quartz: Distinguish interface pointer and implementation pointer in multiple interfaces.

dlls/quartz/acmwrapper.c

@@ -394,7 +394,7 @@ HRESULT ACMWrapper_create(IUnknown * pUnkOuter, LPVOID * ppv)
     if (FAILED(hr))
         return hr;
 
-    *ppv = This;
+    *ppv = &This->tf.filter.IBaseFilter_iface;
     This->lasttime_real = This->lasttime_sent = -1;
 
     return hr;

dlls/quartz/avidec.c

@@ -416,7 +416,7 @@ HRESULT AVIDec_create(IUnknown * pUnkOuter, LPVOID * ppv)
     This->pBihIn = NULL;
     This->pBihOut = NULL;
 
-    *ppv = This;
+    *ppv = &This->tf.filter.IBaseFilter_iface;
 
     return hr;
 }

dlls/quartz/filesource.c

@@ -452,13 +452,13 @@ static HRESULT WINAPI AsyncReader_QueryInterface(IBaseFilter * iface, REFIID rii
     *ppv = NULL;
 
     if (IsEqualIID(riid, &IID_IUnknown))
-        *ppv = This;
+        *ppv = &This->filter.IBaseFilter_iface;
     else if (IsEqualIID(riid, &IID_IPersist))
-        *ppv = This;
+        *ppv = &This->filter.IBaseFilter_iface;
     else if (IsEqualIID(riid, &IID_IMediaFilter))
-        *ppv = This;
+        *ppv = &This->filter.IBaseFilter_iface;
     else if (IsEqualIID(riid, &IID_IBaseFilter))
-        *ppv = This;
+        *ppv = &This->filter.IBaseFilter_iface;
     else if (IsEqualIID(riid, &IID_IFileSourceFilter))
         *ppv = &This->IFileSourceFilter_iface;
     else if (IsEqualIID(riid, &IID_IAMFilterMiscFlags))

dlls/quartz/memallocator.c

@@ -116,9 +116,9 @@ static HRESULT WINAPI BaseMemAllocator_QueryInterface(IMemAllocator * iface, REF
     *ppv = NULL;
 
     if (IsEqualIID(riid, &IID_IUnknown))
-        *ppv = This;
+        *ppv = &This->IMemAllocator_iface;
     else if (IsEqualIID(riid, &IID_IMemAllocator))
-        *ppv = This;
+        *ppv = &This->IMemAllocator_iface;
 
     if (*ppv)
     {