// returns S_OK if successfully connected to an IAsyncReader interface
// from this object
// Optional allocator should be proposed as a preferred allocator if
// necessary
HRESULT
CPullPin::Connect(IUnknown* pUnk, IMemAllocator* pAlloc, BOOL bSync) {
CAutoLock lock(&m_AccessLock);
if(m_pReader) {
return VFW_E_ALREADY_CONNECTED;
}
HRESULT hr = pUnk->QueryInterface(IID_IAsyncReader, (void**)&m_pReader);
if(FAILED(hr)) {
return(hr);
}
hr = DecideAllocator(pAlloc, NULL);
if(FAILED(hr)) {
Disconnect();
return hr;
}
LONGLONG llTotal, llAvail;
hr = m_pReader->Length(&llTotal, &llAvail);
if(FAILED(hr)) {
Disconnect();
return hr;
}
// convert from file position to reference time
m_tDuration = llTotal * UNITS;
m_tStop = m_tDuration;
m_tStart = 0;
m_bSync = bSync;
return S_OK;
}
/* This is called after a media type has been proposed
Try to complete the connection by agreeing the allocator
*/
HRESULT
CBaseOutputPin::CompleteConnect(IPin *pReceivePin)
{
UNREFERENCED_PARAMETER(pReceivePin);
return DecideAllocator(m_pInputPin, &m_pAllocator);
}
