{
        [PreserveSig]
        int GetVideoAcceleratorGUIDs([Out] out int pdwNumGuidsSupported,
            [In, Out] Guid [] pGuidsSupported);

        [PreserveSig]
        int GetUncompFormatsSupported( [In, MarshalAs(UnmanagedType.LPStruct)] Guid pGuid,
            [Out] out int pdwNumFormatsSupported,
            [Out] out DDPixelFormat pFormatsSupported);

        [PreserveSig]
        int GetInternalMemInfo([In, MarshalAs(UnmanagedType.LPStruct)] Guid pGuid,
            [In] AMVAUncompDataInfo pamvaUncompDataInfo,
            [Out] out AMVAInternalMemInfo pamvaInternalMemInfo);

        [PreserveSig]
        int GetCompBufferInfo([In, MarshalAs(UnmanagedType.LPStruct)] Guid pGuid,
            [In] AMVAUncompDataInfo pamvaUncompDataInfo,
            [In, Out] int pdwNumTypesCompBuffers,
            [Out] out AMVACompBufferInfo pamvaCompBufferInfo);

        [PreserveSig]
        int GetInternalCompBufferInfo([Out] out int pdwNumTypesCompBuffers,
            [Out] out AMVACompBufferInfo pamvaCompBufferInfo);

        [PreserveSig]
        int BeginFrame([In] AMVABeginFrameInfo amvaBeginFrameInfo);

        [PreserveSig]
        int EndFrame([In] AMVAEndFrameInfo pEndFrameInfo);

        [PreserveSig]
        int GetBuffer(
            [In] int dwTypeIndex,
            [In] int dwBufferIndex,
            [In, MarshalAs(UnmanagedType.Bool)] bool bReadOnly,
            [Out] IntPtr ppBuffer, // LPVOID
            [Out] out int lpStride);

        [PreserveSig]
        int ReleaseBuffer([In] int dwTypeIndex,
            [In] int dwBufferIndex);

        [PreserveSig]
        int Execute(
            [In] int dwFunction,
            [In] IntPtr lpPrivateInputData, // LPVOID
            [In] int cbPrivateInputData,
            [In] IntPtr lpPrivateOutputDat, // LPVOID
            [In] int cbPrivateOutputData,
            [In] int dwNumBuffers,
            [In] AMVABufferInfo pamvaBufferInfo);

        [PreserveSig]
        int QueryRenderStatus([In] int dwTypeIndex,
            [In] int dwBufferIndex,
            [In] int dwFlags);

        [PreserveSig]
        int DisplayFrame([In] int dwFlipToIndex,
            [In] IMediaSample pMediaSample);
    }

    [ComImport,
    Guid("56a868fd-0ad4-11ce-b0a3-0020af0ba770"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IAMFilterGraphCallback
    {
        [PreserveSig]
        int UnableToRender(IPin pPin);
    }

    [ComImport,
    Guid("AB6B4AFE-F6E4-11d0-900D-00C04FD9189D"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IDirectDrawMediaSample
    {
        [PreserveSig]
        int GetSurfaceAndReleaseLock(
            [MarshalAs(UnmanagedType.IUnknown)] out object ppDirectDrawSurface, // IDirectDrawSurface
            out Rectangle pRect);

        [PreserveSig]
        int LockMediaSamplePointer();
    }

    [ComImport,
    Guid("AB6B4AFC-F6E4-11d0-900D-00C04FD9189D"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IDirectDrawMediaSampleAllocator
    {
        [PreserveSig]
        int GetDirectDraw(
            [MarshalAs(UnmanagedType.IUnknown)] out object ppDirectDraw); // IDirectDraw

    }

#endif

    [ComImport,
    Guid("45086030-F7E4-486a-B504-826BB5792A3B"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IConfigAsfWriter
    {
        [PreserveSig,
        Obsolete("This method is now obsolete because it assumes version 4.0 Windows Media Format SDK profiles. Use GetCurrentProfile or GetCurrentProfileGuid instead to correctly identify a profile.", false)]
        int ConfigureFilterUsingProfileId([In] int dwProfileId);

        [PreserveSig,
        Obsolete("This method is now obsolete because it assumes version 4.0 Windows Media Format SDK profiles. Use GetCurrentProfile or GetCurrentProfileGuid instead to correctly identify a profile.", false)]
        int GetCurrentProfileId([Out] out int pdwProfileId);

        [PreserveSig,
        Obsolete("Using Guids is considered obsolete by MS.  The preferred approach is using an IWMProfile.  See ConfigureFilterUsingProfile", false)]
        int ConfigureFilterUsingProfileGuid([In, MarshalAs(UnmanagedType.LPStruct)] Guid guidProfile);

        [PreserveSig,
        Obsolete("Using Guids is considered obsolete by MS.  The preferred approach is using an IWMProfile.  See GetCurrentProfile", false)]
        int GetCurrentProfileGuid([Out] out Guid pProfileGuid);

        [PreserveSig,
        Obsolete("This method requires IWMProfile, which in turn requires several other interfaces.  Rather than duplicate all those interfaces here, it is recommended that you use the WindowsMediaLib from http://DirectShowNet.SourceForge.net", false)]
        int ConfigureFilterUsingProfile([In] IntPtr pProfile);

        [PreserveSig,
        Obsolete("This method requires IWMProfile, which in turn requires several other interfaces.  Rather than duplicate all those interfaces here, it is recommended that you use the WindowsMediaLib from http://DirectShowNet.SourceForge.net", false)]
        int GetCurrentProfile([Out] out IntPtr ppProfile);

        [PreserveSig]
        int SetIndexMode([In, MarshalAs(UnmanagedType.Bool)] bool bIndexFile);

        [PreserveSig]
        int GetIndexMode([Out, MarshalAs(UnmanagedType.Bool)] out bool pbIndexFile);
    }

    [ComImport,
    Guid("546F4260-D53E-11cf-B3F0-00AA003761C5"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IAMDirectSound
    {
        [PreserveSig]
        int GetDirectSoundInterface([MarshalAs(UnmanagedType.IUnknown)] out object lplpds); // IDirectSound

        [PreserveSig]
        int GetPrimaryBufferInterface([MarshalAs(UnmanagedType.IUnknown)] out object lplpdsb); // IDirectSoundBuffer

        [PreserveSig]
        int GetSecondaryBufferInterface([MarshalAs(UnmanagedType.IUnknown)] out object lplpdsb); // IDirectSoundBuffer

        [PreserveSig]
        int ReleaseDirectSoundInterface([MarshalAs(UnmanagedType.IUnknown)] object lpds); // IDirectSound

        [PreserveSig]
        int ReleasePrimaryBufferInterface([MarshalAs(UnmanagedType.IUnknown)] object lpdsb); // IDirectSoundBuffer

        [PreserveSig]
        int ReleaseSecondaryBufferInterface([MarshalAs(UnmanagedType.IUnknown)] object lpdsb); // IDirectSoundBuffer

        [PreserveSig]
        int SetFocusWindow(IntPtr hWnd, [In, MarshalAs(UnmanagedType.Bool)] bool bSet);

        [PreserveSig]
        int GetFocusWindow(out IntPtr hWnd, [Out, MarshalAs(UnmanagedType.Bool)] out bool bSet);
    }

    [ComImport,
    Guid("C056DE21-75C2-11d3-A184-00105AEF9F33"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IAMWstDecoder
    {
        [PreserveSig]
        int GetDecoderLevel(out WSTLevel lpLevel);

        [PreserveSig]
        int GetCurrentService(out WSTService lpService);

        [PreserveSig]
        int GetServiceState(out WSTState lpState);

        [PreserveSig]
        int SetServiceState(WSTState State);

        [PreserveSig]
        int GetOutputFormat([MarshalAs(UnmanagedType.LPStruct)] BitmapInfoHeader lpbmih);

        [PreserveSig]
        int SetOutputFormat(BitmapInfoHeader lpbmi);

        [PreserveSig]
        int GetBackgroundColor(out int pdwPhysColor);

        [PreserveSig]
        int SetBackgroundColor(int dwPhysColor);

        [PreserveSig]
        int GetRedrawAlways([MarshalAs(UnmanagedType.Bool)] out bool lpbOption);

        [PreserveSig]
        int SetRedrawAlways([MarshalAs(UnmanagedType.Bool)] bool bOption);

        [PreserveSig]
        int GetDrawBackgroundMode(out WSTDrawBGMode lpMode);

        [PreserveSig]
        int SetDrawBackgroundMode(WSTDrawBGMode Mode);

        [PreserveSig]
        int SetAnswerMode([MarshalAs(UnmanagedType.Bool)] bool bAnswer);

        [PreserveSig]
        int GetAnswerMode([MarshalAs(UnmanagedType.Bool)] out bool pbAnswer);

        [PreserveSig]
        int SetHoldPage([MarshalAs(UnmanagedType.Bool)] bool bHoldPage);

        [PreserveSig]
        int GetHoldPage([MarshalAs(UnmanagedType.Bool)] out bool pbHoldPage);

        [PreserveSig]
        int GetCurrentPage([In, Out] WSTPage pWstPage);

        [PreserveSig]
        int SetCurrentPage([In] WSTPage WstPage);
    }

    [ComImport,
    Guid("b45dd570-3c77-11d1-abe1-00a0c905f375"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IMpegAudioDecoder
    {
        [PreserveSig]
        int get_FrequencyDivider(
            out MPEGAudioDivider pDivider
            );

        [PreserveSig]
        int put_FrequencyDivider(
            MPEGAudioDivider Divider
            );

        [PreserveSig]
        int get_DecoderAccuracy(
            out MPEGAudioAccuracy pAccuracy
            );

        [PreserveSig]
        int put_DecoderAccuracy(
            MPEGAudioAccuracy Accuracy
            );

        [PreserveSig]
        int get_Stereo(
            out MPEGAudioChannels pStereo
            );

        [PreserveSig]
        int put_Stereo(
            MPEGAudioChannels Stereo
            );

        [PreserveSig]
        int get_DecoderWordSize(
            out int pWordSize
            );

        [PreserveSig]
        int put_DecoderWordSize(
            int WordSize
            );

        [PreserveSig]
        int get_IntegerDecode(
            out int pIntDecode
            );

        [PreserveSig]
        int put_IntegerDecode(
            int IntDecode
            );

        [PreserveSig]
        int get_DualMode(
            out MPEGAudioDual pIntDecode
            );

        [PreserveSig]
        int put_DualMode(
            MPEGAudioDual IntDecode
            );

        [PreserveSig]
        int get_AudioFormat(
            out MPEG1WaveFormat lpFmt
            );
    }

    [ComImport,
    Guid("6d5140c1-7436-11ce-8034-00aa006009fa"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IServiceProvider
    {
        int QueryService(
            [In, MarshalAs(UnmanagedType.LPStruct)] DsGuid guidService,
            [In, MarshalAs(UnmanagedType.LPStruct)] DsGuid riid,
            [MarshalAs(UnmanagedType.IUnknown)] out object ppvObject
            );
    }

    [ComImport,
    Guid("FC4801A3-2BA9-11CF-A229-00AA003D7352"),
    InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    public interface IObjectWithSite
    {
        [PreserveSig]
        int SetSite(
            [In, MarshalAs(UnmanagedType.IUnknown)] object pUnkSite
            );

        [PreserveSig]
        int GetSite(
            [In, MarshalAs(UnmanagedType.LPStruct)] DsGuid riid,
            [MarshalAs(UnmanagedType.IUnknown)] out object ppvSite
            );
    }

    #endregion
}