2 * Copyright (C) 2005-2009 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 */
12 #include <openssl/rc4.h>
18 #include "audiod.cmdline.h"
23 #include "buffer_tree.h"
25 #include "grab_client.h"
26 #include "client.cmdline.h"
34 #include "write_common.h"
37 /** define the array of error lists needed by para_audiod */
39 /** define the array containing all supported audio formats */
40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
42 /** Defines how audiod handles one supported audio format. */
43 struct audio_format_info {
44 /** pointer to the receiver for this audio format */
45 struct receiver *receiver;
46 /** the receiver configuration */
48 /** the number of filters that should be activated for this audio format */
49 unsigned int num_filters;
50 /** Array of filter numbers to be activated. */
51 unsigned *filter_nums;
52 /** Pointer to the array of filter configurations. */
54 /** the number of filters that should be activated for this audio format */
55 unsigned int num_writers;
56 /** Array of writer numbers to be activated. */
58 /** pointer to the array of writer configurations */
60 /** do not start receiver/filters/writer before this time */
61 struct timeval restart_barrier;
65 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
66 * be associated with a receiver/filter/writer triple. This array holds all
67 * information on the status of these slots.
69 * \sa struct slot_info
71 struct slot_info slot[MAX_STREAM_SLOTS];
73 /** The vss status flags audiod is interested in. */
74 enum vss_status_flags {
75 /** Whether the 'N' flag is set. */
76 VSS_STATUS_FLAG_NEXT = 1,
77 /** The 'P' flag is set. */
78 VSS_STATUS_FLAG_PLAYING = 2,
82 * The task for obtaining para_server's status (para_client stat).
84 * \sa struct task, struct sched.
87 /** The associated task structure of audiod. */
89 /** Client data associated with the stat task. */
90 struct client_task *ct;
91 /** Do not restart client command until this time. */
92 struct timeval restart_barrier;
93 /** Last time we received status data from para_server. */
94 struct timeval last_status_read;
95 /** The offset value announced by para_server. */
97 /** The length of the current audio file as announced by para_server. */
99 /** The start of the current stream from the view of para_server. */
100 struct timeval server_stream_start;
101 /** The average time deviation between para_server and para_audiod. */
102 struct timeval sa_time_diff;
103 /** Whether client time is ahead of server time. */
104 int sa_time_diff_sign;
105 /** The 'P' and the 'N' flags as announced by para_server. */
106 enum vss_status_flags vss_status;
107 /** Number of times the clock difference is to be checked. */
108 unsigned clock_diff_count;
109 /** When to start the next check for clock difference. */
110 struct timeval clock_diff_barrier;
111 /** Number of the audio format as announced by para_server. */
112 int current_audio_format_num;
113 /* The status task btrn is the child of the client task. */
114 struct btr_node *btrn;
117 /** The array of status items sent by para_server. */
118 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
121 * the current mode of operation of which can be changed by the on/off/cycle
122 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
124 int audiod_status = AUDIOD_ON;
127 * the gengetopt args_info struct that holds information on all command line
130 struct audiod_args_info conf;
132 static char *socket_name;
133 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
135 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
137 static struct status_task status_task_struct;
140 * the task that calls the status command of para_server
142 * \sa struct status_task
144 static struct status_task *stat_task = &status_task_struct;
145 static struct timeval initial_delay_barrier;
148 * the task for handling audiod commands
150 * \sa struct task, struct sched
152 struct command_task {
153 /** the local listening socket */
155 /** the associated task structure */
159 /** iterate over all supported audio formats */
160 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
163 * get the audio format number
164 * \param name the name of the audio format
166 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
167 * \a name is not a supported audio format.
169 int get_audio_format_num(const char *name)
173 while (para_isspace(*name))
175 FOR_EACH_AUDIO_FORMAT(i)
176 if (!strcmp(name, audio_formats[i]))
178 return -E_UNSUPPORTED_AUDIO_FORMAT;
181 char *get_time_string(int slot_num)
183 int ret, seconds = 0, length;
184 struct timeval *tmp, sum, sss, /* server stream start */
185 rstime, /* receiver start time */
186 wstime, /* writer start time */
187 wtime, /* now - writer start */
188 rskip; /* receiver start - sss */
189 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
192 if (audiod_status == AUDIOD_OFF)
194 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
195 if (stat_task->length_seconds) /* paused */
197 goto empty; /* stopped */
199 if (audiod_status == AUDIOD_ON && !s)
202 * Valid status items and playing, set length and tmp to the stream
203 * start. We use the slot info and fall back to the info from current
204 * status items if no slot info is available.
206 length = stat_task->length_seconds;
207 tmp = &stat_task->server_stream_start;
208 if (s && s->wns) { /* writer active in this slot */
209 btr_get_node_start(s->wns[0].btrn, &wstime);
210 if (wstime.tv_sec != 0) { /* writer wrote something */
211 if (s->server_stream_start.tv_sec == 0) {
212 /* copy status info to slot */
213 s->server_stream_start = stat_task->server_stream_start;
214 s->offset_seconds = stat_task->offset_seconds;
215 s->seconds_total = stat_task->length_seconds;
217 length = s->seconds_total;
218 tmp = &s->server_stream_start;
221 if (stat_task->sa_time_diff_sign > 0)
222 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
224 tv_add(tmp, &stat_task->sa_time_diff, &sss);
227 tv_diff(now, &sss, &diff);
228 seconds = diff.tv_sec + stat_task->offset_seconds;
231 tv_diff(now, &wstime, &wtime);
232 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
233 seconds = s->offset_seconds;
234 btr_get_node_start(s->receiver_node->btrn, &rstime);
235 ret = tv_diff(&rstime, &sss, &rskip);
236 if (ret > 0) { /* audiod was started in the middle of the stream */
237 tv_add(&wtime, &rskip, &sum);
238 seconds += sum.tv_sec;
240 seconds += wtime.tv_sec;
242 seconds = PARA_MIN(seconds, length);
243 seconds = PARA_MAX(seconds, 0);
245 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
249 (length - seconds) / 60,
250 (length - seconds) % 60,
251 length? (seconds * 100 + length / 2) / length : 0,
255 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
258 return para_strdup(NULL);
261 static int want_colors(void)
263 if (conf.color_arg == color_arg_no)
265 if (conf.color_arg == color_arg_yes)
267 if (conf.logfile_given)
269 return isatty(STDERR_FILENO);
272 static void parse_config_or_die(void)
276 struct audiod_cmdline_parser_params params = {
280 .check_ambiguity = 0,
284 if (conf.config_file_given)
285 config_file = para_strdup(conf.config_file_arg);
287 char *home = para_homedir();
288 config_file = make_message("%s/.paraslash/audiod.conf", home);
291 ret = file_exists(config_file);
292 if (conf.config_file_given && !ret) {
293 PARA_EMERG_LOG("can not read config file %s\n", config_file);
297 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
299 daemon_set_loglevel(conf.loglevel_arg);
306 static void setup_signal_handling(void)
308 sig_task->fd = para_signal_init();
309 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
310 para_install_sighandler(SIGINT);
311 para_install_sighandler(SIGTERM);
312 para_install_sighandler(SIGHUP);
313 para_sigaction(SIGPIPE, SIG_IGN);
316 static void clear_slot(int slot_num)
318 struct slot_info *s = &slot[slot_num];
320 PARA_INFO_LOG("clearing slot %d\n", slot_num);
321 memset(s, 0, sizeof(struct slot_info));
325 static void close_receiver(int slot_num)
327 struct slot_info *s = &slot[slot_num];
328 struct audio_format_info *a;
329 struct timeval restart_delay = {0, 200 * 1000};
331 if (s->format < 0 || !s->receiver_node)
334 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
335 audio_formats[s->format], slot_num);
336 a->receiver->close(s->receiver_node);
337 btr_free_node(s->receiver_node->btrn);
338 free(s->receiver_node);
339 s->receiver_node = NULL;
340 tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
343 static void writer_cleanup(struct writer_node *wn)
349 w = writers + wn->writer_num;
350 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
352 btr_free_node(wn->btrn);
355 static void close_writers(struct slot_info *s)
357 struct audio_format_info *a;
364 if (a->num_writers == 0)
365 writer_cleanup(s->wns);
367 for (i = 0; i < a->num_writers; i++)
368 writer_cleanup(s->wns + i);
374 static void close_filters(struct slot_info *s)
377 struct audio_format_info *a = afi + s->format;
378 if (a->num_filters == 0)
380 for (i = 0; i < a->num_filters; i++) {
381 struct filter_node *fn = s->fns + i;
386 f = filters + fn->filter_num;
389 btr_free_node(fn->btrn);
396 * Whenever a task commits suicide by returning from post_select with t->error
397 * < 0, it also removes its btr node. We do exactly that to kill a running
398 * task. Note that the scheduler checks t->error also _before_ each pre/post
399 * select call, so the victim will never be scheduled again.
401 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
406 btr_remove_node(btrn);
409 static void kill_all_decoders(int error)
414 struct slot_info *s = &slot[i];
415 struct audio_format_info *a;
420 for (j = 0; j < a->num_writers; j++)
421 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
423 for (j = 0; j < a->num_writers; j++)
424 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
425 if (s->receiver_node)
426 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
431 static int get_empty_slot(void)
442 if (s->wns || s->receiver_node || s->fns)
447 return -E_NO_MORE_SLOTS;
451 * get the number of filters
453 * \param audio_format_num the number identifying the audio format
455 * \return the number of filters for the given audio format
459 int num_filters(int audio_format_num)
461 return afi[audio_format_num].num_filters;
464 static void open_filters(struct slot_info *s)
466 struct audio_format_info *a = afi + s->format;
467 struct filter_node *fn;
468 int nf = a->num_filters;
469 struct btr_node *parent;
474 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
475 assert(s->fns == NULL);
476 s->fns = para_calloc(nf * sizeof(struct filter_node));
477 parent = s->receiver_node->btrn;
478 for (i = 0; i < nf; i++) {
479 struct filter *f = filters + a->filter_nums[i];
481 fn->filter_num = a->filter_nums[i];
482 fn->conf = a->filter_conf[i];
483 fn->task.pre_select = f->pre_select;
484 fn->task.post_select = f->post_select;
486 fn->btrn = btr_new_node(&(struct btr_node_description)
487 EMBRACE(.name = f->name, .parent = parent,
488 .handler = f->execute, .context = fn));
491 register_task(&fn->task);
493 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
494 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
495 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
499 static void open_writers(struct slot_info *s)
502 struct audio_format_info *a = afi + s->format;
503 struct writer_node *wn;
504 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
506 assert(s->wns == NULL);
507 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
508 * sizeof(struct writer_node));
509 if (a->num_writers == 0)
510 setup_writer_node(NULL, parent, s->wns);
512 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
513 for (i = 0; i < a->num_writers; i++) {
515 wn->conf = a->writer_conf[i];
516 wn->writer_num = a->writer_nums[i];
517 register_writer_node(wn, parent);
522 /* returns slot num on success */
523 static int open_receiver(int format)
525 struct audio_format_info *a = &afi[format];
528 struct receiver *r = a->receiver;
529 struct receiver_node *rn;
530 const struct timeval restart_delay = {2, 0};
532 ret = get_empty_slot();
538 s->receiver_node = para_calloc(sizeof(struct receiver_node));
539 rn = s->receiver_node;
541 rn->conf = a->receiver_conf;
542 rn->btrn = btr_new_node(&(struct btr_node_description)
543 EMBRACE(.name = r->name, .context = rn));
546 btr_free_node(rn->btrn);
548 s->receiver_node = NULL;
551 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
552 audio_formats[s->format], r->name, slot_num);
553 rn->task.pre_select = r->pre_select;
554 rn->task.post_select = r->post_select;
555 sprintf(rn->task.status, "%s receiver node", r->name);
556 register_task(&rn->task);
560 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
561 tv_add(now, &restart_delay, &afi[format].restart_barrier);
565 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
566 static int receiver_running(int format)
571 struct slot_info *s = &slot[i];
572 if (s->format != format)
574 if (!s->receiver_node)
576 if (s->receiver_node->task.error >= 0)
583 struct btr_node *audiod_get_btr_root(void)
585 int i, newest_slot = -1;
586 struct timeval newest_rstime = {0, 0};
589 struct slot_info *s = &slot[i];
590 struct timeval rstime;
591 if (!s->receiver_node)
593 if (s->receiver_node->task.error < 0)
595 btr_get_node_start(s->receiver_node->btrn, &rstime);
596 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
598 newest_rstime = rstime;
601 if (newest_slot == -1)
603 return slot[newest_slot].receiver_node->btrn;
606 /* returns slot num on success. */
607 static int open_current_receiver(void)
609 int ret, cafn = stat_task->current_audio_format_num;
611 if (cafn < 0 || !stat_task->ct)
613 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
614 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
616 ret = receiver_running(cafn);
617 if (ret != 0) /* already running */
619 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
621 /* start a new receiver */
622 return open_receiver(cafn);
625 static unsigned compute_time_diff(const struct timeval *status_time)
627 struct timeval tmp, diff;
628 static unsigned count;
629 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
630 const struct timeval max_deviation = {0, 500 * 1000};
631 const int time_smooth = 5;
635 sign = tv_diff(status_time, now, &diff);
636 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
637 // sign, sa_time_diff_sign);
639 sa_time_diff_sign = sign;
640 stat_task->sa_time_diff = diff;
645 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
646 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
647 PARA_WARNING_LOG("time diff jump: %lims\n",
651 sa_time_diff_sign = tv_convex_combination(
652 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
653 count > 10? sign : sign * time_smooth, &diff,
655 stat_task->sa_time_diff = tmp;
656 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
659 sa_time_diff_sign ? "+" : "-",
660 tv2ms(&stat_task->sa_time_diff)
663 stat_task->sa_time_diff_sign = sa_time_diff_sign;
667 static int update_item(int itemnum, char *buf)
669 long unsigned sec, usec;
671 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
673 free(stat_item_values[itemnum]);
674 stat_item_values[itemnum] = para_strdup(buf);
675 stat_client_write_item(itemnum);
677 case SI_STATUS_FLAGS:
678 stat_task->vss_status = 0;
679 if (strchr(buf, 'N'))
680 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
681 if (strchr(buf, 'P'))
682 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
685 stat_task->offset_seconds = atoi(buf);
687 case SI_SECONDS_TOTAL:
688 stat_task->length_seconds = atoi(buf);
690 case SI_STREAM_START:
691 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
692 struct timeval a_start, delay;
693 delay.tv_sec = conf.stream_delay_arg / 1000;
694 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
695 stat_task->server_stream_start.tv_sec = sec;
696 stat_task->server_stream_start.tv_usec = usec;
697 if (compute_time_diff(NULL) > 2) {
698 if (stat_task->sa_time_diff_sign < 0)
699 tv_add(&stat_task->server_stream_start,
700 &stat_task->sa_time_diff, &a_start);
702 tv_diff(&stat_task->server_stream_start,
703 &stat_task->sa_time_diff, &a_start);
704 tv_add(&a_start, &delay, &initial_delay_barrier);
708 case SI_CURRENT_TIME:
709 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
710 struct timeval tv = {sec, usec};
711 compute_time_diff(&tv);
715 stat_task->current_audio_format_num
716 = get_audio_format_num(buf);
721 static int parse_stream_command(const char *txt, char **cmd)
723 char *p = strchr(txt, ':');
727 return -E_MISSING_COLON;
729 FOR_EACH_AUDIO_FORMAT(i) {
730 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
735 return -E_UNSUPPORTED_AUDIO_FORMAT;
738 static int add_filter(int format, char *cmdline)
740 struct audio_format_info *a = &afi[format];
741 int filter_num, nf = a->num_filters;
743 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
746 a->filter_nums[nf] = filter_num;
748 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
749 filters[filter_num].name);
753 static int parse_writer_args(void)
757 struct audio_format_info *a;
759 nw = PARA_MAX(1U, conf.writer_given);
760 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
761 FOR_EACH_AUDIO_FORMAT(i) {
763 a->writer_conf = para_malloc(nw * sizeof(void *));
764 a->writer_nums = para_malloc(nw * sizeof(int));
767 for (i = 0; i < conf.writer_given; i++) {
770 ret = parse_stream_command(conf.writer_arg[i], &cmd);
775 wconf = check_writer_arg(cmd, &writer_num);
780 a->writer_nums[nw] = writer_num;
781 a->writer_conf[nw] = wconf;
782 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
783 nw, writer_names[writer_num]);
791 static int parse_receiver_args(void)
793 int i, ret, receiver_num;
795 struct audio_format_info *a;
797 for (i = conf.receiver_given - 1; i >= 0; i--) {
798 char *arg = conf.receiver_arg[i];
799 char *recv_arg = strchr(arg, ':');
800 ret = -E_MISSING_COLON;
805 ret = get_audio_format_num(arg);
808 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
809 if (!afi[ret].receiver_conf) {
810 ret = -E_RECV_SYNTAX;
813 afi[ret].receiver = &receivers[receiver_num];
815 /* use the first available receiver with no arguments
816 * for those audio formats for which no receiver
819 cmd = para_strdup(receivers[0].name);
820 FOR_EACH_AUDIO_FORMAT(i) {
822 if (a->receiver_conf)
824 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
825 if (!a->receiver_conf)
826 return -E_RECV_SYNTAX;
827 a->receiver = &receivers[receiver_num];
835 static int init_default_filters(void)
839 FOR_EACH_AUDIO_FORMAT(i) {
840 struct audio_format_info *a = &afi[i];
845 continue; /* no default -- nothing to to */
846 /* add "dec" to audio format name */
847 tmp = make_message("%sdec", audio_formats[i]);
848 for (j = 0; filters[j].name; j++)
849 if (!strcmp(tmp, filters[j].name))
852 ret = -E_UNSUPPORTED_FILTER;
853 if (!filters[j].name)
855 tmp = para_strdup(filters[j].name);
856 ret = add_filter(i, tmp);
860 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
867 static int parse_filter_args(void)
871 nf = PARA_MAX(1U, conf.filter_given);
872 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
873 FOR_EACH_AUDIO_FORMAT(i) {
874 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
875 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
877 if (!conf.no_default_filters_given)
878 return init_default_filters();
879 for (i = 0; i < conf.filter_given; i++) {
880 char *arg = conf.filter_arg[i];
881 char *filter_name = strchr(arg, ':');
882 ret = -E_MISSING_COLON;
887 ret = get_audio_format_num(arg);
890 ret = add_filter(ret, filter_name);
894 ret = init_default_filters(); /* use default values for the rest */
899 static int parse_stream_args(void)
903 ret = parse_receiver_args();
906 ret = parse_filter_args();
909 ret = parse_writer_args();
915 /* does not unlink socket on errors */
916 static int audiod_get_socket(void)
918 struct sockaddr_un unix_addr;
921 if (conf.socket_given)
922 socket_name = para_strdup(conf.socket_arg);
924 char *hn = para_hostname();
925 socket_name = make_message("/var/paraslash/audiod_socket.%s",
929 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
930 if (conf.force_given)
932 ret = create_local_socket(socket_name, &unix_addr,
933 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
937 if (listen(fd , 5) < 0) {
938 ret = -ERRNO_TO_PARA_ERROR(errno);
941 ret = mark_fd_nonblocking(fd);
946 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
950 static void signal_pre_select(struct sched *s, struct task *t)
952 struct signal_task *st = container_of(t, struct signal_task, task);
953 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
956 static void signal_post_select(struct sched *s, struct task *t)
958 struct signal_task *st = container_of(t, struct signal_task, task);
960 if (!FD_ISSET(st->fd, &s->rfds))
963 st->signum = para_next_signal();
964 switch (st->signum) {
968 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
969 clean_exit(EXIT_FAILURE, "caught deadly signal");
973 static void signal_setup_default(struct signal_task *st)
975 st->task.pre_select = signal_pre_select;
976 st->task.post_select = signal_post_select;
977 sprintf(st->task.status, "signal task");
980 static void command_pre_select(struct sched *s, struct task *t)
982 struct command_task *ct = container_of(t, struct command_task, task);
983 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
986 static void command_post_select(struct sched *s, struct task *t)
989 struct command_task *ct = container_of(t, struct command_task, task);
990 static struct timeval last_status_dump;
991 struct timeval tmp, delay = {0, 500 * 1000};
993 tv_add(&last_status_dump, &delay, &tmp);
994 if (tv_diff(&tmp, now, NULL) < 0) {
995 audiod_status_dump();
996 last_status_dump = *now;
999 if (!FD_ISSET(ct->fd, &s->rfds))
1001 ret = handle_connect(ct->fd);
1003 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1006 static void init_command_task(struct command_task *ct)
1008 ct->task.pre_select = command_pre_select;
1009 ct->task.post_select = command_post_select;
1011 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1012 sprintf(ct->task.status, "command task");
1015 static void close_stat_pipe(void)
1019 btr_free_node(stat_task->ct->btrn);
1020 client_close(stat_task->ct);
1021 stat_task->ct = NULL;
1022 clear_and_dump_items();
1023 stat_task->length_seconds = 0;
1024 stat_task->offset_seconds = 0;
1025 stat_task->vss_status = 0;
1026 stat_task->current_audio_format_num = -1;
1027 audiod_status_dump();
1031 * close the connection to para_server and exit
1033 * \param status the exit status which is passed to exit(3)
1034 * \param msg the log message
1036 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1037 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1042 void __noreturn clean_exit(int status, const char *msg)
1044 PARA_EMERG_LOG("%s\n", msg);
1046 unlink(socket_name);
1051 /* avoid busy loop if server is down */
1052 static void set_stat_task_restart_barrier(unsigned seconds)
1054 struct timeval delay = {seconds, 0};
1055 tv_add(now, &delay, &stat_task->restart_barrier);
1058 static void try_to_close_slot(int slot_num)
1060 struct slot_info *s = &slot[slot_num];
1061 struct audio_format_info *a = afi + s->format;
1066 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1068 for (i = 0; i < a->num_filters; i++)
1069 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1071 if (a->num_writers > 0) {
1072 for (i = 0; i < a->num_writers; i++)
1073 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1076 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1079 PARA_INFO_LOG("closing slot %d\n", slot_num);
1082 close_receiver(slot_num);
1083 clear_slot(slot_num);
1087 * Check if any receivers/filters/writers need to be started and do so if
1090 static void start_stop_decoders(void)
1093 struct slot_info *sl;
1094 struct audio_format_info *a;
1097 try_to_close_slot(i);
1098 if (audiod_status != AUDIOD_ON ||
1099 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1100 return kill_all_decoders(-E_NOT_PLAYING);
1101 ret = open_current_receiver();
1105 a = afi + sl->format;
1109 activate_grab_clients();
1110 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1113 static void status_pre_select(struct sched *s, struct task *t)
1115 struct status_task *st = container_of(t, struct status_task, task);
1118 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1119 sched_request_barrier(&st->restart_barrier, s);
1122 /* restart the client task if necessary */
1123 static void status_post_select(__a_unused struct sched *s, struct task *t)
1125 struct status_task *st = container_of(t, struct status_task, task);
1127 if (audiod_status == AUDIOD_OFF) {
1130 if (st->ct->task.error >= 0) {
1131 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1134 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1137 st->clock_diff_count = conf.clock_diff_count_arg;
1144 if (st->ct->task.error < 0) {
1145 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1150 if (st->ct->status != CL_RECEIVING)
1152 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1155 sz = btr_next_buffer(st->btrn, &buf);
1156 ret = for_each_stat_item(buf, sz, update_item);
1158 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1162 st->last_status_read = *now;
1164 struct timeval diff;
1165 tv_diff(now, &st->last_status_read, &diff);
1166 if (diff.tv_sec > 61)
1167 kill_btrn(st->ct->btrn, &st->ct->task,
1170 btr_consume(st->btrn, sz - ret);
1173 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1175 if (st->clock_diff_count) { /* get status only one time */
1176 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1178 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1179 st->clock_diff_count--;
1180 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1181 set_stat_task_restart_barrier(2);
1184 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1186 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1187 set_stat_task_restart_barrier(5);
1189 free(stat_item_values[SI_BASENAME]);
1190 stat_item_values[SI_BASENAME] = para_strdup(
1191 "no connection to para_server");
1192 stat_client_write_item(SI_BASENAME);
1193 st->last_status_read = *now;
1195 start_stop_decoders();
1198 static void init_status_task(struct status_task *st)
1200 memset(st, 0, sizeof(struct status_task));
1201 st->task.pre_select = status_pre_select;
1202 st->task.post_select = status_post_select;
1203 st->sa_time_diff_sign = 1;
1204 st->clock_diff_count = conf.clock_diff_count_arg;
1205 st->current_audio_format_num = -1;
1206 sprintf(st->task.status, "stat");
1207 st->btrn = btr_new_node(&(struct btr_node_description)
1208 EMBRACE(.name = "stat"));
1211 static void set_initial_status(void)
1213 audiod_status = AUDIOD_ON;
1214 if (!conf.mode_given)
1216 if (!strcmp(conf.mode_arg, "sb")) {
1217 audiod_status = AUDIOD_STANDBY;
1220 if (!strcmp(conf.mode_arg, "off")) {
1221 audiod_status = AUDIOD_OFF;
1224 if (strcmp(conf.mode_arg, "on"))
1225 PARA_WARNING_LOG("invalid mode\n");
1228 __noreturn static void print_help_and_die(void)
1230 int d = conf.detailed_help_given;
1231 const char **p = d? audiod_args_info_detailed_help
1232 : audiod_args_info_help;
1234 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1235 AUDIOD_CMDLINE_PARSER_VERSION);
1236 printf_or_die("%s\n\n", audiod_args_info_usage);
1238 printf_or_die("%s\n", *p);
1239 print_receiver_helps(d);
1240 print_filter_helps(d);
1241 print_writer_helps(d);
1245 static void init_colors_or_die(void)
1251 daemon_set_default_log_colors();
1252 daemon_set_flag(DF_COLOR_LOG);
1253 for (i = 0; i < conf.log_color_given; i++) {
1254 ret = daemon_set_log_color(conf.log_color_arg[i]);
1261 * the main function of para_audiod
1263 * \param argc usual argument count
1264 * \param argv usual argument vector
1266 * \return EXIT_SUCCESS or EXIT_FAILURE
1268 * \sa para_audiod(1)
1270 int main(int argc, char *argv[])
1273 static struct sched s;
1274 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1275 struct audiod_cmdline_parser_params params = {
1278 .check_required = 0,
1279 .check_ambiguity = 0,
1284 if (audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms))
1286 HANDLE_VERSION_FLAG("audiod", conf);
1287 /* init receivers/filters/writers early to make help work */
1291 if (conf.help_given || conf.detailed_help_given)
1292 print_help_and_die();
1293 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1294 parse_config_or_die();
1295 init_colors_or_die();
1296 init_random_seed_or_die();
1297 daemon_set_flag(DF_LOG_TIME);
1298 daemon_set_flag(DF_LOG_HOSTNAME);
1299 daemon_set_flag(DF_LOG_LL);
1300 if (conf.log_timing_given)
1301 daemon_set_flag(DF_LOG_TIMING);
1302 if (conf.logfile_given) {
1303 daemon_set_logfile(conf.logfile_arg);
1304 daemon_open_log_or_die();
1306 ret = parse_stream_args();
1308 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1311 log_welcome("para_audiod");
1312 server_uptime(UPTIME_SET);
1313 set_initial_status();
1316 setup_signal_handling();
1317 signal_setup_default(sig_task);
1319 init_status_task(stat_task);
1320 init_command_task(cmd_task);
1322 if (conf.daemon_given)
1325 register_task(&sig_task->task);
1326 register_task(&cmd_task->task);
1327 register_task(&stat_task->task);
1328 s.default_timeout.tv_sec = 2;
1329 s.default_timeout.tv_usec = 999 * 1000;
1332 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1333 return EXIT_FAILURE;