESessionTopologyStatus event.
try
{
// Get the event from the event queue.
m_pSession.EndGetEvent(pResult, out pEvent);
// Get the event type.
pEvent.GetType(out meType);
// Get the event status. If the operation that triggered the event did
// not succeed, the status is a failure code.
pEvent.GetStatus(out hrStatus);
TRACE(string.Format("Media event: " + meType.ToString()));
// Check if the async operation succeeded.
if (Succeeded(hrStatus))
{
// Switch on the event type. Update the internal state of the CPlayer as needed.
switch (meType)
{
case MediaEventType.MESessionTopologyStatus:
// Get the status code.
int i;
pEvent.GetUINT32(MFAttributesClsid.MF_EVENT_TOPOLOGY_STATUS, out i);
TopoStatus = (MFTopoStatus)i;
switch (TopoStatus)
{
case MFTopoStatus.Ready:
OnTopologyReady(pEvent);
break;
default:
// Nothing to do.
break;
}
break;
case MediaEventType.MESessionStarted:
OnSessionStarted(pEvent);
break;
case MediaEventType.MESessionPaused:
OnSessionPaused(pEvent);
break;
case MediaEventType.MESessionClosed:
OnSessionClosed(pEvent);
break;
case MediaEventType.MEEndOfPresentation:
OnPresentationEnded(pEvent);
break;
}
}
else
{
// The async operation failed. Notify the application
NotifyError(hrStatus);
}
}
finally
{
// Request another event.
if (meType != MediaEventType.MESessionClosed)
{
m_pSession.BeginGetEvent(this, null);
}
SafeRelease(pEvent);
}
}
/// +=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=
/// <summary>
/// Part of the IMFAsyncCallback interface. This is called when an
/// asynchronous operation is completed.
/// </summary>
/// <param name="pResult">Pointer to the IMFAsyncResult interface. </param>
/// <returns>S_OK for success, others for fail</returns>
/// <history>
/// 01 Nov 18 Cynic - Originally Written
/// </history>
HResult IMFAsyncCallback.Invoke(IMFAsyncResult pResult)
{
HResult hr;
IMFMediaEvent eventObj = null;
MediaEventType meType = MediaEventType.MEUnknown; // Event type
HResult hrStatus = 0; // Event status
lock (this)
{
try
{
if (MediaSession == null)
{
return(HResult.S_OK);
}
// Complete the asynchronous request this is tied to the previous BeginGetEvent call
// and MUST be done. The output here is a pointer to the IMFMediaEvent interface describing
// this event. Note we MUST release this interface
hr = MediaSession.EndGetEvent(pResult, out eventObj);
if (hr != HResult.S_OK)
{
throw new Exception("IMFAsyncCallback.Invoke call to MediaSession.EndGetEvent failed. Err=" + hr.ToString());
}
if (eventObj == null)
{
throw new Exception("IMFAsyncCallback.Invoke call to MediaSession.EndGetEvent failed. eventObj == null");
}
// Get the event type. The event type indicates what happened to trigger the event.
// It also defines the meaning of the event value.
hr = eventObj.GetType(out meType);
if (hr != HResult.S_OK)
{
throw new Exception("IMFAsyncCallback.Invoke call to IMFMediaEvent.GetType failed. Err=" + hr.ToString());
}
// Get the event status. If the operation that generated the event was successful,
// the value is a success code. A failure code means that an error condition triggered the event.
hr = eventObj.GetStatus(out hrStatus);
if (hr != HResult.S_OK)
{
throw new Exception("IMFAsyncCallback.Invoke call to IMFMediaEvent.GetStatus failed. Err=" + hr.ToString());
}
// Check if we are being told that the the async event succeeded.
if (hrStatus != HResult.S_OK)
{
// The async operation failed. Notify the application
if (MediaSessionAsyncCallBackError != null)
{
MediaSessionAsyncCallBackError(this, "Error Code =" + hrStatus.ToString(), null);
}
}
else
{
// we are being told the operation succeeded and therefore the event contents are meaningful.
// Switch on the event type.
switch (meType)
{
// we let the app handle all of these. There is not really much we can do here
default:
MediaSessionAsyncCallBackEvent(this, eventObj, meType);
break;
}
}
}
catch (Exception ex)
{
// The async operation failed. Notify the application
if (MediaSessionAsyncCallBackError != null)
{
MediaSessionAsyncCallBackError(this, ex.Message, ex);
}
}
finally
{
// Request another event if we are still operational.
if (((meType == MediaEventType.MESessionClosed) || (meType == MediaEventType.MEEndOfPresentation)) == false)
{
// Begins an asynchronous request for the next event in the queue
hr = MediaSession.BeginGetEvent(this, null);
if (hr != HResult.S_OK)
{
throw new Exception("IMFAsyncCallback.Invoke call to MediaSession.BeginGetEvent failed. Err=" + hr.ToString());
}
}
// release the event we just processed
if (eventObj != null)
{
Marshal.ReleaseComObject(eventObj);
}
}
} // bottom of lock(this)
return(HResult.S_OK);
}