/// <summary>
/// 指定したフィルタから指定した条件を満たすピンを探し、最初に見つかったピンを返す。
/// </summary>
/// <param name="filter">フィルタ</param>
/// <param name="pred">条件</param>
/// <returns>最初に見つかったピン</returns>
public static IPin FindPin(IBaseFilter filter, Predicate <IPin> pred)
{
IPin result = null;
IEnumPins enumerator = null;
try
{
filter.EnumPins(out enumerator);
enumerator.Reset();
IPin pin = null;
try
{
while (enumerator.Next(1, out pin, IntPtr.Zero) == S_OK)
{
if (pin != null)
{
if (pred(pin))
{
result = pin;
pin = null;
break;
}
Marshal.ReleaseComObject(pin);
pin = null;
}
}
}
finally
{
if (pin != null)
{
Marshal.ReleaseComObject(pin);
}
}
}
finally
{
if (enumerator != null)
{
Marshal.ReleaseComObject(enumerator);
}
enumerator = null;
}
return(result);
}
public void TestReset()
{
int hr;
IPin[] pPins = new IPin[1];
IEnumPins ppEnum = GetTestEnum();
hr = ppEnum.Next(1, pPins, IntPtr.Zero);
DsError.ThrowExceptionForHR(hr);
hr = ppEnum.Reset();
DsError.ThrowExceptionForHR(hr);
hr = ppEnum.Next(1, pPins, IntPtr.Zero);
DsError.ThrowExceptionForHR(hr);
Marshal.ReleaseComObject(ppEnum);
}
/// <inheritdoc />
public IEnumerable <Pin> GetPins()
{
IEnumPins pins = null;
try
{
var hr = Object.EnumPins(out pins);
DsError.ThrowExceptionForHR(hr);
hr = pins.Reset();
DsError.ThrowExceptionForHR(hr);
var pin = new IPin[1];
while (pins.Next(1, pin, out _) == 0)
{
yield return(new Pin(pin[0]));
}
}
finally
{
if (pins != null)
{
Marshal.ReleaseComObject(pins);
}
}
}
// Tear down everything downstream of a given filter
public static int NukeDownstream(IFilterGraph graph, IBaseFilter filter)
{
if (filter == null)
{
return(WinAPI.E_FAIL);
}
IEnumPins enumPins = null;
IPin[] pins = new IPin[1] {
null
};
try
{
int hr = filter.EnumPins(out enumPins);
DsError.ThrowExceptionForHR(hr);
enumPins.Reset(); // start at the first pin
while (enumPins.Next(1, pins, IntPtr.Zero) == 0)
{
if (pins[0] != null)
{
PinDirection pindir;
pins[0].QueryDirection(out pindir);
if (pindir == PinDirection.Output)
{
IPin pTo = null;
pins[0].ConnectedTo(out pTo);
if (pTo != null)
{
PinInfo pi;
hr = pTo.QueryPinInfo(out pi);
if (hr == 0)
{
NukeDownstream(graph, pi.filter);
graph.Disconnect(pTo);
graph.Disconnect(pins[0]);
graph.RemoveFilter(pi.filter);
Util.ReleaseComObject(ref pi.filter);
DsUtils.FreePinInfo(pi);
}
Marshal.ReleaseComObject(pTo);
}
}
Marshal.ReleaseComObject(pins[0]);
}
}
return(0);
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine(ex.ToString());
}
finally
{
Marshal.ReleaseComObject(enumPins);
}
return(WinAPI.E_FAIL);
}