119         if (this->vtbl)                                                      \
120             CoTaskMemFree(this->vtbl);                                       \
128     void  *vtbl = CoTaskMemAlloc(sizeof(*this->vtbl));                       \
130     if (!this || !vtbl)                                                      \
133     ZeroMemory(vtbl, sizeof(*this->vtbl));                                   \
135     this->vtbl = vtbl;                                                       \
146 #define SETVTBL(vtbl, prefix, fn) \  argument
147     do { (vtbl)->fn = (void *) ff_dshow_##prefix##_##fn; } while(0)
162     IPinVtbl *vtbl;  member
208     IEnumPinsVtbl *vtbl;  member
230     IEnumMediaTypesVtbl *vtbl;  member
251     IBaseFilterVtbl *vtbl;  member