/// <summary>
/// Test the PreRoll function
/// </summary>
void TestPreRoll()
{
int hr;
long pllPreroll;
hr = m_ims.GetPreroll(out pllPreroll);
//Marshal.ThrowExceptionForHR(hr);
// E_NOTIMPL for AsyncReader
Debug.Assert(hr == -2147467263, "GetPreRoll");
}