* @param[out] header_len The sizes of each of the three headers.
* @return On error a negative value is returned, on success zero.
*/
-int avpriv_split_xiph_headers(uint8_t *extradata, int extradata_size,
+int avpriv_split_xiph_headers(const uint8_t *extradata, int extradata_size,
int first_header_size, uint8_t *header_start[3],
int header_len[3]);