Method QueryInterface

libavdevice/decklink_dec.cpp:136–149

        // IUnknown methods
        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_IDeckLinkMemoryAllocator_v14_2_1)) {
                *ppv = static_cast<IDeckLinkMemoryAllocator_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)