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)
218 * Compute the play time based on information of the given slot.
220 * \param slot_num The slot number (negative means: no slot).
222 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
223 * from the status items received from para_server and the start time of the
224 * (first) writer of the given slot.
226 * It has to take into account that the stream was probably not started at
227 * the beginning of the file, that the clock between the server and the client
228 * host may differ and that playback of the stream was delayed, e.g. because
229 * the prebuffer filter is used in the filter configuration of the given slot.
231 * If no writer is active in the given slot, or \a slot_num is negative
232 * (indicating that para_audiod runs in standby mode), an approximation based
233 * only on the status items is computed and the returned string is prefixed
236 * \return A string that must be freed by the caller.
238 char *get_time_string(int slot_num)
240 int ret, seconds = 0, length;
241 struct timeval *tmp, sum, sss, /* server stream start */
242 rstime, /* receiver start time */
243 wstime, /* writer start time */
244 wtime, /* now - writer start */
245 rskip; /* receiver start - sss */
246 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
249 if (audiod_status == AUDIOD_OFF)
251 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
252 if (stat_task->length_seconds) /* paused */
254 goto empty; /* stopped */
256 if (audiod_status == AUDIOD_ON && !s)
259 * Valid status items and playing, set length and tmp to the stream
260 * start. We use the slot info and fall back to the info from current
261 * status items if no slot info is available.
263 length = stat_task->length_seconds;
264 tmp = &stat_task->server_stream_start;
265 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
266 btr_get_node_start(s->wns[0].btrn, &wstime);
267 if (wstime.tv_sec != 0) { /* writer wrote something */
268 if (s->server_stream_start.tv_sec == 0) {
269 /* copy status info to slot */
270 s->server_stream_start = stat_task->server_stream_start;
271 s->offset_seconds = stat_task->offset_seconds;
272 s->seconds_total = stat_task->length_seconds;
274 length = s->seconds_total;
275 tmp = &s->server_stream_start;
278 if (stat_task->sa_time_diff_sign > 0)
279 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
281 tv_add(tmp, &stat_task->sa_time_diff, &sss);
282 if (!s || !s->wns || !s->wns[0].btrn) {
284 tv_diff(now, &sss, &diff);
285 seconds = diff.tv_sec + stat_task->offset_seconds;
288 tv_diff(now, &wstime, &wtime);
289 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
290 seconds = s->offset_seconds;
291 if (s->receiver_node->btrn) {
292 btr_get_node_start(s->receiver_node->btrn, &rstime);
293 ret = tv_diff(&rstime, &sss, &rskip);
294 if (ret > 0) { /* audiod was started in the middle of the stream */
295 tv_add(&wtime, &rskip, &sum);
296 seconds += sum.tv_sec;
298 seconds += wtime.tv_sec;
300 seconds += wtime.tv_sec;
302 seconds = PARA_MIN(seconds, length);
303 seconds = PARA_MAX(seconds, 0);
305 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
309 (length - seconds) / 60,
310 (length - seconds) % 60,
311 length? (seconds * 100 + length / 2) / length : 0,
315 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
318 return para_strdup(NULL);
321 static void parse_config_or_die(void)
325 struct audiod_cmdline_parser_params params = {
329 .check_ambiguity = 0,
333 if (conf.config_file_given)
334 config_file = para_strdup(conf.config_file_arg);
336 char *home = para_homedir();
337 config_file = make_message("%s/.paraslash/audiod.conf", home);
340 ret = file_exists(config_file);
341 if (conf.config_file_given && !ret) {
342 PARA_EMERG_LOG("can not read config file %s\n", config_file);
346 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
347 daemon_set_loglevel(conf.loglevel_arg);
356 static void setup_signal_handling(void)
358 signal_task = signal_init_or_die();
359 para_install_sighandler(SIGINT);
360 para_install_sighandler(SIGTERM);
361 para_install_sighandler(SIGHUP);
362 para_sigaction(SIGPIPE, SIG_IGN);
365 static void clear_slot(int slot_num)
367 struct slot_info *s = &slot[slot_num];
369 PARA_INFO_LOG("clearing slot %d\n", slot_num);
370 memset(s, 0, sizeof(struct slot_info));
374 static void close_receiver(int slot_num)
376 struct slot_info *s = &slot[slot_num];
377 struct audio_format_info *a;
379 if (s->format < 0 || !s->receiver_node)
382 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
383 audio_formats[s->format], slot_num);
384 a->receiver->close(s->receiver_node);
385 btr_remove_node(&s->receiver_node->btrn);
386 task_reap(&s->receiver_node->task);
387 free(s->receiver_node);
388 s->receiver_node = NULL;
389 stat_task->current_audio_format_num = -1;
390 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
391 &a->restart_barrier);
394 static void writer_cleanup(struct writer_node *wn)
400 w = writers + wn->writer_num;
401 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
403 btr_remove_node(&wn->btrn);
404 task_reap(&wn->task);
407 static void close_writers(struct slot_info *s)
409 struct audio_format_info *a;
416 if (a->num_writers == 0)
417 writer_cleanup(s->wns);
419 for (i = 0; i < a->num_writers; i++)
420 writer_cleanup(s->wns + i);
426 static void close_filters(struct slot_info *s)
429 struct audio_format_info *a = afi + s->format;
430 if (a->num_filters == 0)
432 for (i = a->num_filters - 1; i >= 0; i--) {
433 struct filter_node *fn = s->fns + i;
438 f = filters + fn->filter_num;
441 btr_remove_node(&fn->btrn);
442 task_reap(&fn->task);
448 static void notify_receivers(int error)
453 struct slot_info *s = slot + i;
456 if (!s->receiver_node)
458 task_notify(s->receiver_node->task, error);
462 static int get_empty_slot(void)
473 if (s->wns || s->receiver_node || s->fns)
478 return -E_NO_MORE_SLOTS;
481 static void open_filters(struct slot_info *s)
483 struct audio_format_info *a = afi + s->format;
484 struct filter_node *fn;
485 int nf = a->num_filters;
486 struct btr_node *parent;
491 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
492 assert(s->fns == NULL);
493 s->fns = para_calloc(nf * sizeof(struct filter_node));
494 parent = s->receiver_node->btrn;
495 for (i = 0; i < nf; i++) {
497 struct filter *f = filters + a->filter_nums[i];
499 fn->filter_num = a->filter_nums[i];
500 fn->conf = a->filter_conf[i];
501 fn->btrn = btr_new_node(&(struct btr_node_description)
502 EMBRACE(.name = f->name, .parent = parent,
503 .handler = f->execute, .context = fn));
506 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
507 fn->task = task_register(&(struct task_info) {
509 .pre_select = f->pre_select,
510 .post_select = f->post_select,
514 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
515 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
519 static void open_writers(struct slot_info *s)
522 struct audio_format_info *a = afi + s->format;
523 struct writer_node *wn;
524 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
526 assert(s->wns == NULL);
527 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
528 * sizeof(struct writer_node));
529 for (i = 0; i < a->num_writers; i++) {
531 wn->conf = a->writer_conf[i];
532 wn->writer_num = a->writer_nums[i];
533 register_writer_node(wn, parent, &sched);
534 PARA_NOTICE_LOG("%s writer started in slot %d\n",
535 writer_names[a->writer_nums[i]], (int)(s - slot));
539 /* returns slot num on success */
540 static int open_receiver(int format)
542 struct audio_format_info *a = &afi[format];
545 struct receiver *r = a->receiver;
546 struct receiver_node *rn;
548 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
549 ret = get_empty_slot();
553 rn = para_calloc(sizeof(*rn));
555 rn->conf = a->receiver_conf;
556 rn->btrn = btr_new_node(&(struct btr_node_description)
557 EMBRACE(.name = r->name, .context = rn));
560 btr_remove_node(&rn->btrn);
566 s->receiver_node = rn;
567 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
568 audio_formats[format], r->name, slot_num);
569 rn->task = task_register(&(struct task_info) {
571 .pre_select = r->pre_select,
572 .post_select = r->post_select,
578 static bool receiver_running(void)
581 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
584 struct slot_info *s = &slot[i];
585 long unsigned ss2 = s->server_stream_start.tv_sec;
587 if (!s->receiver_node)
589 if (task_status(s->receiver_node->task) >= 0)
598 * Return the root node of the current buffer tree.
600 * This is only used for stream grabbing.
602 * \return \p NULL if no slot is currently active. If more than one buffer tree
603 * exists, the node corresponding to the most recently started receiver is
606 struct btr_node *audiod_get_btr_root(void)
608 int i, newest_slot = -1;
609 struct timeval newest_rstime = {0, 0};
612 struct slot_info *s = &slot[i];
613 struct timeval rstime;
614 if (!s->receiver_node)
616 if (task_status(s->receiver_node->task) < 0)
618 btr_get_node_start(s->receiver_node->btrn, &rstime);
619 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
621 newest_rstime = rstime;
624 if (newest_slot == -1)
626 return slot[newest_slot].receiver_node->btrn;
629 /* whether a new instance of a decoder should be started. */
630 static bool must_start_decoder(void)
632 int cafn = stat_task->current_audio_format_num;
633 unsigned vs = stat_task->vss_status;
635 if (audiod_status != AUDIOD_ON)
641 if (vs & VSS_STATUS_FLAG_NEXT)
643 if (!(vs & VSS_STATUS_FLAG_PLAYING))
645 if (receiver_running())
647 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
652 static void compute_time_diff(const struct timeval *status_time)
654 struct timeval tmp, diff;
655 static unsigned count;
656 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
657 const struct timeval max_deviation = {0, 500 * 1000};
658 const int time_smooth = 5;
660 sign = tv_diff(status_time, now, &diff);
661 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
662 // sign, sa_time_diff_sign);
664 sa_time_diff_sign = sign;
665 stat_task->sa_time_diff = diff;
670 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
671 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
672 PARA_WARNING_LOG("time diff jump: %lims\n",
676 sa_time_diff_sign = tv_convex_combination(
677 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
678 count > 10? sign : sign * time_smooth, &diff,
680 stat_task->sa_time_diff = tmp;
681 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
684 sa_time_diff_sign < 0? "-" : "+",
685 tv2ms(&stat_task->sa_time_diff)
688 stat_task->sa_time_diff_sign = sa_time_diff_sign;
691 static int update_item(int itemnum, char *buf)
693 long unsigned sec, usec;
695 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
697 free(stat_item_values[itemnum]);
698 stat_item_values[itemnum] = para_strdup(buf);
699 stat_client_write_item(itemnum);
701 case SI_STATUS_FLAGS:
702 stat_task->vss_status = 0;
703 if (strchr(buf, 'N'))
704 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
705 if (strchr(buf, 'P'))
706 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
709 stat_task->offset_seconds = atoi(buf);
711 case SI_SECONDS_TOTAL:
712 stat_task->length_seconds = atoi(buf);
714 case SI_STREAM_START:
715 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
716 stat_task->server_stream_start.tv_sec = sec;
717 stat_task->server_stream_start.tv_usec = usec;
720 case SI_CURRENT_TIME:
721 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
722 struct timeval tv = {sec, usec};
723 compute_time_diff(&tv);
727 stat_task->current_audio_format_num
728 = get_audio_format_num(buf);
733 static int parse_stream_command(const char *txt, char **cmd)
736 char *re, *p = strchr(txt, ':');
739 return -E_MISSING_COLON;
742 re = malloc(len + 1);
743 strncpy(re, txt, len);
745 ret = get_matching_audio_format_nums(re);
750 static int add_filter(int format, char *cmdline)
752 struct audio_format_info *a = &afi[format];
753 int filter_num, nf = a->num_filters;
756 filter_num = check_filter_arg(cmdline, &cfg);
759 a->filter_conf = para_realloc(a->filter_conf,
760 (nf + 1) * sizeof(void *));
761 a->filter_nums = para_realloc(a->filter_nums,
762 (nf + 1) * sizeof(unsigned));
763 a->filter_nums[nf] = filter_num;
764 a->filter_conf[nf] = cfg;
766 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
767 filters[filter_num].name);
771 static int parse_writer_args(void)
775 struct audio_format_info *a;
777 for (i = 0; i < conf.writer_given; i++) {
779 int j, nw, writer_num, af_mask;
781 ret = parse_stream_command(conf.writer_arg[i], &cmd);
785 FOR_EACH_AUDIO_FORMAT(j) {
787 if ((af_mask & (1 << j)) == 0) /* no match */
789 wconf = check_writer_arg_or_die(cmd, &writer_num);
791 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
792 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
793 a->writer_nums[nw] = writer_num;
794 a->writer_conf[nw] = wconf;
795 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
796 nw, writer_names[writer_num]);
800 /* Use default writer for audio formats which are not yet set up. */
801 FOR_EACH_AUDIO_FORMAT(i) {
805 if (a->num_writers > 0)
806 continue; /* already set up */
807 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
808 a->writer_nums = para_malloc(sizeof(int));
809 a->writer_nums[0] = writer_num;
810 a->writer_conf = para_malloc(sizeof(void *));
811 a->writer_conf[0] = writer_conf;
813 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
814 writer_names[writer_num]);
819 static int parse_receiver_args(void)
821 int i, ret, receiver_num;
823 struct audio_format_info *a;
825 for (i = conf.receiver_given - 1; i >= 0; i--) {
829 ret = parse_stream_command(conf.receiver_arg[i], &arg);
833 FOR_EACH_AUDIO_FORMAT(j) {
835 if ((af_mask & (1 << j)) == 0) /* no match */
838 * If multiple receivers are given for this audio format, the
839 * last one wins and we have to free the previous receiver
840 * config here. Since we are iterating backwards, the winning
841 * receiver arg is in fact the first one given.
843 if (a->receiver_conf)
844 a->receiver->free_config(a->receiver_conf);
845 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
846 ret = -E_RECV_SYNTAX;
847 if (!a->receiver_conf)
849 a->receiver = receivers + receiver_num;
853 * Use the first available receiver with no arguments for those audio
854 * formats for which no receiver was specified.
856 cmd = para_strdup(receivers[0].name);
857 FOR_EACH_AUDIO_FORMAT(i) {
859 if (a->receiver_conf)
861 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
862 if (!a->receiver_conf)
863 return -E_RECV_SYNTAX;
864 a->receiver = &receivers[receiver_num];
866 FOR_EACH_AUDIO_FORMAT(i) {
868 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
869 audio_formats[i], a->receiver->name);
877 static int init_default_filters(void)
881 FOR_EACH_AUDIO_FORMAT(i) {
882 struct audio_format_info *a = &afi[i];
887 continue; /* no default -- nothing to to */
889 * udp and dccp streams are fec-encoded, so add fecdec as the
892 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
893 strcmp(afi[i].receiver->name, "dccp") == 0) {
894 tmp = para_strdup("fecdec");
900 /* add "dec" to audio format name */
901 tmp = make_message("%sdec", audio_formats[i]);
902 for (j = 0; filters[j].name; j++)
903 if (!strcmp(tmp, filters[j].name))
906 ret = -E_UNSUPPORTED_FILTER;
907 if (!filters[j].name)
909 tmp = para_strdup(filters[j].name);
910 ret = add_filter(i, tmp);
914 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
921 static int parse_filter_args(void)
923 int i, j, ret, af_mask, num_matches;
925 for (i = 0; i < conf.filter_given; i++) {
927 ret = parse_stream_command(conf.filter_arg[i], &arg);
932 FOR_EACH_AUDIO_FORMAT(j) {
933 if ((af_mask & (1 << j)) == 0) /* no match */
935 ret = add_filter(j, arg);
940 if (num_matches == 0)
941 PARA_WARNING_LOG("ignoring filter spec: %s\n",
944 ret = init_default_filters(); /* use default values for the rest */
949 static int parse_stream_args(void)
953 ret = parse_receiver_args();
956 ret = parse_filter_args();
959 ret = parse_writer_args();
965 /* does not unlink socket on errors */
966 static void init_local_sockets(struct command_task *ct)
968 if (conf.socket_given)
969 socket_name = para_strdup(conf.socket_arg);
971 char *hn = para_hostname();
972 socket_name = make_message("/var/paraslash/audiod_socket.%s",
976 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
977 if (conf.force_given)
979 ct->fd[0] = create_local_socket(socket_name, 0);
980 ct->fd[1] = create_local_socket(socket_name,
981 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
982 if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
984 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
988 static int signal_post_select(struct sched *s, void *context)
990 struct signal_task *st = context;
993 ret = task_get_notification(st->task);
996 signum = para_next_signal(&s->rfds);
1001 PARA_NOTICE_LOG("received signal %d\n", signum);
1002 task_notify_all(s, E_AUDIOD_SIGNAL);
1003 return -E_AUDIOD_SIGNAL;
1008 static void command_pre_select(struct sched *s, void *context)
1010 struct command_task *ct = context;
1013 for (i = 0; i < 2; i++)
1015 para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1018 static int command_post_select(struct sched *s, void *context)
1021 struct command_task *ct = context;
1022 static struct timeval last_status_dump;
1023 struct timeval tmp, delay;
1026 ret = task_get_notification(ct->task);
1029 for (i = 0; i < 2; i++) {
1032 ret = handle_connect(ct->fd[i], &s->rfds);
1034 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1035 if (ret == -E_AUDIOD_TERM) {
1036 task_notify_all(s, -ret);
1045 /* if last status dump was less than 500ms ago, do nothing */
1047 delay.tv_usec = 500 * 1000;
1048 tv_add(&last_status_dump, &delay, &tmp);
1049 if (tv_diff(now, &tmp, NULL) < 0)
1053 * If last status dump was more than 5s ago, force update. Otherwise,
1054 * update only those items that have changed.
1058 tv_add(&last_status_dump, &delay, &tmp);
1059 if (tv_diff(now, &tmp, NULL) > 0)
1062 audiod_status_dump(force);
1063 last_status_dump = *now;
1067 static void init_command_task(struct command_task *ct)
1069 init_local_sockets(ct); /* doesn't return on errors */
1071 ct->task = task_register(&(struct task_info) {
1073 .pre_select = command_pre_select,
1074 .post_select = command_post_select,
1079 static void close_stat_pipe(void)
1083 task_reap(&stat_task->ct->task);
1084 client_close(stat_task->ct);
1085 stat_task->ct = NULL;
1086 clear_and_dump_items();
1087 stat_task->length_seconds = 0;
1088 stat_task->offset_seconds = 0;
1089 stat_task->vss_status = 0;
1090 stat_task->current_audio_format_num = -1;
1091 audiod_status_dump(true);
1094 /* avoid busy loop if server is down */
1095 static void set_stat_task_restart_barrier(unsigned seconds)
1097 struct timeval delay = {seconds, 0};
1098 tv_add(now, &delay, &stat_task->restart_barrier);
1101 static bool must_close_slot(int slot_num)
1103 struct slot_info *s = &slot[slot_num];
1104 struct audio_format_info *a = afi + s->format;
1109 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1111 for (i = 0; i < a->num_filters; i++)
1112 if (s->fns && task_status(s->fns[i].task) >= 0)
1114 if (a->num_writers > 0) {
1115 for (i = 0; i < a->num_writers; i++)
1116 if (s->wns && task_status(s->wns[i].task) >= 0)
1119 if (s->wns && task_status(s->wns[0].task) >= 0)
1125 static void close_slot(int slot_num)
1127 struct slot_info *s = slot + slot_num;
1129 PARA_INFO_LOG("closing slot %d\n", slot_num);
1132 close_receiver(slot_num);
1133 clear_slot(slot_num);
1136 static void close_unused_slots(void)
1141 if (must_close_slot(i))
1146 * Cleanup all resources.
1148 * This performs various cleanups, removes the audiod socket and closes the
1149 * connection to para_server.
1151 static void audiod_cleanup(void)
1154 unlink(socket_name);
1156 close_unused_slots();
1157 audiod_cmdline_parser_free(&conf);
1158 close_stat_clients();
1162 * Check if any receivers/filters/writers need to be started and do so if
1165 static void start_stop_decoders(void)
1168 struct slot_info *sl;
1170 close_unused_slots();
1171 if (audiod_status != AUDIOD_ON ||
1172 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1173 return notify_receivers(E_NOT_PLAYING);
1174 if (!must_start_decoder())
1176 ret = open_receiver(stat_task->current_audio_format_num);
1178 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1184 activate_grab_clients(&sched);
1185 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1188 static void status_pre_select(struct sched *s, void *context)
1190 struct status_task *st = context;
1191 int i, ret, cafn = stat_task->current_audio_format_num;
1193 if (must_start_decoder())
1196 if (must_close_slot(i))
1198 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1201 if (st->ct && audiod_status == AUDIOD_OFF)
1203 if (!st->ct && audiod_status != AUDIOD_OFF)
1204 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1206 sched_request_barrier(&afi[cafn].restart_barrier, s);
1208 * If para_server is playing we'd like to have a smooth time display
1209 * even if we are running in standby mode. So we request a timeout that
1210 * expires at the next full second.
1212 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1213 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1219 /* restart the client task if necessary */
1220 static int status_post_select(struct sched *s, void *context)
1222 struct status_task *st = context;
1225 ret = task_get_notification(st->task);
1228 if (audiod_status == AUDIOD_OFF) {
1231 if (task_status(st->ct->task) >= 0) {
1232 task_notify(st->ct->task, E_AUDIOD_OFF);
1236 st->clock_diff_count = conf.clock_diff_count_arg;
1243 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1248 if (st->ct->status != CL_EXECUTING)
1251 struct timeval diff;
1252 tv_diff(now, &st->last_status_read, &diff);
1253 if (diff.tv_sec > 61)
1254 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1257 btr_merge(st->btrn, st->min_iqs);
1258 sz = btr_next_buffer(st->btrn, &buf);
1259 ret = for_each_stat_item(buf, sz, update_item);
1261 task_notify(st->ct->task, -ret);
1265 btr_consume(st->btrn, sz - ret);
1266 st->last_status_read = *now;
1268 } else /* current status item crosses buffers */
1269 st->min_iqs = sz + 1;
1272 btr_drain(st->btrn);
1273 st->current_audio_format_num = -1;
1274 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1276 if (st->clock_diff_count) { /* get status only one time */
1277 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1279 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1280 st->clock_diff_count--;
1281 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1282 set_stat_task_restart_barrier(2);
1285 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1287 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1288 set_stat_task_restart_barrier(5);
1290 free(stat_item_values[SI_BASENAME]);
1291 stat_item_values[SI_BASENAME] = para_strdup(
1292 "no connection to para_server");
1293 stat_client_write_item(SI_BASENAME);
1294 st->last_status_read = *now;
1296 start_stop_decoders();
1300 static void init_status_task(struct status_task *st)
1302 memset(st, 0, sizeof(struct status_task));
1303 st->sa_time_diff_sign = 1;
1304 st->clock_diff_count = conf.clock_diff_count_arg;
1305 st->current_audio_format_num = -1;
1306 st->btrn = btr_new_node(&(struct btr_node_description)
1307 EMBRACE(.name = "stat"));
1309 stat_task->task = task_register(&(struct task_info) {
1311 .pre_select = status_pre_select,
1312 .post_select = status_post_select,
1313 .context = stat_task,
1317 static void set_initial_status(void)
1319 audiod_status = AUDIOD_ON;
1320 if (!conf.mode_given)
1322 if (!strcmp(conf.mode_arg, "sb")) {
1323 audiod_status = AUDIOD_STANDBY;
1326 if (!strcmp(conf.mode_arg, "off")) {
1327 audiod_status = AUDIOD_OFF;
1330 if (strcmp(conf.mode_arg, "on"))
1331 PARA_WARNING_LOG("invalid mode\n");
1334 __noreturn static void print_help_and_die(void)
1336 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1337 bool d = conf.detailed_help_given;
1340 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1341 ggo_print_help(&h, flags);
1343 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1344 print_receiver_helps(flags);
1345 print_filter_helps(flags);
1346 print_writer_helps(flags);
1351 * the main function of para_audiod
1353 * \param argc usual argument count
1354 * \param argv usual argument vector
1356 * \return EXIT_SUCCESS or EXIT_FAILURE
1358 * \sa para_audiod(1)
1360 int main(int argc, char *argv[])
1363 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1364 struct audiod_cmdline_parser_params params = {
1367 .check_required = 0,
1368 .check_ambiguity = 0,
1373 audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms);
1374 daemon_set_loglevel(conf.loglevel_arg);
1375 version_handle_flag("audiod", conf.version_given);
1376 /* init receivers/filters/writers early to make help work */
1380 if (conf.help_given || conf.detailed_help_given)
1381 print_help_and_die();
1382 daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1383 parse_config_or_die();
1384 daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1385 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1386 init_random_seed_or_die();
1387 daemon_set_flag(DF_LOG_TIME);
1388 daemon_set_flag(DF_LOG_HOSTNAME);
1389 daemon_set_flag(DF_LOG_LL);
1390 if (conf.log_timing_given)
1391 daemon_set_flag(DF_LOG_TIMING);
1392 if (conf.logfile_given) {
1393 daemon_set_logfile(conf.logfile_arg);
1394 daemon_open_log_or_die();
1396 ret = parse_stream_args();
1398 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1401 daemon_log_welcome("para_audiod");
1402 daemon_set_start_time();
1403 set_initial_status();
1406 setup_signal_handling();
1408 init_status_task(stat_task);
1409 init_command_task(cmd_task);
1411 if (conf.daemon_given)
1412 daemonize(false /* parent exits immediately */);
1414 signal_task->task = task_register(&(struct task_info) {
1416 .pre_select = signal_pre_select,
1417 .post_select = signal_post_select,
1418 .context = signal_task,
1421 sched.default_timeout.tv_sec = 2;
1422 sched.default_timeout.tv_usec = 999 * 1000;
1423 ret = schedule(&sched);
1425 sched_shutdown(&sched);
1426 signal_shutdown(signal_task);
1429 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1430 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;