public int BeginCreateObject(
IMFByteStream pByteStream,
string pwszURL,
MFResolution dwFlags,
IPropertyStore pProps, // Can be NULL.
out object ppIUnknownCancelCookie, // Can be NULL.
IMFAsyncCallback pCallback,
object punkState // Can be NULL
)
{
// Make sure we *never* leave this entry point with an exception
try
{
int hr;
m_Log.WriteLine("BeginCreateObject");
ppIUnknownCancelCookie = null; // We don't return a cancellation cookie.
if ((pByteStream == null) || (pwszURL == null) || (pCallback == null))
{
throw new COMException("bad stream, url, or callback", E_InvalidArgument);
}
IMFAsyncResult pResult = null;
WavSource pSource = new WavSource();
pSource.Open(pByteStream);
hr = MFExtern.MFCreateAsyncResult(pSource as IMFMediaSource, pCallback, punkState, out pResult);
MFError.ThrowExceptionForHR(hr);
hr = MFExtern.MFInvokeCallback(pResult);
MFError.ThrowExceptionForHR(hr);
if (pResult != null)
{
Marshal.ReleaseComObject(pResult);
}
return S_Ok;
}
catch (Exception e)
{
ppIUnknownCancelCookie = null;
return Marshal.GetHRForException(e);
}
}
