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 */
16 #include "audiod.cmdline.h"
21 #include "buffer_tree.h"
23 #include "grab_client.h"
24 #include "client.cmdline.h"
32 #include "write_common.h"
36 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
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;
182 static int get_matching_audio_format_nums(const char *re)
187 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
191 FOR_EACH_AUDIO_FORMAT(i)
192 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
199 * Compute the play time based on information of the given slot.
201 * \param slot_num The slot number (negative means: no slot).
203 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
204 * from the status items received from para_server and the start time of the
205 * (first) writer of the given slot.
207 * It has to to take into account that probably the stream was not started at
208 * the beginning of the file, that the clock between the server and the client
209 * host may differ and that playback of the stream was delayed, e.g. because
210 * the prebuffer filter is used in the filter configuration of the given slot.
212 * If no writer is active in the given slot, or \a slot_num is negative
213 * (indicating that para_audiod runs in standby mode), an approximation based
214 * only on the status items is computed and the returned string is prefixed
217 * \return A string that must be freed by the caller.
219 char *get_time_string(int slot_num)
221 int ret, seconds = 0, length;
222 struct timeval *tmp, sum, sss, /* server stream start */
223 rstime, /* receiver start time */
224 wstime, /* writer start time */
225 wtime, /* now - writer start */
226 rskip; /* receiver start - sss */
227 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
230 if (audiod_status == AUDIOD_OFF)
232 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
233 if (stat_task->length_seconds) /* paused */
235 goto empty; /* stopped */
237 if (audiod_status == AUDIOD_ON && !s)
240 * Valid status items and playing, set length and tmp to the stream
241 * start. We use the slot info and fall back to the info from current
242 * status items if no slot info is available.
244 length = stat_task->length_seconds;
245 tmp = &stat_task->server_stream_start;
246 if (s && s->wns) { /* writer active in this slot */
247 btr_get_node_start(s->wns[0].btrn, &wstime);
248 if (wstime.tv_sec != 0) { /* writer wrote something */
249 if (s->server_stream_start.tv_sec == 0) {
250 /* copy status info to slot */
251 s->server_stream_start = stat_task->server_stream_start;
252 s->offset_seconds = stat_task->offset_seconds;
253 s->seconds_total = stat_task->length_seconds;
255 length = s->seconds_total;
256 tmp = &s->server_stream_start;
259 if (stat_task->sa_time_diff_sign > 0)
260 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
262 tv_add(tmp, &stat_task->sa_time_diff, &sss);
265 tv_diff(now, &sss, &diff);
266 seconds = diff.tv_sec + stat_task->offset_seconds;
269 tv_diff(now, &wstime, &wtime);
270 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
271 seconds = s->offset_seconds;
272 btr_get_node_start(s->receiver_node->btrn, &rstime);
273 ret = tv_diff(&rstime, &sss, &rskip);
274 if (ret > 0) { /* audiod was started in the middle of the stream */
275 tv_add(&wtime, &rskip, &sum);
276 seconds += sum.tv_sec;
278 seconds += wtime.tv_sec;
280 seconds = PARA_MIN(seconds, length);
281 seconds = PARA_MAX(seconds, 0);
283 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
287 (length - seconds) / 60,
288 (length - seconds) % 60,
289 length? (seconds * 100 + length / 2) / length : 0,
293 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
296 return para_strdup(NULL);
299 static int want_colors(void)
301 if (conf.color_arg == color_arg_no)
303 if (conf.color_arg == color_arg_yes)
305 if (conf.logfile_given)
307 return isatty(STDERR_FILENO);
310 static void parse_config_or_die(void)
314 struct audiod_cmdline_parser_params params = {
318 .check_ambiguity = 0,
322 if (conf.config_file_given)
323 config_file = para_strdup(conf.config_file_arg);
325 char *home = para_homedir();
326 config_file = make_message("%s/.paraslash/audiod.conf", home);
329 ret = file_exists(config_file);
330 if (conf.config_file_given && !ret) {
331 PARA_EMERG_LOG("can not read config file %s\n", config_file);
335 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
337 daemon_set_loglevel(conf.loglevel_arg);
344 static void setup_signal_handling(void)
346 sig_task->fd = para_signal_init();
347 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
348 para_install_sighandler(SIGINT);
349 para_install_sighandler(SIGTERM);
350 para_install_sighandler(SIGHUP);
351 para_sigaction(SIGPIPE, SIG_IGN);
354 static void clear_slot(int slot_num)
356 struct slot_info *s = &slot[slot_num];
358 PARA_INFO_LOG("clearing slot %d\n", slot_num);
359 memset(s, 0, sizeof(struct slot_info));
363 static void close_receiver(int slot_num)
365 struct slot_info *s = &slot[slot_num];
366 struct audio_format_info *a;
368 if (s->format < 0 || !s->receiver_node)
371 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
372 audio_formats[s->format], slot_num);
373 a->receiver->close(s->receiver_node);
374 btr_free_node(s->receiver_node->btrn);
375 free(s->receiver_node);
376 s->receiver_node = NULL;
377 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
378 &a->restart_barrier);
381 static void writer_cleanup(struct writer_node *wn)
387 w = writers + wn->writer_num;
388 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
390 btr_free_node(wn->btrn);
393 static void close_writers(struct slot_info *s)
395 struct audio_format_info *a;
402 if (a->num_writers == 0)
403 writer_cleanup(s->wns);
405 for (i = 0; i < a->num_writers; i++)
406 writer_cleanup(s->wns + i);
412 static void close_filters(struct slot_info *s)
415 struct audio_format_info *a = afi + s->format;
416 if (a->num_filters == 0)
418 for (i = 0; i < a->num_filters; i++) {
419 struct filter_node *fn = s->fns + i;
424 f = filters + fn->filter_num;
427 btr_free_node(fn->btrn);
434 * Whenever a task commits suicide by returning from post_select with t->error
435 * < 0, it also removes its btr node. We do exactly that to kill a running
436 * task. Note that the scheduler checks t->error also _before_ each pre/post
437 * select call, so the victim will never be scheduled again.
439 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
444 btr_remove_node(btrn);
447 static void kill_all_decoders(int error)
452 struct slot_info *s = slot + i;
455 if (!s->receiver_node)
457 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
462 static int get_empty_slot(void)
473 if (s->wns || s->receiver_node || s->fns)
478 return -E_NO_MORE_SLOTS;
481 static void open_filters(struct slot_info *s)
483 struct audio_format_info *a = afi + s->format;
484 struct filter_node *fn;
485 int nf = a->num_filters;
486 struct btr_node *parent;
491 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
492 assert(s->fns == NULL);
493 s->fns = para_calloc(nf * sizeof(struct filter_node));
494 parent = s->receiver_node->btrn;
495 for (i = 0; i < nf; i++) {
496 struct filter *f = filters + a->filter_nums[i];
498 fn->filter_num = a->filter_nums[i];
499 fn->conf = a->filter_conf[i];
500 fn->task.pre_select = f->pre_select;
501 fn->task.post_select = f->post_select;
503 fn->btrn = btr_new_node(&(struct btr_node_description)
504 EMBRACE(.name = f->name, .parent = parent,
505 .handler = f->execute, .context = fn));
508 register_task(&fn->task);
510 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
511 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
512 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
516 static void open_writers(struct slot_info *s)
519 struct audio_format_info *a = afi + s->format;
520 struct writer_node *wn;
521 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
523 assert(s->wns == NULL);
524 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
525 * sizeof(struct writer_node));
526 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
527 for (i = 0; i < a->num_writers; i++) {
529 wn->conf = a->writer_conf[i];
530 wn->writer_num = a->writer_nums[i];
531 register_writer_node(wn, parent);
535 /* returns slot num on success */
536 static int open_receiver(int format)
538 struct audio_format_info *a = &afi[format];
541 struct receiver *r = a->receiver;
542 struct receiver_node *rn;
544 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
545 ret = get_empty_slot();
549 rn = para_calloc(sizeof(*rn));
551 rn->conf = a->receiver_conf;
552 rn->btrn = btr_new_node(&(struct btr_node_description)
553 EMBRACE(.name = r->name, .context = rn));
556 btr_free_node(rn->btrn);
562 s->receiver_node = rn;
563 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
564 audio_formats[format], r->name, slot_num);
565 rn->task.pre_select = r->pre_select;
566 rn->task.post_select = r->post_select;
567 sprintf(rn->task.status, "%s receiver node", r->name);
568 register_task(&rn->task);
572 static bool receiver_running(void)
575 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
578 struct slot_info *s = &slot[i];
579 long unsigned ss2 = s->server_stream_start.tv_sec;
581 if (!s->receiver_node)
583 if (s->receiver_node->task.error >= 0)
592 * Return the root node of the current buffer tree.
594 * This is only used for stream grabbing.
596 * \return \p NULL if no slot is currently active. If more than one buffer tree
597 * exists, the node corresponding to the most recently started receiver is
600 struct btr_node *audiod_get_btr_root(void)
602 int i, newest_slot = -1;
603 struct timeval newest_rstime = {0, 0};
606 struct slot_info *s = &slot[i];
607 struct timeval rstime;
608 if (!s->receiver_node)
610 if (s->receiver_node->task.error < 0)
612 btr_get_node_start(s->receiver_node->btrn, &rstime);
613 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
615 newest_rstime = rstime;
618 if (newest_slot == -1)
620 return slot[newest_slot].receiver_node->btrn;
623 /* whether a new instance of a decoder should be started. */
624 static bool must_start_decoder(void)
626 int cafn = stat_task->current_audio_format_num;
627 unsigned vs = stat_task->vss_status;
629 if (audiod_status != AUDIOD_ON)
635 if (vs & VSS_STATUS_FLAG_NEXT)
637 if (!(vs & VSS_STATUS_FLAG_PLAYING))
639 if (receiver_running())
641 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
646 static unsigned compute_time_diff(const struct timeval *status_time)
648 struct timeval tmp, diff;
649 static unsigned count;
650 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
651 const struct timeval max_deviation = {0, 500 * 1000};
652 const int time_smooth = 5;
656 sign = tv_diff(status_time, now, &diff);
657 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
658 // sign, sa_time_diff_sign);
660 sa_time_diff_sign = sign;
661 stat_task->sa_time_diff = diff;
666 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
667 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
668 PARA_WARNING_LOG("time diff jump: %lims\n",
672 sa_time_diff_sign = tv_convex_combination(
673 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
674 count > 10? sign : sign * time_smooth, &diff,
676 stat_task->sa_time_diff = tmp;
677 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
680 sa_time_diff_sign < 0? "-" : "+",
681 tv2ms(&stat_task->sa_time_diff)
684 stat_task->sa_time_diff_sign = sa_time_diff_sign;
688 static int update_item(int itemnum, char *buf)
690 long unsigned sec, usec;
692 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
694 free(stat_item_values[itemnum]);
695 stat_item_values[itemnum] = para_strdup(buf);
696 stat_client_write_item(itemnum);
698 case SI_STATUS_FLAGS:
699 stat_task->vss_status = 0;
700 if (strchr(buf, 'N'))
701 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
702 if (strchr(buf, 'P'))
703 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
706 stat_task->offset_seconds = atoi(buf);
708 case SI_SECONDS_TOTAL:
709 stat_task->length_seconds = atoi(buf);
711 case SI_STREAM_START:
712 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
713 stat_task->server_stream_start.tv_sec = sec;
714 stat_task->server_stream_start.tv_usec = usec;
717 case SI_CURRENT_TIME:
718 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
719 struct timeval tv = {sec, usec};
720 compute_time_diff(&tv);
724 stat_task->current_audio_format_num
725 = get_audio_format_num(buf);
730 static int parse_stream_command(const char *txt, char **cmd)
733 char *re, *p = strchr(txt, ':');
736 return -E_MISSING_COLON;
739 re = malloc(len + 1);
740 strncpy(re, txt, len);
742 ret = get_matching_audio_format_nums(re);
747 static int add_filter(int format, char *cmdline)
749 struct audio_format_info *a = &afi[format];
750 int filter_num, nf = a->num_filters;
753 filter_num = check_filter_arg(cmdline, &cfg);
756 a->filter_conf = para_realloc(a->filter_conf,
757 (nf + 1) * sizeof(void *));
758 a->filter_nums = para_realloc(a->filter_nums,
759 (nf + 1) * sizeof(unsigned));
760 a->filter_nums[nf] = filter_num;
761 a->filter_conf[nf] = cfg;
763 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
764 filters[filter_num].name);
768 static int parse_writer_args(void)
772 struct audio_format_info *a;
774 for (i = 0; i < conf.writer_given; i++) {
776 int j, nw, writer_num, af_mask;
778 ret = parse_stream_command(conf.writer_arg[i], &cmd);
782 FOR_EACH_AUDIO_FORMAT(j) {
784 if ((af_mask & (1 << j)) == 0) /* no match */
786 wconf = check_writer_arg_or_die(cmd, &writer_num);
788 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
789 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
790 a->writer_nums[nw] = writer_num;
791 a->writer_conf[nw] = wconf;
792 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
793 nw, writer_names[writer_num]);
797 /* Use default writer for audio formats which are not yet set up. */
798 FOR_EACH_AUDIO_FORMAT(i) {
799 struct writer *w = writers + DEFAULT_WRITER;
801 if (a->num_writers > 0)
802 continue; /* already set up */
803 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
804 writer_names[DEFAULT_WRITER]);
805 a->writer_nums = para_malloc(sizeof(int));
806 a->writer_nums[0] = DEFAULT_WRITER;
807 a->writer_conf = para_malloc(sizeof(void *));
808 a->writer_conf[0] = w->parse_config_or_die("");
814 static int parse_receiver_args(void)
816 int i, ret, receiver_num;
818 struct audio_format_info *a;
820 for (i = conf.receiver_given - 1; i >= 0; i--) {
824 ret = parse_stream_command(conf.receiver_arg[i], &arg);
828 FOR_EACH_AUDIO_FORMAT(j) {
830 if ((af_mask & (1 << j)) == 0) /* no match */
833 * If multiple receivers are given for this audio format, the
834 * last one wins and we have to free the previous receiver
835 * config here. Since we are iterating backwards, the winning
836 * receiver arg is in fact the first one given.
838 if (a->receiver_conf)
839 a->receiver->free_config(a->receiver_conf);
840 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
841 ret = -E_RECV_SYNTAX;
842 if (!a->receiver_conf)
844 a->receiver = receivers + receiver_num;
848 * Use the first available receiver with no arguments for those audio
849 * formats for which no receiver was specified.
851 cmd = para_strdup(receivers[0].name);
852 FOR_EACH_AUDIO_FORMAT(i) {
854 if (a->receiver_conf)
856 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
857 if (!a->receiver_conf)
858 return -E_RECV_SYNTAX;
859 a->receiver = &receivers[receiver_num];
861 FOR_EACH_AUDIO_FORMAT(i) {
863 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
864 audio_formats[i], a->receiver->name);
872 static int init_default_filters(void)
876 FOR_EACH_AUDIO_FORMAT(i) {
877 struct audio_format_info *a = &afi[i];
882 continue; /* no default -- nothing to to */
884 * udp and dccp streams are fec-encoded, so add fecdec as the
887 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
888 strcmp(afi[i].receiver->name, "dccp") == 0) {
889 tmp = para_strdup("fecdec");
895 /* add "dec" to audio format name */
896 tmp = make_message("%sdec", audio_formats[i]);
897 for (j = 0; filters[j].name; j++)
898 if (!strcmp(tmp, filters[j].name))
901 ret = -E_UNSUPPORTED_FILTER;
902 if (!filters[j].name)
904 tmp = para_strdup(filters[j].name);
905 ret = add_filter(i, tmp);
909 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
916 static int parse_filter_args(void)
918 int i, j, ret, af_mask;
920 if (!conf.no_default_filters_given)
921 return init_default_filters();
922 for (i = 0; i < conf.filter_given; i++) {
924 ret = parse_stream_command(conf.filter_arg[i], &arg);
928 FOR_EACH_AUDIO_FORMAT(j) {
929 if ((af_mask & (1 << j)) == 0) /* no match */
931 ret = add_filter(j, arg);
936 ret = init_default_filters(); /* use default values for the rest */
941 static int parse_stream_args(void)
945 ret = parse_receiver_args();
948 ret = parse_filter_args();
951 ret = parse_writer_args();
957 /* does not unlink socket on errors */
958 static int audiod_get_socket(void)
960 struct sockaddr_un unix_addr;
963 if (conf.socket_given)
964 socket_name = para_strdup(conf.socket_arg);
966 char *hn = para_hostname();
967 socket_name = make_message("/var/paraslash/audiod_socket.%s",
971 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
972 if (conf.force_given)
974 ret = create_local_socket(socket_name, &unix_addr,
975 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
979 if (listen(fd , 5) < 0) {
980 ret = -ERRNO_TO_PARA_ERROR(errno);
983 ret = mark_fd_nonblocking(fd);
988 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
992 static void signal_pre_select(struct sched *s, struct task *t)
994 struct signal_task *st = container_of(t, struct signal_task, task);
995 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
998 static void signal_post_select(struct sched *s, __a_unused struct task *t)
1002 signum = para_next_signal(&s->rfds);
1007 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1008 clean_exit(EXIT_FAILURE, "caught deadly signal");
1012 static void signal_setup_default(struct signal_task *st)
1014 st->task.pre_select = signal_pre_select;
1015 st->task.post_select = signal_post_select;
1016 sprintf(st->task.status, "signal task");
1019 static void command_pre_select(struct sched *s, struct task *t)
1021 struct command_task *ct = container_of(t, struct command_task, task);
1022 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1025 static void command_post_select(struct sched *s, struct task *t)
1028 struct command_task *ct = container_of(t, struct command_task, task);
1029 static struct timeval last_status_dump;
1030 struct timeval tmp, delay = {0, 500 * 1000};
1032 tv_add(&last_status_dump, &delay, &tmp);
1033 if (tv_diff(&tmp, now, NULL) < 0) {
1034 audiod_status_dump();
1035 last_status_dump = *now;
1038 ret = handle_connect(ct->fd, &s->rfds);
1040 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1041 audiod_status_dump();
1044 static void init_command_task(struct command_task *ct)
1046 ct->task.pre_select = command_pre_select;
1047 ct->task.post_select = command_post_select;
1049 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1050 sprintf(ct->task.status, "command task");
1053 static void close_stat_pipe(void)
1057 client_close(stat_task->ct);
1058 stat_task->ct = NULL;
1059 clear_and_dump_items();
1060 stat_task->length_seconds = 0;
1061 stat_task->offset_seconds = 0;
1062 stat_task->vss_status = 0;
1063 stat_task->current_audio_format_num = -1;
1064 audiod_status_dump();
1068 * close the connection to para_server and exit
1070 * \param status the exit status which is passed to exit(3)
1071 * \param msg the log message
1073 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1074 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1079 void __noreturn clean_exit(int status, const char *msg)
1081 PARA_EMERG_LOG("%s\n", msg);
1083 unlink(socket_name);
1088 /* avoid busy loop if server is down */
1089 static void set_stat_task_restart_barrier(unsigned seconds)
1091 struct timeval delay = {seconds, 0};
1092 tv_add(now, &delay, &stat_task->restart_barrier);
1095 static void try_to_close_slot(int slot_num)
1097 struct slot_info *s = &slot[slot_num];
1098 struct audio_format_info *a = afi + s->format;
1103 if (s->receiver_node && s->receiver_node->task.error >= 0)
1105 for (i = 0; i < a->num_filters; i++)
1106 if (s->fns && s->fns[i].task.error >= 0)
1108 if (a->num_writers > 0) {
1109 for (i = 0; i < a->num_writers; i++)
1110 if (s->wns && s->wns[i].task.error >= 0)
1113 if (s->wns && s->wns[0].task.error >= 0)
1116 PARA_INFO_LOG("closing slot %d\n", slot_num);
1119 close_receiver(slot_num);
1120 clear_slot(slot_num);
1124 * Check if any receivers/filters/writers need to be started and do so if
1127 static void start_stop_decoders(void)
1130 struct slot_info *sl;
1131 struct audio_format_info *a;
1134 try_to_close_slot(i);
1135 if (audiod_status != AUDIOD_ON ||
1136 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1137 return kill_all_decoders(-E_NOT_PLAYING);
1138 if (!must_start_decoder())
1140 ret = open_receiver(stat_task->current_audio_format_num);
1142 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1146 a = afi + sl->format;
1150 activate_grab_clients();
1151 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1154 static void status_pre_select(struct sched *s, struct task *t)
1156 struct status_task *st = container_of(t, struct status_task, task);
1157 int ret, cafn = stat_task->current_audio_format_num;
1159 if (must_start_decoder())
1161 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1164 if (st->ct && audiod_status == AUDIOD_OFF)
1166 if (!st->ct && audiod_status != AUDIOD_OFF)
1167 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1169 sched_request_barrier(&afi[cafn].restart_barrier, s);
1171 * If para_server is playing we'd like to have a smooth time display
1172 * even if we are running in standby mode. So we request a timeout that
1173 * expires at the next full second.
1175 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1176 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1182 /* restart the client task if necessary */
1183 static void status_post_select(__a_unused struct sched *s, struct task *t)
1185 struct status_task *st = container_of(t, struct status_task, task);
1187 if (audiod_status == AUDIOD_OFF) {
1190 if (st->ct->task.error >= 0) {
1191 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1194 if (st->ct->task.error >= 0)
1197 st->clock_diff_count = conf.clock_diff_count_arg;
1204 if (st->ct->task.error < 0) {
1205 if (st->ct->task.error >= 0)
1210 if (st->ct->status != CL_RECEIVING)
1212 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1214 struct timeval diff;
1215 tv_diff(now, &st->last_status_read, &diff);
1216 if (diff.tv_sec > 61)
1217 kill_btrn(st->ct->btrn, &st->ct->task,
1221 btr_merge(st->btrn, st->min_iqs);
1222 sz = btr_next_buffer(st->btrn, &buf);
1223 ret = for_each_stat_item(buf, sz, update_item);
1225 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1229 btr_consume(st->btrn, sz - ret);
1230 st->last_status_read = *now;
1232 } else /* current status item crosses buffers */
1233 st->min_iqs = sz + 1;
1236 btr_drain(st->btrn);
1237 st->current_audio_format_num = -1;
1238 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1240 if (st->clock_diff_count) { /* get status only one time */
1241 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1243 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1244 st->clock_diff_count--;
1245 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1246 set_stat_task_restart_barrier(2);
1249 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1251 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1252 set_stat_task_restart_barrier(5);
1254 free(stat_item_values[SI_BASENAME]);
1255 stat_item_values[SI_BASENAME] = para_strdup(
1256 "no connection to para_server");
1257 stat_client_write_item(SI_BASENAME);
1258 st->last_status_read = *now;
1260 start_stop_decoders();
1263 static void init_status_task(struct status_task *st)
1265 memset(st, 0, sizeof(struct status_task));
1266 st->task.pre_select = status_pre_select;
1267 st->task.post_select = status_post_select;
1268 st->sa_time_diff_sign = 1;
1269 st->clock_diff_count = conf.clock_diff_count_arg;
1270 st->current_audio_format_num = -1;
1271 sprintf(st->task.status, "stat");
1272 st->btrn = btr_new_node(&(struct btr_node_description)
1273 EMBRACE(.name = "stat"));
1276 static void set_initial_status(void)
1278 audiod_status = AUDIOD_ON;
1279 if (!conf.mode_given)
1281 if (!strcmp(conf.mode_arg, "sb")) {
1282 audiod_status = AUDIOD_STANDBY;
1285 if (!strcmp(conf.mode_arg, "off")) {
1286 audiod_status = AUDIOD_OFF;
1289 if (strcmp(conf.mode_arg, "on"))
1290 PARA_WARNING_LOG("invalid mode\n");
1293 __noreturn static void print_help_and_die(void)
1295 int d = conf.detailed_help_given;
1296 const char **p = d? audiod_args_info_detailed_help
1297 : audiod_args_info_help;
1299 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1300 AUDIOD_CMDLINE_PARSER_VERSION);
1301 printf_or_die("%s\n\n", audiod_args_info_usage);
1303 printf_or_die("%s\n", *p);
1304 print_receiver_helps(d);
1305 print_filter_helps(d);
1306 print_writer_helps(d);
1310 static void init_colors_or_die(void)
1316 daemon_set_default_log_colors();
1317 daemon_set_flag(DF_COLOR_LOG);
1318 for (i = 0; i < conf.log_color_given; i++)
1319 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1323 * the main function of para_audiod
1325 * \param argc usual argument count
1326 * \param argv usual argument vector
1328 * \return EXIT_SUCCESS or EXIT_FAILURE
1330 * \sa para_audiod(1)
1332 int main(int argc, char *argv[])
1335 static struct sched s;
1336 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1337 struct audiod_cmdline_parser_params params = {
1340 .check_required = 0,
1341 .check_ambiguity = 0,
1346 if (audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms))
1348 HANDLE_VERSION_FLAG("audiod", conf);
1349 /* init receivers/filters/writers early to make help work */
1353 if (conf.help_given || conf.detailed_help_given)
1354 print_help_and_die();
1355 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1356 parse_config_or_die();
1357 init_colors_or_die();
1358 init_random_seed_or_die();
1359 daemon_set_flag(DF_LOG_TIME);
1360 daemon_set_flag(DF_LOG_HOSTNAME);
1361 daemon_set_flag(DF_LOG_LL);
1362 if (conf.log_timing_given)
1363 daemon_set_flag(DF_LOG_TIMING);
1364 if (conf.logfile_given) {
1365 daemon_set_logfile(conf.logfile_arg);
1366 daemon_open_log_or_die();
1368 ret = parse_stream_args();
1370 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1373 log_welcome("para_audiod");
1374 set_server_start_time(NULL);
1375 set_initial_status();
1378 setup_signal_handling();
1379 signal_setup_default(sig_task);
1381 init_status_task(stat_task);
1382 init_command_task(cmd_task);
1384 if (conf.daemon_given)
1385 daemonize(false /* parent exits immediately */);
1387 register_task(&sig_task->task);
1388 register_task(&cmd_task->task);
1389 register_task(&stat_task->task);
1390 s.default_timeout.tv_sec = 2;
1391 s.default_timeout.tv_usec = 999 * 1000;
1394 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1395 return EXIT_FAILURE;