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