f8dde0c2a2f1427ac38e6e598b7e169ff7d626b0
[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 "recv.h"
20 #include "buffer_tree.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 /*
444 * Whenever a task commits suicide by returning from post_select with t->error
445 * < 0, it also removes its btr node. We do exactly that to kill a running
446 * task. Note that the scheduler checks t->error also _before_ each pre/post
447 * select call, so the victim will never be scheduled again.
448 */
449 static void kill_btrn(struct btr_node **btrnp, struct task *t, int error)
450 {
451 if (t->error < 0)
452 return;
453 t->error = error;
454 btr_remove_node(btrnp);
455 }
456
457 static void notify_receivers(int error)
458 {
459 int i;
460
461 FOR_EACH_SLOT(i) {
462 struct slot_info *s = slot + i;
463 if (s->format < 0)
464 continue;
465 if (!s->receiver_node)
466 continue;
467 task_notify(&s->receiver_node->task, error);
468 }
469 }
470
471 static int get_empty_slot(void)
472 {
473 int i;
474 struct slot_info *s;
475
476 FOR_EACH_SLOT(i) {
477 s = &slot[i];
478 if (s->format < 0) {
479 clear_slot(i);
480 return i;
481 }
482 if (s->wns || s->receiver_node || s->fns)
483 continue;
484 clear_slot(i);
485 return i;
486 }
487 return -E_NO_MORE_SLOTS;
488 }
489
490 static void open_filters(struct slot_info *s)
491 {
492 struct audio_format_info *a = afi + s->format;
493 struct filter_node *fn;
494 int nf = a->num_filters;
495 struct btr_node *parent;
496 int i;
497
498 if (nf == 0)
499 return;
500 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
501 assert(s->fns == NULL);
502 s->fns = para_calloc(nf * sizeof(struct filter_node));
503 parent = s->receiver_node->btrn;
504 for (i = 0; i < nf; i++) {
505 struct filter *f = filters + a->filter_nums[i];
506 fn = s->fns + i;
507 fn->filter_num = a->filter_nums[i];
508 fn->conf = a->filter_conf[i];
509 fn->task.pre_select = f->pre_select;
510 fn->task.post_select = f->post_select;
511
512 fn->btrn = btr_new_node(&(struct btr_node_description)
513 EMBRACE(.name = f->name, .parent = parent,
514 .handler = f->execute, .context = fn));
515
516 f->open(fn);
517 register_task(&sched, &fn->task);
518 parent = fn->btrn;
519 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
520 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
521 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
522 }
523 }
524
525 static void open_writers(struct slot_info *s)
526 {
527 int i;
528 struct audio_format_info *a = afi + s->format;
529 struct writer_node *wn;
530 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
531
532 assert(s->wns == NULL);
533 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
534 * sizeof(struct writer_node));
535 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
536 for (i = 0; i < a->num_writers; i++) {
537 wn = s->wns + i;
538 wn->conf = a->writer_conf[i];
539 wn->writer_num = a->writer_nums[i];
540 register_writer_node(wn, parent, &sched);
541 }
542 }
543
544 /* returns slot num on success */
545 static int open_receiver(int format)
546 {
547 struct audio_format_info *a = &afi[format];
548 struct slot_info *s;
549 int ret, slot_num;
550 struct receiver *r = a->receiver;
551 struct receiver_node *rn;
552
553 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
554 ret = get_empty_slot();
555 if (ret < 0)
556 return ret;
557 slot_num = ret;
558 rn = para_calloc(sizeof(*rn));
559 rn->receiver = r;
560 rn->conf = a->receiver_conf;
561 rn->btrn = btr_new_node(&(struct btr_node_description)
562 EMBRACE(.name = r->name, .context = rn));
563 ret = r->open(rn);
564 if (ret < 0) {
565 btr_remove_node(&rn->btrn);
566 free(rn);
567 return ret;
568 }
569 s = &slot[slot_num];
570 s->format = format;
571 s->receiver_node = rn;
572 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
573 audio_formats[format], r->name, slot_num);
574 rn->task.pre_select = r->pre_select;
575 rn->task.post_select = r->post_select;
576 sprintf(rn->task.status, "%s receiver node", r->name);
577 register_task(&sched, &rn->task);
578 return slot_num;
579 }
580
581 static bool receiver_running(void)
582 {
583 int i;
584 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
585
586 FOR_EACH_SLOT(i) {
587 struct slot_info *s = &slot[i];
588 long unsigned ss2 = s->server_stream_start.tv_sec;
589
590 if (!s->receiver_node)
591 continue;
592 if (s->receiver_node->task.error >= 0)
593 return true;
594 if (ss1 == ss2)
595 return true;
596 }
597 return false;
598 }
599
600 /**
601 * Return the root node of the current buffer tree.
602 *
603 * This is only used for stream grabbing.
604 *
605 * \return \p NULL if no slot is currently active. If more than one buffer tree
606 * exists, the node corresponding to the most recently started receiver is
607 * returned.
608 */
609 struct btr_node *audiod_get_btr_root(void)
610 {
611 int i, newest_slot = -1;
612 struct timeval newest_rstime = {0, 0};
613
614 FOR_EACH_SLOT(i) {
615 struct slot_info *s = &slot[i];
616 struct timeval rstime;
617 if (!s->receiver_node)
618 continue;
619 if (s->receiver_node->task.error < 0)
620 continue;
621 btr_get_node_start(s->receiver_node->btrn, &rstime);
622 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
623 continue;
624 newest_rstime = rstime;
625 newest_slot = i;
626 }
627 if (newest_slot == -1)
628 return NULL;
629 return slot[newest_slot].receiver_node->btrn;
630 }
631
632 /* whether a new instance of a decoder should be started. */
633 static bool must_start_decoder(void)
634 {
635 int cafn = stat_task->current_audio_format_num;
636 unsigned vs = stat_task->vss_status;
637
638 if (audiod_status != AUDIOD_ON)
639 return false;
640 if (cafn < 0)
641 return false;
642 if (!stat_task->ct)
643 return false;
644 if (vs & VSS_STATUS_FLAG_NEXT)
645 return false;
646 if (!(vs & VSS_STATUS_FLAG_PLAYING))
647 return false;
648 if (receiver_running())
649 return false;
650 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
651 return false;
652 return true;
653 }
654
655 static unsigned compute_time_diff(const struct timeval *status_time)
656 {
657 struct timeval tmp, diff;
658 static unsigned count;
659 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
660 const struct timeval max_deviation = {0, 500 * 1000};
661 const int time_smooth = 5;
662
663 if (!status_time)
664 return count;
665 sign = tv_diff(status_time, now, &diff);
666 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
667 // sign, sa_time_diff_sign);
668 if (!count) {
669 sa_time_diff_sign = sign;
670 stat_task->sa_time_diff = diff;
671 count++;
672 goto out;
673 }
674 if (count > 5) {
675 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
676 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
677 PARA_WARNING_LOG("time diff jump: %lims\n",
678 s * tv2ms(&tmp));
679 }
680 count++;
681 sa_time_diff_sign = tv_convex_combination(
682 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
683 count > 10? sign : sign * time_smooth, &diff,
684 &tmp);
685 stat_task->sa_time_diff = tmp;
686 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
687 sign < 0? "-" : "+",
688 tv2ms(&diff),
689 sa_time_diff_sign < 0? "-" : "+",
690 tv2ms(&stat_task->sa_time_diff)
691 );
692 out:
693 stat_task->sa_time_diff_sign = sa_time_diff_sign;
694 return count;
695 }
696
697 static int update_item(int itemnum, char *buf)
698 {
699 long unsigned sec, usec;
700
701 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
702 return 1;
703 free(stat_item_values[itemnum]);
704 stat_item_values[itemnum] = para_strdup(buf);
705 stat_client_write_item(itemnum);
706 switch (itemnum) {
707 case SI_STATUS_FLAGS:
708 stat_task->vss_status = 0;
709 if (strchr(buf, 'N'))
710 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
711 if (strchr(buf, 'P'))
712 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
713 break;
714 case SI_OFFSET:
715 stat_task->offset_seconds = atoi(buf);
716 break;
717 case SI_SECONDS_TOTAL:
718 stat_task->length_seconds = atoi(buf);
719 break;
720 case SI_STREAM_START:
721 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
722 stat_task->server_stream_start.tv_sec = sec;
723 stat_task->server_stream_start.tv_usec = usec;
724 }
725 break;
726 case SI_CURRENT_TIME:
727 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
728 struct timeval tv = {sec, usec};
729 compute_time_diff(&tv);
730 }
731 break;
732 case SI_FORMAT:
733 stat_task->current_audio_format_num
734 = get_audio_format_num(buf);
735 }
736 return 1;
737 }
738
739 static int parse_stream_command(const char *txt, char **cmd)
740 {
741 int ret, len;
742 char *re, *p = strchr(txt, ':');
743
744 if (!p)
745 return -E_MISSING_COLON;
746 *cmd = p + 1;
747 len = p - txt;
748 re = malloc(len + 1);
749 strncpy(re, txt, len);
750 re[len] = '\0';
751 ret = get_matching_audio_format_nums(re);
752 free(re);
753 return ret;
754 }
755
756 static int add_filter(int format, char *cmdline)
757 {
758 struct audio_format_info *a = &afi[format];
759 int filter_num, nf = a->num_filters;
760 void *cfg;
761
762 filter_num = check_filter_arg(cmdline, &cfg);
763 if (filter_num < 0)
764 return filter_num;
765 a->filter_conf = para_realloc(a->filter_conf,
766 (nf + 1) * sizeof(void *));
767 a->filter_nums = para_realloc(a->filter_nums,
768 (nf + 1) * sizeof(unsigned));
769 a->filter_nums[nf] = filter_num;
770 a->filter_conf[nf] = cfg;
771 a->num_filters++;
772 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
773 filters[filter_num].name);
774 return filter_num;
775 }
776
777 static int parse_writer_args(void)
778 {
779 int i, ret;
780 char *cmd;
781 struct audio_format_info *a;
782
783 for (i = 0; i < conf.writer_given; i++) {
784 void *wconf;
785 int j, nw, writer_num, af_mask;
786
787 ret = parse_stream_command(conf.writer_arg[i], &cmd);
788 if (ret < 0)
789 return ret;
790 af_mask = ret;
791 FOR_EACH_AUDIO_FORMAT(j) {
792 a = afi + j;
793 if ((af_mask & (1 << j)) == 0) /* no match */
794 continue;
795 wconf = check_writer_arg_or_die(cmd, &writer_num);
796 nw = a->num_writers;
797 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
798 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
799 a->writer_nums[nw] = writer_num;
800 a->writer_conf[nw] = wconf;
801 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
802 nw, writer_names[writer_num]);
803 a->num_writers++;
804 }
805 }
806 /* Use default writer for audio formats which are not yet set up. */
807 FOR_EACH_AUDIO_FORMAT(i) {
808 void *writer_conf;
809 int writer_num;
810 a = afi + i;
811 if (a->num_writers > 0)
812 continue; /* already set up */
813 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
814 a->writer_nums = para_malloc(sizeof(int));
815 a->writer_nums[0] = writer_num;
816 a->writer_conf = para_malloc(sizeof(void *));
817 a->writer_conf[0] = writer_conf;
818 a->num_writers = 1;
819 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
820 writer_names[writer_num]);
821 }
822 return 1;
823 }
824
825 static int parse_receiver_args(void)
826 {
827 int i, ret, receiver_num;
828 char *cmd = NULL;
829 struct audio_format_info *a;
830
831 for (i = conf.receiver_given - 1; i >= 0; i--) {
832 char *arg;
833 int j, af_mask;
834
835 ret = parse_stream_command(conf.receiver_arg[i], &arg);
836 if (ret < 0)
837 goto out;
838 af_mask = ret;
839 FOR_EACH_AUDIO_FORMAT(j) {
840 a = afi + j;
841 if ((af_mask & (1 << j)) == 0) /* no match */
842 continue;
843 /*
844 * If multiple receivers are given for this audio format, the
845 * last one wins and we have to free the previous receiver
846 * config here. Since we are iterating backwards, the winning
847 * receiver arg is in fact the first one given.
848 */
849 if (a->receiver_conf)
850 a->receiver->free_config(a->receiver_conf);
851 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
852 ret = -E_RECV_SYNTAX;
853 if (!a->receiver_conf)
854 goto out;
855 a->receiver = receivers + receiver_num;
856 }
857 }
858 /*
859 * Use the first available receiver with no arguments for those audio
860 * formats for which no receiver was specified.
861 */
862 cmd = para_strdup(receivers[0].name);
863 FOR_EACH_AUDIO_FORMAT(i) {
864 a = &afi[i];
865 if (a->receiver_conf)
866 continue;
867 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
868 if (!a->receiver_conf)
869 return -E_RECV_SYNTAX;
870 a->receiver = &receivers[receiver_num];
871 }
872 FOR_EACH_AUDIO_FORMAT(i) {
873 a = afi + i;
874 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
875 audio_formats[i], a->receiver->name);
876 }
877 ret = 1;
878 out:
879 free(cmd);
880 return ret;
881 }
882
883 static int init_default_filters(void)
884 {
885 int i, ret = 1;
886
887 FOR_EACH_AUDIO_FORMAT(i) {
888 struct audio_format_info *a = &afi[i];
889 char *tmp;
890 int j;
891
892 if (a->num_filters)
893 continue; /* no default -- nothing to to */
894 /*
895 * udp and dccp streams are fec-encoded, so add fecdec as the
896 * first filter.
897 */
898 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
899 strcmp(afi[i].receiver->name, "dccp") == 0) {
900 tmp = para_strdup("fecdec");
901 add_filter(i, tmp);
902 free(tmp);
903 if (ret < 0)
904 goto out;
905 }
906 /* add "dec" to audio format name */
907 tmp = make_message("%sdec", audio_formats[i]);
908 for (j = 0; filters[j].name; j++)
909 if (!strcmp(tmp, filters[j].name))
910 break;
911 free(tmp);
912 ret = -E_UNSUPPORTED_FILTER;
913 if (!filters[j].name)
914 goto out;
915 tmp = para_strdup(filters[j].name);
916 ret = add_filter(i, tmp);
917 free(tmp);
918 if (ret < 0)
919 goto out;
920 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
921 filters[j].name);
922 }
923 out:
924 return ret;
925 }
926
927 static int parse_filter_args(void)
928 {
929 int i, j, ret, af_mask;
930
931 for (i = 0; i < conf.filter_given; i++) {
932 char *arg;
933 ret = parse_stream_command(conf.filter_arg[i], &arg);
934 if (ret < 0)
935 goto out;
936 af_mask = ret;
937 FOR_EACH_AUDIO_FORMAT(j) {
938 if ((af_mask & (1 << j)) == 0) /* no match */
939 continue;
940 ret = add_filter(j, arg);
941 if (ret < 0)
942 goto out;
943 }
944 }
945 ret = init_default_filters(); /* use default values for the rest */
946 out:
947 return ret;
948 }
949
950 static int parse_stream_args(void)
951 {
952 int ret;
953
954 ret = parse_receiver_args();
955 if (ret < 0)
956 return ret;
957 ret = parse_filter_args();
958 if (ret < 0)
959 return ret;
960 ret = parse_writer_args();
961 if (ret < 0)
962 return ret;
963 return 1;
964 }
965
966 /* does not unlink socket on errors */
967 static int audiod_get_socket(void)
968 {
969 struct sockaddr_un unix_addr;
970 int ret, fd;
971
972 if (conf.socket_given)
973 socket_name = para_strdup(conf.socket_arg);
974 else {
975 char *hn = para_hostname();
976 socket_name = make_message("/var/paraslash/audiod_socket.%s",
977 hn);
978 free(hn);
979 }
980 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
981 if (conf.force_given)
982 unlink(socket_name);
983 ret = create_local_socket(socket_name, &unix_addr,
984 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
985 if (ret < 0)
986 goto err;
987 fd = ret;
988 if (listen(fd , 5) < 0) {
989 ret = -ERRNO_TO_PARA_ERROR(errno);
990 goto err;
991 }
992 ret = mark_fd_nonblocking(fd);
993 if (ret < 0)
994 goto err;
995 return fd;
996 err:
997 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
998 exit(EXIT_FAILURE);
999 }
1000
1001 static void signal_pre_select(struct sched *s, struct task *t)
1002 {
1003 struct signal_task *st = container_of(t, struct signal_task, task);
1004 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1005 }
1006
1007 static void signal_post_select(struct sched *s, __a_unused struct task *t)
1008 {
1009 int signum;
1010
1011 signum = para_next_signal(&s->rfds);
1012 switch (signum) {
1013 case SIGINT:
1014 case SIGTERM:
1015 case SIGHUP:
1016 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1017 clean_exit(EXIT_FAILURE, "caught deadly signal");
1018 }
1019 }
1020
1021 static void signal_setup_default(struct signal_task *st)
1022 {
1023 st->task.pre_select = signal_pre_select;
1024 st->task.post_select = signal_post_select;
1025 sprintf(st->task.status, "signal task");
1026 }
1027
1028 static void command_pre_select(struct sched *s, struct task *t)
1029 {
1030 struct command_task *ct = container_of(t, struct command_task, task);
1031 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1032 }
1033
1034 static void command_post_select(struct sched *s, struct task *t)
1035 {
1036 int ret;
1037 struct command_task *ct = container_of(t, struct command_task, task);
1038 static struct timeval last_status_dump;
1039 struct timeval tmp, delay = {0, 500 * 1000};
1040
1041 tv_add(&last_status_dump, &delay, &tmp);
1042 if (tv_diff(&tmp, now, NULL) < 0) {
1043 audiod_status_dump();
1044 last_status_dump = *now;
1045 }
1046
1047 ret = handle_connect(ct->fd, &s->rfds);
1048 if (ret < 0)
1049 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1050 audiod_status_dump();
1051 }
1052
1053 static void init_command_task(struct command_task *ct)
1054 {
1055 ct->task.pre_select = command_pre_select;
1056 ct->task.post_select = command_post_select;
1057 ct->task.error = 0;
1058 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1059 sprintf(ct->task.status, "command task");
1060 }
1061
1062 static void close_stat_pipe(void)
1063 {
1064 if (!stat_task->ct)
1065 return;
1066 client_close(stat_task->ct);
1067 stat_task->ct = NULL;
1068 clear_and_dump_items();
1069 stat_task->length_seconds = 0;
1070 stat_task->offset_seconds = 0;
1071 stat_task->vss_status = 0;
1072 stat_task->current_audio_format_num = -1;
1073 audiod_status_dump();
1074 }
1075
1076 /**
1077 * close the connection to para_server and exit
1078 *
1079 * \param status the exit status which is passed to exit(3)
1080 * \param msg the log message
1081 *
1082 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1083 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1084 * EXIT_FAILURE.
1085 *
1086 * \sa exit(3)
1087 */
1088 void __noreturn clean_exit(int status, const char *msg)
1089 {
1090 PARA_EMERG_LOG("%s\n", msg);
1091 if (socket_name)
1092 unlink(socket_name);
1093 close_stat_pipe();
1094 exit(status);
1095 }
1096
1097 /* avoid busy loop if server is down */
1098 static void set_stat_task_restart_barrier(unsigned seconds)
1099 {
1100 struct timeval delay = {seconds, 0};
1101 tv_add(now, &delay, &stat_task->restart_barrier);
1102 }
1103
1104 static void try_to_close_slot(int slot_num)
1105 {
1106 struct slot_info *s = &slot[slot_num];
1107 struct audio_format_info *a = afi + s->format;
1108 int i;
1109
1110 if (s->format < 0)
1111 return;
1112 if (s->receiver_node && s->receiver_node->task.error >= 0)
1113 return;
1114 for (i = 0; i < a->num_filters; i++)
1115 if (s->fns && s->fns[i].task.error >= 0)
1116 return;
1117 if (a->num_writers > 0) {
1118 for (i = 0; i < a->num_writers; i++)
1119 if (s->wns && s->wns[i].task.error >= 0)
1120 return;
1121 } else {
1122 if (s->wns && s->wns[0].task.error >= 0)
1123 return;
1124 }
1125 PARA_INFO_LOG("closing slot %d\n", slot_num);
1126 close_writers(s);
1127 close_filters(s);
1128 close_receiver(slot_num);
1129 clear_slot(slot_num);
1130 }
1131
1132 /*
1133 * Check if any receivers/filters/writers need to be started and do so if
1134 * necessary.
1135 */
1136 static void start_stop_decoders(void)
1137 {
1138 int i, ret;
1139 struct slot_info *sl;
1140 struct audio_format_info *a;
1141
1142 FOR_EACH_SLOT(i)
1143 try_to_close_slot(i);
1144 if (audiod_status != AUDIOD_ON ||
1145 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1146 return notify_receivers(E_NOT_PLAYING);
1147 if (!must_start_decoder())
1148 return;
1149 ret = open_receiver(stat_task->current_audio_format_num);
1150 if (ret < 0) {
1151 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1152 return;
1153 }
1154 sl = slot + ret;
1155 a = afi + sl->format;
1156 if (a->num_filters)
1157 open_filters(sl);
1158 open_writers(sl);
1159 activate_grab_clients(&sched);
1160 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1161 }
1162
1163 static void status_pre_select(struct sched *s, struct task *t)
1164 {
1165 struct status_task *st = container_of(t, struct status_task, task);
1166 int ret, cafn = stat_task->current_audio_format_num;
1167
1168 if (must_start_decoder())
1169 goto min_delay;
1170 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1171 if (ret > 0)
1172 goto min_delay;
1173 if (st->ct && audiod_status == AUDIOD_OFF)
1174 goto min_delay;
1175 if (!st->ct && audiod_status != AUDIOD_OFF)
1176 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1177 if (cafn >= 0)
1178 sched_request_barrier(&afi[cafn].restart_barrier, s);
1179 /*
1180 * If para_server is playing we'd like to have a smooth time display
1181 * even if we are running in standby mode. So we request a timeout that
1182 * expires at the next full second.
1183 */
1184 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1185 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1186 return;
1187 min_delay:
1188 sched_min_delay(s);
1189 }
1190
1191 /* restart the client task if necessary */
1192 static void status_post_select(struct sched *s, struct task *t)
1193 {
1194 struct status_task *st = container_of(t, struct status_task, task);
1195
1196 if (audiod_status == AUDIOD_OFF) {
1197 if (!st->ct)
1198 goto out;
1199 if (st->ct->task.error >= 0) {
1200 kill_btrn(&st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1201 goto out;
1202 }
1203 close_stat_pipe();
1204 st->clock_diff_count = conf.clock_diff_count_arg;
1205 goto out;
1206 }
1207 if (st->ct) {
1208 char *buf;
1209 size_t sz;
1210 int ret;
1211 if (st->ct->task.error < 0) {
1212 close_stat_pipe();
1213 goto out;
1214 }
1215 if (st->ct->status != CL_RECEIVING)
1216 goto out;
1217 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1218 if (ret <= 0) {
1219 struct timeval diff;
1220 tv_diff(now, &st->last_status_read, &diff);
1221 if (diff.tv_sec > 61)
1222 kill_btrn(&st->ct->btrn, &st->ct->task,
1223 -E_STATUS_TIMEOUT);
1224 goto out;
1225 }
1226 btr_merge(st->btrn, st->min_iqs);
1227 sz = btr_next_buffer(st->btrn, &buf);
1228 ret = for_each_stat_item(buf, sz, update_item);
1229 if (ret < 0) {
1230 kill_btrn(&st->ct->btrn, &st->ct->task, ret);
1231 goto out;
1232 }
1233 if (sz != ret) {
1234 btr_consume(st->btrn, sz - ret);
1235 st->last_status_read = *now;
1236 st->min_iqs = 0;
1237 } else /* current status item crosses buffers */
1238 st->min_iqs = sz + 1;
1239 goto out;
1240 }
1241 btr_drain(st->btrn);
1242 st->current_audio_format_num = -1;
1243 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1244 goto out;
1245 if (st->clock_diff_count) { /* get status only one time */
1246 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1247 int argc = 5;
1248 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1249 st->clock_diff_count--;
1250 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1251 set_stat_task_restart_barrier(2);
1252
1253 } else {
1254 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1255 int argc = 4;
1256 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1257 set_stat_task_restart_barrier(5);
1258 }
1259 free(stat_item_values[SI_BASENAME]);
1260 stat_item_values[SI_BASENAME] = para_strdup(
1261 "no connection to para_server");
1262 stat_client_write_item(SI_BASENAME);
1263 st->last_status_read = *now;
1264 out:
1265 start_stop_decoders();
1266 }
1267
1268 static void init_status_task(struct status_task *st)
1269 {
1270 memset(st, 0, sizeof(struct status_task));
1271 st->task.pre_select = status_pre_select;
1272 st->task.post_select = status_post_select;
1273 st->sa_time_diff_sign = 1;
1274 st->clock_diff_count = conf.clock_diff_count_arg;
1275 st->current_audio_format_num = -1;
1276 sprintf(st->task.status, "stat");
1277 st->btrn = btr_new_node(&(struct btr_node_description)
1278 EMBRACE(.name = "stat"));
1279 }
1280
1281 static void set_initial_status(void)
1282 {
1283 audiod_status = AUDIOD_ON;
1284 if (!conf.mode_given)
1285 return;
1286 if (!strcmp(conf.mode_arg, "sb")) {
1287 audiod_status = AUDIOD_STANDBY;
1288 return;
1289 }
1290 if (!strcmp(conf.mode_arg, "off")) {
1291 audiod_status = AUDIOD_OFF;
1292 return;
1293 }
1294 if (strcmp(conf.mode_arg, "on"))
1295 PARA_WARNING_LOG("invalid mode\n");
1296 }
1297
1298 __noreturn static void print_help_and_die(void)
1299 {
1300 int d = conf.detailed_help_given;
1301 const char **p = d? audiod_args_info_detailed_help
1302 : audiod_args_info_help;
1303
1304 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1305 AUDIOD_CMDLINE_PARSER_VERSION);
1306 printf_or_die("%s\n\n", audiod_args_info_usage);
1307 for (; *p; p++)
1308 printf_or_die("%s\n", *p);
1309 print_receiver_helps(d);
1310 print_filter_helps(d);
1311 print_writer_helps(d);
1312 exit(0);
1313 }
1314
1315 static void init_colors_or_die(void)
1316 {
1317 int i;
1318
1319 if (!want_colors())
1320 return;
1321 daemon_set_default_log_colors();
1322 daemon_set_flag(DF_COLOR_LOG);
1323 for (i = 0; i < conf.log_color_given; i++)
1324 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1325 }
1326
1327 /**
1328 * the main function of para_audiod
1329 *
1330 * \param argc usual argument count
1331 * \param argv usual argument vector
1332 *
1333 * \return EXIT_SUCCESS or EXIT_FAILURE
1334 *
1335 * \sa para_audiod(1)
1336 * */
1337 int main(int argc, char *argv[])
1338 {
1339 int ret, i;
1340 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1341 struct audiod_cmdline_parser_params params = {
1342 .override = 0,
1343 .initialize = 1,
1344 .check_required = 0,
1345 .check_ambiguity = 0,
1346 .print_errors = 1
1347 };
1348
1349 valid_fd_012();
1350 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1351 exit(EXIT_FAILURE);
1352 HANDLE_VERSION_FLAG("audiod", conf);
1353 /* init receivers/filters/writers early to make help work */
1354 recv_init();
1355 filter_init();
1356 writer_init();
1357 if (conf.help_given || conf.detailed_help_given)
1358 print_help_and_die();
1359 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1360 parse_config_or_die();
1361 init_colors_or_die();
1362 init_random_seed_or_die();
1363 daemon_set_flag(DF_LOG_TIME);
1364 daemon_set_flag(DF_LOG_HOSTNAME);
1365 daemon_set_flag(DF_LOG_LL);
1366 if (conf.log_timing_given)
1367 daemon_set_flag(DF_LOG_TIMING);
1368 if (conf.logfile_given) {
1369 daemon_set_logfile(conf.logfile_arg);
1370 daemon_open_log_or_die();
1371 }
1372 ret = parse_stream_args();
1373 if (ret < 0) {
1374 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1375 exit(EXIT_FAILURE);
1376 }
1377 log_welcome("para_audiod");
1378 set_server_start_time(NULL);
1379 set_initial_status();
1380 FOR_EACH_SLOT(i)
1381 clear_slot(i);
1382 setup_signal_handling();
1383 signal_setup_default(sig_task);
1384
1385 init_status_task(stat_task);
1386 init_command_task(cmd_task);
1387
1388 if (conf.daemon_given)
1389 daemonize(false /* parent exits immediately */);
1390
1391 register_task(&sched, &sig_task->task);
1392 register_task(&sched, &cmd_task->task);
1393 register_task(&sched, &stat_task->task);
1394 sched.default_timeout.tv_sec = 2;
1395 sched.default_timeout.tv_usec = 999 * 1000;
1396 ret = schedule(&sched);
1397
1398 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1399 return EXIT_FAILURE;
1400 }