Method QueryInterface

libavdevice/decklink_enc.cpp:118–131

        return S_OK;
    }
    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID riid, LPVOID *ppv)
    {
        if (DECKLINK_IsEqualIID(riid, IID_IUnknown)) {
            *ppv = static_cast<IUnknown*>(this);
        } else if (DECKLINK_IsEqualIID(riid, IID_IDeckLinkVideoFrame_v14_2_1)) {
            *ppv = static_cast<IDeckLinkVideoFrame_v14_2_1*>(this);
        } else {
            *ppv = NULL;
            return E_NOINTERFACE;
        }

        AddRef();
        return S_OK;
    }
    virtual ULONG   STDMETHODCALLTYPE AddRef(void)                            { return ++_refs; }
    virtual ULONG   STDMETHODCALLTYPE Release(void)
    {