DECLARE_INTERFACE_(IDeviceTopology, IUnknown)
{
    // 获取设备的连接器数量
    STDMETHOD(GetConnectorCount)(THIS_
        _Out_  UINT *pConnectorCount
    ) PURE;

    // 获取连接器
    STDMETHOD(GetConnector)(THIS_
        _In_   UINT nIndex,
        _Out_  IConnector **ppConnector
    ) PURE;

    // 获取连接器的部件
    STDMETHOD(GetSubunit)(THIS_
        _In_   UINT nIndex,
        _Out_  IPart **ppSubunit
    ) PURE;

    // 获取默认的音频路径
    STDMETHOD(GetDefaultAudioPath)(THIS_
        _In_   ERole role,
        _In_   UINT deviceType,
        _Out_  IAudioPath **ppAudioPath
    ) PURE;

    // 获取设备的部件数量
    STDMETHOD(GetPartCount)(THIS_
        _Out_  UINT *pPartCount
    ) PURE;

    // 获取设备的部件
    STDMETHOD(GetPart)(THIS_
        _In_   UINT nIndex,
        _Out_  IPart **ppPart
    ) PURE;

    // 获取设备的拓扑结构
    STDMETHOD(GetDeviceId)(THIS_
        _Outptr_result_maybenull_  LPWSTR *ppwstrDeviceId
    ) PURE;

    // 获取设备的数据流方向
    STDMETHOD(GetSignalPath)(THIS_
        _In_   IPart *ppIPartFrom,
        _In_   IPart *ppIPartTo,
        _In_   DWORD dwFlags,
        _Out_  IConnection **ppIConnection
    ) PURE;

    // 获取默认的数据流方向
    STDMETHOD(GetAudioLoudness)(THIS_
        _In_   DWORD dwDeviceId,
        _Out_  BOOL *pbEnabled
    ) PURE;

    // 设置默认的数据流方向
    STDMETHOD(SetAudioLoudness)(THIS_
        _In_   DWORD dwDeviceId,
        _In_   BOOL bEnable
    ) PURE;

    // 获取设备的音频线路属性
    STDMETHOD(GetAudioLoudnessStep)(THIS_
        _In_   DWORD dwDeviceId,
        _Out_  BOOL *pbEnabled
    ) PURE;

    // 设置设备的音频线路属性
    STDMETHOD(SetAudioLoudnessStep)(THIS_
        _In_   DWORD dwDeviceId,
        _In_   BOOL bEnable
    ) PURE;
};