2 * Copyright (C) 2005-2014 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. */
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};
97 * The task for obtaining para_server's status (para_client stat).
99 * \sa struct task, struct sched.
102 /** The associated task structure of audiod. */
104 /** Client data associated with the stat task. */
105 struct client_task *ct;
106 /** Do not restart client command until this time. */
107 struct timeval restart_barrier;
108 /** Last time we received status data from para_server. */
109 struct timeval last_status_read;
111 /** The offset value announced by para_server. */
113 /** The length of the current audio file as announced by para_server. */
115 /** The start of the current stream from the view of para_server. */
116 struct timeval server_stream_start;
117 /** The average time deviation between para_server and para_audiod. */
118 struct timeval sa_time_diff;
119 /** Whether client time is ahead of server time. */
120 int sa_time_diff_sign;
121 /** The 'P' and the 'N' flags as announced by para_server. */
122 enum vss_status_flags vss_status;
123 /** Number of times the clock difference is to be checked. */
124 unsigned clock_diff_count;
125 /** When to start the next check for clock difference. */
126 struct timeval clock_diff_barrier;
127 /** Number of the audio format as announced by para_server. */
128 int current_audio_format_num;
129 /* The status task btrn is the child of the client task. */
130 struct btr_node *btrn;
133 /** The array of status items sent by para_server. */
134 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
137 * the current mode of operation of which can be changed by the on/off/cycle
138 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
140 int audiod_status = AUDIOD_ON;
143 * the gengetopt args_info struct that holds information on all command line
146 struct audiod_args_info conf;
148 static char *socket_name;
149 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
151 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
153 static struct status_task status_task_struct;
156 * the task that calls the status command of para_server
158 * \sa struct status_task
160 static struct status_task *stat_task = &status_task_struct;
163 * the task for handling audiod commands
165 * \sa struct task, struct sched
167 struct command_task {
168 /** the local listening socket */
170 /** the associated task structure */
174 /** iterate over all supported audio formats */
175 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
178 * Get the audio format number.
180 * \param name The name of the audio format.
182 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
183 * \a name is not a supported audio format.
185 static int get_audio_format_num(const char *name)
189 while (para_isspace(*name))
191 FOR_EACH_AUDIO_FORMAT(i)
192 if (!strcmp(name, audio_formats[i]))
194 return -E_UNSUPPORTED_AUDIO_FORMAT;
197 static int get_matching_audio_format_nums(const char *re)
202 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
206 FOR_EACH_AUDIO_FORMAT(i)
207 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
214 * Compute the play time based on information of the given slot.
216 * \param slot_num The slot number (negative means: no slot).
218 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
219 * from the status items received from para_server and the start time of the
220 * (first) writer of the given slot.
222 * It has to take into account that the stream was probably not started at
223 * the beginning of the file, that the clock between the server and the client
224 * host may differ and that playback of the stream was delayed, e.g. because
225 * the prebuffer filter is used in the filter configuration of the given slot.
227 * If no writer is active in the given slot, or \a slot_num is negative
228 * (indicating that para_audiod runs in standby mode), an approximation based
229 * only on the status items is computed and the returned string is prefixed
232 * \return A string that must be freed by the caller.
234 char *get_time_string(int slot_num)
236 int ret, seconds = 0, length;
237 struct timeval *tmp, sum, sss, /* server stream start */
238 rstime, /* receiver start time */
239 wstime, /* writer start time */
240 wtime, /* now - writer start */
241 rskip; /* receiver start - sss */
242 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
245 if (audiod_status == AUDIOD_OFF)
247 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
248 if (stat_task->length_seconds) /* paused */
250 goto empty; /* stopped */
252 if (audiod_status == AUDIOD_ON && !s)
255 * Valid status items and playing, set length and tmp to the stream
256 * start. We use the slot info and fall back to the info from current
257 * status items if no slot info is available.
259 length = stat_task->length_seconds;
260 tmp = &stat_task->server_stream_start;
261 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
262 btr_get_node_start(s->wns[0].btrn, &wstime);
263 if (wstime.tv_sec != 0) { /* writer wrote something */
264 if (s->server_stream_start.tv_sec == 0) {
265 /* copy status info to slot */
266 s->server_stream_start = stat_task->server_stream_start;
267 s->offset_seconds = stat_task->offset_seconds;
268 s->seconds_total = stat_task->length_seconds;
270 length = s->seconds_total;
271 tmp = &s->server_stream_start;
274 if (stat_task->sa_time_diff_sign > 0)
275 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
277 tv_add(tmp, &stat_task->sa_time_diff, &sss);
278 if (!s || !s->wns || !s->wns[0].btrn) {
280 tv_diff(now, &sss, &diff);
281 seconds = diff.tv_sec + stat_task->offset_seconds;
284 tv_diff(now, &wstime, &wtime);
285 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
286 seconds = s->offset_seconds;
287 if (s->receiver_node->btrn) {
288 btr_get_node_start(s->receiver_node->btrn, &rstime);
289 ret = tv_diff(&rstime, &sss, &rskip);
290 if (ret > 0) { /* audiod was started in the middle of the stream */
291 tv_add(&wtime, &rskip, &sum);
292 seconds += sum.tv_sec;
294 seconds += wtime.tv_sec;
296 seconds += wtime.tv_sec;
298 seconds = PARA_MIN(seconds, length);
299 seconds = PARA_MAX(seconds, 0);
301 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
305 (length - seconds) / 60,
306 (length - seconds) % 60,
307 length? (seconds * 100 + length / 2) / length : 0,
311 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
314 return para_strdup(NULL);
317 static int want_colors(void)
319 if (conf.color_arg == color_arg_no)
321 if (conf.color_arg == color_arg_yes)
323 if (conf.logfile_given)
325 return isatty(STDERR_FILENO);
328 static void parse_config_or_die(void)
332 struct audiod_cmdline_parser_params params = {
336 .check_ambiguity = 0,
340 if (conf.config_file_given)
341 config_file = para_strdup(conf.config_file_arg);
343 char *home = para_homedir();
344 config_file = make_message("%s/.paraslash/audiod.conf", home);
347 ret = file_exists(config_file);
348 if (conf.config_file_given && !ret) {
349 PARA_EMERG_LOG("can not read config file %s\n", config_file);
353 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
354 daemon_set_loglevel(conf.loglevel_arg);
363 static void setup_signal_handling(void)
365 sig_task->fd = para_signal_init();
366 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
367 para_install_sighandler(SIGINT);
368 para_install_sighandler(SIGTERM);
369 para_install_sighandler(SIGHUP);
370 para_sigaction(SIGPIPE, SIG_IGN);
373 static void clear_slot(int slot_num)
375 struct slot_info *s = &slot[slot_num];
377 PARA_INFO_LOG("clearing slot %d\n", slot_num);
378 memset(s, 0, sizeof(struct slot_info));
382 static void close_receiver(int slot_num)
384 struct slot_info *s = &slot[slot_num];
385 struct audio_format_info *a;
387 if (s->format < 0 || !s->receiver_node)
390 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
391 audio_formats[s->format], slot_num);
392 a->receiver->close(s->receiver_node);
393 btr_remove_node(&s->receiver_node->btrn);
394 task_reap(&s->receiver_node->task);
395 free(s->receiver_node);
396 s->receiver_node = NULL;
397 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
398 &a->restart_barrier);
401 static void writer_cleanup(struct writer_node *wn)
407 w = writers + wn->writer_num;
408 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
410 btr_remove_node(&wn->btrn);
411 task_reap(&wn->task);
414 static void close_writers(struct slot_info *s)
416 struct audio_format_info *a;
423 if (a->num_writers == 0)
424 writer_cleanup(s->wns);
426 for (i = 0; i < a->num_writers; i++)
427 writer_cleanup(s->wns + i);
433 static void close_filters(struct slot_info *s)
436 struct audio_format_info *a = afi + s->format;
437 if (a->num_filters == 0)
439 for (i = a->num_filters - 1; i >= 0; i--) {
440 struct filter_node *fn = s->fns + i;
445 f = filters + fn->filter_num;
448 btr_remove_node(&fn->btrn);
449 task_reap(&fn->task);
455 static void notify_receivers(int error)
460 struct slot_info *s = slot + i;
463 if (!s->receiver_node)
465 task_notify(s->receiver_node->task, error);
469 static int get_empty_slot(void)
480 if (s->wns || s->receiver_node || s->fns)
485 return -E_NO_MORE_SLOTS;
488 static void open_filters(struct slot_info *s)
490 struct audio_format_info *a = afi + s->format;
491 struct filter_node *fn;
492 int nf = a->num_filters;
493 struct btr_node *parent;
498 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
499 assert(s->fns == NULL);
500 s->fns = para_calloc(nf * sizeof(struct filter_node));
501 parent = s->receiver_node->btrn;
502 for (i = 0; i < nf; i++) {
504 struct filter *f = filters + a->filter_nums[i];
506 fn->filter_num = a->filter_nums[i];
507 fn->conf = a->filter_conf[i];
508 fn->btrn = btr_new_node(&(struct btr_node_description)
509 EMBRACE(.name = f->name, .parent = parent,
510 .handler = f->execute, .context = fn));
513 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
514 fn->task = task_register(&(struct task_info) {
516 .pre_select = f->pre_select,
517 .post_select = f->post_select,
521 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
522 audio_formats[s->format], i, nf, 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 for (i = 0; i < a->num_writers; i++) {
538 wn->conf = a->writer_conf[i];
539 wn->writer_num = a->writer_nums[i];
540 register_writer_node(wn, parent, &sched);
541 PARA_NOTICE_LOG("%s writer started in slot %d\n",
542 writer_names[a->writer_nums[i]], (int)(s - slot));
546 /* returns slot num on success */
547 static int open_receiver(int format)
549 struct audio_format_info *a = &afi[format];
552 struct receiver *r = a->receiver;
553 struct receiver_node *rn;
555 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
556 ret = get_empty_slot();
560 rn = para_calloc(sizeof(*rn));
562 rn->conf = a->receiver_conf;
563 rn->btrn = btr_new_node(&(struct btr_node_description)
564 EMBRACE(.name = r->name, .context = rn));
567 btr_remove_node(&rn->btrn);
573 s->receiver_node = rn;
574 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
575 audio_formats[format], r->name, slot_num);
576 rn->task = task_register(&(struct task_info) {
578 .pre_select = r->pre_select,
579 .post_select = r->post_select,
585 static bool receiver_running(void)
588 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
591 struct slot_info *s = &slot[i];
592 long unsigned ss2 = s->server_stream_start.tv_sec;
594 if (!s->receiver_node)
596 if (task_status(s->receiver_node->task) >= 0)
605 * Return the root node of the current buffer tree.
607 * This is only used for stream grabbing.
609 * \return \p NULL if no slot is currently active. If more than one buffer tree
610 * exists, the node corresponding to the most recently started receiver is
613 struct btr_node *audiod_get_btr_root(void)
615 int i, newest_slot = -1;
616 struct timeval newest_rstime = {0, 0};
619 struct slot_info *s = &slot[i];
620 struct timeval rstime;
621 if (!s->receiver_node)
623 if (task_status(s->receiver_node->task) < 0)
625 btr_get_node_start(s->receiver_node->btrn, &rstime);
626 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
628 newest_rstime = rstime;
631 if (newest_slot == -1)
633 return slot[newest_slot].receiver_node->btrn;
636 /* whether a new instance of a decoder should be started. */
637 static bool must_start_decoder(void)
639 int cafn = stat_task->current_audio_format_num;
640 unsigned vs = stat_task->vss_status;
642 if (audiod_status != AUDIOD_ON)
648 if (vs & VSS_STATUS_FLAG_NEXT)
650 if (!(vs & VSS_STATUS_FLAG_PLAYING))
652 if (receiver_running())
654 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
659 static void compute_time_diff(const struct timeval *status_time)
661 struct timeval tmp, diff;
662 static unsigned count;
663 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
664 const struct timeval max_deviation = {0, 500 * 1000};
665 const int time_smooth = 5;
667 sign = tv_diff(status_time, now, &diff);
668 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
669 // sign, sa_time_diff_sign);
671 sa_time_diff_sign = sign;
672 stat_task->sa_time_diff = diff;
677 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
678 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
679 PARA_WARNING_LOG("time diff jump: %lims\n",
683 sa_time_diff_sign = tv_convex_combination(
684 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
685 count > 10? sign : sign * time_smooth, &diff,
687 stat_task->sa_time_diff = tmp;
688 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
691 sa_time_diff_sign < 0? "-" : "+",
692 tv2ms(&stat_task->sa_time_diff)
695 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) {
812 if (a->num_writers > 0)
813 continue; /* already set up */
814 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
815 a->writer_nums = para_malloc(sizeof(int));
816 a->writer_nums[0] = writer_num;
817 a->writer_conf = para_malloc(sizeof(void *));
818 a->writer_conf[0] = writer_conf;
820 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
821 writer_names[writer_num]);
826 static int parse_receiver_args(void)
828 int i, ret, receiver_num;
830 struct audio_format_info *a;
832 for (i = conf.receiver_given - 1; i >= 0; i--) {
836 ret = parse_stream_command(conf.receiver_arg[i], &arg);
840 FOR_EACH_AUDIO_FORMAT(j) {
842 if ((af_mask & (1 << j)) == 0) /* no match */
845 * If multiple receivers are given for this audio format, the
846 * last one wins and we have to free the previous receiver
847 * config here. Since we are iterating backwards, the winning
848 * receiver arg is in fact the first one given.
850 if (a->receiver_conf)
851 a->receiver->free_config(a->receiver_conf);
852 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
853 ret = -E_RECV_SYNTAX;
854 if (!a->receiver_conf)
856 a->receiver = receivers + receiver_num;
860 * Use the first available receiver with no arguments for those audio
861 * formats for which no receiver was specified.
863 cmd = para_strdup(receivers[0].name);
864 FOR_EACH_AUDIO_FORMAT(i) {
866 if (a->receiver_conf)
868 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
869 if (!a->receiver_conf)
870 return -E_RECV_SYNTAX;
871 a->receiver = &receivers[receiver_num];
873 FOR_EACH_AUDIO_FORMAT(i) {
875 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
876 audio_formats[i], a->receiver->name);
884 static int init_default_filters(void)
888 FOR_EACH_AUDIO_FORMAT(i) {
889 struct audio_format_info *a = &afi[i];
894 continue; /* no default -- nothing to to */
896 * udp and dccp streams are fec-encoded, so add fecdec as the
899 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
900 strcmp(afi[i].receiver->name, "dccp") == 0) {
901 tmp = para_strdup("fecdec");
907 /* add "dec" to audio format name */
908 tmp = make_message("%sdec", audio_formats[i]);
909 for (j = 0; filters[j].name; j++)
910 if (!strcmp(tmp, filters[j].name))
913 ret = -E_UNSUPPORTED_FILTER;
914 if (!filters[j].name)
916 tmp = para_strdup(filters[j].name);
917 ret = add_filter(i, tmp);
921 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
928 static int parse_filter_args(void)
930 int i, j, ret, af_mask, num_matches;
932 for (i = 0; i < conf.filter_given; i++) {
934 ret = parse_stream_command(conf.filter_arg[i], &arg);
939 FOR_EACH_AUDIO_FORMAT(j) {
940 if ((af_mask & (1 << j)) == 0) /* no match */
942 ret = add_filter(j, arg);
947 if (num_matches == 0)
948 PARA_WARNING_LOG("ignoring filter spec: %s\n",
951 ret = init_default_filters(); /* use default values for the rest */
956 static int parse_stream_args(void)
960 ret = parse_receiver_args();
963 ret = parse_filter_args();
966 ret = parse_writer_args();
972 /* does not unlink socket on errors */
973 static int audiod_get_socket(void)
975 struct sockaddr_un unix_addr;
978 if (conf.socket_given)
979 socket_name = para_strdup(conf.socket_arg);
981 char *hn = para_hostname();
982 socket_name = make_message("/var/paraslash/audiod_socket.%s",
986 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
987 if (conf.force_given)
989 ret = create_local_socket(socket_name, &unix_addr,
990 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
994 if (listen(fd , 5) < 0) {
995 ret = -ERRNO_TO_PARA_ERROR(errno);
998 ret = mark_fd_nonblocking(fd);
1003 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1007 static void signal_pre_select(struct sched *s, struct task *t)
1009 struct signal_task *st = task_context(t);
1010 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1013 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1017 signum = para_next_signal(&s->rfds);
1022 PARA_NOTICE_LOG("received signal %d\n", signum);
1023 clean_exit(EXIT_FAILURE, "caught deadly signal");
1028 static void command_pre_select(struct sched *s, struct task *t)
1030 struct command_task *ct = task_context(t);
1031 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1034 static int command_post_select(struct sched *s, struct task *t)
1037 struct command_task *ct = task_context(t);
1038 static struct timeval last_status_dump;
1039 struct timeval tmp, delay;
1042 ret = handle_connect(ct->fd, &s->rfds);
1044 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1048 /* if last status dump was less than 500ms ago, do nothing */
1050 delay.tv_usec = 500 * 1000;
1051 tv_add(&last_status_dump, &delay, &tmp);
1052 if (tv_diff(now, &tmp, NULL) < 0)
1056 * If last status dump was more than 5s ago, force update. Otherwise,
1057 * update only those items that have changed.
1061 tv_add(&last_status_dump, &delay, &tmp);
1062 if (tv_diff(now, &tmp, NULL) < 0)
1065 audiod_status_dump(force);
1066 last_status_dump = *now;
1070 static void init_command_task(struct command_task *ct)
1072 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1074 ct->task = task_register(&(struct task_info) {
1076 .pre_select = command_pre_select,
1077 .post_select = command_post_select,
1082 static void close_stat_pipe(void)
1086 client_close(stat_task->ct);
1087 task_reap(&stat_task->ct->task);
1088 stat_task->ct = NULL;
1089 clear_and_dump_items();
1090 stat_task->length_seconds = 0;
1091 stat_task->offset_seconds = 0;
1092 stat_task->vss_status = 0;
1093 stat_task->current_audio_format_num = -1;
1094 audiod_status_dump(true);
1097 /* avoid busy loop if server is down */
1098 static void set_stat_task_restart_barrier(unsigned seconds)
1100 struct timeval delay = {seconds, 0};
1101 tv_add(now, &delay, &stat_task->restart_barrier);
1104 static bool must_close_slot(int slot_num)
1106 struct slot_info *s = &slot[slot_num];
1107 struct audio_format_info *a = afi + s->format;
1112 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1114 for (i = 0; i < a->num_filters; i++)
1115 if (s->fns && task_status(s->fns[i].task) >= 0)
1117 if (a->num_writers > 0) {
1118 for (i = 0; i < a->num_writers; i++)
1119 if (s->wns && task_status(s->wns[i].task) >= 0)
1122 if (s->wns && task_status(s->wns[0].task) >= 0)
1128 static void close_slot(int slot_num)
1130 struct slot_info *s = slot + slot_num;
1132 PARA_INFO_LOG("closing slot %d\n", slot_num);
1135 close_receiver(slot_num);
1136 clear_slot(slot_num);
1139 static void close_unused_slots(void)
1144 if (must_close_slot(i))
1149 * Close the connection to para_server and exit.
1151 * \param status The exit status which is passed to exit(3).
1152 * \param msg The log message
1154 * Log \a msg with loglevel \p EMERG, close the connection to para_server and
1155 * all slots, and call \p exit(status). \a status should be either EXIT_SUCCESS
1160 void __noreturn clean_exit(int status, const char *msg)
1163 unlink(socket_name);
1165 close_unused_slots();
1166 audiod_cmdline_parser_free(&conf);
1167 close_stat_clients();
1168 PARA_EMERG_LOG("%s\n", msg);
1173 * Check if any receivers/filters/writers need to be started and do so if
1176 static void start_stop_decoders(void)
1179 struct slot_info *sl;
1181 close_unused_slots();
1182 if (audiod_status != AUDIOD_ON ||
1183 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1184 return notify_receivers(E_NOT_PLAYING);
1185 if (!must_start_decoder())
1187 ret = open_receiver(stat_task->current_audio_format_num);
1189 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1195 activate_grab_clients(&sched);
1196 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1199 static void status_pre_select(struct sched *s, struct task *t)
1201 struct status_task *st = task_context(t);
1202 int i, ret, cafn = stat_task->current_audio_format_num;
1204 if (must_start_decoder())
1207 if (must_close_slot(i))
1209 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1212 if (st->ct && audiod_status == AUDIOD_OFF)
1214 if (!st->ct && audiod_status != AUDIOD_OFF)
1215 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1217 sched_request_barrier(&afi[cafn].restart_barrier, s);
1219 * If para_server is playing we'd like to have a smooth time display
1220 * even if we are running in standby mode. So we request a timeout that
1221 * expires at the next full second.
1223 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1224 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1230 /* restart the client task if necessary */
1231 static int status_post_select(struct sched *s, struct task *t)
1233 struct status_task *st = task_context(t);
1235 if (audiod_status == AUDIOD_OFF) {
1238 if (task_status(st->ct->task) >= 0) {
1239 task_notify(st->ct->task, E_AUDIOD_OFF);
1243 st->clock_diff_count = conf.clock_diff_count_arg;
1251 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1256 if (st->ct->status != CL_EXECUTING)
1259 struct timeval diff;
1260 tv_diff(now, &st->last_status_read, &diff);
1261 if (diff.tv_sec > 61)
1262 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1265 btr_merge(st->btrn, st->min_iqs);
1266 sz = btr_next_buffer(st->btrn, &buf);
1267 ret = for_each_stat_item(buf, sz, update_item);
1269 task_notify(st->ct->task, -ret);
1273 btr_consume(st->btrn, sz - ret);
1274 st->last_status_read = *now;
1276 } else /* current status item crosses buffers */
1277 st->min_iqs = sz + 1;
1280 btr_drain(st->btrn);
1281 st->current_audio_format_num = -1;
1282 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1284 if (st->clock_diff_count) { /* get status only one time */
1285 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1287 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1288 st->clock_diff_count--;
1289 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1290 set_stat_task_restart_barrier(2);
1293 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1295 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1296 set_stat_task_restart_barrier(5);
1298 free(stat_item_values[SI_BASENAME]);
1299 stat_item_values[SI_BASENAME] = para_strdup(
1300 "no connection to para_server");
1301 stat_client_write_item(SI_BASENAME);
1302 st->last_status_read = *now;
1304 start_stop_decoders();
1308 static void init_status_task(struct status_task *st)
1310 memset(st, 0, sizeof(struct status_task));
1311 st->sa_time_diff_sign = 1;
1312 st->clock_diff_count = conf.clock_diff_count_arg;
1313 st->current_audio_format_num = -1;
1314 st->btrn = btr_new_node(&(struct btr_node_description)
1315 EMBRACE(.name = "stat"));
1317 stat_task->task = task_register(&(struct task_info) {
1319 .pre_select = status_pre_select,
1320 .post_select = status_post_select,
1321 .context = stat_task,
1325 static void set_initial_status(void)
1327 audiod_status = AUDIOD_ON;
1328 if (!conf.mode_given)
1330 if (!strcmp(conf.mode_arg, "sb")) {
1331 audiod_status = AUDIOD_STANDBY;
1334 if (!strcmp(conf.mode_arg, "off")) {
1335 audiod_status = AUDIOD_OFF;
1338 if (strcmp(conf.mode_arg, "on"))
1339 PARA_WARNING_LOG("invalid mode\n");
1342 __noreturn static void print_help_and_die(void)
1344 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1345 bool d = conf.detailed_help_given;
1348 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1349 ggo_print_help(&h, flags);
1351 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1352 print_receiver_helps(flags);
1353 print_filter_helps(flags);
1354 print_writer_helps(flags);
1358 static void init_colors_or_die(void)
1364 daemon_set_default_log_colors();
1365 daemon_set_flag(DF_COLOR_LOG);
1366 for (i = 0; i < conf.log_color_given; i++)
1367 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1371 * the main function of para_audiod
1373 * \param argc usual argument count
1374 * \param argv usual argument vector
1376 * \return EXIT_SUCCESS or EXIT_FAILURE
1378 * \sa para_audiod(1)
1380 int main(int argc, char *argv[])
1383 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1384 struct audiod_cmdline_parser_params params = {
1387 .check_required = 0,
1388 .check_ambiguity = 0,
1393 audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms);
1394 daemon_set_loglevel(conf.loglevel_arg);
1395 version_handle_flag("audiod", conf.version_given);
1396 /* init receivers/filters/writers early to make help work */
1400 if (conf.help_given || conf.detailed_help_given)
1401 print_help_and_die();
1402 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1403 parse_config_or_die();
1404 init_colors_or_die();
1405 init_random_seed_or_die();
1406 daemon_set_flag(DF_LOG_TIME);
1407 daemon_set_flag(DF_LOG_HOSTNAME);
1408 daemon_set_flag(DF_LOG_LL);
1409 if (conf.log_timing_given)
1410 daemon_set_flag(DF_LOG_TIMING);
1411 if (conf.logfile_given) {
1412 daemon_set_logfile(conf.logfile_arg);
1413 daemon_open_log_or_die();
1415 ret = parse_stream_args();
1417 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1420 log_welcome("para_audiod");
1421 set_server_start_time(NULL);
1422 set_initial_status();
1425 setup_signal_handling();
1427 init_status_task(stat_task);
1428 init_command_task(cmd_task);
1430 if (conf.daemon_given)
1431 daemonize(false /* parent exits immediately */);
1433 sig_task->task = task_register(&(struct task_info) {
1435 .pre_select = signal_pre_select,
1436 .post_select = signal_post_select,
1437 .context = sig_task,
1440 sched.default_timeout.tv_sec = 2;
1441 sched.default_timeout.tv_usec = 999 * 1000;
1442 ret = schedule(&sched);
1443 sched_shutdown(&sched);
1445 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1446 return EXIT_FAILURE;