audiod: Make compute_time_diff() return void.
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2014 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 take into account that the stream was probably 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 daemon_set_loglevel(conf.loglevel_arg);
349 }
350 free(config_file);
351 return;
352 err:
353 free(config_file);
354 exit(EXIT_FAILURE);
355 }
356
357 static void setup_signal_handling(void)
358 {
359 sig_task->fd = para_signal_init();
360 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
361 para_install_sighandler(SIGINT);
362 para_install_sighandler(SIGTERM);
363 para_install_sighandler(SIGHUP);
364 para_sigaction(SIGPIPE, SIG_IGN);
365 }
366
367 static void clear_slot(int slot_num)
368 {
369 struct slot_info *s = &slot[slot_num];
370
371 PARA_INFO_LOG("clearing slot %d\n", slot_num);
372 memset(s, 0, sizeof(struct slot_info));
373 s->format = -1;
374 }
375
376 static void close_receiver(int slot_num)
377 {
378 struct slot_info *s = &slot[slot_num];
379 struct audio_format_info *a;
380
381 if (s->format < 0 || !s->receiver_node)
382 return;
383 a = &afi[s->format];
384 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
385 audio_formats[s->format], slot_num);
386 a->receiver->close(s->receiver_node);
387 btr_remove_node(&s->receiver_node->btrn);
388 free(s->receiver_node);
389 s->receiver_node = NULL;
390 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
391 &a->restart_barrier);
392 }
393
394 static void writer_cleanup(struct writer_node *wn)
395 {
396 struct writer *w;
397
398 if (!wn)
399 return;
400 w = writers + wn->writer_num;
401 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
402 w->close(wn);
403 btr_remove_node(&wn->btrn);
404 }
405
406 static void close_writers(struct slot_info *s)
407 {
408 struct audio_format_info *a;
409 int i;
410
411 if (s->format < 0)
412 return;
413 assert(s->wns);
414 a = afi + s->format;
415 if (a->num_writers == 0)
416 writer_cleanup(s->wns);
417 else {
418 for (i = 0; i < a->num_writers; i++)
419 writer_cleanup(s->wns + i);
420 }
421 free(s->wns);
422 s->wns = NULL;
423 }
424
425 static void close_filters(struct slot_info *s)
426 {
427 int i;
428 struct audio_format_info *a = afi + s->format;
429 if (a->num_filters == 0)
430 return;
431 for (i = a->num_filters - 1; i >= 0; i--) {
432 struct filter_node *fn = s->fns + i;
433 struct filter *f;
434
435 if (!fn)
436 continue;
437 f = filters + fn->filter_num;
438 if (f->close)
439 f->close(fn);
440 btr_remove_node(&fn->btrn);
441 }
442 free(s->fns);
443 s->fns = NULL;
444 }
445
446 static void notify_receivers(int error)
447 {
448 int i;
449
450 FOR_EACH_SLOT(i) {
451 struct slot_info *s = slot + i;
452 if (s->format < 0)
453 continue;
454 if (!s->receiver_node)
455 continue;
456 task_notify(&s->receiver_node->task, error);
457 }
458 }
459
460 static int get_empty_slot(void)
461 {
462 int i;
463 struct slot_info *s;
464
465 FOR_EACH_SLOT(i) {
466 s = &slot[i];
467 if (s->format < 0) {
468 clear_slot(i);
469 return i;
470 }
471 if (s->wns || s->receiver_node || s->fns)
472 continue;
473 clear_slot(i);
474 return i;
475 }
476 return -E_NO_MORE_SLOTS;
477 }
478
479 static void open_filters(struct slot_info *s)
480 {
481 struct audio_format_info *a = afi + s->format;
482 struct filter_node *fn;
483 int nf = a->num_filters;
484 struct btr_node *parent;
485 int i;
486
487 if (nf == 0)
488 return;
489 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
490 assert(s->fns == NULL);
491 s->fns = para_calloc(nf * sizeof(struct filter_node));
492 parent = s->receiver_node->btrn;
493 for (i = 0; i < nf; i++) {
494 struct filter *f = filters + a->filter_nums[i];
495 fn = s->fns + i;
496 fn->filter_num = a->filter_nums[i];
497 fn->conf = a->filter_conf[i];
498 fn->task.pre_select = f->pre_select;
499 fn->task.post_select = f->post_select;
500 fn->btrn = btr_new_node(&(struct btr_node_description)
501 EMBRACE(.name = f->name, .parent = parent,
502 .handler = f->execute, .context = fn));
503
504 f->open(fn);
505 register_task(&sched, &fn->task);
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 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
510 }
511 }
512
513 static void open_writers(struct slot_info *s)
514 {
515 int i;
516 struct audio_format_info *a = afi + s->format;
517 struct writer_node *wn;
518 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
519
520 assert(s->wns == NULL);
521 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
522 * sizeof(struct writer_node));
523 for (i = 0; i < a->num_writers; i++) {
524 wn = s->wns + i;
525 wn->conf = a->writer_conf[i];
526 wn->writer_num = a->writer_nums[i];
527 register_writer_node(wn, parent, &sched);
528 PARA_NOTICE_LOG("%s writer started in slot %d\n",
529 writer_names[a->writer_nums[i]], (int)(s - slot));
530 }
531 }
532
533 /* returns slot num on success */
534 static int open_receiver(int format)
535 {
536 struct audio_format_info *a = &afi[format];
537 struct slot_info *s;
538 int ret, slot_num;
539 struct receiver *r = a->receiver;
540 struct receiver_node *rn;
541
542 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
543 ret = get_empty_slot();
544 if (ret < 0)
545 return ret;
546 slot_num = ret;
547 rn = para_calloc(sizeof(*rn));
548 rn->receiver = r;
549 rn->conf = a->receiver_conf;
550 rn->btrn = btr_new_node(&(struct btr_node_description)
551 EMBRACE(.name = r->name, .context = rn));
552 ret = r->open(rn);
553 if (ret < 0) {
554 btr_remove_node(&rn->btrn);
555 free(rn);
556 return ret;
557 }
558 s = &slot[slot_num];
559 s->format = format;
560 s->receiver_node = rn;
561 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
562 audio_formats[format], r->name, slot_num);
563 rn->task.pre_select = r->pre_select;
564 rn->task.post_select = r->post_select;
565 sprintf(rn->task.status, "%s receiver node", r->name);
566 register_task(&sched, &rn->task);
567 return slot_num;
568 }
569
570 static bool receiver_running(void)
571 {
572 int i;
573 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
574
575 FOR_EACH_SLOT(i) {
576 struct slot_info *s = &slot[i];
577 long unsigned ss2 = s->server_stream_start.tv_sec;
578
579 if (!s->receiver_node)
580 continue;
581 if (s->receiver_node->task.error >= 0)
582 return true;
583 if (ss1 == ss2)
584 return true;
585 }
586 return false;
587 }
588
589 /**
590 * Return the root node of the current buffer tree.
591 *
592 * This is only used for stream grabbing.
593 *
594 * \return \p NULL if no slot is currently active. If more than one buffer tree
595 * exists, the node corresponding to the most recently started receiver is
596 * returned.
597 */
598 struct btr_node *audiod_get_btr_root(void)
599 {
600 int i, newest_slot = -1;
601 struct timeval newest_rstime = {0, 0};
602
603 FOR_EACH_SLOT(i) {
604 struct slot_info *s = &slot[i];
605 struct timeval rstime;
606 if (!s->receiver_node)
607 continue;
608 if (s->receiver_node->task.error < 0)
609 continue;
610 btr_get_node_start(s->receiver_node->btrn, &rstime);
611 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
612 continue;
613 newest_rstime = rstime;
614 newest_slot = i;
615 }
616 if (newest_slot == -1)
617 return NULL;
618 return slot[newest_slot].receiver_node->btrn;
619 }
620
621 /* whether a new instance of a decoder should be started. */
622 static bool must_start_decoder(void)
623 {
624 int cafn = stat_task->current_audio_format_num;
625 unsigned vs = stat_task->vss_status;
626
627 if (audiod_status != AUDIOD_ON)
628 return false;
629 if (cafn < 0)
630 return false;
631 if (!stat_task->ct)
632 return false;
633 if (vs & VSS_STATUS_FLAG_NEXT)
634 return false;
635 if (!(vs & VSS_STATUS_FLAG_PLAYING))
636 return false;
637 if (receiver_running())
638 return false;
639 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
640 return false;
641 return true;
642 }
643
644 static void compute_time_diff(const struct timeval *status_time)
645 {
646 struct timeval tmp, diff;
647 static unsigned count;
648 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
649 const struct timeval max_deviation = {0, 500 * 1000};
650 const int time_smooth = 5;
651
652 if (!status_time)
653 return;
654 sign = tv_diff(status_time, now, &diff);
655 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
656 // sign, sa_time_diff_sign);
657 if (!count) {
658 sa_time_diff_sign = sign;
659 stat_task->sa_time_diff = diff;
660 count++;
661 goto out;
662 }
663 if (count > 5) {
664 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
665 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
666 PARA_WARNING_LOG("time diff jump: %lims\n",
667 s * tv2ms(&tmp));
668 }
669 count++;
670 sa_time_diff_sign = tv_convex_combination(
671 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
672 count > 10? sign : sign * time_smooth, &diff,
673 &tmp);
674 stat_task->sa_time_diff = tmp;
675 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
676 sign < 0? "-" : "+",
677 tv2ms(&diff),
678 sa_time_diff_sign < 0? "-" : "+",
679 tv2ms(&stat_task->sa_time_diff)
680 );
681 out:
682 stat_task->sa_time_diff_sign = sa_time_diff_sign;
683 }
684
685 static int update_item(int itemnum, char *buf)
686 {
687 long unsigned sec, usec;
688
689 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
690 return 1;
691 free(stat_item_values[itemnum]);
692 stat_item_values[itemnum] = para_strdup(buf);
693 stat_client_write_item(itemnum);
694 switch (itemnum) {
695 case SI_STATUS_FLAGS:
696 stat_task->vss_status = 0;
697 if (strchr(buf, 'N'))
698 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
699 if (strchr(buf, 'P'))
700 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
701 break;
702 case SI_OFFSET:
703 stat_task->offset_seconds = atoi(buf);
704 break;
705 case SI_SECONDS_TOTAL:
706 stat_task->length_seconds = atoi(buf);
707 break;
708 case SI_STREAM_START:
709 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
710 stat_task->server_stream_start.tv_sec = sec;
711 stat_task->server_stream_start.tv_usec = usec;
712 }
713 break;
714 case SI_CURRENT_TIME:
715 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
716 struct timeval tv = {sec, usec};
717 compute_time_diff(&tv);
718 }
719 break;
720 case SI_FORMAT:
721 stat_task->current_audio_format_num
722 = get_audio_format_num(buf);
723 }
724 return 1;
725 }
726
727 static int parse_stream_command(const char *txt, char **cmd)
728 {
729 int ret, len;
730 char *re, *p = strchr(txt, ':');
731
732 if (!p)
733 return -E_MISSING_COLON;
734 *cmd = p + 1;
735 len = p - txt;
736 re = malloc(len + 1);
737 strncpy(re, txt, len);
738 re[len] = '\0';
739 ret = get_matching_audio_format_nums(re);
740 free(re);
741 return ret;
742 }
743
744 static int add_filter(int format, char *cmdline)
745 {
746 struct audio_format_info *a = &afi[format];
747 int filter_num, nf = a->num_filters;
748 void *cfg;
749
750 filter_num = check_filter_arg(cmdline, &cfg);
751 if (filter_num < 0)
752 return filter_num;
753 a->filter_conf = para_realloc(a->filter_conf,
754 (nf + 1) * sizeof(void *));
755 a->filter_nums = para_realloc(a->filter_nums,
756 (nf + 1) * sizeof(unsigned));
757 a->filter_nums[nf] = filter_num;
758 a->filter_conf[nf] = cfg;
759 a->num_filters++;
760 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
761 filters[filter_num].name);
762 return filter_num;
763 }
764
765 static int parse_writer_args(void)
766 {
767 int i, ret;
768 char *cmd;
769 struct audio_format_info *a;
770
771 for (i = 0; i < conf.writer_given; i++) {
772 void *wconf;
773 int j, nw, writer_num, af_mask;
774
775 ret = parse_stream_command(conf.writer_arg[i], &cmd);
776 if (ret < 0)
777 return ret;
778 af_mask = ret;
779 FOR_EACH_AUDIO_FORMAT(j) {
780 a = afi + j;
781 if ((af_mask & (1 << j)) == 0) /* no match */
782 continue;
783 wconf = check_writer_arg_or_die(cmd, &writer_num);
784 nw = a->num_writers;
785 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
786 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
787 a->writer_nums[nw] = writer_num;
788 a->writer_conf[nw] = wconf;
789 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
790 nw, writer_names[writer_num]);
791 a->num_writers++;
792 }
793 }
794 /* Use default writer for audio formats which are not yet set up. */
795 FOR_EACH_AUDIO_FORMAT(i) {
796 void *writer_conf;
797 int writer_num;
798 a = afi + i;
799 if (a->num_writers > 0)
800 continue; /* already set up */
801 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
802 a->writer_nums = para_malloc(sizeof(int));
803 a->writer_nums[0] = writer_num;
804 a->writer_conf = para_malloc(sizeof(void *));
805 a->writer_conf[0] = writer_conf;
806 a->num_writers = 1;
807 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
808 writer_names[writer_num]);
809 }
810 return 1;
811 }
812
813 static int parse_receiver_args(void)
814 {
815 int i, ret, receiver_num;
816 char *cmd = NULL;
817 struct audio_format_info *a;
818
819 for (i = conf.receiver_given - 1; i >= 0; i--) {
820 char *arg;
821 int j, af_mask;
822
823 ret = parse_stream_command(conf.receiver_arg[i], &arg);
824 if (ret < 0)
825 goto out;
826 af_mask = ret;
827 FOR_EACH_AUDIO_FORMAT(j) {
828 a = afi + j;
829 if ((af_mask & (1 << j)) == 0) /* no match */
830 continue;
831 /*
832 * If multiple receivers are given for this audio format, the
833 * last one wins and we have to free the previous receiver
834 * config here. Since we are iterating backwards, the winning
835 * receiver arg is in fact the first one given.
836 */
837 if (a->receiver_conf)
838 a->receiver->free_config(a->receiver_conf);
839 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
840 ret = -E_RECV_SYNTAX;
841 if (!a->receiver_conf)
842 goto out;
843 a->receiver = receivers + receiver_num;
844 }
845 }
846 /*
847 * Use the first available receiver with no arguments for those audio
848 * formats for which no receiver was specified.
849 */
850 cmd = para_strdup(receivers[0].name);
851 FOR_EACH_AUDIO_FORMAT(i) {
852 a = &afi[i];
853 if (a->receiver_conf)
854 continue;
855 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
856 if (!a->receiver_conf)
857 return -E_RECV_SYNTAX;
858 a->receiver = &receivers[receiver_num];
859 }
860 FOR_EACH_AUDIO_FORMAT(i) {
861 a = afi + i;
862 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
863 audio_formats[i], a->receiver->name);
864 }
865 ret = 1;
866 out:
867 free(cmd);
868 return ret;
869 }
870
871 static int init_default_filters(void)
872 {
873 int i, ret = 1;
874
875 FOR_EACH_AUDIO_FORMAT(i) {
876 struct audio_format_info *a = &afi[i];
877 char *tmp;
878 int j;
879
880 if (a->num_filters)
881 continue; /* no default -- nothing to to */
882 /*
883 * udp and dccp streams are fec-encoded, so add fecdec as the
884 * first filter.
885 */
886 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
887 strcmp(afi[i].receiver->name, "dccp") == 0) {
888 tmp = para_strdup("fecdec");
889 add_filter(i, tmp);
890 free(tmp);
891 if (ret < 0)
892 goto out;
893 }
894 /* add "dec" to audio format name */
895 tmp = make_message("%sdec", audio_formats[i]);
896 for (j = 0; filters[j].name; j++)
897 if (!strcmp(tmp, filters[j].name))
898 break;
899 free(tmp);
900 ret = -E_UNSUPPORTED_FILTER;
901 if (!filters[j].name)
902 goto out;
903 tmp = para_strdup(filters[j].name);
904 ret = add_filter(i, tmp);
905 free(tmp);
906 if (ret < 0)
907 goto out;
908 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
909 filters[j].name);
910 }
911 out:
912 return ret;
913 }
914
915 static int parse_filter_args(void)
916 {
917 int i, j, ret, af_mask, num_matches;
918
919 for (i = 0; i < conf.filter_given; i++) {
920 char *arg;
921 ret = parse_stream_command(conf.filter_arg[i], &arg);
922 if (ret < 0)
923 goto out;
924 af_mask = ret;
925 num_matches = 0;
926 FOR_EACH_AUDIO_FORMAT(j) {
927 if ((af_mask & (1 << j)) == 0) /* no match */
928 continue;
929 ret = add_filter(j, arg);
930 if (ret < 0)
931 goto out;
932 num_matches++;
933 }
934 if (num_matches == 0)
935 PARA_WARNING_LOG("ignoring filter spec: %s\n",
936 conf.filter_arg[i]);
937 }
938 ret = init_default_filters(); /* use default values for the rest */
939 out:
940 return ret;
941 }
942
943 static int parse_stream_args(void)
944 {
945 int ret;
946
947 ret = parse_receiver_args();
948 if (ret < 0)
949 return ret;
950 ret = parse_filter_args();
951 if (ret < 0)
952 return ret;
953 ret = parse_writer_args();
954 if (ret < 0)
955 return ret;
956 return 1;
957 }
958
959 /* does not unlink socket on errors */
960 static int audiod_get_socket(void)
961 {
962 struct sockaddr_un unix_addr;
963 int ret, fd;
964
965 if (conf.socket_given)
966 socket_name = para_strdup(conf.socket_arg);
967 else {
968 char *hn = para_hostname();
969 socket_name = make_message("/var/paraslash/audiod_socket.%s",
970 hn);
971 free(hn);
972 }
973 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
974 if (conf.force_given)
975 unlink(socket_name);
976 ret = create_local_socket(socket_name, &unix_addr,
977 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
978 if (ret < 0)
979 goto err;
980 fd = ret;
981 if (listen(fd , 5) < 0) {
982 ret = -ERRNO_TO_PARA_ERROR(errno);
983 goto err;
984 }
985 ret = mark_fd_nonblocking(fd);
986 if (ret < 0)
987 goto err;
988 return fd;
989 err:
990 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
991 exit(EXIT_FAILURE);
992 }
993
994 static void signal_pre_select(struct sched *s, struct task *t)
995 {
996 struct signal_task *st = container_of(t, struct signal_task, task);
997 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
998 }
999
1000 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1001 {
1002 int signum;
1003
1004 signum = para_next_signal(&s->rfds);
1005 switch (signum) {
1006 case SIGINT:
1007 case SIGTERM:
1008 case SIGHUP:
1009 PARA_NOTICE_LOG("received signal %d\n", signum);
1010 clean_exit(EXIT_FAILURE, "caught deadly signal");
1011 }
1012 return 0;
1013 }
1014
1015 static void signal_setup_default(struct signal_task *st)
1016 {
1017 st->task.pre_select = signal_pre_select;
1018 st->task.post_select = signal_post_select;
1019 sprintf(st->task.status, "signal task");
1020 }
1021
1022 static void command_pre_select(struct sched *s, struct task *t)
1023 {
1024 struct command_task *ct = container_of(t, struct command_task, task);
1025 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1026 }
1027
1028 static int command_post_select(struct sched *s, struct task *t)
1029 {
1030 int ret;
1031 struct command_task *ct = container_of(t, struct command_task, task);
1032 static struct timeval last_status_dump;
1033 struct timeval tmp, delay;
1034 bool force = true;
1035
1036 ret = handle_connect(ct->fd, &s->rfds);
1037 if (ret < 0)
1038 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1039 else if (ret > 0)
1040 goto dump;
1041
1042 /* if last status dump was less than 500ms ago, do nothing */
1043 delay.tv_sec = 0;
1044 delay.tv_usec = 500 * 1000;
1045 tv_add(&last_status_dump, &delay, &tmp);
1046 if (tv_diff(now, &tmp, NULL) < 0)
1047 return 0;
1048
1049 /*
1050 * If last status dump was more than 5s ago, force update. Otherwise,
1051 * update only those items that have changed.
1052 */
1053 delay.tv_sec = 5;
1054 delay.tv_usec = 0;
1055 tv_add(&last_status_dump, &delay, &tmp);
1056 if (tv_diff(now, &tmp, NULL) < 0)
1057 force = false;
1058 dump:
1059 audiod_status_dump(force);
1060 last_status_dump = *now;
1061 return 1;
1062 }
1063
1064 static void init_command_task(struct command_task *ct)
1065 {
1066 ct->task.pre_select = command_pre_select;
1067 ct->task.post_select = command_post_select;
1068 ct->task.error = 0;
1069 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1070 sprintf(ct->task.status, "command task");
1071 }
1072
1073 static void close_stat_pipe(void)
1074 {
1075 if (!stat_task->ct)
1076 return;
1077 client_close(stat_task->ct);
1078 stat_task->ct = NULL;
1079 clear_and_dump_items();
1080 stat_task->length_seconds = 0;
1081 stat_task->offset_seconds = 0;
1082 stat_task->vss_status = 0;
1083 stat_task->current_audio_format_num = -1;
1084 audiod_status_dump(true);
1085 }
1086
1087 /* avoid busy loop if server is down */
1088 static void set_stat_task_restart_barrier(unsigned seconds)
1089 {
1090 struct timeval delay = {seconds, 0};
1091 tv_add(now, &delay, &stat_task->restart_barrier);
1092 }
1093
1094 static bool must_close_slot(int slot_num)
1095 {
1096 struct slot_info *s = &slot[slot_num];
1097 struct audio_format_info *a = afi + s->format;
1098 int i;
1099
1100 if (s->format < 0)
1101 return false;
1102 if (s->receiver_node && s->receiver_node->task.error >= 0)
1103 return false;
1104 for (i = 0; i < a->num_filters; i++)
1105 if (s->fns && s->fns[i].task.error >= 0)
1106 return false;
1107 if (a->num_writers > 0) {
1108 for (i = 0; i < a->num_writers; i++)
1109 if (s->wns && s->wns[i].task.error >= 0)
1110 return false;
1111 } else {
1112 if (s->wns && s->wns[0].task.error >= 0)
1113 return false;
1114 }
1115 return true;
1116 }
1117
1118 static void close_slot(int slot_num)
1119 {
1120 struct slot_info *s = slot + slot_num;
1121
1122 PARA_INFO_LOG("closing slot %d\n", slot_num);
1123 close_writers(s);
1124 close_filters(s);
1125 close_receiver(slot_num);
1126 clear_slot(slot_num);
1127 }
1128
1129 static void close_unused_slots(void)
1130 {
1131 int i;
1132
1133 FOR_EACH_SLOT(i)
1134 if (must_close_slot(i))
1135 close_slot(i);
1136 }
1137
1138 /**
1139 * Close the connection to para_server and exit.
1140 *
1141 * \param status The exit status which is passed to exit(3).
1142 * \param msg The log message
1143 *
1144 * Log \a msg with loglevel \p EMERG, close the connection to para_server and
1145 * all slots, and call \p exit(status). \a status should be either EXIT_SUCCESS
1146 * or EXIT_FAILURE.
1147 *
1148 * \sa exit(3).
1149 */
1150 void __noreturn clean_exit(int status, const char *msg)
1151 {
1152 int i;
1153
1154 if (socket_name)
1155 unlink(socket_name);
1156 close_stat_pipe();
1157 FOR_EACH_SLOT(i)
1158 close_slot(i);
1159 audiod_cmdline_parser_free(&conf);
1160 close_stat_clients();
1161 PARA_EMERG_LOG("%s\n", msg);
1162 exit(status);
1163 }
1164
1165 /*
1166 * Check if any receivers/filters/writers need to be started and do so if
1167 * necessary.
1168 */
1169 static void start_stop_decoders(void)
1170 {
1171 int ret;
1172 struct slot_info *sl;
1173 struct audio_format_info *a;
1174
1175 close_unused_slots();
1176 if (audiod_status != AUDIOD_ON ||
1177 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1178 return notify_receivers(E_NOT_PLAYING);
1179 if (!must_start_decoder())
1180 return;
1181 ret = open_receiver(stat_task->current_audio_format_num);
1182 if (ret < 0) {
1183 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1184 return;
1185 }
1186 sl = slot + ret;
1187 a = afi + sl->format;
1188 if (a->num_filters)
1189 open_filters(sl);
1190 open_writers(sl);
1191 activate_grab_clients(&sched);
1192 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1193 }
1194
1195 static void status_pre_select(struct sched *s, struct task *t)
1196 {
1197 struct status_task *st = container_of(t, struct status_task, task);
1198 int i, ret, cafn = stat_task->current_audio_format_num;
1199
1200 if (must_start_decoder())
1201 goto min_delay;
1202 FOR_EACH_SLOT(i)
1203 if (must_close_slot(i))
1204 goto min_delay;
1205 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1206 if (ret > 0)
1207 goto min_delay;
1208 if (st->ct && audiod_status == AUDIOD_OFF)
1209 goto min_delay;
1210 if (!st->ct && audiod_status != AUDIOD_OFF)
1211 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1212 if (cafn >= 0)
1213 sched_request_barrier(&afi[cafn].restart_barrier, s);
1214 /*
1215 * If para_server is playing we'd like to have a smooth time display
1216 * even if we are running in standby mode. So we request a timeout that
1217 * expires at the next full second.
1218 */
1219 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1220 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1221 return;
1222 min_delay:
1223 sched_min_delay(s);
1224 }
1225
1226 /* restart the client task if necessary */
1227 static int status_post_select(struct sched *s, struct task *t)
1228 {
1229 struct status_task *st = container_of(t, struct status_task, task);
1230
1231 if (audiod_status == AUDIOD_OFF) {
1232 if (!st->ct)
1233 goto out;
1234 if (st->ct->task.error >= 0) {
1235 task_notify(&st->ct->task, E_AUDIOD_OFF);
1236 goto out;
1237 }
1238 close_stat_pipe();
1239 st->clock_diff_count = conf.clock_diff_count_arg;
1240 goto out;
1241 }
1242 if (st->ct) {
1243 char *buf;
1244 size_t sz;
1245 int ret;
1246
1247 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1248 if (ret < 0) {
1249 close_stat_pipe();
1250 goto out;
1251 }
1252 if (st->ct->status != CL_EXECUTING)
1253 goto out;
1254 if (ret == 0) {
1255 struct timeval diff;
1256 tv_diff(now, &st->last_status_read, &diff);
1257 if (diff.tv_sec > 61)
1258 task_notify(&st->ct->task, E_STATUS_TIMEOUT);
1259 goto out;
1260 }
1261 btr_merge(st->btrn, st->min_iqs);
1262 sz = btr_next_buffer(st->btrn, &buf);
1263 ret = for_each_stat_item(buf, sz, update_item);
1264 if (ret < 0) {
1265 task_notify(&st->ct->task, -ret);
1266 goto out;
1267 }
1268 if (sz != ret) {
1269 btr_consume(st->btrn, sz - ret);
1270 st->last_status_read = *now;
1271 st->min_iqs = 0;
1272 } else /* current status item crosses buffers */
1273 st->min_iqs = sz + 1;
1274 goto out;
1275 }
1276 btr_drain(st->btrn);
1277 st->current_audio_format_num = -1;
1278 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1279 goto out;
1280 if (st->clock_diff_count) { /* get status only one time */
1281 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1282 int argc = 5;
1283 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1284 st->clock_diff_count--;
1285 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1286 set_stat_task_restart_barrier(2);
1287
1288 } else {
1289 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1290 int argc = 4;
1291 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1292 set_stat_task_restart_barrier(5);
1293 }
1294 free(stat_item_values[SI_BASENAME]);
1295 stat_item_values[SI_BASENAME] = para_strdup(
1296 "no connection to para_server");
1297 stat_client_write_item(SI_BASENAME);
1298 st->last_status_read = *now;
1299 out:
1300 start_stop_decoders();
1301 return 0;
1302 }
1303
1304 static void init_status_task(struct status_task *st)
1305 {
1306 memset(st, 0, sizeof(struct status_task));
1307 st->task.pre_select = status_pre_select;
1308 st->task.post_select = status_post_select;
1309 st->sa_time_diff_sign = 1;
1310 st->clock_diff_count = conf.clock_diff_count_arg;
1311 st->current_audio_format_num = -1;
1312 sprintf(st->task.status, "stat");
1313 st->btrn = btr_new_node(&(struct btr_node_description)
1314 EMBRACE(.name = "stat"));
1315 }
1316
1317 static void set_initial_status(void)
1318 {
1319 audiod_status = AUDIOD_ON;
1320 if (!conf.mode_given)
1321 return;
1322 if (!strcmp(conf.mode_arg, "sb")) {
1323 audiod_status = AUDIOD_STANDBY;
1324 return;
1325 }
1326 if (!strcmp(conf.mode_arg, "off")) {
1327 audiod_status = AUDIOD_OFF;
1328 return;
1329 }
1330 if (strcmp(conf.mode_arg, "on"))
1331 PARA_WARNING_LOG("invalid mode\n");
1332 }
1333
1334 __noreturn static void print_help_and_die(void)
1335 {
1336 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1337 bool d = conf.detailed_help_given;
1338 unsigned flags;
1339
1340 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1341 ggo_print_help(&h, flags);
1342
1343 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1344 print_receiver_helps(flags);
1345 print_filter_helps(flags);
1346 print_writer_helps(flags);
1347 exit(0);
1348 }
1349
1350 static void init_colors_or_die(void)
1351 {
1352 int i;
1353
1354 if (!want_colors())
1355 return;
1356 daemon_set_default_log_colors();
1357 daemon_set_flag(DF_COLOR_LOG);
1358 for (i = 0; i < conf.log_color_given; i++)
1359 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1360 }
1361
1362 /**
1363 * the main function of para_audiod
1364 *
1365 * \param argc usual argument count
1366 * \param argv usual argument vector
1367 *
1368 * \return EXIT_SUCCESS or EXIT_FAILURE
1369 *
1370 * \sa para_audiod(1)
1371 * */
1372 int main(int argc, char *argv[])
1373 {
1374 int ret, i;
1375 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1376 struct audiod_cmdline_parser_params params = {
1377 .override = 0,
1378 .initialize = 1,
1379 .check_required = 0,
1380 .check_ambiguity = 0,
1381 .print_errors = 1
1382 };
1383
1384 valid_fd_012();
1385 audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1386 daemon_set_loglevel(conf.loglevel_arg);
1387 version_handle_flag("audiod", conf.version_given);
1388 /* init receivers/filters/writers early to make help work */
1389 recv_init();
1390 filter_init();
1391 writer_init();
1392 if (conf.help_given || conf.detailed_help_given)
1393 print_help_and_die();
1394 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1395 parse_config_or_die();
1396 init_colors_or_die();
1397 init_random_seed_or_die();
1398 daemon_set_flag(DF_LOG_TIME);
1399 daemon_set_flag(DF_LOG_HOSTNAME);
1400 daemon_set_flag(DF_LOG_LL);
1401 if (conf.log_timing_given)
1402 daemon_set_flag(DF_LOG_TIMING);
1403 if (conf.logfile_given) {
1404 daemon_set_logfile(conf.logfile_arg);
1405 daemon_open_log_or_die();
1406 }
1407 ret = parse_stream_args();
1408 if (ret < 0) {
1409 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1410 exit(EXIT_FAILURE);
1411 }
1412 log_welcome("para_audiod");
1413 set_server_start_time(NULL);
1414 set_initial_status();
1415 FOR_EACH_SLOT(i)
1416 clear_slot(i);
1417 setup_signal_handling();
1418 signal_setup_default(sig_task);
1419
1420 init_status_task(stat_task);
1421 init_command_task(cmd_task);
1422
1423 if (conf.daemon_given)
1424 daemonize(false /* parent exits immediately */);
1425
1426 register_task(&sched, &sig_task->task);
1427 register_task(&sched, &cmd_task->task);
1428 register_task(&sched, &stat_task->task);
1429 sched.default_timeout.tv_sec = 2;
1430 sched.default_timeout.tv_usec = 999 * 1000;
1431 ret = schedule(&sched);
1432
1433 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1434 return EXIT_FAILURE;
1435 }