+static av_always_inline int sad_wxh(const uint8_t *src1, ptrdiff_t stride1,
+                                    const uint8_t *src2, ptrdiff_t stride2,
+                                    int w, int h)
+{
+    int x, y, sum = 0;
+
+    for (y = 0; y < h; y++) {
+        for (x = 0; x < w; x++)
+            sum += abs(src1[x] - src2[x]);

minor: I came out of nowhere to this patch, but maybe FFABS? :)

+        src1 += stride1;
+        src2 += stride2;
+    }
+    return sum;
+}

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