-int ff_pix_sum16_sse2(uint8_t *pix, int line_size);
-int ff_pix_sum16_xop(uint8_t *pix, int line_size);
-int ff_pix_norm1_sse2(uint8_t *pix, int line_size);
+int ff_pix_sum16_sse2(const uint8_t *pix, int line_size);
+int ff_pix_sum16_xop(const uint8_t *pix, int line_size);
+int ff_pix_norm1_sse2(const uint8_t *pix, int line_size);