/// <summary>
/// Frees all unmanaged memory and resets the object back
/// to its initial state
/// </summary>
protected override void FreeResources()
{
#if DEBUG
/* Remove us from the ROT */
if (m_dsRotEntry != null)
{
m_dsRotEntry.Dispose();
m_dsRotEntry = null;
}
#endif
/* We run the StopInternal() to avoid any
* Dispatcher VeryifyAccess() issues because
* this may be called from the GC */
StopInternal();
if (m_graph != null)
{
DirectShowUtil.RemoveFilters(m_graph);
Marshal.ReleaseComObject(m_graph);
m_graph = null;
base.FreeResources();
/* Only run the media closed if we have an
* initialized filter graph */
InvokeMediaClosed(new EventArgs());
}
else
{
base.FreeResources();
}
}
private bool DoesItHaveVideo(string filename)
{
if (string.IsNullOrEmpty(filename))
{
return(false);
}
bool result;
IGraphBuilder temp_graph = new FilterGraphNoThread() as IGraphBuilder;
try
{
if (temp_graph == null)
{
throw new WPFMediaKitException("Could not create a graph");
}
var filterGraph = temp_graph as IFilterGraph2;
if (filterGraph == null)
{
throw new WPFMediaKitException("Could not QueryInterface for the IFilterGraph2");
}
IBaseFilter sourceFilter;
int hr;
sourceFilter = DirectShowUtil.AddFilterToGraph(temp_graph, SplitterSource, LAVFilterDirectory, Guid.Empty);
if (sourceFilter == null)
{
throw new WPFMediaKitException("Could not add SplitterSource to graph.");
}
IFileSourceFilter interfaceFile = (IFileSourceFilter)sourceFilter;
hr = interfaceFile.Load(filename, null);
DsError.ThrowExceptionForHR(hr);
// Set Video Codec
// Remove Pin
var videoPinFrom = DirectShowLib.DsFindPin.ByName(sourceFilter, "Video");
IPin videoPinTo;
if (videoPinFrom != null)
{
hr = videoPinFrom.ConnectedTo(out videoPinTo);
if (hr >= 0 && videoPinTo != null)
{
PinInfo pInfo;
videoPinTo.QueryPinInfo(out pInfo);
FilterInfo fInfo;
pInfo.filter.QueryFilterInfo(out fInfo);
DirectShowUtil.DisconnectAllPins(temp_graph, pInfo.filter);
temp_graph.RemoveFilter(pInfo.filter);
DsUtils.FreePinInfo(pInfo);
Marshal.ReleaseComObject(fInfo.pGraph);
Marshal.ReleaseComObject(videoPinTo);
videoPinTo = null;
}
Marshal.ReleaseComObject(videoPinFrom);
videoPinFrom = null;
result = true;
}
else
{
result = false;
}
DirectShowUtil.RemoveFilters(temp_graph, SplitterSource.Name);
Marshal.FinalReleaseComObject(sourceFilter);
}
catch
{ result = false; }
finally
{
Marshal.ReleaseComObject(temp_graph);
}
return(result);
}
