private string getName(IPin pin)
{
string str = "Unknown pin";
PinInfo pInfo = new PinInfo();
int errorCode = pin.QueryPinInfo(out pInfo);
if (errorCode == 0)
{
str = pInfo.name ?? "";
}
else
{
Marshal.ThrowExceptionForHR(errorCode);
}
if (pInfo.filter != null)
{
Marshal.ReleaseComObject(pInfo.filter);
}
pInfo.filter = null;
return str;
}
// --------------------------- Private methods ----------------------------
/// <summary> Retrieve the friendly name of a connectorType. </summary>
private string getName( IPin pin )
{
string s = "Unknown pin";
PinInfo pinInfo = new PinInfo();
// Direction matches, so add pin name to listbox
int hr = pin.QueryPinInfo( out pinInfo);
if ( hr == 0 )
{
s = pinInfo.name + "";
}
else
Marshal.ThrowExceptionForHR( hr );
// 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( s );
}
protected void removeDownstream(IBaseFilter filter, bool removeFirstFilter)
{
IEnumPins pins;
int num = filter.EnumPins(out pins);
pins.Reset();
if ((num == 0) && (pins != null))
{
IPin[] ppPins = new IPin[1];
do
{
int num2;
num = pins.Next(1, ppPins, out num2);
if ((num == 0) && (ppPins[0] != null))
{
IPin ppPin = null;
ppPins[0].ConnectedTo(out ppPin);
if (ppPin != null)
{
PinInfo pInfo = new PinInfo();
num = ppPin.QueryPinInfo(out pInfo);
if ((num == 0) && (pInfo.dir == PinDirection.Input))
{
this.removeDownstream(pInfo.filter, true);
this.graphBuilder.Disconnect(ppPin);
this.graphBuilder.Disconnect(ppPins[0]);
if ((pInfo.filter != this.videoCompressorFilter) && (pInfo.filter != this.audioCompressorFilter))
{
this.graphBuilder.RemoveFilter(pInfo.filter);
}
}
Marshal.ReleaseComObject(pInfo.filter);
Marshal.ReleaseComObject(ppPin);
}
Marshal.ReleaseComObject(ppPins[0]);
}
}
while (num == 0);
Marshal.ReleaseComObject(pins);
pins = null;
}
}
/// <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;
}
}
