2 * Copyright (C) 2005-2012 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file audiod.c The paraslash's audio daemon. */
15 #include "audiod.cmdline.h"
20 #include "buffer_tree.h"
22 #include "grab_client.h"
23 #include "client.cmdline.h"
31 #include "write_common.h"
35 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
36 /** define the array of error lists needed by para_audiod */
38 /** define the array containing all supported audio formats */
39 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
41 /** Defines how audiod handles one supported audio format. */
42 struct audio_format_info {
43 /** pointer to the receiver for this audio format */
44 struct receiver *receiver;
45 /** the receiver configuration */
47 /** the number of filters that should be activated for this audio format */
48 unsigned int num_filters;
49 /** Array of filter numbers to be activated. */
50 unsigned *filter_nums;
51 /** Pointer to the array of filter configurations. */
53 /** the number of filters that should be activated for this audio format */
54 unsigned int num_writers;
55 /** Array of writer numbers to be activated. */
57 /** pointer to the array of writer configurations */
59 /** do not start receiver/filters/writer before this time */
60 struct timeval restart_barrier;
64 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
65 * be associated with a receiver/filter/writer triple. This array holds all
66 * information on the status of these slots.
68 * \sa struct slot_info
70 struct slot_info slot[MAX_STREAM_SLOTS];
72 /** The vss status flags audiod is interested in. */
73 enum vss_status_flags {
74 /** Whether the 'N' flag is set. */
75 VSS_STATUS_FLAG_NEXT = 1,
76 /** The 'P' flag is set. */
77 VSS_STATUS_FLAG_PLAYING = 2,
80 struct sched sched = {.max_fileno = 0};
83 * The task for obtaining para_server's status (para_client stat).
85 * \sa struct task, struct sched.
88 /** The associated task structure of audiod. */
90 /** Client data associated with the stat task. */
91 struct client_task *ct;
92 /** Do not restart client command until this time. */
93 struct timeval restart_barrier;
94 /** Last time we received status data from para_server. */
95 struct timeval last_status_read;
97 /** The offset value announced by para_server. */
99 /** The length of the current audio file as announced by para_server. */
101 /** The start of the current stream from the view of para_server. */
102 struct timeval server_stream_start;
103 /** The average time deviation between para_server and para_audiod. */
104 struct timeval sa_time_diff;
105 /** Whether client time is ahead of server time. */
106 int sa_time_diff_sign;
107 /** The 'P' and the 'N' flags as announced by para_server. */
108 enum vss_status_flags vss_status;
109 /** Number of times the clock difference is to be checked. */
110 unsigned clock_diff_count;
111 /** When to start the next check for clock difference. */
112 struct timeval clock_diff_barrier;
113 /** Number of the audio format as announced by para_server. */
114 int current_audio_format_num;
115 /* The status task btrn is the child of the client task. */
116 struct btr_node *btrn;
119 /** The array of status items sent by para_server. */
120 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
123 * the current mode of operation of which can be changed by the on/off/cycle
124 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
126 int audiod_status = AUDIOD_ON;
129 * the gengetopt args_info struct that holds information on all command line
132 struct audiod_args_info conf;
134 static char *socket_name;
135 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
137 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
139 static struct status_task status_task_struct;
142 * the task that calls the status command of para_server
144 * \sa struct status_task
146 static struct status_task *stat_task = &status_task_struct;
149 * the task for handling audiod commands
151 * \sa struct task, struct sched
153 struct command_task {
154 /** the local listening socket */
156 /** the associated task structure */
160 /** iterate over all supported audio formats */
161 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
164 * Get the audio format number.
166 * \param name The name of the audio format.
168 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
169 * \a name is not a supported audio format.
171 static int get_audio_format_num(const char *name)
175 while (para_isspace(*name))
177 FOR_EACH_AUDIO_FORMAT(i)
178 if (!strcmp(name, audio_formats[i]))
180 return -E_UNSUPPORTED_AUDIO_FORMAT;
183 static int get_matching_audio_format_nums(const char *re)
188 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
192 FOR_EACH_AUDIO_FORMAT(i)
193 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
200 * Compute the play time based on information of the given slot.
202 * \param slot_num The slot number (negative means: no slot).
204 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
205 * from the status items received from para_server and the start time of the
206 * (first) writer of the given slot.
208 * It has to to take into account that probably the stream was not started at
209 * the beginning of the file, that the clock between the server and the client
210 * host may differ and that playback of the stream was delayed, e.g. because
211 * the prebuffer filter is used in the filter configuration of the given slot.
213 * If no writer is active in the given slot, or \a slot_num is negative
214 * (indicating that para_audiod runs in standby mode), an approximation based
215 * only on the status items is computed and the returned string is prefixed
218 * \return A string that must be freed by the caller.
220 char *get_time_string(int slot_num)
222 int ret, seconds = 0, length;
223 struct timeval *tmp, sum, sss, /* server stream start */
224 rstime, /* receiver start time */
225 wstime, /* writer start time */
226 wtime, /* now - writer start */
227 rskip; /* receiver start - sss */
228 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
231 if (audiod_status == AUDIOD_OFF)
233 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
234 if (stat_task->length_seconds) /* paused */
236 goto empty; /* stopped */
238 if (audiod_status == AUDIOD_ON && !s)
241 * Valid status items and playing, set length and tmp to the stream
242 * start. We use the slot info and fall back to the info from current
243 * status items if no slot info is available.
245 length = stat_task->length_seconds;
246 tmp = &stat_task->server_stream_start;
247 if (s && s->wns) { /* writer active in this slot */
248 btr_get_node_start(s->wns[0].btrn, &wstime);
249 if (wstime.tv_sec != 0) { /* writer wrote something */
250 if (s->server_stream_start.tv_sec == 0) {
251 /* copy status info to slot */
252 s->server_stream_start = stat_task->server_stream_start;
253 s->offset_seconds = stat_task->offset_seconds;
254 s->seconds_total = stat_task->length_seconds;
256 length = s->seconds_total;
257 tmp = &s->server_stream_start;
260 if (stat_task->sa_time_diff_sign > 0)
261 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
263 tv_add(tmp, &stat_task->sa_time_diff, &sss);
266 tv_diff(now, &sss, &diff);
267 seconds = diff.tv_sec + stat_task->offset_seconds;
270 tv_diff(now, &wstime, &wtime);
271 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
272 seconds = s->offset_seconds;
273 btr_get_node_start(s->receiver_node->btrn, &rstime);
274 ret = tv_diff(&rstime, &sss, &rskip);
275 if (ret > 0) { /* audiod was started in the middle of the stream */
276 tv_add(&wtime, &rskip, &sum);
277 seconds += sum.tv_sec;
279 seconds += wtime.tv_sec;
281 seconds = PARA_MIN(seconds, length);
282 seconds = PARA_MAX(seconds, 0);
284 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
288 (length - seconds) / 60,
289 (length - seconds) % 60,
290 length? (seconds * 100 + length / 2) / length : 0,
294 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
297 return para_strdup(NULL);
300 static int want_colors(void)
302 if (conf.color_arg == color_arg_no)
304 if (conf.color_arg == color_arg_yes)
306 if (conf.logfile_given)
308 return isatty(STDERR_FILENO);
311 static void parse_config_or_die(void)
315 struct audiod_cmdline_parser_params params = {
319 .check_ambiguity = 0,
323 if (conf.config_file_given)
324 config_file = para_strdup(conf.config_file_arg);
326 char *home = para_homedir();
327 config_file = make_message("%s/.paraslash/audiod.conf", home);
330 ret = file_exists(config_file);
331 if (conf.config_file_given && !ret) {
332 PARA_EMERG_LOG("can not read config file %s\n", config_file);
336 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
338 daemon_set_loglevel(conf.loglevel_arg);
345 static void setup_signal_handling(void)
347 sig_task->fd = para_signal_init();
348 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
349 para_install_sighandler(SIGINT);
350 para_install_sighandler(SIGTERM);
351 para_install_sighandler(SIGHUP);
352 para_sigaction(SIGPIPE, SIG_IGN);
355 static void clear_slot(int slot_num)
357 struct slot_info *s = &slot[slot_num];
359 PARA_INFO_LOG("clearing slot %d\n", slot_num);
360 memset(s, 0, sizeof(struct slot_info));
364 static void close_receiver(int slot_num)
366 struct slot_info *s = &slot[slot_num];
367 struct audio_format_info *a;
369 if (s->format < 0 || !s->receiver_node)
372 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
373 audio_formats[s->format], slot_num);
374 a->receiver->close(s->receiver_node);
375 btr_free_node(s->receiver_node->btrn);
376 free(s->receiver_node);
377 s->receiver_node = NULL;
378 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
379 &a->restart_barrier);
382 static void writer_cleanup(struct writer_node *wn)
388 w = writers + wn->writer_num;
389 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
391 btr_free_node(wn->btrn);
394 static void close_writers(struct slot_info *s)
396 struct audio_format_info *a;
403 if (a->num_writers == 0)
404 writer_cleanup(s->wns);
406 for (i = 0; i < a->num_writers; i++)
407 writer_cleanup(s->wns + i);
413 static void close_filters(struct slot_info *s)
416 struct audio_format_info *a = afi + s->format;
417 if (a->num_filters == 0)
419 for (i = 0; i < a->num_filters; i++) {
420 struct filter_node *fn = s->fns + i;
425 f = filters + fn->filter_num;
428 btr_free_node(fn->btrn);
435 * Whenever a task commits suicide by returning from post_select with t->error
436 * < 0, it also removes its btr node. We do exactly that to kill a running
437 * task. Note that the scheduler checks t->error also _before_ each pre/post
438 * select call, so the victim will never be scheduled again.
440 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
445 btr_remove_node(btrn);
448 static void kill_all_decoders(int error)
453 struct slot_info *s = slot + i;
456 if (!s->receiver_node)
458 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
463 static int get_empty_slot(void)
474 if (s->wns || s->receiver_node || s->fns)
479 return -E_NO_MORE_SLOTS;
482 static void open_filters(struct slot_info *s)
484 struct audio_format_info *a = afi + s->format;
485 struct filter_node *fn;
486 int nf = a->num_filters;
487 struct btr_node *parent;
492 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
493 assert(s->fns == NULL);
494 s->fns = para_calloc(nf * sizeof(struct filter_node));
495 parent = s->receiver_node->btrn;
496 for (i = 0; i < nf; i++) {
497 struct filter *f = filters + a->filter_nums[i];
499 fn->filter_num = a->filter_nums[i];
500 fn->conf = a->filter_conf[i];
501 fn->task.pre_select = f->pre_select;
502 fn->task.post_select = f->post_select;
504 fn->btrn = btr_new_node(&(struct btr_node_description)
505 EMBRACE(.name = f->name, .parent = parent,
506 .handler = f->execute, .context = fn));
509 register_task(&sched, &fn->task);
511 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
512 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
513 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
517 static void open_writers(struct slot_info *s)
520 struct audio_format_info *a = afi + s->format;
521 struct writer_node *wn;
522 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
524 assert(s->wns == NULL);
525 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
526 * sizeof(struct writer_node));
527 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
528 for (i = 0; i < a->num_writers; i++) {
530 wn->conf = a->writer_conf[i];
531 wn->writer_num = a->writer_nums[i];
532 register_writer_node(wn, parent, &sched);
536 /* returns slot num on success */
537 static int open_receiver(int format)
539 struct audio_format_info *a = &afi[format];
542 struct receiver *r = a->receiver;
543 struct receiver_node *rn;
545 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
546 ret = get_empty_slot();
550 rn = para_calloc(sizeof(*rn));
552 rn->conf = a->receiver_conf;
553 rn->btrn = btr_new_node(&(struct btr_node_description)
554 EMBRACE(.name = r->name, .context = rn));
557 btr_free_node(rn->btrn);
563 s->receiver_node = rn;
564 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
565 audio_formats[format], r->name, slot_num);
566 rn->task.pre_select = r->pre_select;
567 rn->task.post_select = r->post_select;
568 sprintf(rn->task.status, "%s receiver node", r->name);
569 register_task(&sched, &rn->task);
573 static bool receiver_running(void)
576 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
579 struct slot_info *s = &slot[i];
580 long unsigned ss2 = s->server_stream_start.tv_sec;
582 if (!s->receiver_node)
584 if (s->receiver_node->task.error >= 0)
593 * Return the root node of the current buffer tree.
595 * This is only used for stream grabbing.
597 * \return \p NULL if no slot is currently active. If more than one buffer tree
598 * exists, the node corresponding to the most recently started receiver is
601 struct btr_node *audiod_get_btr_root(void)
603 int i, newest_slot = -1;
604 struct timeval newest_rstime = {0, 0};
607 struct slot_info *s = &slot[i];
608 struct timeval rstime;
609 if (!s->receiver_node)
611 if (s->receiver_node->task.error < 0)
613 btr_get_node_start(s->receiver_node->btrn, &rstime);
614 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
616 newest_rstime = rstime;
619 if (newest_slot == -1)
621 return slot[newest_slot].receiver_node->btrn;
624 /* whether a new instance of a decoder should be started. */
625 static bool must_start_decoder(void)
627 int cafn = stat_task->current_audio_format_num;
628 unsigned vs = stat_task->vss_status;
630 if (audiod_status != AUDIOD_ON)
636 if (vs & VSS_STATUS_FLAG_NEXT)
638 if (!(vs & VSS_STATUS_FLAG_PLAYING))
640 if (receiver_running())
642 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
647 static unsigned compute_time_diff(const struct timeval *status_time)
649 struct timeval tmp, diff;
650 static unsigned count;
651 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
652 const struct timeval max_deviation = {0, 500 * 1000};
653 const int time_smooth = 5;
657 sign = tv_diff(status_time, now, &diff);
658 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
659 // sign, sa_time_diff_sign);
661 sa_time_diff_sign = sign;
662 stat_task->sa_time_diff = diff;
667 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
668 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
669 PARA_WARNING_LOG("time diff jump: %lims\n",
673 sa_time_diff_sign = tv_convex_combination(
674 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
675 count > 10? sign : sign * time_smooth, &diff,
677 stat_task->sa_time_diff = tmp;
678 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
681 sa_time_diff_sign < 0? "-" : "+",
682 tv2ms(&stat_task->sa_time_diff)
685 stat_task->sa_time_diff_sign = sa_time_diff_sign;
689 static int update_item(int itemnum, char *buf)
691 long unsigned sec, usec;
693 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
695 free(stat_item_values[itemnum]);
696 stat_item_values[itemnum] = para_strdup(buf);
697 stat_client_write_item(itemnum);
699 case SI_STATUS_FLAGS:
700 stat_task->vss_status = 0;
701 if (strchr(buf, 'N'))
702 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
703 if (strchr(buf, 'P'))
704 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
707 stat_task->offset_seconds = atoi(buf);
709 case SI_SECONDS_TOTAL:
710 stat_task->length_seconds = atoi(buf);
712 case SI_STREAM_START:
713 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
714 stat_task->server_stream_start.tv_sec = sec;
715 stat_task->server_stream_start.tv_usec = usec;
718 case SI_CURRENT_TIME:
719 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
720 struct timeval tv = {sec, usec};
721 compute_time_diff(&tv);
725 stat_task->current_audio_format_num
726 = get_audio_format_num(buf);
731 static int parse_stream_command(const char *txt, char **cmd)
734 char *re, *p = strchr(txt, ':');
737 return -E_MISSING_COLON;
740 re = malloc(len + 1);
741 strncpy(re, txt, len);
743 ret = get_matching_audio_format_nums(re);
748 static int add_filter(int format, char *cmdline)
750 struct audio_format_info *a = &afi[format];
751 int filter_num, nf = a->num_filters;
754 filter_num = check_filter_arg(cmdline, &cfg);
757 a->filter_conf = para_realloc(a->filter_conf,
758 (nf + 1) * sizeof(void *));
759 a->filter_nums = para_realloc(a->filter_nums,
760 (nf + 1) * sizeof(unsigned));
761 a->filter_nums[nf] = filter_num;
762 a->filter_conf[nf] = cfg;
764 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
765 filters[filter_num].name);
769 static int parse_writer_args(void)
773 struct audio_format_info *a;
775 for (i = 0; i < conf.writer_given; i++) {
777 int j, nw, writer_num, af_mask;
779 ret = parse_stream_command(conf.writer_arg[i], &cmd);
783 FOR_EACH_AUDIO_FORMAT(j) {
785 if ((af_mask & (1 << j)) == 0) /* no match */
787 wconf = check_writer_arg_or_die(cmd, &writer_num);
789 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
790 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
791 a->writer_nums[nw] = writer_num;
792 a->writer_conf[nw] = wconf;
793 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
794 nw, writer_names[writer_num]);
798 /* Use default writer for audio formats which are not yet set up. */
799 FOR_EACH_AUDIO_FORMAT(i) {
800 struct writer *w = writers + DEFAULT_WRITER;
802 if (a->num_writers > 0)
803 continue; /* already set up */
804 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
805 writer_names[DEFAULT_WRITER]);
806 a->writer_nums = para_malloc(sizeof(int));
807 a->writer_nums[0] = DEFAULT_WRITER;
808 a->writer_conf = para_malloc(sizeof(void *));
809 a->writer_conf[0] = w->parse_config_or_die("");
815 static int parse_receiver_args(void)
817 int i, ret, receiver_num;
819 struct audio_format_info *a;
821 for (i = conf.receiver_given - 1; i >= 0; i--) {
825 ret = parse_stream_command(conf.receiver_arg[i], &arg);
829 FOR_EACH_AUDIO_FORMAT(j) {
831 if ((af_mask & (1 << j)) == 0) /* no match */
834 * If multiple receivers are given for this audio format, the
835 * last one wins and we have to free the previous receiver
836 * config here. Since we are iterating backwards, the winning
837 * receiver arg is in fact the first one given.
839 if (a->receiver_conf)
840 a->receiver->free_config(a->receiver_conf);
841 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
842 ret = -E_RECV_SYNTAX;
843 if (!a->receiver_conf)
845 a->receiver = receivers + receiver_num;
849 * Use the first available receiver with no arguments for those audio
850 * formats for which no receiver was specified.
852 cmd = para_strdup(receivers[0].name);
853 FOR_EACH_AUDIO_FORMAT(i) {
855 if (a->receiver_conf)
857 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
858 if (!a->receiver_conf)
859 return -E_RECV_SYNTAX;
860 a->receiver = &receivers[receiver_num];
862 FOR_EACH_AUDIO_FORMAT(i) {
864 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
865 audio_formats[i], a->receiver->name);
873 static int init_default_filters(void)
877 FOR_EACH_AUDIO_FORMAT(i) {
878 struct audio_format_info *a = &afi[i];
883 continue; /* no default -- nothing to to */
885 * udp and dccp streams are fec-encoded, so add fecdec as the
888 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
889 strcmp(afi[i].receiver->name, "dccp") == 0) {
890 tmp = para_strdup("fecdec");
896 /* add "dec" to audio format name */
897 tmp = make_message("%sdec", audio_formats[i]);
898 for (j = 0; filters[j].name; j++)
899 if (!strcmp(tmp, filters[j].name))
902 ret = -E_UNSUPPORTED_FILTER;
903 if (!filters[j].name)
905 tmp = para_strdup(filters[j].name);
906 ret = add_filter(i, tmp);
910 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
917 static int parse_filter_args(void)
919 int i, j, ret, af_mask;
921 if (!conf.no_default_filters_given)
922 return init_default_filters();
923 for (i = 0; i < conf.filter_given; i++) {
925 ret = parse_stream_command(conf.filter_arg[i], &arg);
929 FOR_EACH_AUDIO_FORMAT(j) {
930 if ((af_mask & (1 << j)) == 0) /* no match */
932 ret = add_filter(j, arg);
937 ret = init_default_filters(); /* use default values for the rest */
942 static int parse_stream_args(void)
946 ret = parse_receiver_args();
949 ret = parse_filter_args();
952 ret = parse_writer_args();
958 /* does not unlink socket on errors */
959 static int audiod_get_socket(void)
961 struct sockaddr_un unix_addr;
964 if (conf.socket_given)
965 socket_name = para_strdup(conf.socket_arg);
967 char *hn = para_hostname();
968 socket_name = make_message("/var/paraslash/audiod_socket.%s",
972 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
973 if (conf.force_given)
975 ret = create_local_socket(socket_name, &unix_addr,
976 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
980 if (listen(fd , 5) < 0) {
981 ret = -ERRNO_TO_PARA_ERROR(errno);
984 ret = mark_fd_nonblocking(fd);
989 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
993 static void signal_pre_select(struct sched *s, struct task *t)
995 struct signal_task *st = container_of(t, struct signal_task, task);
996 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
999 static void signal_post_select(struct sched *s, __a_unused struct task *t)
1003 signum = para_next_signal(&s->rfds);
1008 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1009 clean_exit(EXIT_FAILURE, "caught deadly signal");
1013 static void signal_setup_default(struct signal_task *st)
1015 st->task.pre_select = signal_pre_select;
1016 st->task.post_select = signal_post_select;
1017 sprintf(st->task.status, "signal task");
1020 static void command_pre_select(struct sched *s, struct task *t)
1022 struct command_task *ct = container_of(t, struct command_task, task);
1023 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1026 static void command_post_select(struct sched *s, struct task *t)
1029 struct command_task *ct = container_of(t, struct command_task, task);
1030 static struct timeval last_status_dump;
1031 struct timeval tmp, delay = {0, 500 * 1000};
1033 tv_add(&last_status_dump, &delay, &tmp);
1034 if (tv_diff(&tmp, now, NULL) < 0) {
1035 audiod_status_dump();
1036 last_status_dump = *now;
1039 ret = handle_connect(ct->fd, &s->rfds);
1041 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1042 audiod_status_dump();
1045 static void init_command_task(struct command_task *ct)
1047 ct->task.pre_select = command_pre_select;
1048 ct->task.post_select = command_post_select;
1050 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1051 sprintf(ct->task.status, "command task");
1054 static void close_stat_pipe(void)
1058 client_close(stat_task->ct);
1059 stat_task->ct = NULL;
1060 clear_and_dump_items();
1061 stat_task->length_seconds = 0;
1062 stat_task->offset_seconds = 0;
1063 stat_task->vss_status = 0;
1064 stat_task->current_audio_format_num = -1;
1065 audiod_status_dump();
1069 * close the connection to para_server and exit
1071 * \param status the exit status which is passed to exit(3)
1072 * \param msg the log message
1074 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1075 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1080 void __noreturn clean_exit(int status, const char *msg)
1082 PARA_EMERG_LOG("%s\n", msg);
1084 unlink(socket_name);
1089 /* avoid busy loop if server is down */
1090 static void set_stat_task_restart_barrier(unsigned seconds)
1092 struct timeval delay = {seconds, 0};
1093 tv_add(now, &delay, &stat_task->restart_barrier);
1096 static void try_to_close_slot(int slot_num)
1098 struct slot_info *s = &slot[slot_num];
1099 struct audio_format_info *a = afi + s->format;
1104 if (s->receiver_node && s->receiver_node->task.error >= 0)
1106 for (i = 0; i < a->num_filters; i++)
1107 if (s->fns && s->fns[i].task.error >= 0)
1109 if (a->num_writers > 0) {
1110 for (i = 0; i < a->num_writers; i++)
1111 if (s->wns && s->wns[i].task.error >= 0)
1114 if (s->wns && s->wns[0].task.error >= 0)
1117 PARA_INFO_LOG("closing slot %d\n", slot_num);
1120 close_receiver(slot_num);
1121 clear_slot(slot_num);
1125 * Check if any receivers/filters/writers need to be started and do so if
1128 static void start_stop_decoders(void)
1131 struct slot_info *sl;
1132 struct audio_format_info *a;
1135 try_to_close_slot(i);
1136 if (audiod_status != AUDIOD_ON ||
1137 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1138 return kill_all_decoders(-E_NOT_PLAYING);
1139 if (!must_start_decoder())
1141 ret = open_receiver(stat_task->current_audio_format_num);
1143 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1147 a = afi + sl->format;
1151 activate_grab_clients(&sched);
1152 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1155 static void status_pre_select(struct sched *s, struct task *t)
1157 struct status_task *st = container_of(t, struct status_task, task);
1158 int ret, cafn = stat_task->current_audio_format_num;
1160 if (must_start_decoder())
1162 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1165 if (st->ct && audiod_status == AUDIOD_OFF)
1167 if (!st->ct && audiod_status != AUDIOD_OFF)
1168 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1170 sched_request_barrier(&afi[cafn].restart_barrier, s);
1172 * If para_server is playing we'd like to have a smooth time display
1173 * even if we are running in standby mode. So we request a timeout that
1174 * expires at the next full second.
1176 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1177 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1183 /* restart the client task if necessary */
1184 static void status_post_select(struct sched *s, struct task *t)
1186 struct status_task *st = container_of(t, struct status_task, task);
1188 if (audiod_status == AUDIOD_OFF) {
1191 if (st->ct->task.error >= 0) {
1192 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1195 if (st->ct->task.error >= 0)
1198 st->clock_diff_count = conf.clock_diff_count_arg;
1205 if (st->ct->task.error < 0) {
1206 if (st->ct->task.error >= 0)
1211 if (st->ct->status != CL_RECEIVING)
1213 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1215 struct timeval diff;
1216 tv_diff(now, &st->last_status_read, &diff);
1217 if (diff.tv_sec > 61)
1218 kill_btrn(st->ct->btrn, &st->ct->task,
1222 btr_merge(st->btrn, st->min_iqs);
1223 sz = btr_next_buffer(st->btrn, &buf);
1224 ret = for_each_stat_item(buf, sz, update_item);
1226 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1230 btr_consume(st->btrn, sz - ret);
1231 st->last_status_read = *now;
1233 } else /* current status item crosses buffers */
1234 st->min_iqs = sz + 1;
1237 btr_drain(st->btrn);
1238 st->current_audio_format_num = -1;
1239 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1241 if (st->clock_diff_count) { /* get status only one time */
1242 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1244 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1245 st->clock_diff_count--;
1246 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1247 set_stat_task_restart_barrier(2);
1250 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1252 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1253 set_stat_task_restart_barrier(5);
1255 free(stat_item_values[SI_BASENAME]);
1256 stat_item_values[SI_BASENAME] = para_strdup(
1257 "no connection to para_server");
1258 stat_client_write_item(SI_BASENAME);
1259 st->last_status_read = *now;
1261 start_stop_decoders();
1264 static void init_status_task(struct status_task *st)
1266 memset(st, 0, sizeof(struct status_task));
1267 st->task.pre_select = status_pre_select;
1268 st->task.post_select = status_post_select;
1269 st->sa_time_diff_sign = 1;
1270 st->clock_diff_count = conf.clock_diff_count_arg;
1271 st->current_audio_format_num = -1;
1272 sprintf(st->task.status, "stat");
1273 st->btrn = btr_new_node(&(struct btr_node_description)
1274 EMBRACE(.name = "stat"));
1277 static void set_initial_status(void)
1279 audiod_status = AUDIOD_ON;
1280 if (!conf.mode_given)
1282 if (!strcmp(conf.mode_arg, "sb")) {
1283 audiod_status = AUDIOD_STANDBY;
1286 if (!strcmp(conf.mode_arg, "off")) {
1287 audiod_status = AUDIOD_OFF;
1290 if (strcmp(conf.mode_arg, "on"))
1291 PARA_WARNING_LOG("invalid mode\n");
1294 __noreturn static void print_help_and_die(void)
1296 int d = conf.detailed_help_given;
1297 const char **p = d? audiod_args_info_detailed_help
1298 : audiod_args_info_help;
1300 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1301 AUDIOD_CMDLINE_PARSER_VERSION);
1302 printf_or_die("%s\n\n", audiod_args_info_usage);
1304 printf_or_die("%s\n", *p);
1305 print_receiver_helps(d);
1306 print_filter_helps(d);
1307 print_writer_helps(d);
1311 static void init_colors_or_die(void)
1317 daemon_set_default_log_colors();
1318 daemon_set_flag(DF_COLOR_LOG);
1319 for (i = 0; i < conf.log_color_given; i++)
1320 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1324 * the main function of para_audiod
1326 * \param argc usual argument count
1327 * \param argv usual argument vector
1329 * \return EXIT_SUCCESS or EXIT_FAILURE
1331 * \sa para_audiod(1)
1333 int main(int argc, char *argv[])
1336 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1337 struct audiod_cmdline_parser_params params = {
1340 .check_required = 0,
1341 .check_ambiguity = 0,
1346 if (audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms))
1348 HANDLE_VERSION_FLAG("audiod", conf);
1349 /* init receivers/filters/writers early to make help work */
1353 if (conf.help_given || conf.detailed_help_given)
1354 print_help_and_die();
1355 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1356 parse_config_or_die();
1357 init_colors_or_die();
1358 init_random_seed_or_die();
1359 daemon_set_flag(DF_LOG_TIME);
1360 daemon_set_flag(DF_LOG_HOSTNAME);
1361 daemon_set_flag(DF_LOG_LL);
1362 if (conf.log_timing_given)
1363 daemon_set_flag(DF_LOG_TIMING);
1364 if (conf.logfile_given) {
1365 daemon_set_logfile(conf.logfile_arg);
1366 daemon_open_log_or_die();
1368 ret = parse_stream_args();
1370 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1373 log_welcome("para_audiod");
1374 set_server_start_time(NULL);
1375 set_initial_status();
1378 setup_signal_handling();
1379 signal_setup_default(sig_task);
1381 init_status_task(stat_task);
1382 init_command_task(cmd_task);
1384 if (conf.daemon_given)
1385 daemonize(false /* parent exits immediately */);
1387 register_task(&sched, &sig_task->task);
1388 register_task(&sched, &cmd_task->task);
1389 register_task(&sched, &stat_task->task);
1390 sched.default_timeout.tv_sec = 2;
1391 sched.default_timeout.tv_usec = 999 * 1000;
1392 ret = schedule(&sched);
1394 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1395 return EXIT_FAILURE;