//////////////////////////////////////////////////////////////////
//
// GetTerminalFromStreamEvent - get the stream from the event and
// after this get the terminal from stream - if any
//
//////////////////////////////////////////////////////////////////
HRESULT GetTerminalFromStreamEvent(
IN ITCallMediaEvent * pCallMediaEvent,
OUT ITTerminal ** ppTerminal )
{
//
//do not return bogus value
//
*ppTerminal = NULL;
//
// Get the stream for this event.
//
ITStream * pStream = NULL;
HRESULT hr = pCallMediaEvent->get_Stream( &pStream );
if (FAILED(hr))
{
DoMessage( _T("GetTerminalFromStreamEvent: get_Stream failed"));
return E_FAIL;
}
//
// Enumerate the terminals on this stream.
//
IEnumTerminal * pEnumTerminal = NULL;
hr = pStream->EnumerateTerminals( &pEnumTerminal );
//
//not need this anymore
//
pStream->Release();
if ( FAILED(hr) )
{
DoMessage(_T("GetTerminalFromStreamEvent: EnumerateTerminals failed"));
return hr;
}
//
// Get the first terminal -- if there aren't any, return E_FAIL so that
// we skip this event (this happens when the terminal is on the other
// stream).
//
hr = pEnumTerminal->Next(1, ppTerminal, NULL);
//
//clean up
//
pEnumTerminal->Release();
//
//map anything but S_OK to failure - even S_FALSE
//
if ( hr != S_OK )
{
return E_FAIL;
}
return S_OK;
}
HRESULT
GetVideoRenderTerminalFromStreamEvent(
ITCallMediaEvent * pCallMediaEvent,
ITTerminal ** ppTerminal,
BOOL * pfRenderStream
)
{
HRESULT hr;
//
// Get the stream for this event.
//
ITStream * pStream;
hr = pCallMediaEvent->get_Stream( &pStream );
if ( FAILED(hr) || (pStream == NULL) )
{
return E_FAIL;
}
//
// Find out if this is a video stream. If not, fail --
// we don't care about this stream.
//
long lMediaType;
hr = pStream->get_MediaType(&lMediaType);
if ( FAILED(hr) )
{
pStream->Release();
return hr;
}
if ( lMediaType != TAPIMEDIATYPE_VIDEO )
{
pStream->Release();
return E_FAIL;
}
//
// Find out the direction of this stream. We will return this info to the
// caller.
//
TERMINAL_DIRECTION td;
hr = pStream->get_Direction(&td);
if ( FAILED(hr) )
{
pStream->Release();
return hr;
}
*pfRenderStream = (td == TD_RENDER);
//
// Enumerate the terminals on this stream.
//
IEnumTerminal * pEnumTerminal;
hr = pStream->EnumerateTerminals( &pEnumTerminal );
pStream->Release();
if ( FAILED(hr) )
{
return hr;
}
//
// Search for the first video render terminal and return it. If there are
// none, fail -- we don't care about this stream.
//
while ( S_OK == pEnumTerminal->Next(1, ppTerminal, NULL) )
{
if ( SUCCEEDED( (*ppTerminal)->get_Direction(&td) ) )
{
if ( td == TD_RENDER )
{
// found it; done with enum, but keep ref on terminal
pEnumTerminal->Release();
return S_OK;
}
}
// this is not the right one
(*ppTerminal)->Release();
}
pEnumTerminal->Release();
return E_FAIL; // no terminal found
}
