task_register() conversion: writers
[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
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 /**
97 * The task for obtaining para_server's status (para_client stat).
98 *
99 * \sa struct task, struct sched.
100 */
101 struct status_task {
102 /** The associated task structure of audiod. */
103 struct task task;
104 /** Client data associated with the stat task. */
105 struct client_task *ct;
106 /** Do not restart client command until this time. */
107 struct timeval restart_barrier;
108 /** Last time we received status data from para_server. */
109 struct timeval last_status_read;
110 size_t min_iqs;
111 /** The offset value announced by para_server. */
112 int offset_seconds;
113 /** The length of the current audio file as announced by para_server. */
114 int length_seconds;
115 /** The start of the current stream from the view of para_server. */
116 struct timeval server_stream_start;
117 /** The average time deviation between para_server and para_audiod. */
118 struct timeval sa_time_diff;
119 /** Whether client time is ahead of server time. */
120 int sa_time_diff_sign;
121 /** The 'P' and the 'N' flags as announced by para_server. */
122 enum vss_status_flags vss_status;
123 /** Number of times the clock difference is to be checked. */
124 unsigned clock_diff_count;
125 /** When to start the next check for clock difference. */
126 struct timeval clock_diff_barrier;
127 /** Number of the audio format as announced by para_server. */
128 int current_audio_format_num;
129 /* The status task btrn is the child of the client task. */
130 struct btr_node *btrn;
131 };
132
133 /** The array of status items sent by para_server. */
134 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
135
136 /**
137 * the current mode of operation of which can be changed by the on/off/cycle
138 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
139 */
140 int audiod_status = AUDIOD_ON;
141
142 /**
143 * the gengetopt args_info struct that holds information on all command line
144 * arguments
145 */
146 struct audiod_args_info conf;
147
148 static char *socket_name;
149 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
150
151 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
152
153 static struct status_task status_task_struct;
154
155 /**
156 * the task that calls the status command of para_server
157 *
158 * \sa struct status_task
159 */
160 static struct status_task *stat_task = &status_task_struct;
161
162 /**
163 * the task for handling audiod commands
164 *
165 * \sa struct task, struct sched
166 */
167 struct command_task {
168 /** the local listening socket */
169 int fd;
170 /** the associated task structure */
171 struct task task;
172 };
173
174 /** iterate over all supported audio formats */
175 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
176
177 /**
178 * Get the audio format number.
179 *
180 * \param name The name of the audio format.
181 *
182 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
183 * \a name is not a supported audio format.
184 */
185 static int get_audio_format_num(const char *name)
186 {
187 int i;
188
189 while (para_isspace(*name))
190 name++;
191 FOR_EACH_AUDIO_FORMAT(i)
192 if (!strcmp(name, audio_formats[i]))
193 return i;
194 return -E_UNSUPPORTED_AUDIO_FORMAT;
195 }
196
197 static int get_matching_audio_format_nums(const char *re)
198 {
199 int i, ret;
200 regex_t preg;
201
202 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
203 if (ret < 0)
204 return ret;
205 ret = 0;
206 FOR_EACH_AUDIO_FORMAT(i)
207 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
208 ret |= (1 << i);
209 regfree(&preg);
210 return ret;
211 }
212
213 /**
214 * Compute the play time based on information of the given slot.
215 *
216 * \param slot_num The slot number (negative means: no slot).
217 *
218 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
219 * from the status items received from para_server and the start time of the
220 * (first) writer of the given slot.
221 *
222 * It has to take into account that the stream was probably not started at
223 * the beginning of the file, that the clock between the server and the client
224 * host may differ and that playback of the stream was delayed, e.g. because
225 * the prebuffer filter is used in the filter configuration of the given slot.
226 *
227 * If no writer is active in the given slot, or \a slot_num is negative
228 * (indicating that para_audiod runs in standby mode), an approximation based
229 * only on the status items is computed and the returned string is prefixed
230 * with "~".
231 *
232 * \return A string that must be freed by the caller.
233 */
234 char *get_time_string(int slot_num)
235 {
236 int ret, seconds = 0, length;
237 struct timeval *tmp, sum, sss, /* server stream start */
238 rstime, /* receiver start time */
239 wstime, /* writer start time */
240 wtime, /* now - writer start */
241 rskip; /* receiver start - sss */
242 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
243 char *msg;
244
245 if (audiod_status == AUDIOD_OFF)
246 goto empty;
247 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
248 if (stat_task->length_seconds) /* paused */
249 return NULL;
250 goto empty; /* stopped */
251 }
252 if (audiod_status == AUDIOD_ON && !s)
253 goto empty;
254 /*
255 * Valid status items and playing, set length and tmp to the stream
256 * start. We use the slot info and fall back to the info from current
257 * status items if no slot info is available.
258 */
259 length = stat_task->length_seconds;
260 tmp = &stat_task->server_stream_start;
261 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
262 btr_get_node_start(s->wns[0].btrn, &wstime);
263 if (wstime.tv_sec != 0) { /* writer wrote something */
264 if (s->server_stream_start.tv_sec == 0) {
265 /* copy status info to slot */
266 s->server_stream_start = stat_task->server_stream_start;
267 s->offset_seconds = stat_task->offset_seconds;
268 s->seconds_total = stat_task->length_seconds;
269 }
270 length = s->seconds_total;
271 tmp = &s->server_stream_start;
272 }
273 }
274 if (stat_task->sa_time_diff_sign > 0)
275 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
276 else
277 tv_add(tmp, &stat_task->sa_time_diff, &sss);
278 if (!s || !s->wns || !s->wns[0].btrn) {
279 struct timeval diff;
280 tv_diff(now, &sss, &diff);
281 seconds = diff.tv_sec + stat_task->offset_seconds;
282 goto out;
283 }
284 tv_diff(now, &wstime, &wtime);
285 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
286 seconds = s->offset_seconds;
287 if (s->receiver_node->btrn) {
288 btr_get_node_start(s->receiver_node->btrn, &rstime);
289 ret = tv_diff(&rstime, &sss, &rskip);
290 if (ret > 0) { /* audiod was started in the middle of the stream */
291 tv_add(&wtime, &rskip, &sum);
292 seconds += sum.tv_sec;
293 } else
294 seconds += wtime.tv_sec;
295 } else
296 seconds += wtime.tv_sec;
297 out:
298 seconds = PARA_MIN(seconds, length);
299 seconds = PARA_MAX(seconds, 0);
300 msg = make_message(
301 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
302 s? "" : "~",
303 seconds / 60,
304 seconds % 60,
305 (length - seconds) / 60,
306 (length - seconds) % 60,
307 length? (seconds * 100 + length / 2) / length : 0,
308 length / 60,
309 length % 60
310 );
311 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
312 return msg;
313 empty:
314 return para_strdup(NULL);
315 }
316
317 static int want_colors(void)
318 {
319 if (conf.color_arg == color_arg_no)
320 return 0;
321 if (conf.color_arg == color_arg_yes)
322 return 1;
323 if (conf.logfile_given)
324 return 0;
325 return isatty(STDERR_FILENO);
326 }
327
328 static void parse_config_or_die(void)
329 {
330 int ret;
331 char *config_file;
332 struct audiod_cmdline_parser_params params = {
333 .override = 0,
334 .initialize = 0,
335 .check_required = 1,
336 .check_ambiguity = 0,
337 .print_errors = 1
338 };
339
340 if (conf.config_file_given)
341 config_file = para_strdup(conf.config_file_arg);
342 else {
343 char *home = para_homedir();
344 config_file = make_message("%s/.paraslash/audiod.conf", home);
345 free(home);
346 }
347 ret = file_exists(config_file);
348 if (conf.config_file_given && !ret) {
349 PARA_EMERG_LOG("can not read config file %s\n", config_file);
350 goto err;
351 }
352 if (ret) {
353 audiod_cmdline_parser_config_file(config_file, &conf, &params);
354 daemon_set_loglevel(conf.loglevel_arg);
355 }
356 free(config_file);
357 return;
358 err:
359 free(config_file);
360 exit(EXIT_FAILURE);
361 }
362
363 static void setup_signal_handling(void)
364 {
365 sig_task->fd = para_signal_init();
366 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
367 para_install_sighandler(SIGINT);
368 para_install_sighandler(SIGTERM);
369 para_install_sighandler(SIGHUP);
370 para_sigaction(SIGPIPE, SIG_IGN);
371 }
372
373 static void clear_slot(int slot_num)
374 {
375 struct slot_info *s = &slot[slot_num];
376
377 PARA_INFO_LOG("clearing slot %d\n", slot_num);
378 memset(s, 0, sizeof(struct slot_info));
379 s->format = -1;
380 }
381
382 static void close_receiver(int slot_num)
383 {
384 struct slot_info *s = &slot[slot_num];
385 struct audio_format_info *a;
386
387 if (s->format < 0 || !s->receiver_node)
388 return;
389 a = &afi[s->format];
390 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
391 audio_formats[s->format], slot_num);
392 a->receiver->close(s->receiver_node);
393 btr_remove_node(&s->receiver_node->btrn);
394 task_reap(&s->receiver_node->task);
395 free(s->receiver_node);
396 s->receiver_node = NULL;
397 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
398 &a->restart_barrier);
399 }
400
401 static void writer_cleanup(struct writer_node *wn)
402 {
403 struct writer *w;
404
405 if (!wn)
406 return;
407 w = writers + wn->writer_num;
408 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
409 w->close(wn);
410 btr_remove_node(&wn->btrn);
411 task_reap(&wn->task);
412 }
413
414 static void close_writers(struct slot_info *s)
415 {
416 struct audio_format_info *a;
417 int i;
418
419 if (s->format < 0)
420 return;
421 assert(s->wns);
422 a = afi + s->format;
423 if (a->num_writers == 0)
424 writer_cleanup(s->wns);
425 else {
426 for (i = 0; i < a->num_writers; i++)
427 writer_cleanup(s->wns + i);
428 }
429 free(s->wns);
430 s->wns = NULL;
431 }
432
433 static void close_filters(struct slot_info *s)
434 {
435 int i;
436 struct audio_format_info *a = afi + s->format;
437 if (a->num_filters == 0)
438 return;
439 for (i = a->num_filters - 1; i >= 0; i--) {
440 struct filter_node *fn = s->fns + i;
441 struct filter *f;
442
443 if (!fn)
444 continue;
445 f = filters + fn->filter_num;
446 if (f->close)
447 f->close(fn);
448 btr_remove_node(&fn->btrn);
449 task_reap(&fn->task);
450 }
451 free(s->fns);
452 s->fns = NULL;
453 }
454
455 static void notify_receivers(int error)
456 {
457 int i;
458
459 FOR_EACH_SLOT(i) {
460 struct slot_info *s = slot + i;
461 if (s->format < 0)
462 continue;
463 if (!s->receiver_node)
464 continue;
465 task_notify(s->receiver_node->task, error);
466 }
467 }
468
469 static int get_empty_slot(void)
470 {
471 int i;
472 struct slot_info *s;
473
474 FOR_EACH_SLOT(i) {
475 s = &slot[i];
476 if (s->format < 0) {
477 clear_slot(i);
478 return i;
479 }
480 if (s->wns || s->receiver_node || s->fns)
481 continue;
482 clear_slot(i);
483 return i;
484 }
485 return -E_NO_MORE_SLOTS;
486 }
487
488 static void open_filters(struct slot_info *s)
489 {
490 struct audio_format_info *a = afi + s->format;
491 struct filter_node *fn;
492 int nf = a->num_filters;
493 struct btr_node *parent;
494 int i;
495
496 if (nf == 0)
497 return;
498 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
499 assert(s->fns == NULL);
500 s->fns = para_calloc(nf * sizeof(struct filter_node));
501 parent = s->receiver_node->btrn;
502 for (i = 0; i < nf; i++) {
503 char buf[20];
504 struct filter *f = filters + a->filter_nums[i];
505 fn = s->fns + i;
506 fn->filter_num = a->filter_nums[i];
507 fn->conf = a->filter_conf[i];
508 fn->btrn = btr_new_node(&(struct btr_node_description)
509 EMBRACE(.name = f->name, .parent = parent,
510 .handler = f->execute, .context = fn));
511
512 f->open(fn);
513 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
514 fn->task = task_register(&(struct task_info) {
515 .name = buf,
516 .pre_select = f->pre_select,
517 .post_select = f->post_select,
518 .context = fn,
519 }, &sched);
520 parent = fn->btrn;
521 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
522 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
523 }
524 }
525
526 static void open_writers(struct slot_info *s)
527 {
528 int i;
529 struct audio_format_info *a = afi + s->format;
530 struct writer_node *wn;
531 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
532
533 assert(s->wns == NULL);
534 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
535 * sizeof(struct writer_node));
536 for (i = 0; i < a->num_writers; i++) {
537 wn = s->wns + i;
538 wn->conf = a->writer_conf[i];
539 wn->writer_num = a->writer_nums[i];
540 register_writer_node(wn, parent, &sched);
541 PARA_NOTICE_LOG("%s writer started in slot %d\n",
542 writer_names[a->writer_nums[i]], (int)(s - slot));
543 }
544 }
545
546 /* returns slot num on success */
547 static int open_receiver(int format)
548 {
549 struct audio_format_info *a = &afi[format];
550 struct slot_info *s;
551 int ret, slot_num;
552 struct receiver *r = a->receiver;
553 struct receiver_node *rn;
554
555 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
556 ret = get_empty_slot();
557 if (ret < 0)
558 return ret;
559 slot_num = ret;
560 rn = para_calloc(sizeof(*rn));
561 rn->receiver = r;
562 rn->conf = a->receiver_conf;
563 rn->btrn = btr_new_node(&(struct btr_node_description)
564 EMBRACE(.name = r->name, .context = rn));
565 ret = r->open(rn);
566 if (ret < 0) {
567 btr_remove_node(&rn->btrn);
568 free(rn);
569 return ret;
570 }
571 s = &slot[slot_num];
572 s->format = format;
573 s->receiver_node = rn;
574 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
575 audio_formats[format], r->name, slot_num);
576 rn->task = task_register(&(struct task_info) {
577 .name = r->name,
578 .pre_select = r->pre_select,
579 .post_select = r->post_select,
580 .context = rn,
581 }, &sched);
582 return slot_num;
583 }
584
585 static bool receiver_running(void)
586 {
587 int i;
588 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
589
590 FOR_EACH_SLOT(i) {
591 struct slot_info *s = &slot[i];
592 long unsigned ss2 = s->server_stream_start.tv_sec;
593
594 if (!s->receiver_node)
595 continue;
596 if (s->receiver_node->task->error >= 0)
597 return true;
598 if (ss1 == ss2)
599 return true;
600 }
601 return false;
602 }
603
604 /**
605 * Return the root node of the current buffer tree.
606 *
607 * This is only used for stream grabbing.
608 *
609 * \return \p NULL if no slot is currently active. If more than one buffer tree
610 * exists, the node corresponding to the most recently started receiver is
611 * returned.
612 */
613 struct btr_node *audiod_get_btr_root(void)
614 {
615 int i, newest_slot = -1;
616 struct timeval newest_rstime = {0, 0};
617
618 FOR_EACH_SLOT(i) {
619 struct slot_info *s = &slot[i];
620 struct timeval rstime;
621 if (!s->receiver_node)
622 continue;
623 if (s->receiver_node->task->error < 0)
624 continue;
625 btr_get_node_start(s->receiver_node->btrn, &rstime);
626 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
627 continue;
628 newest_rstime = rstime;
629 newest_slot = i;
630 }
631 if (newest_slot == -1)
632 return NULL;
633 return slot[newest_slot].receiver_node->btrn;
634 }
635
636 /* whether a new instance of a decoder should be started. */
637 static bool must_start_decoder(void)
638 {
639 int cafn = stat_task->current_audio_format_num;
640 unsigned vs = stat_task->vss_status;
641
642 if (audiod_status != AUDIOD_ON)
643 return false;
644 if (cafn < 0)
645 return false;
646 if (!stat_task->ct)
647 return false;
648 if (vs & VSS_STATUS_FLAG_NEXT)
649 return false;
650 if (!(vs & VSS_STATUS_FLAG_PLAYING))
651 return false;
652 if (receiver_running())
653 return false;
654 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
655 return false;
656 return true;
657 }
658
659 static void compute_time_diff(const struct timeval *status_time)
660 {
661 struct timeval tmp, diff;
662 static unsigned count;
663 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
664 const struct timeval max_deviation = {0, 500 * 1000};
665 const int time_smooth = 5;
666
667 sign = tv_diff(status_time, now, &diff);
668 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
669 // sign, sa_time_diff_sign);
670 if (!count) {
671 sa_time_diff_sign = sign;
672 stat_task->sa_time_diff = diff;
673 count++;
674 goto out;
675 }
676 if (count > 5) {
677 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
678 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
679 PARA_WARNING_LOG("time diff jump: %lims\n",
680 s * tv2ms(&tmp));
681 }
682 count++;
683 sa_time_diff_sign = tv_convex_combination(
684 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
685 count > 10? sign : sign * time_smooth, &diff,
686 &tmp);
687 stat_task->sa_time_diff = tmp;
688 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
689 sign < 0? "-" : "+",
690 tv2ms(&diff),
691 sa_time_diff_sign < 0? "-" : "+",
692 tv2ms(&stat_task->sa_time_diff)
693 );
694 out:
695 stat_task->sa_time_diff_sign = sa_time_diff_sign;
696 }
697
698 static int update_item(int itemnum, char *buf)
699 {
700 long unsigned sec, usec;
701
702 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
703 return 1;
704 free(stat_item_values[itemnum]);
705 stat_item_values[itemnum] = para_strdup(buf);
706 stat_client_write_item(itemnum);
707 switch (itemnum) {
708 case SI_STATUS_FLAGS:
709 stat_task->vss_status = 0;
710 if (strchr(buf, 'N'))
711 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
712 if (strchr(buf, 'P'))
713 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
714 break;
715 case SI_OFFSET:
716 stat_task->offset_seconds = atoi(buf);
717 break;
718 case SI_SECONDS_TOTAL:
719 stat_task->length_seconds = atoi(buf);
720 break;
721 case SI_STREAM_START:
722 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
723 stat_task->server_stream_start.tv_sec = sec;
724 stat_task->server_stream_start.tv_usec = usec;
725 }
726 break;
727 case SI_CURRENT_TIME:
728 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
729 struct timeval tv = {sec, usec};
730 compute_time_diff(&tv);
731 }
732 break;
733 case SI_FORMAT:
734 stat_task->current_audio_format_num
735 = get_audio_format_num(buf);
736 }
737 return 1;
738 }
739
740 static int parse_stream_command(const char *txt, char **cmd)
741 {
742 int ret, len;
743 char *re, *p = strchr(txt, ':');
744
745 if (!p)
746 return -E_MISSING_COLON;
747 *cmd = p + 1;
748 len = p - txt;
749 re = malloc(len + 1);
750 strncpy(re, txt, len);
751 re[len] = '\0';
752 ret = get_matching_audio_format_nums(re);
753 free(re);
754 return ret;
755 }
756
757 static int add_filter(int format, char *cmdline)
758 {
759 struct audio_format_info *a = &afi[format];
760 int filter_num, nf = a->num_filters;
761 void *cfg;
762
763 filter_num = check_filter_arg(cmdline, &cfg);
764 if (filter_num < 0)
765 return filter_num;
766 a->filter_conf = para_realloc(a->filter_conf,
767 (nf + 1) * sizeof(void *));
768 a->filter_nums = para_realloc(a->filter_nums,
769 (nf + 1) * sizeof(unsigned));
770 a->filter_nums[nf] = filter_num;
771 a->filter_conf[nf] = cfg;
772 a->num_filters++;
773 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
774 filters[filter_num].name);
775 return filter_num;
776 }
777
778 static int parse_writer_args(void)
779 {
780 int i, ret;
781 char *cmd;
782 struct audio_format_info *a;
783
784 for (i = 0; i < conf.writer_given; i++) {
785 void *wconf;
786 int j, nw, writer_num, af_mask;
787
788 ret = parse_stream_command(conf.writer_arg[i], &cmd);
789 if (ret < 0)
790 return ret;
791 af_mask = ret;
792 FOR_EACH_AUDIO_FORMAT(j) {
793 a = afi + j;
794 if ((af_mask & (1 << j)) == 0) /* no match */
795 continue;
796 wconf = check_writer_arg_or_die(cmd, &writer_num);
797 nw = a->num_writers;
798 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
799 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
800 a->writer_nums[nw] = writer_num;
801 a->writer_conf[nw] = wconf;
802 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
803 nw, writer_names[writer_num]);
804 a->num_writers++;
805 }
806 }
807 /* Use default writer for audio formats which are not yet set up. */
808 FOR_EACH_AUDIO_FORMAT(i) {
809 void *writer_conf;
810 int writer_num;
811 a = afi + i;
812 if (a->num_writers > 0)
813 continue; /* already set up */
814 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
815 a->writer_nums = para_malloc(sizeof(int));
816 a->writer_nums[0] = writer_num;
817 a->writer_conf = para_malloc(sizeof(void *));
818 a->writer_conf[0] = writer_conf;
819 a->num_writers = 1;
820 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
821 writer_names[writer_num]);
822 }
823 return 1;
824 }
825
826 static int parse_receiver_args(void)
827 {
828 int i, ret, receiver_num;
829 char *cmd = NULL;
830 struct audio_format_info *a;
831
832 for (i = conf.receiver_given - 1; i >= 0; i--) {
833 char *arg;
834 int j, af_mask;
835
836 ret = parse_stream_command(conf.receiver_arg[i], &arg);
837 if (ret < 0)
838 goto out;
839 af_mask = ret;
840 FOR_EACH_AUDIO_FORMAT(j) {
841 a = afi + j;
842 if ((af_mask & (1 << j)) == 0) /* no match */
843 continue;
844 /*
845 * If multiple receivers are given for this audio format, the
846 * last one wins and we have to free the previous receiver
847 * config here. Since we are iterating backwards, the winning
848 * receiver arg is in fact the first one given.
849 */
850 if (a->receiver_conf)
851 a->receiver->free_config(a->receiver_conf);
852 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
853 ret = -E_RECV_SYNTAX;
854 if (!a->receiver_conf)
855 goto out;
856 a->receiver = receivers + receiver_num;
857 }
858 }
859 /*
860 * Use the first available receiver with no arguments for those audio
861 * formats for which no receiver was specified.
862 */
863 cmd = para_strdup(receivers[0].name);
864 FOR_EACH_AUDIO_FORMAT(i) {
865 a = &afi[i];
866 if (a->receiver_conf)
867 continue;
868 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
869 if (!a->receiver_conf)
870 return -E_RECV_SYNTAX;
871 a->receiver = &receivers[receiver_num];
872 }
873 FOR_EACH_AUDIO_FORMAT(i) {
874 a = afi + i;
875 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
876 audio_formats[i], a->receiver->name);
877 }
878 ret = 1;
879 out:
880 free(cmd);
881 return ret;
882 }
883
884 static int init_default_filters(void)
885 {
886 int i, ret = 1;
887
888 FOR_EACH_AUDIO_FORMAT(i) {
889 struct audio_format_info *a = &afi[i];
890 char *tmp;
891 int j;
892
893 if (a->num_filters)
894 continue; /* no default -- nothing to to */
895 /*
896 * udp and dccp streams are fec-encoded, so add fecdec as the
897 * first filter.
898 */
899 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
900 strcmp(afi[i].receiver->name, "dccp") == 0) {
901 tmp = para_strdup("fecdec");
902 add_filter(i, tmp);
903 free(tmp);
904 if (ret < 0)
905 goto out;
906 }
907 /* add "dec" to audio format name */
908 tmp = make_message("%sdec", audio_formats[i]);
909 for (j = 0; filters[j].name; j++)
910 if (!strcmp(tmp, filters[j].name))
911 break;
912 free(tmp);
913 ret = -E_UNSUPPORTED_FILTER;
914 if (!filters[j].name)
915 goto out;
916 tmp = para_strdup(filters[j].name);
917 ret = add_filter(i, tmp);
918 free(tmp);
919 if (ret < 0)
920 goto out;
921 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
922 filters[j].name);
923 }
924 out:
925 return ret;
926 }
927
928 static int parse_filter_args(void)
929 {
930 int i, j, ret, af_mask, num_matches;
931
932 for (i = 0; i < conf.filter_given; i++) {
933 char *arg;
934 ret = parse_stream_command(conf.filter_arg[i], &arg);
935 if (ret < 0)
936 goto out;
937 af_mask = ret;
938 num_matches = 0;
939 FOR_EACH_AUDIO_FORMAT(j) {
940 if ((af_mask & (1 << j)) == 0) /* no match */
941 continue;
942 ret = add_filter(j, arg);
943 if (ret < 0)
944 goto out;
945 num_matches++;
946 }
947 if (num_matches == 0)
948 PARA_WARNING_LOG("ignoring filter spec: %s\n",
949 conf.filter_arg[i]);
950 }
951 ret = init_default_filters(); /* use default values for the rest */
952 out:
953 return ret;
954 }
955
956 static int parse_stream_args(void)
957 {
958 int ret;
959
960 ret = parse_receiver_args();
961 if (ret < 0)
962 return ret;
963 ret = parse_filter_args();
964 if (ret < 0)
965 return ret;
966 ret = parse_writer_args();
967 if (ret < 0)
968 return ret;
969 return 1;
970 }
971
972 /* does not unlink socket on errors */
973 static int audiod_get_socket(void)
974 {
975 struct sockaddr_un unix_addr;
976 int ret, fd;
977
978 if (conf.socket_given)
979 socket_name = para_strdup(conf.socket_arg);
980 else {
981 char *hn = para_hostname();
982 socket_name = make_message("/var/paraslash/audiod_socket.%s",
983 hn);
984 free(hn);
985 }
986 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
987 if (conf.force_given)
988 unlink(socket_name);
989 ret = create_local_socket(socket_name, &unix_addr,
990 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
991 if (ret < 0)
992 goto err;
993 fd = ret;
994 if (listen(fd , 5) < 0) {
995 ret = -ERRNO_TO_PARA_ERROR(errno);
996 goto err;
997 }
998 ret = mark_fd_nonblocking(fd);
999 if (ret < 0)
1000 goto err;
1001 return fd;
1002 err:
1003 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1004 exit(EXIT_FAILURE);
1005 }
1006
1007 static void signal_pre_select(struct sched *s, struct task *t)
1008 {
1009 struct signal_task *st = container_of(t, struct signal_task, task);
1010 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1011 }
1012
1013 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1014 {
1015 int signum;
1016
1017 signum = para_next_signal(&s->rfds);
1018 switch (signum) {
1019 case SIGINT:
1020 case SIGTERM:
1021 case SIGHUP:
1022 PARA_NOTICE_LOG("received signal %d\n", signum);
1023 clean_exit(EXIT_FAILURE, "caught deadly signal");
1024 }
1025 return 0;
1026 }
1027
1028 static void signal_setup_default(struct signal_task *st)
1029 {
1030 st->task.pre_select = signal_pre_select;
1031 st->task.post_select = signal_post_select;
1032 sprintf(st->task.status, "signal task");
1033 }
1034
1035 static void command_pre_select(struct sched *s, struct task *t)
1036 {
1037 struct command_task *ct = container_of(t, struct command_task, task);
1038 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1039 }
1040
1041 static int command_post_select(struct sched *s, struct task *t)
1042 {
1043 int ret;
1044 struct command_task *ct = container_of(t, struct command_task, task);
1045 static struct timeval last_status_dump;
1046 struct timeval tmp, delay;
1047 bool force = true;
1048
1049 ret = handle_connect(ct->fd, &s->rfds);
1050 if (ret < 0)
1051 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1052 else if (ret > 0)
1053 goto dump;
1054
1055 /* if last status dump was less than 500ms ago, do nothing */
1056 delay.tv_sec = 0;
1057 delay.tv_usec = 500 * 1000;
1058 tv_add(&last_status_dump, &delay, &tmp);
1059 if (tv_diff(now, &tmp, NULL) < 0)
1060 return 0;
1061
1062 /*
1063 * If last status dump was more than 5s ago, force update. Otherwise,
1064 * update only those items that have changed.
1065 */
1066 delay.tv_sec = 5;
1067 delay.tv_usec = 0;
1068 tv_add(&last_status_dump, &delay, &tmp);
1069 if (tv_diff(now, &tmp, NULL) < 0)
1070 force = false;
1071 dump:
1072 audiod_status_dump(force);
1073 last_status_dump = *now;
1074 return 1;
1075 }
1076
1077 static void init_command_task(struct command_task *ct)
1078 {
1079 ct->task.pre_select = command_pre_select;
1080 ct->task.post_select = command_post_select;
1081 ct->task.error = 0;
1082 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1083 sprintf(ct->task.status, "command task");
1084 }
1085
1086 static void close_stat_pipe(void)
1087 {
1088 if (!stat_task->ct)
1089 return;
1090 client_close(stat_task->ct);
1091 stat_task->ct = NULL;
1092 clear_and_dump_items();
1093 stat_task->length_seconds = 0;
1094 stat_task->offset_seconds = 0;
1095 stat_task->vss_status = 0;
1096 stat_task->current_audio_format_num = -1;
1097 audiod_status_dump(true);
1098 }
1099
1100 /* avoid busy loop if server is down */
1101 static void set_stat_task_restart_barrier(unsigned seconds)
1102 {
1103 struct timeval delay = {seconds, 0};
1104 tv_add(now, &delay, &stat_task->restart_barrier);
1105 }
1106
1107 static bool must_close_slot(int slot_num)
1108 {
1109 struct slot_info *s = &slot[slot_num];
1110 struct audio_format_info *a = afi + s->format;
1111 int i;
1112
1113 if (s->format < 0)
1114 return false;
1115 if (s->receiver_node && s->receiver_node->task->error >= 0)
1116 return false;
1117 for (i = 0; i < a->num_filters; i++)
1118 if (s->fns && s->fns[i].task->error >= 0)
1119 return false;
1120 if (a->num_writers > 0) {
1121 for (i = 0; i < a->num_writers; i++)
1122 if (s->wns && s->wns[i].task->error >= 0)
1123 return false;
1124 } else {
1125 if (s->wns && s->wns[0].task->error >= 0)
1126 return false;
1127 }
1128 return true;
1129 }
1130
1131 static void close_slot(int slot_num)
1132 {
1133 struct slot_info *s = slot + slot_num;
1134
1135 PARA_INFO_LOG("closing slot %d\n", slot_num);
1136 close_writers(s);
1137 close_filters(s);
1138 close_receiver(slot_num);
1139 clear_slot(slot_num);
1140 }
1141
1142 static void close_unused_slots(void)
1143 {
1144 int i;
1145
1146 FOR_EACH_SLOT(i)
1147 if (must_close_slot(i))
1148 close_slot(i);
1149 }
1150
1151 /**
1152 * Close the connection to para_server and exit.
1153 *
1154 * \param status The exit status which is passed to exit(3).
1155 * \param msg The log message
1156 *
1157 * Log \a msg with loglevel \p EMERG, close the connection to para_server and
1158 * all slots, and call \p exit(status). \a status should be either EXIT_SUCCESS
1159 * or EXIT_FAILURE.
1160 *
1161 * \sa exit(3).
1162 */
1163 void __noreturn clean_exit(int status, const char *msg)
1164 {
1165 if (socket_name)
1166 unlink(socket_name);
1167 close_stat_pipe();
1168 close_unused_slots();
1169 audiod_cmdline_parser_free(&conf);
1170 close_stat_clients();
1171 PARA_EMERG_LOG("%s\n", msg);
1172 exit(status);
1173 }
1174
1175 /*
1176 * Check if any receivers/filters/writers need to be started and do so if
1177 * necessary.
1178 */
1179 static void start_stop_decoders(void)
1180 {
1181 int ret;
1182 struct slot_info *sl;
1183
1184 close_unused_slots();
1185 if (audiod_status != AUDIOD_ON ||
1186 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1187 return notify_receivers(E_NOT_PLAYING);
1188 if (!must_start_decoder())
1189 return;
1190 ret = open_receiver(stat_task->current_audio_format_num);
1191 if (ret < 0) {
1192 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1193 return;
1194 }
1195 sl = slot + ret;
1196 open_filters(sl);
1197 open_writers(sl);
1198 activate_grab_clients(&sched);
1199 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1200 }
1201
1202 static void status_pre_select(struct sched *s, struct task *t)
1203 {
1204 struct status_task *st = container_of(t, struct status_task, task);
1205 int i, ret, cafn = stat_task->current_audio_format_num;
1206
1207 if (must_start_decoder())
1208 goto min_delay;
1209 FOR_EACH_SLOT(i)
1210 if (must_close_slot(i))
1211 goto min_delay;
1212 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1213 if (ret > 0)
1214 goto min_delay;
1215 if (st->ct && audiod_status == AUDIOD_OFF)
1216 goto min_delay;
1217 if (!st->ct && audiod_status != AUDIOD_OFF)
1218 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1219 if (cafn >= 0)
1220 sched_request_barrier(&afi[cafn].restart_barrier, s);
1221 /*
1222 * If para_server is playing we'd like to have a smooth time display
1223 * even if we are running in standby mode. So we request a timeout that
1224 * expires at the next full second.
1225 */
1226 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1227 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1228 return;
1229 min_delay:
1230 sched_min_delay(s);
1231 }
1232
1233 /* restart the client task if necessary */
1234 static int status_post_select(struct sched *s, struct task *t)
1235 {
1236 struct status_task *st = container_of(t, struct status_task, task);
1237
1238 if (audiod_status == AUDIOD_OFF) {
1239 if (!st->ct)
1240 goto out;
1241 if (st->ct->task.error >= 0) {
1242 task_notify(&st->ct->task, E_AUDIOD_OFF);
1243 goto out;
1244 }
1245 close_stat_pipe();
1246 st->clock_diff_count = conf.clock_diff_count_arg;
1247 goto out;
1248 }
1249 if (st->ct) {
1250 char *buf;
1251 size_t sz;
1252 int ret;
1253
1254 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1255 if (ret < 0) {
1256 close_stat_pipe();
1257 goto out;
1258 }
1259 if (st->ct->status != CL_EXECUTING)
1260 goto out;
1261 if (ret == 0) {
1262 struct timeval diff;
1263 tv_diff(now, &st->last_status_read, &diff);
1264 if (diff.tv_sec > 61)
1265 task_notify(&st->ct->task, E_STATUS_TIMEOUT);
1266 goto out;
1267 }
1268 btr_merge(st->btrn, st->min_iqs);
1269 sz = btr_next_buffer(st->btrn, &buf);
1270 ret = for_each_stat_item(buf, sz, update_item);
1271 if (ret < 0) {
1272 task_notify(&st->ct->task, -ret);
1273 goto out;
1274 }
1275 if (sz != ret) {
1276 btr_consume(st->btrn, sz - ret);
1277 st->last_status_read = *now;
1278 st->min_iqs = 0;
1279 } else /* current status item crosses buffers */
1280 st->min_iqs = sz + 1;
1281 goto out;
1282 }
1283 btr_drain(st->btrn);
1284 st->current_audio_format_num = -1;
1285 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1286 goto out;
1287 if (st->clock_diff_count) { /* get status only one time */
1288 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1289 int argc = 5;
1290 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1291 st->clock_diff_count--;
1292 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1293 set_stat_task_restart_barrier(2);
1294
1295 } else {
1296 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1297 int argc = 4;
1298 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1299 set_stat_task_restart_barrier(5);
1300 }
1301 free(stat_item_values[SI_BASENAME]);
1302 stat_item_values[SI_BASENAME] = para_strdup(
1303 "no connection to para_server");
1304 stat_client_write_item(SI_BASENAME);
1305 st->last_status_read = *now;
1306 out:
1307 start_stop_decoders();
1308 return 0;
1309 }
1310
1311 static void init_status_task(struct status_task *st)
1312 {
1313 memset(st, 0, sizeof(struct status_task));
1314 st->task.pre_select = status_pre_select;
1315 st->task.post_select = status_post_select;
1316 st->sa_time_diff_sign = 1;
1317 st->clock_diff_count = conf.clock_diff_count_arg;
1318 st->current_audio_format_num = -1;
1319 sprintf(st->task.status, "stat");
1320 st->btrn = btr_new_node(&(struct btr_node_description)
1321 EMBRACE(.name = "stat"));
1322 }
1323
1324 static void set_initial_status(void)
1325 {
1326 audiod_status = AUDIOD_ON;
1327 if (!conf.mode_given)
1328 return;
1329 if (!strcmp(conf.mode_arg, "sb")) {
1330 audiod_status = AUDIOD_STANDBY;
1331 return;
1332 }
1333 if (!strcmp(conf.mode_arg, "off")) {
1334 audiod_status = AUDIOD_OFF;
1335 return;
1336 }
1337 if (strcmp(conf.mode_arg, "on"))
1338 PARA_WARNING_LOG("invalid mode\n");
1339 }
1340
1341 __noreturn static void print_help_and_die(void)
1342 {
1343 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1344 bool d = conf.detailed_help_given;
1345 unsigned flags;
1346
1347 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1348 ggo_print_help(&h, flags);
1349
1350 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1351 print_receiver_helps(flags);
1352 print_filter_helps(flags);
1353 print_writer_helps(flags);
1354 exit(0);
1355 }
1356
1357 static void init_colors_or_die(void)
1358 {
1359 int i;
1360
1361 if (!want_colors())
1362 return;
1363 daemon_set_default_log_colors();
1364 daemon_set_flag(DF_COLOR_LOG);
1365 for (i = 0; i < conf.log_color_given; i++)
1366 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1367 }
1368
1369 /**
1370 * the main function of para_audiod
1371 *
1372 * \param argc usual argument count
1373 * \param argv usual argument vector
1374 *
1375 * \return EXIT_SUCCESS or EXIT_FAILURE
1376 *
1377 * \sa para_audiod(1)
1378 * */
1379 int main(int argc, char *argv[])
1380 {
1381 int ret, i;
1382 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1383 struct audiod_cmdline_parser_params params = {
1384 .override = 0,
1385 .initialize = 1,
1386 .check_required = 0,
1387 .check_ambiguity = 0,
1388 .print_errors = 1
1389 };
1390
1391 valid_fd_012();
1392 audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1393 daemon_set_loglevel(conf.loglevel_arg);
1394 version_handle_flag("audiod", conf.version_given);
1395 /* init receivers/filters/writers early to make help work */
1396 recv_init();
1397 filter_init();
1398 writer_init();
1399 if (conf.help_given || conf.detailed_help_given)
1400 print_help_and_die();
1401 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1402 parse_config_or_die();
1403 init_colors_or_die();
1404 init_random_seed_or_die();
1405 daemon_set_flag(DF_LOG_TIME);
1406 daemon_set_flag(DF_LOG_HOSTNAME);
1407 daemon_set_flag(DF_LOG_LL);
1408 if (conf.log_timing_given)
1409 daemon_set_flag(DF_LOG_TIMING);
1410 if (conf.logfile_given) {
1411 daemon_set_logfile(conf.logfile_arg);
1412 daemon_open_log_or_die();
1413 }
1414 ret = parse_stream_args();
1415 if (ret < 0) {
1416 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1417 exit(EXIT_FAILURE);
1418 }
1419 log_welcome("para_audiod");
1420 set_server_start_time(NULL);
1421 set_initial_status();
1422 FOR_EACH_SLOT(i)
1423 clear_slot(i);
1424 setup_signal_handling();
1425 signal_setup_default(sig_task);
1426
1427 init_status_task(stat_task);
1428 init_command_task(cmd_task);
1429
1430 if (conf.daemon_given)
1431 daemonize(false /* parent exits immediately */);
1432
1433 register_task(&sched, &sig_task->task);
1434 register_task(&sched, &cmd_task->task);
1435 register_task(&sched, &stat_task->task);
1436 sched.default_timeout.tv_sec = 2;
1437 sched.default_timeout.tv_usec = 999 * 1000;
1438 ret = schedule(&sched);
1439 sched_shutdown(&sched);
1440
1441 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1442 return EXIT_FAILURE;
1443 }