+ * - Audio format handlers: \ref mp3_afh.c, \ref ogg_afh.c \ref aac_afh.c,
+ * - Decoders: \ref mp3dec.c, \ref \ref oggdec.c, \ref aacdec.c,
+ * - Volume normalizer: \ref compress.c,
+ * - Output: \ref alsa_write.c, \ref osx_write.c,
+ * - http: \ref http_recv.c, \ref http_send.c,
+ * - ortp: \ref ortp_recv.c, \ref ortp_send.c,
+ * - dccp: \ref dccp_recv.c, \ref dccp_send.c,
+ * - Audio file selector: \ref afs.c, \ref aft.c, \ref mood.c,
+ * - Afs structures: \ref afs_table, \ref audio_file_data,
+ * \ref afs_info \ref afh_info,
+ * - Afs tables: \ref aft.c, \ref mood.c, \ref playlist.c,
+ * \ref attribute.c, \ref score.c,
+ * - The virtual streaming system: \ref vss.c, \ref chunk_queue.c.
+ *
+ * Lower levels:
+ *
+ * - Scheduling: \ref sched.c, \ref sched.h,
+ * - Networking: \ref net.c,
+ * - File descriptors: \ref fd.c,
+ * - Signals: \ref signal.c,
+ * - Daemons: \ref daemon.c,
+ * - Strings: \ref string.c, \ref string.h,
+ * - Time: \ref time.c,
+ * - Spawning processes: \ref exec.c,
+ * - Inter process communication: \ref ipc.c,
+ * - The object storage layer: \ref osl.c,
+ * - Blob tables: \ref blob.c,
+ * - The error subssystem: \ref error.h.
+ *
+ * Low-level data structures:
+ *
+ * - Doubly linked lists: \ref list.h,
+ * - Red-black trees: \ref rbtree.h, \ref rbtree.c,
+ * - Ring buffer: \ref ringbuffer.c, \ref ringbuffer.h,
+ * - Hashing: \ref hash.h, \ref sha1.h, \ref sha1.c,
+ * - Crypto: \ref crypt.c.