ITuner::put_TuneRequest() call ignored - c++

Question

I have a DirectShow graph with a "Microsoft DVBT Network Provider", "AVerMedia BDA DVBT Tuner", "AVerMEdia BDA Digital Capture", "Sample Grabber" and "NULL Renderer".
These filters are connected.
Beside that I also have an "MPEG-2 Demultiplexer" and a "BDA MPEG2 Transport Information Filter", but these two filters are NOT connected! It seems like they have to be here in order to run the graph.
When I start the graph, I'm receiving TS data, but no matter what I do, I'm not able to put the tuning request. I can only capture the MUX data from the last tuned frequency with some other application like Windows Media Center.
Here is the code for putting the tune request:
// creating tuning space
CComPtr<IDVBTuningSpace> pDVBTuningSpace;<br>
hr = pDVBTuningSpace.CoCreateInstance( __uuidof( DVBTuningSpace ) );
WCHAR szFriendlyName[ 64 ] = L"Local DVB-T Digital Antenna";<br> BSTR bstrFriendlyName = SysAllocString( szFriendlyName );
hr = pDVBTuningSpace->put_UniqueName( bstrFriendlyName );<br>
hr = pDVBTuningSpace->put_FriendlyName( bstrFriendlyName );
SysFreeString( bstrFriendlyName );
CComBSTR clsid_dvbt = ("{216C62DF-6D7F-4e9a-8571-05F14EDB766A}");<br>
hr = pDVBTuningSpace->put_NetworkType( clsid_dvbt );<br>
hr = pDVBTuningSpace->put_SystemType( DVB_Terrestrial );<br>
// creating tune request<br>
CComPtr<ITuneRequest> pTuneRequest;
hr = pDVBTuningSpace->CreateTuneRequest( &pTuneRequest );
CComQIPtr<IDVBTuneRequest> pDVBTuneRequest( pTuneRequest );
hr = pDVBTuneRequest->put_ONID( -1 );<br>
hr = pDVBTuneRequest->put_TSID( -1 );<br>
hr = pDVBTuneRequest->put_SID( -1 );
// locator<br>
CComPtr<IDVBTLocator> pDVBTLocator;
hr = pDVBTLocator.CoCreateInstance( __uuidof( DVBTLocator ) );<br>
hr = pDVBTLocator->put_Bandwidth( 8 );<br>
hr = pDVBTLocator->put_CarrierFrequency( 506000 );
hr = pDVBTuneRequest->put_Locator( pDVBTLocator );
CComQIPtr<ITuner> pTuner( pNetworkProvider_ );
hr = pTuner->put_TuneRequest( pDVBTuneRequest );
This is executed immediately after adding the "Microsoft DVBT Network Provider" filter in the graph.
All "hr" values from the above code are S_OK.
What am I doing wrong? Or, did I miss something big in this "tune request" thing.
(Bandwidth and frequency values are correct)

Answer 1

I think put_Bandwidth( 8 ) is wrong, it should be a bandwidth in Hz. Anyway, I show you some code I use. Maybe it helps.
HRESULT hr;
CComBSTR TuningName;
hr = pDVBTuningSpace2.CoCreateInstance(CLSID_DVBTuningSpace);
hr = pDVBTuningSpace2->put_SystemType(DVB_Terrestrial);
TuningName = L"My DVB-T";
hr = pDVBTuningSpace2->put__NetworkType(CLSID_DVBTNetworkProvider);
CComPtr <IDVBTLocator> pDVBTLocator;
hr = pDVBTLocator.CoCreateInstance(CLSID_DVBTLocator);
hr = pDVBTLocator->put_CarrierFrequency(config->GetFreq());
hr = pDVBTLocator->put_Bandwidth(config->GetSymbolRate());
hr = pDVBTuningSpace2->put_DefaultLocator(pDVBTLocator);
hr = pDVBTuningSpace2->put_UniqueName(TuningName);
hr = pDVBTuningSpace2->put_FriendlyName(TuningName);
hr = pDVBTuningSpace2->put_FrequencyMapping(L"");
CComPtr <ITuningSpaceContainer> pTuningSpaceContainer;
hr = pTuningSpaceContainer.CoCreateInstance(CLSID_SystemTuningSpaces);
VARIANT tiIndex;
hr = pTuningSpaceContainer->Add(pDVBTuningSpace2,&tiIndex);
if (!SUCCEEDED(hr)) {
// Get the enumerator for the collection.
CComPtr<IEnumTuningSpaces> pTuningSpaceEnum;
hr = pTuningSpaceContainer->get_EnumTuningSpaces(&pTuningSpaceEnum);
if (SUCCEEDED(hr)) {
// Loop through the collection.
CComPtr<ITuningSpace> pTuningSpace;
//ITuningSpace *pTuningSpace;
tiIndex.intVal=0;
while (S_OK == pTuningSpaceEnum->Next(1, &pTuningSpace, NULL)) {
USES_CONVERSION;
BSTR Name;
hr = pTuningSpace->get_UniqueName(&Name);
if (SUCCEEDED(hr)) {
if (wcscmp(OLE2W(Name), TuningName) == 0) {
hr = pTuningSpaceContainer->put_Item(tiIndex,pDVBTuningSpace2);
}
SysFreeString(Name);
}
tiIndex.intVal++;
//pTuningSpace->Release();
pTuningSpace.Release();
}
}
}
CComPtr<ITuneRequest> pTuneRequest;
hr = pDVBTuningSpace2->CreateTuneRequest(&pTuneRequest);
CComQIPtr<IDVBTuneRequest> pDVBTuneRequest(pTuneRequest);
if(pDVBTuneRequest) {
hr = pDVBTuneRequest->put_SID(config->GetSid());
hr = pDVBTuneRequest->put_TSID(config->GetTsid());
hr = pDVBTuneRequest->put_ONID(config->GetOnid());
}
GUID CLSIDNetworkType;
hr = pDVBTuningSpace2->get__NetworkType(&CLSIDNetworkType);
hr = CoCreateInstance(CLSIDNetworkType, NULL, CLSCTX_INPROC_SERVER,
IID_IBaseFilter, (void **) &pNetworkProvider);
hr = graph->AddFilter(pNetworkProvider,L"Network Provider");
// Query for ITuner.
CComQIPtr<ITuner> pTuner(pNetworkProvider);
if (pTuner) {
// Submit the tune request to the network provider.
hr = pTuner->put_TuneRequest(pTuneRequest);
}
hr = graph->AddFilter(pBdaNetworkTuner,L"BDA Source");
hr = ConnectFilters(pNetworkProvider,pBdaNetworkTuner);
CComPtr<IBaseFilter> pBdaReceiver;
hr = FindDevice(KSCATEGORY_BDA_RECEIVER_COMPONENT, &pBdaReceiver, 0, 0, 0);
hr = graph->AddFilter(pBdaReceiver,L"BDA Receiver");
hr = ConnectFilters(pBdaNetworkTuner,pBdaReceiver);
CComPtr<IBaseFilter> pMpegDemux;
hr = pMpegDemux.CoCreateInstance(CLSID_MPEG2Demultiplexer);
hr = graph->AddFilter(pMpegDemux,L"MPEG Demux");
hr = ConnectFilters(pBdaReceiver,pMpegDemux);
You are doing some things in a different order, but I'm not sure if it matters.