+/**
+ * search for the position and the length of the decoder configuration
+ *
+ * \param buf buffer to seach
+ * \param buflen length of \a buf
+ * \param skip Upon succesful return, this contains the offset in \a buf where
+ * the decoder config starts.
+ * \param decoder_length result pointer that is filled in with the length of
+ * the decoder configuration on success.
+ *
+ * \return positive on success, negative on errors
+ */
+int aac_find_esds(unsigned char *buf, size_t buflen, size_t *skip,
+ unsigned long *decoder_length)