2 * Copyright (C) 2005-2011 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;
96 /** The offset value announced by para_server. */
98 /** The length of the current audio file as announced by para_server. */
100 /** The start of the current stream from the view of para_server. */
101 struct timeval server_stream_start;
102 /** The average time deviation between para_server and para_audiod. */
103 struct timeval sa_time_diff;
104 /** Whether client time is ahead of server time. */
105 int sa_time_diff_sign;
106 /** The 'P' and the 'N' flags as announced by para_server. */
107 enum vss_status_flags vss_status;
108 /** Number of times the clock difference is to be checked. */
109 unsigned clock_diff_count;
110 /** When to start the next check for clock difference. */
111 struct timeval clock_diff_barrier;
112 /** Number of the audio format as announced by para_server. */
113 int current_audio_format_num;
114 /* The status task btrn is the child of the client task. */
115 struct btr_node *btrn;
118 /** The array of status items sent by para_server. */
119 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
122 * the current mode of operation of which can be changed by the on/off/cycle
123 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
125 int audiod_status = AUDIOD_ON;
128 * the gengetopt args_info struct that holds information on all command line
131 struct audiod_args_info conf;
133 static char *socket_name;
134 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
136 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
138 static struct status_task status_task_struct;
141 * the task that calls the status command of para_server
143 * \sa struct status_task
145 static struct status_task *stat_task = &status_task_struct;
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.
165 * \param name The name of the audio format.
167 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
168 * \a name is not a supported audio format.
170 static int get_audio_format_num(const char *name)
174 while (para_isspace(*name))
176 FOR_EACH_AUDIO_FORMAT(i)
177 if (!strcmp(name, audio_formats[i]))
179 return -E_UNSUPPORTED_AUDIO_FORMAT;
183 * Compute the play time based on information of the given slot.
185 * \param slot_num The slot number (negative means: no slot).
187 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
188 * from the status items received from para_server and the start time of the
189 * (first) writer of the given slot.
191 * It has to to take into account that probably the stream was not started at
192 * the beginning of the file, that the clock between the server and the client
193 * host may differ and that playback of the stream was delayed, e.g. because
194 * the prebuffer filter is used in the filter configuration of the given slot.
196 * If no writer is active in the given slot, or \a slot_num is negative
197 * (indicating that para_audiod runs in standby mode), an approximation based
198 * only on the status items is computed and the returned string is prefixed
201 * \return A string that must be freed by the caller.
203 char *get_time_string(int slot_num)
205 int ret, seconds = 0, length;
206 struct timeval *tmp, sum, sss, /* server stream start */
207 rstime, /* receiver start time */
208 wstime, /* writer start time */
209 wtime, /* now - writer start */
210 rskip; /* receiver start - sss */
211 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
214 if (audiod_status == AUDIOD_OFF)
216 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
217 if (stat_task->length_seconds) /* paused */
219 goto empty; /* stopped */
221 if (audiod_status == AUDIOD_ON && !s)
224 * Valid status items and playing, set length and tmp to the stream
225 * start. We use the slot info and fall back to the info from current
226 * status items if no slot info is available.
228 length = stat_task->length_seconds;
229 tmp = &stat_task->server_stream_start;
230 if (s && s->wns) { /* writer active in this slot */
231 btr_get_node_start(s->wns[0].btrn, &wstime);
232 if (wstime.tv_sec != 0) { /* writer wrote something */
233 if (s->server_stream_start.tv_sec == 0) {
234 /* copy status info to slot */
235 s->server_stream_start = stat_task->server_stream_start;
236 s->offset_seconds = stat_task->offset_seconds;
237 s->seconds_total = stat_task->length_seconds;
239 length = s->seconds_total;
240 tmp = &s->server_stream_start;
243 if (stat_task->sa_time_diff_sign > 0)
244 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
246 tv_add(tmp, &stat_task->sa_time_diff, &sss);
249 tv_diff(now, &sss, &diff);
250 seconds = diff.tv_sec + stat_task->offset_seconds;
253 tv_diff(now, &wstime, &wtime);
254 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
255 seconds = s->offset_seconds;
256 btr_get_node_start(s->receiver_node->btrn, &rstime);
257 ret = tv_diff(&rstime, &sss, &rskip);
258 if (ret > 0) { /* audiod was started in the middle of the stream */
259 tv_add(&wtime, &rskip, &sum);
260 seconds += sum.tv_sec;
262 seconds += wtime.tv_sec;
264 seconds = PARA_MIN(seconds, length);
265 seconds = PARA_MAX(seconds, 0);
267 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
271 (length - seconds) / 60,
272 (length - seconds) % 60,
273 length? (seconds * 100 + length / 2) / length : 0,
277 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
280 return para_strdup(NULL);
283 static int want_colors(void)
285 if (conf.color_arg == color_arg_no)
287 if (conf.color_arg == color_arg_yes)
289 if (conf.logfile_given)
291 return isatty(STDERR_FILENO);
294 static void parse_config_or_die(void)
298 struct audiod_cmdline_parser_params params = {
302 .check_ambiguity = 0,
306 if (conf.config_file_given)
307 config_file = para_strdup(conf.config_file_arg);
309 char *home = para_homedir();
310 config_file = make_message("%s/.paraslash/audiod.conf", home);
313 ret = file_exists(config_file);
314 if (conf.config_file_given && !ret) {
315 PARA_EMERG_LOG("can not read config file %s\n", config_file);
319 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
321 daemon_set_loglevel(conf.loglevel_arg);
328 static void setup_signal_handling(void)
330 sig_task->fd = para_signal_init();
331 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
332 para_install_sighandler(SIGINT);
333 para_install_sighandler(SIGTERM);
334 para_install_sighandler(SIGHUP);
335 para_sigaction(SIGPIPE, SIG_IGN);
338 static void clear_slot(int slot_num)
340 struct slot_info *s = &slot[slot_num];
342 PARA_INFO_LOG("clearing slot %d\n", slot_num);
343 memset(s, 0, sizeof(struct slot_info));
347 static void close_receiver(int slot_num)
349 struct slot_info *s = &slot[slot_num];
350 struct audio_format_info *a;
352 if (s->format < 0 || !s->receiver_node)
355 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
356 audio_formats[s->format], slot_num);
357 a->receiver->close(s->receiver_node);
358 btr_free_node(s->receiver_node->btrn);
359 free(s->receiver_node);
360 s->receiver_node = NULL;
361 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
362 &a->restart_barrier);
365 static void writer_cleanup(struct writer_node *wn)
371 w = writers + wn->writer_num;
372 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
374 btr_free_node(wn->btrn);
377 static void close_writers(struct slot_info *s)
379 struct audio_format_info *a;
386 if (a->num_writers == 0)
387 writer_cleanup(s->wns);
389 for (i = 0; i < a->num_writers; i++)
390 writer_cleanup(s->wns + i);
396 static void close_filters(struct slot_info *s)
399 struct audio_format_info *a = afi + s->format;
400 if (a->num_filters == 0)
402 for (i = 0; i < a->num_filters; i++) {
403 struct filter_node *fn = s->fns + i;
408 f = filters + fn->filter_num;
411 btr_free_node(fn->btrn);
418 * Whenever a task commits suicide by returning from post_select with t->error
419 * < 0, it also removes its btr node. We do exactly that to kill a running
420 * task. Note that the scheduler checks t->error also _before_ each pre/post
421 * select call, so the victim will never be scheduled again.
423 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
428 btr_remove_node(btrn);
431 static void kill_all_decoders(int error)
436 struct slot_info *s = &slot[i];
437 struct audio_format_info *a;
442 for (j = 0; j < a->num_writers; j++)
443 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
445 for (j = 0; j < a->num_writers; j++)
446 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
447 if (s->receiver_node)
448 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
453 static int get_empty_slot(void)
464 if (s->wns || s->receiver_node || s->fns)
469 return -E_NO_MORE_SLOTS;
472 static void open_filters(struct slot_info *s)
474 struct audio_format_info *a = afi + s->format;
475 struct filter_node *fn;
476 int nf = a->num_filters;
477 struct btr_node *parent;
482 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
483 assert(s->fns == NULL);
484 s->fns = para_calloc(nf * sizeof(struct filter_node));
485 parent = s->receiver_node->btrn;
486 for (i = 0; i < nf; i++) {
487 struct filter *f = filters + a->filter_nums[i];
489 fn->filter_num = a->filter_nums[i];
490 fn->conf = a->filter_conf[i];
491 fn->task.pre_select = f->pre_select;
492 fn->task.post_select = f->post_select;
494 fn->btrn = btr_new_node(&(struct btr_node_description)
495 EMBRACE(.name = f->name, .parent = parent,
496 .handler = f->execute, .context = fn));
499 register_task(&fn->task);
501 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
502 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
503 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
507 static void open_writers(struct slot_info *s)
510 struct audio_format_info *a = afi + s->format;
511 struct writer_node *wn;
512 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
514 assert(s->wns == NULL);
515 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
516 * sizeof(struct writer_node));
517 if (a->num_writers == 0)
518 setup_writer_node(NULL, parent, s->wns);
520 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
521 for (i = 0; i < a->num_writers; i++) {
523 wn->conf = a->writer_conf[i];
524 wn->writer_num = a->writer_nums[i];
525 register_writer_node(wn, parent);
530 /* returns slot num on success */
531 static int open_receiver(int format)
533 struct audio_format_info *a = &afi[format];
536 struct receiver *r = a->receiver;
537 struct receiver_node *rn;
539 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
540 ret = get_empty_slot();
544 rn = para_calloc(sizeof(*rn));
546 rn->conf = a->receiver_conf;
547 rn->btrn = btr_new_node(&(struct btr_node_description)
548 EMBRACE(.name = r->name, .context = rn));
551 btr_free_node(rn->btrn);
557 s->receiver_node = rn;
558 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
559 audio_formats[format], r->name, slot_num);
560 rn->task.pre_select = r->pre_select;
561 rn->task.post_select = r->post_select;
562 sprintf(rn->task.status, "%s receiver node", r->name);
563 register_task(&rn->task);
567 static bool receiver_running(void)
570 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
573 struct slot_info *s = &slot[i];
574 long unsigned ss2 = s->server_stream_start.tv_sec;
576 if (!s->receiver_node)
578 if (s->receiver_node->task.error >= 0)
587 * Return the root node of the current buffer tree.
589 * This is only used for stream grabbing.
591 * \return \p NULL if no slot is currently active. If more than one buffer tree
592 * exists, the node corresponding to the most recently started receiver is
595 struct btr_node *audiod_get_btr_root(void)
597 int i, newest_slot = -1;
598 struct timeval newest_rstime = {0, 0};
601 struct slot_info *s = &slot[i];
602 struct timeval rstime;
603 if (!s->receiver_node)
605 if (s->receiver_node->task.error < 0)
607 btr_get_node_start(s->receiver_node->btrn, &rstime);
608 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
610 newest_rstime = rstime;
613 if (newest_slot == -1)
615 return slot[newest_slot].receiver_node->btrn;
618 /* whether a new instance of a decoder should be started. */
619 static bool must_start_decoder(void)
621 int cafn = stat_task->current_audio_format_num;
622 unsigned vs = stat_task->vss_status;
624 if (audiod_status != AUDIOD_ON)
630 if (vs & VSS_STATUS_FLAG_NEXT)
632 if (!(vs & VSS_STATUS_FLAG_PLAYING))
634 if (receiver_running())
636 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
641 static unsigned compute_time_diff(const struct timeval *status_time)
643 struct timeval tmp, diff;
644 static unsigned count;
645 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
646 const struct timeval max_deviation = {0, 500 * 1000};
647 const int time_smooth = 5;
651 sign = tv_diff(status_time, now, &diff);
652 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
653 // sign, sa_time_diff_sign);
655 sa_time_diff_sign = sign;
656 stat_task->sa_time_diff = diff;
661 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
662 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
663 PARA_WARNING_LOG("time diff jump: %lims\n",
667 sa_time_diff_sign = tv_convex_combination(
668 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
669 count > 10? sign : sign * time_smooth, &diff,
671 stat_task->sa_time_diff = tmp;
672 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
675 sa_time_diff_sign < 0? "-" : "+",
676 tv2ms(&stat_task->sa_time_diff)
679 stat_task->sa_time_diff_sign = sa_time_diff_sign;
683 static int update_item(int itemnum, char *buf)
685 long unsigned sec, usec;
687 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
689 free(stat_item_values[itemnum]);
690 stat_item_values[itemnum] = para_strdup(buf);
691 stat_client_write_item(itemnum);
693 case SI_STATUS_FLAGS:
694 stat_task->vss_status = 0;
695 if (strchr(buf, 'N'))
696 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
697 if (strchr(buf, 'P'))
698 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
701 stat_task->offset_seconds = atoi(buf);
703 case SI_SECONDS_TOTAL:
704 stat_task->length_seconds = atoi(buf);
706 case SI_STREAM_START:
707 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
708 stat_task->server_stream_start.tv_sec = sec;
709 stat_task->server_stream_start.tv_usec = usec;
712 case SI_CURRENT_TIME:
713 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
714 struct timeval tv = {sec, usec};
715 compute_time_diff(&tv);
719 stat_task->current_audio_format_num
720 = get_audio_format_num(buf);
725 static int parse_stream_command(const char *txt, char **cmd)
727 char *p = strchr(txt, ':');
731 return -E_MISSING_COLON;
733 FOR_EACH_AUDIO_FORMAT(i) {
734 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
739 return -E_UNSUPPORTED_AUDIO_FORMAT;
742 static int add_filter(int format, char *cmdline)
744 struct audio_format_info *a = &afi[format];
745 int filter_num, nf = a->num_filters;
747 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
750 a->filter_nums[nf] = filter_num;
752 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
753 filters[filter_num].name);
757 static int parse_writer_args(void)
761 struct audio_format_info *a;
763 nw = PARA_MAX(1U, conf.writer_given);
764 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
765 FOR_EACH_AUDIO_FORMAT(i) {
767 a->writer_conf = para_malloc(nw * sizeof(void *));
768 a->writer_nums = para_malloc(nw * sizeof(int));
771 for (i = 0; i < conf.writer_given; i++) {
774 ret = parse_stream_command(conf.writer_arg[i], &cmd);
779 wconf = check_writer_arg(cmd, &writer_num);
784 a->writer_nums[nw] = writer_num;
785 a->writer_conf[nw] = wconf;
786 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
787 nw, writer_names[writer_num]);
795 static int parse_receiver_args(void)
797 int i, ret, receiver_num;
799 struct audio_format_info *a;
801 for (i = conf.receiver_given - 1; i >= 0; i--) {
802 char *arg = conf.receiver_arg[i];
803 char *recv_arg = strchr(arg, ':');
804 ret = -E_MISSING_COLON;
809 ret = get_audio_format_num(arg);
813 * If multiple receivers are given for this audio format, the
814 * last one wins and we have to free the previous receiver
815 * config here. Since we are iterating backwards, the winning
816 * receiver arg is in fact the first one given.
818 if (afi[ret].receiver_conf)
819 afi[ret].receiver->free_config(afi[ret].receiver_conf);
820 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
821 if (!afi[ret].receiver_conf) {
822 ret = -E_RECV_SYNTAX;
825 afi[ret].receiver = &receivers[receiver_num];
828 * Use the first available receiver with no arguments for those audio
829 * formats for which no receiver was specified.
831 cmd = para_strdup(receivers[0].name);
832 FOR_EACH_AUDIO_FORMAT(i) {
834 if (a->receiver_conf)
836 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
837 if (!a->receiver_conf)
838 return -E_RECV_SYNTAX;
839 a->receiver = &receivers[receiver_num];
847 static int init_default_filters(void)
851 FOR_EACH_AUDIO_FORMAT(i) {
852 struct audio_format_info *a = &afi[i];
857 continue; /* no default -- nothing to to */
859 * If udp is used to receive this audiod format, add fecdec as
862 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
863 strcmp(afi[i].receiver->name, "dccp") == 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, __a_unused struct task *t)
984 signum = para_next_signal(&s->rfds);
989 PARA_EMERG_LOG("terminating on signal %d\n", signum);
990 clean_exit(EXIT_FAILURE, "caught deadly signal");
994 static void signal_setup_default(struct signal_task *st)
996 st->task.pre_select = signal_pre_select;
997 st->task.post_select = signal_post_select;
998 sprintf(st->task.status, "signal task");
1001 static void command_pre_select(struct sched *s, struct task *t)
1003 struct command_task *ct = container_of(t, struct command_task, task);
1004 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1007 static void command_post_select(struct sched *s, struct task *t)
1010 struct command_task *ct = container_of(t, struct command_task, task);
1011 static struct timeval last_status_dump;
1012 struct timeval tmp, delay = {0, 500 * 1000};
1014 tv_add(&last_status_dump, &delay, &tmp);
1015 if (tv_diff(&tmp, now, NULL) < 0) {
1016 audiod_status_dump();
1017 last_status_dump = *now;
1020 ret = handle_connect(ct->fd, &s->rfds);
1022 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1023 audiod_status_dump();
1026 static void init_command_task(struct command_task *ct)
1028 ct->task.pre_select = command_pre_select;
1029 ct->task.post_select = command_post_select;
1031 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1032 sprintf(ct->task.status, "command task");
1035 static void close_stat_pipe(void)
1039 btr_free_node(stat_task->ct->btrn);
1040 client_close(stat_task->ct);
1041 stat_task->ct = NULL;
1042 clear_and_dump_items();
1043 stat_task->length_seconds = 0;
1044 stat_task->offset_seconds = 0;
1045 stat_task->vss_status = 0;
1046 stat_task->current_audio_format_num = -1;
1047 audiod_status_dump();
1051 * close the connection to para_server and exit
1053 * \param status the exit status which is passed to exit(3)
1054 * \param msg the log message
1056 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1057 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1062 void __noreturn clean_exit(int status, const char *msg)
1064 PARA_EMERG_LOG("%s\n", msg);
1066 unlink(socket_name);
1071 /* avoid busy loop if server is down */
1072 static void set_stat_task_restart_barrier(unsigned seconds)
1074 struct timeval delay = {seconds, 0};
1075 tv_add(now, &delay, &stat_task->restart_barrier);
1078 static void try_to_close_slot(int slot_num)
1080 struct slot_info *s = &slot[slot_num];
1081 struct audio_format_info *a = afi + s->format;
1086 if (s->receiver_node && s->receiver_node->task.error >= 0)
1088 for (i = 0; i < a->num_filters; i++)
1089 if (s->fns && s->fns[i].task.error >= 0)
1091 if (a->num_writers > 0) {
1092 for (i = 0; i < a->num_writers; i++)
1093 if (s->wns && s->wns[i].task.error >= 0)
1096 if (s->wns && s->wns[0].task.error >= 0)
1099 PARA_INFO_LOG("closing slot %d\n", slot_num);
1102 close_receiver(slot_num);
1103 clear_slot(slot_num);
1107 * Check if any receivers/filters/writers need to be started and do so if
1110 static void start_stop_decoders(void)
1113 struct slot_info *sl;
1114 struct audio_format_info *a;
1117 try_to_close_slot(i);
1118 if (audiod_status != AUDIOD_ON ||
1119 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1120 return kill_all_decoders(-E_NOT_PLAYING);
1121 if (!must_start_decoder())
1123 ret = open_receiver(stat_task->current_audio_format_num);
1125 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1129 a = afi + sl->format;
1133 activate_grab_clients();
1134 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1137 static void status_pre_select(struct sched *s, struct task *t)
1139 struct status_task *st = container_of(t, struct status_task, task);
1140 int ret, cafn = stat_task->current_audio_format_num;
1142 if (must_start_decoder())
1144 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1147 if (st->ct && audiod_status == AUDIOD_OFF)
1149 if (!st->ct && audiod_status != AUDIOD_OFF)
1150 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1152 sched_request_barrier(&afi[cafn].restart_barrier, s);
1154 * If para_server is playing we'd like to have a smooth time display
1155 * even if we are running in standby mode. So we request a timeout that
1156 * expires at the next full second.
1158 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1159 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1165 /* restart the client task if necessary */
1166 static void status_post_select(__a_unused struct sched *s, struct task *t)
1168 struct status_task *st = container_of(t, struct status_task, task);
1170 if (audiod_status == AUDIOD_OFF) {
1173 if (st->ct->task.error >= 0) {
1174 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1177 if (st->ct->task.error >= 0)
1180 st->clock_diff_count = conf.clock_diff_count_arg;
1187 if (st->ct->task.error < 0) {
1188 if (st->ct->task.error >= 0)
1193 if (st->ct->status != CL_RECEIVING)
1195 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1197 struct timeval diff;
1198 tv_diff(now, &st->last_status_read, &diff);
1199 if (diff.tv_sec > 61)
1200 kill_btrn(st->ct->btrn, &st->ct->task,
1204 btr_merge(st->btrn, st->min_iqs);
1205 sz = btr_next_buffer(st->btrn, &buf);
1206 ret = for_each_stat_item(buf, sz, update_item);
1208 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1212 btr_consume(st->btrn, sz - ret);
1213 st->last_status_read = *now;
1215 } else /* current status item crosses buffers */
1216 st->min_iqs = sz + 1;
1219 btr_drain(st->btrn);
1220 st->current_audio_format_num = -1;
1221 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1223 if (st->clock_diff_count) { /* get status only one time */
1224 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1226 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1227 st->clock_diff_count--;
1228 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1229 set_stat_task_restart_barrier(2);
1232 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1234 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1235 set_stat_task_restart_barrier(5);
1237 free(stat_item_values[SI_BASENAME]);
1238 stat_item_values[SI_BASENAME] = para_strdup(
1239 "no connection to para_server");
1240 stat_client_write_item(SI_BASENAME);
1241 st->last_status_read = *now;
1243 start_stop_decoders();
1246 static void init_status_task(struct status_task *st)
1248 memset(st, 0, sizeof(struct status_task));
1249 st->task.pre_select = status_pre_select;
1250 st->task.post_select = status_post_select;
1251 st->sa_time_diff_sign = 1;
1252 st->clock_diff_count = conf.clock_diff_count_arg;
1253 st->current_audio_format_num = -1;
1254 sprintf(st->task.status, "stat");
1255 st->btrn = btr_new_node(&(struct btr_node_description)
1256 EMBRACE(.name = "stat"));
1259 static void set_initial_status(void)
1261 audiod_status = AUDIOD_ON;
1262 if (!conf.mode_given)
1264 if (!strcmp(conf.mode_arg, "sb")) {
1265 audiod_status = AUDIOD_STANDBY;
1268 if (!strcmp(conf.mode_arg, "off")) {
1269 audiod_status = AUDIOD_OFF;
1272 if (strcmp(conf.mode_arg, "on"))
1273 PARA_WARNING_LOG("invalid mode\n");
1276 __noreturn static void print_help_and_die(void)
1278 int d = conf.detailed_help_given;
1279 const char **p = d? audiod_args_info_detailed_help
1280 : audiod_args_info_help;
1282 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1283 AUDIOD_CMDLINE_PARSER_VERSION);
1284 printf_or_die("%s\n\n", audiod_args_info_usage);
1286 printf_or_die("%s\n", *p);
1287 print_receiver_helps(d);
1288 print_filter_helps(d);
1289 print_writer_helps(d);
1293 static void init_colors_or_die(void)
1299 daemon_set_default_log_colors();
1300 daemon_set_flag(DF_COLOR_LOG);
1301 for (i = 0; i < conf.log_color_given; i++)
1302 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1306 * the main function of para_audiod
1308 * \param argc usual argument count
1309 * \param argv usual argument vector
1311 * \return EXIT_SUCCESS or EXIT_FAILURE
1313 * \sa para_audiod(1)
1315 int main(int argc, char *argv[])
1318 static struct sched s;
1319 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1320 struct audiod_cmdline_parser_params params = {
1323 .check_required = 0,
1324 .check_ambiguity = 0,
1329 if (audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms))
1331 HANDLE_VERSION_FLAG("audiod", conf);
1332 /* init receivers/filters/writers early to make help work */
1336 if (conf.help_given || conf.detailed_help_given)
1337 print_help_and_die();
1338 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1339 parse_config_or_die();
1340 init_colors_or_die();
1341 init_random_seed_or_die();
1342 daemon_set_flag(DF_LOG_TIME);
1343 daemon_set_flag(DF_LOG_HOSTNAME);
1344 daemon_set_flag(DF_LOG_LL);
1345 if (conf.log_timing_given)
1346 daemon_set_flag(DF_LOG_TIMING);
1347 if (conf.logfile_given) {
1348 daemon_set_logfile(conf.logfile_arg);
1349 daemon_open_log_or_die();
1351 ret = parse_stream_args();
1353 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1356 log_welcome("para_audiod");
1357 server_uptime(UPTIME_SET);
1358 set_initial_status();
1361 setup_signal_handling();
1362 signal_setup_default(sig_task);
1364 init_status_task(stat_task);
1365 init_command_task(cmd_task);
1367 if (conf.daemon_given)
1370 register_task(&sig_task->task);
1371 register_task(&cmd_task->task);
1372 register_task(&stat_task->task);
1373 s.default_timeout.tv_sec = 2;
1374 s.default_timeout.tv_usec = 999 * 1000;
1377 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1378 return EXIT_FAILURE;