protected void ClearDesiredSampleTime(IMFSample pSample)
{
if (pSample == null)
{
throw new COMException("ClearDesiredSampleTime", E_Pointer);
}
IMFDesiredSample pDesired = null;
object pUnkSwapChain = null;
// We store some custom attributes on the sample, so we need to cache them
// and reset them.
//
// This works around the fact that IMFDesiredSample::Clear() removes all of the
// attributes from the sample.
int counter;
int hr;
hr = pSample.GetUINT32(MFSamplePresenter_SampleCounter, out counter);
MFError.ThrowExceptionForHR(hr);
try
{
Guid IID_IUnknown = new Guid("00000000-0000-0000-C000-000000000046");
hr = pSample.GetUnknown(MFSamplePresenter_SampleSwapChain, IID_IUnknown, out pUnkSwapChain);
MFError.ThrowExceptionForHR(hr);
}
catch { }
pDesired = (IMFDesiredSample)pSample;
pDesired.Clear();
hr = pSample.SetUINT32(MFSamplePresenter_SampleCounter, counter);
MFError.ThrowExceptionForHR(hr);
if (pUnkSwapChain != null)
{
hr = pSample.SetUnknown(MFSamplePresenter_SampleSwapChain, pUnkSwapChain);
MFError.ThrowExceptionForHR(hr);
}
SafeRelease(pUnkSwapChain);
//SafeRelease(pDesired);
}
