audiod: Switch signal task to the alternative post select method.
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2013 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 DEFINE_RECEIVER_ARRAY;
42
43 /** Defines how audiod handles one supported audio format. */
44 struct audio_format_info {
45 /** pointer to the receiver for this audio format */
46 struct receiver *receiver;
47 /** the receiver configuration */
48 void *receiver_conf;
49 /** the number of filters that should be activated for this audio format */
50 unsigned int num_filters;
51 /** Array of filter numbers to be activated. */
52 unsigned *filter_nums;
53 /** Pointer to the array of filter configurations. */
54 void **filter_conf;
55 /** the number of filters that should be activated for this audio format */
56 unsigned int num_writers;
57 /** Array of writer numbers to be activated. */
58 int *writer_nums;
59 /** pointer to the array of writer configurations */
60 void **writer_conf;
61 /** do not start receiver/filters/writer before this time */
62 struct timeval restart_barrier;
63 };
64
65 /**
66 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
67 * be associated with a receiver/filter/writer triple. This array holds all
68 * information on the status of these slots.
69 *
70 * \sa struct slot_info
71 * */
72 struct slot_info slot[MAX_STREAM_SLOTS];
73
74 /** The vss status flags audiod is interested in. */
75 enum vss_status_flags {
76 /** Whether the 'N' flag is set. */
77 VSS_STATUS_FLAG_NEXT = 1,
78 /** The 'P' flag is set. */
79 VSS_STATUS_FLAG_PLAYING = 2,
80 };
81
82 /**
83 * The scheduler instance of para_audiod.
84 *
85 * This is needed also in audiod_command.c (for the tasks command), so it can
86 * not be made static.
87 */
88 struct sched sched = {.max_fileno = 0};
89
90 /**
91 * The task for obtaining para_server's status (para_client stat).
92 *
93 * \sa struct task, struct sched.
94 */
95 struct status_task {
96 /** The associated task structure of audiod. */
97 struct task task;
98 /** Client data associated with the stat task. */
99 struct client_task *ct;
100 /** Do not restart client command until this time. */
101 struct timeval restart_barrier;
102 /** Last time we received status data from para_server. */
103 struct timeval last_status_read;
104 size_t min_iqs;
105 /** The offset value announced by para_server. */
106 int offset_seconds;
107 /** The length of the current audio file as announced by para_server. */
108 int length_seconds;
109 /** The start of the current stream from the view of para_server. */
110 struct timeval server_stream_start;
111 /** The average time deviation between para_server and para_audiod. */
112 struct timeval sa_time_diff;
113 /** Whether client time is ahead of server time. */
114 int sa_time_diff_sign;
115 /** The 'P' and the 'N' flags as announced by para_server. */
116 enum vss_status_flags vss_status;
117 /** Number of times the clock difference is to be checked. */
118 unsigned clock_diff_count;
119 /** When to start the next check for clock difference. */
120 struct timeval clock_diff_barrier;
121 /** Number of the audio format as announced by para_server. */
122 int current_audio_format_num;
123 /* The status task btrn is the child of the client task. */
124 struct btr_node *btrn;
125 };
126
127 /** The array of status items sent by para_server. */
128 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
129
130 /**
131 * the current mode of operation of which can be changed by the on/off/cycle
132 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
133 */
134 int audiod_status = AUDIOD_ON;
135
136 /**
137 * the gengetopt args_info struct that holds information on all command line
138 * arguments
139 */
140 struct audiod_args_info conf;
141
142 static char *socket_name;
143 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
144
145 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
146
147 static struct status_task status_task_struct;
148
149 /**
150 * the task that calls the status command of para_server
151 *
152 * \sa struct status_task
153 */
154 static struct status_task *stat_task = &status_task_struct;
155
156 /**
157 * the task for handling audiod commands
158 *
159 * \sa struct task, struct sched
160 */
161 struct command_task {
162 /** the local listening socket */
163 int fd;
164 /** the associated task structure */
165 struct task task;
166 };
167
168 /** iterate over all supported audio formats */
169 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
170
171 /**
172 * Get the audio format number.
173 *
174 * \param name The name of the audio format.
175 *
176 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
177 * \a name is not a supported audio format.
178 */
179 static int get_audio_format_num(const char *name)
180 {
181 int i;
182
183 while (para_isspace(*name))
184 name++;
185 FOR_EACH_AUDIO_FORMAT(i)
186 if (!strcmp(name, audio_formats[i]))
187 return i;
188 return -E_UNSUPPORTED_AUDIO_FORMAT;
189 }
190
191 static int get_matching_audio_format_nums(const char *re)
192 {
193 int i, ret;
194 regex_t preg;
195
196 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
197 if (ret < 0)
198 return ret;
199 ret = 0;
200 FOR_EACH_AUDIO_FORMAT(i)
201 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
202 ret |= (1 << i);
203 regfree(&preg);
204 return ret;
205 }
206
207 /**
208 * Compute the play time based on information of the given slot.
209 *
210 * \param slot_num The slot number (negative means: no slot).
211 *
212 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
213 * from the status items received from para_server and the start time of the
214 * (first) writer of the given slot.
215 *
216 * It has to to take into account that probably the stream was not started at
217 * the beginning of the file, that the clock between the server and the client
218 * host may differ and that playback of the stream was delayed, e.g. because
219 * the prebuffer filter is used in the filter configuration of the given slot.
220 *
221 * If no writer is active in the given slot, or \a slot_num is negative
222 * (indicating that para_audiod runs in standby mode), an approximation based
223 * only on the status items is computed and the returned string is prefixed
224 * with "~".
225 *
226 * \return A string that must be freed by the caller.
227 */
228 char *get_time_string(int slot_num)
229 {
230 int ret, seconds = 0, length;
231 struct timeval *tmp, sum, sss, /* server stream start */
232 rstime, /* receiver start time */
233 wstime, /* writer start time */
234 wtime, /* now - writer start */
235 rskip; /* receiver start - sss */
236 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
237 char *msg;
238
239 if (audiod_status == AUDIOD_OFF)
240 goto empty;
241 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
242 if (stat_task->length_seconds) /* paused */
243 return NULL;
244 goto empty; /* stopped */
245 }
246 if (audiod_status == AUDIOD_ON && !s)
247 goto empty;
248 /*
249 * Valid status items and playing, set length and tmp to the stream
250 * start. We use the slot info and fall back to the info from current
251 * status items if no slot info is available.
252 */
253 length = stat_task->length_seconds;
254 tmp = &stat_task->server_stream_start;
255 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
256 btr_get_node_start(s->wns[0].btrn, &wstime);
257 if (wstime.tv_sec != 0) { /* writer wrote something */
258 if (s->server_stream_start.tv_sec == 0) {
259 /* copy status info to slot */
260 s->server_stream_start = stat_task->server_stream_start;
261 s->offset_seconds = stat_task->offset_seconds;
262 s->seconds_total = stat_task->length_seconds;
263 }
264 length = s->seconds_total;
265 tmp = &s->server_stream_start;
266 }
267 }
268 if (stat_task->sa_time_diff_sign > 0)
269 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
270 else
271 tv_add(tmp, &stat_task->sa_time_diff, &sss);
272 if (!s || !s->wns || !s->wns[0].btrn) {
273 struct timeval diff;
274 tv_diff(now, &sss, &diff);
275 seconds = diff.tv_sec + stat_task->offset_seconds;
276 goto out;
277 }
278 tv_diff(now, &wstime, &wtime);
279 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
280 seconds = s->offset_seconds;
281 if (s->receiver_node->btrn) {
282 btr_get_node_start(s->receiver_node->btrn, &rstime);
283 ret = tv_diff(&rstime, &sss, &rskip);
284 if (ret > 0) { /* audiod was started in the middle of the stream */
285 tv_add(&wtime, &rskip, &sum);
286 seconds += sum.tv_sec;
287 } else
288 seconds += wtime.tv_sec;
289 } else
290 seconds += wtime.tv_sec;
291 out:
292 seconds = PARA_MIN(seconds, length);
293 seconds = PARA_MAX(seconds, 0);
294 msg = make_message(
295 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
296 s? "" : "~",
297 seconds / 60,
298 seconds % 60,
299 (length - seconds) / 60,
300 (length - seconds) % 60,
301 length? (seconds * 100 + length / 2) / length : 0,
302 length / 60,
303 length % 60
304 );
305 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
306 return msg;
307 empty:
308 return para_strdup(NULL);
309 }
310
311 static int want_colors(void)
312 {
313 if (conf.color_arg == color_arg_no)
314 return 0;
315 if (conf.color_arg == color_arg_yes)
316 return 1;
317 if (conf.logfile_given)
318 return 0;
319 return isatty(STDERR_FILENO);
320 }
321
322 static void parse_config_or_die(void)
323 {
324 int ret;
325 char *config_file;
326 struct audiod_cmdline_parser_params params = {
327 .override = 0,
328 .initialize = 0,
329 .check_required = 1,
330 .check_ambiguity = 0,
331 .print_errors = 1
332 };
333
334 if (conf.config_file_given)
335 config_file = para_strdup(conf.config_file_arg);
336 else {
337 char *home = para_homedir();
338 config_file = make_message("%s/.paraslash/audiod.conf", home);
339 free(home);
340 }
341 ret = file_exists(config_file);
342 if (conf.config_file_given && !ret) {
343 PARA_EMERG_LOG("can not read config file %s\n", config_file);
344 goto err;
345 }
346 if (ret)
347 audiod_cmdline_parser_config_file(config_file, &conf, &params);
348 free(config_file);
349 daemon_set_loglevel(conf.loglevel_arg);
350 return;
351 err:
352 free(config_file);
353 exit(EXIT_FAILURE);
354 }
355
356 static void setup_signal_handling(void)
357 {
358 sig_task->fd = para_signal_init();
359 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
360 para_install_sighandler(SIGINT);
361 para_install_sighandler(SIGTERM);
362 para_install_sighandler(SIGHUP);
363 para_sigaction(SIGPIPE, SIG_IGN);
364 }
365
366 static void clear_slot(int slot_num)
367 {
368 struct slot_info *s = &slot[slot_num];
369
370 PARA_INFO_LOG("clearing slot %d\n", slot_num);
371 memset(s, 0, sizeof(struct slot_info));
372 s->format = -1;
373 }
374
375 static void close_receiver(int slot_num)
376 {
377 struct slot_info *s = &slot[slot_num];
378 struct audio_format_info *a;
379
380 if (s->format < 0 || !s->receiver_node)
381 return;
382 a = &afi[s->format];
383 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
384 audio_formats[s->format], slot_num);
385 a->receiver->close(s->receiver_node);
386 btr_remove_node(&s->receiver_node->btrn);
387 free(s->receiver_node);
388 s->receiver_node = NULL;
389 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
390 &a->restart_barrier);
391 }
392
393 static void writer_cleanup(struct writer_node *wn)
394 {
395 struct writer *w;
396
397 if (!wn)
398 return;
399 w = writers + wn->writer_num;
400 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
401 w->close(wn);
402 btr_remove_node(&wn->btrn);
403 }
404
405 static void close_writers(struct slot_info *s)
406 {
407 struct audio_format_info *a;
408 int i;
409
410 if (s->format < 0)
411 return;
412 assert(s->wns);
413 a = afi + s->format;
414 if (a->num_writers == 0)
415 writer_cleanup(s->wns);
416 else {
417 for (i = 0; i < a->num_writers; i++)
418 writer_cleanup(s->wns + i);
419 }
420 free(s->wns);
421 s->wns = NULL;
422 }
423
424 static void close_filters(struct slot_info *s)
425 {
426 int i;
427 struct audio_format_info *a = afi + s->format;
428 if (a->num_filters == 0)
429 return;
430 for (i = 0; i < a->num_filters; i++) {
431 struct filter_node *fn = s->fns + i;
432 struct filter *f;
433
434 if (!fn)
435 continue;
436 f = filters + fn->filter_num;
437 if (f->close)
438 f->close(fn);
439 btr_remove_node(&fn->btrn);
440 }
441 free(s->fns);
442 s->fns = NULL;
443 }
444
445 static void notify_receivers(int error)
446 {
447 int i;
448
449 FOR_EACH_SLOT(i) {
450 struct slot_info *s = slot + i;
451 if (s->format < 0)
452 continue;
453 if (!s->receiver_node)
454 continue;
455 task_notify(&s->receiver_node->task, error);
456 }
457 }
458
459 static int get_empty_slot(void)
460 {
461 int i;
462 struct slot_info *s;
463
464 FOR_EACH_SLOT(i) {
465 s = &slot[i];
466 if (s->format < 0) {
467 clear_slot(i);
468 return i;
469 }
470 if (s->wns || s->receiver_node || s->fns)
471 continue;
472 clear_slot(i);
473 return i;
474 }
475 return -E_NO_MORE_SLOTS;
476 }
477
478 static void open_filters(struct slot_info *s)
479 {
480 struct audio_format_info *a = afi + s->format;
481 struct filter_node *fn;
482 int nf = a->num_filters;
483 struct btr_node *parent;
484 int i;
485
486 if (nf == 0)
487 return;
488 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
489 assert(s->fns == NULL);
490 s->fns = para_calloc(nf * sizeof(struct filter_node));
491 parent = s->receiver_node->btrn;
492 for (i = 0; i < nf; i++) {
493 struct filter *f = filters + a->filter_nums[i];
494 fn = s->fns + i;
495 fn->filter_num = a->filter_nums[i];
496 fn->conf = a->filter_conf[i];
497 fn->task.pre_select = f->pre_select;
498 if (f->new_post_select) {
499 fn->task.new_post_select = f->new_post_select;
500 fn->task.post_select = NULL;
501 } else {
502 fn->task.new_post_select = NULL;
503 fn->task.post_select = f->post_select;
504 }
505 fn->btrn = btr_new_node(&(struct btr_node_description)
506 EMBRACE(.name = f->name, .parent = parent,
507 .handler = f->execute, .context = fn));
508
509 f->open(fn);
510 register_task(&sched, &fn->task);
511 parent = fn->btrn;
512 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
513 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
514 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
515 }
516 }
517
518 static void open_writers(struct slot_info *s)
519 {
520 int i;
521 struct audio_format_info *a = afi + s->format;
522 struct writer_node *wn;
523 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
524
525 assert(s->wns == NULL);
526 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
527 * sizeof(struct writer_node));
528 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
529 for (i = 0; i < a->num_writers; i++) {
530 wn = s->wns + i;
531 wn->conf = a->writer_conf[i];
532 wn->writer_num = a->writer_nums[i];
533 register_writer_node(wn, parent, &sched);
534 }
535 }
536
537 /* returns slot num on success */
538 static int open_receiver(int format)
539 {
540 struct audio_format_info *a = &afi[format];
541 struct slot_info *s;
542 int ret, slot_num;
543 struct receiver *r = a->receiver;
544 struct receiver_node *rn;
545
546 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
547 ret = get_empty_slot();
548 if (ret < 0)
549 return ret;
550 slot_num = ret;
551 rn = para_calloc(sizeof(*rn));
552 rn->receiver = r;
553 rn->conf = a->receiver_conf;
554 rn->btrn = btr_new_node(&(struct btr_node_description)
555 EMBRACE(.name = r->name, .context = rn));
556 ret = r->open(rn);
557 if (ret < 0) {
558 btr_remove_node(&rn->btrn);
559 free(rn);
560 return ret;
561 }
562 s = &slot[slot_num];
563 s->format = format;
564 s->receiver_node = rn;
565 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
566 audio_formats[format], r->name, slot_num);
567 rn->task.pre_select = r->pre_select;
568 if (r->new_post_select) {
569 rn->task.new_post_select = r->new_post_select;
570 rn->task.post_select = NULL;
571 } else {
572 rn->task.new_post_select = NULL;
573 rn->task.post_select = r->post_select;
574 }
575 sprintf(rn->task.status, "%s receiver node", r->name);
576 register_task(&sched, &rn->task);
577 return slot_num;
578 }
579
580 static bool receiver_running(void)
581 {
582 int i;
583 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
584
585 FOR_EACH_SLOT(i) {
586 struct slot_info *s = &slot[i];
587 long unsigned ss2 = s->server_stream_start.tv_sec;
588
589 if (!s->receiver_node)
590 continue;
591 if (s->receiver_node->task.error >= 0)
592 return true;
593 if (ss1 == ss2)
594 return true;
595 }
596 return false;
597 }
598
599 /**
600 * Return the root node of the current buffer tree.
601 *
602 * This is only used for stream grabbing.
603 *
604 * \return \p NULL if no slot is currently active. If more than one buffer tree
605 * exists, the node corresponding to the most recently started receiver is
606 * returned.
607 */
608 struct btr_node *audiod_get_btr_root(void)
609 {
610 int i, newest_slot = -1;
611 struct timeval newest_rstime = {0, 0};
612
613 FOR_EACH_SLOT(i) {
614 struct slot_info *s = &slot[i];
615 struct timeval rstime;
616 if (!s->receiver_node)
617 continue;
618 if (s->receiver_node->task.error < 0)
619 continue;
620 btr_get_node_start(s->receiver_node->btrn, &rstime);
621 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
622 continue;
623 newest_rstime = rstime;
624 newest_slot = i;
625 }
626 if (newest_slot == -1)
627 return NULL;
628 return slot[newest_slot].receiver_node->btrn;
629 }
630
631 /* whether a new instance of a decoder should be started. */
632 static bool must_start_decoder(void)
633 {
634 int cafn = stat_task->current_audio_format_num;
635 unsigned vs = stat_task->vss_status;
636
637 if (audiod_status != AUDIOD_ON)
638 return false;
639 if (cafn < 0)
640 return false;
641 if (!stat_task->ct)
642 return false;
643 if (vs & VSS_STATUS_FLAG_NEXT)
644 return false;
645 if (!(vs & VSS_STATUS_FLAG_PLAYING))
646 return false;
647 if (receiver_running())
648 return false;
649 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
650 return false;
651 return true;
652 }
653
654 static unsigned compute_time_diff(const struct timeval *status_time)
655 {
656 struct timeval tmp, diff;
657 static unsigned count;
658 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
659 const struct timeval max_deviation = {0, 500 * 1000};
660 const int time_smooth = 5;
661
662 if (!status_time)
663 return count;
664 sign = tv_diff(status_time, now, &diff);
665 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
666 // sign, sa_time_diff_sign);
667 if (!count) {
668 sa_time_diff_sign = sign;
669 stat_task->sa_time_diff = diff;
670 count++;
671 goto out;
672 }
673 if (count > 5) {
674 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
675 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
676 PARA_WARNING_LOG("time diff jump: %lims\n",
677 s * tv2ms(&tmp));
678 }
679 count++;
680 sa_time_diff_sign = tv_convex_combination(
681 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
682 count > 10? sign : sign * time_smooth, &diff,
683 &tmp);
684 stat_task->sa_time_diff = tmp;
685 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
686 sign < 0? "-" : "+",
687 tv2ms(&diff),
688 sa_time_diff_sign < 0? "-" : "+",
689 tv2ms(&stat_task->sa_time_diff)
690 );
691 out:
692 stat_task->sa_time_diff_sign = sa_time_diff_sign;
693 return count;
694 }
695
696 static int update_item(int itemnum, char *buf)
697 {
698 long unsigned sec, usec;
699
700 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
701 return 1;
702 free(stat_item_values[itemnum]);
703 stat_item_values[itemnum] = para_strdup(buf);
704 stat_client_write_item(itemnum);
705 switch (itemnum) {
706 case SI_STATUS_FLAGS:
707 stat_task->vss_status = 0;
708 if (strchr(buf, 'N'))
709 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
710 if (strchr(buf, 'P'))
711 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
712 break;
713 case SI_OFFSET:
714 stat_task->offset_seconds = atoi(buf);
715 break;
716 case SI_SECONDS_TOTAL:
717 stat_task->length_seconds = atoi(buf);
718 break;
719 case SI_STREAM_START:
720 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
721 stat_task->server_stream_start.tv_sec = sec;
722 stat_task->server_stream_start.tv_usec = usec;
723 }
724 break;
725 case SI_CURRENT_TIME:
726 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
727 struct timeval tv = {sec, usec};
728 compute_time_diff(&tv);
729 }
730 break;
731 case SI_FORMAT:
732 stat_task->current_audio_format_num
733 = get_audio_format_num(buf);
734 }
735 return 1;
736 }
737
738 static int parse_stream_command(const char *txt, char **cmd)
739 {
740 int ret, len;
741 char *re, *p = strchr(txt, ':');
742
743 if (!p)
744 return -E_MISSING_COLON;
745 *cmd = p + 1;
746 len = p - txt;
747 re = malloc(len + 1);
748 strncpy(re, txt, len);
749 re[len] = '\0';
750 ret = get_matching_audio_format_nums(re);
751 free(re);
752 return ret;
753 }
754
755 static int add_filter(int format, char *cmdline)
756 {
757 struct audio_format_info *a = &afi[format];
758 int filter_num, nf = a->num_filters;
759 void *cfg;
760
761 filter_num = check_filter_arg(cmdline, &cfg);
762 if (filter_num < 0)
763 return filter_num;
764 a->filter_conf = para_realloc(a->filter_conf,
765 (nf + 1) * sizeof(void *));
766 a->filter_nums = para_realloc(a->filter_nums,
767 (nf + 1) * sizeof(unsigned));
768 a->filter_nums[nf] = filter_num;
769 a->filter_conf[nf] = cfg;
770 a->num_filters++;
771 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
772 filters[filter_num].name);
773 return filter_num;
774 }
775
776 static int parse_writer_args(void)
777 {
778 int i, ret;
779 char *cmd;
780 struct audio_format_info *a;
781
782 for (i = 0; i < conf.writer_given; i++) {
783 void *wconf;
784 int j, nw, writer_num, af_mask;
785
786 ret = parse_stream_command(conf.writer_arg[i], &cmd);
787 if (ret < 0)
788 return ret;
789 af_mask = ret;
790 FOR_EACH_AUDIO_FORMAT(j) {
791 a = afi + j;
792 if ((af_mask & (1 << j)) == 0) /* no match */
793 continue;
794 wconf = check_writer_arg_or_die(cmd, &writer_num);
795 nw = a->num_writers;
796 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
797 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
798 a->writer_nums[nw] = writer_num;
799 a->writer_conf[nw] = wconf;
800 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
801 nw, writer_names[writer_num]);
802 a->num_writers++;
803 }
804 }
805 /* Use default writer for audio formats which are not yet set up. */
806 FOR_EACH_AUDIO_FORMAT(i) {
807 void *writer_conf;
808 int writer_num;
809 a = afi + i;
810 if (a->num_writers > 0)
811 continue; /* already set up */
812 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
813 a->writer_nums = para_malloc(sizeof(int));
814 a->writer_nums[0] = writer_num;
815 a->writer_conf = para_malloc(sizeof(void *));
816 a->writer_conf[0] = writer_conf;
817 a->num_writers = 1;
818 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
819 writer_names[writer_num]);
820 }
821 return 1;
822 }
823
824 static int parse_receiver_args(void)
825 {
826 int i, ret, receiver_num;
827 char *cmd = NULL;
828 struct audio_format_info *a;
829
830 for (i = conf.receiver_given - 1; i >= 0; i--) {
831 char *arg;
832 int j, af_mask;
833
834 ret = parse_stream_command(conf.receiver_arg[i], &arg);
835 if (ret < 0)
836 goto out;
837 af_mask = ret;
838 FOR_EACH_AUDIO_FORMAT(j) {
839 a = afi + j;
840 if ((af_mask & (1 << j)) == 0) /* no match */
841 continue;
842 /*
843 * If multiple receivers are given for this audio format, the
844 * last one wins and we have to free the previous receiver
845 * config here. Since we are iterating backwards, the winning
846 * receiver arg is in fact the first one given.
847 */
848 if (a->receiver_conf)
849 a->receiver->free_config(a->receiver_conf);
850 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
851 ret = -E_RECV_SYNTAX;
852 if (!a->receiver_conf)
853 goto out;
854 a->receiver = receivers + receiver_num;
855 }
856 }
857 /*
858 * Use the first available receiver with no arguments for those audio
859 * formats for which no receiver was specified.
860 */
861 cmd = para_strdup(receivers[0].name);
862 FOR_EACH_AUDIO_FORMAT(i) {
863 a = &afi[i];
864 if (a->receiver_conf)
865 continue;
866 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
867 if (!a->receiver_conf)
868 return -E_RECV_SYNTAX;
869 a->receiver = &receivers[receiver_num];
870 }
871 FOR_EACH_AUDIO_FORMAT(i) {
872 a = afi + i;
873 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
874 audio_formats[i], a->receiver->name);
875 }
876 ret = 1;
877 out:
878 free(cmd);
879 return ret;
880 }
881
882 static int init_default_filters(void)
883 {
884 int i, ret = 1;
885
886 FOR_EACH_AUDIO_FORMAT(i) {
887 struct audio_format_info *a = &afi[i];
888 char *tmp;
889 int j;
890
891 if (a->num_filters)
892 continue; /* no default -- nothing to to */
893 /*
894 * udp and dccp streams are fec-encoded, so add fecdec as the
895 * first filter.
896 */
897 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
898 strcmp(afi[i].receiver->name, "dccp") == 0) {
899 tmp = para_strdup("fecdec");
900 add_filter(i, tmp);
901 free(tmp);
902 if (ret < 0)
903 goto out;
904 }
905 /* add "dec" to audio format name */
906 tmp = make_message("%sdec", audio_formats[i]);
907 for (j = 0; filters[j].name; j++)
908 if (!strcmp(tmp, filters[j].name))
909 break;
910 free(tmp);
911 ret = -E_UNSUPPORTED_FILTER;
912 if (!filters[j].name)
913 goto out;
914 tmp = para_strdup(filters[j].name);
915 ret = add_filter(i, tmp);
916 free(tmp);
917 if (ret < 0)
918 goto out;
919 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
920 filters[j].name);
921 }
922 out:
923 return ret;
924 }
925
926 static int parse_filter_args(void)
927 {
928 int i, j, ret, af_mask;
929
930 for (i = 0; i < conf.filter_given; i++) {
931 char *arg;
932 ret = parse_stream_command(conf.filter_arg[i], &arg);
933 if (ret < 0)
934 goto out;
935 af_mask = ret;
936 FOR_EACH_AUDIO_FORMAT(j) {
937 if ((af_mask & (1 << j)) == 0) /* no match */
938 continue;
939 ret = add_filter(j, arg);
940 if (ret < 0)
941 goto out;
942 }
943 }
944 ret = init_default_filters(); /* use default values for the rest */
945 out:
946 return ret;
947 }
948
949 static int parse_stream_args(void)
950 {
951 int ret;
952
953 ret = parse_receiver_args();
954 if (ret < 0)
955 return ret;
956 ret = parse_filter_args();
957 if (ret < 0)
958 return ret;
959 ret = parse_writer_args();
960 if (ret < 0)
961 return ret;
962 return 1;
963 }
964
965 /* does not unlink socket on errors */
966 static int audiod_get_socket(void)
967 {
968 struct sockaddr_un unix_addr;
969 int ret, fd;
970
971 if (conf.socket_given)
972 socket_name = para_strdup(conf.socket_arg);
973 else {
974 char *hn = para_hostname();
975 socket_name = make_message("/var/paraslash/audiod_socket.%s",
976 hn);
977 free(hn);
978 }
979 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
980 if (conf.force_given)
981 unlink(socket_name);
982 ret = create_local_socket(socket_name, &unix_addr,
983 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
984 if (ret < 0)
985 goto err;
986 fd = ret;
987 if (listen(fd , 5) < 0) {
988 ret = -ERRNO_TO_PARA_ERROR(errno);
989 goto err;
990 }
991 ret = mark_fd_nonblocking(fd);
992 if (ret < 0)
993 goto err;
994 return fd;
995 err:
996 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
997 exit(EXIT_FAILURE);
998 }
999
1000 static void signal_pre_select(struct sched *s, struct task *t)
1001 {
1002 struct signal_task *st = container_of(t, struct signal_task, task);
1003 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1004 }
1005
1006 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1007 {
1008 int signum;
1009
1010 signum = para_next_signal(&s->rfds);
1011 switch (signum) {
1012 case SIGINT:
1013 case SIGTERM:
1014 case SIGHUP:
1015 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1016 clean_exit(EXIT_FAILURE, "caught deadly signal");
1017 }
1018 return 0;
1019 }
1020
1021 static void signal_setup_default(struct signal_task *st)
1022 {
1023 st->task.pre_select = signal_pre_select;
1024 st->task.new_post_select = signal_post_select;
1025 st->task.post_select = NULL;
1026 sprintf(st->task.status, "signal task");
1027 }
1028
1029 static void command_pre_select(struct sched *s, struct task *t)
1030 {
1031 struct command_task *ct = container_of(t, struct command_task, task);
1032 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1033 }
1034
1035 static void command_post_select(struct sched *s, struct task *t)
1036 {
1037 int ret;
1038 struct command_task *ct = container_of(t, struct command_task, task);
1039 static struct timeval last_status_dump;
1040 struct timeval tmp, delay = {0, 500 * 1000};
1041
1042 tv_add(&last_status_dump, &delay, &tmp);
1043 if (tv_diff(&tmp, now, NULL) < 0) {
1044 audiod_status_dump();
1045 last_status_dump = *now;
1046 }
1047
1048 ret = handle_connect(ct->fd, &s->rfds);
1049 if (ret < 0)
1050 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1051 audiod_status_dump();
1052 }
1053
1054 static void init_command_task(struct command_task *ct)
1055 {
1056 ct->task.pre_select = command_pre_select;
1057 ct->task.post_select = command_post_select;
1058 ct->task.new_post_select = NULL;
1059 ct->task.error = 0;
1060 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1061 sprintf(ct->task.status, "command task");
1062 }
1063
1064 static void close_stat_pipe(void)
1065 {
1066 if (!stat_task->ct)
1067 return;
1068 client_close(stat_task->ct);
1069 stat_task->ct = NULL;
1070 clear_and_dump_items();
1071 stat_task->length_seconds = 0;
1072 stat_task->offset_seconds = 0;
1073 stat_task->vss_status = 0;
1074 stat_task->current_audio_format_num = -1;
1075 audiod_status_dump();
1076 }
1077
1078 /**
1079 * close the connection to para_server and exit
1080 *
1081 * \param status the exit status which is passed to exit(3)
1082 * \param msg the log message
1083 *
1084 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1085 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1086 * EXIT_FAILURE.
1087 *
1088 * \sa exit(3)
1089 */
1090 void __noreturn clean_exit(int status, const char *msg)
1091 {
1092 PARA_EMERG_LOG("%s\n", msg);
1093 if (socket_name)
1094 unlink(socket_name);
1095 close_stat_pipe();
1096 exit(status);
1097 }
1098
1099 /* avoid busy loop if server is down */
1100 static void set_stat_task_restart_barrier(unsigned seconds)
1101 {
1102 struct timeval delay = {seconds, 0};
1103 tv_add(now, &delay, &stat_task->restart_barrier);
1104 }
1105
1106 static bool must_close_slot(int slot_num)
1107 {
1108 struct slot_info *s = &slot[slot_num];
1109 struct audio_format_info *a = afi + s->format;
1110 int i;
1111
1112 if (s->format < 0)
1113 return false;
1114 if (s->receiver_node && s->receiver_node->task.error >= 0)
1115 return false;
1116 for (i = 0; i < a->num_filters; i++)
1117 if (s->fns && s->fns[i].task.error >= 0)
1118 return false;
1119 if (a->num_writers > 0) {
1120 for (i = 0; i < a->num_writers; i++)
1121 if (s->wns && s->wns[i].task.error >= 0)
1122 return false;
1123 } else {
1124 if (s->wns && s->wns[0].task.error >= 0)
1125 return false;
1126 }
1127 return true;
1128 }
1129
1130 static void close_unused_slots(void)
1131 {
1132 int i;
1133
1134 FOR_EACH_SLOT(i) {
1135 struct slot_info *s = slot + i;
1136 if (!must_close_slot(i))
1137 continue;
1138 PARA_INFO_LOG("closing slot %d\n", i);
1139 close_writers(s);
1140 close_filters(s);
1141 close_receiver(i);
1142 clear_slot(i);
1143 }
1144 }
1145
1146 /*
1147 * Check if any receivers/filters/writers need to be started and do so if
1148 * necessary.
1149 */
1150 static void start_stop_decoders(void)
1151 {
1152 int ret;
1153 struct slot_info *sl;
1154 struct audio_format_info *a;
1155
1156 close_unused_slots();
1157 if (audiod_status != AUDIOD_ON ||
1158 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1159 return notify_receivers(E_NOT_PLAYING);
1160 if (!must_start_decoder())
1161 return;
1162 ret = open_receiver(stat_task->current_audio_format_num);
1163 if (ret < 0) {
1164 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1165 return;
1166 }
1167 sl = slot + ret;
1168 a = afi + sl->format;
1169 if (a->num_filters)
1170 open_filters(sl);
1171 open_writers(sl);
1172 activate_grab_clients(&sched);
1173 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1174 }
1175
1176 static void status_pre_select(struct sched *s, struct task *t)
1177 {
1178 struct status_task *st = container_of(t, struct status_task, task);
1179 int i, ret, cafn = stat_task->current_audio_format_num;
1180
1181 if (must_start_decoder())
1182 goto min_delay;
1183 FOR_EACH_SLOT(i)
1184 if (must_close_slot(i))
1185 goto min_delay;
1186 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1187 if (ret > 0)
1188 goto min_delay;
1189 if (st->ct && audiod_status == AUDIOD_OFF)
1190 goto min_delay;
1191 if (!st->ct && audiod_status != AUDIOD_OFF)
1192 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1193 if (cafn >= 0)
1194 sched_request_barrier(&afi[cafn].restart_barrier, s);
1195 /*
1196 * If para_server is playing we'd like to have a smooth time display
1197 * even if we are running in standby mode. So we request a timeout that
1198 * expires at the next full second.
1199 */
1200 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1201 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1202 return;
1203 min_delay:
1204 sched_min_delay(s);
1205 }
1206
1207 /* restart the client task if necessary */
1208 static void status_post_select(struct sched *s, struct task *t)
1209 {
1210 struct status_task *st = container_of(t, struct status_task, task);
1211
1212 if (audiod_status == AUDIOD_OFF) {
1213 if (!st->ct)
1214 goto out;
1215 if (st->ct->task.error >= 0) {
1216 task_notify(&st->ct->task, E_AUDIOD_OFF);
1217 goto out;
1218 }
1219 close_stat_pipe();
1220 st->clock_diff_count = conf.clock_diff_count_arg;
1221 goto out;
1222 }
1223 if (st->ct) {
1224 char *buf;
1225 size_t sz;
1226 int ret;
1227 if (st->ct->task.error < 0) {
1228 close_stat_pipe();
1229 goto out;
1230 }
1231 if (st->ct->status != CL_RECEIVING)
1232 goto out;
1233 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1234 if (ret <= 0) {
1235 struct timeval diff;
1236 tv_diff(now, &st->last_status_read, &diff);
1237 if (diff.tv_sec > 61)
1238 task_notify(&st->ct->task, E_AUDIOD_OFF);
1239 goto out;
1240 }
1241 btr_merge(st->btrn, st->min_iqs);
1242 sz = btr_next_buffer(st->btrn, &buf);
1243 ret = for_each_stat_item(buf, sz, update_item);
1244 if (ret < 0) {
1245 task_notify(&st->ct->task, E_AUDIOD_OFF);
1246 goto out;
1247 }
1248 if (sz != ret) {
1249 btr_consume(st->btrn, sz - ret);
1250 st->last_status_read = *now;
1251 st->min_iqs = 0;
1252 } else /* current status item crosses buffers */
1253 st->min_iqs = sz + 1;
1254 goto out;
1255 }
1256 btr_drain(st->btrn);
1257 st->current_audio_format_num = -1;
1258 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1259 goto out;
1260 if (st->clock_diff_count) { /* get status only one time */
1261 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1262 int argc = 5;
1263 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1264 st->clock_diff_count--;
1265 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1266 set_stat_task_restart_barrier(2);
1267
1268 } else {
1269 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1270 int argc = 4;
1271 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1272 set_stat_task_restart_barrier(5);
1273 }
1274 free(stat_item_values[SI_BASENAME]);
1275 stat_item_values[SI_BASENAME] = para_strdup(
1276 "no connection to para_server");
1277 stat_client_write_item(SI_BASENAME);
1278 st->last_status_read = *now;
1279 out:
1280 start_stop_decoders();
1281 }
1282
1283 static void init_status_task(struct status_task *st)
1284 {
1285 memset(st, 0, sizeof(struct status_task));
1286 st->task.pre_select = status_pre_select;
1287 st->task.post_select = status_post_select;
1288 st->sa_time_diff_sign = 1;
1289 st->clock_diff_count = conf.clock_diff_count_arg;
1290 st->current_audio_format_num = -1;
1291 sprintf(st->task.status, "stat");
1292 st->btrn = btr_new_node(&(struct btr_node_description)
1293 EMBRACE(.name = "stat"));
1294 }
1295
1296 static void set_initial_status(void)
1297 {
1298 audiod_status = AUDIOD_ON;
1299 if (!conf.mode_given)
1300 return;
1301 if (!strcmp(conf.mode_arg, "sb")) {
1302 audiod_status = AUDIOD_STANDBY;
1303 return;
1304 }
1305 if (!strcmp(conf.mode_arg, "off")) {
1306 audiod_status = AUDIOD_OFF;
1307 return;
1308 }
1309 if (strcmp(conf.mode_arg, "on"))
1310 PARA_WARNING_LOG("invalid mode\n");
1311 }
1312
1313 __noreturn static void print_help_and_die(void)
1314 {
1315 int d = conf.detailed_help_given;
1316 const char **p = d? audiod_args_info_detailed_help
1317 : audiod_args_info_help;
1318
1319 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1320 AUDIOD_CMDLINE_PARSER_VERSION);
1321 printf_or_die("%s\n\n", audiod_args_info_usage);
1322 for (; *p; p++)
1323 printf_or_die("%s\n", *p);
1324 print_receiver_helps(d);
1325 print_filter_helps(d);
1326 print_writer_helps(d);
1327 exit(0);
1328 }
1329
1330 static void init_colors_or_die(void)
1331 {
1332 int i;
1333
1334 if (!want_colors())
1335 return;
1336 daemon_set_default_log_colors();
1337 daemon_set_flag(DF_COLOR_LOG);
1338 for (i = 0; i < conf.log_color_given; i++)
1339 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1340 }
1341
1342 /**
1343 * the main function of para_audiod
1344 *
1345 * \param argc usual argument count
1346 * \param argv usual argument vector
1347 *
1348 * \return EXIT_SUCCESS or EXIT_FAILURE
1349 *
1350 * \sa para_audiod(1)
1351 * */
1352 int main(int argc, char *argv[])
1353 {
1354 int ret, i;
1355 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1356 struct audiod_cmdline_parser_params params = {
1357 .override = 0,
1358 .initialize = 1,
1359 .check_required = 0,
1360 .check_ambiguity = 0,
1361 .print_errors = 1
1362 };
1363
1364 valid_fd_012();
1365 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1366 exit(EXIT_FAILURE);
1367 HANDLE_VERSION_FLAG("audiod", conf);
1368 /* init receivers/filters/writers early to make help work */
1369 recv_init();
1370 filter_init();
1371 writer_init();
1372 if (conf.help_given || conf.detailed_help_given)
1373 print_help_and_die();
1374 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1375 parse_config_or_die();
1376 init_colors_or_die();
1377 init_random_seed_or_die();
1378 daemon_set_flag(DF_LOG_TIME);
1379 daemon_set_flag(DF_LOG_HOSTNAME);
1380 daemon_set_flag(DF_LOG_LL);
1381 if (conf.log_timing_given)
1382 daemon_set_flag(DF_LOG_TIMING);
1383 if (conf.logfile_given) {
1384 daemon_set_logfile(conf.logfile_arg);
1385 daemon_open_log_or_die();
1386 }
1387 ret = parse_stream_args();
1388 if (ret < 0) {
1389 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1390 exit(EXIT_FAILURE);
1391 }
1392 log_welcome("para_audiod");
1393 set_server_start_time(NULL);
1394 set_initial_status();
1395 FOR_EACH_SLOT(i)
1396 clear_slot(i);
1397 setup_signal_handling();
1398 signal_setup_default(sig_task);
1399
1400 init_status_task(stat_task);
1401 init_command_task(cmd_task);
1402
1403 if (conf.daemon_given)
1404 daemonize(false /* parent exits immediately */);
1405
1406 register_task(&sched, &sig_task->task);
1407 register_task(&sched, &cmd_task->task);
1408 register_task(&sched, &stat_task->task);
1409 sched.default_timeout.tv_sec = 2;
1410 sched.default_timeout.tv_usec = 999 * 1000;
1411 ret = schedule(&sched);
1412
1413 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1414 return EXIT_FAILURE;
1415 }