winegstreamer: Use MFCreateVideoMediaTypeFromSubtype in GetInputAvailableType.

dlls/winegstreamer/h264_decoder.c

@@ -392,27 +392,12 @@ static HRESULT WINAPI transform_AddInputStreams(IMFTransform *iface, DWORD strea
 static HRESULT WINAPI transform_GetInputAvailableType(IMFTransform *iface, DWORD id, DWORD index,
         IMFMediaType **type)
 {
-    IMFMediaType *media_type;
-    const GUID *subtype;
-    HRESULT hr;
-
     TRACE("iface %p, id %#lx, index %#lx, type %p.\n", iface, id, index, type);
 
     *type = NULL;
-
     if (index >= ARRAY_SIZE(h264_decoder_input_types))
         return MF_E_NO_MORE_TYPES;
-    subtype = h264_decoder_input_types[index];
-
-    if (FAILED(hr = MFCreateMediaType(&media_type)))
-        return hr;
-
-    if (SUCCEEDED(hr = IMFMediaType_SetGUID(media_type, &MF_MT_MAJOR_TYPE, &MFMediaType_Video)) &&
-            SUCCEEDED(hr = IMFMediaType_SetGUID(media_type, &MF_MT_SUBTYPE, subtype)))
-        IMFMediaType_AddRef((*type = media_type));
-
-    IMFMediaType_Release(media_type);
-    return hr;
+    return MFCreateVideoMediaTypeFromSubtype(h264_decoder_input_types[index], (IMFVideoMediaType **)type);
 }
 
 static HRESULT WINAPI transform_GetOutputAvailableType(IMFTransform *iface, DWORD id,