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>
22 #include "audiod.cmdline.h"
26 #include "buffer_tree.h"
29 #include "grab_client.h"
30 #include "client.cmdline.h"
38 #include "write_common.h"
42 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
43 /** define the array of error lists needed by para_audiod */
45 /** define the array containing all supported audio formats */
46 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
48 DEFINE_RECEIVER_ARRAY;
50 /** Defines how audiod handles one supported audio format. */
51 struct audio_format_info {
52 /** pointer to the receiver for this audio format */
53 struct receiver *receiver;
54 /** the receiver configuration */
56 /** the number of filters that should be activated for this audio format */
57 unsigned int num_filters;
58 /** Array of filter numbers to be activated. */
59 unsigned *filter_nums;
60 /** Pointer to the array of filter configurations. */
62 /** the number of filters that should be activated for this audio format */
63 unsigned int num_writers;
64 /** Array of writer numbers to be activated. */
66 /** pointer to the array of writer configurations */
68 /** do not start receiver/filters/writer before this time */
69 struct timeval restart_barrier;
72 /* Describes one instance of a receiver-filter-writer chain. */
74 /* Number of the audio format in this slot. */
76 /* The stream_start status item announced by para_server. */
77 struct timeval server_stream_start;
78 /* The offset status item announced by para_server. */
79 unsigned offset_seconds;
80 /* The seconds_total status item announced by para_server. */
81 unsigned seconds_total;
82 /* The receiver info associated with this slot. */
83 struct receiver_node *receiver_node;
84 /* The array of filter nodes. */
85 struct filter_node *fns;
86 /* The array of writers attached to the last filter. */
87 struct writer_node *wns;
90 /** Maximal number of simultaneous instances. */
91 #define MAX_STREAM_SLOTS 5
93 /** Iterate over all slots. */
94 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
97 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
98 * be associated with a receiver/filter/writer triple. This array holds all
99 * information on the status of these slots.
101 * \sa struct slot_info
103 struct slot_info slot[MAX_STREAM_SLOTS];
105 /** The vss status flags audiod is interested in. */
106 enum vss_status_flags {
107 /** Whether the 'N' flag is set. */
108 VSS_STATUS_FLAG_NEXT = 1,
109 /** The 'P' flag is set. */
110 VSS_STATUS_FLAG_PLAYING = 2,
114 * The scheduler instance of para_audiod.
116 * This is needed also in audiod_command.c (for the tasks command), so it can
117 * not be made static.
119 struct sched sched = {.max_fileno = 0};
121 /* The task for obtaining para_server's status (para_client stat). */
123 /** The associated task structure of audiod. */
125 /** Client data associated with the stat task. */
126 struct client_task *ct;
127 /** Do not restart client command until this time. */
128 struct timeval restart_barrier;
129 /** Last time we received status data from para_server. */
130 struct timeval last_status_read;
132 /** The offset value announced by para_server. */
134 /** The length of the current audio file as announced by para_server. */
136 /** The start of the current stream from the view of para_server. */
137 struct timeval server_stream_start;
138 /** The average time deviation between para_server and para_audiod. */
139 struct timeval sa_time_diff;
140 /** Whether client time is ahead of server time. */
141 int sa_time_diff_sign;
142 /** The 'P' and the 'N' flags as announced by para_server. */
143 enum vss_status_flags vss_status;
144 /** Number of times the clock difference is to be checked. */
145 unsigned clock_diff_count;
146 /** When to start the next check for clock difference. */
147 struct timeval clock_diff_barrier;
148 /** Number of the audio format as announced by para_server. */
149 int current_audio_format_num;
150 /* The status task btrn is the child of the client task. */
151 struct btr_node *btrn;
154 /** The array of status items sent by para_server. */
155 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
158 * the current mode of operation of which can be changed by the on/off/cycle
159 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
161 int audiod_status = AUDIOD_ON;
164 * the gengetopt args_info struct that holds information on all command line
167 struct audiod_args_info conf;
169 static char *socket_name;
170 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
172 static struct signal_task *signal_task;
174 static struct status_task status_task_struct;
176 static uid_t *uid_whitelist;
179 * the task that calls the status command of para_server
181 * \sa struct status_task
183 static struct status_task *stat_task = &status_task_struct;
186 * The task for handling audiod commands.
188 * We need two listening sockets for backward compability: on Linux systems
189 * fd[0] is an abstract socket (more precisely, a socket bound to an address in
190 * the abstract namespace), and fd[1] is the usual pathname socket. On other
191 * systems, fd[0] is negative, and only the pathname socket is used.
193 * For 0.5.x we accept connections on both sockets to make sure that old
194 * para_audioc versions can still connect. New versions use only the abstract
195 * socket. Hence after v0.6.0 we can go back to a single socket, either an
196 * abstract one (Linux) or a pathname socket (all other systems).
198 struct command_task {
199 /** The local listening sockets. */
201 /** the associated task structure */
205 /** iterate over all supported audio formats */
206 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
209 * Get the audio format number.
211 * \param name The name of the audio format.
213 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
214 * \a name is not a supported audio format.
216 static int get_audio_format_num(const char *name)
220 while (para_isspace(*name))
222 FOR_EACH_AUDIO_FORMAT(i)
223 if (!strcmp(name, audio_formats[i]))
225 return -E_UNSUPPORTED_AUDIO_FORMAT;
229 * Return the flags for the \a decoder_flags status item.
231 * Allocates a string which contains one octal digit per slot. Bit zero (value
232 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
233 * have the analogous meaning for filter and writer, respectively.
235 * \return String that must be freed by the caller.
237 __malloc char *audiod_get_decoder_flags(void)
240 char flags[MAX_STREAM_SLOTS + 1];
243 struct slot_info *s = &slot[i];
245 if (s->receiver_node)
253 flags[MAX_STREAM_SLOTS] = '\0';
254 return para_strdup(flags);
257 static int get_matching_audio_format_nums(const char *re)
262 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
266 FOR_EACH_AUDIO_FORMAT(i)
267 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
273 static int get_play_time_slot_num(void)
275 int i, oldest_slot = -1;
276 struct timeval oldest_wstime = {0, 0};
279 struct slot_info *s = &slot[i];
280 struct timeval wstime;
281 if (!s->wns || !s->wns[0].btrn)
283 btr_get_node_start(s->wns[0].btrn, &wstime);
284 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
286 oldest_wstime = wstime;
293 * Compute the play time based on information of the current slot.
295 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
296 * from the status items received from para_server and the start time of the
297 * (first) writer of the current slot.
299 * It has to take into account that the stream was probably not started at
300 * the beginning of the file, that the clock between the server and the client
301 * host may differ and that playback of the stream was delayed, e.g. because
302 * the prebuffer filter is used in the filter configuration.
304 * If no writer is active, for example because para_audiod runs in standby
305 * mode, an approximation based only on the status items is computed and the
306 * returned string is prefixed with "~".
308 * \return A string that must be freed by the caller.
310 char *get_time_string(void)
312 int ret, seconds = 0, length = stat_task->length_seconds;
313 struct timeval *tmp, sum, sss, /* server stream start */
314 rstime, /* receiver start time */
315 wstime, /* writer start time */
316 wtime, /* now - writer start */
317 rskip; /* receiver start - sss */
318 int slot_num = get_play_time_slot_num();
319 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
322 if (audiod_status == AUDIOD_OFF)
324 if (stat_task->server_stream_start.tv_sec == 0) {
325 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
326 goto out; /* server is about to change file */
327 if (length > 0) /* paused */
329 goto empty; /* stopped */
332 * Valid status items and playing, set length and tmp to the stream
333 * start. We use the slot info and fall back to the info from current
334 * status items if no slot info is available.
336 tmp = &stat_task->server_stream_start;
337 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
338 btr_get_node_start(s->wns[0].btrn, &wstime);
339 if (wstime.tv_sec != 0) { /* writer wrote something */
340 if (s->server_stream_start.tv_sec == 0) {
341 /* copy status info to slot */
342 s->server_stream_start = stat_task->server_stream_start;
343 s->offset_seconds = stat_task->offset_seconds;
344 s->seconds_total = stat_task->length_seconds;
346 length = s->seconds_total;
347 tmp = &s->server_stream_start;
350 if (stat_task->sa_time_diff_sign > 0)
351 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
353 tv_add(tmp, &stat_task->sa_time_diff, &sss);
354 if (!s || !s->wns || !s->wns[0].btrn || wstime.tv_sec == 0) {
356 tv_diff(now, &sss, &diff);
357 seconds = diff.tv_sec + stat_task->offset_seconds;
360 tv_diff(now, &wstime, &wtime);
361 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
362 seconds = s->offset_seconds;
363 if (s->receiver_node->btrn) {
364 btr_get_node_start(s->receiver_node->btrn, &rstime);
365 ret = tv_diff(&rstime, &sss, &rskip);
366 if (ret > 0) { /* audiod was started in the middle of the stream */
367 tv_add(&wtime, &rskip, &sum);
368 seconds += sum.tv_sec;
370 seconds += wtime.tv_sec;
372 seconds += wtime.tv_sec;
374 seconds = PARA_MIN(seconds, length);
375 seconds = PARA_MAX(seconds, 0);
377 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
381 (length - seconds) / 60,
382 (length - seconds) % 60,
383 length? (seconds * 100 + length / 2) / length : 0,
387 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
390 return para_strdup(NULL);
393 static void parse_config_or_die(void)
397 struct audiod_cmdline_parser_params params = {
401 .check_ambiguity = 0,
405 if (conf.config_file_given)
406 config_file = para_strdup(conf.config_file_arg);
408 char *home = para_homedir();
409 config_file = make_message("%s/.paraslash/audiod.conf", home);
412 ret = file_exists(config_file);
413 if (conf.config_file_given && !ret) {
414 PARA_EMERG_LOG("can not read config file %s\n", config_file);
419 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
420 daemon_set_loglevel(conf.loglevel_arg);
423 if (conf.user_allow_given > 0) {
424 uid_whitelist = para_malloc(conf.user_allow_given
426 for (i = 0; i < conf.user_allow_given; i++) {
429 ret = para_atoi32(conf.user_allow_arg[i], &val);
431 uid_whitelist[i] = val;
434 errno = 0; /* see getpwnam(3) */
435 pw = getpwnam(conf.user_allow_arg[i]);
437 PARA_EMERG_LOG("invalid username: %s\n",
438 conf.user_allow_arg[i]);
441 uid_whitelist[i] = pw->pw_uid;
449 static void setup_signal_handling(void)
451 signal_task = signal_init_or_die();
452 para_install_sighandler(SIGINT);
453 para_install_sighandler(SIGTERM);
454 para_install_sighandler(SIGHUP);
455 para_sigaction(SIGPIPE, SIG_IGN);
458 static void clear_slot(int slot_num)
460 struct slot_info *s = &slot[slot_num];
462 PARA_INFO_LOG("clearing slot %d\n", slot_num);
463 memset(s, 0, sizeof(struct slot_info));
467 static void close_receiver(int slot_num)
469 struct slot_info *s = &slot[slot_num];
470 struct audio_format_info *a;
472 if (s->format < 0 || !s->receiver_node)
475 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
476 audio_formats[s->format], slot_num);
477 a->receiver->close(s->receiver_node);
478 btr_remove_node(&s->receiver_node->btrn);
479 task_reap(&s->receiver_node->task);
480 free(s->receiver_node);
481 s->receiver_node = NULL;
482 stat_task->current_audio_format_num = -1;
483 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
484 &a->restart_barrier);
487 static void writer_cleanup(struct writer_node *wn)
493 w = writers + wn->writer_num;
494 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
496 btr_remove_node(&wn->btrn);
497 task_reap(&wn->task);
500 static void close_writers(struct slot_info *s)
502 struct audio_format_info *a;
509 if (a->num_writers == 0)
510 writer_cleanup(s->wns);
512 for (i = 0; i < a->num_writers; i++)
513 writer_cleanup(s->wns + i);
519 static void close_filters(struct slot_info *s)
522 struct audio_format_info *a = afi + s->format;
523 if (a->num_filters == 0)
525 for (i = a->num_filters - 1; i >= 0; i--) {
526 struct filter_node *fn = s->fns + i;
527 const struct filter *f;
531 f = filter_get(fn->filter_num);
534 btr_remove_node(&fn->btrn);
535 task_reap(&fn->task);
541 static void notify_receivers(int error)
546 struct slot_info *s = slot + i;
549 if (!s->receiver_node)
551 task_notify(s->receiver_node->task, error);
555 static int get_empty_slot(void)
566 if (s->wns || s->receiver_node || s->fns)
571 return -E_NO_MORE_SLOTS;
574 static void open_filters(struct slot_info *s)
576 struct audio_format_info *a = afi + s->format;
577 struct filter_node *fn;
578 int nf = a->num_filters;
579 struct btr_node *parent;
584 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
585 assert(s->fns == NULL);
586 s->fns = para_calloc(nf * sizeof(struct filter_node));
587 parent = s->receiver_node->btrn;
588 for (i = 0; i < nf; i++) {
590 const struct filter *f = filter_get(a->filter_nums[i]);
592 fn->filter_num = a->filter_nums[i];
593 fn->conf = a->filter_conf[i];
594 fn->btrn = btr_new_node(&(struct btr_node_description)
595 EMBRACE(.name = f->name, .parent = parent,
596 .handler = f->execute, .context = fn));
599 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
600 fn->task = task_register(&(struct task_info) {
602 .pre_select = f->pre_select,
603 .post_select = f->post_select,
607 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
608 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
612 static void open_writers(struct slot_info *s)
615 struct audio_format_info *a = afi + s->format;
616 struct writer_node *wn;
617 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
619 assert(s->wns == NULL);
620 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
621 * sizeof(struct writer_node));
622 for (i = 0; i < a->num_writers; i++) {
624 wn->conf = a->writer_conf[i];
625 wn->writer_num = a->writer_nums[i];
626 register_writer_node(wn, parent, &sched);
627 PARA_NOTICE_LOG("%s writer started in slot %d\n",
628 writer_names[a->writer_nums[i]], (int)(s - slot));
632 /* returns slot num on success */
633 static int open_receiver(int format)
635 struct audio_format_info *a = &afi[format];
638 struct receiver *r = a->receiver;
639 struct receiver_node *rn;
641 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
642 ret = get_empty_slot();
646 rn = para_calloc(sizeof(*rn));
648 rn->conf = a->receiver_conf;
649 rn->btrn = btr_new_node(&(struct btr_node_description)
650 EMBRACE(.name = r->name, .context = rn));
653 btr_remove_node(&rn->btrn);
659 s->receiver_node = rn;
660 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
661 audio_formats[format], r->name, slot_num);
662 rn->task = task_register(&(struct task_info) {
664 .pre_select = r->pre_select,
665 .post_select = r->post_select,
671 static bool receiver_running(void)
674 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
677 struct slot_info *s = &slot[i];
678 long unsigned ss2 = s->server_stream_start.tv_sec;
680 if (!s->receiver_node)
682 if (task_status(s->receiver_node->task) >= 0)
691 * Return the root node of the current buffer tree.
693 * This is only used for stream grabbing.
695 * \return \p NULL if no slot is currently active. If more than one buffer tree
696 * exists, the node corresponding to the most recently started receiver is
699 struct btr_node *audiod_get_btr_root(void)
701 int i, newest_slot = -1;
702 struct timeval newest_rstime = {0, 0};
705 struct slot_info *s = &slot[i];
706 struct timeval rstime;
707 if (!s->receiver_node)
709 if (task_status(s->receiver_node->task) < 0)
711 btr_get_node_start(s->receiver_node->btrn, &rstime);
712 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
714 newest_rstime = rstime;
717 if (newest_slot == -1)
719 return slot[newest_slot].receiver_node->btrn;
722 /* whether a new instance of a decoder should be started. */
723 static bool must_start_decoder(void)
725 int cafn = stat_task->current_audio_format_num;
726 unsigned vs = stat_task->vss_status;
728 if (audiod_status != AUDIOD_ON)
734 if (vs & VSS_STATUS_FLAG_NEXT)
736 if (!(vs & VSS_STATUS_FLAG_PLAYING))
738 if (receiver_running())
740 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
745 static void compute_time_diff(const struct timeval *status_time)
747 struct timeval tmp, diff;
748 static unsigned count;
749 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
750 const struct timeval max_deviation = {0, 500 * 1000};
751 const int time_smooth = 5;
753 sign = tv_diff(status_time, now, &diff);
754 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
755 // sign, sa_time_diff_sign);
757 sa_time_diff_sign = sign;
758 stat_task->sa_time_diff = diff;
763 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
764 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
765 PARA_WARNING_LOG("time diff jump: %lims\n",
769 sa_time_diff_sign = tv_convex_combination(
770 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
771 count > 10? sign : sign * time_smooth, &diff,
773 stat_task->sa_time_diff = tmp;
774 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
777 sa_time_diff_sign < 0? "-" : "+",
778 tv2ms(&stat_task->sa_time_diff)
781 stat_task->sa_time_diff_sign = sa_time_diff_sign;
784 static int update_item(int itemnum, char *buf)
786 long unsigned sec, usec;
788 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
790 free(stat_item_values[itemnum]);
791 stat_item_values[itemnum] = para_strdup(buf);
792 stat_client_write_item(itemnum);
794 case SI_STATUS_FLAGS:
795 stat_task->vss_status = 0;
796 if (strchr(buf, 'N'))
797 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
798 if (strchr(buf, 'P'))
799 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
802 stat_task->offset_seconds = atoi(buf);
804 case SI_SECONDS_TOTAL:
805 stat_task->length_seconds = atoi(buf);
807 case SI_STREAM_START:
808 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
809 stat_task->server_stream_start.tv_sec = sec;
810 stat_task->server_stream_start.tv_usec = usec;
813 case SI_CURRENT_TIME:
814 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
815 struct timeval tv = {sec, usec};
816 compute_time_diff(&tv);
820 stat_task->current_audio_format_num
821 = get_audio_format_num(buf);
826 static int parse_stream_command(const char *txt, char **cmd)
829 char *re, *p = strchr(txt, ':');
832 return -E_MISSING_COLON;
835 re = malloc(len + 1);
836 strncpy(re, txt, len);
838 ret = get_matching_audio_format_nums(re);
843 static int add_filter(int format, char *cmdline)
845 struct audio_format_info *a = &afi[format];
846 int filter_num, nf = a->num_filters;
849 filter_num = check_filter_arg(cmdline, &cfg);
852 a->filter_conf = para_realloc(a->filter_conf,
853 (nf + 1) * sizeof(void *));
854 a->filter_nums = para_realloc(a->filter_nums,
855 (nf + 1) * sizeof(unsigned));
856 a->filter_nums[nf] = filter_num;
857 a->filter_conf[nf] = cfg;
859 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
860 filter_get(filter_num)->name);
864 static int parse_writer_args(void)
868 struct audio_format_info *a;
870 for (i = 0; i < conf.writer_given; i++) {
872 int j, nw, writer_num, af_mask;
874 ret = parse_stream_command(conf.writer_arg[i], &cmd);
878 FOR_EACH_AUDIO_FORMAT(j) {
880 if ((af_mask & (1 << j)) == 0) /* no match */
882 wconf = check_writer_arg_or_die(cmd, &writer_num);
884 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
885 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
886 a->writer_nums[nw] = writer_num;
887 a->writer_conf[nw] = wconf;
888 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
889 nw, writer_names[writer_num]);
893 /* Use default writer for audio formats which are not yet set up. */
894 FOR_EACH_AUDIO_FORMAT(i) {
898 if (a->num_writers > 0)
899 continue; /* already set up */
900 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
901 a->writer_nums = para_malloc(sizeof(int));
902 a->writer_nums[0] = writer_num;
903 a->writer_conf = para_malloc(sizeof(void *));
904 a->writer_conf[0] = writer_conf;
906 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
907 writer_names[writer_num]);
912 static int parse_receiver_args(void)
914 int i, ret, receiver_num;
916 struct audio_format_info *a;
918 for (i = conf.receiver_given - 1; i >= 0; i--) {
922 ret = parse_stream_command(conf.receiver_arg[i], &arg);
926 FOR_EACH_AUDIO_FORMAT(j) {
928 if ((af_mask & (1 << j)) == 0) /* no match */
931 * If multiple receivers are given for this audio format, the
932 * last one wins and we have to free the previous receiver
933 * config here. Since we are iterating backwards, the winning
934 * receiver arg is in fact the first one given.
936 if (a->receiver_conf)
937 a->receiver->free_config(a->receiver_conf);
938 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
939 ret = -E_RECV_SYNTAX;
940 if (!a->receiver_conf)
942 a->receiver = receivers + receiver_num;
946 * Use the first available receiver with no arguments for those audio
947 * formats for which no receiver was specified.
949 cmd = para_strdup(receivers[0].name);
950 FOR_EACH_AUDIO_FORMAT(i) {
952 if (a->receiver_conf)
954 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
955 if (!a->receiver_conf)
956 return -E_RECV_SYNTAX;
957 a->receiver = &receivers[receiver_num];
959 FOR_EACH_AUDIO_FORMAT(i) {
961 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
962 audio_formats[i], a->receiver->name);
970 static int init_default_filters(void)
974 FOR_EACH_AUDIO_FORMAT(i) {
975 struct audio_format_info *a = &afi[i];
980 continue; /* no default -- nothing to to */
982 * udp and dccp streams are fec-encoded, so add fecdec as the
985 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
986 strcmp(afi[i].receiver->name, "dccp") == 0) {
987 tmp = para_strdup("fecdec");
993 /* add "dec" to audio format name */
994 tmp = make_message("%sdec", audio_formats[i]);
995 for (j = 0; filter_get(j); j++)
996 if (!strcmp(tmp, filter_get(j)->name))
999 ret = -E_UNSUPPORTED_FILTER;
1002 tmp = para_strdup(filter_get(j)->name);
1003 ret = add_filter(i, tmp);
1007 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1008 filter_get(j)->name);
1014 static int parse_filter_args(void)
1016 int i, j, ret, af_mask, num_matches;
1018 for (i = 0; i < conf.filter_given; i++) {
1020 ret = parse_stream_command(conf.filter_arg[i], &arg);
1025 FOR_EACH_AUDIO_FORMAT(j) {
1026 if ((af_mask & (1 << j)) == 0) /* no match */
1028 ret = add_filter(j, arg);
1033 if (num_matches == 0)
1034 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1035 conf.filter_arg[i]);
1037 ret = init_default_filters(); /* use default values for the rest */
1042 static int parse_stream_args(void)
1046 ret = parse_receiver_args();
1049 ret = parse_filter_args();
1052 ret = parse_writer_args();
1058 /* does not unlink socket on errors */
1059 static void init_local_sockets(struct command_task *ct)
1061 if (conf.socket_given)
1062 socket_name = para_strdup(conf.socket_arg);
1064 char *hn = para_hostname();
1065 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1069 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1070 if (conf.force_given)
1071 unlink(socket_name);
1072 ct->fd[0] = create_local_socket(socket_name, 0);
1073 ct->fd[1] = create_local_socket(socket_name,
1074 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1075 if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1077 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1081 static int signal_post_select(struct sched *s, void *context)
1083 struct signal_task *st = context;
1086 ret = task_get_notification(st->task);
1089 signum = para_next_signal(&s->rfds);
1094 PARA_NOTICE_LOG("received signal %d\n", signum);
1095 task_notify_all(s, E_AUDIOD_SIGNAL);
1096 return -E_AUDIOD_SIGNAL;
1101 static void command_pre_select(struct sched *s, void *context)
1103 struct command_task *ct = context;
1106 for (i = 0; i < 2; i++)
1108 para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1111 static int command_post_select(struct sched *s, void *context)
1114 struct command_task *ct = context;
1115 static struct timeval last_status_dump;
1116 struct timeval tmp, delay;
1119 ret = task_get_notification(ct->task);
1122 for (i = 0; i < 2; i++) {
1125 ret = handle_connect(ct->fd[i], &s->rfds, uid_whitelist);
1127 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1128 if (ret == -E_AUDIOD_TERM) {
1129 task_notify_all(s, -ret);
1138 /* if last status dump was less than 500ms ago, do nothing */
1140 delay.tv_usec = 500 * 1000;
1141 tv_add(&last_status_dump, &delay, &tmp);
1142 if (tv_diff(now, &tmp, NULL) < 0)
1146 * If last status dump was more than 5s ago, force update. Otherwise,
1147 * update only those items that have changed.
1151 tv_add(&last_status_dump, &delay, &tmp);
1152 if (tv_diff(now, &tmp, NULL) > 0)
1155 audiod_status_dump(force);
1156 last_status_dump = *now;
1160 static void init_command_task(struct command_task *ct)
1162 init_local_sockets(ct); /* doesn't return on errors */
1164 ct->task = task_register(&(struct task_info) {
1166 .pre_select = command_pre_select,
1167 .post_select = command_post_select,
1172 static void close_stat_pipe(void)
1176 task_reap(&stat_task->ct->task);
1177 client_close(stat_task->ct);
1178 stat_task->ct = NULL;
1179 clear_and_dump_items();
1180 stat_task->length_seconds = 0;
1181 stat_task->offset_seconds = 0;
1182 stat_task->vss_status = 0;
1183 stat_task->current_audio_format_num = -1;
1184 audiod_status_dump(true);
1187 /* avoid busy loop if server is down */
1188 static void set_stat_task_restart_barrier(unsigned seconds)
1190 struct timeval delay = {seconds, 0};
1191 tv_add(now, &delay, &stat_task->restart_barrier);
1194 static bool must_close_slot(int slot_num)
1196 struct slot_info *s = &slot[slot_num];
1197 struct audio_format_info *a = afi + s->format;
1202 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1204 for (i = 0; i < a->num_filters; i++)
1205 if (s->fns && task_status(s->fns[i].task) >= 0)
1207 if (a->num_writers > 0) {
1208 for (i = 0; i < a->num_writers; i++)
1209 if (s->wns && task_status(s->wns[i].task) >= 0)
1212 if (s->wns && task_status(s->wns[0].task) >= 0)
1218 static void close_slot(int slot_num)
1220 struct slot_info *s = slot + slot_num;
1222 PARA_INFO_LOG("closing slot %d\n", slot_num);
1225 close_receiver(slot_num);
1226 clear_slot(slot_num);
1229 static void close_unused_slots(void)
1234 if (must_close_slot(i))
1239 * Cleanup all resources.
1241 * This performs various cleanups, removes the audiod socket and closes the
1242 * connection to para_server.
1244 static void audiod_cleanup(void)
1247 unlink(socket_name);
1249 close_unused_slots();
1250 audiod_cmdline_parser_free(&conf);
1251 close_stat_clients();
1252 free(uid_whitelist);
1256 * Check if any receivers/filters/writers need to be started and do so if
1259 static void start_stop_decoders(void)
1262 struct slot_info *sl;
1264 close_unused_slots();
1265 if (audiod_status != AUDIOD_ON ||
1266 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1267 return notify_receivers(E_NOT_PLAYING);
1268 if (!must_start_decoder())
1270 ret = open_receiver(stat_task->current_audio_format_num);
1272 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1278 activate_grab_clients(&sched);
1279 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1282 static void status_pre_select(struct sched *s, void *context)
1284 struct status_task *st = context;
1285 int i, ret, cafn = stat_task->current_audio_format_num;
1287 if (must_start_decoder())
1290 if (must_close_slot(i))
1292 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1295 if (st->ct && audiod_status == AUDIOD_OFF)
1297 if (!st->ct && audiod_status != AUDIOD_OFF)
1298 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1300 sched_request_barrier(&afi[cafn].restart_barrier, s);
1302 * If para_server is playing we'd like to have a smooth time display
1303 * even if we are running in standby mode. So we request a timeout that
1304 * expires at the next full second.
1306 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1307 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1313 /* restart the client task if necessary */
1314 static int status_post_select(struct sched *s, void *context)
1316 struct status_task *st = context;
1319 ret = task_get_notification(st->task);
1322 if (audiod_status == AUDIOD_OFF) {
1325 if (task_status(st->ct->task) >= 0) {
1326 task_notify(st->ct->task, E_AUDIOD_OFF);
1330 st->clock_diff_count = conf.clock_diff_count_arg;
1337 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1342 if (st->ct->status != CL_EXECUTING)
1345 struct timeval diff;
1346 tv_diff(now, &st->last_status_read, &diff);
1347 if (diff.tv_sec > 61)
1348 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1351 btr_merge(st->btrn, st->min_iqs);
1352 sz = btr_next_buffer(st->btrn, &buf);
1353 ret = for_each_stat_item(buf, sz, update_item);
1355 task_notify(st->ct->task, -ret);
1359 btr_consume(st->btrn, sz - ret);
1360 st->last_status_read = *now;
1362 } else /* current status item crosses buffers */
1363 st->min_iqs = sz + 1;
1366 btr_drain(st->btrn);
1367 st->current_audio_format_num = -1;
1368 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1370 if (st->clock_diff_count) { /* get status only one time */
1371 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1373 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1374 st->clock_diff_count--;
1375 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1376 set_stat_task_restart_barrier(2);
1379 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1381 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1382 set_stat_task_restart_barrier(5);
1384 free(stat_item_values[SI_BASENAME]);
1385 stat_item_values[SI_BASENAME] = para_strdup(
1386 "no connection to para_server");
1387 stat_client_write_item(SI_BASENAME);
1388 st->last_status_read = *now;
1390 start_stop_decoders();
1394 static void init_status_task(struct status_task *st)
1396 memset(st, 0, sizeof(struct status_task));
1397 st->sa_time_diff_sign = 1;
1398 st->clock_diff_count = conf.clock_diff_count_arg;
1399 st->current_audio_format_num = -1;
1400 st->btrn = btr_new_node(&(struct btr_node_description)
1401 EMBRACE(.name = "stat"));
1403 stat_task->task = task_register(&(struct task_info) {
1405 .pre_select = status_pre_select,
1406 .post_select = status_post_select,
1407 .context = stat_task,
1411 static void set_initial_status(void)
1413 audiod_status = AUDIOD_ON;
1414 if (!conf.mode_given)
1416 if (!strcmp(conf.mode_arg, "sb")) {
1417 audiod_status = AUDIOD_STANDBY;
1420 if (!strcmp(conf.mode_arg, "off")) {
1421 audiod_status = AUDIOD_OFF;
1424 if (strcmp(conf.mode_arg, "on"))
1425 PARA_WARNING_LOG("invalid mode\n");
1428 __noreturn static void print_help_and_die(void)
1430 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1431 bool d = conf.detailed_help_given;
1434 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1435 ggo_print_help(&h, flags);
1437 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1438 print_receiver_helps(flags);
1439 print_filter_helps(flags);
1440 print_writer_helps(flags);
1445 * the main function of para_audiod
1447 * \param argc usual argument count
1448 * \param argv usual argument vector
1450 * \return EXIT_SUCCESS or EXIT_FAILURE
1452 * \sa para_audiod(1)
1454 int main(int argc, char *argv[])
1457 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1458 struct audiod_cmdline_parser_params params = {
1461 .check_required = 0,
1462 .check_ambiguity = 0,
1467 audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms);
1468 daemon_set_loglevel(conf.loglevel_arg);
1469 version_handle_flag("audiod", conf.version_given);
1470 /* init receivers/filters/writers early to make help work */
1474 if (conf.help_given || conf.detailed_help_given)
1475 print_help_and_die();
1476 daemon_set_priority(conf.priority_arg);
1477 daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1478 parse_config_or_die();
1479 daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1480 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1481 init_random_seed_or_die();
1482 daemon_set_flag(DF_LOG_TIME);
1483 daemon_set_flag(DF_LOG_HOSTNAME);
1484 daemon_set_flag(DF_LOG_LL);
1485 if (conf.log_timing_given)
1486 daemon_set_flag(DF_LOG_TIMING);
1487 if (conf.logfile_given) {
1488 daemon_set_logfile(conf.logfile_arg);
1489 daemon_open_log_or_die();
1491 ret = parse_stream_args();
1493 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1496 daemon_log_welcome("audiod");
1497 daemon_set_start_time();
1498 set_initial_status();
1501 setup_signal_handling();
1503 init_status_task(stat_task);
1504 init_command_task(cmd_task);
1506 if (conf.daemon_given)
1507 daemonize(false /* parent exits immediately */);
1509 signal_task->task = task_register(&(struct task_info) {
1511 .pre_select = signal_pre_select,
1512 .post_select = signal_post_select,
1513 .context = signal_task,
1516 sched.default_timeout.tv_sec = 2;
1517 sched.default_timeout.tv_usec = 999 * 1000;
1518 ret = schedule(&sched);
1520 sched_shutdown(&sched);
1521 signal_shutdown(signal_task);
1524 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1525 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;