extern const char *audio_formats[];
#define DEFINE_AUDIO_FORMAT_ARRAY const char *audio_formats[] = {"mp3", "ogg", "aac", NULL}
#define MAX_STREAM_SLOTS 5
+/**
+ * the possible modes of operation
+ *
+ * - off: disconnect from para_server
+ * - on: receive status information from para_server and play the audio stream
+ * - sb: only receive status information but not the audio stream
+*/
+enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
+/**
+ * describes one instance of a receiver-filter-writer chain
+ *
+ * \sa receier_node, receiver, filter, filter_node, filter_chain, writer,
+ * writer_node, writer_node_group.
+ */
+struct slot_info {
+ /** number of the audio format in this slot */
+ int format;
+ /** writer start time */
+ struct timeval wstime;
+ /** the receiver info associated with this slot */
+ struct receiver_node *receiver_node;
+ /** the active filter chain */
+ struct filter_chain *fc;
+ /** the active writer node group */
+ struct writer_node_group *wng;
+};
+
+/**
+ * the main task of audiod
+ *
+ * \sa struct task, struct sched
+ */
+struct audiod_task {
+ struct timeval *now;
+ struct task task;
+};
+
+/**
+ * the task for audiod's child (para_client stat)
+ *
+ * \sa struct task, struct sched
+ */
+struct status_task {
+ /** the associated task structure of audiod */
+ struct task task;
+ struct private_client_data *pcd;
+ /** the array of status items sent by para_server */
+ char *stat_item_values[NUM_STAT_ITEMS];
+ /** do not restart client command until this time */
+ struct timeval restart_barrier;
+ /** the offset value announced by para_server */
+ int offset_seconds;
+ /** the length of the current audio file as announced by para_server */
+ int length_seconds;
+ /** the start of the current stream from the view of para_server */
+ struct timeval server_stream_start;
+ /** the averaged time deviation between para_server and para_audiod */
+ struct timeval sa_time_diff;
+ /** whether client time is ahead of server time */
+ int sa_time_diff_sign;
+ /** the audio format announced in server status */
+ char *af_status;
+ /** non-zero if \a af_status is "playing" */
+ int playing;
+};
+
+extern struct status_task *stat_task;
+extern struct slot_info slot[MAX_STREAM_SLOTS];
+extern struct audiod_args_info conf;
+extern int audiod_status;
+extern const char *status_item_list[NUM_STAT_ITEMS];
+
+void __noreturn clean_exit(int status, const char *msg);
+int handle_connect(int accept_fd);
+void audiod_status_dump(void);
+void dump_empty_status(void);
+
+/** iterate over all slots */
+#define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)