protected override void DoStopInternal(object state)
{
IFilterGraph graph = mediaControl as IFilterGraph;
if (graph != null)
{
if (mediaControl != null)
{
int hr = mediaControl.Stop();
DsError.ThrowExceptionForHR(hr);
mediaControl = null;
}
IEnumFilters pEnum = null;
if (COMHelper.SUCCEEDED(graph.EnumFilters(out pEnum)) && pEnum != null)
{
List <IBaseFilter> allFilters = new List <IBaseFilter>();
IBaseFilter[] aFilters = new IBaseFilter[1];
while (COMHelper.S_OK == pEnum.Next(1, aFilters, IntPtr.Zero))
{
allFilters.Add(aFilters[0]);
}
Marshal.ReleaseComObject(pEnum);
foreach (var f in allFilters)
{
if (f != null)
{
graph.RemoveFilter(f);
}
}
}
}
base.DoStopInternal(state);
}