2 * Copyright (C) 2005-2012 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. */
15 #include "audiod.cmdline.h"
20 #include "buffer_tree.h"
22 #include "grab_client.h"
23 #include "client.cmdline.h"
31 #include "write_common.h"
35 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
36 /** define the array of error lists needed by para_audiod */
38 /** define the array containing all supported audio formats */
39 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
41 /** Defines how audiod handles one supported audio format. */
42 struct audio_format_info {
43 /** pointer to the receiver for this audio format */
44 struct receiver *receiver;
45 /** the receiver configuration */
47 /** the number of filters that should be activated for this audio format */
48 unsigned int num_filters;
49 /** Array of filter numbers to be activated. */
50 unsigned *filter_nums;
51 /** Pointer to the array of filter configurations. */
53 /** the number of filters that should be activated for this audio format */
54 unsigned int num_writers;
55 /** Array of writer numbers to be activated. */
57 /** pointer to the array of writer configurations */
59 /** do not start receiver/filters/writer before this time */
60 struct timeval restart_barrier;
64 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
65 * be associated with a receiver/filter/writer triple. This array holds all
66 * information on the status of these slots.
68 * \sa struct slot_info
70 struct slot_info slot[MAX_STREAM_SLOTS];
72 /** The vss status flags audiod is interested in. */
73 enum vss_status_flags {
74 /** Whether the 'N' flag is set. */
75 VSS_STATUS_FLAG_NEXT = 1,
76 /** The 'P' flag is set. */
77 VSS_STATUS_FLAG_PLAYING = 2,
81 * The scheduler instance of para_audiod.
83 * This is needed also in audiod_command.c (for the tasks command), so it can
86 struct sched sched = {.max_fileno = 0};
89 * The task for obtaining para_server's status (para_client stat).
91 * \sa struct task, struct sched.
94 /** The associated task structure of audiod. */
96 /** Client data associated with the stat task. */
97 struct client_task *ct;
98 /** Do not restart client command until this time. */
99 struct timeval restart_barrier;
100 /** Last time we received status data from para_server. */
101 struct timeval last_status_read;
103 /** The offset value announced by para_server. */
105 /** The length of the current audio file as announced by para_server. */
107 /** The start of the current stream from the view of para_server. */
108 struct timeval server_stream_start;
109 /** The average time deviation between para_server and para_audiod. */
110 struct timeval sa_time_diff;
111 /** Whether client time is ahead of server time. */
112 int sa_time_diff_sign;
113 /** The 'P' and the 'N' flags as announced by para_server. */
114 enum vss_status_flags vss_status;
115 /** Number of times the clock difference is to be checked. */
116 unsigned clock_diff_count;
117 /** When to start the next check for clock difference. */
118 struct timeval clock_diff_barrier;
119 /** Number of the audio format as announced by para_server. */
120 int current_audio_format_num;
121 /* The status task btrn is the child of the client task. */
122 struct btr_node *btrn;
125 /** The array of status items sent by para_server. */
126 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
129 * the current mode of operation of which can be changed by the on/off/cycle
130 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
132 int audiod_status = AUDIOD_ON;
135 * the gengetopt args_info struct that holds information on all command line
138 struct audiod_args_info conf;
140 static char *socket_name;
141 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
143 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
145 static struct status_task status_task_struct;
148 * the task that calls the status command of para_server
150 * \sa struct status_task
152 static struct status_task *stat_task = &status_task_struct;
155 * the task for handling audiod commands
157 * \sa struct task, struct sched
159 struct command_task {
160 /** the local listening socket */
162 /** the associated task structure */
166 /** iterate over all supported audio formats */
167 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
170 * Get the audio format number.
172 * \param name The name of the audio format.
174 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
175 * \a name is not a supported audio format.
177 static int get_audio_format_num(const char *name)
181 while (para_isspace(*name))
183 FOR_EACH_AUDIO_FORMAT(i)
184 if (!strcmp(name, audio_formats[i]))
186 return -E_UNSUPPORTED_AUDIO_FORMAT;
189 static int get_matching_audio_format_nums(const char *re)
194 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
198 FOR_EACH_AUDIO_FORMAT(i)
199 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
206 * Compute the play time based on information of the given slot.
208 * \param slot_num The slot number (negative means: no slot).
210 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
211 * from the status items received from para_server and the start time of the
212 * (first) writer of the given slot.
214 * It has to to take into account that probably the stream was not started at
215 * the beginning of the file, that the clock between the server and the client
216 * host may differ and that playback of the stream was delayed, e.g. because
217 * the prebuffer filter is used in the filter configuration of the given slot.
219 * If no writer is active in the given slot, or \a slot_num is negative
220 * (indicating that para_audiod runs in standby mode), an approximation based
221 * only on the status items is computed and the returned string is prefixed
224 * \return A string that must be freed by the caller.
226 char *get_time_string(int slot_num)
228 int ret, seconds = 0, length;
229 struct timeval *tmp, sum, sss, /* server stream start */
230 rstime, /* receiver start time */
231 wstime, /* writer start time */
232 wtime, /* now - writer start */
233 rskip; /* receiver start - sss */
234 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
237 if (audiod_status == AUDIOD_OFF)
239 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
240 if (stat_task->length_seconds) /* paused */
242 goto empty; /* stopped */
244 if (audiod_status == AUDIOD_ON && !s)
247 * Valid status items and playing, set length and tmp to the stream
248 * start. We use the slot info and fall back to the info from current
249 * status items if no slot info is available.
251 length = stat_task->length_seconds;
252 tmp = &stat_task->server_stream_start;
253 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
254 btr_get_node_start(s->wns[0].btrn, &wstime);
255 if (wstime.tv_sec != 0) { /* writer wrote something */
256 if (s->server_stream_start.tv_sec == 0) {
257 /* copy status info to slot */
258 s->server_stream_start = stat_task->server_stream_start;
259 s->offset_seconds = stat_task->offset_seconds;
260 s->seconds_total = stat_task->length_seconds;
262 length = s->seconds_total;
263 tmp = &s->server_stream_start;
266 if (stat_task->sa_time_diff_sign > 0)
267 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
269 tv_add(tmp, &stat_task->sa_time_diff, &sss);
270 if (!s || !s->wns || !s->wns[0].btrn) {
272 tv_diff(now, &sss, &diff);
273 seconds = diff.tv_sec + stat_task->offset_seconds;
276 tv_diff(now, &wstime, &wtime);
277 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
278 seconds = s->offset_seconds;
279 if (s->receiver_node->btrn) {
280 btr_get_node_start(s->receiver_node->btrn, &rstime);
281 ret = tv_diff(&rstime, &sss, &rskip);
282 if (ret > 0) { /* audiod was started in the middle of the stream */
283 tv_add(&wtime, &rskip, &sum);
284 seconds += sum.tv_sec;
286 seconds += wtime.tv_sec;
288 seconds += wtime.tv_sec;
290 seconds = PARA_MIN(seconds, length);
291 seconds = PARA_MAX(seconds, 0);
293 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
297 (length - seconds) / 60,
298 (length - seconds) % 60,
299 length? (seconds * 100 + length / 2) / length : 0,
303 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
306 return para_strdup(NULL);
309 static int want_colors(void)
311 if (conf.color_arg == color_arg_no)
313 if (conf.color_arg == color_arg_yes)
315 if (conf.logfile_given)
317 return isatty(STDERR_FILENO);
320 static void parse_config_or_die(void)
324 struct audiod_cmdline_parser_params params = {
328 .check_ambiguity = 0,
332 if (conf.config_file_given)
333 config_file = para_strdup(conf.config_file_arg);
335 char *home = para_homedir();
336 config_file = make_message("%s/.paraslash/audiod.conf", home);
339 ret = file_exists(config_file);
340 if (conf.config_file_given && !ret) {
341 PARA_EMERG_LOG("can not read config file %s\n", config_file);
345 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
347 daemon_set_loglevel(conf.loglevel_arg);
354 static void setup_signal_handling(void)
356 sig_task->fd = para_signal_init();
357 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
358 para_install_sighandler(SIGINT);
359 para_install_sighandler(SIGTERM);
360 para_install_sighandler(SIGHUP);
361 para_sigaction(SIGPIPE, SIG_IGN);
364 static void clear_slot(int slot_num)
366 struct slot_info *s = &slot[slot_num];
368 PARA_INFO_LOG("clearing slot %d\n", slot_num);
369 memset(s, 0, sizeof(struct slot_info));
373 static void close_receiver(int slot_num)
375 struct slot_info *s = &slot[slot_num];
376 struct audio_format_info *a;
378 if (s->format < 0 || !s->receiver_node)
381 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
382 audio_formats[s->format], slot_num);
383 a->receiver->close(s->receiver_node);
384 btr_free_node(s->receiver_node->btrn);
385 free(s->receiver_node);
386 s->receiver_node = NULL;
387 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
388 &a->restart_barrier);
391 static void writer_cleanup(struct writer_node *wn)
397 w = writers + wn->writer_num;
398 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
400 btr_free_node(wn->btrn);
403 static void close_writers(struct slot_info *s)
405 struct audio_format_info *a;
412 if (a->num_writers == 0)
413 writer_cleanup(s->wns);
415 for (i = 0; i < a->num_writers; i++)
416 writer_cleanup(s->wns + i);
422 static void close_filters(struct slot_info *s)
425 struct audio_format_info *a = afi + s->format;
426 if (a->num_filters == 0)
428 for (i = 0; i < a->num_filters; i++) {
429 struct filter_node *fn = s->fns + i;
434 f = filters + fn->filter_num;
437 btr_free_node(fn->btrn);
444 * Whenever a task commits suicide by returning from post_select with t->error
445 * < 0, it also removes its btr node. We do exactly that to kill a running
446 * task. Note that the scheduler checks t->error also _before_ each pre/post
447 * select call, so the victim will never be scheduled again.
449 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
454 btr_remove_node(btrn);
457 static void kill_all_decoders(int error)
462 struct slot_info *s = slot + i;
465 if (!s->receiver_node)
467 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
472 static int get_empty_slot(void)
483 if (s->wns || s->receiver_node || s->fns)
488 return -E_NO_MORE_SLOTS;
491 static void open_filters(struct slot_info *s)
493 struct audio_format_info *a = afi + s->format;
494 struct filter_node *fn;
495 int nf = a->num_filters;
496 struct btr_node *parent;
501 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
502 assert(s->fns == NULL);
503 s->fns = para_calloc(nf * sizeof(struct filter_node));
504 parent = s->receiver_node->btrn;
505 for (i = 0; i < nf; i++) {
506 struct filter *f = filters + a->filter_nums[i];
508 fn->filter_num = a->filter_nums[i];
509 fn->conf = a->filter_conf[i];
510 fn->task.pre_select = f->pre_select;
511 fn->task.post_select = f->post_select;
513 fn->btrn = btr_new_node(&(struct btr_node_description)
514 EMBRACE(.name = f->name, .parent = parent,
515 .handler = f->execute, .context = fn));
518 register_task(&sched, &fn->task);
520 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
521 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
522 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
526 static void open_writers(struct slot_info *s)
529 struct audio_format_info *a = afi + s->format;
530 struct writer_node *wn;
531 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
533 assert(s->wns == NULL);
534 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
535 * sizeof(struct writer_node));
536 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
537 for (i = 0; i < a->num_writers; i++) {
539 wn->conf = a->writer_conf[i];
540 wn->writer_num = a->writer_nums[i];
541 register_writer_node(wn, parent, &sched);
545 /* returns slot num on success */
546 static int open_receiver(int format)
548 struct audio_format_info *a = &afi[format];
551 struct receiver *r = a->receiver;
552 struct receiver_node *rn;
554 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
555 ret = get_empty_slot();
559 rn = para_calloc(sizeof(*rn));
561 rn->conf = a->receiver_conf;
562 rn->btrn = btr_new_node(&(struct btr_node_description)
563 EMBRACE(.name = r->name, .context = rn));
566 btr_free_node(rn->btrn);
572 s->receiver_node = rn;
573 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
574 audio_formats[format], r->name, slot_num);
575 rn->task.pre_select = r->pre_select;
576 rn->task.post_select = r->post_select;
577 sprintf(rn->task.status, "%s receiver node", r->name);
578 register_task(&sched, &rn->task);
582 static bool receiver_running(void)
585 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
588 struct slot_info *s = &slot[i];
589 long unsigned ss2 = s->server_stream_start.tv_sec;
591 if (!s->receiver_node)
593 if (s->receiver_node->task.error >= 0)
602 * Return the root node of the current buffer tree.
604 * This is only used for stream grabbing.
606 * \return \p NULL if no slot is currently active. If more than one buffer tree
607 * exists, the node corresponding to the most recently started receiver is
610 struct btr_node *audiod_get_btr_root(void)
612 int i, newest_slot = -1;
613 struct timeval newest_rstime = {0, 0};
616 struct slot_info *s = &slot[i];
617 struct timeval rstime;
618 if (!s->receiver_node)
620 if (s->receiver_node->task.error < 0)
622 btr_get_node_start(s->receiver_node->btrn, &rstime);
623 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
625 newest_rstime = rstime;
628 if (newest_slot == -1)
630 return slot[newest_slot].receiver_node->btrn;
633 /* whether a new instance of a decoder should be started. */
634 static bool must_start_decoder(void)
636 int cafn = stat_task->current_audio_format_num;
637 unsigned vs = stat_task->vss_status;
639 if (audiod_status != AUDIOD_ON)
645 if (vs & VSS_STATUS_FLAG_NEXT)
647 if (!(vs & VSS_STATUS_FLAG_PLAYING))
649 if (receiver_running())
651 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
656 static unsigned compute_time_diff(const struct timeval *status_time)
658 struct timeval tmp, diff;
659 static unsigned count;
660 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
661 const struct timeval max_deviation = {0, 500 * 1000};
662 const int time_smooth = 5;
666 sign = tv_diff(status_time, now, &diff);
667 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
668 // sign, sa_time_diff_sign);
670 sa_time_diff_sign = sign;
671 stat_task->sa_time_diff = diff;
676 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
677 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
678 PARA_WARNING_LOG("time diff jump: %lims\n",
682 sa_time_diff_sign = tv_convex_combination(
683 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
684 count > 10? sign : sign * time_smooth, &diff,
686 stat_task->sa_time_diff = tmp;
687 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
690 sa_time_diff_sign < 0? "-" : "+",
691 tv2ms(&stat_task->sa_time_diff)
694 stat_task->sa_time_diff_sign = sa_time_diff_sign;
698 static int update_item(int itemnum, char *buf)
700 long unsigned sec, usec;
702 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
704 free(stat_item_values[itemnum]);
705 stat_item_values[itemnum] = para_strdup(buf);
706 stat_client_write_item(itemnum);
708 case SI_STATUS_FLAGS:
709 stat_task->vss_status = 0;
710 if (strchr(buf, 'N'))
711 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
712 if (strchr(buf, 'P'))
713 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
716 stat_task->offset_seconds = atoi(buf);
718 case SI_SECONDS_TOTAL:
719 stat_task->length_seconds = atoi(buf);
721 case SI_STREAM_START:
722 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
723 stat_task->server_stream_start.tv_sec = sec;
724 stat_task->server_stream_start.tv_usec = usec;
727 case SI_CURRENT_TIME:
728 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
729 struct timeval tv = {sec, usec};
730 compute_time_diff(&tv);
734 stat_task->current_audio_format_num
735 = get_audio_format_num(buf);
740 static int parse_stream_command(const char *txt, char **cmd)
743 char *re, *p = strchr(txt, ':');
746 return -E_MISSING_COLON;
749 re = malloc(len + 1);
750 strncpy(re, txt, len);
752 ret = get_matching_audio_format_nums(re);
757 static int add_filter(int format, char *cmdline)
759 struct audio_format_info *a = &afi[format];
760 int filter_num, nf = a->num_filters;
763 filter_num = check_filter_arg(cmdline, &cfg);
766 a->filter_conf = para_realloc(a->filter_conf,
767 (nf + 1) * sizeof(void *));
768 a->filter_nums = para_realloc(a->filter_nums,
769 (nf + 1) * sizeof(unsigned));
770 a->filter_nums[nf] = filter_num;
771 a->filter_conf[nf] = cfg;
773 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
774 filters[filter_num].name);
778 static int parse_writer_args(void)
782 struct audio_format_info *a;
784 for (i = 0; i < conf.writer_given; i++) {
786 int j, nw, writer_num, af_mask;
788 ret = parse_stream_command(conf.writer_arg[i], &cmd);
792 FOR_EACH_AUDIO_FORMAT(j) {
794 if ((af_mask & (1 << j)) == 0) /* no match */
796 wconf = check_writer_arg_or_die(cmd, &writer_num);
798 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
799 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
800 a->writer_nums[nw] = writer_num;
801 a->writer_conf[nw] = wconf;
802 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
803 nw, writer_names[writer_num]);
807 /* Use default writer for audio formats which are not yet set up. */
808 FOR_EACH_AUDIO_FORMAT(i) {
809 struct writer *w = writers + DEFAULT_WRITER;
811 if (a->num_writers > 0)
812 continue; /* already set up */
813 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
814 writer_names[DEFAULT_WRITER]);
815 a->writer_nums = para_malloc(sizeof(int));
816 a->writer_nums[0] = DEFAULT_WRITER;
817 a->writer_conf = para_malloc(sizeof(void *));
818 a->writer_conf[0] = w->parse_config_or_die("");
824 static int parse_receiver_args(void)
826 int i, ret, receiver_num;
828 struct audio_format_info *a;
830 for (i = conf.receiver_given - 1; i >= 0; i--) {
834 ret = parse_stream_command(conf.receiver_arg[i], &arg);
838 FOR_EACH_AUDIO_FORMAT(j) {
840 if ((af_mask & (1 << j)) == 0) /* no match */
843 * If multiple receivers are given for this audio format, the
844 * last one wins and we have to free the previous receiver
845 * config here. Since we are iterating backwards, the winning
846 * receiver arg is in fact the first one given.
848 if (a->receiver_conf)
849 a->receiver->free_config(a->receiver_conf);
850 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
851 ret = -E_RECV_SYNTAX;
852 if (!a->receiver_conf)
854 a->receiver = receivers + receiver_num;
858 * Use the first available receiver with no arguments for those audio
859 * formats for which no receiver was specified.
861 cmd = para_strdup(receivers[0].name);
862 FOR_EACH_AUDIO_FORMAT(i) {
864 if (a->receiver_conf)
866 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
867 if (!a->receiver_conf)
868 return -E_RECV_SYNTAX;
869 a->receiver = &receivers[receiver_num];
871 FOR_EACH_AUDIO_FORMAT(i) {
873 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
874 audio_formats[i], a->receiver->name);
882 static int init_default_filters(void)
886 FOR_EACH_AUDIO_FORMAT(i) {
887 struct audio_format_info *a = &afi[i];
892 continue; /* no default -- nothing to to */
894 * udp and dccp streams are fec-encoded, so add fecdec as the
897 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
898 strcmp(afi[i].receiver->name, "dccp") == 0) {
899 tmp = para_strdup("fecdec");
905 /* add "dec" to audio format name */
906 tmp = make_message("%sdec", audio_formats[i]);
907 for (j = 0; filters[j].name; j++)
908 if (!strcmp(tmp, filters[j].name))
911 ret = -E_UNSUPPORTED_FILTER;
912 if (!filters[j].name)
914 tmp = para_strdup(filters[j].name);
915 ret = add_filter(i, tmp);
919 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
926 static int parse_filter_args(void)
928 int i, j, ret, af_mask;
930 for (i = 0; i < conf.filter_given; i++) {
932 ret = parse_stream_command(conf.filter_arg[i], &arg);
936 FOR_EACH_AUDIO_FORMAT(j) {
937 if ((af_mask & (1 << j)) == 0) /* no match */
939 ret = add_filter(j, arg);
944 ret = init_default_filters(); /* use default values for the rest */
949 static int parse_stream_args(void)
953 ret = parse_receiver_args();
956 ret = parse_filter_args();
959 ret = parse_writer_args();
965 /* does not unlink socket on errors */
966 static int audiod_get_socket(void)
968 struct sockaddr_un unix_addr;
971 if (conf.socket_given)
972 socket_name = para_strdup(conf.socket_arg);
974 char *hn = para_hostname();
975 socket_name = make_message("/var/paraslash/audiod_socket.%s",
979 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
980 if (conf.force_given)
982 ret = create_local_socket(socket_name, &unix_addr,
983 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
987 if (listen(fd , 5) < 0) {
988 ret = -ERRNO_TO_PARA_ERROR(errno);
991 ret = mark_fd_nonblocking(fd);
996 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1000 static void signal_pre_select(struct sched *s, struct task *t)
1002 struct signal_task *st = container_of(t, struct signal_task, task);
1003 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1006 static void signal_post_select(struct sched *s, __a_unused struct task *t)
1010 signum = para_next_signal(&s->rfds);
1015 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1016 clean_exit(EXIT_FAILURE, "caught deadly signal");
1020 static void signal_setup_default(struct signal_task *st)
1022 st->task.pre_select = signal_pre_select;
1023 st->task.post_select = signal_post_select;
1024 sprintf(st->task.status, "signal task");
1027 static void command_pre_select(struct sched *s, struct task *t)
1029 struct command_task *ct = container_of(t, struct command_task, task);
1030 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1033 static void command_post_select(struct sched *s, struct task *t)
1036 struct command_task *ct = container_of(t, struct command_task, task);
1037 static struct timeval last_status_dump;
1038 struct timeval tmp, delay = {0, 500 * 1000};
1040 tv_add(&last_status_dump, &delay, &tmp);
1041 if (tv_diff(&tmp, now, NULL) < 0) {
1042 audiod_status_dump();
1043 last_status_dump = *now;
1046 ret = handle_connect(ct->fd, &s->rfds);
1048 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1049 audiod_status_dump();
1052 static void init_command_task(struct command_task *ct)
1054 ct->task.pre_select = command_pre_select;
1055 ct->task.post_select = command_post_select;
1057 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1058 sprintf(ct->task.status, "command task");
1061 static void close_stat_pipe(void)
1065 client_close(stat_task->ct);
1066 stat_task->ct = NULL;
1067 clear_and_dump_items();
1068 stat_task->length_seconds = 0;
1069 stat_task->offset_seconds = 0;
1070 stat_task->vss_status = 0;
1071 stat_task->current_audio_format_num = -1;
1072 audiod_status_dump();
1076 * close the connection to para_server and exit
1078 * \param status the exit status which is passed to exit(3)
1079 * \param msg the log message
1081 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1082 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1087 void __noreturn clean_exit(int status, const char *msg)
1089 PARA_EMERG_LOG("%s\n", msg);
1091 unlink(socket_name);
1096 /* avoid busy loop if server is down */
1097 static void set_stat_task_restart_barrier(unsigned seconds)
1099 struct timeval delay = {seconds, 0};
1100 tv_add(now, &delay, &stat_task->restart_barrier);
1103 static void try_to_close_slot(int slot_num)
1105 struct slot_info *s = &slot[slot_num];
1106 struct audio_format_info *a = afi + s->format;
1111 if (s->receiver_node && s->receiver_node->task.error >= 0)
1113 for (i = 0; i < a->num_filters; i++)
1114 if (s->fns && s->fns[i].task.error >= 0)
1116 if (a->num_writers > 0) {
1117 for (i = 0; i < a->num_writers; i++)
1118 if (s->wns && s->wns[i].task.error >= 0)
1121 if (s->wns && s->wns[0].task.error >= 0)
1124 PARA_INFO_LOG("closing slot %d\n", slot_num);
1127 close_receiver(slot_num);
1128 clear_slot(slot_num);
1132 * Check if any receivers/filters/writers need to be started and do so if
1135 static void start_stop_decoders(void)
1138 struct slot_info *sl;
1139 struct audio_format_info *a;
1142 try_to_close_slot(i);
1143 if (audiod_status != AUDIOD_ON ||
1144 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1145 return kill_all_decoders(-E_NOT_PLAYING);
1146 if (!must_start_decoder())
1148 ret = open_receiver(stat_task->current_audio_format_num);
1150 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1154 a = afi + sl->format;
1158 activate_grab_clients(&sched);
1159 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1162 static void status_pre_select(struct sched *s, struct task *t)
1164 struct status_task *st = container_of(t, struct status_task, task);
1165 int ret, cafn = stat_task->current_audio_format_num;
1167 if (must_start_decoder())
1169 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1172 if (st->ct && audiod_status == AUDIOD_OFF)
1174 if (!st->ct && audiod_status != AUDIOD_OFF)
1175 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1177 sched_request_barrier(&afi[cafn].restart_barrier, s);
1179 * If para_server is playing we'd like to have a smooth time display
1180 * even if we are running in standby mode. So we request a timeout that
1181 * expires at the next full second.
1183 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1184 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1190 /* restart the client task if necessary */
1191 static void status_post_select(struct sched *s, struct task *t)
1193 struct status_task *st = container_of(t, struct status_task, task);
1195 if (audiod_status == AUDIOD_OFF) {
1198 if (st->ct->task.error >= 0) {
1199 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1202 if (st->ct->task.error >= 0)
1205 st->clock_diff_count = conf.clock_diff_count_arg;
1212 if (st->ct->task.error < 0) {
1213 if (st->ct->task.error >= 0)
1218 if (st->ct->status != CL_RECEIVING)
1220 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1222 struct timeval diff;
1223 tv_diff(now, &st->last_status_read, &diff);
1224 if (diff.tv_sec > 61)
1225 kill_btrn(st->ct->btrn, &st->ct->task,
1229 btr_merge(st->btrn, st->min_iqs);
1230 sz = btr_next_buffer(st->btrn, &buf);
1231 ret = for_each_stat_item(buf, sz, update_item);
1233 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1237 btr_consume(st->btrn, sz - ret);
1238 st->last_status_read = *now;
1240 } else /* current status item crosses buffers */
1241 st->min_iqs = sz + 1;
1244 btr_drain(st->btrn);
1245 st->current_audio_format_num = -1;
1246 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1248 if (st->clock_diff_count) { /* get status only one time */
1249 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1251 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1252 st->clock_diff_count--;
1253 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1254 set_stat_task_restart_barrier(2);
1257 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1259 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1260 set_stat_task_restart_barrier(5);
1262 free(stat_item_values[SI_BASENAME]);
1263 stat_item_values[SI_BASENAME] = para_strdup(
1264 "no connection to para_server");
1265 stat_client_write_item(SI_BASENAME);
1266 st->last_status_read = *now;
1268 start_stop_decoders();
1271 static void init_status_task(struct status_task *st)
1273 memset(st, 0, sizeof(struct status_task));
1274 st->task.pre_select = status_pre_select;
1275 st->task.post_select = status_post_select;
1276 st->sa_time_diff_sign = 1;
1277 st->clock_diff_count = conf.clock_diff_count_arg;
1278 st->current_audio_format_num = -1;
1279 sprintf(st->task.status, "stat");
1280 st->btrn = btr_new_node(&(struct btr_node_description)
1281 EMBRACE(.name = "stat"));
1284 static void set_initial_status(void)
1286 audiod_status = AUDIOD_ON;
1287 if (!conf.mode_given)
1289 if (!strcmp(conf.mode_arg, "sb")) {
1290 audiod_status = AUDIOD_STANDBY;
1293 if (!strcmp(conf.mode_arg, "off")) {
1294 audiod_status = AUDIOD_OFF;
1297 if (strcmp(conf.mode_arg, "on"))
1298 PARA_WARNING_LOG("invalid mode\n");
1301 __noreturn static void print_help_and_die(void)
1303 int d = conf.detailed_help_given;
1304 const char **p = d? audiod_args_info_detailed_help
1305 : audiod_args_info_help;
1307 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1308 AUDIOD_CMDLINE_PARSER_VERSION);
1309 printf_or_die("%s\n\n", audiod_args_info_usage);
1311 printf_or_die("%s\n", *p);
1312 print_receiver_helps(d);
1313 print_filter_helps(d);
1314 print_writer_helps(d);
1318 static void init_colors_or_die(void)
1324 daemon_set_default_log_colors();
1325 daemon_set_flag(DF_COLOR_LOG);
1326 for (i = 0; i < conf.log_color_given; i++)
1327 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1331 * the main function of para_audiod
1333 * \param argc usual argument count
1334 * \param argv usual argument vector
1336 * \return EXIT_SUCCESS or EXIT_FAILURE
1338 * \sa para_audiod(1)
1340 int main(int argc, char *argv[])
1343 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1344 struct audiod_cmdline_parser_params params = {
1347 .check_required = 0,
1348 .check_ambiguity = 0,
1353 if (audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms))
1355 HANDLE_VERSION_FLAG("audiod", conf);
1356 /* init receivers/filters/writers early to make help work */
1360 if (conf.help_given || conf.detailed_help_given)
1361 print_help_and_die();
1362 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1363 parse_config_or_die();
1364 init_colors_or_die();
1365 init_random_seed_or_die();
1366 daemon_set_flag(DF_LOG_TIME);
1367 daemon_set_flag(DF_LOG_HOSTNAME);
1368 daemon_set_flag(DF_LOG_LL);
1369 if (conf.log_timing_given)
1370 daemon_set_flag(DF_LOG_TIMING);
1371 if (conf.logfile_given) {
1372 daemon_set_logfile(conf.logfile_arg);
1373 daemon_open_log_or_die();
1375 ret = parse_stream_args();
1377 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1380 log_welcome("para_audiod");
1381 set_server_start_time(NULL);
1382 set_initial_status();
1385 setup_signal_handling();
1386 signal_setup_default(sig_task);
1388 init_status_task(stat_task);
1389 init_command_task(cmd_task);
1391 if (conf.daemon_given)
1392 daemonize(false /* parent exits immediately */);
1394 register_task(&sched, &sig_task->task);
1395 register_task(&sched, &cmd_task->task);
1396 register_task(&sched, &stat_task->task);
1397 sched.default_timeout.tv_sec = 2;
1398 sched.default_timeout.tv_usec = 999 * 1000;
1399 ret = schedule(&sched);
1401 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1402 return EXIT_FAILURE;