/// <summary> Retrieve the friendly name of a connectorType. </summary>
private string GetName(IPin pin)
{
string str = "Unknown pin";
PinInfo pinInfo = new PinInfo();
// Direction matches, so add pin name to listbox
int errorCode = pin.QueryPinInfo(out pinInfo);
if (errorCode == 0)
{
str = pinInfo.name ?? "";
}
else
{
Marshal.ThrowExceptionForHR(errorCode);
}
// The pininfo structure contains a reference to an IBaseFilter,
// so you must release its reference to prevent resource a leak.
if (pinInfo.filter != null)
{
Marshal.ReleaseComObject(pinInfo.filter);
}
pinInfo.filter = null;
return str;
}
/// <summary>
/// Removes all filters downstream from a filter from the graph.
/// This is called only by derenderGraph() to remove everything
/// from the graph except the devices and compressors. The parameter
/// "removeFirstFilter" is used to keep a compressor (that should
/// be immediately downstream of the device) if one is begin used.
/// </summary>
protected void removeDownstream(IBaseFilter filter, bool removeFirstFilter)
{
// Get a pin enumerator off the filter
IEnumPins pinEnum;
int hr = filter.EnumPins(out pinEnum);
pinEnum.Reset();
if ((hr == 0) && (pinEnum != null))
{
// Loop through each pin
IPin[] pins = new IPin[1];
int f;
do
{
// Get the next pin
hr = pinEnum.Next(1, pins, out f);
if ((hr == 0) && (pins[0] != null))
{
// Get the pin it is connected to
IPin pinTo = null;
pins[0].ConnectedTo(out pinTo);
if (pinTo != null)
{
// Is this an input pin?
PinInfo info = new PinInfo();
hr = pinTo.QueryPinInfo(out info);
if ((hr == 0) && (info.dir == (PinDirection.Input)))
{
// Recurse down this branch
removeDownstream(info.filter, true);
// Disconnect
graphBuilder.Disconnect(pinTo);
graphBuilder.Disconnect(pins[0]);
// Remove this filter
// but don't remove the video or audio compressors
if ((info.filter != videoCompressorFilter) &&
(info.filter != audioCompressorFilter))
graphBuilder.RemoveFilter(info.filter);
}
Marshal.ReleaseComObject(info.filter);
Marshal.ReleaseComObject(pinTo);
}
Marshal.ReleaseComObject(pins[0]);
}
}
while (hr == 0);
Marshal.ReleaseComObject(pinEnum); pinEnum = null;
}
}