HRESULT CPlayer::Invoke(IMFAsyncResult *pResult)
{
HRESULT hr = S_OK;
MediaEventType meType = MEUnknown; // Event type
IMFMediaEvent *pEvent = NULL;
// Get the event from the event queue.
CHECK_HR(hr = m_pSession->EndGetEvent(pResult, &pEvent));
// Get the event type.
CHECK_HR(hr = pEvent->GetType(&meType));
// If the session is closed, the application is waiting on the
// m_hCloseEvent event handle. Also, do not get any more
// events from the session.
if (meType == MESessionClosed)
{
SetEvent(m_hCloseEvent);
}
else
{
// For all other events, ask the media session for the
// next event in the queue.
CHECK_HR(hr = m_pSession->BeginGetEvent(this, NULL));
}
// For most events, we post the event as a private window message to the
// application. This lets the application process the event on it's
// main thread.
// However, if call to IMFMediaSession::Close is pending, it means the
// application is waiting on the m_hCloseEvent event handle. (Blocking
// call.) In that case, we simply discard the event.
// NOTE: When IMFMediaSession::Close is called, MESessionClosed is NOT
// necessarily the next event that we will receive. We may receive
// any number of other events before receiving MESessionClosed.
if (m_state != Closing)
{
// Leave a reference count on the event.
pEvent->AddRef();
PostMessage(m_hwndEvent, WM_APP_PLAYER_EVENT, (WPARAM)pEvent, (LPARAM)0);
}
done:
SAFE_RELEASE(pEvent);
return S_OK;
}
// Callback for the asynchronous BeginGetEvent method.
HRESULT CPlayer::Invoke(IMFAsyncResult *pResult)
{
MediaEventType meType = MEUnknown; // Event type
IMFMediaEvent *pEvent = NULL;
HRESULT hr;
if ( !m_pSession ) {
CI_LOG_W("Called with a null session");
return -1; //Sometimes Invoke is called but m_pSession is closed
}
// Handle async-loading
if ( m_state == OpenAsyncPending ) {
if ( !&m_pSourceResolver ) {
CI_LOG_E("Async request returned with NULL session");
//ofLogError( "CPlayer::Invoke" ) << "Async request returned with NULL session";
return -1;
}
MF_OBJECT_TYPE ObjectType = MF_OBJECT_INVALID;
IUnknown *pSourceUnk = NULL;
//CheckPointer(m_pSource, E_POINTER);
hr = m_pSourceResolver->EndCreateObjectFromURL(
pResult, // Invoke result
&ObjectType, // Receives the created object type.
&pSourceUnk // Receives a pointer to the media source.
);
// Get the IMFMediaSource interface from the media source.
if ( SUCCEEDED( hr ) )
{
hr = pSourceUnk->QueryInterface( __uuidof( IMFMediaSource ), (void**) ( &m_pSource ) );
m_state = OpenAsyncComplete; // Session finished opening URL
}
SafeRelease( &pSourceUnk );
return hr;
}
// Get the event from the event queue.
hr = m_pSession->EndGetEvent(pResult, &pEvent);
CHECK_HR( hr );
// Get the event type.
hr = pEvent->GetType(&meType);
CHECK_HR( hr );
if (meType == MESessionClosed)
{
// The session was closed.
// The application is waiting on the m_hCloseEvent event handle.
SetEvent(m_hCloseEvent);
}
else
{
// For all other events, get the next event in the queue.
hr = m_pSession->BeginGetEvent(this, NULL);
CHECK_HR( hr );
}
// Check the application state.
// If a call to IMFMediaSession::Close is pending, it means the
// application is waiting on the m_hCloseEvent event and
// the application's message loop is blocked.
// Otherwise, post a private window message to the application.
if (m_state != Closing)
{
// Leave a reference count on the event.
pEvent->AddRef();
PostMessage(m_hwndEvent, WM_APP_PLAYER_EVENT,
(WPARAM)pEvent, (LPARAM)meType);
}
done:
SafeRelease(&pEvent);
return S_OK;
}