mfplat: Fix media type compare logic regarding user data.

dlls/mfplat/mediatype.c

@@ -514,13 +514,14 @@ static HRESULT WINAPI mediatype_IsEqual(IMFMediaType *iface, IMFMediaType *type,
     PropVariantInit(&right.value);
     right.hr = IMFAttributes_GetItem(right.type, &MF_MT_USER_DATA, &right.value);
 
-    if (SUCCEEDED(left.hr) && SUCCEEDED(left.hr))
+    /* Compare user data if both types have it, otherwise simply check if both don't. */
+    if (SUCCEEDED(left.hr) && SUCCEEDED(right.hr))
     {
         result = FALSE;
         IMFAttributes_CompareItem(left.type, &MF_MT_USER_DATA, &left.value, &result);
     }
-    else if (FAILED(left.hr) && FAILED(left.hr))
-        result = TRUE;
+    else
+        result = FAILED(left.hr) && FAILED(right.hr);
 
     PropVariantClear(&left.value);
     PropVariantClear(&right.value);

dlls/mfplat/tests/mfplat.c

@@ -762,6 +762,19 @@ if(0)
     ok(flags == (MF_MEDIATYPE_EQUAL_MAJOR_TYPES | MF_MEDIATYPE_EQUAL_FORMAT_TYPES | MF_MEDIATYPE_EQUAL_FORMAT_DATA
             | MF_MEDIATYPE_EQUAL_FORMAT_USER_DATA), "Unexpected flags %#x.\n", flags);
 
+    /* Different user data. */
+    hr = IMFMediaType_SetBlob(mediatype, &MF_MT_USER_DATA, (const UINT8 *)&flags, sizeof(flags));
+    ok(hr == S_OK, "Failed to set attribute, hr %#x.\n", hr);
+
+    flags = 0;
+    hr = IMFMediaType_IsEqual(mediatype, mediatype2, &flags);
+    ok(hr == S_FALSE, "Unexpected hr %#x.\n", hr);
+    ok(flags == (MF_MEDIATYPE_EQUAL_MAJOR_TYPES | MF_MEDIATYPE_EQUAL_FORMAT_TYPES | MF_MEDIATYPE_EQUAL_FORMAT_DATA),
+            "Unexpected flags %#x.\n", flags);
+
+    hr = IMFMediaType_DeleteItem(mediatype, &MF_MT_USER_DATA);
+    ok(hr == S_OK, "Failed to delete item, hr %#x.\n", hr);
+
     hr = IMFMediaType_SetGUID(mediatype, &MF_MT_SUBTYPE, &MFVideoFormat_RGB32);
     ok(hr == S_OK, "Failed to set subtype, hr %#x.\n", hr);