2 * Copyright (C) 2005-2013 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"
19 #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 DEFINE_RECEIVER_ARRAY;
43 /** Defines how audiod handles one supported audio format. */
44 struct audio_format_info {
45 /** pointer to the receiver for this audio format */
46 struct receiver *receiver;
47 /** the receiver configuration */
49 /** the number of filters that should be activated for this audio format */
50 unsigned int num_filters;
51 /** Array of filter numbers to be activated. */
52 unsigned *filter_nums;
53 /** Pointer to the array of filter configurations. */
55 /** the number of filters that should be activated for this audio format */
56 unsigned int num_writers;
57 /** Array of writer numbers to be activated. */
59 /** pointer to the array of writer configurations */
61 /** do not start receiver/filters/writer before this time */
62 struct timeval restart_barrier;
66 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
67 * be associated with a receiver/filter/writer triple. This array holds all
68 * information on the status of these slots.
70 * \sa struct slot_info
72 struct slot_info slot[MAX_STREAM_SLOTS];
74 /** The vss status flags audiod is interested in. */
75 enum vss_status_flags {
76 /** Whether the 'N' flag is set. */
77 VSS_STATUS_FLAG_NEXT = 1,
78 /** The 'P' flag is set. */
79 VSS_STATUS_FLAG_PLAYING = 2,
83 * The scheduler instance of para_audiod.
85 * This is needed also in audiod_command.c (for the tasks command), so it can
88 struct sched sched = {.max_fileno = 0};
91 * The task for obtaining para_server's status (para_client stat).
93 * \sa struct task, struct sched.
96 /** The associated task structure of audiod. */
98 /** Client data associated with the stat task. */
99 struct client_task *ct;
100 /** Do not restart client command until this time. */
101 struct timeval restart_barrier;
102 /** Last time we received status data from para_server. */
103 struct timeval last_status_read;
105 /** The offset value announced by para_server. */
107 /** The length of the current audio file as announced by para_server. */
109 /** The start of the current stream from the view of para_server. */
110 struct timeval server_stream_start;
111 /** The average time deviation between para_server and para_audiod. */
112 struct timeval sa_time_diff;
113 /** Whether client time is ahead of server time. */
114 int sa_time_diff_sign;
115 /** The 'P' and the 'N' flags as announced by para_server. */
116 enum vss_status_flags vss_status;
117 /** Number of times the clock difference is to be checked. */
118 unsigned clock_diff_count;
119 /** When to start the next check for clock difference. */
120 struct timeval clock_diff_barrier;
121 /** Number of the audio format as announced by para_server. */
122 int current_audio_format_num;
123 /* The status task btrn is the child of the client task. */
124 struct btr_node *btrn;
127 /** The array of status items sent by para_server. */
128 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
131 * the current mode of operation of which can be changed by the on/off/cycle
132 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
134 int audiod_status = AUDIOD_ON;
137 * the gengetopt args_info struct that holds information on all command line
140 struct audiod_args_info conf;
142 static char *socket_name;
143 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
145 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
147 static struct status_task status_task_struct;
150 * the task that calls the status command of para_server
152 * \sa struct status_task
154 static struct status_task *stat_task = &status_task_struct;
157 * the task for handling audiod commands
159 * \sa struct task, struct sched
161 struct command_task {
162 /** the local listening socket */
164 /** the associated task structure */
168 /** iterate over all supported audio formats */
169 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
172 * Get the audio format number.
174 * \param name The name of the audio format.
176 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
177 * \a name is not a supported audio format.
179 static int get_audio_format_num(const char *name)
183 while (para_isspace(*name))
185 FOR_EACH_AUDIO_FORMAT(i)
186 if (!strcmp(name, audio_formats[i]))
188 return -E_UNSUPPORTED_AUDIO_FORMAT;
191 static int get_matching_audio_format_nums(const char *re)
196 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
200 FOR_EACH_AUDIO_FORMAT(i)
201 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
208 * Compute the play time based on information of the given slot.
210 * \param slot_num The slot number (negative means: no slot).
212 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
213 * from the status items received from para_server and the start time of the
214 * (first) writer of the given slot.
216 * It has to to take into account that probably the stream was not started at
217 * the beginning of the file, that the clock between the server and the client
218 * host may differ and that playback of the stream was delayed, e.g. because
219 * the prebuffer filter is used in the filter configuration of the given slot.
221 * If no writer is active in the given slot, or \a slot_num is negative
222 * (indicating that para_audiod runs in standby mode), an approximation based
223 * only on the status items is computed and the returned string is prefixed
226 * \return A string that must be freed by the caller.
228 char *get_time_string(int slot_num)
230 int ret, seconds = 0, length;
231 struct timeval *tmp, sum, sss, /* server stream start */
232 rstime, /* receiver start time */
233 wstime, /* writer start time */
234 wtime, /* now - writer start */
235 rskip; /* receiver start - sss */
236 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
239 if (audiod_status == AUDIOD_OFF)
241 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
242 if (stat_task->length_seconds) /* paused */
244 goto empty; /* stopped */
246 if (audiod_status == AUDIOD_ON && !s)
249 * Valid status items and playing, set length and tmp to the stream
250 * start. We use the slot info and fall back to the info from current
251 * status items if no slot info is available.
253 length = stat_task->length_seconds;
254 tmp = &stat_task->server_stream_start;
255 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
256 btr_get_node_start(s->wns[0].btrn, &wstime);
257 if (wstime.tv_sec != 0) { /* writer wrote something */
258 if (s->server_stream_start.tv_sec == 0) {
259 /* copy status info to slot */
260 s->server_stream_start = stat_task->server_stream_start;
261 s->offset_seconds = stat_task->offset_seconds;
262 s->seconds_total = stat_task->length_seconds;
264 length = s->seconds_total;
265 tmp = &s->server_stream_start;
268 if (stat_task->sa_time_diff_sign > 0)
269 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
271 tv_add(tmp, &stat_task->sa_time_diff, &sss);
272 if (!s || !s->wns || !s->wns[0].btrn) {
274 tv_diff(now, &sss, &diff);
275 seconds = diff.tv_sec + stat_task->offset_seconds;
278 tv_diff(now, &wstime, &wtime);
279 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
280 seconds = s->offset_seconds;
281 if (s->receiver_node->btrn) {
282 btr_get_node_start(s->receiver_node->btrn, &rstime);
283 ret = tv_diff(&rstime, &sss, &rskip);
284 if (ret > 0) { /* audiod was started in the middle of the stream */
285 tv_add(&wtime, &rskip, &sum);
286 seconds += sum.tv_sec;
288 seconds += wtime.tv_sec;
290 seconds += wtime.tv_sec;
292 seconds = PARA_MIN(seconds, length);
293 seconds = PARA_MAX(seconds, 0);
295 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
299 (length - seconds) / 60,
300 (length - seconds) % 60,
301 length? (seconds * 100 + length / 2) / length : 0,
305 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
308 return para_strdup(NULL);
311 static int want_colors(void)
313 if (conf.color_arg == color_arg_no)
315 if (conf.color_arg == color_arg_yes)
317 if (conf.logfile_given)
319 return isatty(STDERR_FILENO);
322 static void parse_config_or_die(void)
326 struct audiod_cmdline_parser_params params = {
330 .check_ambiguity = 0,
334 if (conf.config_file_given)
335 config_file = para_strdup(conf.config_file_arg);
337 char *home = para_homedir();
338 config_file = make_message("%s/.paraslash/audiod.conf", home);
341 ret = file_exists(config_file);
342 if (conf.config_file_given && !ret) {
343 PARA_EMERG_LOG("can not read config file %s\n", config_file);
347 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
348 daemon_set_loglevel(conf.loglevel_arg);
357 static void setup_signal_handling(void)
359 sig_task->fd = para_signal_init();
360 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
361 para_install_sighandler(SIGINT);
362 para_install_sighandler(SIGTERM);
363 para_install_sighandler(SIGHUP);
364 para_sigaction(SIGPIPE, SIG_IGN);
367 static void clear_slot(int slot_num)
369 struct slot_info *s = &slot[slot_num];
371 PARA_INFO_LOG("clearing slot %d\n", slot_num);
372 memset(s, 0, sizeof(struct slot_info));
376 static void close_receiver(int slot_num)
378 struct slot_info *s = &slot[slot_num];
379 struct audio_format_info *a;
381 if (s->format < 0 || !s->receiver_node)
384 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
385 audio_formats[s->format], slot_num);
386 a->receiver->close(s->receiver_node);
387 btr_remove_node(&s->receiver_node->btrn);
388 free(s->receiver_node);
389 s->receiver_node = NULL;
390 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
391 &a->restart_barrier);
394 static void writer_cleanup(struct writer_node *wn)
400 w = writers + wn->writer_num;
401 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
403 btr_remove_node(&wn->btrn);
406 static void close_writers(struct slot_info *s)
408 struct audio_format_info *a;
415 if (a->num_writers == 0)
416 writer_cleanup(s->wns);
418 for (i = 0; i < a->num_writers; i++)
419 writer_cleanup(s->wns + i);
425 static void close_filters(struct slot_info *s)
428 struct audio_format_info *a = afi + s->format;
429 if (a->num_filters == 0)
431 for (i = a->num_filters - 1; i >= 0; i--) {
432 struct filter_node *fn = s->fns + i;
437 f = filters + fn->filter_num;
440 btr_remove_node(&fn->btrn);
446 static void notify_receivers(int error)
451 struct slot_info *s = slot + i;
454 if (!s->receiver_node)
456 task_notify(&s->receiver_node->task, error);
460 static int get_empty_slot(void)
471 if (s->wns || s->receiver_node || s->fns)
476 return -E_NO_MORE_SLOTS;
479 static void open_filters(struct slot_info *s)
481 struct audio_format_info *a = afi + s->format;
482 struct filter_node *fn;
483 int nf = a->num_filters;
484 struct btr_node *parent;
489 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
490 assert(s->fns == NULL);
491 s->fns = para_calloc(nf * sizeof(struct filter_node));
492 parent = s->receiver_node->btrn;
493 for (i = 0; i < nf; i++) {
494 struct filter *f = filters + a->filter_nums[i];
496 fn->filter_num = a->filter_nums[i];
497 fn->conf = a->filter_conf[i];
498 fn->task.pre_select = f->pre_select;
499 fn->task.post_select = f->post_select;
500 fn->btrn = btr_new_node(&(struct btr_node_description)
501 EMBRACE(.name = f->name, .parent = parent,
502 .handler = f->execute, .context = fn));
505 register_task(&sched, &fn->task);
507 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
508 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
509 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
513 static void open_writers(struct slot_info *s)
516 struct audio_format_info *a = afi + s->format;
517 struct writer_node *wn;
518 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
520 assert(s->wns == NULL);
521 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
522 * sizeof(struct writer_node));
523 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
524 for (i = 0; i < a->num_writers; i++) {
526 wn->conf = a->writer_conf[i];
527 wn->writer_num = a->writer_nums[i];
528 register_writer_node(wn, parent, &sched);
532 /* returns slot num on success */
533 static int open_receiver(int format)
535 struct audio_format_info *a = &afi[format];
538 struct receiver *r = a->receiver;
539 struct receiver_node *rn;
541 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
542 ret = get_empty_slot();
546 rn = para_calloc(sizeof(*rn));
548 rn->conf = a->receiver_conf;
549 rn->btrn = btr_new_node(&(struct btr_node_description)
550 EMBRACE(.name = r->name, .context = rn));
553 btr_remove_node(&rn->btrn);
559 s->receiver_node = rn;
560 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
561 audio_formats[format], r->name, slot_num);
562 rn->task.pre_select = r->pre_select;
563 rn->task.post_select = r->post_select;
564 sprintf(rn->task.status, "%s receiver node", r->name);
565 register_task(&sched, &rn->task);
569 static bool receiver_running(void)
572 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
575 struct slot_info *s = &slot[i];
576 long unsigned ss2 = s->server_stream_start.tv_sec;
578 if (!s->receiver_node)
580 if (s->receiver_node->task.error >= 0)
589 * Return the root node of the current buffer tree.
591 * This is only used for stream grabbing.
593 * \return \p NULL if no slot is currently active. If more than one buffer tree
594 * exists, the node corresponding to the most recently started receiver is
597 struct btr_node *audiod_get_btr_root(void)
599 int i, newest_slot = -1;
600 struct timeval newest_rstime = {0, 0};
603 struct slot_info *s = &slot[i];
604 struct timeval rstime;
605 if (!s->receiver_node)
607 if (s->receiver_node->task.error < 0)
609 btr_get_node_start(s->receiver_node->btrn, &rstime);
610 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
612 newest_rstime = rstime;
615 if (newest_slot == -1)
617 return slot[newest_slot].receiver_node->btrn;
620 /* whether a new instance of a decoder should be started. */
621 static bool must_start_decoder(void)
623 int cafn = stat_task->current_audio_format_num;
624 unsigned vs = stat_task->vss_status;
626 if (audiod_status != AUDIOD_ON)
632 if (vs & VSS_STATUS_FLAG_NEXT)
634 if (!(vs & VSS_STATUS_FLAG_PLAYING))
636 if (receiver_running())
638 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
643 static unsigned compute_time_diff(const struct timeval *status_time)
645 struct timeval tmp, diff;
646 static unsigned count;
647 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
648 const struct timeval max_deviation = {0, 500 * 1000};
649 const int time_smooth = 5;
653 sign = tv_diff(status_time, now, &diff);
654 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
655 // sign, sa_time_diff_sign);
657 sa_time_diff_sign = sign;
658 stat_task->sa_time_diff = diff;
663 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
664 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
665 PARA_WARNING_LOG("time diff jump: %lims\n",
669 sa_time_diff_sign = tv_convex_combination(
670 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
671 count > 10? sign : sign * time_smooth, &diff,
673 stat_task->sa_time_diff = tmp;
674 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
677 sa_time_diff_sign < 0? "-" : "+",
678 tv2ms(&stat_task->sa_time_diff)
681 stat_task->sa_time_diff_sign = sa_time_diff_sign;
685 static int update_item(int itemnum, char *buf)
687 long unsigned sec, usec;
689 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
691 free(stat_item_values[itemnum]);
692 stat_item_values[itemnum] = para_strdup(buf);
693 stat_client_write_item(itemnum);
695 case SI_STATUS_FLAGS:
696 stat_task->vss_status = 0;
697 if (strchr(buf, 'N'))
698 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
699 if (strchr(buf, 'P'))
700 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
703 stat_task->offset_seconds = atoi(buf);
705 case SI_SECONDS_TOTAL:
706 stat_task->length_seconds = atoi(buf);
708 case SI_STREAM_START:
709 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
710 stat_task->server_stream_start.tv_sec = sec;
711 stat_task->server_stream_start.tv_usec = usec;
714 case SI_CURRENT_TIME:
715 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
716 struct timeval tv = {sec, usec};
717 compute_time_diff(&tv);
721 stat_task->current_audio_format_num
722 = get_audio_format_num(buf);
727 static int parse_stream_command(const char *txt, char **cmd)
730 char *re, *p = strchr(txt, ':');
733 return -E_MISSING_COLON;
736 re = malloc(len + 1);
737 strncpy(re, txt, len);
739 ret = get_matching_audio_format_nums(re);
744 static int add_filter(int format, char *cmdline)
746 struct audio_format_info *a = &afi[format];
747 int filter_num, nf = a->num_filters;
750 filter_num = check_filter_arg(cmdline, &cfg);
753 a->filter_conf = para_realloc(a->filter_conf,
754 (nf + 1) * sizeof(void *));
755 a->filter_nums = para_realloc(a->filter_nums,
756 (nf + 1) * sizeof(unsigned));
757 a->filter_nums[nf] = filter_num;
758 a->filter_conf[nf] = cfg;
760 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
761 filters[filter_num].name);
765 static int parse_writer_args(void)
769 struct audio_format_info *a;
771 for (i = 0; i < conf.writer_given; i++) {
773 int j, nw, writer_num, af_mask;
775 ret = parse_stream_command(conf.writer_arg[i], &cmd);
779 FOR_EACH_AUDIO_FORMAT(j) {
781 if ((af_mask & (1 << j)) == 0) /* no match */
783 wconf = check_writer_arg_or_die(cmd, &writer_num);
785 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
786 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
787 a->writer_nums[nw] = writer_num;
788 a->writer_conf[nw] = wconf;
789 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
790 nw, writer_names[writer_num]);
794 /* Use default writer for audio formats which are not yet set up. */
795 FOR_EACH_AUDIO_FORMAT(i) {
799 if (a->num_writers > 0)
800 continue; /* already set up */
801 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
802 a->writer_nums = para_malloc(sizeof(int));
803 a->writer_nums[0] = writer_num;
804 a->writer_conf = para_malloc(sizeof(void *));
805 a->writer_conf[0] = writer_conf;
807 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
808 writer_names[writer_num]);
813 static int parse_receiver_args(void)
815 int i, ret, receiver_num;
817 struct audio_format_info *a;
819 for (i = conf.receiver_given - 1; i >= 0; i--) {
823 ret = parse_stream_command(conf.receiver_arg[i], &arg);
827 FOR_EACH_AUDIO_FORMAT(j) {
829 if ((af_mask & (1 << j)) == 0) /* no match */
832 * If multiple receivers are given for this audio format, the
833 * last one wins and we have to free the previous receiver
834 * config here. Since we are iterating backwards, the winning
835 * receiver arg is in fact the first one given.
837 if (a->receiver_conf)
838 a->receiver->free_config(a->receiver_conf);
839 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
840 ret = -E_RECV_SYNTAX;
841 if (!a->receiver_conf)
843 a->receiver = receivers + receiver_num;
847 * Use the first available receiver with no arguments for those audio
848 * formats for which no receiver was specified.
850 cmd = para_strdup(receivers[0].name);
851 FOR_EACH_AUDIO_FORMAT(i) {
853 if (a->receiver_conf)
855 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
856 if (!a->receiver_conf)
857 return -E_RECV_SYNTAX;
858 a->receiver = &receivers[receiver_num];
860 FOR_EACH_AUDIO_FORMAT(i) {
862 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
863 audio_formats[i], a->receiver->name);
871 static int init_default_filters(void)
875 FOR_EACH_AUDIO_FORMAT(i) {
876 struct audio_format_info *a = &afi[i];
881 continue; /* no default -- nothing to to */
883 * udp and dccp streams are fec-encoded, so add fecdec as the
886 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
887 strcmp(afi[i].receiver->name, "dccp") == 0) {
888 tmp = para_strdup("fecdec");
894 /* add "dec" to audio format name */
895 tmp = make_message("%sdec", audio_formats[i]);
896 for (j = 0; filters[j].name; j++)
897 if (!strcmp(tmp, filters[j].name))
900 ret = -E_UNSUPPORTED_FILTER;
901 if (!filters[j].name)
903 tmp = para_strdup(filters[j].name);
904 ret = add_filter(i, tmp);
908 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
915 static int parse_filter_args(void)
917 int i, j, ret, af_mask, num_matches;
919 for (i = 0; i < conf.filter_given; i++) {
921 ret = parse_stream_command(conf.filter_arg[i], &arg);
926 FOR_EACH_AUDIO_FORMAT(j) {
927 if ((af_mask & (1 << j)) == 0) /* no match */
929 ret = add_filter(j, arg);
934 if (num_matches == 0)
935 PARA_WARNING_LOG("ignoring filter spec: %s\n",
938 ret = init_default_filters(); /* use default values for the rest */
943 static int parse_stream_args(void)
947 ret = parse_receiver_args();
950 ret = parse_filter_args();
953 ret = parse_writer_args();
959 /* does not unlink socket on errors */
960 static int audiod_get_socket(void)
962 struct sockaddr_un unix_addr;
965 if (conf.socket_given)
966 socket_name = para_strdup(conf.socket_arg);
968 char *hn = para_hostname();
969 socket_name = make_message("/var/paraslash/audiod_socket.%s",
973 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
974 if (conf.force_given)
976 ret = create_local_socket(socket_name, &unix_addr,
977 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
981 if (listen(fd , 5) < 0) {
982 ret = -ERRNO_TO_PARA_ERROR(errno);
985 ret = mark_fd_nonblocking(fd);
990 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
994 static void signal_pre_select(struct sched *s, struct task *t)
996 struct signal_task *st = container_of(t, struct signal_task, task);
997 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1000 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1004 signum = para_next_signal(&s->rfds);
1009 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1010 clean_exit(EXIT_FAILURE, "caught deadly signal");
1015 static void signal_setup_default(struct signal_task *st)
1017 st->task.pre_select = signal_pre_select;
1018 st->task.post_select = signal_post_select;
1019 sprintf(st->task.status, "signal task");
1022 static void command_pre_select(struct sched *s, struct task *t)
1024 struct command_task *ct = container_of(t, struct command_task, task);
1025 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1028 static int command_post_select(struct sched *s, struct task *t)
1031 struct command_task *ct = container_of(t, struct command_task, task);
1032 static struct timeval last_status_dump;
1033 struct timeval tmp, delay = {0, 500 * 1000};
1035 tv_add(&last_status_dump, &delay, &tmp);
1036 if (tv_diff(&tmp, now, NULL) < 0) {
1037 audiod_status_dump();
1038 last_status_dump = *now;
1041 ret = handle_connect(ct->fd, &s->rfds);
1043 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1044 audiod_status_dump();
1048 static void init_command_task(struct command_task *ct)
1050 ct->task.pre_select = command_pre_select;
1051 ct->task.post_select = command_post_select;
1053 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1054 sprintf(ct->task.status, "command task");
1057 static void close_stat_pipe(void)
1061 client_close(stat_task->ct);
1062 stat_task->ct = NULL;
1063 clear_and_dump_items();
1064 stat_task->length_seconds = 0;
1065 stat_task->offset_seconds = 0;
1066 stat_task->vss_status = 0;
1067 stat_task->current_audio_format_num = -1;
1068 audiod_status_dump();
1072 * close the connection to para_server and exit
1074 * \param status the exit status which is passed to exit(3)
1075 * \param msg the log message
1077 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1078 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1083 void __noreturn clean_exit(int status, const char *msg)
1085 PARA_EMERG_LOG("%s\n", msg);
1087 unlink(socket_name);
1092 /* avoid busy loop if server is down */
1093 static void set_stat_task_restart_barrier(unsigned seconds)
1095 struct timeval delay = {seconds, 0};
1096 tv_add(now, &delay, &stat_task->restart_barrier);
1099 static bool must_close_slot(int slot_num)
1101 struct slot_info *s = &slot[slot_num];
1102 struct audio_format_info *a = afi + s->format;
1107 if (s->receiver_node && s->receiver_node->task.error >= 0)
1109 for (i = 0; i < a->num_filters; i++)
1110 if (s->fns && s->fns[i].task.error >= 0)
1112 if (a->num_writers > 0) {
1113 for (i = 0; i < a->num_writers; i++)
1114 if (s->wns && s->wns[i].task.error >= 0)
1117 if (s->wns && s->wns[0].task.error >= 0)
1123 static void close_unused_slots(void)
1128 struct slot_info *s = slot + i;
1129 if (!must_close_slot(i))
1131 PARA_INFO_LOG("closing slot %d\n", i);
1140 * Check if any receivers/filters/writers need to be started and do so if
1143 static void start_stop_decoders(void)
1146 struct slot_info *sl;
1147 struct audio_format_info *a;
1149 close_unused_slots();
1150 if (audiod_status != AUDIOD_ON ||
1151 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1152 return notify_receivers(E_NOT_PLAYING);
1153 if (!must_start_decoder())
1155 ret = open_receiver(stat_task->current_audio_format_num);
1157 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1161 a = afi + sl->format;
1165 activate_grab_clients(&sched);
1166 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1169 static void status_pre_select(struct sched *s, struct task *t)
1171 struct status_task *st = container_of(t, struct status_task, task);
1172 int i, ret, cafn = stat_task->current_audio_format_num;
1174 if (must_start_decoder())
1177 if (must_close_slot(i))
1179 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1182 if (st->ct && audiod_status == AUDIOD_OFF)
1184 if (!st->ct && audiod_status != AUDIOD_OFF)
1185 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1187 sched_request_barrier(&afi[cafn].restart_barrier, s);
1189 * If para_server is playing we'd like to have a smooth time display
1190 * even if we are running in standby mode. So we request a timeout that
1191 * expires at the next full second.
1193 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1194 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1200 /* restart the client task if necessary */
1201 static int status_post_select(struct sched *s, struct task *t)
1203 struct status_task *st = container_of(t, struct status_task, task);
1205 if (audiod_status == AUDIOD_OFF) {
1208 if (st->ct->task.error >= 0) {
1209 task_notify(&st->ct->task, E_AUDIOD_OFF);
1213 st->clock_diff_count = conf.clock_diff_count_arg;
1220 if (st->ct->task.error < 0) {
1224 if (st->ct->status != CL_EXECUTING)
1226 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1228 struct timeval diff;
1229 tv_diff(now, &st->last_status_read, &diff);
1230 if (diff.tv_sec > 61)
1231 task_notify(&st->ct->task, E_STATUS_TIMEOUT);
1234 btr_merge(st->btrn, st->min_iqs);
1235 sz = btr_next_buffer(st->btrn, &buf);
1236 ret = for_each_stat_item(buf, sz, update_item);
1238 task_notify(&st->ct->task, -ret);
1242 btr_consume(st->btrn, sz - ret);
1243 st->last_status_read = *now;
1245 } else /* current status item crosses buffers */
1246 st->min_iqs = sz + 1;
1249 btr_drain(st->btrn);
1250 st->current_audio_format_num = -1;
1251 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1253 if (st->clock_diff_count) { /* get status only one time */
1254 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1256 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1257 st->clock_diff_count--;
1258 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1259 set_stat_task_restart_barrier(2);
1262 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1264 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1265 set_stat_task_restart_barrier(5);
1267 free(stat_item_values[SI_BASENAME]);
1268 stat_item_values[SI_BASENAME] = para_strdup(
1269 "no connection to para_server");
1270 stat_client_write_item(SI_BASENAME);
1271 st->last_status_read = *now;
1273 start_stop_decoders();
1277 static void init_status_task(struct status_task *st)
1279 memset(st, 0, sizeof(struct status_task));
1280 st->task.pre_select = status_pre_select;
1281 st->task.post_select = status_post_select;
1282 st->sa_time_diff_sign = 1;
1283 st->clock_diff_count = conf.clock_diff_count_arg;
1284 st->current_audio_format_num = -1;
1285 sprintf(st->task.status, "stat");
1286 st->btrn = btr_new_node(&(struct btr_node_description)
1287 EMBRACE(.name = "stat"));
1290 static void set_initial_status(void)
1292 audiod_status = AUDIOD_ON;
1293 if (!conf.mode_given)
1295 if (!strcmp(conf.mode_arg, "sb")) {
1296 audiod_status = AUDIOD_STANDBY;
1299 if (!strcmp(conf.mode_arg, "off")) {
1300 audiod_status = AUDIOD_OFF;
1303 if (strcmp(conf.mode_arg, "on"))
1304 PARA_WARNING_LOG("invalid mode\n");
1307 __noreturn static void print_help_and_die(void)
1309 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1310 bool d = conf.detailed_help_given;
1313 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1314 ggo_print_help(&h, flags);
1316 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1317 print_receiver_helps(flags);
1318 print_filter_helps(flags);
1319 print_writer_helps(flags);
1323 static void init_colors_or_die(void)
1329 daemon_set_default_log_colors();
1330 daemon_set_flag(DF_COLOR_LOG);
1331 for (i = 0; i < conf.log_color_given; i++)
1332 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1336 * the main function of para_audiod
1338 * \param argc usual argument count
1339 * \param argv usual argument vector
1341 * \return EXIT_SUCCESS or EXIT_FAILURE
1343 * \sa para_audiod(1)
1345 int main(int argc, char *argv[])
1348 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1349 struct audiod_cmdline_parser_params params = {
1352 .check_required = 0,
1353 .check_ambiguity = 0,
1358 audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms);
1359 daemon_set_loglevel(conf.loglevel_arg);
1360 version_handle_flag("audiod", conf.version_given);
1361 /* init receivers/filters/writers early to make help work */
1365 if (conf.help_given || conf.detailed_help_given)
1366 print_help_and_die();
1367 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1368 parse_config_or_die();
1369 init_colors_or_die();
1370 init_random_seed_or_die();
1371 daemon_set_flag(DF_LOG_TIME);
1372 daemon_set_flag(DF_LOG_HOSTNAME);
1373 daemon_set_flag(DF_LOG_LL);
1374 if (conf.log_timing_given)
1375 daemon_set_flag(DF_LOG_TIMING);
1376 if (conf.logfile_given) {
1377 daemon_set_logfile(conf.logfile_arg);
1378 daemon_open_log_or_die();
1380 ret = parse_stream_args();
1382 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1385 log_welcome("para_audiod");
1386 set_server_start_time(NULL);
1387 set_initial_status();
1390 setup_signal_handling();
1391 signal_setup_default(sig_task);
1393 init_status_task(stat_task);
1394 init_command_task(cmd_task);
1396 if (conf.daemon_given)
1397 daemonize(false /* parent exits immediately */);
1399 register_task(&sched, &sig_task->task);
1400 register_task(&sched, &cmd_task->task);
1401 register_task(&sched, &stat_task->task);
1402 sched.default_timeout.tv_sec = 2;
1403 sched.default_timeout.tv_usec = 999 * 1000;
1404 ret = schedule(&sched);
1406 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1407 return EXIT_FAILURE;