791432ceedc3156b477802d2e64edb45446cdc45
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2012 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c The paraslash's audio daemon. */
8 #include <regex.h>
9 #include <sys/types.h>
10 #include <signal.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "crypt.h"
15 #include "audiod.cmdline.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "buffer_tree.h"
20 #include "recv.h"
21 #include "filter.h"
22 #include "grab_client.h"
23 #include "client.cmdline.h"
24 #include "client.h"
25 #include "audiod.h"
26 #include "net.h"
27 #include "daemon.h"
28 #include "string.h"
29 #include "fd.h"
30 #include "write.h"
31 #include "write_common.h"
32 #include "signal.h"
33 #include "version.h"
34
35 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
36 /** define the array of error lists needed by para_audiod */
37 INIT_AUDIOD_ERRLISTS;
38 /** define the array containing all supported audio formats */
39 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
40
41 /** Defines how audiod handles one supported audio format. */
42 struct audio_format_info {
43 /** pointer to the receiver for this audio format */
44 struct receiver *receiver;
45 /** the receiver configuration */
46 void *receiver_conf;
47 /** the number of filters that should be activated for this audio format */
48 unsigned int num_filters;
49 /** Array of filter numbers to be activated. */
50 unsigned *filter_nums;
51 /** Pointer to the array of filter configurations. */
52 void **filter_conf;
53 /** the number of filters that should be activated for this audio format */
54 unsigned int num_writers;
55 /** Array of writer numbers to be activated. */
56 int *writer_nums;
57 /** pointer to the array of writer configurations */
58 void **writer_conf;
59 /** do not start receiver/filters/writer before this time */
60 struct timeval restart_barrier;
61 };
62
63 /**
64 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
65 * be associated with a receiver/filter/writer triple. This array holds all
66 * information on the status of these slots.
67 *
68 * \sa struct slot_info
69 * */
70 struct slot_info slot[MAX_STREAM_SLOTS];
71
72 /** The vss status flags audiod is interested in. */
73 enum vss_status_flags {
74 /** Whether the 'N' flag is set. */
75 VSS_STATUS_FLAG_NEXT = 1,
76 /** The 'P' flag is set. */
77 VSS_STATUS_FLAG_PLAYING = 2,
78 };
79
80 /**
81 * The scheduler instance of para_audiod.
82 *
83 * This is needed also in audiod_command.c (for the tasks command), so it can
84 * not be made static.
85 */
86 struct sched sched = {.max_fileno = 0};
87
88 /**
89 * The task for obtaining para_server's status (para_client stat).
90 *
91 * \sa struct task, struct sched.
92 */
93 struct status_task {
94 /** The associated task structure of audiod. */
95 struct task task;
96 /** Client data associated with the stat task. */
97 struct client_task *ct;
98 /** Do not restart client command until this time. */
99 struct timeval restart_barrier;
100 /** Last time we received status data from para_server. */
101 struct timeval last_status_read;
102 size_t min_iqs;
103 /** The offset value announced by para_server. */
104 int offset_seconds;
105 /** The length of the current audio file as announced by para_server. */
106 int length_seconds;
107 /** The start of the current stream from the view of para_server. */
108 struct timeval server_stream_start;
109 /** The average time deviation between para_server and para_audiod. */
110 struct timeval sa_time_diff;
111 /** Whether client time is ahead of server time. */
112 int sa_time_diff_sign;
113 /** The 'P' and the 'N' flags as announced by para_server. */
114 enum vss_status_flags vss_status;
115 /** Number of times the clock difference is to be checked. */
116 unsigned clock_diff_count;
117 /** When to start the next check for clock difference. */
118 struct timeval clock_diff_barrier;
119 /** Number of the audio format as announced by para_server. */
120 int current_audio_format_num;
121 /* The status task btrn is the child of the client task. */
122 struct btr_node *btrn;
123 };
124
125 /** The array of status items sent by para_server. */
126 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
127
128 /**
129 * the current mode of operation of which can be changed by the on/off/cycle
130 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
131 */
132 int audiod_status = AUDIOD_ON;
133
134 /**
135 * the gengetopt args_info struct that holds information on all command line
136 * arguments
137 */
138 struct audiod_args_info conf;
139
140 static char *socket_name;
141 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
142
143 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
144
145 static struct status_task status_task_struct;
146
147 /**
148 * the task that calls the status command of para_server
149 *
150 * \sa struct status_task
151 */
152 static struct status_task *stat_task = &status_task_struct;
153
154 /**
155 * the task for handling audiod commands
156 *
157 * \sa struct task, struct sched
158 */
159 struct command_task {
160 /** the local listening socket */
161 int fd;
162 /** the associated task structure */
163 struct task task;
164 };
165
166 /** iterate over all supported audio formats */
167 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
168
169 /**
170 * Get the audio format number.
171 *
172 * \param name The name of the audio format.
173 *
174 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
175 * \a name is not a supported audio format.
176 */
177 static int get_audio_format_num(const char *name)
178 {
179 int i;
180
181 while (para_isspace(*name))
182 name++;
183 FOR_EACH_AUDIO_FORMAT(i)
184 if (!strcmp(name, audio_formats[i]))
185 return i;
186 return -E_UNSUPPORTED_AUDIO_FORMAT;
187 }
188
189 static int get_matching_audio_format_nums(const char *re)
190 {
191 int i, ret;
192 regex_t preg;
193
194 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
195 if (ret < 0)
196 return ret;
197 ret = 0;
198 FOR_EACH_AUDIO_FORMAT(i)
199 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
200 ret |= (1 << i);
201 regfree(&preg);
202 return ret;
203 }
204
205 /**
206 * Compute the play time based on information of the given slot.
207 *
208 * \param slot_num The slot number (negative means: no slot).
209 *
210 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
211 * from the status items received from para_server and the start time of the
212 * (first) writer of the given slot.
213 *
214 * It has to to take into account that probably the stream was not started at
215 * the beginning of the file, that the clock between the server and the client
216 * host may differ and that playback of the stream was delayed, e.g. because
217 * the prebuffer filter is used in the filter configuration of the given slot.
218 *
219 * If no writer is active in the given slot, or \a slot_num is negative
220 * (indicating that para_audiod runs in standby mode), an approximation based
221 * only on the status items is computed and the returned string is prefixed
222 * with "~".
223 *
224 * \return A string that must be freed by the caller.
225 */
226 char *get_time_string(int slot_num)
227 {
228 int ret, seconds = 0, length;
229 struct timeval *tmp, sum, sss, /* server stream start */
230 rstime, /* receiver start time */
231 wstime, /* writer start time */
232 wtime, /* now - writer start */
233 rskip; /* receiver start - sss */
234 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
235 char *msg;
236
237 if (audiod_status == AUDIOD_OFF)
238 goto empty;
239 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
240 if (stat_task->length_seconds) /* paused */
241 return NULL;
242 goto empty; /* stopped */
243 }
244 if (audiod_status == AUDIOD_ON && !s)
245 goto empty;
246 /*
247 * Valid status items and playing, set length and tmp to the stream
248 * start. We use the slot info and fall back to the info from current
249 * status items if no slot info is available.
250 */
251 length = stat_task->length_seconds;
252 tmp = &stat_task->server_stream_start;
253 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
254 btr_get_node_start(s->wns[0].btrn, &wstime);
255 if (wstime.tv_sec != 0) { /* writer wrote something */
256 if (s->server_stream_start.tv_sec == 0) {
257 /* copy status info to slot */
258 s->server_stream_start = stat_task->server_stream_start;
259 s->offset_seconds = stat_task->offset_seconds;
260 s->seconds_total = stat_task->length_seconds;
261 }
262 length = s->seconds_total;
263 tmp = &s->server_stream_start;
264 }
265 }
266 if (stat_task->sa_time_diff_sign > 0)
267 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
268 else
269 tv_add(tmp, &stat_task->sa_time_diff, &sss);
270 if (!s || !s->wns || !s->wns[0].btrn) {
271 struct timeval diff;
272 tv_diff(now, &sss, &diff);
273 seconds = diff.tv_sec + stat_task->offset_seconds;
274 goto out;
275 }
276 tv_diff(now, &wstime, &wtime);
277 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
278 seconds = s->offset_seconds;
279 if (s->receiver_node->btrn) {
280 btr_get_node_start(s->receiver_node->btrn, &rstime);
281 ret = tv_diff(&rstime, &sss, &rskip);
282 if (ret > 0) { /* audiod was started in the middle of the stream */
283 tv_add(&wtime, &rskip, &sum);
284 seconds += sum.tv_sec;
285 } else
286 seconds += wtime.tv_sec;
287 } else
288 seconds += wtime.tv_sec;
289 out:
290 seconds = PARA_MIN(seconds, length);
291 seconds = PARA_MAX(seconds, 0);
292 msg = make_message(
293 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
294 s? "" : "~",
295 seconds / 60,
296 seconds % 60,
297 (length - seconds) / 60,
298 (length - seconds) % 60,
299 length? (seconds * 100 + length / 2) / length : 0,
300 length / 60,
301 length % 60
302 );
303 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
304 return msg;
305 empty:
306 return para_strdup(NULL);
307 }
308
309 static int want_colors(void)
310 {
311 if (conf.color_arg == color_arg_no)
312 return 0;
313 if (conf.color_arg == color_arg_yes)
314 return 1;
315 if (conf.logfile_given)
316 return 0;
317 return isatty(STDERR_FILENO);
318 }
319
320 static void parse_config_or_die(void)
321 {
322 int ret;
323 char *config_file;
324 struct audiod_cmdline_parser_params params = {
325 .override = 0,
326 .initialize = 0,
327 .check_required = 1,
328 .check_ambiguity = 0,
329 .print_errors = 1
330 };
331
332 if (conf.config_file_given)
333 config_file = para_strdup(conf.config_file_arg);
334 else {
335 char *home = para_homedir();
336 config_file = make_message("%s/.paraslash/audiod.conf", home);
337 free(home);
338 }
339 ret = file_exists(config_file);
340 if (conf.config_file_given && !ret) {
341 PARA_EMERG_LOG("can not read config file %s\n", config_file);
342 goto err;
343 }
344 if (ret)
345 audiod_cmdline_parser_config_file(config_file, &conf, &params);
346 free(config_file);
347 daemon_set_loglevel(conf.loglevel_arg);
348 return;
349 err:
350 free(config_file);
351 exit(EXIT_FAILURE);
352 }
353
354 static void setup_signal_handling(void)
355 {
356 sig_task->fd = para_signal_init();
357 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
358 para_install_sighandler(SIGINT);
359 para_install_sighandler(SIGTERM);
360 para_install_sighandler(SIGHUP);
361 para_sigaction(SIGPIPE, SIG_IGN);
362 }
363
364 static void clear_slot(int slot_num)
365 {
366 struct slot_info *s = &slot[slot_num];
367
368 PARA_INFO_LOG("clearing slot %d\n", slot_num);
369 memset(s, 0, sizeof(struct slot_info));
370 s->format = -1;
371 }
372
373 static void close_receiver(int slot_num)
374 {
375 struct slot_info *s = &slot[slot_num];
376 struct audio_format_info *a;
377
378 if (s->format < 0 || !s->receiver_node)
379 return;
380 a = &afi[s->format];
381 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
382 audio_formats[s->format], slot_num);
383 a->receiver->close(s->receiver_node);
384 btr_remove_node(&s->receiver_node->btrn);
385 free(s->receiver_node);
386 s->receiver_node = NULL;
387 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
388 &a->restart_barrier);
389 }
390
391 static void writer_cleanup(struct writer_node *wn)
392 {
393 struct writer *w;
394
395 if (!wn)
396 return;
397 w = writers + wn->writer_num;
398 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
399 w->close(wn);
400 btr_remove_node(&wn->btrn);
401 }
402
403 static void close_writers(struct slot_info *s)
404 {
405 struct audio_format_info *a;
406 int i;
407
408 if (s->format < 0)
409 return;
410 assert(s->wns);
411 a = afi + s->format;
412 if (a->num_writers == 0)
413 writer_cleanup(s->wns);
414 else {
415 for (i = 0; i < a->num_writers; i++)
416 writer_cleanup(s->wns + i);
417 }
418 free(s->wns);
419 s->wns = NULL;
420 }
421
422 static void close_filters(struct slot_info *s)
423 {
424 int i;
425 struct audio_format_info *a = afi + s->format;
426 if (a->num_filters == 0)
427 return;
428 for (i = 0; i < a->num_filters; i++) {
429 struct filter_node *fn = s->fns + i;
430 struct filter *f;
431
432 if (!fn)
433 continue;
434 f = filters + fn->filter_num;
435 if (f->close)
436 f->close(fn);
437 btr_remove_node(&fn->btrn);
438 }
439 free(s->fns);
440 s->fns = NULL;
441 }
442
443 static void notify_receivers(int error)
444 {
445 int i;
446
447 FOR_EACH_SLOT(i) {
448 struct slot_info *s = slot + i;
449 if (s->format < 0)
450 continue;
451 if (!s->receiver_node)
452 continue;
453 task_notify(&s->receiver_node->task, error);
454 }
455 }
456
457 static int get_empty_slot(void)
458 {
459 int i;
460 struct slot_info *s;
461
462 FOR_EACH_SLOT(i) {
463 s = &slot[i];
464 if (s->format < 0) {
465 clear_slot(i);
466 return i;
467 }
468 if (s->wns || s->receiver_node || s->fns)
469 continue;
470 clear_slot(i);
471 return i;
472 }
473 return -E_NO_MORE_SLOTS;
474 }
475
476 static void open_filters(struct slot_info *s)
477 {
478 struct audio_format_info *a = afi + s->format;
479 struct filter_node *fn;
480 int nf = a->num_filters;
481 struct btr_node *parent;
482 int i;
483
484 if (nf == 0)
485 return;
486 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
487 assert(s->fns == NULL);
488 s->fns = para_calloc(nf * sizeof(struct filter_node));
489 parent = s->receiver_node->btrn;
490 for (i = 0; i < nf; i++) {
491 struct filter *f = filters + a->filter_nums[i];
492 fn = s->fns + i;
493 fn->filter_num = a->filter_nums[i];
494 fn->conf = a->filter_conf[i];
495 fn->task.pre_select = f->pre_select;
496 fn->task.post_select = f->post_select;
497
498 fn->btrn = btr_new_node(&(struct btr_node_description)
499 EMBRACE(.name = f->name, .parent = parent,
500 .handler = f->execute, .context = fn));
501
502 f->open(fn);
503 register_task(&sched, &fn->task);
504 parent = fn->btrn;
505 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
506 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
507 sprintf(fn->task.status, "%s (slot %d)", 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 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
522 for (i = 0; i < a->num_writers; i++) {
523 wn = s->wns + i;
524 wn->conf = a->writer_conf[i];
525 wn->writer_num = a->writer_nums[i];
526 register_writer_node(wn, parent, &sched);
527 }
528 }
529
530 /* returns slot num on success */
531 static int open_receiver(int format)
532 {
533 struct audio_format_info *a = &afi[format];
534 struct slot_info *s;
535 int ret, slot_num;
536 struct receiver *r = a->receiver;
537 struct receiver_node *rn;
538
539 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
540 ret = get_empty_slot();
541 if (ret < 0)
542 return ret;
543 slot_num = ret;
544 rn = para_calloc(sizeof(*rn));
545 rn->receiver = r;
546 rn->conf = a->receiver_conf;
547 rn->btrn = btr_new_node(&(struct btr_node_description)
548 EMBRACE(.name = r->name, .context = rn));
549 ret = r->open(rn);
550 if (ret < 0) {
551 btr_remove_node(&rn->btrn);
552 free(rn);
553 return ret;
554 }
555 s = &slot[slot_num];
556 s->format = format;
557 s->receiver_node = rn;
558 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
559 audio_formats[format], r->name, slot_num);
560 rn->task.pre_select = r->pre_select;
561 rn->task.post_select = r->post_select;
562 sprintf(rn->task.status, "%s receiver node", r->name);
563 register_task(&sched, &rn->task);
564 return slot_num;
565 }
566
567 static bool receiver_running(void)
568 {
569 int i;
570 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
571
572 FOR_EACH_SLOT(i) {
573 struct slot_info *s = &slot[i];
574 long unsigned ss2 = s->server_stream_start.tv_sec;
575
576 if (!s->receiver_node)
577 continue;
578 if (s->receiver_node->task.error >= 0)
579 return true;
580 if (ss1 == ss2)
581 return true;
582 }
583 return false;
584 }
585
586 /**
587 * Return the root node of the current buffer tree.
588 *
589 * This is only used for stream grabbing.
590 *
591 * \return \p NULL if no slot is currently active. If more than one buffer tree
592 * exists, the node corresponding to the most recently started receiver is
593 * returned.
594 */
595 struct btr_node *audiod_get_btr_root(void)
596 {
597 int i, newest_slot = -1;
598 struct timeval newest_rstime = {0, 0};
599
600 FOR_EACH_SLOT(i) {
601 struct slot_info *s = &slot[i];
602 struct timeval rstime;
603 if (!s->receiver_node)
604 continue;
605 if (s->receiver_node->task.error < 0)
606 continue;
607 btr_get_node_start(s->receiver_node->btrn, &rstime);
608 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
609 continue;
610 newest_rstime = rstime;
611 newest_slot = i;
612 }
613 if (newest_slot == -1)
614 return NULL;
615 return slot[newest_slot].receiver_node->btrn;
616 }
617
618 /* whether a new instance of a decoder should be started. */
619 static bool must_start_decoder(void)
620 {
621 int cafn = stat_task->current_audio_format_num;
622 unsigned vs = stat_task->vss_status;
623
624 if (audiod_status != AUDIOD_ON)
625 return false;
626 if (cafn < 0)
627 return false;
628 if (!stat_task->ct)
629 return false;
630 if (vs & VSS_STATUS_FLAG_NEXT)
631 return false;
632 if (!(vs & VSS_STATUS_FLAG_PLAYING))
633 return false;
634 if (receiver_running())
635 return false;
636 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
637 return false;
638 return true;
639 }
640
641 static unsigned compute_time_diff(const struct timeval *status_time)
642 {
643 struct timeval tmp, diff;
644 static unsigned count;
645 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
646 const struct timeval max_deviation = {0, 500 * 1000};
647 const int time_smooth = 5;
648
649 if (!status_time)
650 return count;
651 sign = tv_diff(status_time, now, &diff);
652 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
653 // sign, sa_time_diff_sign);
654 if (!count) {
655 sa_time_diff_sign = sign;
656 stat_task->sa_time_diff = diff;
657 count++;
658 goto out;
659 }
660 if (count > 5) {
661 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
662 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
663 PARA_WARNING_LOG("time diff jump: %lims\n",
664 s * tv2ms(&tmp));
665 }
666 count++;
667 sa_time_diff_sign = tv_convex_combination(
668 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
669 count > 10? sign : sign * time_smooth, &diff,
670 &tmp);
671 stat_task->sa_time_diff = tmp;
672 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
673 sign < 0? "-" : "+",
674 tv2ms(&diff),
675 sa_time_diff_sign < 0? "-" : "+",
676 tv2ms(&stat_task->sa_time_diff)
677 );
678 out:
679 stat_task->sa_time_diff_sign = sa_time_diff_sign;
680 return count;
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;
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 FOR_EACH_AUDIO_FORMAT(j) {
924 if ((af_mask & (1 << j)) == 0) /* no match */
925 continue;
926 ret = add_filter(j, arg);
927 if (ret < 0)
928 goto out;
929 }
930 }
931 ret = init_default_filters(); /* use default values for the rest */
932 out:
933 return ret;
934 }
935
936 static int parse_stream_args(void)
937 {
938 int ret;
939
940 ret = parse_receiver_args();
941 if (ret < 0)
942 return ret;
943 ret = parse_filter_args();
944 if (ret < 0)
945 return ret;
946 ret = parse_writer_args();
947 if (ret < 0)
948 return ret;
949 return 1;
950 }
951
952 /* does not unlink socket on errors */
953 static int audiod_get_socket(void)
954 {
955 struct sockaddr_un unix_addr;
956 int ret, fd;
957
958 if (conf.socket_given)
959 socket_name = para_strdup(conf.socket_arg);
960 else {
961 char *hn = para_hostname();
962 socket_name = make_message("/var/paraslash/audiod_socket.%s",
963 hn);
964 free(hn);
965 }
966 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
967 if (conf.force_given)
968 unlink(socket_name);
969 ret = create_local_socket(socket_name, &unix_addr,
970 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
971 if (ret < 0)
972 goto err;
973 fd = ret;
974 if (listen(fd , 5) < 0) {
975 ret = -ERRNO_TO_PARA_ERROR(errno);
976 goto err;
977 }
978 ret = mark_fd_nonblocking(fd);
979 if (ret < 0)
980 goto err;
981 return fd;
982 err:
983 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
984 exit(EXIT_FAILURE);
985 }
986
987 static void signal_pre_select(struct sched *s, struct task *t)
988 {
989 struct signal_task *st = container_of(t, struct signal_task, task);
990 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
991 }
992
993 static void signal_post_select(struct sched *s, __a_unused struct task *t)
994 {
995 int signum;
996
997 signum = para_next_signal(&s->rfds);
998 switch (signum) {
999 case SIGINT:
1000 case SIGTERM:
1001 case SIGHUP:
1002 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1003 clean_exit(EXIT_FAILURE, "caught deadly signal");
1004 }
1005 }
1006
1007 static void signal_setup_default(struct signal_task *st)
1008 {
1009 st->task.pre_select = signal_pre_select;
1010 st->task.post_select = signal_post_select;
1011 sprintf(st->task.status, "signal task");
1012 }
1013
1014 static void command_pre_select(struct sched *s, struct task *t)
1015 {
1016 struct command_task *ct = container_of(t, struct command_task, task);
1017 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1018 }
1019
1020 static void command_post_select(struct sched *s, struct task *t)
1021 {
1022 int ret;
1023 struct command_task *ct = container_of(t, struct command_task, task);
1024 static struct timeval last_status_dump;
1025 struct timeval tmp, delay = {0, 500 * 1000};
1026
1027 tv_add(&last_status_dump, &delay, &tmp);
1028 if (tv_diff(&tmp, now, NULL) < 0) {
1029 audiod_status_dump();
1030 last_status_dump = *now;
1031 }
1032
1033 ret = handle_connect(ct->fd, &s->rfds);
1034 if (ret < 0)
1035 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1036 audiod_status_dump();
1037 }
1038
1039 static void init_command_task(struct command_task *ct)
1040 {
1041 ct->task.pre_select = command_pre_select;
1042 ct->task.post_select = command_post_select;
1043 ct->task.error = 0;
1044 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1045 sprintf(ct->task.status, "command task");
1046 }
1047
1048 static void close_stat_pipe(void)
1049 {
1050 if (!stat_task->ct)
1051 return;
1052 client_close(stat_task->ct);
1053 stat_task->ct = NULL;
1054 clear_and_dump_items();
1055 stat_task->length_seconds = 0;
1056 stat_task->offset_seconds = 0;
1057 stat_task->vss_status = 0;
1058 stat_task->current_audio_format_num = -1;
1059 audiod_status_dump();
1060 }
1061
1062 /**
1063 * close the connection to para_server and exit
1064 *
1065 * \param status the exit status which is passed to exit(3)
1066 * \param msg the log message
1067 *
1068 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1069 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1070 * EXIT_FAILURE.
1071 *
1072 * \sa exit(3)
1073 */
1074 void __noreturn clean_exit(int status, const char *msg)
1075 {
1076 PARA_EMERG_LOG("%s\n", msg);
1077 if (socket_name)
1078 unlink(socket_name);
1079 close_stat_pipe();
1080 exit(status);
1081 }
1082
1083 /* avoid busy loop if server is down */
1084 static void set_stat_task_restart_barrier(unsigned seconds)
1085 {
1086 struct timeval delay = {seconds, 0};
1087 tv_add(now, &delay, &stat_task->restart_barrier);
1088 }
1089
1090 static void try_to_close_slot(int slot_num)
1091 {
1092 struct slot_info *s = &slot[slot_num];
1093 struct audio_format_info *a = afi + s->format;
1094 int i;
1095
1096 if (s->format < 0)
1097 return;
1098 if (s->receiver_node && s->receiver_node->task.error >= 0)
1099 return;
1100 for (i = 0; i < a->num_filters; i++)
1101 if (s->fns && s->fns[i].task.error >= 0)
1102 return;
1103 if (a->num_writers > 0) {
1104 for (i = 0; i < a->num_writers; i++)
1105 if (s->wns && s->wns[i].task.error >= 0)
1106 return;
1107 } else {
1108 if (s->wns && s->wns[0].task.error >= 0)
1109 return;
1110 }
1111 PARA_INFO_LOG("closing slot %d\n", slot_num);
1112 close_writers(s);
1113 close_filters(s);
1114 close_receiver(slot_num);
1115 clear_slot(slot_num);
1116 }
1117
1118 /*
1119 * Check if any receivers/filters/writers need to be started and do so if
1120 * necessary.
1121 */
1122 static void start_stop_decoders(void)
1123 {
1124 int i, ret;
1125 struct slot_info *sl;
1126 struct audio_format_info *a;
1127
1128 FOR_EACH_SLOT(i)
1129 try_to_close_slot(i);
1130 if (audiod_status != AUDIOD_ON ||
1131 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1132 return notify_receivers(E_NOT_PLAYING);
1133 if (!must_start_decoder())
1134 return;
1135 ret = open_receiver(stat_task->current_audio_format_num);
1136 if (ret < 0) {
1137 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1138 return;
1139 }
1140 sl = slot + ret;
1141 a = afi + sl->format;
1142 if (a->num_filters)
1143 open_filters(sl);
1144 open_writers(sl);
1145 activate_grab_clients(&sched);
1146 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1147 }
1148
1149 static void status_pre_select(struct sched *s, struct task *t)
1150 {
1151 struct status_task *st = container_of(t, struct status_task, task);
1152 int ret, cafn = stat_task->current_audio_format_num;
1153
1154 if (must_start_decoder())
1155 goto min_delay;
1156 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1157 if (ret > 0)
1158 goto min_delay;
1159 if (st->ct && audiod_status == AUDIOD_OFF)
1160 goto min_delay;
1161 if (!st->ct && audiod_status != AUDIOD_OFF)
1162 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1163 if (cafn >= 0)
1164 sched_request_barrier(&afi[cafn].restart_barrier, s);
1165 /*
1166 * If para_server is playing we'd like to have a smooth time display
1167 * even if we are running in standby mode. So we request a timeout that
1168 * expires at the next full second.
1169 */
1170 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1171 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1172 return;
1173 min_delay:
1174 sched_min_delay(s);
1175 }
1176
1177 /* restart the client task if necessary */
1178 static void status_post_select(struct sched *s, struct task *t)
1179 {
1180 struct status_task *st = container_of(t, struct status_task, task);
1181
1182 if (audiod_status == AUDIOD_OFF) {
1183 if (!st->ct)
1184 goto out;
1185 if (st->ct->task.error >= 0) {
1186 task_notify(&st->ct->task, E_AUDIOD_OFF);
1187 goto out;
1188 }
1189 close_stat_pipe();
1190 st->clock_diff_count = conf.clock_diff_count_arg;
1191 goto out;
1192 }
1193 if (st->ct) {
1194 char *buf;
1195 size_t sz;
1196 int ret;
1197 if (st->ct->task.error < 0) {
1198 close_stat_pipe();
1199 goto out;
1200 }
1201 if (st->ct->status != CL_RECEIVING)
1202 goto out;
1203 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1204 if (ret <= 0) {
1205 struct timeval diff;
1206 tv_diff(now, &st->last_status_read, &diff);
1207 if (diff.tv_sec > 61)
1208 task_notify(&st->ct->task, E_AUDIOD_OFF);
1209 goto out;
1210 }
1211 btr_merge(st->btrn, st->min_iqs);
1212 sz = btr_next_buffer(st->btrn, &buf);
1213 ret = for_each_stat_item(buf, sz, update_item);
1214 if (ret < 0) {
1215 task_notify(&st->ct->task, E_AUDIOD_OFF);
1216 goto out;
1217 }
1218 if (sz != ret) {
1219 btr_consume(st->btrn, sz - ret);
1220 st->last_status_read = *now;
1221 st->min_iqs = 0;
1222 } else /* current status item crosses buffers */
1223 st->min_iqs = sz + 1;
1224 goto out;
1225 }
1226 btr_drain(st->btrn);
1227 st->current_audio_format_num = -1;
1228 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1229 goto out;
1230 if (st->clock_diff_count) { /* get status only one time */
1231 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1232 int argc = 5;
1233 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1234 st->clock_diff_count--;
1235 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1236 set_stat_task_restart_barrier(2);
1237
1238 } else {
1239 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1240 int argc = 4;
1241 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1242 set_stat_task_restart_barrier(5);
1243 }
1244 free(stat_item_values[SI_BASENAME]);
1245 stat_item_values[SI_BASENAME] = para_strdup(
1246 "no connection to para_server");
1247 stat_client_write_item(SI_BASENAME);
1248 st->last_status_read = *now;
1249 out:
1250 start_stop_decoders();
1251 }
1252
1253 static void init_status_task(struct status_task *st)
1254 {
1255 memset(st, 0, sizeof(struct status_task));
1256 st->task.pre_select = status_pre_select;
1257 st->task.post_select = status_post_select;
1258 st->sa_time_diff_sign = 1;
1259 st->clock_diff_count = conf.clock_diff_count_arg;
1260 st->current_audio_format_num = -1;
1261 sprintf(st->task.status, "stat");
1262 st->btrn = btr_new_node(&(struct btr_node_description)
1263 EMBRACE(.name = "stat"));
1264 }
1265
1266 static void set_initial_status(void)
1267 {
1268 audiod_status = AUDIOD_ON;
1269 if (!conf.mode_given)
1270 return;
1271 if (!strcmp(conf.mode_arg, "sb")) {
1272 audiod_status = AUDIOD_STANDBY;
1273 return;
1274 }
1275 if (!strcmp(conf.mode_arg, "off")) {
1276 audiod_status = AUDIOD_OFF;
1277 return;
1278 }
1279 if (strcmp(conf.mode_arg, "on"))
1280 PARA_WARNING_LOG("invalid mode\n");
1281 }
1282
1283 __noreturn static void print_help_and_die(void)
1284 {
1285 int d = conf.detailed_help_given;
1286 const char **p = d? audiod_args_info_detailed_help
1287 : audiod_args_info_help;
1288
1289 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1290 AUDIOD_CMDLINE_PARSER_VERSION);
1291 printf_or_die("%s\n\n", audiod_args_info_usage);
1292 for (; *p; p++)
1293 printf_or_die("%s\n", *p);
1294 print_receiver_helps(d);
1295 print_filter_helps(d);
1296 print_writer_helps(d);
1297 exit(0);
1298 }
1299
1300 static void init_colors_or_die(void)
1301 {
1302 int i;
1303
1304 if (!want_colors())
1305 return;
1306 daemon_set_default_log_colors();
1307 daemon_set_flag(DF_COLOR_LOG);
1308 for (i = 0; i < conf.log_color_given; i++)
1309 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1310 }
1311
1312 /**
1313 * the main function of para_audiod
1314 *
1315 * \param argc usual argument count
1316 * \param argv usual argument vector
1317 *
1318 * \return EXIT_SUCCESS or EXIT_FAILURE
1319 *
1320 * \sa para_audiod(1)
1321 * */
1322 int main(int argc, char *argv[])
1323 {
1324 int ret, i;
1325 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1326 struct audiod_cmdline_parser_params params = {
1327 .override = 0,
1328 .initialize = 1,
1329 .check_required = 0,
1330 .check_ambiguity = 0,
1331 .print_errors = 1
1332 };
1333
1334 valid_fd_012();
1335 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1336 exit(EXIT_FAILURE);
1337 HANDLE_VERSION_FLAG("audiod", conf);
1338 /* init receivers/filters/writers early to make help work */
1339 recv_init();
1340 filter_init();
1341 writer_init();
1342 if (conf.help_given || conf.detailed_help_given)
1343 print_help_and_die();
1344 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1345 parse_config_or_die();
1346 init_colors_or_die();
1347 init_random_seed_or_die();
1348 daemon_set_flag(DF_LOG_TIME);
1349 daemon_set_flag(DF_LOG_HOSTNAME);
1350 daemon_set_flag(DF_LOG_LL);
1351 if (conf.log_timing_given)
1352 daemon_set_flag(DF_LOG_TIMING);
1353 if (conf.logfile_given) {
1354 daemon_set_logfile(conf.logfile_arg);
1355 daemon_open_log_or_die();
1356 }
1357 ret = parse_stream_args();
1358 if (ret < 0) {
1359 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1360 exit(EXIT_FAILURE);
1361 }
1362 log_welcome("para_audiod");
1363 set_server_start_time(NULL);
1364 set_initial_status();
1365 FOR_EACH_SLOT(i)
1366 clear_slot(i);
1367 setup_signal_handling();
1368 signal_setup_default(sig_task);
1369
1370 init_status_task(stat_task);
1371 init_command_task(cmd_task);
1372
1373 if (conf.daemon_given)
1374 daemonize(false /* parent exits immediately */);
1375
1376 register_task(&sched, &sig_task->task);
1377 register_task(&sched, &cmd_task->task);
1378 register_task(&sched, &stat_task->task);
1379 sched.default_timeout.tv_sec = 2;
1380 sched.default_timeout.tv_usec = 999 * 1000;
1381 ret = schedule(&sched);
1382
1383 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1384 return EXIT_FAILURE;
1385 }