[PATCH 1/5] qedit: Mostly stubbed out implementation of SampleGrabber filter

[Nikolay Sivov]

On 2/2/2010 16:21, Paul Chitescu wrote:
> Changelog:
> 	qedit: Mostly stubbed out implementation of SampleGrabber filter
>
> Until the last patch component is applied most application will crash as they
> rarely check for errors.
>    

> +    if (IsEqualIID(riid,&IID_IUnknown) ||
> +        IsEqualIID(riid,&IID_IPersist) ||
> +        IsEqualIID(riid,&IID_IMediaFilter) ||
> +        IsEqualIID(riid,&IID_IBaseFilter)) {
> +        InterlockedIncrement(&This->refCount);
> +        *ppvObject =&(This->IBaseFilter_Vtbl);
> +        return S_OK;
> +    }
>    
You should use ISampleGrabber_AddRef() here on success to keep increment 
call in one place.
It's a common practice as far as i can see in Wine code.