mf/evr: Implement GetMediaTypeCount().

dlls/mf/evr.c

@@ -372,9 +372,14 @@ static HRESULT WINAPI video_stream_typehandler_IsMediaTypeSupported(IMFMediaType
 
 static HRESULT WINAPI video_stream_typehandler_GetMediaTypeCount(IMFMediaTypeHandler *iface, DWORD *count)
 {
-    FIXME("%p, %p.\n", iface, count);
+    TRACE("%p, %p.\n", iface, count);
 
-    return E_NOTIMPL;
+    if (!count)
+        return E_POINTER;
+
+    *count = 0;
+
+    return S_OK;
 }
 
 static HRESULT WINAPI video_stream_typehandler_GetMediaTypeByIndex(IMFMediaTypeHandler *iface, DWORD index,

dlls/mf/tests/mf.c

@@ -3296,6 +3296,15 @@ static void test_evr(void)
     ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
     ok(IsEqualGUID(&guid, &MFMediaType_Video), "Unexpected type %s.\n", wine_dbgstr_guid(&guid));
 
+    /* Supported types are not advertised. */
+    hr = IMFMediaTypeHandler_GetMediaTypeCount(type_handler, NULL);
+    ok(hr == E_POINTER, "Unexpected hr %#x.\n", hr);
+
+    count = 1;
+    hr = IMFMediaTypeHandler_GetMediaTypeCount(type_handler, &count);
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
+    ok(!count, "Unexpected count %u.\n", count);
+
     IMFMediaTypeHandler_Release(type_handler);
 
     /* Stream uses an allocator. */