HRESULT CSampleCGB::RenderToMPEG2Demux( IPin *pPin )
{
if(!pPin)
{
return E_INVALIDARG;
}
REGPINMEDIUM pinMedium;//pin所支持的媒体类型如果媒体类型的CLSID为GUID_NULL或者KSMEDIUMSETID_Standard，那么pin就没法连接。
HRESULT hr = GetMedium(pPin,pinMedium);
if(FAILED(hr))return hr;
SmartPtr<IEnumMoniker> pEncoders;
if(::IsEqualGUID(pinMedium.clsMedium,GUID_NULL))
{
hr = GetEncodersByCategory(&pEncoders);
if(FAILED(hr))return hr;
hr = RenderToMPEG2Demux( pPin, pEncoders );
if( SUCCEEDED( hr ) )
{
return S_OK;
}
}
else
{
//
// search through encoders category; identify
// the encoder using the medium
//
hr = GetEncodersByCategory( &pEncoders );
if( FAILED( hr ) )
{
return hr;
}
hr = RenderToMPEG2Demux( pPin, pinMedium, pEncoders );
if( SUCCEEDED( hr ) )
{
return S_OK;
}
pEncoders = NULL;
hr = GetEncodersByEnumerating( pinMedium, &pEncoders );
if( FAILED( hr ) )
{
return hr;
}
hr = RenderToMPEG2Demux( pPin, pinMedium, pEncoders );
if( FAILED( hr ) )
{
return hr;
}
}
return S_OK;
}
HRESULT
ISampleCaptureGraphBuilder::RenderToMPEG2Demux( IPin *pPin )
{
if( !pPin )
{
return E_INVALIDARG;
}
REGPINMEDIUM pinMedium;
HRESULT hr = GetMedium( pPin, pinMedium );
if( FAILED( hr ) )
{
return hr;
}
SmartPtr< IEnumMoniker > pEncoders;
if( ::IsEqualGUID( pinMedium.clsMedium, GUID_NULL ) )
{
//
// Search throgh the codec category
//
hr = GetEncodersByCategory( &pEncoders );
if( FAILED( hr ) )
{
return hr;
}
hr = RenderToMPEG2Demux( pPin, pEncoders );
if( SUCCEEDED( hr ) )
{
return S_OK;
}
}
else
{
//
// search through encoders category; identify
// the encoder using the medium
//
hr = GetEncodersByCategory( &pEncoders );
if( FAILED( hr ) )
{
return hr;
}
hr = RenderToMPEG2Demux( pPin, pinMedium, pEncoders );
if( SUCCEEDED( hr ) )
{
return S_OK;
}
pEncoders = NULL;
hr = GetEncodersByEnumerating( pPin, pinMedium, &pEncoders );
if( FAILED( hr ) )
{
return hr;
}
hr = RenderToMPEG2Demux( pPin, pinMedium, pEncoders );
if( FAILED( hr ) )
{
return hr;
}
}
return S_OK;
}
HRESULT
ISampleCaptureGraphBuilder::ConnectAudioPinToMultiplexer(
IPin *pPin,
IBaseFilter *pMultiplexer)
{
if( !pPin || !pMultiplexer )
{
return E_INVALIDARG;
}
REGPINMEDIUM pinMedium;
HRESULT hr = GetMedium( pPin, pinMedium );
if( FAILED( hr ) )
{
return hr;
}
SmartPtr<IBaseFilter> pEncoder;
SmartPtr<IEnumMoniker> pEncoders;
if( FALSE == ::IsEqualGUID( pinMedium.clsMedium, GUID_NULL ) )
{
//
// search through encoders category; identify
// the encoder using the medium
//
hr = GetEncodersByCategory( &pEncoders );
if( FAILED( hr ) )
{
return hr;
}
hr = FindEncoder( pEncoders, pinMedium, &pEncoder );
if( SUCCEEDED( hr ) )
{
hr = graph_->AddFilter( pEncoder, L"Audio Encoder" );
if( SUCCEEDED( hr ) &&
SUCCEEDED( ConnectPin( pPin, pEncoder ) ) &&
SUCCEEDED( ConnectFilters( pEncoder, pMultiplexer ) )
)
{
return S_OK;
}
}
pEncoders = NULL;
hr = GetEncodersByEnumerating( pPin, pinMedium, &pEncoders );
if( FAILED( hr ) )
{
return hr;
}
hr = FindEncoder( pEncoders, pinMedium, &pEncoder );
if( SUCCEEDED( hr ) )
{
hr = graph_->AddFilter( pEncoder, L"Audio Encoder" );
if( SUCCEEDED( hr ) &&
SUCCEEDED( ConnectPin( pPin, pEncoder ) ) &&
SUCCEEDED( ConnectFilters( pEncoder, pMultiplexer ) )
)
{
return S_OK;
}
}
return E_FAIL;
}
//
// Search throgh the codec category
//
hr = GetEncodersByCategory( &pEncoders );
if( FAILED( hr ) )
{
return hr;
}
SmartPtr<IBaseFilter> pFilter;
SmartPtr<IMoniker> pMoniker;
ULONG fetched;
while( pFilter.Release(), pMoniker.Release(), S_OK == pEncoders->Next( 1, &pMoniker, &fetched ) )
{
hr = pMoniker->BindToObject(
0, 0, IID_IBaseFilter, reinterpret_cast<void **>( &pFilter ) );
if( FAILED( hr ) )
{
continue;
}
hr = graph_->AddFilter( pFilter, L"Audio Encoder" );
if( FAILED( hr ) )
{
continue;
}
hr = ConnectPin( pPin, pFilter );
if( FAILED( hr ) )
{
graph_->RemoveFilter( pFilter );
continue;
}
hr = ConnectFilters( pFilter, pMultiplexer );
if( SUCCEEDED( hr ) )
{
return S_OK;
}
graph_->RemoveFilter( pFilter );
}
return E_FAIL;
}
