public static Graph BuildFilterGraphForFiles(String[] fileNames)
{
IGraphBuilder builder = CreateGraphBuilder();
int hr;
foreach (String fileName in fileNames)
{
hr = builder.RenderFile(fileName, null);
DsError.ThrowExceptionForHR(hr);
}
IEnumFilters filtersEnum;
hr = builder.EnumFilters(out filtersEnum);
DsError.ThrowExceptionForHR(hr);
IBaseFilter[] filters = new IBaseFilter[1];
IntPtr count = Marshal.AllocCoTaskMem(Marshal.SizeOf(typeof(ulong)));
try
{
Graph graph = new Graph();
while ((hr = filtersEnum.Next(1, filters, count)) == 0)
{
IBaseFilter filter = filters[0];
graph.AddFilter(new Filter(graph, filter));
}
return graph;
}
finally
{
Marshal.FreeCoTaskMem(count);
count = IntPtr.Zero;
}
}
internal Filter(Graph graph, IBaseFilter filter)
{
_graph = graph;
_filter = filter;
_fileSourceFilter = filter as IFileSourceFilter;
}