/// <summary>
/// Queries the underlying Sink Writer object.
/// </summary>
/// <param name="captureSink">A valid IMFCaptureSink instance.</param>
/// <param name="sinkStreamIndex">The zero-based index of the streamIndex to query. The index is returned in the sinkStreamIndex parameter of the <see cref="IMFCaptureSink.AddStream"/> method.</param>
/// <param name="sourceReader">Receives an instance of the underlying Sink Writer.</param>
/// <returns>If this function succeeds, it returns the S_OK member. Otherwise, it returns another HResult's member that describe the error.</returns>
public static HResult GetService(this IMFCaptureSink captureSink, int sinkStreamIndex, out IMFSinkWriter sinkWriter)
{
if (captureSink == null)
{
throw new ArgumentNullException("captureSink");
}
object tmp;
HResult hr = captureSink.GetService(sinkStreamIndex, Guid.Empty, typeof(IMFSinkWriterExtensions).GUID, out tmp);
sinkWriter = hr.Succeeded() ? tmp as IMFSinkWriter : null;
return(hr);
}
