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;
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 * We need two listening sockets for backward compability: on Linux systems
162 * fd[0] is an abstract socket (more precisely, a socket bound to an address in
163 * the abstract namespace), and fd[1] is the usual pathname socket. On other
164 * systems, fd[0] is negative, and only the pathname socket is used.
166 * For 0.5.x we accept connections on both sockets to make sure that old
167 * para_audioc versions can still connect. New versions use only the abstract
168 * socket. Hence after v0.6.0 we can go back to a single socket, either an
169 * abstract one (Linux) or a pathname socket (all other systems).
171 struct command_task {
172 /** The local listening sockets. */
174 /** the associated task structure */
178 /** iterate over all supported audio formats */
179 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
182 * Get the audio format number.
184 * \param name The name of the audio format.
186 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
187 * \a name is not a supported audio format.
189 static int get_audio_format_num(const char *name)
193 while (para_isspace(*name))
195 FOR_EACH_AUDIO_FORMAT(i)
196 if (!strcmp(name, audio_formats[i]))
198 return -E_UNSUPPORTED_AUDIO_FORMAT;
201 static int get_matching_audio_format_nums(const char *re)
206 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
210 FOR_EACH_AUDIO_FORMAT(i)
211 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
217 static int get_play_time_slot_num(void)
219 int i, oldest_slot = -1;
220 struct timeval oldest_wstime = {0, 0};
223 struct slot_info *s = &slot[i];
224 struct timeval wstime;
225 if (!s->wns || !s->wns[0].btrn)
227 btr_get_node_start(s->wns[0].btrn, &wstime);
228 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
230 oldest_wstime = wstime;
237 * Compute the play time based on information of the current slot.
239 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
240 * from the status items received from para_server and the start time of the
241 * (first) writer of the current slot.
243 * It has to take into account that the stream was probably not started at
244 * the beginning of the file, that the clock between the server and the client
245 * host may differ and that playback of the stream was delayed, e.g. because
246 * the prebuffer filter is used in the filter configuration.
248 * If no writer is active, for example because para_audiod runs in standby
249 * mode, an approximation based only on the status items is computed and the
250 * returned string is prefixed with "~".
252 * \return A string that must be freed by the caller.
254 char *get_time_string(void)
256 int ret, seconds = 0, length;
257 struct timeval *tmp, sum, sss, /* server stream start */
258 rstime, /* receiver start time */
259 wstime, /* writer start time */
260 wtime, /* now - writer start */
261 rskip; /* receiver start - sss */
262 int slot_num = get_play_time_slot_num();
263 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
266 if (audiod_status == AUDIOD_OFF)
268 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
269 if (stat_task->length_seconds) /* paused */
271 goto empty; /* stopped */
273 if (audiod_status == AUDIOD_ON && !s)
276 * Valid status items and playing, set length and tmp to the stream
277 * start. We use the slot info and fall back to the info from current
278 * status items if no slot info is available.
280 length = stat_task->length_seconds;
281 tmp = &stat_task->server_stream_start;
282 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
283 btr_get_node_start(s->wns[0].btrn, &wstime);
284 if (wstime.tv_sec != 0) { /* writer wrote something */
285 if (s->server_stream_start.tv_sec == 0) {
286 /* copy status info to slot */
287 s->server_stream_start = stat_task->server_stream_start;
288 s->offset_seconds = stat_task->offset_seconds;
289 s->seconds_total = stat_task->length_seconds;
291 length = s->seconds_total;
292 tmp = &s->server_stream_start;
295 if (stat_task->sa_time_diff_sign > 0)
296 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
298 tv_add(tmp, &stat_task->sa_time_diff, &sss);
299 if (!s || !s->wns || !s->wns[0].btrn) {
301 tv_diff(now, &sss, &diff);
302 seconds = diff.tv_sec + stat_task->offset_seconds;
305 tv_diff(now, &wstime, &wtime);
306 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
307 seconds = s->offset_seconds;
308 if (s->receiver_node->btrn) {
309 btr_get_node_start(s->receiver_node->btrn, &rstime);
310 ret = tv_diff(&rstime, &sss, &rskip);
311 if (ret > 0) { /* audiod was started in the middle of the stream */
312 tv_add(&wtime, &rskip, &sum);
313 seconds += sum.tv_sec;
315 seconds += wtime.tv_sec;
317 seconds += wtime.tv_sec;
319 seconds = PARA_MIN(seconds, length);
320 seconds = PARA_MAX(seconds, 0);
322 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
326 (length - seconds) / 60,
327 (length - seconds) % 60,
328 length? (seconds * 100 + length / 2) / length : 0,
332 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
335 return para_strdup(NULL);
338 static void parse_config_or_die(void)
342 struct audiod_cmdline_parser_params params = {
346 .check_ambiguity = 0,
350 if (conf.config_file_given)
351 config_file = para_strdup(conf.config_file_arg);
353 char *home = para_homedir();
354 config_file = make_message("%s/.paraslash/audiod.conf", home);
357 ret = file_exists(config_file);
358 if (conf.config_file_given && !ret) {
359 PARA_EMERG_LOG("can not read config file %s\n", config_file);
363 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
364 daemon_set_loglevel(conf.loglevel_arg);
373 static void setup_signal_handling(void)
375 signal_task = signal_init_or_die();
376 para_install_sighandler(SIGINT);
377 para_install_sighandler(SIGTERM);
378 para_install_sighandler(SIGHUP);
379 para_sigaction(SIGPIPE, SIG_IGN);
382 static void clear_slot(int slot_num)
384 struct slot_info *s = &slot[slot_num];
386 PARA_INFO_LOG("clearing slot %d\n", slot_num);
387 memset(s, 0, sizeof(struct slot_info));
391 static void close_receiver(int slot_num)
393 struct slot_info *s = &slot[slot_num];
394 struct audio_format_info *a;
396 if (s->format < 0 || !s->receiver_node)
399 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
400 audio_formats[s->format], slot_num);
401 a->receiver->close(s->receiver_node);
402 btr_remove_node(&s->receiver_node->btrn);
403 task_reap(&s->receiver_node->task);
404 free(s->receiver_node);
405 s->receiver_node = NULL;
406 stat_task->current_audio_format_num = -1;
407 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
408 &a->restart_barrier);
411 static void writer_cleanup(struct writer_node *wn)
417 w = writers + wn->writer_num;
418 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
420 btr_remove_node(&wn->btrn);
421 task_reap(&wn->task);
424 static void close_writers(struct slot_info *s)
426 struct audio_format_info *a;
433 if (a->num_writers == 0)
434 writer_cleanup(s->wns);
436 for (i = 0; i < a->num_writers; i++)
437 writer_cleanup(s->wns + i);
443 static void close_filters(struct slot_info *s)
446 struct audio_format_info *a = afi + s->format;
447 if (a->num_filters == 0)
449 for (i = a->num_filters - 1; i >= 0; i--) {
450 struct filter_node *fn = s->fns + i;
455 f = filters + fn->filter_num;
458 btr_remove_node(&fn->btrn);
459 task_reap(&fn->task);
465 static void notify_receivers(int error)
470 struct slot_info *s = slot + i;
473 if (!s->receiver_node)
475 task_notify(s->receiver_node->task, error);
479 static int get_empty_slot(void)
490 if (s->wns || s->receiver_node || s->fns)
495 return -E_NO_MORE_SLOTS;
498 static void open_filters(struct slot_info *s)
500 struct audio_format_info *a = afi + s->format;
501 struct filter_node *fn;
502 int nf = a->num_filters;
503 struct btr_node *parent;
508 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
509 assert(s->fns == NULL);
510 s->fns = para_calloc(nf * sizeof(struct filter_node));
511 parent = s->receiver_node->btrn;
512 for (i = 0; i < nf; i++) {
514 struct filter *f = filters + a->filter_nums[i];
516 fn->filter_num = a->filter_nums[i];
517 fn->conf = a->filter_conf[i];
518 fn->btrn = btr_new_node(&(struct btr_node_description)
519 EMBRACE(.name = f->name, .parent = parent,
520 .handler = f->execute, .context = fn));
523 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
524 fn->task = task_register(&(struct task_info) {
526 .pre_select = f->pre_select,
527 .post_select = f->post_select,
531 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
532 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
536 static void open_writers(struct slot_info *s)
539 struct audio_format_info *a = afi + s->format;
540 struct writer_node *wn;
541 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
543 assert(s->wns == NULL);
544 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
545 * sizeof(struct writer_node));
546 for (i = 0; i < a->num_writers; i++) {
548 wn->conf = a->writer_conf[i];
549 wn->writer_num = a->writer_nums[i];
550 register_writer_node(wn, parent, &sched);
551 PARA_NOTICE_LOG("%s writer started in slot %d\n",
552 writer_names[a->writer_nums[i]], (int)(s - slot));
556 /* returns slot num on success */
557 static int open_receiver(int format)
559 struct audio_format_info *a = &afi[format];
562 struct receiver *r = a->receiver;
563 struct receiver_node *rn;
565 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
566 ret = get_empty_slot();
570 rn = para_calloc(sizeof(*rn));
572 rn->conf = a->receiver_conf;
573 rn->btrn = btr_new_node(&(struct btr_node_description)
574 EMBRACE(.name = r->name, .context = rn));
577 btr_remove_node(&rn->btrn);
583 s->receiver_node = rn;
584 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
585 audio_formats[format], r->name, slot_num);
586 rn->task = task_register(&(struct task_info) {
588 .pre_select = r->pre_select,
589 .post_select = r->post_select,
595 static bool receiver_running(void)
598 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
601 struct slot_info *s = &slot[i];
602 long unsigned ss2 = s->server_stream_start.tv_sec;
604 if (!s->receiver_node)
606 if (task_status(s->receiver_node->task) >= 0)
615 * Return the root node of the current buffer tree.
617 * This is only used for stream grabbing.
619 * \return \p NULL if no slot is currently active. If more than one buffer tree
620 * exists, the node corresponding to the most recently started receiver is
623 struct btr_node *audiod_get_btr_root(void)
625 int i, newest_slot = -1;
626 struct timeval newest_rstime = {0, 0};
629 struct slot_info *s = &slot[i];
630 struct timeval rstime;
631 if (!s->receiver_node)
633 if (task_status(s->receiver_node->task) < 0)
635 btr_get_node_start(s->receiver_node->btrn, &rstime);
636 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
638 newest_rstime = rstime;
641 if (newest_slot == -1)
643 return slot[newest_slot].receiver_node->btrn;
646 /* whether a new instance of a decoder should be started. */
647 static bool must_start_decoder(void)
649 int cafn = stat_task->current_audio_format_num;
650 unsigned vs = stat_task->vss_status;
652 if (audiod_status != AUDIOD_ON)
658 if (vs & VSS_STATUS_FLAG_NEXT)
660 if (!(vs & VSS_STATUS_FLAG_PLAYING))
662 if (receiver_running())
664 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
669 static void compute_time_diff(const struct timeval *status_time)
671 struct timeval tmp, diff;
672 static unsigned count;
673 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
674 const struct timeval max_deviation = {0, 500 * 1000};
675 const int time_smooth = 5;
677 sign = tv_diff(status_time, now, &diff);
678 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
679 // sign, sa_time_diff_sign);
681 sa_time_diff_sign = sign;
682 stat_task->sa_time_diff = diff;
687 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
688 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
689 PARA_WARNING_LOG("time diff jump: %lims\n",
693 sa_time_diff_sign = tv_convex_combination(
694 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
695 count > 10? sign : sign * time_smooth, &diff,
697 stat_task->sa_time_diff = tmp;
698 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
701 sa_time_diff_sign < 0? "-" : "+",
702 tv2ms(&stat_task->sa_time_diff)
705 stat_task->sa_time_diff_sign = sa_time_diff_sign;
708 static int update_item(int itemnum, char *buf)
710 long unsigned sec, usec;
712 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
714 free(stat_item_values[itemnum]);
715 stat_item_values[itemnum] = para_strdup(buf);
716 stat_client_write_item(itemnum);
718 case SI_STATUS_FLAGS:
719 stat_task->vss_status = 0;
720 if (strchr(buf, 'N'))
721 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
722 if (strchr(buf, 'P'))
723 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
726 stat_task->offset_seconds = atoi(buf);
728 case SI_SECONDS_TOTAL:
729 stat_task->length_seconds = atoi(buf);
731 case SI_STREAM_START:
732 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
733 stat_task->server_stream_start.tv_sec = sec;
734 stat_task->server_stream_start.tv_usec = usec;
737 case SI_CURRENT_TIME:
738 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
739 struct timeval tv = {sec, usec};
740 compute_time_diff(&tv);
744 stat_task->current_audio_format_num
745 = get_audio_format_num(buf);
750 static int parse_stream_command(const char *txt, char **cmd)
753 char *re, *p = strchr(txt, ':');
756 return -E_MISSING_COLON;
759 re = malloc(len + 1);
760 strncpy(re, txt, len);
762 ret = get_matching_audio_format_nums(re);
767 static int add_filter(int format, char *cmdline)
769 struct audio_format_info *a = &afi[format];
770 int filter_num, nf = a->num_filters;
773 filter_num = check_filter_arg(cmdline, &cfg);
776 a->filter_conf = para_realloc(a->filter_conf,
777 (nf + 1) * sizeof(void *));
778 a->filter_nums = para_realloc(a->filter_nums,
779 (nf + 1) * sizeof(unsigned));
780 a->filter_nums[nf] = filter_num;
781 a->filter_conf[nf] = cfg;
783 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
784 filters[filter_num].name);
788 static int parse_writer_args(void)
792 struct audio_format_info *a;
794 for (i = 0; i < conf.writer_given; i++) {
796 int j, nw, writer_num, af_mask;
798 ret = parse_stream_command(conf.writer_arg[i], &cmd);
802 FOR_EACH_AUDIO_FORMAT(j) {
804 if ((af_mask & (1 << j)) == 0) /* no match */
806 wconf = check_writer_arg_or_die(cmd, &writer_num);
808 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
809 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
810 a->writer_nums[nw] = writer_num;
811 a->writer_conf[nw] = wconf;
812 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
813 nw, writer_names[writer_num]);
817 /* Use default writer for audio formats which are not yet set up. */
818 FOR_EACH_AUDIO_FORMAT(i) {
822 if (a->num_writers > 0)
823 continue; /* already set up */
824 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
825 a->writer_nums = para_malloc(sizeof(int));
826 a->writer_nums[0] = writer_num;
827 a->writer_conf = para_malloc(sizeof(void *));
828 a->writer_conf[0] = writer_conf;
830 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
831 writer_names[writer_num]);
836 static int parse_receiver_args(void)
838 int i, ret, receiver_num;
840 struct audio_format_info *a;
842 for (i = conf.receiver_given - 1; i >= 0; i--) {
846 ret = parse_stream_command(conf.receiver_arg[i], &arg);
850 FOR_EACH_AUDIO_FORMAT(j) {
852 if ((af_mask & (1 << j)) == 0) /* no match */
855 * If multiple receivers are given for this audio format, the
856 * last one wins and we have to free the previous receiver
857 * config here. Since we are iterating backwards, the winning
858 * receiver arg is in fact the first one given.
860 if (a->receiver_conf)
861 a->receiver->free_config(a->receiver_conf);
862 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
863 ret = -E_RECV_SYNTAX;
864 if (!a->receiver_conf)
866 a->receiver = receivers + receiver_num;
870 * Use the first available receiver with no arguments for those audio
871 * formats for which no receiver was specified.
873 cmd = para_strdup(receivers[0].name);
874 FOR_EACH_AUDIO_FORMAT(i) {
876 if (a->receiver_conf)
878 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
879 if (!a->receiver_conf)
880 return -E_RECV_SYNTAX;
881 a->receiver = &receivers[receiver_num];
883 FOR_EACH_AUDIO_FORMAT(i) {
885 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
886 audio_formats[i], a->receiver->name);
894 static int init_default_filters(void)
898 FOR_EACH_AUDIO_FORMAT(i) {
899 struct audio_format_info *a = &afi[i];
904 continue; /* no default -- nothing to to */
906 * udp and dccp streams are fec-encoded, so add fecdec as the
909 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
910 strcmp(afi[i].receiver->name, "dccp") == 0) {
911 tmp = para_strdup("fecdec");
917 /* add "dec" to audio format name */
918 tmp = make_message("%sdec", audio_formats[i]);
919 for (j = 0; filters[j].name; j++)
920 if (!strcmp(tmp, filters[j].name))
923 ret = -E_UNSUPPORTED_FILTER;
924 if (!filters[j].name)
926 tmp = para_strdup(filters[j].name);
927 ret = add_filter(i, tmp);
931 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
938 static int parse_filter_args(void)
940 int i, j, ret, af_mask, num_matches;
942 for (i = 0; i < conf.filter_given; i++) {
944 ret = parse_stream_command(conf.filter_arg[i], &arg);
949 FOR_EACH_AUDIO_FORMAT(j) {
950 if ((af_mask & (1 << j)) == 0) /* no match */
952 ret = add_filter(j, arg);
957 if (num_matches == 0)
958 PARA_WARNING_LOG("ignoring filter spec: %s\n",
961 ret = init_default_filters(); /* use default values for the rest */
966 static int parse_stream_args(void)
970 ret = parse_receiver_args();
973 ret = parse_filter_args();
976 ret = parse_writer_args();
982 /* does not unlink socket on errors */
983 static void init_local_sockets(struct command_task *ct)
985 if (conf.socket_given)
986 socket_name = para_strdup(conf.socket_arg);
988 char *hn = para_hostname();
989 socket_name = make_message("/var/paraslash/audiod_socket.%s",
993 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
994 if (conf.force_given)
996 ct->fd[0] = create_local_socket(socket_name, 0);
997 ct->fd[1] = create_local_socket(socket_name,
998 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
999 if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1001 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1005 static int signal_post_select(struct sched *s, void *context)
1007 struct signal_task *st = context;
1010 ret = task_get_notification(st->task);
1013 signum = para_next_signal(&s->rfds);
1018 PARA_NOTICE_LOG("received signal %d\n", signum);
1019 task_notify_all(s, E_AUDIOD_SIGNAL);
1020 return -E_AUDIOD_SIGNAL;
1025 static void command_pre_select(struct sched *s, void *context)
1027 struct command_task *ct = context;
1030 for (i = 0; i < 2; i++)
1032 para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1035 static int command_post_select(struct sched *s, void *context)
1038 struct command_task *ct = context;
1039 static struct timeval last_status_dump;
1040 struct timeval tmp, delay;
1043 ret = task_get_notification(ct->task);
1046 for (i = 0; i < 2; i++) {
1049 ret = handle_connect(ct->fd[i], &s->rfds);
1051 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1052 if (ret == -E_AUDIOD_TERM) {
1053 task_notify_all(s, -ret);
1062 /* if last status dump was less than 500ms ago, do nothing */
1064 delay.tv_usec = 500 * 1000;
1065 tv_add(&last_status_dump, &delay, &tmp);
1066 if (tv_diff(now, &tmp, NULL) < 0)
1070 * If last status dump was more than 5s ago, force update. Otherwise,
1071 * update only those items that have changed.
1075 tv_add(&last_status_dump, &delay, &tmp);
1076 if (tv_diff(now, &tmp, NULL) > 0)
1079 audiod_status_dump(force);
1080 last_status_dump = *now;
1084 static void init_command_task(struct command_task *ct)
1086 init_local_sockets(ct); /* doesn't return on errors */
1088 ct->task = task_register(&(struct task_info) {
1090 .pre_select = command_pre_select,
1091 .post_select = command_post_select,
1096 static void close_stat_pipe(void)
1100 task_reap(&stat_task->ct->task);
1101 client_close(stat_task->ct);
1102 stat_task->ct = NULL;
1103 clear_and_dump_items();
1104 stat_task->length_seconds = 0;
1105 stat_task->offset_seconds = 0;
1106 stat_task->vss_status = 0;
1107 stat_task->current_audio_format_num = -1;
1108 audiod_status_dump(true);
1111 /* avoid busy loop if server is down */
1112 static void set_stat_task_restart_barrier(unsigned seconds)
1114 struct timeval delay = {seconds, 0};
1115 tv_add(now, &delay, &stat_task->restart_barrier);
1118 static bool must_close_slot(int slot_num)
1120 struct slot_info *s = &slot[slot_num];
1121 struct audio_format_info *a = afi + s->format;
1126 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1128 for (i = 0; i < a->num_filters; i++)
1129 if (s->fns && task_status(s->fns[i].task) >= 0)
1131 if (a->num_writers > 0) {
1132 for (i = 0; i < a->num_writers; i++)
1133 if (s->wns && task_status(s->wns[i].task) >= 0)
1136 if (s->wns && task_status(s->wns[0].task) >= 0)
1142 static void close_slot(int slot_num)
1144 struct slot_info *s = slot + slot_num;
1146 PARA_INFO_LOG("closing slot %d\n", slot_num);
1149 close_receiver(slot_num);
1150 clear_slot(slot_num);
1153 static void close_unused_slots(void)
1158 if (must_close_slot(i))
1163 * Cleanup all resources.
1165 * This performs various cleanups, removes the audiod socket and closes the
1166 * connection to para_server.
1168 static void audiod_cleanup(void)
1171 unlink(socket_name);
1173 close_unused_slots();
1174 audiod_cmdline_parser_free(&conf);
1175 close_stat_clients();
1179 * Check if any receivers/filters/writers need to be started and do so if
1182 static void start_stop_decoders(void)
1185 struct slot_info *sl;
1187 close_unused_slots();
1188 if (audiod_status != AUDIOD_ON ||
1189 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1190 return notify_receivers(E_NOT_PLAYING);
1191 if (!must_start_decoder())
1193 ret = open_receiver(stat_task->current_audio_format_num);
1195 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1201 activate_grab_clients(&sched);
1202 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1205 static void status_pre_select(struct sched *s, void *context)
1207 struct status_task *st = context;
1208 int i, ret, cafn = stat_task->current_audio_format_num;
1210 if (must_start_decoder())
1213 if (must_close_slot(i))
1215 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1218 if (st->ct && audiod_status == AUDIOD_OFF)
1220 if (!st->ct && audiod_status != AUDIOD_OFF)
1221 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1223 sched_request_barrier(&afi[cafn].restart_barrier, s);
1225 * If para_server is playing we'd like to have a smooth time display
1226 * even if we are running in standby mode. So we request a timeout that
1227 * expires at the next full second.
1229 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1230 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1236 /* restart the client task if necessary */
1237 static int status_post_select(struct sched *s, void *context)
1239 struct status_task *st = context;
1242 ret = task_get_notification(st->task);
1245 if (audiod_status == AUDIOD_OFF) {
1248 if (task_status(st->ct->task) >= 0) {
1249 task_notify(st->ct->task, E_AUDIOD_OFF);
1253 st->clock_diff_count = conf.clock_diff_count_arg;
1260 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1265 if (st->ct->status != CL_EXECUTING)
1268 struct timeval diff;
1269 tv_diff(now, &st->last_status_read, &diff);
1270 if (diff.tv_sec > 61)
1271 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1274 btr_merge(st->btrn, st->min_iqs);
1275 sz = btr_next_buffer(st->btrn, &buf);
1276 ret = for_each_stat_item(buf, sz, update_item);
1278 task_notify(st->ct->task, -ret);
1282 btr_consume(st->btrn, sz - ret);
1283 st->last_status_read = *now;
1285 } else /* current status item crosses buffers */
1286 st->min_iqs = sz + 1;
1289 btr_drain(st->btrn);
1290 st->current_audio_format_num = -1;
1291 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1293 if (st->clock_diff_count) { /* get status only one time */
1294 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1296 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1297 st->clock_diff_count--;
1298 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1299 set_stat_task_restart_barrier(2);
1302 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1304 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1305 set_stat_task_restart_barrier(5);
1307 free(stat_item_values[SI_BASENAME]);
1308 stat_item_values[SI_BASENAME] = para_strdup(
1309 "no connection to para_server");
1310 stat_client_write_item(SI_BASENAME);
1311 st->last_status_read = *now;
1313 start_stop_decoders();
1317 static void init_status_task(struct status_task *st)
1319 memset(st, 0, sizeof(struct status_task));
1320 st->sa_time_diff_sign = 1;
1321 st->clock_diff_count = conf.clock_diff_count_arg;
1322 st->current_audio_format_num = -1;
1323 st->btrn = btr_new_node(&(struct btr_node_description)
1324 EMBRACE(.name = "stat"));
1326 stat_task->task = task_register(&(struct task_info) {
1328 .pre_select = status_pre_select,
1329 .post_select = status_post_select,
1330 .context = stat_task,
1334 static void set_initial_status(void)
1336 audiod_status = AUDIOD_ON;
1337 if (!conf.mode_given)
1339 if (!strcmp(conf.mode_arg, "sb")) {
1340 audiod_status = AUDIOD_STANDBY;
1343 if (!strcmp(conf.mode_arg, "off")) {
1344 audiod_status = AUDIOD_OFF;
1347 if (strcmp(conf.mode_arg, "on"))
1348 PARA_WARNING_LOG("invalid mode\n");
1351 __noreturn static void print_help_and_die(void)
1353 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1354 bool d = conf.detailed_help_given;
1357 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1358 ggo_print_help(&h, flags);
1360 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1361 print_receiver_helps(flags);
1362 print_filter_helps(flags);
1363 print_writer_helps(flags);
1368 * the main function of para_audiod
1370 * \param argc usual argument count
1371 * \param argv usual argument vector
1373 * \return EXIT_SUCCESS or EXIT_FAILURE
1375 * \sa para_audiod(1)
1377 int main(int argc, char *argv[])
1380 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1381 struct audiod_cmdline_parser_params params = {
1384 .check_required = 0,
1385 .check_ambiguity = 0,
1390 audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms);
1391 daemon_set_loglevel(conf.loglevel_arg);
1392 version_handle_flag("audiod", conf.version_given);
1393 /* init receivers/filters/writers early to make help work */
1397 if (conf.help_given || conf.detailed_help_given)
1398 print_help_and_die();
1399 daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1400 parse_config_or_die();
1401 daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1402 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1403 init_random_seed_or_die();
1404 daemon_set_flag(DF_LOG_TIME);
1405 daemon_set_flag(DF_LOG_HOSTNAME);
1406 daemon_set_flag(DF_LOG_LL);
1407 if (conf.log_timing_given)
1408 daemon_set_flag(DF_LOG_TIMING);
1409 if (conf.logfile_given) {
1410 daemon_set_logfile(conf.logfile_arg);
1411 daemon_open_log_or_die();
1413 ret = parse_stream_args();
1415 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1418 daemon_log_welcome("para_audiod");
1419 daemon_set_start_time();
1420 set_initial_status();
1423 setup_signal_handling();
1425 init_status_task(stat_task);
1426 init_command_task(cmd_task);
1428 if (conf.daemon_given)
1429 daemonize(false /* parent exits immediately */);
1431 signal_task->task = task_register(&(struct task_info) {
1433 .pre_select = signal_pre_select,
1434 .post_select = signal_post_select,
1435 .context = signal_task,
1438 sched.default_timeout.tv_sec = 2;
1439 sched.default_timeout.tv_usec = 999 * 1000;
1440 ret = schedule(&sched);
1442 sched_shutdown(&sched);
1443 signal_shutdown(signal_task);
1446 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1447 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;