[theora] ITheoraEncodeSettings C# interop

[Andrew Bisson]

My apologies if this is considered somewhat off-topic but I presume that
this information may be may also be of use to others using these
filters.
Is there someone with a better understanding of COM than I have who can
tell me where I'm going wrong with the following C# interface
definition?
I can set and recover a quality setting using this interface but not the
isUsingQualityMode flag.  Not sure why they should be different.

Thanks, 
Andy

using System.Runtime.InteropServices;
[ComVisible(true),
  ComImport,
  Guid("4F063B3A-B397-4c22-AFF4-2F8DB96D292A"),
  InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
public interface ITheoraEncodeSettings
{
  [PreserveSig]
  bool canModifySettings();
  [PreserveSig]
  ulong targetBitrate();
  [PreserveSig]
  ulong keyFrameDataBitrate();
  [PreserveSig]
  byte quality();
  [PreserveSig]
  long sharpness();
  [PreserveSig]
  long noiseSensitivity();
  [PreserveSig]
  ulong keyframeFreq();
  [PreserveSig]
  bool isFixedKeyframeInterval();
  [PreserveSig]
  bool allowDroppedFrames();
  [PreserveSig]
  bool isUsingQualityMode();
  [PreserveSig]
  bool isUsingQuickMode();
  [PreserveSig]
  ulong keyframeFreqMin();
  [PreserveSig]
  long keyframeAutoThreshold();

  [PreserveSig]
  bool setTargetBitrate([In] ulong inBitrate);
  [PreserveSig]
  bool setKeyframeDataBitrate([In] ulong inBitrate);
  [PreserveSig]
  bool setQuality([In] byte inQuality);
  [PreserveSig]
  bool setSharpness([In] long inSharpness);
  [PreserveSig]
  bool setNoiseSensitivity([In] long inNoiseSensitivity);
  [PreserveSig]
  bool setKeyframeFreq([In] ulong inKeyframeFreq);
  [PreserveSig]
  bool setIsFixedKeyframeInterval([In] bool inIsFixedKeyframeInterval);
  [PreserveSig]
  bool setAllowDroppedFrames([In] bool inAllowDroppedFrames);
  [PreserveSig]
  bool setIsUsingQualityMode([In] bool inIsUsingQualityMode);
  [PreserveSig]
  bool setIsUsingQuickMode([In] bool inIsUsingQuickMode);
  [PreserveSig]
  bool setKeyframeFreqMin([In] ulong inKeyframeFreqMin);
  [PreserveSig]
  bool setKeyframeAutoThreshold([In] long inKeyframeAutoThreshold);

  [PreserveSig]
  void setFlipImageVerticaly([In] bool flipImageVerticaly);
  [PreserveSig]
  bool getFlipImageVerticaly();
}


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