2 * Copyright (C) 2005-2010 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 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 chain 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;
363 static void writer_cleanup(struct writer_node *wn)
369 w = writers + wn->writer_num;
370 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
372 btr_free_node(wn->btrn);
375 static void close_writers(struct slot_info *s)
377 struct audio_format_info *a;
384 if (a->num_writers == 0)
385 writer_cleanup(s->wns);
387 for (i = 0; i < a->num_writers; i++)
388 writer_cleanup(s->wns + i);
394 static void close_filters(struct slot_info *s)
397 struct audio_format_info *a = afi + s->format;
398 if (a->num_filters == 0)
400 for (i = 0; i < a->num_filters; i++) {
401 struct filter_node *fn = s->fns + i;
406 f = filters + fn->filter_num;
409 btr_free_node(fn->btrn);
416 * Whenever a task commits suicide by returning from post_select with t->error
417 * < 0, it also removes its btr node. We do exactly that to kill a running
418 * task. Note that the scheduler checks t->error also _before_ each pre/post
419 * select call, so the victim will never be scheduled again.
421 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
426 btr_remove_node(btrn);
429 static void kill_all_decoders(int error)
434 struct slot_info *s = &slot[i];
435 struct audio_format_info *a;
440 for (j = 0; j < a->num_writers; j++)
441 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
443 for (j = 0; j < a->num_writers; j++)
444 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
445 if (s->receiver_node)
446 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
451 static int get_empty_slot(void)
462 if (s->wns || s->receiver_node || s->fns)
467 return -E_NO_MORE_SLOTS;
471 * get the number of filters
473 * \param audio_format_num the number identifying the audio format
475 * \return the number of filters for the given audio format
479 int num_filters(int audio_format_num)
481 return afi[audio_format_num].num_filters;
484 static void open_filters(struct slot_info *s)
486 struct audio_format_info *a = afi + s->format;
487 struct filter_node *fn;
488 int nf = a->num_filters;
489 struct btr_node *parent;
494 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
495 assert(s->fns == NULL);
496 s->fns = para_calloc(nf * sizeof(struct filter_node));
497 parent = s->receiver_node->btrn;
498 for (i = 0; i < nf; i++) {
499 struct filter *f = filters + a->filter_nums[i];
501 fn->filter_num = a->filter_nums[i];
502 fn->conf = a->filter_conf[i];
503 fn->task.pre_select = f->pre_select;
504 fn->task.post_select = f->post_select;
506 fn->btrn = btr_new_node(&(struct btr_node_description)
507 EMBRACE(.name = f->name, .parent = parent,
508 .handler = f->execute, .context = fn));
511 register_task(&fn->task);
513 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
514 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
515 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
519 static void open_writers(struct slot_info *s)
522 struct audio_format_info *a = afi + s->format;
523 struct writer_node *wn;
524 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
526 assert(s->wns == NULL);
527 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
528 * sizeof(struct writer_node));
529 if (a->num_writers == 0)
530 setup_writer_node(NULL, parent, s->wns);
532 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
533 for (i = 0; i < a->num_writers; i++) {
535 wn->conf = a->writer_conf[i];
536 wn->writer_num = a->writer_nums[i];
537 register_writer_node(wn, parent);
542 /* returns slot num on success */
543 static int open_receiver(int format)
545 struct audio_format_info *a = &afi[format];
548 struct receiver *r = a->receiver;
549 struct receiver_node *rn;
551 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
552 ret = get_empty_slot();
556 rn = para_calloc(sizeof(*rn));
558 rn->conf = a->receiver_conf;
559 rn->btrn = btr_new_node(&(struct btr_node_description)
560 EMBRACE(.name = r->name, .context = rn));
563 btr_free_node(rn->btrn);
569 s->receiver_node = rn;
570 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
571 audio_formats[format], r->name, slot_num);
572 rn->task.pre_select = r->pre_select;
573 rn->task.post_select = r->post_select;
574 sprintf(rn->task.status, "%s receiver node", r->name);
575 register_task(&rn->task);
579 static bool receiver_running(void)
582 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
585 struct slot_info *s = &slot[i];
586 long unsigned ss2 = s->server_stream_start.tv_sec;
588 if (!s->receiver_node)
590 if (s->receiver_node->task.error >= 0)
599 * Return the root node of the current buffer tree.
601 * This is only used for stream grabbing.
603 * \return \p NULL if no slot is currently active. If more than one buffer tree
604 * exists, the node corresponding to the most recently started receiver is
607 struct btr_node *audiod_get_btr_root(void)
609 int i, newest_slot = -1;
610 struct timeval newest_rstime = {0, 0};
613 struct slot_info *s = &slot[i];
614 struct timeval rstime;
615 if (!s->receiver_node)
617 if (s->receiver_node->task.error < 0)
619 btr_get_node_start(s->receiver_node->btrn, &rstime);
620 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
622 newest_rstime = rstime;
625 if (newest_slot == -1)
627 return slot[newest_slot].receiver_node->btrn;
630 /* whether a new instance of a decoder should be started. */
631 static bool must_start_decoder(void)
633 int cafn = stat_task->current_audio_format_num;
634 unsigned vs = stat_task->vss_status;
636 if (audiod_status != AUDIOD_ON)
642 if (vs & VSS_STATUS_FLAG_NEXT)
644 if (!(vs & VSS_STATUS_FLAG_PLAYING))
646 if (receiver_running())
648 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
653 static unsigned compute_time_diff(const struct timeval *status_time)
655 struct timeval tmp, diff;
656 static unsigned count;
657 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
658 const struct timeval max_deviation = {0, 500 * 1000};
659 const int time_smooth = 5;
663 sign = tv_diff(status_time, now, &diff);
664 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
665 // sign, sa_time_diff_sign);
667 sa_time_diff_sign = sign;
668 stat_task->sa_time_diff = diff;
673 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
674 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
675 PARA_WARNING_LOG("time diff jump: %lims\n",
679 sa_time_diff_sign = tv_convex_combination(
680 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
681 count > 10? sign : sign * time_smooth, &diff,
683 stat_task->sa_time_diff = tmp;
684 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
687 sa_time_diff_sign < 0? "-" : "+",
688 tv2ms(&stat_task->sa_time_diff)
691 stat_task->sa_time_diff_sign = sa_time_diff_sign;
695 static int update_item(int itemnum, char *buf)
697 long unsigned sec, usec;
699 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
701 free(stat_item_values[itemnum]);
702 stat_item_values[itemnum] = para_strdup(buf);
703 stat_client_write_item(itemnum);
705 case SI_STATUS_FLAGS:
706 stat_task->vss_status = 0;
707 if (strchr(buf, 'N'))
708 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
709 if (strchr(buf, 'P'))
710 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
713 stat_task->offset_seconds = atoi(buf);
715 case SI_SECONDS_TOTAL:
716 stat_task->length_seconds = atoi(buf);
718 case SI_STREAM_START:
719 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
720 stat_task->server_stream_start.tv_sec = sec;
721 stat_task->server_stream_start.tv_usec = usec;
724 case SI_CURRENT_TIME:
725 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
726 struct timeval tv = {sec, usec};
727 compute_time_diff(&tv);
731 stat_task->current_audio_format_num
732 = get_audio_format_num(buf);
737 static int parse_stream_command(const char *txt, char **cmd)
739 char *p = strchr(txt, ':');
743 return -E_MISSING_COLON;
745 FOR_EACH_AUDIO_FORMAT(i) {
746 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
751 return -E_UNSUPPORTED_AUDIO_FORMAT;
754 static int add_filter(int format, char *cmdline)
756 struct audio_format_info *a = &afi[format];
757 int filter_num, nf = a->num_filters;
759 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
762 a->filter_nums[nf] = filter_num;
764 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
765 filters[filter_num].name);
769 static int parse_writer_args(void)
773 struct audio_format_info *a;
775 nw = PARA_MAX(1U, conf.writer_given);
776 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
777 FOR_EACH_AUDIO_FORMAT(i) {
779 a->writer_conf = para_malloc(nw * sizeof(void *));
780 a->writer_nums = para_malloc(nw * sizeof(int));
783 for (i = 0; i < conf.writer_given; i++) {
786 ret = parse_stream_command(conf.writer_arg[i], &cmd);
791 wconf = check_writer_arg(cmd, &writer_num);
796 a->writer_nums[nw] = writer_num;
797 a->writer_conf[nw] = wconf;
798 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
799 nw, writer_names[writer_num]);
807 static int parse_receiver_args(void)
809 int i, ret, receiver_num;
811 struct audio_format_info *a;
813 for (i = conf.receiver_given - 1; i >= 0; i--) {
814 char *arg = conf.receiver_arg[i];
815 char *recv_arg = strchr(arg, ':');
816 ret = -E_MISSING_COLON;
821 ret = get_audio_format_num(arg);
824 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
825 if (!afi[ret].receiver_conf) {
826 ret = -E_RECV_SYNTAX;
829 afi[ret].receiver = &receivers[receiver_num];
831 /* use the first available receiver with no arguments
832 * for those audio formats for which no receiver
835 cmd = para_strdup(receivers[0].name);
836 FOR_EACH_AUDIO_FORMAT(i) {
838 if (a->receiver_conf)
840 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
841 if (!a->receiver_conf)
842 return -E_RECV_SYNTAX;
843 a->receiver = &receivers[receiver_num];
851 static int init_default_filters(void)
855 FOR_EACH_AUDIO_FORMAT(i) {
856 struct audio_format_info *a = &afi[i];
861 continue; /* no default -- nothing to to */
863 * If udp is used to receive this audiod format, add fecdec as
866 if (strcmp(afi[i].receiver->name, "udp") == 0) {
867 tmp = para_strdup("fecdec");
873 /* add "dec" to audio format name */
874 tmp = make_message("%sdec", audio_formats[i]);
875 for (j = 0; filters[j].name; j++)
876 if (!strcmp(tmp, filters[j].name))
879 ret = -E_UNSUPPORTED_FILTER;
880 if (!filters[j].name)
882 tmp = para_strdup(filters[j].name);
883 ret = add_filter(i, tmp);
887 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
894 static int parse_filter_args(void)
898 nf = PARA_MAX(2U, conf.filter_given);
899 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
900 FOR_EACH_AUDIO_FORMAT(i) {
901 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
902 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
904 if (!conf.no_default_filters_given)
905 return init_default_filters();
906 for (i = 0; i < conf.filter_given; i++) {
907 char *arg = conf.filter_arg[i];
908 char *filter_name = strchr(arg, ':');
909 ret = -E_MISSING_COLON;
914 ret = get_audio_format_num(arg);
917 ret = add_filter(ret, filter_name);
921 ret = init_default_filters(); /* use default values for the rest */
926 static int parse_stream_args(void)
930 ret = parse_receiver_args();
933 ret = parse_filter_args();
936 ret = parse_writer_args();
942 /* does not unlink socket on errors */
943 static int audiod_get_socket(void)
945 struct sockaddr_un unix_addr;
948 if (conf.socket_given)
949 socket_name = para_strdup(conf.socket_arg);
951 char *hn = para_hostname();
952 socket_name = make_message("/var/paraslash/audiod_socket.%s",
956 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
957 if (conf.force_given)
959 ret = create_local_socket(socket_name, &unix_addr,
960 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
964 if (listen(fd , 5) < 0) {
965 ret = -ERRNO_TO_PARA_ERROR(errno);
968 ret = mark_fd_nonblocking(fd);
973 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
977 static void signal_pre_select(struct sched *s, struct task *t)
979 struct signal_task *st = container_of(t, struct signal_task, task);
980 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
983 static void signal_post_select(struct sched *s, __a_unused struct task *t)
987 signum = para_next_signal(&s->rfds);
992 PARA_EMERG_LOG("terminating on signal %d\n", 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 ret = handle_connect(ct->fd, &s->rfds);
1025 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1026 audiod_status_dump();
1029 static void init_command_task(struct command_task *ct)
1031 ct->task.pre_select = command_pre_select;
1032 ct->task.post_select = command_post_select;
1034 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1035 sprintf(ct->task.status, "command task");
1038 static void close_stat_pipe(void)
1042 btr_free_node(stat_task->ct->btrn);
1043 client_close(stat_task->ct);
1044 stat_task->ct = NULL;
1045 clear_and_dump_items();
1046 stat_task->length_seconds = 0;
1047 stat_task->offset_seconds = 0;
1048 stat_task->vss_status = 0;
1049 stat_task->current_audio_format_num = -1;
1050 audiod_status_dump();
1054 * close the connection to para_server and exit
1056 * \param status the exit status which is passed to exit(3)
1057 * \param msg the log message
1059 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1060 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1065 void __noreturn clean_exit(int status, const char *msg)
1067 PARA_EMERG_LOG("%s\n", msg);
1069 unlink(socket_name);
1074 /* avoid busy loop if server is down */
1075 static void set_stat_task_restart_barrier(unsigned seconds)
1077 struct timeval delay = {seconds, 0};
1078 tv_add(now, &delay, &stat_task->restart_barrier);
1081 static void try_to_close_slot(int slot_num)
1083 struct slot_info *s = &slot[slot_num];
1084 struct audio_format_info *a = afi + s->format;
1089 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1091 for (i = 0; i < a->num_filters; i++)
1092 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1094 if (a->num_writers > 0) {
1095 for (i = 0; i < a->num_writers; i++)
1096 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1099 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1102 PARA_INFO_LOG("closing slot %d\n", slot_num);
1105 close_receiver(slot_num);
1106 clear_slot(slot_num);
1110 * Check if any receivers/filters/writers need to be started and do so if
1113 static void start_stop_decoders(void)
1116 struct slot_info *sl;
1117 struct audio_format_info *a;
1120 try_to_close_slot(i);
1121 if (audiod_status != AUDIOD_ON ||
1122 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1123 return kill_all_decoders(-E_NOT_PLAYING);
1124 if (!must_start_decoder())
1126 ret = open_receiver(stat_task->current_audio_format_num);
1128 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1132 a = afi + sl->format;
1136 activate_grab_clients();
1137 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1140 static void status_pre_select(struct sched *s, struct task *t)
1142 struct status_task *st = container_of(t, struct status_task, task);
1143 int ret, cafn = stat_task->current_audio_format_num;
1145 if (must_start_decoder())
1147 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1150 if (st->ct && audiod_status == AUDIOD_OFF)
1152 if (!st->ct && audiod_status != AUDIOD_OFF)
1153 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1155 sched_request_barrier(&afi[cafn].restart_barrier, s);
1157 * If para_server is playing we'd like to have a smooth time display
1158 * even if we are running in standby mode. So we request a timeout that
1159 * expires at the next full second.
1161 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1162 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1168 /* restart the client task if necessary */
1169 static void status_post_select(__a_unused struct sched *s, struct task *t)
1171 struct status_task *st = container_of(t, struct status_task, task);
1173 if (audiod_status == AUDIOD_OFF) {
1176 if (st->ct->task.error >= 0) {
1177 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1180 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1183 st->clock_diff_count = conf.clock_diff_count_arg;
1190 if (st->ct->task.error < 0) {
1191 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1196 if (st->ct->status != CL_RECEIVING)
1198 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1200 struct timeval diff;
1201 tv_diff(now, &st->last_status_read, &diff);
1202 if (diff.tv_sec > 61)
1203 kill_btrn(st->ct->btrn, &st->ct->task,
1207 btr_merge(st->btrn, st->min_iqs);
1208 sz = btr_next_buffer(st->btrn, &buf);
1209 ret = for_each_stat_item(buf, sz, update_item);
1211 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1215 btr_consume(st->btrn, sz - ret);
1216 st->last_status_read = *now;
1218 } else /* current status item crosses buffers */
1219 st->min_iqs = sz + 1;
1222 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1224 if (st->clock_diff_count) { /* get status only one time */
1225 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1227 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1228 st->clock_diff_count--;
1229 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1230 set_stat_task_restart_barrier(2);
1233 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1235 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1236 set_stat_task_restart_barrier(5);
1238 free(stat_item_values[SI_BASENAME]);
1239 stat_item_values[SI_BASENAME] = para_strdup(
1240 "no connection to para_server");
1241 stat_client_write_item(SI_BASENAME);
1242 st->last_status_read = *now;
1244 start_stop_decoders();
1247 static void init_status_task(struct status_task *st)
1249 memset(st, 0, sizeof(struct status_task));
1250 st->task.pre_select = status_pre_select;
1251 st->task.post_select = status_post_select;
1252 st->sa_time_diff_sign = 1;
1253 st->clock_diff_count = conf.clock_diff_count_arg;
1254 st->current_audio_format_num = -1;
1255 sprintf(st->task.status, "stat");
1256 st->btrn = btr_new_node(&(struct btr_node_description)
1257 EMBRACE(.name = "stat"));
1260 static void set_initial_status(void)
1262 audiod_status = AUDIOD_ON;
1263 if (!conf.mode_given)
1265 if (!strcmp(conf.mode_arg, "sb")) {
1266 audiod_status = AUDIOD_STANDBY;
1269 if (!strcmp(conf.mode_arg, "off")) {
1270 audiod_status = AUDIOD_OFF;
1273 if (strcmp(conf.mode_arg, "on"))
1274 PARA_WARNING_LOG("invalid mode\n");
1277 __noreturn static void print_help_and_die(void)
1279 int d = conf.detailed_help_given;
1280 const char **p = d? audiod_args_info_detailed_help
1281 : audiod_args_info_help;
1283 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1284 AUDIOD_CMDLINE_PARSER_VERSION);
1285 printf_or_die("%s\n\n", audiod_args_info_usage);
1287 printf_or_die("%s\n", *p);
1288 print_receiver_helps(d);
1289 print_filter_helps(d);
1290 print_writer_helps(d);
1294 static void init_colors_or_die(void)
1300 daemon_set_default_log_colors();
1301 daemon_set_flag(DF_COLOR_LOG);
1302 for (i = 0; i < conf.log_color_given; i++) {
1303 ret = daemon_set_log_color(conf.log_color_arg[i]);
1310 * the main function of para_audiod
1312 * \param argc usual argument count
1313 * \param argv usual argument vector
1315 * \return EXIT_SUCCESS or EXIT_FAILURE
1317 * \sa para_audiod(1)
1319 int main(int argc, char *argv[])
1322 static struct sched s;
1323 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1324 struct audiod_cmdline_parser_params params = {
1327 .check_required = 0,
1328 .check_ambiguity = 0,
1333 if (audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms))
1335 HANDLE_VERSION_FLAG("audiod", conf);
1336 /* init receivers/filters/writers early to make help work */
1340 if (conf.help_given || conf.detailed_help_given)
1341 print_help_and_die();
1342 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1343 parse_config_or_die();
1344 init_colors_or_die();
1345 init_random_seed_or_die();
1346 daemon_set_flag(DF_LOG_TIME);
1347 daemon_set_flag(DF_LOG_HOSTNAME);
1348 daemon_set_flag(DF_LOG_LL);
1349 if (conf.log_timing_given)
1350 daemon_set_flag(DF_LOG_TIMING);
1351 if (conf.logfile_given) {
1352 daemon_set_logfile(conf.logfile_arg);
1353 daemon_open_log_or_die();
1355 ret = parse_stream_args();
1357 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1360 log_welcome("para_audiod");
1361 server_uptime(UPTIME_SET);
1362 set_initial_status();
1365 setup_signal_handling();
1366 signal_setup_default(sig_task);
1368 init_status_task(stat_task);
1369 init_command_task(cmd_task);
1371 if (conf.daemon_given)
1374 register_task(&sig_task->task);
1375 register_task(&cmd_task->task);
1376 register_task(&stat_task->task);
1377 s.default_timeout.tv_sec = 2;
1378 s.default_timeout.tv_usec = 999 * 1000;
1381 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1382 return EXIT_FAILURE;