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;
147 * the task for handling audiod commands
149 * \sa struct task, struct sched
151 struct command_task {
152 /** the local listening socket */
154 /** the associated task structure */
158 /** iterate over all supported audio formats */
159 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
162 * 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;
182 * Compute the play time based on information of the given slot.
184 * \param slot_num The slot number (negative means: no slot).
186 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
187 * from the status items received from para_server and the start time of the
188 * (first) writer of the given slot.
190 * It has to to take into account that probably the stream was not started at
191 * the beginning of the file, that the clock between the server and the client
192 * host may differ and that playback of the stream was delayed, e.g. because
193 * the prebuffer filter is used in the filter chain of the given slot.
195 * If no writer is active in the given slot, or \a slot_num is negative
196 * (indicating that para_audiod runs in standby mode), an approximation based
197 * only on the status items is computed and the returned string is prefixed
200 * \return A string that must be freed by the caller.
202 char *get_time_string(int slot_num)
204 int ret, seconds = 0, length;
205 struct timeval *tmp, sum, sss, /* server stream start */
206 rstime, /* receiver start time */
207 wstime, /* writer start time */
208 wtime, /* now - writer start */
209 rskip; /* receiver start - sss */
210 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
213 if (audiod_status == AUDIOD_OFF)
215 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
216 if (stat_task->length_seconds) /* paused */
218 goto empty; /* stopped */
220 if (audiod_status == AUDIOD_ON && !s)
223 * Valid status items and playing, set length and tmp to the stream
224 * start. We use the slot info and fall back to the info from current
225 * status items if no slot info is available.
227 length = stat_task->length_seconds;
228 tmp = &stat_task->server_stream_start;
229 if (s && s->wns) { /* writer active in this slot */
230 btr_get_node_start(s->wns[0].btrn, &wstime);
231 if (wstime.tv_sec != 0) { /* writer wrote something */
232 if (s->server_stream_start.tv_sec == 0) {
233 /* copy status info to slot */
234 s->server_stream_start = stat_task->server_stream_start;
235 s->offset_seconds = stat_task->offset_seconds;
236 s->seconds_total = stat_task->length_seconds;
238 length = s->seconds_total;
239 tmp = &s->server_stream_start;
242 if (stat_task->sa_time_diff_sign > 0)
243 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
245 tv_add(tmp, &stat_task->sa_time_diff, &sss);
248 tv_diff(now, &sss, &diff);
249 seconds = diff.tv_sec + stat_task->offset_seconds;
252 tv_diff(now, &wstime, &wtime);
253 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
254 seconds = s->offset_seconds;
255 btr_get_node_start(s->receiver_node->btrn, &rstime);
256 ret = tv_diff(&rstime, &sss, &rskip);
257 if (ret > 0) { /* audiod was started in the middle of the stream */
258 tv_add(&wtime, &rskip, &sum);
259 seconds += sum.tv_sec;
261 seconds += wtime.tv_sec;
263 seconds = PARA_MIN(seconds, length);
264 seconds = PARA_MAX(seconds, 0);
266 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
270 (length - seconds) / 60,
271 (length - seconds) % 60,
272 length? (seconds * 100 + length / 2) / length : 0,
276 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
279 return para_strdup(NULL);
282 static int want_colors(void)
284 if (conf.color_arg == color_arg_no)
286 if (conf.color_arg == color_arg_yes)
288 if (conf.logfile_given)
290 return isatty(STDERR_FILENO);
293 static void parse_config_or_die(void)
297 struct audiod_cmdline_parser_params params = {
301 .check_ambiguity = 0,
305 if (conf.config_file_given)
306 config_file = para_strdup(conf.config_file_arg);
308 char *home = para_homedir();
309 config_file = make_message("%s/.paraslash/audiod.conf", home);
312 ret = file_exists(config_file);
313 if (conf.config_file_given && !ret) {
314 PARA_EMERG_LOG("can not read config file %s\n", config_file);
318 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
320 daemon_set_loglevel(conf.loglevel_arg);
327 static void setup_signal_handling(void)
329 sig_task->fd = para_signal_init();
330 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
331 para_install_sighandler(SIGINT);
332 para_install_sighandler(SIGTERM);
333 para_install_sighandler(SIGHUP);
334 para_sigaction(SIGPIPE, SIG_IGN);
337 static void clear_slot(int slot_num)
339 struct slot_info *s = &slot[slot_num];
341 PARA_INFO_LOG("clearing slot %d\n", slot_num);
342 memset(s, 0, sizeof(struct slot_info));
346 static void close_receiver(int slot_num)
348 struct slot_info *s = &slot[slot_num];
349 struct audio_format_info *a;
351 if (s->format < 0 || !s->receiver_node)
354 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
355 audio_formats[s->format], slot_num);
356 a->receiver->close(s->receiver_node);
357 btr_free_node(s->receiver_node->btrn);
358 free(s->receiver_node);
359 s->receiver_node = NULL;
362 static void writer_cleanup(struct writer_node *wn)
368 w = writers + wn->writer_num;
369 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
371 btr_free_node(wn->btrn);
374 static void close_writers(struct slot_info *s)
376 struct audio_format_info *a;
383 if (a->num_writers == 0)
384 writer_cleanup(s->wns);
386 for (i = 0; i < a->num_writers; i++)
387 writer_cleanup(s->wns + i);
393 static void close_filters(struct slot_info *s)
396 struct audio_format_info *a = afi + s->format;
397 if (a->num_filters == 0)
399 for (i = 0; i < a->num_filters; i++) {
400 struct filter_node *fn = s->fns + i;
405 f = filters + fn->filter_num;
408 btr_free_node(fn->btrn);
415 * Whenever a task commits suicide by returning from post_select with t->error
416 * < 0, it also removes its btr node. We do exactly that to kill a running
417 * task. Note that the scheduler checks t->error also _before_ each pre/post
418 * select call, so the victim will never be scheduled again.
420 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
425 btr_remove_node(btrn);
428 static void kill_all_decoders(int error)
433 struct slot_info *s = &slot[i];
434 struct audio_format_info *a;
439 for (j = 0; j < a->num_writers; j++)
440 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
442 for (j = 0; j < a->num_writers; j++)
443 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
444 if (s->receiver_node)
445 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
450 static int get_empty_slot(void)
461 if (s->wns || s->receiver_node || s->fns)
466 return -E_NO_MORE_SLOTS;
470 * get the number of filters
472 * \param audio_format_num the number identifying the audio format
474 * \return the number of filters for the given audio format
478 int num_filters(int audio_format_num)
480 return afi[audio_format_num].num_filters;
483 static void open_filters(struct slot_info *s)
485 struct audio_format_info *a = afi + s->format;
486 struct filter_node *fn;
487 int nf = a->num_filters;
488 struct btr_node *parent;
493 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
494 assert(s->fns == NULL);
495 s->fns = para_calloc(nf * sizeof(struct filter_node));
496 parent = s->receiver_node->btrn;
497 for (i = 0; i < nf; i++) {
498 struct filter *f = filters + a->filter_nums[i];
500 fn->filter_num = a->filter_nums[i];
501 fn->conf = a->filter_conf[i];
502 fn->task.pre_select = f->pre_select;
503 fn->task.post_select = f->post_select;
505 fn->btrn = btr_new_node(&(struct btr_node_description)
506 EMBRACE(.name = f->name, .parent = parent,
507 .handler = f->execute, .context = fn));
510 register_task(&fn->task);
512 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
513 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
514 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
518 static void open_writers(struct slot_info *s)
521 struct audio_format_info *a = afi + s->format;
522 struct writer_node *wn;
523 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
525 assert(s->wns == NULL);
526 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
527 * sizeof(struct writer_node));
528 if (a->num_writers == 0)
529 setup_writer_node(NULL, parent, s->wns);
531 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
532 for (i = 0; i < a->num_writers; i++) {
534 wn->conf = a->writer_conf[i];
535 wn->writer_num = a->writer_nums[i];
536 register_writer_node(wn, parent);
541 /* returns slot num on success */
542 static int open_receiver(int format)
544 struct audio_format_info *a = &afi[format];
547 struct receiver *r = a->receiver;
548 struct receiver_node *rn;
550 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
551 ret = get_empty_slot();
555 rn = para_calloc(sizeof(*rn));
557 rn->conf = a->receiver_conf;
558 rn->btrn = btr_new_node(&(struct btr_node_description)
559 EMBRACE(.name = r->name, .context = rn));
562 btr_free_node(rn->btrn);
568 s->receiver_node = rn;
569 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
570 audio_formats[format], r->name, slot_num);
571 rn->task.pre_select = r->pre_select;
572 rn->task.post_select = r->post_select;
573 sprintf(rn->task.status, "%s receiver node", r->name);
574 register_task(&rn->task);
578 static bool receiver_running(void)
581 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
584 struct slot_info *s = &slot[i];
585 long unsigned ss2 = s->server_stream_start.tv_sec;
587 if (!s->receiver_node)
589 if (s->receiver_node->task.error >= 0)
598 * Return the root node of the current buffer tree.
600 * This is only used for stream grabbing.
602 * \return \p NULL if no slot is currently active. If more than one buffer tree
603 * exists, the node corresponding to the most recently started receiver is
606 struct btr_node *audiod_get_btr_root(void)
608 int i, newest_slot = -1;
609 struct timeval newest_rstime = {0, 0};
612 struct slot_info *s = &slot[i];
613 struct timeval rstime;
614 if (!s->receiver_node)
616 if (s->receiver_node->task.error < 0)
618 btr_get_node_start(s->receiver_node->btrn, &rstime);
619 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
621 newest_rstime = rstime;
624 if (newest_slot == -1)
626 return slot[newest_slot].receiver_node->btrn;
629 /* whether a new instance of a decoder should be started. */
630 static bool must_start_decoder(void)
632 int cafn = stat_task->current_audio_format_num;
633 unsigned vs = stat_task->vss_status;
639 if (vs & VSS_STATUS_FLAG_NEXT)
641 if (!(vs & VSS_STATUS_FLAG_PLAYING))
643 if (receiver_running())
645 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
650 static unsigned compute_time_diff(const struct timeval *status_time)
652 struct timeval tmp, diff;
653 static unsigned count;
654 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
655 const struct timeval max_deviation = {0, 500 * 1000};
656 const int time_smooth = 5;
660 sign = tv_diff(status_time, now, &diff);
661 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
662 // sign, sa_time_diff_sign);
664 sa_time_diff_sign = sign;
665 stat_task->sa_time_diff = diff;
670 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
671 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
672 PARA_WARNING_LOG("time diff jump: %lims\n",
676 sa_time_diff_sign = tv_convex_combination(
677 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
678 count > 10? sign : sign * time_smooth, &diff,
680 stat_task->sa_time_diff = tmp;
681 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
684 sa_time_diff_sign < 0? "-" : "+",
685 tv2ms(&stat_task->sa_time_diff)
688 stat_task->sa_time_diff_sign = sa_time_diff_sign;
692 static int update_item(int itemnum, char *buf)
694 long unsigned sec, usec;
696 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
698 free(stat_item_values[itemnum]);
699 stat_item_values[itemnum] = para_strdup(buf);
700 stat_client_write_item(itemnum);
702 case SI_STATUS_FLAGS:
703 stat_task->vss_status = 0;
704 if (strchr(buf, 'N'))
705 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
706 if (strchr(buf, 'P'))
707 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
710 stat_task->offset_seconds = atoi(buf);
712 case SI_SECONDS_TOTAL:
713 stat_task->length_seconds = atoi(buf);
715 case SI_STREAM_START:
716 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
717 stat_task->server_stream_start.tv_sec = sec;
718 stat_task->server_stream_start.tv_usec = usec;
721 case SI_CURRENT_TIME:
722 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
723 struct timeval tv = {sec, usec};
724 compute_time_diff(&tv);
728 stat_task->current_audio_format_num
729 = get_audio_format_num(buf);
734 static int parse_stream_command(const char *txt, char **cmd)
736 char *p = strchr(txt, ':');
740 return -E_MISSING_COLON;
742 FOR_EACH_AUDIO_FORMAT(i) {
743 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
748 return -E_UNSUPPORTED_AUDIO_FORMAT;
751 static int add_filter(int format, char *cmdline)
753 struct audio_format_info *a = &afi[format];
754 int filter_num, nf = a->num_filters;
756 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
759 a->filter_nums[nf] = filter_num;
761 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
762 filters[filter_num].name);
766 static int parse_writer_args(void)
770 struct audio_format_info *a;
772 nw = PARA_MAX(1U, conf.writer_given);
773 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
774 FOR_EACH_AUDIO_FORMAT(i) {
776 a->writer_conf = para_malloc(nw * sizeof(void *));
777 a->writer_nums = para_malloc(nw * sizeof(int));
780 for (i = 0; i < conf.writer_given; i++) {
783 ret = parse_stream_command(conf.writer_arg[i], &cmd);
788 wconf = check_writer_arg(cmd, &writer_num);
793 a->writer_nums[nw] = writer_num;
794 a->writer_conf[nw] = wconf;
795 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
796 nw, writer_names[writer_num]);
804 static int parse_receiver_args(void)
806 int i, ret, receiver_num;
808 struct audio_format_info *a;
810 for (i = conf.receiver_given - 1; i >= 0; i--) {
811 char *arg = conf.receiver_arg[i];
812 char *recv_arg = strchr(arg, ':');
813 ret = -E_MISSING_COLON;
818 ret = get_audio_format_num(arg);
821 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
822 if (!afi[ret].receiver_conf) {
823 ret = -E_RECV_SYNTAX;
826 afi[ret].receiver = &receivers[receiver_num];
828 /* use the first available receiver with no arguments
829 * for those audio formats for which no receiver
832 cmd = para_strdup(receivers[0].name);
833 FOR_EACH_AUDIO_FORMAT(i) {
835 if (a->receiver_conf)
837 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
838 if (!a->receiver_conf)
839 return -E_RECV_SYNTAX;
840 a->receiver = &receivers[receiver_num];
848 static int init_default_filters(void)
852 FOR_EACH_AUDIO_FORMAT(i) {
853 struct audio_format_info *a = &afi[i];
858 continue; /* no default -- nothing to to */
860 * If udp is used to receive this audiod format, add fecdec as
863 if (strcmp(afi[i].receiver->name, "udp") == 0) {
864 tmp = para_strdup("fecdec");
870 /* add "dec" to audio format name */
871 tmp = make_message("%sdec", audio_formats[i]);
872 for (j = 0; filters[j].name; j++)
873 if (!strcmp(tmp, filters[j].name))
876 ret = -E_UNSUPPORTED_FILTER;
877 if (!filters[j].name)
879 tmp = para_strdup(filters[j].name);
880 ret = add_filter(i, tmp);
884 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
891 static int parse_filter_args(void)
895 nf = PARA_MAX(2U, conf.filter_given);
896 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
897 FOR_EACH_AUDIO_FORMAT(i) {
898 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
899 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
901 if (!conf.no_default_filters_given)
902 return init_default_filters();
903 for (i = 0; i < conf.filter_given; i++) {
904 char *arg = conf.filter_arg[i];
905 char *filter_name = strchr(arg, ':');
906 ret = -E_MISSING_COLON;
911 ret = get_audio_format_num(arg);
914 ret = add_filter(ret, filter_name);
918 ret = init_default_filters(); /* use default values for the rest */
923 static int parse_stream_args(void)
927 ret = parse_receiver_args();
930 ret = parse_filter_args();
933 ret = parse_writer_args();
939 /* does not unlink socket on errors */
940 static int audiod_get_socket(void)
942 struct sockaddr_un unix_addr;
945 if (conf.socket_given)
946 socket_name = para_strdup(conf.socket_arg);
948 char *hn = para_hostname();
949 socket_name = make_message("/var/paraslash/audiod_socket.%s",
953 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
954 if (conf.force_given)
956 ret = create_local_socket(socket_name, &unix_addr,
957 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
961 if (listen(fd , 5) < 0) {
962 ret = -ERRNO_TO_PARA_ERROR(errno);
965 ret = mark_fd_nonblocking(fd);
970 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
974 static void signal_pre_select(struct sched *s, struct task *t)
976 struct signal_task *st = container_of(t, struct signal_task, task);
977 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
980 static void signal_post_select(struct sched *s, struct task *t)
982 struct signal_task *st = container_of(t, struct signal_task, task);
984 if (!FD_ISSET(st->fd, &s->rfds))
987 st->signum = para_next_signal();
988 switch (st->signum) {
992 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
993 clean_exit(EXIT_FAILURE, "caught deadly signal");
997 static void signal_setup_default(struct signal_task *st)
999 st->task.pre_select = signal_pre_select;
1000 st->task.post_select = signal_post_select;
1001 sprintf(st->task.status, "signal task");
1004 static void command_pre_select(struct sched *s, struct task *t)
1006 struct command_task *ct = container_of(t, struct command_task, task);
1007 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1010 static void command_post_select(struct sched *s, struct task *t)
1013 struct command_task *ct = container_of(t, struct command_task, task);
1014 static struct timeval last_status_dump;
1015 struct timeval tmp, delay = {0, 500 * 1000};
1017 tv_add(&last_status_dump, &delay, &tmp);
1018 if (tv_diff(&tmp, now, NULL) < 0) {
1019 audiod_status_dump();
1020 last_status_dump = *now;
1023 if (!FD_ISSET(ct->fd, &s->rfds))
1025 ret = handle_connect(ct->fd);
1027 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1030 static void init_command_task(struct command_task *ct)
1032 ct->task.pre_select = command_pre_select;
1033 ct->task.post_select = command_post_select;
1035 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1036 sprintf(ct->task.status, "command task");
1039 static void close_stat_pipe(void)
1043 btr_free_node(stat_task->ct->btrn);
1044 client_close(stat_task->ct);
1045 stat_task->ct = NULL;
1046 clear_and_dump_items();
1047 stat_task->length_seconds = 0;
1048 stat_task->offset_seconds = 0;
1049 stat_task->vss_status = 0;
1050 stat_task->current_audio_format_num = -1;
1051 audiod_status_dump();
1055 * close the connection to para_server and exit
1057 * \param status the exit status which is passed to exit(3)
1058 * \param msg the log message
1060 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1061 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1066 void __noreturn clean_exit(int status, const char *msg)
1068 PARA_EMERG_LOG("%s\n", msg);
1070 unlink(socket_name);
1075 /* avoid busy loop if server is down */
1076 static void set_stat_task_restart_barrier(unsigned seconds)
1078 struct timeval delay = {seconds, 0};
1079 tv_add(now, &delay, &stat_task->restart_barrier);
1082 static void try_to_close_slot(int slot_num)
1084 struct slot_info *s = &slot[slot_num];
1085 struct audio_format_info *a = afi + s->format;
1090 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1092 for (i = 0; i < a->num_filters; i++)
1093 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1095 if (a->num_writers > 0) {
1096 for (i = 0; i < a->num_writers; i++)
1097 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1100 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1103 PARA_INFO_LOG("closing slot %d\n", slot_num);
1106 close_receiver(slot_num);
1107 clear_slot(slot_num);
1111 * Check if any receivers/filters/writers need to be started and do so if
1114 static void start_stop_decoders(void)
1117 struct slot_info *sl;
1118 struct audio_format_info *a;
1121 try_to_close_slot(i);
1122 if (audiod_status != AUDIOD_ON ||
1123 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1124 return kill_all_decoders(-E_NOT_PLAYING);
1125 if (!must_start_decoder())
1127 ret = open_receiver(stat_task->current_audio_format_num);
1129 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1133 a = afi + sl->format;
1137 activate_grab_clients();
1138 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1141 static void status_pre_select(struct sched *s, struct task *t)
1143 struct status_task *st = container_of(t, struct status_task, task);
1144 int ret, cafn = stat_task->current_audio_format_num;
1146 if (must_start_decoder())
1148 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1152 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1154 sched_request_barrier(&afi[cafn].restart_barrier, s);
1160 /* restart the client task if necessary */
1161 static void status_post_select(__a_unused struct sched *s, struct task *t)
1163 struct status_task *st = container_of(t, struct status_task, task);
1165 if (audiod_status == AUDIOD_OFF) {
1168 if (st->ct->task.error >= 0) {
1169 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1172 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1175 st->clock_diff_count = conf.clock_diff_count_arg;
1182 if (st->ct->task.error < 0) {
1183 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1188 if (st->ct->status != CL_RECEIVING)
1190 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1193 sz = btr_next_buffer(st->btrn, &buf);
1194 ret = for_each_stat_item(buf, sz, update_item);
1196 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1200 st->last_status_read = *now;
1202 struct timeval diff;
1203 tv_diff(now, &st->last_status_read, &diff);
1204 if (diff.tv_sec > 61)
1205 kill_btrn(st->ct->btrn, &st->ct->task,
1208 btr_consume(st->btrn, sz - ret);
1211 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1213 if (st->clock_diff_count) { /* get status only one time */
1214 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1216 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1217 st->clock_diff_count--;
1218 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1219 set_stat_task_restart_barrier(2);
1222 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1224 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1225 set_stat_task_restart_barrier(5);
1227 free(stat_item_values[SI_BASENAME]);
1228 stat_item_values[SI_BASENAME] = para_strdup(
1229 "no connection to para_server");
1230 stat_client_write_item(SI_BASENAME);
1231 st->last_status_read = *now;
1233 start_stop_decoders();
1236 static void init_status_task(struct status_task *st)
1238 memset(st, 0, sizeof(struct status_task));
1239 st->task.pre_select = status_pre_select;
1240 st->task.post_select = status_post_select;
1241 st->sa_time_diff_sign = 1;
1242 st->clock_diff_count = conf.clock_diff_count_arg;
1243 st->current_audio_format_num = -1;
1244 sprintf(st->task.status, "stat");
1245 st->btrn = btr_new_node(&(struct btr_node_description)
1246 EMBRACE(.name = "stat"));
1249 static void set_initial_status(void)
1251 audiod_status = AUDIOD_ON;
1252 if (!conf.mode_given)
1254 if (!strcmp(conf.mode_arg, "sb")) {
1255 audiod_status = AUDIOD_STANDBY;
1258 if (!strcmp(conf.mode_arg, "off")) {
1259 audiod_status = AUDIOD_OFF;
1262 if (strcmp(conf.mode_arg, "on"))
1263 PARA_WARNING_LOG("invalid mode\n");
1266 __noreturn static void print_help_and_die(void)
1268 int d = conf.detailed_help_given;
1269 const char **p = d? audiod_args_info_detailed_help
1270 : audiod_args_info_help;
1272 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1273 AUDIOD_CMDLINE_PARSER_VERSION);
1274 printf_or_die("%s\n\n", audiod_args_info_usage);
1276 printf_or_die("%s\n", *p);
1277 print_receiver_helps(d);
1278 print_filter_helps(d);
1279 print_writer_helps(d);
1283 static void init_colors_or_die(void)
1289 daemon_set_default_log_colors();
1290 daemon_set_flag(DF_COLOR_LOG);
1291 for (i = 0; i < conf.log_color_given; i++) {
1292 ret = daemon_set_log_color(conf.log_color_arg[i]);
1299 * the main function of para_audiod
1301 * \param argc usual argument count
1302 * \param argv usual argument vector
1304 * \return EXIT_SUCCESS or EXIT_FAILURE
1306 * \sa para_audiod(1)
1308 int main(int argc, char *argv[])
1311 static struct sched s;
1312 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1313 struct audiod_cmdline_parser_params params = {
1316 .check_required = 0,
1317 .check_ambiguity = 0,
1322 if (audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms))
1324 HANDLE_VERSION_FLAG("audiod", conf);
1325 /* init receivers/filters/writers early to make help work */
1329 if (conf.help_given || conf.detailed_help_given)
1330 print_help_and_die();
1331 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1332 parse_config_or_die();
1333 init_colors_or_die();
1334 init_random_seed_or_die();
1335 daemon_set_flag(DF_LOG_TIME);
1336 daemon_set_flag(DF_LOG_HOSTNAME);
1337 daemon_set_flag(DF_LOG_LL);
1338 if (conf.log_timing_given)
1339 daemon_set_flag(DF_LOG_TIMING);
1340 if (conf.logfile_given) {
1341 daemon_set_logfile(conf.logfile_arg);
1342 daemon_open_log_or_die();
1344 ret = parse_stream_args();
1346 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1349 log_welcome("para_audiod");
1350 server_uptime(UPTIME_SET);
1351 set_initial_status();
1354 setup_signal_handling();
1355 signal_setup_default(sig_task);
1357 init_status_task(stat_task);
1358 init_command_task(cmd_task);
1360 if (conf.daemon_given)
1363 register_task(&sig_task->task);
1364 register_task(&cmd_task->task);
1365 register_task(&stat_task->task);
1366 s.default_timeout.tv_sec = 2;
1367 s.default_timeout.tv_usec = 999 * 1000;
1370 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1371 return EXIT_FAILURE;