2 * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file audiod.c The paraslash's audio daemon. */
9 #include <netinet/in.h>
10 #include <sys/socket.h>
12 #include <sys/types.h>
13 #include <arpa/inet.h>
21 #include "audiod.cmdline.h"
25 #include "buffer_tree.h"
28 #include "grab_client.h"
29 #include "client.cmdline.h"
37 #include "write_common.h"
41 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
42 /** define the array of error lists needed by para_audiod */
44 /** define the array containing all supported audio formats */
45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
47 DEFINE_RECEIVER_ARRAY;
49 /** Defines how audiod handles one supported audio format. */
50 struct audio_format_info {
51 /** pointer to the receiver for this audio format */
52 struct receiver *receiver;
53 /** the receiver configuration */
55 /** the number of filters that should be activated for this audio format */
56 unsigned int num_filters;
57 /** Array of filter numbers to be activated. */
58 unsigned *filter_nums;
59 /** Pointer to the array of filter configurations. */
61 /** the number of filters that should be activated for this audio format */
62 unsigned int num_writers;
63 /** Array of writer numbers to be activated. */
65 /** pointer to the array of writer configurations */
67 /** do not start receiver/filters/writer before this time */
68 struct timeval restart_barrier;
72 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
73 * be associated with a receiver/filter/writer triple. This array holds all
74 * information on the status of these slots.
76 * \sa struct slot_info
78 struct slot_info slot[MAX_STREAM_SLOTS];
80 /** The vss status flags audiod is interested in. */
81 enum vss_status_flags {
82 /** Whether the 'N' flag is set. */
83 VSS_STATUS_FLAG_NEXT = 1,
84 /** The 'P' flag is set. */
85 VSS_STATUS_FLAG_PLAYING = 2,
89 * The scheduler instance of para_audiod.
91 * This is needed also in audiod_command.c (for the tasks command), so it can
94 struct sched sched = {.max_fileno = 0};
96 /* The task for obtaining para_server's status (para_client stat). */
98 /** The associated task structure of audiod. */
100 /** Client data associated with the stat task. */
101 struct client_task *ct;
102 /** Do not restart client command until this time. */
103 struct timeval restart_barrier;
104 /** Last time we received status data from para_server. */
105 struct timeval last_status_read;
107 /** The offset value announced by para_server. */
109 /** The length of the current audio file as announced by para_server. */
111 /** The start of the current stream from the view of para_server. */
112 struct timeval server_stream_start;
113 /** The average time deviation between para_server and para_audiod. */
114 struct timeval sa_time_diff;
115 /** Whether client time is ahead of server time. */
116 int sa_time_diff_sign;
117 /** The 'P' and the 'N' flags as announced by para_server. */
118 enum vss_status_flags vss_status;
119 /** Number of times the clock difference is to be checked. */
120 unsigned clock_diff_count;
121 /** When to start the next check for clock difference. */
122 struct timeval clock_diff_barrier;
123 /** Number of the audio format as announced by para_server. */
124 int current_audio_format_num;
125 /* The status task btrn is the child of the client task. */
126 struct btr_node *btrn;
129 /** The array of status items sent by para_server. */
130 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
133 * the current mode of operation of which can be changed by the on/off/cycle
134 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
136 int audiod_status = AUDIOD_ON;
139 * the gengetopt args_info struct that holds information on all command line
142 struct audiod_args_info conf;
144 static char *socket_name;
145 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
147 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
149 static struct status_task status_task_struct;
152 * the task that calls the status command of para_server
154 * \sa struct status_task
156 static struct status_task *stat_task = &status_task_struct;
159 * the task for handling audiod commands
161 * \sa struct task, struct sched
163 struct command_task {
164 /** the local listening socket */
166 /** the associated task structure */
170 /** iterate over all supported audio formats */
171 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
174 * Get the audio format number.
176 * \param name The name of the audio format.
178 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
179 * \a name is not a supported audio format.
181 static int get_audio_format_num(const char *name)
185 while (para_isspace(*name))
187 FOR_EACH_AUDIO_FORMAT(i)
188 if (!strcmp(name, audio_formats[i]))
190 return -E_UNSUPPORTED_AUDIO_FORMAT;
193 static int get_matching_audio_format_nums(const char *re)
198 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
202 FOR_EACH_AUDIO_FORMAT(i)
203 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
210 * Compute the play time based on information of the given slot.
212 * \param slot_num The slot number (negative means: no slot).
214 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
215 * from the status items received from para_server and the start time of the
216 * (first) writer of the given slot.
218 * It has to take into account that the stream was probably not started at
219 * the beginning of the file, that the clock between the server and the client
220 * host may differ and that playback of the stream was delayed, e.g. because
221 * the prebuffer filter is used in the filter configuration of the given slot.
223 * If no writer is active in the given slot, or \a slot_num is negative
224 * (indicating that para_audiod runs in standby mode), an approximation based
225 * only on the status items is computed and the returned string is prefixed
228 * \return A string that must be freed by the caller.
230 char *get_time_string(int slot_num)
232 int ret, seconds = 0, length;
233 struct timeval *tmp, sum, sss, /* server stream start */
234 rstime, /* receiver start time */
235 wstime, /* writer start time */
236 wtime, /* now - writer start */
237 rskip; /* receiver start - sss */
238 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
241 if (audiod_status == AUDIOD_OFF)
243 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
244 if (stat_task->length_seconds) /* paused */
246 goto empty; /* stopped */
248 if (audiod_status == AUDIOD_ON && !s)
251 * Valid status items and playing, set length and tmp to the stream
252 * start. We use the slot info and fall back to the info from current
253 * status items if no slot info is available.
255 length = stat_task->length_seconds;
256 tmp = &stat_task->server_stream_start;
257 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
258 btr_get_node_start(s->wns[0].btrn, &wstime);
259 if (wstime.tv_sec != 0) { /* writer wrote something */
260 if (s->server_stream_start.tv_sec == 0) {
261 /* copy status info to slot */
262 s->server_stream_start = stat_task->server_stream_start;
263 s->offset_seconds = stat_task->offset_seconds;
264 s->seconds_total = stat_task->length_seconds;
266 length = s->seconds_total;
267 tmp = &s->server_stream_start;
270 if (stat_task->sa_time_diff_sign > 0)
271 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
273 tv_add(tmp, &stat_task->sa_time_diff, &sss);
274 if (!s || !s->wns || !s->wns[0].btrn) {
276 tv_diff(now, &sss, &diff);
277 seconds = diff.tv_sec + stat_task->offset_seconds;
280 tv_diff(now, &wstime, &wtime);
281 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
282 seconds = s->offset_seconds;
283 if (s->receiver_node->btrn) {
284 btr_get_node_start(s->receiver_node->btrn, &rstime);
285 ret = tv_diff(&rstime, &sss, &rskip);
286 if (ret > 0) { /* audiod was started in the middle of the stream */
287 tv_add(&wtime, &rskip, &sum);
288 seconds += sum.tv_sec;
290 seconds += wtime.tv_sec;
292 seconds += wtime.tv_sec;
294 seconds = PARA_MIN(seconds, length);
295 seconds = PARA_MAX(seconds, 0);
297 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
301 (length - seconds) / 60,
302 (length - seconds) % 60,
303 length? (seconds * 100 + length / 2) / length : 0,
307 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
310 return para_strdup(NULL);
313 static void parse_config_or_die(void)
317 struct audiod_cmdline_parser_params params = {
321 .check_ambiguity = 0,
325 if (conf.config_file_given)
326 config_file = para_strdup(conf.config_file_arg);
328 char *home = para_homedir();
329 config_file = make_message("%s/.paraslash/audiod.conf", home);
332 ret = file_exists(config_file);
333 if (conf.config_file_given && !ret) {
334 PARA_EMERG_LOG("can not read config file %s\n", config_file);
338 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
339 daemon_set_loglevel(conf.loglevel_arg);
348 static void setup_signal_handling(void)
350 sig_task->fd = para_signal_init();
351 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
352 para_install_sighandler(SIGINT);
353 para_install_sighandler(SIGTERM);
354 para_install_sighandler(SIGHUP);
355 para_sigaction(SIGPIPE, SIG_IGN);
358 static void clear_slot(int slot_num)
360 struct slot_info *s = &slot[slot_num];
362 PARA_INFO_LOG("clearing slot %d\n", slot_num);
363 memset(s, 0, sizeof(struct slot_info));
367 static void close_receiver(int slot_num)
369 struct slot_info *s = &slot[slot_num];
370 struct audio_format_info *a;
372 if (s->format < 0 || !s->receiver_node)
375 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
376 audio_formats[s->format], slot_num);
377 a->receiver->close(s->receiver_node);
378 btr_remove_node(&s->receiver_node->btrn);
379 task_reap(&s->receiver_node->task);
380 free(s->receiver_node);
381 s->receiver_node = NULL;
382 stat_task->current_audio_format_num = -1;
383 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
384 &a->restart_barrier);
387 static void writer_cleanup(struct writer_node *wn)
393 w = writers + wn->writer_num;
394 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
396 btr_remove_node(&wn->btrn);
397 task_reap(&wn->task);
400 static void close_writers(struct slot_info *s)
402 struct audio_format_info *a;
409 if (a->num_writers == 0)
410 writer_cleanup(s->wns);
412 for (i = 0; i < a->num_writers; i++)
413 writer_cleanup(s->wns + i);
419 static void close_filters(struct slot_info *s)
422 struct audio_format_info *a = afi + s->format;
423 if (a->num_filters == 0)
425 for (i = a->num_filters - 1; i >= 0; i--) {
426 struct filter_node *fn = s->fns + i;
431 f = filters + fn->filter_num;
434 btr_remove_node(&fn->btrn);
435 task_reap(&fn->task);
441 static void notify_receivers(int error)
446 struct slot_info *s = slot + i;
449 if (!s->receiver_node)
451 task_notify(s->receiver_node->task, error);
455 static int get_empty_slot(void)
466 if (s->wns || s->receiver_node || s->fns)
471 return -E_NO_MORE_SLOTS;
474 static void open_filters(struct slot_info *s)
476 struct audio_format_info *a = afi + s->format;
477 struct filter_node *fn;
478 int nf = a->num_filters;
479 struct btr_node *parent;
484 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
485 assert(s->fns == NULL);
486 s->fns = para_calloc(nf * sizeof(struct filter_node));
487 parent = s->receiver_node->btrn;
488 for (i = 0; i < nf; i++) {
490 struct filter *f = filters + a->filter_nums[i];
492 fn->filter_num = a->filter_nums[i];
493 fn->conf = a->filter_conf[i];
494 fn->btrn = btr_new_node(&(struct btr_node_description)
495 EMBRACE(.name = f->name, .parent = parent,
496 .handler = f->execute, .context = fn));
499 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
500 fn->task = task_register(&(struct task_info) {
502 .pre_select = f->pre_select,
503 .post_select = f->post_select,
507 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
508 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
512 static void open_writers(struct slot_info *s)
515 struct audio_format_info *a = afi + s->format;
516 struct writer_node *wn;
517 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
519 assert(s->wns == NULL);
520 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
521 * sizeof(struct writer_node));
522 for (i = 0; i < a->num_writers; i++) {
524 wn->conf = a->writer_conf[i];
525 wn->writer_num = a->writer_nums[i];
526 register_writer_node(wn, parent, &sched);
527 PARA_NOTICE_LOG("%s writer started in slot %d\n",
528 writer_names[a->writer_nums[i]], (int)(s - slot));
532 /* returns slot num on success */
533 static int open_receiver(int format)
535 struct audio_format_info *a = &afi[format];
538 struct receiver *r = a->receiver;
539 struct receiver_node *rn;
541 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
542 ret = get_empty_slot();
546 rn = para_calloc(sizeof(*rn));
548 rn->conf = a->receiver_conf;
549 rn->btrn = btr_new_node(&(struct btr_node_description)
550 EMBRACE(.name = r->name, .context = rn));
553 btr_remove_node(&rn->btrn);
559 s->receiver_node = rn;
560 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
561 audio_formats[format], r->name, slot_num);
562 rn->task = task_register(&(struct task_info) {
564 .pre_select = r->pre_select,
565 .post_select = r->post_select,
571 static bool receiver_running(void)
574 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
577 struct slot_info *s = &slot[i];
578 long unsigned ss2 = s->server_stream_start.tv_sec;
580 if (!s->receiver_node)
582 if (task_status(s->receiver_node->task) >= 0)
591 * Return the root node of the current buffer tree.
593 * This is only used for stream grabbing.
595 * \return \p NULL if no slot is currently active. If more than one buffer tree
596 * exists, the node corresponding to the most recently started receiver is
599 struct btr_node *audiod_get_btr_root(void)
601 int i, newest_slot = -1;
602 struct timeval newest_rstime = {0, 0};
605 struct slot_info *s = &slot[i];
606 struct timeval rstime;
607 if (!s->receiver_node)
609 if (task_status(s->receiver_node->task) < 0)
611 btr_get_node_start(s->receiver_node->btrn, &rstime);
612 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
614 newest_rstime = rstime;
617 if (newest_slot == -1)
619 return slot[newest_slot].receiver_node->btrn;
622 /* whether a new instance of a decoder should be started. */
623 static bool must_start_decoder(void)
625 int cafn = stat_task->current_audio_format_num;
626 unsigned vs = stat_task->vss_status;
628 if (audiod_status != AUDIOD_ON)
634 if (vs & VSS_STATUS_FLAG_NEXT)
636 if (!(vs & VSS_STATUS_FLAG_PLAYING))
638 if (receiver_running())
640 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
645 static void compute_time_diff(const struct timeval *status_time)
647 struct timeval tmp, diff;
648 static unsigned count;
649 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
650 const struct timeval max_deviation = {0, 500 * 1000};
651 const int time_smooth = 5;
653 sign = tv_diff(status_time, now, &diff);
654 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
655 // sign, sa_time_diff_sign);
657 sa_time_diff_sign = sign;
658 stat_task->sa_time_diff = diff;
663 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
664 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
665 PARA_WARNING_LOG("time diff jump: %lims\n",
669 sa_time_diff_sign = tv_convex_combination(
670 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
671 count > 10? sign : sign * time_smooth, &diff,
673 stat_task->sa_time_diff = tmp;
674 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
677 sa_time_diff_sign < 0? "-" : "+",
678 tv2ms(&stat_task->sa_time_diff)
681 stat_task->sa_time_diff_sign = sa_time_diff_sign;
684 static int update_item(int itemnum, char *buf)
686 long unsigned sec, usec;
688 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
690 free(stat_item_values[itemnum]);
691 stat_item_values[itemnum] = para_strdup(buf);
692 stat_client_write_item(itemnum);
694 case SI_STATUS_FLAGS:
695 stat_task->vss_status = 0;
696 if (strchr(buf, 'N'))
697 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
698 if (strchr(buf, 'P'))
699 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
702 stat_task->offset_seconds = atoi(buf);
704 case SI_SECONDS_TOTAL:
705 stat_task->length_seconds = atoi(buf);
707 case SI_STREAM_START:
708 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
709 stat_task->server_stream_start.tv_sec = sec;
710 stat_task->server_stream_start.tv_usec = usec;
713 case SI_CURRENT_TIME:
714 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
715 struct timeval tv = {sec, usec};
716 compute_time_diff(&tv);
720 stat_task->current_audio_format_num
721 = get_audio_format_num(buf);
726 static int parse_stream_command(const char *txt, char **cmd)
729 char *re, *p = strchr(txt, ':');
732 return -E_MISSING_COLON;
735 re = malloc(len + 1);
736 strncpy(re, txt, len);
738 ret = get_matching_audio_format_nums(re);
743 static int add_filter(int format, char *cmdline)
745 struct audio_format_info *a = &afi[format];
746 int filter_num, nf = a->num_filters;
749 filter_num = check_filter_arg(cmdline, &cfg);
752 a->filter_conf = para_realloc(a->filter_conf,
753 (nf + 1) * sizeof(void *));
754 a->filter_nums = para_realloc(a->filter_nums,
755 (nf + 1) * sizeof(unsigned));
756 a->filter_nums[nf] = filter_num;
757 a->filter_conf[nf] = cfg;
759 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
760 filters[filter_num].name);
764 static int parse_writer_args(void)
768 struct audio_format_info *a;
770 for (i = 0; i < conf.writer_given; i++) {
772 int j, nw, writer_num, af_mask;
774 ret = parse_stream_command(conf.writer_arg[i], &cmd);
778 FOR_EACH_AUDIO_FORMAT(j) {
780 if ((af_mask & (1 << j)) == 0) /* no match */
782 wconf = check_writer_arg_or_die(cmd, &writer_num);
784 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
785 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
786 a->writer_nums[nw] = writer_num;
787 a->writer_conf[nw] = wconf;
788 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
789 nw, writer_names[writer_num]);
793 /* Use default writer for audio formats which are not yet set up. */
794 FOR_EACH_AUDIO_FORMAT(i) {
798 if (a->num_writers > 0)
799 continue; /* already set up */
800 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
801 a->writer_nums = para_malloc(sizeof(int));
802 a->writer_nums[0] = writer_num;
803 a->writer_conf = para_malloc(sizeof(void *));
804 a->writer_conf[0] = writer_conf;
806 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
807 writer_names[writer_num]);
812 static int parse_receiver_args(void)
814 int i, ret, receiver_num;
816 struct audio_format_info *a;
818 for (i = conf.receiver_given - 1; i >= 0; i--) {
822 ret = parse_stream_command(conf.receiver_arg[i], &arg);
826 FOR_EACH_AUDIO_FORMAT(j) {
828 if ((af_mask & (1 << j)) == 0) /* no match */
831 * If multiple receivers are given for this audio format, the
832 * last one wins and we have to free the previous receiver
833 * config here. Since we are iterating backwards, the winning
834 * receiver arg is in fact the first one given.
836 if (a->receiver_conf)
837 a->receiver->free_config(a->receiver_conf);
838 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
839 ret = -E_RECV_SYNTAX;
840 if (!a->receiver_conf)
842 a->receiver = receivers + receiver_num;
846 * Use the first available receiver with no arguments for those audio
847 * formats for which no receiver was specified.
849 cmd = para_strdup(receivers[0].name);
850 FOR_EACH_AUDIO_FORMAT(i) {
852 if (a->receiver_conf)
854 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
855 if (!a->receiver_conf)
856 return -E_RECV_SYNTAX;
857 a->receiver = &receivers[receiver_num];
859 FOR_EACH_AUDIO_FORMAT(i) {
861 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
862 audio_formats[i], a->receiver->name);
870 static int init_default_filters(void)
874 FOR_EACH_AUDIO_FORMAT(i) {
875 struct audio_format_info *a = &afi[i];
880 continue; /* no default -- nothing to to */
882 * udp and dccp streams are fec-encoded, so add fecdec as the
885 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
886 strcmp(afi[i].receiver->name, "dccp") == 0) {
887 tmp = para_strdup("fecdec");
893 /* add "dec" to audio format name */
894 tmp = make_message("%sdec", audio_formats[i]);
895 for (j = 0; filters[j].name; j++)
896 if (!strcmp(tmp, filters[j].name))
899 ret = -E_UNSUPPORTED_FILTER;
900 if (!filters[j].name)
902 tmp = para_strdup(filters[j].name);
903 ret = add_filter(i, tmp);
907 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
914 static int parse_filter_args(void)
916 int i, j, ret, af_mask, num_matches;
918 for (i = 0; i < conf.filter_given; i++) {
920 ret = parse_stream_command(conf.filter_arg[i], &arg);
925 FOR_EACH_AUDIO_FORMAT(j) {
926 if ((af_mask & (1 << j)) == 0) /* no match */
928 ret = add_filter(j, arg);
933 if (num_matches == 0)
934 PARA_WARNING_LOG("ignoring filter spec: %s\n",
937 ret = init_default_filters(); /* use default values for the rest */
942 static int parse_stream_args(void)
946 ret = parse_receiver_args();
949 ret = parse_filter_args();
952 ret = parse_writer_args();
958 /* does not unlink socket on errors */
959 static int audiod_get_socket(void)
961 struct sockaddr_un unix_addr;
964 if (conf.socket_given)
965 socket_name = para_strdup(conf.socket_arg);
967 char *hn = para_hostname();
968 socket_name = make_message("/var/paraslash/audiod_socket.%s",
972 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
973 if (conf.force_given)
975 ret = create_local_socket(socket_name, &unix_addr,
976 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
980 if (listen(fd , 5) < 0) {
981 ret = -ERRNO_TO_PARA_ERROR(errno);
984 ret = mark_fd_nonblocking(fd);
989 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
993 static void signal_pre_select(struct sched *s, void *context)
995 struct signal_task *st = context;
996 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
999 static int signal_post_select(struct sched *s, void *context)
1001 struct signal_task *st = context;
1004 ret = task_get_notification(st->task);
1007 signum = para_next_signal(&s->rfds);
1012 PARA_NOTICE_LOG("received signal %d\n", signum);
1013 task_notify_all(s, E_AUDIOD_SIGNAL);
1014 return -E_AUDIOD_SIGNAL;
1019 static void command_pre_select(struct sched *s, void *context)
1021 struct command_task *ct = context;
1022 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1025 static int command_post_select(struct sched *s, void *context)
1028 struct command_task *ct = context;
1029 static struct timeval last_status_dump;
1030 struct timeval tmp, delay;
1033 ret = task_get_notification(ct->task);
1036 ret = handle_connect(ct->fd, &s->rfds);
1038 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1039 if (ret == -E_AUDIOD_TERM) {
1040 task_notify_all(s, -ret);
1046 /* if last status dump was less than 500ms ago, do nothing */
1048 delay.tv_usec = 500 * 1000;
1049 tv_add(&last_status_dump, &delay, &tmp);
1050 if (tv_diff(now, &tmp, NULL) < 0)
1054 * If last status dump was more than 5s ago, force update. Otherwise,
1055 * update only those items that have changed.
1059 tv_add(&last_status_dump, &delay, &tmp);
1060 if (tv_diff(now, &tmp, NULL) < 0)
1063 audiod_status_dump(force);
1064 last_status_dump = *now;
1068 static void init_command_task(struct command_task *ct)
1070 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1072 ct->task = task_register(&(struct task_info) {
1074 .pre_select = command_pre_select,
1075 .post_select = command_post_select,
1080 static void close_stat_pipe(void)
1084 task_reap(&stat_task->ct->task);
1085 client_close(stat_task->ct);
1086 stat_task->ct = NULL;
1087 clear_and_dump_items();
1088 stat_task->length_seconds = 0;
1089 stat_task->offset_seconds = 0;
1090 stat_task->vss_status = 0;
1091 stat_task->current_audio_format_num = -1;
1092 audiod_status_dump(true);
1095 /* avoid busy loop if server is down */
1096 static void set_stat_task_restart_barrier(unsigned seconds)
1098 struct timeval delay = {seconds, 0};
1099 tv_add(now, &delay, &stat_task->restart_barrier);
1102 static bool must_close_slot(int slot_num)
1104 struct slot_info *s = &slot[slot_num];
1105 struct audio_format_info *a = afi + s->format;
1110 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1112 for (i = 0; i < a->num_filters; i++)
1113 if (s->fns && task_status(s->fns[i].task) >= 0)
1115 if (a->num_writers > 0) {
1116 for (i = 0; i < a->num_writers; i++)
1117 if (s->wns && task_status(s->wns[i].task) >= 0)
1120 if (s->wns && task_status(s->wns[0].task) >= 0)
1126 static void close_slot(int slot_num)
1128 struct slot_info *s = slot + slot_num;
1130 PARA_INFO_LOG("closing slot %d\n", slot_num);
1133 close_receiver(slot_num);
1134 clear_slot(slot_num);
1137 static void close_unused_slots(void)
1142 if (must_close_slot(i))
1147 * Cleanup all resources.
1149 * This performs various cleanups, removes the audiod socket and closes the
1150 * connection to para_server.
1152 static void audiod_cleanup(void)
1155 unlink(socket_name);
1157 close_unused_slots();
1158 audiod_cmdline_parser_free(&conf);
1159 close_stat_clients();
1163 * Check if any receivers/filters/writers need to be started and do so if
1166 static void start_stop_decoders(void)
1169 struct slot_info *sl;
1171 close_unused_slots();
1172 if (audiod_status != AUDIOD_ON ||
1173 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1174 return notify_receivers(E_NOT_PLAYING);
1175 if (!must_start_decoder())
1177 ret = open_receiver(stat_task->current_audio_format_num);
1179 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1185 activate_grab_clients(&sched);
1186 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1189 static void status_pre_select(struct sched *s, void *context)
1191 struct status_task *st = context;
1192 int i, ret, cafn = stat_task->current_audio_format_num;
1194 if (must_start_decoder())
1197 if (must_close_slot(i))
1199 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1202 if (st->ct && audiod_status == AUDIOD_OFF)
1204 if (!st->ct && audiod_status != AUDIOD_OFF)
1205 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1207 sched_request_barrier(&afi[cafn].restart_barrier, s);
1209 * If para_server is playing we'd like to have a smooth time display
1210 * even if we are running in standby mode. So we request a timeout that
1211 * expires at the next full second.
1213 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1214 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1220 /* restart the client task if necessary */
1221 static int status_post_select(struct sched *s, void *context)
1223 struct status_task *st = context;
1226 ret = task_get_notification(st->task);
1229 if (audiod_status == AUDIOD_OFF) {
1232 if (task_status(st->ct->task) >= 0) {
1233 task_notify(st->ct->task, E_AUDIOD_OFF);
1237 st->clock_diff_count = conf.clock_diff_count_arg;
1244 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1249 if (st->ct->status != CL_EXECUTING)
1252 struct timeval diff;
1253 tv_diff(now, &st->last_status_read, &diff);
1254 if (diff.tv_sec > 61)
1255 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1258 btr_merge(st->btrn, st->min_iqs);
1259 sz = btr_next_buffer(st->btrn, &buf);
1260 ret = for_each_stat_item(buf, sz, update_item);
1262 task_notify(st->ct->task, -ret);
1266 btr_consume(st->btrn, sz - ret);
1267 st->last_status_read = *now;
1269 } else /* current status item crosses buffers */
1270 st->min_iqs = sz + 1;
1273 btr_drain(st->btrn);
1274 st->current_audio_format_num = -1;
1275 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1277 if (st->clock_diff_count) { /* get status only one time */
1278 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1280 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1281 st->clock_diff_count--;
1282 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1283 set_stat_task_restart_barrier(2);
1286 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1288 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1289 set_stat_task_restart_barrier(5);
1291 free(stat_item_values[SI_BASENAME]);
1292 stat_item_values[SI_BASENAME] = para_strdup(
1293 "no connection to para_server");
1294 stat_client_write_item(SI_BASENAME);
1295 st->last_status_read = *now;
1297 start_stop_decoders();
1301 static void init_status_task(struct status_task *st)
1303 memset(st, 0, sizeof(struct status_task));
1304 st->sa_time_diff_sign = 1;
1305 st->clock_diff_count = conf.clock_diff_count_arg;
1306 st->current_audio_format_num = -1;
1307 st->btrn = btr_new_node(&(struct btr_node_description)
1308 EMBRACE(.name = "stat"));
1310 stat_task->task = task_register(&(struct task_info) {
1312 .pre_select = status_pre_select,
1313 .post_select = status_post_select,
1314 .context = stat_task,
1318 static void set_initial_status(void)
1320 audiod_status = AUDIOD_ON;
1321 if (!conf.mode_given)
1323 if (!strcmp(conf.mode_arg, "sb")) {
1324 audiod_status = AUDIOD_STANDBY;
1327 if (!strcmp(conf.mode_arg, "off")) {
1328 audiod_status = AUDIOD_OFF;
1331 if (strcmp(conf.mode_arg, "on"))
1332 PARA_WARNING_LOG("invalid mode\n");
1335 __noreturn static void print_help_and_die(void)
1337 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1338 bool d = conf.detailed_help_given;
1341 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1342 ggo_print_help(&h, flags);
1344 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1345 print_receiver_helps(flags);
1346 print_filter_helps(flags);
1347 print_writer_helps(flags);
1352 * the main function of para_audiod
1354 * \param argc usual argument count
1355 * \param argv usual argument vector
1357 * \return EXIT_SUCCESS or EXIT_FAILURE
1359 * \sa para_audiod(1)
1361 int main(int argc, char *argv[])
1364 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1365 struct audiod_cmdline_parser_params params = {
1368 .check_required = 0,
1369 .check_ambiguity = 0,
1374 audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms);
1375 daemon_set_loglevel(conf.loglevel_arg);
1376 version_handle_flag("audiod", conf.version_given);
1377 /* init receivers/filters/writers early to make help work */
1381 if (conf.help_given || conf.detailed_help_given)
1382 print_help_and_die();
1383 daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1384 parse_config_or_die();
1385 daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1386 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1387 init_random_seed_or_die();
1388 daemon_set_flag(DF_LOG_TIME);
1389 daemon_set_flag(DF_LOG_HOSTNAME);
1390 daemon_set_flag(DF_LOG_LL);
1391 if (conf.log_timing_given)
1392 daemon_set_flag(DF_LOG_TIMING);
1393 if (conf.logfile_given) {
1394 daemon_set_logfile(conf.logfile_arg);
1395 daemon_open_log_or_die();
1397 ret = parse_stream_args();
1399 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1402 daemon_log_welcome("para_audiod");
1403 daemon_set_start_time();
1404 set_initial_status();
1407 setup_signal_handling();
1409 init_status_task(stat_task);
1410 init_command_task(cmd_task);
1412 if (conf.daemon_given)
1413 daemonize(false /* parent exits immediately */);
1415 sig_task->task = task_register(&(struct task_info) {
1417 .pre_select = signal_pre_select,
1418 .post_select = signal_post_select,
1419 .context = sig_task,
1422 sched.default_timeout.tv_sec = 2;
1423 sched.default_timeout.tv_usec = 999 * 1000;
1424 ret = schedule(&sched);
1426 sched_shutdown(&sched);
1429 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1430 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;