const char *audio_format_name(int);
void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
void *map, const char **buf, size_t *len);
+int32_t afh_get_start_chunk(int32_t approx_chunk_num,
+ const struct afh_info *afhi);
void afh_get_header(struct afh_info *afhi, uint8_t audio_format_id,
void *map, size_t mapsize, char **buf, size_t *len);
void afh_free_header(char *header_buf, uint8_t audio_format_id);