+/**
+ * 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.
+ *
+ * \return The length of the decoder configuration
+ */
+ssize_t aac_find_esds(unsigned char *buf, size_t buflen, size_t *skip)