Improve signal init and shutdown.
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c The paraslash's audio daemon. */
8
9 #include <netinet/in.h>
10 #include <sys/socket.h>
11 #include <regex.h>
12 #include <sys/types.h>
13 #include <arpa/inet.h>
14 #include <sys/un.h>
15 #include <netdb.h>
16 #include <signal.h>
17
18 #include "para.h"
19 #include "error.h"
20 #include "crypt.h"
21 #include "audiod.cmdline.h"
22 #include "list.h"
23 #include "sched.h"
24 #include "ggo.h"
25 #include "buffer_tree.h"
26 #include "recv.h"
27 #include "filter.h"
28 #include "grab_client.h"
29 #include "client.cmdline.h"
30 #include "client.h"
31 #include "audiod.h"
32 #include "net.h"
33 #include "daemon.h"
34 #include "string.h"
35 #include "fd.h"
36 #include "write.h"
37 #include "write_common.h"
38 #include "signal.h"
39 #include "version.h"
40
41 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
42 /** define the array of error lists needed by para_audiod */
43 INIT_AUDIOD_ERRLISTS;
44 /** define the array containing all supported audio formats */
45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
46
47 DEFINE_RECEIVER_ARRAY;
48
49 /** Defines how audiod handles one supported audio format. */
50 struct audio_format_info {
51 /** pointer to the receiver for this audio format */
52 struct receiver *receiver;
53 /** the receiver configuration */
54 void *receiver_conf;
55 /** the number of filters that should be activated for this audio format */
56 unsigned int num_filters;
57 /** Array of filter numbers to be activated. */
58 unsigned *filter_nums;
59 /** Pointer to the array of filter configurations. */
60 void **filter_conf;
61 /** the number of filters that should be activated for this audio format */
62 unsigned int num_writers;
63 /** Array of writer numbers to be activated. */
64 int *writer_nums;
65 /** pointer to the array of writer configurations */
66 void **writer_conf;
67 /** do not start receiver/filters/writer before this time */
68 struct timeval restart_barrier;
69 };
70
71 /**
72 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
73 * be associated with a receiver/filter/writer triple. This array holds all
74 * information on the status of these slots.
75 *
76 * \sa struct slot_info
77 * */
78 struct slot_info slot[MAX_STREAM_SLOTS];
79
80 /** The vss status flags audiod is interested in. */
81 enum vss_status_flags {
82 /** Whether the 'N' flag is set. */
83 VSS_STATUS_FLAG_NEXT = 1,
84 /** The 'P' flag is set. */
85 VSS_STATUS_FLAG_PLAYING = 2,
86 };
87
88 /**
89 * The scheduler instance of para_audiod.
90 *
91 * This is needed also in audiod_command.c (for the tasks command), so it can
92 * not be made static.
93 */
94 struct sched sched = {.max_fileno = 0};
95
96 /* The task for obtaining para_server's status (para_client stat). */
97 struct status_task {
98 /** The associated task structure of audiod. */
99 struct task *task;
100 /** Client data associated with the stat task. */
101 struct client_task *ct;
102 /** Do not restart client command until this time. */
103 struct timeval restart_barrier;
104 /** Last time we received status data from para_server. */
105 struct timeval last_status_read;
106 size_t min_iqs;
107 /** The offset value announced by para_server. */
108 int offset_seconds;
109 /** The length of the current audio file as announced by para_server. */
110 int length_seconds;
111 /** The start of the current stream from the view of para_server. */
112 struct timeval server_stream_start;
113 /** The average time deviation between para_server and para_audiod. */
114 struct timeval sa_time_diff;
115 /** Whether client time is ahead of server time. */
116 int sa_time_diff_sign;
117 /** The 'P' and the 'N' flags as announced by para_server. */
118 enum vss_status_flags vss_status;
119 /** Number of times the clock difference is to be checked. */
120 unsigned clock_diff_count;
121 /** When to start the next check for clock difference. */
122 struct timeval clock_diff_barrier;
123 /** Number of the audio format as announced by para_server. */
124 int current_audio_format_num;
125 /* The status task btrn is the child of the client task. */
126 struct btr_node *btrn;
127 };
128
129 /** The array of status items sent by para_server. */
130 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
131
132 /**
133 * the current mode of operation of which can be changed by the on/off/cycle
134 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
135 */
136 int audiod_status = AUDIOD_ON;
137
138 /**
139 * the gengetopt args_info struct that holds information on all command line
140 * arguments
141 */
142 struct audiod_args_info conf;
143
144 static char *socket_name;
145 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
146
147 static struct signal_task *signal_task;
148
149 static struct status_task status_task_struct;
150
151 /**
152 * the task that calls the status command of para_server
153 *
154 * \sa struct status_task
155 */
156 static struct status_task *stat_task = &status_task_struct;
157
158 /**
159 * the task for handling audiod commands
160 *
161 * \sa struct task, struct sched
162 */
163 struct command_task {
164 /** the local listening socket */
165 int fd;
166 /** the associated task structure */
167 struct task *task;
168 };
169
170 /** iterate over all supported audio formats */
171 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
172
173 /**
174 * Get the audio format number.
175 *
176 * \param name The name of the audio format.
177 *
178 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
179 * \a name is not a supported audio format.
180 */
181 static int get_audio_format_num(const char *name)
182 {
183 int i;
184
185 while (para_isspace(*name))
186 name++;
187 FOR_EACH_AUDIO_FORMAT(i)
188 if (!strcmp(name, audio_formats[i]))
189 return i;
190 return -E_UNSUPPORTED_AUDIO_FORMAT;
191 }
192
193 static int get_matching_audio_format_nums(const char *re)
194 {
195 int i, ret;
196 regex_t preg;
197
198 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
199 if (ret < 0)
200 return ret;
201 ret = 0;
202 FOR_EACH_AUDIO_FORMAT(i)
203 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
204 ret |= (1 << i);
205 regfree(&preg);
206 return ret;
207 }
208
209 /**
210 * Compute the play time based on information of the given slot.
211 *
212 * \param slot_num The slot number (negative means: no slot).
213 *
214 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
215 * from the status items received from para_server and the start time of the
216 * (first) writer of the given slot.
217 *
218 * It has to take into account that the stream was probably not started at
219 * the beginning of the file, that the clock between the server and the client
220 * host may differ and that playback of the stream was delayed, e.g. because
221 * the prebuffer filter is used in the filter configuration of the given slot.
222 *
223 * If no writer is active in the given slot, or \a slot_num is negative
224 * (indicating that para_audiod runs in standby mode), an approximation based
225 * only on the status items is computed and the returned string is prefixed
226 * with "~".
227 *
228 * \return A string that must be freed by the caller.
229 */
230 char *get_time_string(int slot_num)
231 {
232 int ret, seconds = 0, length;
233 struct timeval *tmp, sum, sss, /* server stream start */
234 rstime, /* receiver start time */
235 wstime, /* writer start time */
236 wtime, /* now - writer start */
237 rskip; /* receiver start - sss */
238 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
239 char *msg;
240
241 if (audiod_status == AUDIOD_OFF)
242 goto empty;
243 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
244 if (stat_task->length_seconds) /* paused */
245 return NULL;
246 goto empty; /* stopped */
247 }
248 if (audiod_status == AUDIOD_ON && !s)
249 goto empty;
250 /*
251 * Valid status items and playing, set length and tmp to the stream
252 * start. We use the slot info and fall back to the info from current
253 * status items if no slot info is available.
254 */
255 length = stat_task->length_seconds;
256 tmp = &stat_task->server_stream_start;
257 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
258 btr_get_node_start(s->wns[0].btrn, &wstime);
259 if (wstime.tv_sec != 0) { /* writer wrote something */
260 if (s->server_stream_start.tv_sec == 0) {
261 /* copy status info to slot */
262 s->server_stream_start = stat_task->server_stream_start;
263 s->offset_seconds = stat_task->offset_seconds;
264 s->seconds_total = stat_task->length_seconds;
265 }
266 length = s->seconds_total;
267 tmp = &s->server_stream_start;
268 }
269 }
270 if (stat_task->sa_time_diff_sign > 0)
271 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
272 else
273 tv_add(tmp, &stat_task->sa_time_diff, &sss);
274 if (!s || !s->wns || !s->wns[0].btrn) {
275 struct timeval diff;
276 tv_diff(now, &sss, &diff);
277 seconds = diff.tv_sec + stat_task->offset_seconds;
278 goto out;
279 }
280 tv_diff(now, &wstime, &wtime);
281 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
282 seconds = s->offset_seconds;
283 if (s->receiver_node->btrn) {
284 btr_get_node_start(s->receiver_node->btrn, &rstime);
285 ret = tv_diff(&rstime, &sss, &rskip);
286 if (ret > 0) { /* audiod was started in the middle of the stream */
287 tv_add(&wtime, &rskip, &sum);
288 seconds += sum.tv_sec;
289 } else
290 seconds += wtime.tv_sec;
291 } else
292 seconds += wtime.tv_sec;
293 out:
294 seconds = PARA_MIN(seconds, length);
295 seconds = PARA_MAX(seconds, 0);
296 msg = make_message(
297 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
298 s? "" : "~",
299 seconds / 60,
300 seconds % 60,
301 (length - seconds) / 60,
302 (length - seconds) % 60,
303 length? (seconds * 100 + length / 2) / length : 0,
304 length / 60,
305 length % 60
306 );
307 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
308 return msg;
309 empty:
310 return para_strdup(NULL);
311 }
312
313 static void parse_config_or_die(void)
314 {
315 int ret;
316 char *config_file;
317 struct audiod_cmdline_parser_params params = {
318 .override = 0,
319 .initialize = 0,
320 .check_required = 1,
321 .check_ambiguity = 0,
322 .print_errors = 1
323 };
324
325 if (conf.config_file_given)
326 config_file = para_strdup(conf.config_file_arg);
327 else {
328 char *home = para_homedir();
329 config_file = make_message("%s/.paraslash/audiod.conf", home);
330 free(home);
331 }
332 ret = file_exists(config_file);
333 if (conf.config_file_given && !ret) {
334 PARA_EMERG_LOG("can not read config file %s\n", config_file);
335 goto err;
336 }
337 if (ret) {
338 audiod_cmdline_parser_config_file(config_file, &conf, &params);
339 daemon_set_loglevel(conf.loglevel_arg);
340 }
341 free(config_file);
342 return;
343 err:
344 free(config_file);
345 exit(EXIT_FAILURE);
346 }
347
348 static void setup_signal_handling(void)
349 {
350 signal_task = signal_init_or_die();
351 para_install_sighandler(SIGINT);
352 para_install_sighandler(SIGTERM);
353 para_install_sighandler(SIGHUP);
354 para_sigaction(SIGPIPE, SIG_IGN);
355 }
356
357 static void clear_slot(int slot_num)
358 {
359 struct slot_info *s = &slot[slot_num];
360
361 PARA_INFO_LOG("clearing slot %d\n", slot_num);
362 memset(s, 0, sizeof(struct slot_info));
363 s->format = -1;
364 }
365
366 static void close_receiver(int slot_num)
367 {
368 struct slot_info *s = &slot[slot_num];
369 struct audio_format_info *a;
370
371 if (s->format < 0 || !s->receiver_node)
372 return;
373 a = &afi[s->format];
374 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
375 audio_formats[s->format], slot_num);
376 a->receiver->close(s->receiver_node);
377 btr_remove_node(&s->receiver_node->btrn);
378 task_reap(&s->receiver_node->task);
379 free(s->receiver_node);
380 s->receiver_node = NULL;
381 stat_task->current_audio_format_num = -1;
382 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
383 &a->restart_barrier);
384 }
385
386 static void writer_cleanup(struct writer_node *wn)
387 {
388 struct writer *w;
389
390 if (!wn)
391 return;
392 w = writers + wn->writer_num;
393 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
394 w->close(wn);
395 btr_remove_node(&wn->btrn);
396 task_reap(&wn->task);
397 }
398
399 static void close_writers(struct slot_info *s)
400 {
401 struct audio_format_info *a;
402 int i;
403
404 if (s->format < 0)
405 return;
406 assert(s->wns);
407 a = afi + s->format;
408 if (a->num_writers == 0)
409 writer_cleanup(s->wns);
410 else {
411 for (i = 0; i < a->num_writers; i++)
412 writer_cleanup(s->wns + i);
413 }
414 free(s->wns);
415 s->wns = NULL;
416 }
417
418 static void close_filters(struct slot_info *s)
419 {
420 int i;
421 struct audio_format_info *a = afi + s->format;
422 if (a->num_filters == 0)
423 return;
424 for (i = a->num_filters - 1; i >= 0; i--) {
425 struct filter_node *fn = s->fns + i;
426 struct filter *f;
427
428 if (!fn)
429 continue;
430 f = filters + fn->filter_num;
431 if (f->close)
432 f->close(fn);
433 btr_remove_node(&fn->btrn);
434 task_reap(&fn->task);
435 }
436 free(s->fns);
437 s->fns = NULL;
438 }
439
440 static void notify_receivers(int error)
441 {
442 int i;
443
444 FOR_EACH_SLOT(i) {
445 struct slot_info *s = slot + i;
446 if (s->format < 0)
447 continue;
448 if (!s->receiver_node)
449 continue;
450 task_notify(s->receiver_node->task, error);
451 }
452 }
453
454 static int get_empty_slot(void)
455 {
456 int i;
457 struct slot_info *s;
458
459 FOR_EACH_SLOT(i) {
460 s = &slot[i];
461 if (s->format < 0) {
462 clear_slot(i);
463 return i;
464 }
465 if (s->wns || s->receiver_node || s->fns)
466 continue;
467 clear_slot(i);
468 return i;
469 }
470 return -E_NO_MORE_SLOTS;
471 }
472
473 static void open_filters(struct slot_info *s)
474 {
475 struct audio_format_info *a = afi + s->format;
476 struct filter_node *fn;
477 int nf = a->num_filters;
478 struct btr_node *parent;
479 int i;
480
481 if (nf == 0)
482 return;
483 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
484 assert(s->fns == NULL);
485 s->fns = para_calloc(nf * sizeof(struct filter_node));
486 parent = s->receiver_node->btrn;
487 for (i = 0; i < nf; i++) {
488 char buf[20];
489 struct filter *f = filters + a->filter_nums[i];
490 fn = s->fns + i;
491 fn->filter_num = a->filter_nums[i];
492 fn->conf = a->filter_conf[i];
493 fn->btrn = btr_new_node(&(struct btr_node_description)
494 EMBRACE(.name = f->name, .parent = parent,
495 .handler = f->execute, .context = fn));
496
497 f->open(fn);
498 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
499 fn->task = task_register(&(struct task_info) {
500 .name = buf,
501 .pre_select = f->pre_select,
502 .post_select = f->post_select,
503 .context = fn,
504 }, &sched);
505 parent = fn->btrn;
506 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
507 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
508 }
509 }
510
511 static void open_writers(struct slot_info *s)
512 {
513 int i;
514 struct audio_format_info *a = afi + s->format;
515 struct writer_node *wn;
516 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
517
518 assert(s->wns == NULL);
519 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
520 * sizeof(struct writer_node));
521 for (i = 0; i < a->num_writers; i++) {
522 wn = s->wns + i;
523 wn->conf = a->writer_conf[i];
524 wn->writer_num = a->writer_nums[i];
525 register_writer_node(wn, parent, &sched);
526 PARA_NOTICE_LOG("%s writer started in slot %d\n",
527 writer_names[a->writer_nums[i]], (int)(s - slot));
528 }
529 }
530
531 /* returns slot num on success */
532 static int open_receiver(int format)
533 {
534 struct audio_format_info *a = &afi[format];
535 struct slot_info *s;
536 int ret, slot_num;
537 struct receiver *r = a->receiver;
538 struct receiver_node *rn;
539
540 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
541 ret = get_empty_slot();
542 if (ret < 0)
543 return ret;
544 slot_num = ret;
545 rn = para_calloc(sizeof(*rn));
546 rn->receiver = r;
547 rn->conf = a->receiver_conf;
548 rn->btrn = btr_new_node(&(struct btr_node_description)
549 EMBRACE(.name = r->name, .context = rn));
550 ret = r->open(rn);
551 if (ret < 0) {
552 btr_remove_node(&rn->btrn);
553 free(rn);
554 return ret;
555 }
556 s = &slot[slot_num];
557 s->format = format;
558 s->receiver_node = rn;
559 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
560 audio_formats[format], r->name, slot_num);
561 rn->task = task_register(&(struct task_info) {
562 .name = r->name,
563 .pre_select = r->pre_select,
564 .post_select = r->post_select,
565 .context = rn,
566 }, &sched);
567 return slot_num;
568 }
569
570 static bool receiver_running(void)
571 {
572 int i;
573 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
574
575 FOR_EACH_SLOT(i) {
576 struct slot_info *s = &slot[i];
577 long unsigned ss2 = s->server_stream_start.tv_sec;
578
579 if (!s->receiver_node)
580 continue;
581 if (task_status(s->receiver_node->task) >= 0)
582 return true;
583 if (ss1 == ss2)
584 return true;
585 }
586 return false;
587 }
588
589 /**
590 * Return the root node of the current buffer tree.
591 *
592 * This is only used for stream grabbing.
593 *
594 * \return \p NULL if no slot is currently active. If more than one buffer tree
595 * exists, the node corresponding to the most recently started receiver is
596 * returned.
597 */
598 struct btr_node *audiod_get_btr_root(void)
599 {
600 int i, newest_slot = -1;
601 struct timeval newest_rstime = {0, 0};
602
603 FOR_EACH_SLOT(i) {
604 struct slot_info *s = &slot[i];
605 struct timeval rstime;
606 if (!s->receiver_node)
607 continue;
608 if (task_status(s->receiver_node->task) < 0)
609 continue;
610 btr_get_node_start(s->receiver_node->btrn, &rstime);
611 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
612 continue;
613 newest_rstime = rstime;
614 newest_slot = i;
615 }
616 if (newest_slot == -1)
617 return NULL;
618 return slot[newest_slot].receiver_node->btrn;
619 }
620
621 /* whether a new instance of a decoder should be started. */
622 static bool must_start_decoder(void)
623 {
624 int cafn = stat_task->current_audio_format_num;
625 unsigned vs = stat_task->vss_status;
626
627 if (audiod_status != AUDIOD_ON)
628 return false;
629 if (cafn < 0)
630 return false;
631 if (!stat_task->ct)
632 return false;
633 if (vs & VSS_STATUS_FLAG_NEXT)
634 return false;
635 if (!(vs & VSS_STATUS_FLAG_PLAYING))
636 return false;
637 if (receiver_running())
638 return false;
639 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
640 return false;
641 return true;
642 }
643
644 static void compute_time_diff(const struct timeval *status_time)
645 {
646 struct timeval tmp, diff;
647 static unsigned count;
648 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
649 const struct timeval max_deviation = {0, 500 * 1000};
650 const int time_smooth = 5;
651
652 sign = tv_diff(status_time, now, &diff);
653 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
654 // sign, sa_time_diff_sign);
655 if (!count) {
656 sa_time_diff_sign = sign;
657 stat_task->sa_time_diff = diff;
658 count++;
659 goto out;
660 }
661 if (count > 5) {
662 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
663 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
664 PARA_WARNING_LOG("time diff jump: %lims\n",
665 s * tv2ms(&tmp));
666 }
667 count++;
668 sa_time_diff_sign = tv_convex_combination(
669 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
670 count > 10? sign : sign * time_smooth, &diff,
671 &tmp);
672 stat_task->sa_time_diff = tmp;
673 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
674 sign < 0? "-" : "+",
675 tv2ms(&diff),
676 sa_time_diff_sign < 0? "-" : "+",
677 tv2ms(&stat_task->sa_time_diff)
678 );
679 out:
680 stat_task->sa_time_diff_sign = sa_time_diff_sign;
681 }
682
683 static int update_item(int itemnum, char *buf)
684 {
685 long unsigned sec, usec;
686
687 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
688 return 1;
689 free(stat_item_values[itemnum]);
690 stat_item_values[itemnum] = para_strdup(buf);
691 stat_client_write_item(itemnum);
692 switch (itemnum) {
693 case SI_STATUS_FLAGS:
694 stat_task->vss_status = 0;
695 if (strchr(buf, 'N'))
696 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
697 if (strchr(buf, 'P'))
698 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
699 break;
700 case SI_OFFSET:
701 stat_task->offset_seconds = atoi(buf);
702 break;
703 case SI_SECONDS_TOTAL:
704 stat_task->length_seconds = atoi(buf);
705 break;
706 case SI_STREAM_START:
707 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
708 stat_task->server_stream_start.tv_sec = sec;
709 stat_task->server_stream_start.tv_usec = usec;
710 }
711 break;
712 case SI_CURRENT_TIME:
713 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
714 struct timeval tv = {sec, usec};
715 compute_time_diff(&tv);
716 }
717 break;
718 case SI_FORMAT:
719 stat_task->current_audio_format_num
720 = get_audio_format_num(buf);
721 }
722 return 1;
723 }
724
725 static int parse_stream_command(const char *txt, char **cmd)
726 {
727 int ret, len;
728 char *re, *p = strchr(txt, ':');
729
730 if (!p)
731 return -E_MISSING_COLON;
732 *cmd = p + 1;
733 len = p - txt;
734 re = malloc(len + 1);
735 strncpy(re, txt, len);
736 re[len] = '\0';
737 ret = get_matching_audio_format_nums(re);
738 free(re);
739 return ret;
740 }
741
742 static int add_filter(int format, char *cmdline)
743 {
744 struct audio_format_info *a = &afi[format];
745 int filter_num, nf = a->num_filters;
746 void *cfg;
747
748 filter_num = check_filter_arg(cmdline, &cfg);
749 if (filter_num < 0)
750 return filter_num;
751 a->filter_conf = para_realloc(a->filter_conf,
752 (nf + 1) * sizeof(void *));
753 a->filter_nums = para_realloc(a->filter_nums,
754 (nf + 1) * sizeof(unsigned));
755 a->filter_nums[nf] = filter_num;
756 a->filter_conf[nf] = cfg;
757 a->num_filters++;
758 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
759 filters[filter_num].name);
760 return filter_num;
761 }
762
763 static int parse_writer_args(void)
764 {
765 int i, ret;
766 char *cmd;
767 struct audio_format_info *a;
768
769 for (i = 0; i < conf.writer_given; i++) {
770 void *wconf;
771 int j, nw, writer_num, af_mask;
772
773 ret = parse_stream_command(conf.writer_arg[i], &cmd);
774 if (ret < 0)
775 return ret;
776 af_mask = ret;
777 FOR_EACH_AUDIO_FORMAT(j) {
778 a = afi + j;
779 if ((af_mask & (1 << j)) == 0) /* no match */
780 continue;
781 wconf = check_writer_arg_or_die(cmd, &writer_num);
782 nw = a->num_writers;
783 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
784 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
785 a->writer_nums[nw] = writer_num;
786 a->writer_conf[nw] = wconf;
787 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
788 nw, writer_names[writer_num]);
789 a->num_writers++;
790 }
791 }
792 /* Use default writer for audio formats which are not yet set up. */
793 FOR_EACH_AUDIO_FORMAT(i) {
794 void *writer_conf;
795 int writer_num;
796 a = afi + i;
797 if (a->num_writers > 0)
798 continue; /* already set up */
799 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
800 a->writer_nums = para_malloc(sizeof(int));
801 a->writer_nums[0] = writer_num;
802 a->writer_conf = para_malloc(sizeof(void *));
803 a->writer_conf[0] = writer_conf;
804 a->num_writers = 1;
805 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
806 writer_names[writer_num]);
807 }
808 return 1;
809 }
810
811 static int parse_receiver_args(void)
812 {
813 int i, ret, receiver_num;
814 char *cmd = NULL;
815 struct audio_format_info *a;
816
817 for (i = conf.receiver_given - 1; i >= 0; i--) {
818 char *arg;
819 int j, af_mask;
820
821 ret = parse_stream_command(conf.receiver_arg[i], &arg);
822 if (ret < 0)
823 goto out;
824 af_mask = ret;
825 FOR_EACH_AUDIO_FORMAT(j) {
826 a = afi + j;
827 if ((af_mask & (1 << j)) == 0) /* no match */
828 continue;
829 /*
830 * If multiple receivers are given for this audio format, the
831 * last one wins and we have to free the previous receiver
832 * config here. Since we are iterating backwards, the winning
833 * receiver arg is in fact the first one given.
834 */
835 if (a->receiver_conf)
836 a->receiver->free_config(a->receiver_conf);
837 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
838 ret = -E_RECV_SYNTAX;
839 if (!a->receiver_conf)
840 goto out;
841 a->receiver = receivers + receiver_num;
842 }
843 }
844 /*
845 * Use the first available receiver with no arguments for those audio
846 * formats for which no receiver was specified.
847 */
848 cmd = para_strdup(receivers[0].name);
849 FOR_EACH_AUDIO_FORMAT(i) {
850 a = &afi[i];
851 if (a->receiver_conf)
852 continue;
853 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
854 if (!a->receiver_conf)
855 return -E_RECV_SYNTAX;
856 a->receiver = &receivers[receiver_num];
857 }
858 FOR_EACH_AUDIO_FORMAT(i) {
859 a = afi + i;
860 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
861 audio_formats[i], a->receiver->name);
862 }
863 ret = 1;
864 out:
865 free(cmd);
866 return ret;
867 }
868
869 static int init_default_filters(void)
870 {
871 int i, ret = 1;
872
873 FOR_EACH_AUDIO_FORMAT(i) {
874 struct audio_format_info *a = &afi[i];
875 char *tmp;
876 int j;
877
878 if (a->num_filters)
879 continue; /* no default -- nothing to to */
880 /*
881 * udp and dccp streams are fec-encoded, so add fecdec as the
882 * first filter.
883 */
884 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
885 strcmp(afi[i].receiver->name, "dccp") == 0) {
886 tmp = para_strdup("fecdec");
887 add_filter(i, tmp);
888 free(tmp);
889 if (ret < 0)
890 goto out;
891 }
892 /* add "dec" to audio format name */
893 tmp = make_message("%sdec", audio_formats[i]);
894 for (j = 0; filters[j].name; j++)
895 if (!strcmp(tmp, filters[j].name))
896 break;
897 free(tmp);
898 ret = -E_UNSUPPORTED_FILTER;
899 if (!filters[j].name)
900 goto out;
901 tmp = para_strdup(filters[j].name);
902 ret = add_filter(i, tmp);
903 free(tmp);
904 if (ret < 0)
905 goto out;
906 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
907 filters[j].name);
908 }
909 out:
910 return ret;
911 }
912
913 static int parse_filter_args(void)
914 {
915 int i, j, ret, af_mask, num_matches;
916
917 for (i = 0; i < conf.filter_given; i++) {
918 char *arg;
919 ret = parse_stream_command(conf.filter_arg[i], &arg);
920 if (ret < 0)
921 goto out;
922 af_mask = ret;
923 num_matches = 0;
924 FOR_EACH_AUDIO_FORMAT(j) {
925 if ((af_mask & (1 << j)) == 0) /* no match */
926 continue;
927 ret = add_filter(j, arg);
928 if (ret < 0)
929 goto out;
930 num_matches++;
931 }
932 if (num_matches == 0)
933 PARA_WARNING_LOG("ignoring filter spec: %s\n",
934 conf.filter_arg[i]);
935 }
936 ret = init_default_filters(); /* use default values for the rest */
937 out:
938 return ret;
939 }
940
941 static int parse_stream_args(void)
942 {
943 int ret;
944
945 ret = parse_receiver_args();
946 if (ret < 0)
947 return ret;
948 ret = parse_filter_args();
949 if (ret < 0)
950 return ret;
951 ret = parse_writer_args();
952 if (ret < 0)
953 return ret;
954 return 1;
955 }
956
957 /* does not unlink socket on errors */
958 static int audiod_get_socket(void)
959 {
960 struct sockaddr_un unix_addr;
961 int ret, fd;
962
963 if (conf.socket_given)
964 socket_name = para_strdup(conf.socket_arg);
965 else {
966 char *hn = para_hostname();
967 socket_name = make_message("/var/paraslash/audiod_socket.%s",
968 hn);
969 free(hn);
970 }
971 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
972 if (conf.force_given)
973 unlink(socket_name);
974 ret = create_local_socket(socket_name, &unix_addr,
975 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
976 if (ret < 0)
977 goto err;
978 fd = ret;
979 if (listen(fd , 5) < 0) {
980 ret = -ERRNO_TO_PARA_ERROR(errno);
981 goto err;
982 }
983 ret = mark_fd_nonblocking(fd);
984 if (ret < 0)
985 goto err;
986 return fd;
987 err:
988 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
989 exit(EXIT_FAILURE);
990 }
991
992 static int signal_post_select(struct sched *s, void *context)
993 {
994 struct signal_task *st = context;
995 int ret, signum;
996
997 ret = task_get_notification(st->task);
998 if (ret < 0)
999 return ret;
1000 signum = para_next_signal(&s->rfds);
1001 switch (signum) {
1002 case SIGINT:
1003 case SIGTERM:
1004 case SIGHUP:
1005 PARA_NOTICE_LOG("received signal %d\n", signum);
1006 task_notify_all(s, E_AUDIOD_SIGNAL);
1007 return -E_AUDIOD_SIGNAL;
1008 }
1009 return 0;
1010 }
1011
1012 static void command_pre_select(struct sched *s, void *context)
1013 {
1014 struct command_task *ct = context;
1015 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1016 }
1017
1018 static int command_post_select(struct sched *s, void *context)
1019 {
1020 int ret;
1021 struct command_task *ct = context;
1022 static struct timeval last_status_dump;
1023 struct timeval tmp, delay;
1024 bool force = true;
1025
1026 ret = task_get_notification(ct->task);
1027 if (ret < 0)
1028 return ret;
1029 ret = handle_connect(ct->fd, &s->rfds);
1030 if (ret < 0) {
1031 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1032 if (ret == -E_AUDIOD_TERM) {
1033 task_notify_all(s, -ret);
1034 return ret;
1035 }
1036 } else if (ret > 0)
1037 goto dump;
1038
1039 /* if last status dump was less than 500ms ago, do nothing */
1040 delay.tv_sec = 0;
1041 delay.tv_usec = 500 * 1000;
1042 tv_add(&last_status_dump, &delay, &tmp);
1043 if (tv_diff(now, &tmp, NULL) < 0)
1044 return 0;
1045
1046 /*
1047 * If last status dump was more than 5s ago, force update. Otherwise,
1048 * update only those items that have changed.
1049 */
1050 delay.tv_sec = 5;
1051 delay.tv_usec = 0;
1052 tv_add(&last_status_dump, &delay, &tmp);
1053 if (tv_diff(now, &tmp, NULL) < 0)
1054 force = false;
1055 dump:
1056 audiod_status_dump(force);
1057 last_status_dump = *now;
1058 return 1;
1059 }
1060
1061 static void init_command_task(struct command_task *ct)
1062 {
1063 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1064
1065 ct->task = task_register(&(struct task_info) {
1066 .name = "command",
1067 .pre_select = command_pre_select,
1068 .post_select = command_post_select,
1069 .context = ct,
1070 }, &sched);
1071 }
1072
1073 static void close_stat_pipe(void)
1074 {
1075 if (!stat_task->ct)
1076 return;
1077 task_reap(&stat_task->ct->task);
1078 client_close(stat_task->ct);
1079 stat_task->ct = NULL;
1080 clear_and_dump_items();
1081 stat_task->length_seconds = 0;
1082 stat_task->offset_seconds = 0;
1083 stat_task->vss_status = 0;
1084 stat_task->current_audio_format_num = -1;
1085 audiod_status_dump(true);
1086 }
1087
1088 /* avoid busy loop if server is down */
1089 static void set_stat_task_restart_barrier(unsigned seconds)
1090 {
1091 struct timeval delay = {seconds, 0};
1092 tv_add(now, &delay, &stat_task->restart_barrier);
1093 }
1094
1095 static bool must_close_slot(int slot_num)
1096 {
1097 struct slot_info *s = &slot[slot_num];
1098 struct audio_format_info *a = afi + s->format;
1099 int i;
1100
1101 if (s->format < 0)
1102 return false;
1103 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1104 return false;
1105 for (i = 0; i < a->num_filters; i++)
1106 if (s->fns && task_status(s->fns[i].task) >= 0)
1107 return false;
1108 if (a->num_writers > 0) {
1109 for (i = 0; i < a->num_writers; i++)
1110 if (s->wns && task_status(s->wns[i].task) >= 0)
1111 return false;
1112 } else {
1113 if (s->wns && task_status(s->wns[0].task) >= 0)
1114 return false;
1115 }
1116 return true;
1117 }
1118
1119 static void close_slot(int slot_num)
1120 {
1121 struct slot_info *s = slot + slot_num;
1122
1123 PARA_INFO_LOG("closing slot %d\n", slot_num);
1124 close_writers(s);
1125 close_filters(s);
1126 close_receiver(slot_num);
1127 clear_slot(slot_num);
1128 }
1129
1130 static void close_unused_slots(void)
1131 {
1132 int i;
1133
1134 FOR_EACH_SLOT(i)
1135 if (must_close_slot(i))
1136 close_slot(i);
1137 }
1138
1139 /*
1140 * Cleanup all resources.
1141 *
1142 * This performs various cleanups, removes the audiod socket and closes the
1143 * connection to para_server.
1144 */
1145 static void audiod_cleanup(void)
1146 {
1147 if (socket_name)
1148 unlink(socket_name);
1149 close_stat_pipe();
1150 close_unused_slots();
1151 audiod_cmdline_parser_free(&conf);
1152 close_stat_clients();
1153 }
1154
1155 /*
1156 * Check if any receivers/filters/writers need to be started and do so if
1157 * necessary.
1158 */
1159 static void start_stop_decoders(void)
1160 {
1161 int ret;
1162 struct slot_info *sl;
1163
1164 close_unused_slots();
1165 if (audiod_status != AUDIOD_ON ||
1166 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1167 return notify_receivers(E_NOT_PLAYING);
1168 if (!must_start_decoder())
1169 return;
1170 ret = open_receiver(stat_task->current_audio_format_num);
1171 if (ret < 0) {
1172 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1173 return;
1174 }
1175 sl = slot + ret;
1176 open_filters(sl);
1177 open_writers(sl);
1178 activate_grab_clients(&sched);
1179 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1180 }
1181
1182 static void status_pre_select(struct sched *s, void *context)
1183 {
1184 struct status_task *st = context;
1185 int i, ret, cafn = stat_task->current_audio_format_num;
1186
1187 if (must_start_decoder())
1188 goto min_delay;
1189 FOR_EACH_SLOT(i)
1190 if (must_close_slot(i))
1191 goto min_delay;
1192 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1193 if (ret > 0)
1194 goto min_delay;
1195 if (st->ct && audiod_status == AUDIOD_OFF)
1196 goto min_delay;
1197 if (!st->ct && audiod_status != AUDIOD_OFF)
1198 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1199 if (cafn >= 0)
1200 sched_request_barrier(&afi[cafn].restart_barrier, s);
1201 /*
1202 * If para_server is playing we'd like to have a smooth time display
1203 * even if we are running in standby mode. So we request a timeout that
1204 * expires at the next full second.
1205 */
1206 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1207 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1208 return;
1209 min_delay:
1210 sched_min_delay(s);
1211 }
1212
1213 /* restart the client task if necessary */
1214 static int status_post_select(struct sched *s, void *context)
1215 {
1216 struct status_task *st = context;
1217 int ret;
1218
1219 ret = task_get_notification(st->task);
1220 if (ret < 0)
1221 return ret;
1222 if (audiod_status == AUDIOD_OFF) {
1223 if (!st->ct)
1224 goto out;
1225 if (task_status(st->ct->task) >= 0) {
1226 task_notify(st->ct->task, E_AUDIOD_OFF);
1227 goto out;
1228 }
1229 close_stat_pipe();
1230 st->clock_diff_count = conf.clock_diff_count_arg;
1231 goto out;
1232 }
1233 if (st->ct) {
1234 char *buf;
1235 size_t sz;
1236
1237 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1238 if (ret < 0) {
1239 close_stat_pipe();
1240 goto out;
1241 }
1242 if (st->ct->status != CL_EXECUTING)
1243 goto out;
1244 if (ret == 0) {
1245 struct timeval diff;
1246 tv_diff(now, &st->last_status_read, &diff);
1247 if (diff.tv_sec > 61)
1248 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1249 goto out;
1250 }
1251 btr_merge(st->btrn, st->min_iqs);
1252 sz = btr_next_buffer(st->btrn, &buf);
1253 ret = for_each_stat_item(buf, sz, update_item);
1254 if (ret < 0) {
1255 task_notify(st->ct->task, -ret);
1256 goto out;
1257 }
1258 if (sz != ret) {
1259 btr_consume(st->btrn, sz - ret);
1260 st->last_status_read = *now;
1261 st->min_iqs = 0;
1262 } else /* current status item crosses buffers */
1263 st->min_iqs = sz + 1;
1264 goto out;
1265 }
1266 btr_drain(st->btrn);
1267 st->current_audio_format_num = -1;
1268 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1269 goto out;
1270 if (st->clock_diff_count) { /* get status only one time */
1271 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1272 int argc = 5;
1273 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1274 st->clock_diff_count--;
1275 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1276 set_stat_task_restart_barrier(2);
1277
1278 } else {
1279 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1280 int argc = 4;
1281 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1282 set_stat_task_restart_barrier(5);
1283 }
1284 free(stat_item_values[SI_BASENAME]);
1285 stat_item_values[SI_BASENAME] = para_strdup(
1286 "no connection to para_server");
1287 stat_client_write_item(SI_BASENAME);
1288 st->last_status_read = *now;
1289 out:
1290 start_stop_decoders();
1291 return 0;
1292 }
1293
1294 static void init_status_task(struct status_task *st)
1295 {
1296 memset(st, 0, sizeof(struct status_task));
1297 st->sa_time_diff_sign = 1;
1298 st->clock_diff_count = conf.clock_diff_count_arg;
1299 st->current_audio_format_num = -1;
1300 st->btrn = btr_new_node(&(struct btr_node_description)
1301 EMBRACE(.name = "stat"));
1302
1303 stat_task->task = task_register(&(struct task_info) {
1304 .name = "stat",
1305 .pre_select = status_pre_select,
1306 .post_select = status_post_select,
1307 .context = stat_task,
1308 }, &sched);
1309 }
1310
1311 static void set_initial_status(void)
1312 {
1313 audiod_status = AUDIOD_ON;
1314 if (!conf.mode_given)
1315 return;
1316 if (!strcmp(conf.mode_arg, "sb")) {
1317 audiod_status = AUDIOD_STANDBY;
1318 return;
1319 }
1320 if (!strcmp(conf.mode_arg, "off")) {
1321 audiod_status = AUDIOD_OFF;
1322 return;
1323 }
1324 if (strcmp(conf.mode_arg, "on"))
1325 PARA_WARNING_LOG("invalid mode\n");
1326 }
1327
1328 __noreturn static void print_help_and_die(void)
1329 {
1330 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1331 bool d = conf.detailed_help_given;
1332 unsigned flags;
1333
1334 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1335 ggo_print_help(&h, flags);
1336
1337 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1338 print_receiver_helps(flags);
1339 print_filter_helps(flags);
1340 print_writer_helps(flags);
1341 exit(0);
1342 }
1343
1344 /**
1345 * the main function of para_audiod
1346 *
1347 * \param argc usual argument count
1348 * \param argv usual argument vector
1349 *
1350 * \return EXIT_SUCCESS or EXIT_FAILURE
1351 *
1352 * \sa para_audiod(1)
1353 * */
1354 int main(int argc, char *argv[])
1355 {
1356 int ret, i;
1357 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1358 struct audiod_cmdline_parser_params params = {
1359 .override = 0,
1360 .initialize = 1,
1361 .check_required = 0,
1362 .check_ambiguity = 0,
1363 .print_errors = 1
1364 };
1365
1366 valid_fd_012();
1367 audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1368 daemon_set_loglevel(conf.loglevel_arg);
1369 version_handle_flag("audiod", conf.version_given);
1370 /* init receivers/filters/writers early to make help work */
1371 recv_init();
1372 filter_init();
1373 writer_init();
1374 if (conf.help_given || conf.detailed_help_given)
1375 print_help_and_die();
1376 daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1377 parse_config_or_die();
1378 daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1379 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1380 init_random_seed_or_die();
1381 daemon_set_flag(DF_LOG_TIME);
1382 daemon_set_flag(DF_LOG_HOSTNAME);
1383 daemon_set_flag(DF_LOG_LL);
1384 if (conf.log_timing_given)
1385 daemon_set_flag(DF_LOG_TIMING);
1386 if (conf.logfile_given) {
1387 daemon_set_logfile(conf.logfile_arg);
1388 daemon_open_log_or_die();
1389 }
1390 ret = parse_stream_args();
1391 if (ret < 0) {
1392 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1393 exit(EXIT_FAILURE);
1394 }
1395 daemon_log_welcome("para_audiod");
1396 daemon_set_start_time();
1397 set_initial_status();
1398 FOR_EACH_SLOT(i)
1399 clear_slot(i);
1400 setup_signal_handling();
1401
1402 init_status_task(stat_task);
1403 init_command_task(cmd_task);
1404
1405 if (conf.daemon_given)
1406 daemonize(false /* parent exits immediately */);
1407
1408 signal_task->task = task_register(&(struct task_info) {
1409 .name = "signal",
1410 .pre_select = signal_pre_select,
1411 .post_select = signal_post_select,
1412 .context = signal_task,
1413 }, &sched);
1414
1415 sched.default_timeout.tv_sec = 2;
1416 sched.default_timeout.tv_usec = 999 * 1000;
1417 ret = schedule(&sched);
1418 audiod_cleanup();
1419 sched_shutdown(&sched);
1420 signal_shutdown(signal_task);
1421
1422 if (ret < 0)
1423 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1424 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1425 }