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 /** Array of error strings. */
45 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
46 /** define the array containing all supported audio formats */
47 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
49 DEFINE_RECEIVER_ARRAY;
51 /** Defines how audiod handles one supported audio format. */
52 struct audio_format_info {
53 /** pointer to the receiver for this audio format */
54 struct receiver *receiver;
55 /** the receiver configuration */
57 /** the number of filters that should be activated for this audio format */
58 unsigned int num_filters;
59 /** Array of filter numbers to be activated. */
60 unsigned *filter_nums;
61 /** Pointer to the array of filter configurations. */
63 /** the number of filters that should be activated for this audio format */
64 unsigned int num_writers;
65 /** Array of writer numbers to be activated. */
67 /** pointer to the array of writer configurations */
69 /** do not start receiver/filters/writer before this time */
70 struct timeval restart_barrier;
73 /* Describes one instance of a receiver-filter-writer chain. */
75 /* Number of the audio format in this slot. */
77 /* The stream_start status item announced by para_server. */
78 struct timeval server_stream_start;
79 /* The offset status item announced by para_server. */
80 unsigned offset_seconds;
81 /* The seconds_total status item announced by para_server. */
82 unsigned seconds_total;
83 /* The receiver info associated with this slot. */
84 struct receiver_node *receiver_node;
85 /* The array of filter nodes. */
86 struct filter_node *fns;
87 /* The array of writers attached to the last filter. */
88 struct writer_node *wns;
91 /** Maximal number of simultaneous instances. */
92 #define MAX_STREAM_SLOTS 5
94 /** Iterate over all slots. */
95 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
98 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
99 * be associated with a receiver/filter/writer triple. This array holds all
100 * information on the status of these slots.
102 * \sa struct slot_info
104 struct slot_info slot[MAX_STREAM_SLOTS];
106 /** The vss status flags audiod is interested in. */
107 enum vss_status_flags {
108 /** Whether the 'N' flag is set. */
109 VSS_STATUS_FLAG_NEXT = 1,
110 /** The 'P' flag is set. */
111 VSS_STATUS_FLAG_PLAYING = 2,
115 * The scheduler instance of para_audiod.
117 * This is needed also in audiod_command.c (for the tasks command), so it can
118 * not be made static.
120 struct sched sched = {.max_fileno = 0};
122 /* The task for obtaining para_server's status (para_client stat). */
124 /** The associated task structure of audiod. */
126 /** Client data associated with the stat task. */
127 struct client_task *ct;
128 /** Do not restart client command until this time. */
129 struct timeval restart_barrier;
130 /** Last time we received status data from para_server. */
131 struct timeval last_status_read;
133 /** The offset value announced by para_server. */
135 /** The length of the current audio file as announced by para_server. */
137 /** The start of the current stream from the view of para_server. */
138 struct timeval server_stream_start;
139 /** The average time deviation between para_server and para_audiod. */
140 struct timeval sa_time_diff;
141 /** Whether client time is ahead of server time. */
142 int sa_time_diff_sign;
143 /** The 'P' and the 'N' flags as announced by para_server. */
144 enum vss_status_flags vss_status;
145 /** Number of times the clock difference is to be checked. */
146 unsigned clock_diff_count;
147 /** When to start the next check for clock difference. */
148 struct timeval clock_diff_barrier;
149 /** Number of the audio format as announced by para_server. */
150 int current_audio_format_num;
151 /* The status task btrn is the child of the client task. */
152 struct btr_node *btrn;
155 /** The array of status items sent by para_server. */
156 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
159 * the current mode of operation of which can be changed by the on/off/cycle
160 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
162 int audiod_status = AUDIOD_ON;
165 * the gengetopt args_info struct that holds information on all command line
168 static struct audiod_args_info conf;
170 static char *socket_name;
171 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
173 static struct signal_task *signal_task;
175 static struct status_task status_task_struct;
177 static uid_t *uid_whitelist;
180 * the task that calls the status command of para_server
182 * \sa struct status_task
184 static struct status_task *stat_task = &status_task_struct;
186 struct command_task {
187 /** The local listening socket. */
189 /** the associated task structure */
193 /** iterate over all supported audio formats */
194 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
197 * Get the audio format number.
199 * \param name The name of the audio format.
201 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
202 * \a name is not a supported audio format.
204 static int get_audio_format_num(const char *name)
208 while (para_isspace(*name))
210 FOR_EACH_AUDIO_FORMAT(i)
211 if (!strcmp(name, audio_formats[i]))
213 return -E_UNSUPPORTED_AUDIO_FORMAT;
217 * Return the flags for the \a decoder_flags status item.
219 * Allocates a string which contains one octal digit per slot. Bit zero (value
220 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
221 * have the analogous meaning for filter and writer, respectively.
223 * \return String that must be freed by the caller.
225 __malloc char *audiod_get_decoder_flags(void)
228 char flags[MAX_STREAM_SLOTS + 1];
231 struct slot_info *s = &slot[i];
233 if (s->receiver_node)
241 flags[MAX_STREAM_SLOTS] = '\0';
242 return para_strdup(flags);
245 static int get_matching_audio_format_nums(const char *re)
250 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
254 FOR_EACH_AUDIO_FORMAT(i)
255 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
261 static int get_play_time_slot_num(void)
263 int i, oldest_slot = -1;
264 struct timeval oldest_wstime = {0, 0};
267 struct slot_info *s = &slot[i];
268 struct timeval wstime;
269 if (!s->wns || !s->wns[0].btrn)
271 btr_get_node_start(s->wns[0].btrn, &wstime);
272 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
274 oldest_wstime = wstime;
281 * Compute the play time based on information of the current slot.
283 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
284 * from the status items received from para_server and the start time of the
285 * (first) writer of the current slot.
287 * It has to take into account that the stream was probably not started at
288 * the beginning of the file, that the clock between the server and the client
289 * host may differ and that playback of the stream was delayed, e.g. because
290 * the prebuffer filter is used in the filter configuration.
292 * If no writer is active, for example because para_audiod runs in standby
293 * mode, an approximation based only on the status items is computed and the
294 * returned string is prefixed with "~".
296 * \return A string that must be freed by the caller.
298 char *get_time_string(void)
300 int ret, seconds = 0, length = stat_task->length_seconds;
301 struct timeval *tmp, sum, sss, /* server stream start */
302 rstime, /* receiver start time */
303 wstime, /* writer start time */
304 wtime, /* now - writer start */
305 rskip; /* receiver start - sss */
306 int slot_num = get_play_time_slot_num();
307 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
310 if (audiod_status == AUDIOD_OFF)
312 if (stat_task->server_stream_start.tv_sec == 0) {
313 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
314 goto out; /* server is about to change file */
315 if (length > 0) /* paused */
317 goto empty; /* stopped */
320 * Valid status items and playing, set length and tmp to the stream
321 * start. We use the slot info and fall back to the info from current
322 * status items if no slot info is available.
324 tmp = &stat_task->server_stream_start;
325 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
326 btr_get_node_start(s->wns[0].btrn, &wstime);
327 if (wstime.tv_sec != 0) { /* writer wrote something */
328 if (s->server_stream_start.tv_sec == 0) {
329 /* copy status info to slot */
330 s->server_stream_start = stat_task->server_stream_start;
331 s->offset_seconds = stat_task->offset_seconds;
332 s->seconds_total = stat_task->length_seconds;
334 length = s->seconds_total;
335 tmp = &s->server_stream_start;
338 if (stat_task->sa_time_diff_sign > 0)
339 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
341 tv_add(tmp, &stat_task->sa_time_diff, &sss);
342 if (!s || !s->wns || !s->wns[0].btrn || wstime.tv_sec == 0) {
344 tv_diff(now, &sss, &diff);
345 seconds = diff.tv_sec + stat_task->offset_seconds;
348 tv_diff(now, &wstime, &wtime);
349 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
350 seconds = s->offset_seconds;
351 if (s->receiver_node->btrn) {
352 btr_get_node_start(s->receiver_node->btrn, &rstime);
353 ret = tv_diff(&rstime, &sss, &rskip);
354 if (ret > 0 && rskip.tv_sec > 2) {
355 /* audiod was started in the middle of the stream */
356 tv_add(&wtime, &rskip, &sum);
357 seconds += sum.tv_sec;
359 seconds += wtime.tv_sec;
361 seconds += wtime.tv_sec;
363 seconds = PARA_MIN(seconds, length);
364 seconds = PARA_MAX(seconds, 0);
366 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
370 (length - seconds) / 60,
371 (length - seconds) % 60,
372 length? (seconds * 100 + length / 2) / length : 0,
376 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
379 return para_strdup(NULL);
382 static void parse_config_or_die(void)
386 struct audiod_cmdline_parser_params params = {
390 .check_ambiguity = 0,
394 if (conf.config_file_given)
395 config_file = para_strdup(conf.config_file_arg);
397 char *home = para_homedir();
398 config_file = make_message("%s/.paraslash/audiod.conf", home);
401 ret = file_exists(config_file);
402 if (conf.config_file_given && !ret) {
403 PARA_EMERG_LOG("can not read config file %s\n", config_file);
408 audiod_cmdline_parser_config_file(config_file, &conf, ¶ms);
409 daemon_set_loglevel(conf.loglevel_arg);
412 if (conf.user_allow_given > 0) {
413 uid_whitelist = para_malloc(conf.user_allow_given
415 for (i = 0; i < conf.user_allow_given; i++) {
418 ret = para_atoi32(conf.user_allow_arg[i], &val);
420 uid_whitelist[i] = val;
423 errno = 0; /* see getpwnam(3) */
424 pw = getpwnam(conf.user_allow_arg[i]);
426 PARA_EMERG_LOG("invalid username: %s\n",
427 conf.user_allow_arg[i]);
430 uid_whitelist[i] = pw->pw_uid;
438 static void setup_signal_handling(void)
440 signal_task = signal_init_or_die();
441 para_install_sighandler(SIGINT);
442 para_install_sighandler(SIGTERM);
443 para_install_sighandler(SIGHUP);
444 para_sigaction(SIGPIPE, SIG_IGN);
447 static void clear_slot(int slot_num)
449 struct slot_info *s = &slot[slot_num];
451 PARA_INFO_LOG("clearing slot %d\n", slot_num);
452 memset(s, 0, sizeof(struct slot_info));
456 static void close_receiver(int slot_num)
458 struct slot_info *s = &slot[slot_num];
459 struct audio_format_info *a;
461 if (s->format < 0 || !s->receiver_node)
464 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
465 audio_formats[s->format], slot_num);
466 a->receiver->close(s->receiver_node);
467 btr_remove_node(&s->receiver_node->btrn);
468 task_reap(&s->receiver_node->task);
469 free(s->receiver_node);
470 s->receiver_node = NULL;
471 stat_task->current_audio_format_num = -1;
472 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
473 &a->restart_barrier);
476 static void writer_cleanup(struct writer_node *wn)
482 w = writers + wn->writer_num;
483 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
485 btr_remove_node(&wn->btrn);
486 task_reap(&wn->task);
489 static void close_writers(struct slot_info *s)
491 struct audio_format_info *a;
498 if (a->num_writers == 0)
499 writer_cleanup(s->wns);
501 for (i = 0; i < a->num_writers; i++)
502 writer_cleanup(s->wns + i);
508 static void close_filters(struct slot_info *s)
511 struct audio_format_info *a = afi + s->format;
512 if (a->num_filters == 0)
514 for (i = a->num_filters - 1; i >= 0; i--) {
515 struct filter_node *fn = s->fns + i;
516 const struct filter *f;
520 f = filter_get(fn->filter_num);
523 btr_remove_node(&fn->btrn);
524 task_reap(&fn->task);
530 static void notify_receivers(int error)
535 struct slot_info *s = slot + i;
538 if (!s->receiver_node)
540 task_notify(s->receiver_node->task, error);
544 static int get_empty_slot(void)
555 if (s->wns || s->receiver_node || s->fns)
560 return -E_NO_MORE_SLOTS;
563 static void open_filters(struct slot_info *s)
565 struct audio_format_info *a = afi + s->format;
566 struct filter_node *fn;
567 int nf = a->num_filters;
568 struct btr_node *parent;
573 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
574 assert(s->fns == NULL);
575 s->fns = para_calloc(nf * sizeof(struct filter_node));
576 parent = s->receiver_node->btrn;
577 for (i = 0; i < nf; i++) {
579 const struct filter *f = filter_get(a->filter_nums[i]);
581 fn->filter_num = a->filter_nums[i];
582 fn->conf = a->filter_conf[i];
583 fn->btrn = btr_new_node(&(struct btr_node_description)
584 EMBRACE(.name = f->name, .parent = parent,
585 .handler = f->execute, .context = fn));
589 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
590 fn->task = task_register(&(struct task_info) {
592 .pre_select = f->pre_select,
593 .post_select = f->post_select,
597 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
598 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
602 static void open_writers(struct slot_info *s)
605 struct audio_format_info *a = afi + s->format;
606 struct writer_node *wn;
607 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
609 assert(s->wns == NULL);
610 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
611 * sizeof(struct writer_node));
612 for (i = 0; i < a->num_writers; i++) {
614 wn->conf = a->writer_conf[i];
615 wn->writer_num = a->writer_nums[i];
616 register_writer_node(wn, parent, &sched);
617 PARA_NOTICE_LOG("%s writer started in slot %d\n",
618 writer_names[a->writer_nums[i]], (int)(s - slot));
622 /* returns slot num on success */
623 static int open_receiver(int format)
625 struct audio_format_info *a = &afi[format];
628 struct receiver *r = a->receiver;
629 struct receiver_node *rn;
631 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
632 ret = get_empty_slot();
636 rn = para_calloc(sizeof(*rn));
638 rn->conf = a->receiver_conf;
639 rn->btrn = btr_new_node(&(struct btr_node_description)
640 EMBRACE(.name = r->name, .context = rn));
643 btr_remove_node(&rn->btrn);
649 s->receiver_node = rn;
650 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
651 audio_formats[format], r->name, slot_num);
652 rn->task = task_register(&(struct task_info) {
654 .pre_select = r->pre_select,
655 .post_select = r->post_select,
661 static bool receiver_running(void)
664 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
667 struct slot_info *s = &slot[i];
668 long unsigned ss2 = s->server_stream_start.tv_sec;
670 if (!s->receiver_node)
672 if (task_status(s->receiver_node->task) >= 0)
681 * Return the root node of the current buffer tree.
683 * This is only used for stream grabbing.
685 * \return \p NULL if no slot is currently active. If more than one buffer tree
686 * exists, the node corresponding to the most recently started receiver is
689 struct btr_node *audiod_get_btr_root(void)
691 int i, newest_slot = -1;
692 struct timeval newest_rstime = {0, 0};
695 struct slot_info *s = &slot[i];
696 struct timeval rstime;
697 if (!s->receiver_node)
699 if (task_status(s->receiver_node->task) < 0)
701 btr_get_node_start(s->receiver_node->btrn, &rstime);
702 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
704 newest_rstime = rstime;
707 if (newest_slot == -1)
709 return slot[newest_slot].receiver_node->btrn;
712 /* whether a new instance of a decoder should be started. */
713 static bool must_start_decoder(void)
715 int cafn = stat_task->current_audio_format_num;
716 unsigned vs = stat_task->vss_status;
718 if (audiod_status != AUDIOD_ON)
724 if (vs & VSS_STATUS_FLAG_NEXT)
726 if (!(vs & VSS_STATUS_FLAG_PLAYING))
728 if (receiver_running())
730 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
735 static void compute_time_diff(const struct timeval *status_time)
737 struct timeval tmp, diff;
738 static unsigned count;
739 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
740 const struct timeval max_deviation = {0, 500 * 1000};
741 const int time_smooth = 5;
743 sign = tv_diff(status_time, now, &diff);
744 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
745 // sign, sa_time_diff_sign);
747 sa_time_diff_sign = sign;
748 stat_task->sa_time_diff = diff;
753 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
754 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
755 PARA_WARNING_LOG("time diff jump: %lums\n",
759 sa_time_diff_sign = tv_convex_combination(
760 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
761 count > 10? sign : sign * time_smooth, &diff,
763 stat_task->sa_time_diff = tmp;
764 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
767 sa_time_diff_sign < 0? "-" : "+",
768 tv2ms(&stat_task->sa_time_diff)
771 stat_task->sa_time_diff_sign = sa_time_diff_sign;
774 static int update_item(int itemnum, char *buf)
776 long unsigned sec, usec;
778 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
780 free(stat_item_values[itemnum]);
781 stat_item_values[itemnum] = para_strdup(buf);
782 stat_client_write_item(itemnum);
784 case SI_STATUS_FLAGS:
785 stat_task->vss_status = 0;
786 if (strchr(buf, 'N'))
787 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
788 if (strchr(buf, 'P'))
789 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
792 stat_task->offset_seconds = atoi(buf);
794 case SI_SECONDS_TOTAL:
795 stat_task->length_seconds = atoi(buf);
797 case SI_STREAM_START:
798 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
799 stat_task->server_stream_start.tv_sec = sec;
800 stat_task->server_stream_start.tv_usec = usec;
803 case SI_CURRENT_TIME:
804 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
805 struct timeval tv = {sec, usec};
806 compute_time_diff(&tv);
810 stat_task->current_audio_format_num
811 = get_audio_format_num(buf);
816 static int parse_stream_command(const char *txt, char **cmd)
819 char *re, *p = strchr(txt, ':');
822 return -E_MISSING_COLON;
825 re = malloc(len + 1);
826 strncpy(re, txt, len);
828 ret = get_matching_audio_format_nums(re);
833 static int add_filter(int format, char *cmdline)
835 struct audio_format_info *a = &afi[format];
836 int filter_num, nf = a->num_filters;
839 filter_num = check_filter_arg(cmdline, &cfg);
842 a->filter_conf = para_realloc(a->filter_conf,
843 (nf + 1) * sizeof(void *));
844 a->filter_nums = para_realloc(a->filter_nums,
845 (nf + 1) * sizeof(unsigned));
846 a->filter_nums[nf] = filter_num;
847 a->filter_conf[nf] = cfg;
849 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
850 filter_get(filter_num)->name);
854 static int parse_writer_args(void)
858 struct audio_format_info *a;
860 for (i = 0; i < conf.writer_given; i++) {
862 int j, nw, writer_num, af_mask;
864 ret = parse_stream_command(conf.writer_arg[i], &cmd);
868 FOR_EACH_AUDIO_FORMAT(j) {
870 if ((af_mask & (1 << j)) == 0) /* no match */
872 wconf = check_writer_arg_or_die(cmd, &writer_num);
874 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
875 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
876 a->writer_nums[nw] = writer_num;
877 a->writer_conf[nw] = wconf;
878 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
879 nw, writer_names[writer_num]);
883 /* Use default writer for audio formats which are not yet set up. */
884 FOR_EACH_AUDIO_FORMAT(i) {
888 if (a->num_writers > 0)
889 continue; /* already set up */
890 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
891 a->writer_nums = para_malloc(sizeof(int));
892 a->writer_nums[0] = writer_num;
893 a->writer_conf = para_malloc(sizeof(void *));
894 a->writer_conf[0] = writer_conf;
896 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
897 writer_names[writer_num]);
902 static int parse_receiver_args(void)
904 int i, ret, receiver_num;
906 struct audio_format_info *a;
908 for (i = conf.receiver_given - 1; i >= 0; i--) {
912 ret = parse_stream_command(conf.receiver_arg[i], &arg);
916 FOR_EACH_AUDIO_FORMAT(j) {
918 if ((af_mask & (1 << j)) == 0) /* no match */
921 * If multiple receivers are given for this audio format, the
922 * last one wins and we have to free the previous receiver
923 * config here. Since we are iterating backwards, the winning
924 * receiver arg is in fact the first one given.
926 if (a->receiver_conf)
927 a->receiver->free_config(a->receiver_conf);
928 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
929 ret = -E_RECV_SYNTAX;
930 if (!a->receiver_conf)
932 a->receiver = receivers + receiver_num;
936 * Use the first available receiver with no arguments for those audio
937 * formats for which no receiver was specified.
939 cmd = para_strdup(receivers[0].name);
940 FOR_EACH_AUDIO_FORMAT(i) {
942 if (a->receiver_conf)
944 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
945 if (!a->receiver_conf)
946 return -E_RECV_SYNTAX;
947 a->receiver = &receivers[receiver_num];
949 FOR_EACH_AUDIO_FORMAT(i) {
951 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
952 audio_formats[i], a->receiver->name);
960 static int init_default_filters(void)
964 FOR_EACH_AUDIO_FORMAT(i) {
965 struct audio_format_info *a = &afi[i];
970 continue; /* no default -- nothing to to */
972 * udp and dccp streams are fec-encoded, so add fecdec as the
975 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
976 strcmp(afi[i].receiver->name, "dccp") == 0) {
977 tmp = para_strdup("fecdec");
983 /* add "dec" to audio format name */
984 tmp = make_message("%sdec", audio_formats[i]);
985 for (j = 0; filter_get(j); j++)
986 if (!strcmp(tmp, filter_get(j)->name))
989 ret = -E_UNSUPPORTED_FILTER;
992 tmp = para_strdup(filter_get(j)->name);
993 ret = add_filter(i, tmp);
997 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
998 filter_get(j)->name);
1004 static int parse_filter_args(void)
1006 int i, j, ret, af_mask, num_matches;
1008 for (i = 0; i < conf.filter_given; i++) {
1010 ret = parse_stream_command(conf.filter_arg[i], &arg);
1015 FOR_EACH_AUDIO_FORMAT(j) {
1016 if ((af_mask & (1 << j)) == 0) /* no match */
1018 ret = add_filter(j, arg);
1023 if (num_matches == 0)
1024 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1025 conf.filter_arg[i]);
1027 ret = init_default_filters(); /* use default values for the rest */
1032 static int parse_stream_args(void)
1036 ret = parse_receiver_args();
1039 ret = parse_filter_args();
1042 ret = parse_writer_args();
1048 /* does not unlink socket on errors */
1049 static void init_local_socket(struct command_task *ct)
1051 if (conf.socket_given)
1052 socket_name = para_strdup(conf.socket_arg);
1054 char *hn = para_hostname();
1055 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1059 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1060 if (conf.force_given)
1061 unlink(socket_name);
1062 ct->fd = create_local_socket(socket_name);
1065 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd));
1069 static int signal_post_select(struct sched *s, void *context)
1071 struct signal_task *st = context;
1074 ret = task_get_notification(st->task);
1077 signum = para_next_signal(&s->rfds);
1082 PARA_NOTICE_LOG("received signal %d\n", signum);
1083 task_notify_all(s, E_AUDIOD_SIGNAL);
1084 return -E_AUDIOD_SIGNAL;
1089 static void command_pre_select(struct sched *s, void *context)
1091 struct command_task *ct = context;
1092 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1095 static int command_post_select(struct sched *s, void *context)
1098 struct command_task *ct = context;
1099 static struct timeval last_status_dump;
1100 struct timeval tmp, delay;
1103 ret = task_get_notification(ct->task);
1106 ret = handle_connect(ct->fd, &s->rfds);
1108 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1109 if (ret == -E_AUDIOD_TERM) {
1110 task_notify_all(s, -ret);
1118 /* if last status dump was less than 500ms ago, do nothing */
1120 delay.tv_usec = 500 * 1000;
1121 tv_add(&last_status_dump, &delay, &tmp);
1122 if (tv_diff(now, &tmp, NULL) < 0)
1126 * If last status dump was more than 5s ago, force update. Otherwise,
1127 * update only those items that have changed.
1131 tv_add(&last_status_dump, &delay, &tmp);
1132 if (tv_diff(now, &tmp, NULL) > 0)
1135 audiod_status_dump(force);
1136 last_status_dump = *now;
1140 static void init_command_task(struct command_task *ct)
1142 init_local_socket(ct); /* doesn't return on errors */
1144 ct->task = task_register(&(struct task_info) {
1146 .pre_select = command_pre_select,
1147 .post_select = command_post_select,
1152 static void close_stat_pipe(void)
1156 task_reap(&stat_task->ct->task);
1157 client_close(stat_task->ct);
1158 stat_task->ct = NULL;
1159 clear_and_dump_items();
1160 stat_task->length_seconds = 0;
1161 stat_task->offset_seconds = 0;
1162 stat_task->vss_status = 0;
1163 stat_task->current_audio_format_num = -1;
1164 audiod_status_dump(true);
1167 /* avoid busy loop if server is down */
1168 static void set_stat_task_restart_barrier(unsigned seconds)
1170 struct timeval delay = {seconds, 0};
1171 tv_add(now, &delay, &stat_task->restart_barrier);
1174 static bool must_close_slot(int slot_num)
1176 struct slot_info *s = &slot[slot_num];
1177 struct audio_format_info *a = afi + s->format;
1182 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1184 for (i = 0; i < a->num_filters; i++)
1185 if (s->fns && task_status(s->fns[i].task) >= 0)
1187 if (a->num_writers > 0) {
1188 for (i = 0; i < a->num_writers; i++)
1189 if (s->wns && task_status(s->wns[i].task) >= 0)
1192 if (s->wns && task_status(s->wns[0].task) >= 0)
1198 static void close_slot(int slot_num)
1200 struct slot_info *s = slot + slot_num;
1202 PARA_INFO_LOG("closing slot %d\n", slot_num);
1205 close_receiver(slot_num);
1206 clear_slot(slot_num);
1209 static void close_unused_slots(void)
1215 if (must_close_slot(i)) {
1220 audiod_status_dump(true);
1224 * Cleanup all resources.
1226 * This performs various cleanups, removes the audiod socket and closes the
1227 * connection to para_server.
1229 static void audiod_cleanup(void)
1232 unlink(socket_name);
1234 close_unused_slots();
1235 audiod_cmdline_parser_free(&conf);
1236 close_stat_clients();
1237 free(uid_whitelist);
1241 * Check if any receivers/filters/writers need to be started and do so if
1244 static void start_stop_decoders(void)
1247 struct slot_info *sl;
1249 close_unused_slots();
1250 if (audiod_status != AUDIOD_ON ||
1251 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1252 return notify_receivers(E_NOT_PLAYING);
1253 if (!must_start_decoder())
1255 ret = open_receiver(stat_task->current_audio_format_num);
1257 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1263 activate_grab_clients(&sched);
1264 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1265 audiod_status_dump(true);
1268 static void status_pre_select(struct sched *s, void *context)
1270 struct status_task *st = context;
1271 int i, ret, cafn = stat_task->current_audio_format_num;
1273 if (must_start_decoder())
1276 if (must_close_slot(i))
1278 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1281 if (st->ct && audiod_status == AUDIOD_OFF)
1283 if (!st->ct && audiod_status != AUDIOD_OFF)
1284 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1286 sched_request_barrier(&afi[cafn].restart_barrier, s);
1288 * If para_server is playing we'd like to have a smooth time display
1289 * even if we are running in standby mode. So we request a timeout that
1290 * expires at the next full second.
1292 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1293 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1299 /* restart the client task if necessary */
1300 static int status_post_select(struct sched *s, void *context)
1302 struct status_task *st = context;
1305 ret = task_get_notification(st->task);
1308 if (audiod_status == AUDIOD_OFF) {
1311 if (task_status(st->ct->task) >= 0) {
1312 task_notify(st->ct->task, E_AUDIOD_OFF);
1316 st->clock_diff_count = conf.clock_diff_count_arg;
1323 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1328 if (st->ct->status != CL_EXECUTING)
1331 struct timeval diff;
1332 tv_diff(now, &st->last_status_read, &diff);
1333 if (diff.tv_sec > 61)
1334 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1337 btr_merge(st->btrn, st->min_iqs);
1338 sz = btr_next_buffer(st->btrn, &buf);
1339 ret = for_each_stat_item(buf, sz, update_item);
1341 task_notify(st->ct->task, -ret);
1345 btr_consume(st->btrn, sz - ret);
1346 st->last_status_read = *now;
1348 } else /* current status item crosses buffers */
1349 st->min_iqs = sz + 1;
1352 btr_drain(st->btrn);
1353 st->current_audio_format_num = -1;
1354 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1356 if (st->clock_diff_count) { /* get status only one time */
1357 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1359 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1360 st->clock_diff_count--;
1361 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1362 set_stat_task_restart_barrier(2);
1365 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1367 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1368 set_stat_task_restart_barrier(5);
1370 free(stat_item_values[SI_BASENAME]);
1371 stat_item_values[SI_BASENAME] = para_strdup(
1372 "no connection to para_server");
1373 stat_client_write_item(SI_BASENAME);
1374 st->last_status_read = *now;
1376 start_stop_decoders();
1380 static void init_status_task(struct status_task *st)
1382 memset(st, 0, sizeof(struct status_task));
1383 st->sa_time_diff_sign = 1;
1384 st->clock_diff_count = conf.clock_diff_count_arg;
1385 st->current_audio_format_num = -1;
1386 st->btrn = btr_new_node(&(struct btr_node_description)
1387 EMBRACE(.name = "stat"));
1389 stat_task->task = task_register(&(struct task_info) {
1391 .pre_select = status_pre_select,
1392 .post_select = status_post_select,
1393 .context = stat_task,
1397 static void set_initial_status(void)
1399 audiod_status = AUDIOD_ON;
1400 if (!conf.mode_given)
1402 if (!strcmp(conf.mode_arg, "sb")) {
1403 audiod_status = AUDIOD_STANDBY;
1406 if (!strcmp(conf.mode_arg, "off")) {
1407 audiod_status = AUDIOD_OFF;
1410 if (strcmp(conf.mode_arg, "on"))
1411 PARA_WARNING_LOG("invalid mode\n");
1414 __noreturn static void print_help_and_die(void)
1416 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1417 bool d = conf.detailed_help_given;
1420 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1421 ggo_print_help(&h, flags);
1423 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1424 print_receiver_helps(flags);
1425 print_filter_helps(flags);
1426 print_writer_helps(flags);
1431 * Lookup the given UID in the whitelist.
1433 * The whitelist is the array of arguments to the --user-allow opion. If the
1434 * option was not given, the array is empty, in which case the check succeeds.
1436 * \param uid User ID to look up.
1438 * \return True if --user-allow was not given, or if uid matches an element of
1441 bool uid_is_whitelisted(uid_t uid)
1445 if (!conf.user_allow_given)
1447 for (i = 0; i < conf.user_allow_given; i++)
1448 if (uid == uid_whitelist[i])
1454 * the main function of para_audiod
1456 * \param argc usual argument count
1457 * \param argv usual argument vector
1459 * \return EXIT_SUCCESS or EXIT_FAILURE
1461 * \sa para_audiod(1)
1463 int main(int argc, char *argv[])
1466 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1467 struct audiod_cmdline_parser_params params = {
1470 .check_required = 0,
1471 .check_ambiguity = 0,
1476 audiod_cmdline_parser_ext(argc, argv, &conf, ¶ms);
1477 daemon_set_loglevel(conf.loglevel_arg);
1478 version_handle_flag("audiod", conf.version_given);
1479 /* init receivers/filters/writers early to make help work */
1483 if (conf.help_given || conf.detailed_help_given)
1484 print_help_and_die();
1485 daemon_set_priority(conf.priority_arg);
1486 daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1487 parse_config_or_die();
1488 if (daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1489 conf.logfile_given)) {
1490 for (i = 0; i < conf.log_color_given; i++)
1491 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1493 init_random_seed_or_die();
1494 daemon_set_flag(DF_LOG_TIME);
1495 daemon_set_flag(DF_LOG_HOSTNAME);
1496 daemon_set_flag(DF_LOG_LL);
1497 if (conf.log_timing_given)
1498 daemon_set_flag(DF_LOG_TIMING);
1499 if (conf.logfile_given) {
1500 daemon_set_logfile(conf.logfile_arg);
1501 daemon_open_log_or_die();
1503 ret = parse_stream_args();
1505 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1508 daemon_log_welcome("audiod");
1509 daemon_set_start_time();
1510 set_initial_status();
1513 setup_signal_handling();
1515 init_status_task(stat_task);
1516 init_command_task(cmd_task);
1518 if (conf.daemon_given)
1519 daemonize(false /* parent exits immediately */);
1521 signal_task->task = task_register(&(struct task_info) {
1523 .pre_select = signal_pre_select,
1524 .post_select = signal_post_select,
1525 .context = signal_task,
1528 sched.default_timeout.tv_sec = 2;
1529 sched.default_timeout.tv_usec = 999 * 1000;
1530 ret = schedule(&sched);
1532 sched_shutdown(&sched);
1533 signal_shutdown(signal_task);
1536 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1537 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;