audiod.h

   1 /** \file audiod.h symbols exported from audiod.c */
   2 int num_filters(int audio_format_num);
   3 int get_audio_format_num(char *name);
   4
   5 /** enum of audio formats supported by para_audiod */
   6 enum {AUDIOD_AUDIO_FORMATS_ENUM};
   7
   8 /** array of audio format names supported by para_audiod */
   9 extern const char *audio_formats[];
  10
  11 /** maximal number of simultaneous instances */
  12 #define MAX_STREAM_SLOTS 5
  13
  14 /**
  15  * the possible modes of operation
  16  *
  17  * - off: disconnect from para_server
  18  * - on: receive status information from para_server and play the audio stream
  19  * - sb: only receive status information but not the audio stream
  20 */
  21 enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
  22
  23 /**
  24  * describes one instance of a receiver-filter-writer chain
  25  *
  26  * \sa receier_node, receiver, filter, filter_node, filter_chain, writer,
  27  * writer_node, writer_node_group.
  28   */
  29 struct slot_info {
  30         /** number of the audio format in this slot */
  31         int format;
  32         /** writer start time */
  33         struct timeval wstime;
  34         /** the receiver info associated with this slot */
  35         struct receiver_node *receiver_node;
  36         /** the active filter chain */
  37         struct filter_chain *fc;
  38         /** the active writer node group */
  39         struct writer_node_group *wng;
  40 };
  41
  42 /**
  43  * the main task of audiod
  44  *
  45  * \sa struct task, struct sched
  46  */
  47 struct audiod_task {
  48         struct timeval *now;
  49         struct task task;
  50 };
  51
  52 /**
  53  * the task for obtaining para_server's status (para_client stat)
  54  *
  55  * \sa struct task, struct sched
  56  */
  57 struct status_task {
  58         /** the associated task structure of audiod */
  59         struct task task;
  60         /** client data associated with the stat task */
  61         struct private_client_data *pcd;
  62         /** the array of status items sent by para_server */
  63         char *stat_item_values[NUM_STAT_ITEMS];
  64         /** do not restart client command until this time */
  65         struct timeval restart_barrier;
  66         /** last time we received status data from para_server */
  67         struct timeval last_status_read;
  68         /** the offset value announced by para_server */
  69         int offset_seconds;
  70         /** the length of the current audio file as announced by para_server */
  71         int length_seconds;
  72         /** the start of the current stream from the view of para_server */
  73         struct timeval server_stream_start;
  74         /** the average time deviation between para_server and para_audiod */
  75         struct timeval sa_time_diff;
  76         /** whether client time is ahead of server time */
  77         int sa_time_diff_sign;
  78         /** non-zero if para_server's status is "playing" */
  79         int playing;
  80 };
  81
  82 extern struct status_task *stat_task;
  83 extern struct slot_info slot[MAX_STREAM_SLOTS];
  84 extern struct audiod_args_info conf;
  85 extern int audiod_status;
  86 extern const char *status_item_list[NUM_STAT_ITEMS];
  87
  88 void __noreturn clean_exit(int status, const char *msg);
  89 int handle_connect(int accept_fd);
  90 void audiod_status_dump(void);
  91 void dump_empty_status(void);
  92
  93 /** iterate over all slots */
  94 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)