public static Tuple <IBaseFilter, IBasicAudio> AddSoundRenderer(this IGraphBuilder pGraphBuilder)
{
var baseFilter = DsUtils.GetFilter(Clsid.DSoundRender, false);
if (baseFilter == null)
{
TraceSink.GetTraceSink().TraceWarning("Could not instantiate DirectSound Filter.");
return(null);
}
// add the DirectSound filter to the graph
var hr = pGraphBuilder.AddFilter(baseFilter, "DirectSound Filter");
if (DsHlp.FAILED(hr))
{
Marshal.FinalReleaseComObject(baseFilter);
TraceSink.GetTraceSink().TraceWarning("Could not add DirectSound Filter to the filter graph.");
return(null);
}
IBasicAudio basicAudio = baseFilter as IBasicAudio;
if (basicAudio == null)
{
pGraphBuilder.RemoveFilter(baseFilter);
Marshal.FinalReleaseComObject(baseFilter);
TraceSink.GetTraceSink().TraceWarning("Could not get IBasicAudio interface.");
return(null);
}
return(new Tuple <IBaseFilter, IBasicAudio>(baseFilter, basicAudio));
}
public static IBaseFilter AddFilter(this IGraphBuilder pGraphBuilder, FilterDescription filterDescription)
{
var baseFilter = DsUtils.GetFilter(filterDescription.ClassId, true);
var hr = pGraphBuilder.AddFilter(baseFilter, filterDescription.Name);
if (DsHlp.FAILED(hr))
{
Marshal.FinalReleaseComObject(baseFilter);
hr.ThrowExceptionForHR();
}
return(baseFilter);
}
// this function should be called AFTER the video stream has been rendered
// but before rendering the audio streams
// however, it will try to find the splitter even if video wasn't rendered
private bool FindSplitter(IGraphBuilder pGraphBuilder)
{
if (_splitterFilter != null)
{
DsUtils.RemoveRedundantFilters(_sourceFilter, pGraphBuilder);
return(true);
}
IEnumFilters pEnumFilters = null;
IBaseFilter pFilter = null;
int cFetched;
bool bSplitterFound = false;
int hr = pGraphBuilder.EnumFilters(out pEnumFilters);
if (DsHlp.FAILED(hr))
{
return(false);
}
IPin pPin;
int nFilters = 0;
bool bCanRelease;
while ((pEnumFilters.Next(1, out pFilter, out cFetched) == DsHlp.S_OK))
{
nFilters++;
bCanRelease = true;
pPin = DsUtils.GetPin(pFilter, PinDirection.Output, false, 0);
if (pPin != null)
{
if (DsUtils.IsMediaTypeSupported(pPin, MediaType.Audio) == 0 ||
DsUtils.IsMediaTypeSupported(pPin, MediaType.Subtitle) == 0)
{
//this unconnected pin supports audio or subpicture type!
bSplitterFound = true;
bCanRelease = false;
_splitterFilter = pFilter;
}
Marshal.ReleaseComObject(pPin);
}
//let's have a look at another filter
if (bCanRelease)
{
Marshal.ReleaseComObject(pFilter);
}
if (bSplitterFound)
{
break;
}
}
Marshal.ReleaseComObject(pEnumFilters);
if (!bSplitterFound)
{
if (nFilters > 3)
{
pPin = DsUtils.GetPin(_sourceFilter, PinDirection.Output, true, 0);
if (pPin != null)
{
IPin pInputPin;
hr = pPin.ConnectedTo(out pInputPin);
if (hr == DsHlp.S_OK)
{
PinInfo info = new PinInfo();
hr = pInputPin.QueryPinInfo(out info);
if (hr == DsHlp.S_OK)
{
_splitterFilter = info.pFilter;
bSplitterFound = true;
}
Marshal.ReleaseComObject(pInputPin);
}
Marshal.ReleaseComObject(pPin);
}
}
else
{
_splitterFilter = _sourceFilter;
bSplitterFound = true;
}
}
StripSplitter(pGraphBuilder);
return(bSplitterFound);
}
