1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file audiod.c The paraslash's audio daemon. */
5 #include <netinet/in.h>
6 #include <sys/socket.h>
16 #include "audiod.lsg.h"
17 #include "recv_cmd.lsg.h"
24 #include "buffer_tree.h"
27 #include "grab_client.h"
38 /** Array of error strings. */
41 static struct lls_parse_result *lpr;
42 #define CMD_PTR (lls_cmd(0, audiod_suite))
43 #define OPT_RESULT(_name) (lls_opt_result(LSG_AUDIOD_PARA_AUDIOD_OPT_ ## _name, lpr))
44 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
45 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
46 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
47 #define ENUM_STRING_VAL(_name) (lls_enum_string_val(OPT_UINT32_VAL(_name), \
48 lls_opt(LSG_AUDIOD_PARA_AUDIOD_OPT_ ## _name, CMD_PTR)))
50 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
51 /** define the array containing all supported audio formats */
52 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
54 /** Defines how audiod handles one supported audio format. */
55 struct audio_format_info {
56 /** the receiver for this audio format */
58 /** Parsed receiver command line. */
59 struct lls_parse_result *receiver_lpr;
60 /** the number of filters that should be activated for this audio format */
61 unsigned int num_filters;
62 /** Array of filter numbers to be activated. */
63 unsigned *filter_nums;
64 /** Pointer to the array of filter configurations. */
66 /** Parsed filter command line, one parse result per filter. */
67 struct lls_parse_result **filter_lpr;
68 /** the number of filters that should be activated for this audio format */
69 unsigned int num_writers;
70 /** Array of writer IDs to be activated. */
72 /** Parsed writer command line(s) */
73 struct lls_parse_result **writer_lpr;
74 /** do not start receiver/filters/writer before this time */
75 struct timeval restart_barrier;
78 /* Describes one instance of a receiver-filter-writer chain. */
80 /* Number of the audio format in this slot. */
82 /* The stream_start status item announced by para_server. */
83 struct timeval server_stream_start;
84 /* The offset status item announced by para_server. */
85 unsigned offset_seconds;
86 /* The seconds_total status item announced by para_server. */
87 unsigned seconds_total;
88 /* The receiver info associated with this slot. */
89 struct receiver_node *receiver_node;
90 /* The array of filter nodes. */
91 struct filter_node *fns;
92 /* The array of writers attached to the last filter. */
93 struct writer_node *wns;
96 #define RECEIVER_CMD(_a) lls_cmd((_a)->receiver_num, recv_cmd_suite)
97 #define RECEIVER(_a) ((const struct receiver *)lls_user_data(RECEIVER_CMD(_a)))
99 /** Maximal number of simultaneous instances. */
100 #define MAX_STREAM_SLOTS 5
102 /** Iterate over all slots. */
103 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
106 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
107 * be associated with a receiver/filter/writer triple. This array holds all
108 * information on the status of these slots.
110 struct slot_info slot[MAX_STREAM_SLOTS];
112 /** The vss status flags audiod is interested in. */
113 enum vss_status_flags {
114 /** Whether the 'N' flag is set. */
115 VSS_STATUS_FLAG_NEXT = 1,
116 /** The 'P' flag is set. */
117 VSS_STATUS_FLAG_PLAYING = 2,
121 * The scheduler instance of para_audiod.
123 * This is needed also in audiod_command.c (for the tasks command), so it can
124 * not be made static.
126 struct sched sched = {.max_fileno = 0};
128 /* The task for obtaining para_server's status (para_client stat). */
130 /** The associated task structure of audiod. */
132 /** Client data associated with the stat task. */
133 struct client_task *ct;
134 /** Do not restart client command until this time. */
135 struct timeval restart_barrier;
136 /** Last time we received status data from para_server. */
137 struct timeval last_status_read;
139 /** The offset value announced by para_server. */
141 /** The length of the current audio file as announced by para_server. */
143 /** The start of the current stream from the view of para_server. */
144 struct timeval server_stream_start;
145 /** The average time deviation between para_server and para_audiod. */
146 struct timeval sa_time_diff;
147 /** Whether client time is ahead of server time. */
148 int sa_time_diff_sign;
149 /** The 'P' and the 'N' flags as announced by para_server. */
150 enum vss_status_flags vss_status;
151 /** Number of times the clock difference is to be checked. */
152 unsigned clock_diff_count;
153 /** When to start the next check for clock difference. */
154 struct timeval clock_diff_barrier;
155 /** Number of the audio format as announced by para_server. */
156 int current_audio_format_num;
157 /* The status task btrn is the child of the client task. */
158 struct btr_node *btrn;
161 /** The array of status items sent by para_server. */
162 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
165 * The current mode of operation (AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY).
166 * Set by the on/off/cycle commands.
168 int audiod_status = AUDIOD_ON;
170 static char *socket_name;
171 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
172 static struct signal_task *signal_task;
173 static struct status_task status_task_struct;
174 static uid_t *uid_whitelist;
177 * The task that calls the status command of para_server.
179 * \sa \ref struct status_task.
181 static struct status_task *stat_task = &status_task_struct;
183 struct command_task {
184 /** The local listening socket. */
186 /** The associated task structure. */
190 /** Iterate over all supported audio formats. */
191 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
194 * Get the audio format number.
196 * \param name The name of the audio format.
198 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
199 * \a name is not a supported audio format.
201 static int get_audio_format_num(const char *name)
205 while (para_isspace(*name))
207 FOR_EACH_AUDIO_FORMAT(i)
208 if (!strcmp(name, audio_formats[i]))
210 return -E_UNSUPPORTED_AUDIO_FORMAT;
214 * Return the flags for the \a decoder_flags status item.
216 * Allocates a string which contains one octal digit per slot. Bit zero (value
217 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
218 * have the analogous meaning for filter and writer, respectively.
220 * \return String that must be freed by the caller.
222 __malloc char *audiod_get_decoder_flags(void)
225 char flags[MAX_STREAM_SLOTS + 1];
228 struct slot_info *s = &slot[i];
230 if (s->receiver_node)
238 flags[MAX_STREAM_SLOTS] = '\0';
239 return para_strdup(flags);
242 static int get_matching_audio_format_nums(const char *re)
247 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
251 FOR_EACH_AUDIO_FORMAT(i)
252 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
258 static int get_play_time_slot_num(void)
260 int i, oldest_slot = -1;
261 struct timeval oldest_wstime = {0, 0};
264 struct slot_info *s = &slot[i];
265 struct timeval wstime;
266 if (!s->wns || !s->wns[0].btrn)
268 btr_get_node_start(s->wns[0].btrn, &wstime);
269 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
271 oldest_wstime = wstime;
278 * Compute the play time based on information of the current slot.
280 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
281 * from the status items received from para_server and the start time of the
282 * (first) writer of the current slot.
284 * It has to take into account that the stream was probably not started at
285 * the beginning of the file, that the clock between the server and the client
286 * host may differ and that playback of the stream was delayed, e.g. because
287 * the prebuffer filter is used in the filter configuration.
289 * If no writer is active, for example because para_audiod runs in standby
290 * mode, an approximation based only on the status items is computed and the
291 * returned string is prefixed with "~".
293 * \return A string that must be freed by the caller.
295 char *get_time_string(void)
297 int ret, seconds = 0, length = stat_task->length_seconds;
298 struct timeval *tmp, sum, sss, /* server stream start */
299 rstime, /* receiver start time */
300 wstime, /* writer start time */
301 wtime, /* now - writer start */
302 rskip; /* receiver start - sss */
303 int slot_num = get_play_time_slot_num();
304 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
305 bool writer_active = s && s->wns && s->wns[0].btrn;
308 if (audiod_status == AUDIOD_OFF)
310 if (stat_task->server_stream_start.tv_sec == 0) {
311 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
312 goto out; /* server is about to change file */
313 if (length > 0) /* paused */
315 goto empty; /* stopped */
318 * Valid status items and playing, set length and tmp to the stream
319 * start. We use the writer start time from the slot info and fall back
320 * to the info from current status items if no writer is active yet.
322 tmp = &stat_task->server_stream_start;
324 btr_get_node_start(s->wns[0].btrn, &wstime);
325 if (wstime.tv_sec != 0) { /* writer wrote something */
326 if (s->server_stream_start.tv_sec == 0) {
327 /* copy status info to slot */
328 s->server_stream_start = stat_task->server_stream_start;
329 s->offset_seconds = stat_task->offset_seconds;
330 s->seconds_total = stat_task->length_seconds;
332 length = s->seconds_total;
333 tmp = &s->server_stream_start;
336 if (stat_task->sa_time_diff_sign > 0)
337 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
339 tv_add(tmp, &stat_task->sa_time_diff, &sss);
340 if (!writer_active) {
342 tv_diff(now, &sss, &diff);
343 seconds = diff.tv_sec + stat_task->offset_seconds;
346 tv_diff(now, &wstime, &wtime);
347 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
348 seconds = s->offset_seconds;
349 if (s->receiver_node->btrn) {
350 btr_get_node_start(s->receiver_node->btrn, &rstime);
351 ret = tv_diff(&rstime, &sss, &rskip);
352 if (ret > 0 && rskip.tv_sec > 2) {
353 /* audiod was started in the middle of the stream */
354 tv_add(&wtime, &rskip, &sum);
355 seconds += sum.tv_sec;
357 seconds += wtime.tv_sec;
359 seconds += wtime.tv_sec;
361 seconds = PARA_MIN(seconds, length);
362 seconds = PARA_MAX(seconds, 0);
364 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
368 (length - seconds) / 60,
369 (length - seconds) % 60,
370 length? (seconds * 100 + length / 2) / length : 0,
374 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
377 return para_strdup(NULL);
380 static void parse_config_or_die(void)
385 ret = lsu_merge_config_file_options(OPT_STRING_VAL(CONFIG_FILE),
386 "audiod.conf", &lpr, CMD_PTR, audiod_suite, 0U /* flags */);
388 PARA_EMERG_LOG("failed to parse config file: %s\n",
389 para_strerror(-ret));
392 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
393 n = OPT_GIVEN(USER_ALLOW);
396 uid_whitelist = arr_alloc(n, sizeof(uid_t));
397 for (i = 0; i < n; i++) {
398 const char *arg = lls_string_val(i, OPT_RESULT(USER_ALLOW));
401 ret = para_atoi32(arg, &val);
403 uid_whitelist[i] = val;
408 PARA_EMERG_LOG("invalid username: %s\n", arg);
411 uid_whitelist[i] = pw->pw_uid;
415 static void setup_signal_handling(void)
417 signal_task = signal_init_or_die();
418 para_install_sighandler(SIGINT);
419 para_install_sighandler(SIGTERM);
420 para_install_sighandler(SIGHUP);
421 para_sigaction(SIGPIPE, SIG_IGN);
424 static void clear_slot(int slot_num)
426 struct slot_info *s = &slot[slot_num];
428 PARA_INFO_LOG("clearing slot %d\n", slot_num);
429 memset(s, 0, sizeof(struct slot_info));
433 static void close_receiver(int slot_num)
435 struct slot_info *s = &slot[slot_num];
436 struct audio_format_info *a;
438 if (s->format < 0 || !s->receiver_node)
441 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
442 audio_formats[s->format], slot_num);
443 RECEIVER(a)->close(s->receiver_node);
444 btr_remove_node(&s->receiver_node->btrn);
445 task_reap(&s->receiver_node->task);
446 free(s->receiver_node);
447 s->receiver_node = NULL;
448 if (audiod_status == AUDIOD_ON)
449 stat_task->current_audio_format_num = -1;
450 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
451 &a->restart_barrier);
454 static void writer_cleanup(struct writer_node *wn)
458 PARA_INFO_LOG("closing %s\n", writer_name(wn->wid));
459 writer_get(wn->wid)->close(wn);
460 btr_remove_node(&wn->btrn);
461 task_reap(&wn->task);
464 static void close_writers(struct slot_info *s)
466 struct audio_format_info *a;
473 if (a->num_writers == 0)
474 writer_cleanup(s->wns);
476 for (i = 0; i < a->num_writers; i++)
477 writer_cleanup(s->wns + i);
483 static void notify_writers(int error)
488 struct slot_info *s = slot + i;
489 struct audio_format_info *a;
495 for (j = 0; j < a->num_writers; j++)
496 task_notify(s->wns[j].task, error);
500 static void close_filters(struct slot_info *s)
503 struct audio_format_info *a = afi + s->format;
504 if (a->num_filters == 0)
506 for (i = a->num_filters - 1; i >= 0; i--) {
507 struct filter_node *fn = s->fns + i;
508 const struct filter *f;
512 f = filter_get(fn->filter_num);
515 btr_remove_node(&fn->btrn);
516 task_reap(&fn->task);
522 static void notify_receivers(int error)
527 struct slot_info *s = slot + i;
530 if (!s->receiver_node)
532 task_notify(s->receiver_node->task, error);
536 static int get_empty_slot(void)
547 if (s->wns || s->receiver_node || s->fns)
552 return -E_NO_MORE_SLOTS;
555 static void open_filters(struct slot_info *s)
557 struct audio_format_info *a = afi + s->format;
558 struct filter_node *fn;
559 int nf = a->num_filters;
560 struct btr_node *parent;
565 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
566 assert(s->fns == NULL);
567 s->fns = zalloc(nf * sizeof(struct filter_node));
568 parent = s->receiver_node->btrn;
569 for (i = 0; i < nf; i++) {
572 const struct filter *f = filter_get(a->filter_nums[i]);
574 fn->filter_num = a->filter_nums[i];
575 fn->conf = a->filter_conf[i];
576 fn->lpr = a->filter_lpr[i];
577 name = filter_name(fn->filter_num);
578 fn->btrn = btr_new_node(&(struct btr_node_description)
579 EMBRACE(.name = name, .parent = parent,
580 .handler = f->execute, .context = fn));
584 sprintf(buf, "%s (slot %d)", name, (int)(s - slot));
585 fn->task = task_register(&(struct task_info) {
587 .pre_select = f->pre_select,
588 .post_select = f->post_select,
592 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
593 audio_formats[s->format], i, nf, name, (int)(s - slot));
597 static void open_writers(struct slot_info *s)
600 struct audio_format_info *a = afi + s->format;
601 struct writer_node *wn;
602 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
604 assert(s->wns == NULL);
605 s->wns = zalloc(PARA_MAX(1U, a->num_writers)
606 * sizeof(struct writer_node));
607 for (i = 0; i < a->num_writers; i++) {
609 wn->wid = a->wids[i];
610 wn->lpr = a->writer_lpr[i];
611 register_writer_node(wn, parent, &sched);
612 PARA_NOTICE_LOG("%s writer started in slot %d\n",
613 writer_name(a->wids[i]), (int)(s - slot));
617 /* returns slot num on success */
618 static int open_receiver(int format)
620 struct audio_format_info *a = &afi[format];
623 const struct receiver *r = RECEIVER(a);
624 const char *name = lls_command_name(RECEIVER_CMD(a));
625 struct receiver_node *rn;
627 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
628 ret = get_empty_slot();
632 rn = zalloc(sizeof(*rn));
634 rn->lpr = a->receiver_lpr;
635 rn->btrn = btr_new_node(&(struct btr_node_description)
636 EMBRACE(.name = name, .context = rn));
639 PARA_ERROR_LOG("could not open %s receiver\n", name);
640 btr_remove_node(&rn->btrn);
646 s->receiver_node = rn;
647 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
648 audio_formats[format], name, slot_num);
649 rn->task = task_register(&(struct task_info) {
651 .pre_select = r->pre_select,
652 .post_select = r->post_select,
658 static bool receiver_running(void)
661 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
664 struct slot_info *s = &slot[i];
665 long unsigned ss2 = s->server_stream_start.tv_sec;
667 if (!s->receiver_node)
669 if (task_status(s->receiver_node->task) >= 0)
678 * Return the root node of the current buffer tree.
680 * This is only used for stream grabbing.
682 * \return \p NULL if no slot is currently active. If more than one buffer tree
683 * exists, the node corresponding to the most recently started receiver is
686 struct btr_node *audiod_get_btr_root(void)
688 int i, newest_slot = -1;
689 struct timeval newest_rstime = {0, 0};
692 struct slot_info *s = &slot[i];
693 struct timeval rstime;
694 if (!s->receiver_node)
696 if (task_status(s->receiver_node->task) < 0)
698 btr_get_node_start(s->receiver_node->btrn, &rstime);
699 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
701 newest_rstime = rstime;
704 if (newest_slot == -1)
706 return slot[newest_slot].receiver_node->btrn;
709 /* whether a new instance of a decoder should be started. */
710 static bool must_start_decoder(void)
712 int cafn = stat_task->current_audio_format_num;
713 unsigned vs = stat_task->vss_status;
715 if (audiod_status != AUDIOD_ON)
721 if (vs & VSS_STATUS_FLAG_NEXT)
723 if (!(vs & VSS_STATUS_FLAG_PLAYING))
725 if (receiver_running())
727 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
732 static void compute_time_diff(const struct timeval *status_time)
734 struct timeval tmp, diff;
735 static unsigned count;
736 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
737 const struct timeval max_deviation = {0, 500 * 1000};
738 const int time_smooth = 5;
740 sign = tv_diff(status_time, now, &diff);
741 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
742 // sign, sa_time_diff_sign);
744 sa_time_diff_sign = sign;
745 stat_task->sa_time_diff = diff;
750 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
751 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
752 PARA_WARNING_LOG("time diff jump: %c%lums\n",
753 s < 0? '-' : '+', tv2ms(&tmp));
756 sa_time_diff_sign = tv_convex_combination(
757 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
758 count > 10? sign : sign * time_smooth, &diff,
760 stat_task->sa_time_diff = tmp;
761 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
764 sa_time_diff_sign < 0? "-" : "+",
765 tv2ms(&stat_task->sa_time_diff)
768 stat_task->sa_time_diff_sign = sa_time_diff_sign;
771 static int update_item(int itemnum, char *buf)
773 long unsigned sec, usec;
775 if (stat_task->clock_diff_count && itemnum != SI_current_time)
777 free(stat_item_values[itemnum]);
778 stat_item_values[itemnum] = para_strdup(buf);
779 stat_client_write_item(itemnum);
781 case SI_status_flags:
782 stat_task->vss_status = 0;
783 if (strchr(buf, 'N'))
784 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
785 if (strchr(buf, 'P'))
786 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
789 stat_task->offset_seconds = atoi(buf);
791 case SI_seconds_total:
792 stat_task->length_seconds = atoi(buf);
794 case SI_stream_start:
795 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
796 stat_task->server_stream_start.tv_sec = sec;
797 stat_task->server_stream_start.tv_usec = usec;
800 case SI_current_time:
801 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
802 struct timeval tv = {sec, usec};
803 compute_time_diff(&tv);
807 stat_task->current_audio_format_num
808 = get_audio_format_num(buf);
813 static int parse_stream_command(const char *txt, const char **cmd)
816 char *re, *p = strchr(txt, ':');
819 return -E_MISSING_COLON;
823 strncpy(re, txt, len);
825 ret = get_matching_audio_format_nums(re);
830 static int add_filter(int format, const char *cmdline)
832 struct audio_format_info *a = &afi[format];
833 int filter_num, nf = a->num_filters;
835 struct lls_parse_result *flpr;
837 filter_num = filter_setup(cmdline, &cfg, &flpr);
838 a->filter_lpr = arr_realloc(a->filter_lpr, nf + 1, sizeof(flpr));
839 a->filter_conf = arr_realloc(a->filter_conf, nf + 1, sizeof(void *));
840 a->filter_nums = arr_realloc(a->filter_nums, nf + 1, sizeof(unsigned));
842 a->filter_nums[nf] = filter_num;
843 a->filter_conf[nf] = cfg;
844 a->filter_lpr[nf] = flpr;
846 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
847 filter_name(filter_num));
851 static int parse_writer_args(void)
855 struct audio_format_info *a;
857 for (i = 0; i < OPT_GIVEN(WRITER); i++) {
860 ret = parse_stream_command(lls_string_val(i,
861 OPT_RESULT(WRITER)), &cmd);
865 FOR_EACH_AUDIO_FORMAT(j) {
867 if ((af_mask & (1 << j)) == 0) /* no match */
870 a->wids = para_realloc(a->wids, (nw + 1) * sizeof(int));
871 a->writer_lpr = para_realloc(a->writer_lpr,
872 (nw + 1) * sizeof(struct lls_parse_result *));
873 a->wids[nw] = check_writer_arg_or_die(cmd,
875 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
876 nw, writer_name(a->wids[nw]));
880 /* Use default writer for audio formats which are not yet set up. */
881 FOR_EACH_AUDIO_FORMAT(i) {
883 if (a->num_writers > 0)
884 continue; /* already set up */
886 a->wids = alloc(sizeof(int));
887 a->writer_lpr = alloc(sizeof(struct lls_parse_result *));
888 a->wids[0] = check_writer_arg_or_die(NULL, a->writer_lpr);
889 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
890 writer_name(a->wids[0]));
895 static int parse_receiver_args(void)
899 struct audio_format_info *a;
901 FOR_EACH_AUDIO_FORMAT(i)
902 afi[i].receiver_num = -1;
903 for (i = OPT_GIVEN(RECEIVER) - 1; i >= 0; i--) {
906 ret = parse_stream_command(lls_string_val(i,
907 OPT_RESULT(RECEIVER)), &arg);
911 FOR_EACH_AUDIO_FORMAT(j) {
913 if ((af_mask & (1 << j)) == 0) /* no match */
916 * If multiple receivers are given for this audio format, the
917 * last one wins and we have to free the previous receiver
918 * config here. Since we are iterating backwards, the winning
919 * receiver arg is in fact the first one given.
921 lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
922 a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
926 * Use the default receiver for those audio formats for which no
927 * receiver was specified.
929 FOR_EACH_AUDIO_FORMAT(i) {
931 if (a->receiver_num >= 0)
933 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
935 FOR_EACH_AUDIO_FORMAT(i) {
937 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
938 audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
945 static int init_default_filters(void)
949 FOR_EACH_AUDIO_FORMAT(i) {
950 struct audio_format_info *a = &afi[i];
951 const char *name = lls_command_name(RECEIVER_CMD(a));
956 continue; /* no default -- nothing to to */
958 * udp and dccp streams are fec-encoded, so add fecdec as the
961 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
962 tmp = para_strdup("fecdec");
968 /* add "dec" to audio format name */
969 tmp = make_message("%sdec", audio_formats[i]);
970 for (j = 1; filter_get(j); j++)
971 if (!strcmp(tmp, filter_name(j)))
974 ret = -E_UNSUPPORTED_FILTER;
977 tmp = para_strdup(filter_name(j));
978 ret = add_filter(i, tmp);
982 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
989 static int parse_filter_args(void)
991 int i, j, ret, af_mask, num_matches;
993 for (i = 0; i < OPT_GIVEN(FILTER); i++) {
995 ret = parse_stream_command(lls_string_val(i,
996 OPT_RESULT(FILTER)), &arg);
1001 FOR_EACH_AUDIO_FORMAT(j) {
1002 if ((af_mask & (1 << j)) == 0) /* no match */
1004 ret = add_filter(j, arg);
1009 if (num_matches == 0)
1010 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1011 lls_string_val(i, OPT_RESULT(FILTER)));
1013 ret = init_default_filters(); /* use default values for the rest */
1018 static int parse_stream_args(void)
1022 ret = parse_receiver_args();
1025 ret = parse_filter_args();
1028 ret = parse_writer_args();
1034 /* does not unlink socket on errors */
1035 static void init_local_socket(struct command_task *ct)
1037 if (OPT_GIVEN(SOCKET))
1038 socket_name = para_strdup(OPT_STRING_VAL(SOCKET));
1040 char *hn = para_hostname();
1041 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1045 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1046 if (OPT_GIVEN(FORCE))
1047 unlink(socket_name);
1048 ct->fd = create_local_socket(socket_name);
1051 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd));
1055 static int signal_post_select(struct sched *s, void *context)
1057 struct signal_task *st = context;
1060 ret = task_get_notification(st->task);
1063 signum = para_next_signal(&s->rfds);
1068 PARA_WARNING_LOG("terminating on signal %d\n", signum);
1069 task_notify_all(s, E_AUDIOD_SIGNAL);
1070 return -E_AUDIOD_SIGNAL;
1075 static void command_pre_select(struct sched *s, void *context)
1077 struct command_task *ct = context;
1078 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1081 static int command_post_select(struct sched *s, void *context)
1084 struct command_task *ct = context;
1085 static struct timeval last_status_dump;
1086 struct timeval tmp, delay;
1089 ret = task_get_notification(ct->task);
1092 ret = handle_connect(ct->fd, &s->rfds);
1094 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1095 if (ret == -E_AUDIOD_TERM) {
1096 task_notify_all(s, -ret);
1104 /* if last status dump was less than 500ms ago, do nothing */
1106 delay.tv_usec = 500 * 1000;
1107 tv_add(&last_status_dump, &delay, &tmp);
1108 if (tv_diff(now, &tmp, NULL) < 0)
1112 * If last status dump was more than 5s ago, force update. Otherwise,
1113 * update only those items that have changed.
1117 tv_add(&last_status_dump, &delay, &tmp);
1118 if (tv_diff(now, &tmp, NULL) > 0)
1121 audiod_status_dump(force);
1122 last_status_dump = *now;
1126 static void init_command_task(struct command_task *ct)
1128 init_local_socket(ct); /* doesn't return on errors */
1130 ct->task = task_register(&(struct task_info) {
1132 .pre_select = command_pre_select,
1133 .post_select = command_post_select,
1138 static void close_stat_pipe(void)
1142 task_reap(&stat_task->ct->task);
1143 client_close(stat_task->ct);
1144 stat_task->ct = NULL;
1145 clear_and_dump_items();
1146 stat_task->length_seconds = 0;
1147 stat_task->offset_seconds = 0;
1148 stat_task->vss_status = 0;
1149 stat_task->current_audio_format_num = -1;
1150 audiod_status_dump(true);
1153 /* avoid busy loop if server is down */
1154 static void set_stat_task_restart_barrier(unsigned seconds)
1156 struct timeval delay = {seconds, 0};
1157 tv_add(now, &delay, &stat_task->restart_barrier);
1160 static bool must_close_slot(int slot_num)
1162 struct slot_info *s = &slot[slot_num];
1163 struct audio_format_info *a = afi + s->format;
1168 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1170 for (i = 0; i < a->num_filters; i++)
1171 if (s->fns && task_status(s->fns[i].task) >= 0)
1173 if (a->num_writers > 0) {
1174 for (i = 0; i < a->num_writers; i++)
1175 if (s->wns && task_status(s->wns[i].task) >= 0)
1178 if (s->wns && task_status(s->wns[0].task) >= 0)
1184 static void close_slot(int slot_num)
1186 struct slot_info *s = slot + slot_num;
1188 PARA_INFO_LOG("closing slot %d\n", slot_num);
1191 close_receiver(slot_num);
1192 clear_slot(slot_num);
1195 static void close_unused_slots(void)
1201 if (must_close_slot(i)) {
1206 audiod_status_dump(true);
1210 * Cleanup all resources.
1212 * This performs various cleanups, removes the audiod socket and closes the
1213 * connection to para_server.
1215 static void audiod_cleanup(void)
1218 unlink(socket_name);
1220 close_unused_slots();
1221 close_stat_clients();
1222 free(uid_whitelist);
1226 * Check if any receivers/filters/writers need to be started and do so if
1229 static void start_stop_decoders(void)
1232 struct slot_info *sl;
1234 close_unused_slots();
1235 if (audiod_status != AUDIOD_ON)
1236 return notify_writers(E_NOT_PLAYING);
1237 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1238 return notify_receivers(E_NOT_PLAYING);
1239 if (!must_start_decoder())
1241 ret = open_receiver(stat_task->current_audio_format_num);
1243 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1249 activate_grab_clients(&sched);
1250 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1251 audiod_status_dump(true);
1254 static void status_pre_select(struct sched *s, void *context)
1256 struct status_task *st = context;
1257 int i, ret, cafn = stat_task->current_audio_format_num;
1259 if (must_start_decoder())
1262 if (must_close_slot(i))
1264 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1267 if (st->ct && audiod_status == AUDIOD_OFF)
1269 if (!st->ct && audiod_status != AUDIOD_OFF)
1270 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1272 sched_request_barrier(&afi[cafn].restart_barrier, s);
1274 * If para_server is playing we'd like to have a smooth time display
1275 * even if we are running in standby mode. So we request a timeout that
1276 * expires at the next full second.
1278 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1279 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1285 /* restart the client task if necessary */
1286 static int status_post_select(struct sched *s, void *context)
1288 struct status_task *st = context;
1291 ret = task_get_notification(st->task);
1294 if (audiod_status == AUDIOD_OFF) {
1297 if (task_status(st->ct->task) >= 0) {
1298 task_notify(st->ct->task, E_AUDIOD_OFF);
1302 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1309 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1314 if (st->ct->status != CL_EXECUTING)
1317 struct timeval diff;
1318 tv_diff(now, &st->last_status_read, &diff);
1319 if (diff.tv_sec > 61)
1320 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1323 btr_merge(st->btrn, st->min_iqs);
1324 sz = btr_next_buffer(st->btrn, &buf);
1325 ret = for_each_stat_item(buf, sz, update_item);
1327 task_notify(st->ct->task, -ret);
1331 btr_consume(st->btrn, sz - ret);
1332 st->last_status_read = *now;
1334 } else /* current status item crosses buffers */
1335 st->min_iqs = sz + 1;
1338 btr_drain(st->btrn);
1339 st->current_audio_format_num = -1;
1340 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1342 if (st->clock_diff_count) { /* get status only one time */
1343 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1345 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1346 st->clock_diff_count--;
1347 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1348 set_stat_task_restart_barrier(2);
1351 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1353 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1354 set_stat_task_restart_barrier(5);
1356 free(stat_item_values[SI_basename]);
1357 stat_item_values[SI_basename] = para_strdup(
1358 "no connection to para_server");
1359 stat_client_write_item(SI_basename);
1360 st->last_status_read = *now;
1362 start_stop_decoders();
1366 static void init_status_task(struct status_task *st)
1368 memset(st, 0, sizeof(struct status_task));
1369 st->sa_time_diff_sign = 1;
1370 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1371 st->current_audio_format_num = -1;
1372 st->btrn = btr_new_node(&(struct btr_node_description)
1373 EMBRACE(.name = "stat"));
1375 stat_task->task = task_register(&(struct task_info) {
1377 .pre_select = status_pre_select,
1378 .post_select = status_post_select,
1379 .context = stat_task,
1383 static void set_initial_status(void)
1385 audiod_status = AUDIOD_ON;
1386 if (!OPT_GIVEN(MODE))
1388 if (!strcmp(OPT_STRING_VAL(MODE), "sb")) {
1389 audiod_status = AUDIOD_STANDBY;
1392 if (!strcmp(OPT_STRING_VAL(MODE), "off")) {
1393 audiod_status = AUDIOD_OFF;
1396 if (strcmp(OPT_STRING_VAL(MODE), "on"))
1397 PARA_WARNING_LOG("invalid mode\n");
1401 * Lookup the given UID in the whitelist.
1403 * The whitelist is the array of arguments to the --user-allow opion. If the
1404 * option was not given, the array is empty, in which case the check succeeds.
1406 * \param uid User ID to look up.
1408 * \return True if --user-allow was not given, or if uid matches an element of
1411 bool uid_is_whitelisted(uid_t uid)
1415 if (!OPT_GIVEN(USER_ALLOW))
1417 for (i = 0; i < OPT_GIVEN(USER_ALLOW); i++)
1418 if (uid == uid_whitelist[i])
1423 static void handle_help_flags(void)
1426 bool d = OPT_GIVEN(DETAILED_HELP);
1429 help = lls_long_help(CMD_PTR);
1430 else if (OPT_GIVEN(HELP))
1431 help = lls_short_help(CMD_PTR);
1434 printf("%s\n", help);
1436 print_receiver_helps(d);
1437 print_filter_helps(d);
1438 print_writer_helps(d);
1443 * the main function of para_audiod
1445 * \param argc usual argument count
1446 * \param argv usual argument vector
1448 * \return EXIT_SUCCESS or EXIT_FAILURE
1450 * \sa para_audiod(1)
1452 int main(int argc, char *argv[])
1455 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1459 ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
1462 daemon_set_loglevel(ENUM_STRING_VAL(LOGLEVEL));
1463 daemon_drop_privileges_or_die(OPT_STRING_VAL(USER),
1464 OPT_STRING_VAL(GROUP));
1465 version_handle_flag("audiod", OPT_GIVEN(VERSION));
1466 handle_help_flags();
1467 parse_config_or_die();
1469 daemon_set_priority(OPT_UINT32_VAL(PRIORITY));
1470 if (daemon_init_colors_or_die(OPT_UINT32_VAL(COLOR), COLOR_AUTO,
1471 COLOR_NO, OPT_GIVEN(LOGFILE))) {
1472 for (i = 0; i < OPT_GIVEN(LOG_COLOR); i++)
1473 daemon_set_log_color_or_die(lls_string_val(i,
1474 OPT_RESULT(LOG_COLOR)));
1476 daemon_set_flag(DF_LOG_TIME);
1477 daemon_set_flag(DF_LOG_HOSTNAME);
1478 daemon_set_flag(DF_LOG_LL);
1479 if (OPT_GIVEN(LOG_TIMING))
1480 daemon_set_flag(DF_LOG_TIMING);
1481 if (OPT_GIVEN(LOGFILE)) {
1482 daemon_set_logfile(OPT_STRING_VAL(LOGFILE));
1483 daemon_open_log_or_die();
1485 ret = parse_stream_args();
1487 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1490 daemon_log_welcome("audiod");
1491 daemon_set_start_time();
1492 set_initial_status();
1495 setup_signal_handling();
1497 init_status_task(stat_task);
1498 init_command_task(cmd_task);
1500 if (OPT_GIVEN(DAEMON))
1501 daemonize(false /* parent exits immediately */);
1503 signal_task->task = task_register(&(struct task_info) {
1505 .pre_select = signal_pre_select,
1506 .post_select = signal_post_select,
1507 .context = signal_task,
1510 sched.default_timeout.tv_sec = 2;
1511 sched.default_timeout.tv_usec = 999 * 1000;
1512 ret = schedule(&sched);
1514 sched_shutdown(&sched);
1515 signal_shutdown(signal_task);
1518 lls_free_parse_result(lpr, CMD_PTR);
1520 PARA_ERROR_LOG("%s\n", errctx);
1522 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1523 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;