task_register() conversion: filter tasks
[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 }
412
413 static void close_writers(struct slot_info *s)
414 {
415 struct audio_format_info *a;
416 int i;
417
418 if (s->format < 0)
419 return;
420 assert(s->wns);
421 a = afi + s->format;
422 if (a->num_writers == 0)
423 writer_cleanup(s->wns);
424 else {
425 for (i = 0; i < a->num_writers; i++)
426 writer_cleanup(s->wns + i);
427 }
428 free(s->wns);
429 s->wns = NULL;
430 }
431
432 static void close_filters(struct slot_info *s)
433 {
434 int i;
435 struct audio_format_info *a = afi + s->format;
436 if (a->num_filters == 0)
437 return;
438 for (i = a->num_filters - 1; i >= 0; i--) {
439 struct filter_node *fn = s->fns + i;
440 struct filter *f;
441
442 if (!fn)
443 continue;
444 f = filters + fn->filter_num;
445 if (f->close)
446 f->close(fn);
447 btr_remove_node(&fn->btrn);
448 task_reap(&fn->task);
449 }
450 free(s->fns);
451 s->fns = NULL;
452 }
453
454 static void notify_receivers(int error)
455 {
456 int i;
457
458 FOR_EACH_SLOT(i) {
459 struct slot_info *s = slot + i;
460 if (s->format < 0)
461 continue;
462 if (!s->receiver_node)
463 continue;
464 task_notify(s->receiver_node->task, error);
465 }
466 }
467
468 static int get_empty_slot(void)
469 {
470 int i;
471 struct slot_info *s;
472
473 FOR_EACH_SLOT(i) {
474 s = &slot[i];
475 if (s->format < 0) {
476 clear_slot(i);
477 return i;
478 }
479 if (s->wns || s->receiver_node || s->fns)
480 continue;
481 clear_slot(i);
482 return i;
483 }
484 return -E_NO_MORE_SLOTS;
485 }
486
487 static void open_filters(struct slot_info *s)
488 {
489 struct audio_format_info *a = afi + s->format;
490 struct filter_node *fn;
491 int nf = a->num_filters;
492 struct btr_node *parent;
493 int i;
494
495 if (nf == 0)
496 return;
497 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
498 assert(s->fns == NULL);
499 s->fns = para_calloc(nf * sizeof(struct filter_node));
500 parent = s->receiver_node->btrn;
501 for (i = 0; i < nf; i++) {
502 char buf[20];
503 struct filter *f = filters + a->filter_nums[i];
504 fn = s->fns + i;
505 fn->filter_num = a->filter_nums[i];
506 fn->conf = a->filter_conf[i];
507 fn->btrn = btr_new_node(&(struct btr_node_description)
508 EMBRACE(.name = f->name, .parent = parent,
509 .handler = f->execute, .context = fn));
510
511 f->open(fn);
512 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
513 fn->task = task_register(&(struct task_info) {
514 .name = buf,
515 .pre_select = f->pre_select,
516 .post_select = f->post_select,
517 .context = fn,
518 }, &sched);
519 parent = fn->btrn;
520 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
521 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
522 }
523 }
524
525 static void open_writers(struct slot_info *s)
526 {
527 int i;
528 struct audio_format_info *a = afi + s->format;
529 struct writer_node *wn;
530 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
531
532 assert(s->wns == NULL);
533 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
534 * sizeof(struct writer_node));
535 for (i = 0; i < a->num_writers; i++) {
536 wn = s->wns + i;
537 wn->conf = a->writer_conf[i];
538 wn->writer_num = a->writer_nums[i];
539 register_writer_node(wn, parent, &sched);
540 PARA_NOTICE_LOG("%s writer started in slot %d\n",
541 writer_names[a->writer_nums[i]], (int)(s - slot));
542 }
543 }
544
545 /* returns slot num on success */
546 static int open_receiver(int format)
547 {
548 struct audio_format_info *a = &afi[format];
549 struct slot_info *s;
550 int ret, slot_num;
551 struct receiver *r = a->receiver;
552 struct receiver_node *rn;
553
554 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
555 ret = get_empty_slot();
556 if (ret < 0)
557 return ret;
558 slot_num = ret;
559 rn = para_calloc(sizeof(*rn));
560 rn->receiver = r;
561 rn->conf = a->receiver_conf;
562 rn->btrn = btr_new_node(&(struct btr_node_description)
563 EMBRACE(.name = r->name, .context = rn));
564 ret = r->open(rn);
565 if (ret < 0) {
566 btr_remove_node(&rn->btrn);
567 free(rn);
568 return ret;
569 }
570 s = &slot[slot_num];
571 s->format = format;
572 s->receiver_node = rn;
573 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
574 audio_formats[format], r->name, slot_num);
575 rn->task = task_register(&(struct task_info) {
576 .name = r->name,
577 .pre_select = r->pre_select,
578 .post_select = r->post_select,
579 .context = rn,
580 }, &sched);
581 return slot_num;
582 }
583
584 static bool receiver_running(void)
585 {
586 int i;
587 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
588
589 FOR_EACH_SLOT(i) {
590 struct slot_info *s = &slot[i];
591 long unsigned ss2 = s->server_stream_start.tv_sec;
592
593 if (!s->receiver_node)
594 continue;
595 if (s->receiver_node->task->error >= 0)
596 return true;
597 if (ss1 == ss2)
598 return true;
599 }
600 return false;
601 }
602
603 /**
604 * Return the root node of the current buffer tree.
605 *
606 * This is only used for stream grabbing.
607 *
608 * \return \p NULL if no slot is currently active. If more than one buffer tree
609 * exists, the node corresponding to the most recently started receiver is
610 * returned.
611 */
612 struct btr_node *audiod_get_btr_root(void)
613 {
614 int i, newest_slot = -1;
615 struct timeval newest_rstime = {0, 0};
616
617 FOR_EACH_SLOT(i) {
618 struct slot_info *s = &slot[i];
619 struct timeval rstime;
620 if (!s->receiver_node)
621 continue;
622 if (s->receiver_node->task->error < 0)
623 continue;
624 btr_get_node_start(s->receiver_node->btrn, &rstime);
625 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
626 continue;
627 newest_rstime = rstime;
628 newest_slot = i;
629 }
630 if (newest_slot == -1)
631 return NULL;
632 return slot[newest_slot].receiver_node->btrn;
633 }
634
635 /* whether a new instance of a decoder should be started. */
636 static bool must_start_decoder(void)
637 {
638 int cafn = stat_task->current_audio_format_num;
639 unsigned vs = stat_task->vss_status;
640
641 if (audiod_status != AUDIOD_ON)
642 return false;
643 if (cafn < 0)
644 return false;
645 if (!stat_task->ct)
646 return false;
647 if (vs & VSS_STATUS_FLAG_NEXT)
648 return false;
649 if (!(vs & VSS_STATUS_FLAG_PLAYING))
650 return false;
651 if (receiver_running())
652 return false;
653 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
654 return false;
655 return true;
656 }
657
658 static void compute_time_diff(const struct timeval *status_time)
659 {
660 struct timeval tmp, diff;
661 static unsigned count;
662 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
663 const struct timeval max_deviation = {0, 500 * 1000};
664 const int time_smooth = 5;
665
666 sign = tv_diff(status_time, now, &diff);
667 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
668 // sign, sa_time_diff_sign);
669 if (!count) {
670 sa_time_diff_sign = sign;
671 stat_task->sa_time_diff = diff;
672 count++;
673 goto out;
674 }
675 if (count > 5) {
676 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
677 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
678 PARA_WARNING_LOG("time diff jump: %lims\n",
679 s * tv2ms(&tmp));
680 }
681 count++;
682 sa_time_diff_sign = tv_convex_combination(
683 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
684 count > 10? sign : sign * time_smooth, &diff,
685 &tmp);
686 stat_task->sa_time_diff = tmp;
687 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
688 sign < 0? "-" : "+",
689 tv2ms(&diff),
690 sa_time_diff_sign < 0? "-" : "+",
691 tv2ms(&stat_task->sa_time_diff)
692 );
693 out:
694 stat_task->sa_time_diff_sign = sa_time_diff_sign;
695 }
696
697 static int update_item(int itemnum, char *buf)
698 {
699 long unsigned sec, usec;
700
701 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
702 return 1;
703 free(stat_item_values[itemnum]);
704 stat_item_values[itemnum] = para_strdup(buf);
705 stat_client_write_item(itemnum);
706 switch (itemnum) {
707 case SI_STATUS_FLAGS:
708 stat_task->vss_status = 0;
709 if (strchr(buf, 'N'))
710 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
711 if (strchr(buf, 'P'))
712 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
713 break;
714 case SI_OFFSET:
715 stat_task->offset_seconds = atoi(buf);
716 break;
717 case SI_SECONDS_TOTAL:
718 stat_task->length_seconds = atoi(buf);
719 break;
720 case SI_STREAM_START:
721 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
722 stat_task->server_stream_start.tv_sec = sec;
723 stat_task->server_stream_start.tv_usec = usec;
724 }
725 break;
726 case SI_CURRENT_TIME:
727 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
728 struct timeval tv = {sec, usec};
729 compute_time_diff(&tv);
730 }
731 break;
732 case SI_FORMAT:
733 stat_task->current_audio_format_num
734 = get_audio_format_num(buf);
735 }
736 return 1;
737 }
738
739 static int parse_stream_command(const char *txt, char **cmd)
740 {
741 int ret, len;
742 char *re, *p = strchr(txt, ':');
743
744 if (!p)
745 return -E_MISSING_COLON;
746 *cmd = p + 1;
747 len = p - txt;
748 re = malloc(len + 1);
749 strncpy(re, txt, len);
750 re[len] = '\0';
751 ret = get_matching_audio_format_nums(re);
752 free(re);
753 return ret;
754 }
755
756 static int add_filter(int format, char *cmdline)
757 {
758 struct audio_format_info *a = &afi[format];
759 int filter_num, nf = a->num_filters;
760 void *cfg;
761
762 filter_num = check_filter_arg(cmdline, &cfg);
763 if (filter_num < 0)
764 return filter_num;
765 a->filter_conf = para_realloc(a->filter_conf,
766 (nf + 1) * sizeof(void *));
767 a->filter_nums = para_realloc(a->filter_nums,
768 (nf + 1) * sizeof(unsigned));
769 a->filter_nums[nf] = filter_num;
770 a->filter_conf[nf] = cfg;
771 a->num_filters++;
772 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
773 filters[filter_num].name);
774 return filter_num;
775 }
776
777 static int parse_writer_args(void)
778 {
779 int i, ret;
780 char *cmd;
781 struct audio_format_info *a;
782
783 for (i = 0; i < conf.writer_given; i++) {
784 void *wconf;
785 int j, nw, writer_num, af_mask;
786
787 ret = parse_stream_command(conf.writer_arg[i], &cmd);
788 if (ret < 0)
789 return ret;
790 af_mask = ret;
791 FOR_EACH_AUDIO_FORMAT(j) {
792 a = afi + j;
793 if ((af_mask & (1 << j)) == 0) /* no match */
794 continue;
795 wconf = check_writer_arg_or_die(cmd, &writer_num);
796 nw = a->num_writers;
797 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
798 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
799 a->writer_nums[nw] = writer_num;
800 a->writer_conf[nw] = wconf;
801 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
802 nw, writer_names[writer_num]);
803 a->num_writers++;
804 }
805 }
806 /* Use default writer for audio formats which are not yet set up. */
807 FOR_EACH_AUDIO_FORMAT(i) {
808 void *writer_conf;
809 int writer_num;
810 a = afi + i;
811 if (a->num_writers > 0)
812 continue; /* already set up */
813 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
814 a->writer_nums = para_malloc(sizeof(int));
815 a->writer_nums[0] = writer_num;
816 a->writer_conf = para_malloc(sizeof(void *));
817 a->writer_conf[0] = writer_conf;
818 a->num_writers = 1;
819 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
820 writer_names[writer_num]);
821 }
822 return 1;
823 }
824
825 static int parse_receiver_args(void)
826 {
827 int i, ret, receiver_num;
828 char *cmd = NULL;
829 struct audio_format_info *a;
830
831 for (i = conf.receiver_given - 1; i >= 0; i--) {
832 char *arg;
833 int j, af_mask;
834
835 ret = parse_stream_command(conf.receiver_arg[i], &arg);
836 if (ret < 0)
837 goto out;
838 af_mask = ret;
839 FOR_EACH_AUDIO_FORMAT(j) {
840 a = afi + j;
841 if ((af_mask & (1 << j)) == 0) /* no match */
842 continue;
843 /*
844 * If multiple receivers are given for this audio format, the
845 * last one wins and we have to free the previous receiver
846 * config here. Since we are iterating backwards, the winning
847 * receiver arg is in fact the first one given.
848 */
849 if (a->receiver_conf)
850 a->receiver->free_config(a->receiver_conf);
851 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
852 ret = -E_RECV_SYNTAX;
853 if (!a->receiver_conf)
854 goto out;
855 a->receiver = receivers + receiver_num;
856 }
857 }
858 /*
859 * Use the first available receiver with no arguments for those audio
860 * formats for which no receiver was specified.
861 */
862 cmd = para_strdup(receivers[0].name);
863 FOR_EACH_AUDIO_FORMAT(i) {
864 a = &afi[i];
865 if (a->receiver_conf)
866 continue;
867 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
868 if (!a->receiver_conf)
869 return -E_RECV_SYNTAX;
870 a->receiver = &receivers[receiver_num];
871 }
872 FOR_EACH_AUDIO_FORMAT(i) {
873 a = afi + i;
874 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
875 audio_formats[i], a->receiver->name);
876 }
877 ret = 1;
878 out:
879 free(cmd);
880 return ret;
881 }
882
883 static int init_default_filters(void)
884 {
885 int i, ret = 1;
886
887 FOR_EACH_AUDIO_FORMAT(i) {
888 struct audio_format_info *a = &afi[i];
889 char *tmp;
890 int j;
891
892 if (a->num_filters)
893 continue; /* no default -- nothing to to */
894 /*
895 * udp and dccp streams are fec-encoded, so add fecdec as the
896 * first filter.
897 */
898 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
899 strcmp(afi[i].receiver->name, "dccp") == 0) {
900 tmp = para_strdup("fecdec");
901 add_filter(i, tmp);
902 free(tmp);
903 if (ret < 0)
904 goto out;
905 }
906 /* add "dec" to audio format name */
907 tmp = make_message("%sdec", audio_formats[i]);
908 for (j = 0; filters[j].name; j++)
909 if (!strcmp(tmp, filters[j].name))
910 break;
911 free(tmp);
912 ret = -E_UNSUPPORTED_FILTER;
913 if (!filters[j].name)
914 goto out;
915 tmp = para_strdup(filters[j].name);
916 ret = add_filter(i, tmp);
917 free(tmp);
918 if (ret < 0)
919 goto out;
920 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
921 filters[j].name);
922 }
923 out:
924 return ret;
925 }
926
927 static int parse_filter_args(void)
928 {
929 int i, j, ret, af_mask, num_matches;
930
931 for (i = 0; i < conf.filter_given; i++) {
932 char *arg;
933 ret = parse_stream_command(conf.filter_arg[i], &arg);
934 if (ret < 0)
935 goto out;
936 af_mask = ret;
937 num_matches = 0;
938 FOR_EACH_AUDIO_FORMAT(j) {
939 if ((af_mask & (1 << j)) == 0) /* no match */
940 continue;
941 ret = add_filter(j, arg);
942 if (ret < 0)
943 goto out;
944 num_matches++;
945 }
946 if (num_matches == 0)
947 PARA_WARNING_LOG("ignoring filter spec: %s\n",
948 conf.filter_arg[i]);
949 }
950 ret = init_default_filters(); /* use default values for the rest */
951 out:
952 return ret;
953 }
954
955 static int parse_stream_args(void)
956 {
957 int ret;
958
959 ret = parse_receiver_args();
960 if (ret < 0)
961 return ret;
962 ret = parse_filter_args();
963 if (ret < 0)
964 return ret;
965 ret = parse_writer_args();
966 if (ret < 0)
967 return ret;
968 return 1;
969 }
970
971 /* does not unlink socket on errors */
972 static int audiod_get_socket(void)
973 {
974 struct sockaddr_un unix_addr;
975 int ret, fd;
976
977 if (conf.socket_given)
978 socket_name = para_strdup(conf.socket_arg);
979 else {
980 char *hn = para_hostname();
981 socket_name = make_message("/var/paraslash/audiod_socket.%s",
982 hn);
983 free(hn);
984 }
985 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
986 if (conf.force_given)
987 unlink(socket_name);
988 ret = create_local_socket(socket_name, &unix_addr,
989 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
990 if (ret < 0)
991 goto err;
992 fd = ret;
993 if (listen(fd , 5) < 0) {
994 ret = -ERRNO_TO_PARA_ERROR(errno);
995 goto err;
996 }
997 ret = mark_fd_nonblocking(fd);
998 if (ret < 0)
999 goto err;
1000 return fd;
1001 err:
1002 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1003 exit(EXIT_FAILURE);
1004 }
1005
1006 static void signal_pre_select(struct sched *s, struct task *t)
1007 {
1008 struct signal_task *st = container_of(t, struct signal_task, task);
1009 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1010 }
1011
1012 static int signal_post_select(struct sched *s, __a_unused struct task *t)
1013 {
1014 int signum;
1015
1016 signum = para_next_signal(&s->rfds);
1017 switch (signum) {
1018 case SIGINT:
1019 case SIGTERM:
1020 case SIGHUP:
1021 PARA_NOTICE_LOG("received signal %d\n", signum);
1022 clean_exit(EXIT_FAILURE, "caught deadly signal");
1023 }
1024 return 0;
1025 }
1026
1027 static void signal_setup_default(struct signal_task *st)
1028 {
1029 st->task.pre_select = signal_pre_select;
1030 st->task.post_select = signal_post_select;
1031 sprintf(st->task.status, "signal task");
1032 }
1033
1034 static void command_pre_select(struct sched *s, struct task *t)
1035 {
1036 struct command_task *ct = container_of(t, struct command_task, task);
1037 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1038 }
1039
1040 static int command_post_select(struct sched *s, struct task *t)
1041 {
1042 int ret;
1043 struct command_task *ct = container_of(t, struct command_task, task);
1044 static struct timeval last_status_dump;
1045 struct timeval tmp, delay;
1046 bool force = true;
1047
1048 ret = handle_connect(ct->fd, &s->rfds);
1049 if (ret < 0)
1050 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1051 else if (ret > 0)
1052 goto dump;
1053
1054 /* if last status dump was less than 500ms ago, do nothing */
1055 delay.tv_sec = 0;
1056 delay.tv_usec = 500 * 1000;
1057 tv_add(&last_status_dump, &delay, &tmp);
1058 if (tv_diff(now, &tmp, NULL) < 0)
1059 return 0;
1060
1061 /*
1062 * If last status dump was more than 5s ago, force update. Otherwise,
1063 * update only those items that have changed.
1064 */
1065 delay.tv_sec = 5;
1066 delay.tv_usec = 0;
1067 tv_add(&last_status_dump, &delay, &tmp);
1068 if (tv_diff(now, &tmp, NULL) < 0)
1069 force = false;
1070 dump:
1071 audiod_status_dump(force);
1072 last_status_dump = *now;
1073 return 1;
1074 }
1075
1076 static void init_command_task(struct command_task *ct)
1077 {
1078 ct->task.pre_select = command_pre_select;
1079 ct->task.post_select = command_post_select;
1080 ct->task.error = 0;
1081 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1082 sprintf(ct->task.status, "command task");
1083 }
1084
1085 static void close_stat_pipe(void)
1086 {
1087 if (!stat_task->ct)
1088 return;
1089 client_close(stat_task->ct);
1090 stat_task->ct = NULL;
1091 clear_and_dump_items();
1092 stat_task->length_seconds = 0;
1093 stat_task->offset_seconds = 0;
1094 stat_task->vss_status = 0;
1095 stat_task->current_audio_format_num = -1;
1096 audiod_status_dump(true);
1097 }
1098
1099 /* avoid busy loop if server is down */
1100 static void set_stat_task_restart_barrier(unsigned seconds)
1101 {
1102 struct timeval delay = {seconds, 0};
1103 tv_add(now, &delay, &stat_task->restart_barrier);
1104 }
1105
1106 static bool must_close_slot(int slot_num)
1107 {
1108 struct slot_info *s = &slot[slot_num];
1109 struct audio_format_info *a = afi + s->format;
1110 int i;
1111
1112 if (s->format < 0)
1113 return false;
1114 if (s->receiver_node && s->receiver_node->task->error >= 0)
1115 return false;
1116 for (i = 0; i < a->num_filters; i++)
1117 if (s->fns && s->fns[i].task->error >= 0)
1118 return false;
1119 if (a->num_writers > 0) {
1120 for (i = 0; i < a->num_writers; i++)
1121 if (s->wns && s->wns[i].task.error >= 0)
1122 return false;
1123 } else {
1124 if (s->wns && s->wns[0].task.error >= 0)
1125 return false;
1126 }
1127 return true;
1128 }
1129
1130 static void close_slot(int slot_num)
1131 {
1132 struct slot_info *s = slot + slot_num;
1133
1134 PARA_INFO_LOG("closing slot %d\n", slot_num);
1135 close_writers(s);
1136 close_filters(s);
1137 close_receiver(slot_num);
1138 clear_slot(slot_num);
1139 }
1140
1141 static void close_unused_slots(void)
1142 {
1143 int i;
1144
1145 FOR_EACH_SLOT(i)
1146 if (must_close_slot(i))
1147 close_slot(i);
1148 }
1149
1150 /**
1151 * Close the connection to para_server and exit.
1152 *
1153 * \param status The exit status which is passed to exit(3).
1154 * \param msg The log message
1155 *
1156 * Log \a msg with loglevel \p EMERG, close the connection to para_server and
1157 * all slots, and call \p exit(status). \a status should be either EXIT_SUCCESS
1158 * or EXIT_FAILURE.
1159 *
1160 * \sa exit(3).
1161 */
1162 void __noreturn clean_exit(int status, const char *msg)
1163 {
1164 if (socket_name)
1165 unlink(socket_name);
1166 close_stat_pipe();
1167 close_unused_slots();
1168 audiod_cmdline_parser_free(&conf);
1169 close_stat_clients();
1170 PARA_EMERG_LOG("%s\n", msg);
1171 exit(status);
1172 }
1173
1174 /*
1175 * Check if any receivers/filters/writers need to be started and do so if
1176 * necessary.
1177 */
1178 static void start_stop_decoders(void)
1179 {
1180 int ret;
1181 struct slot_info *sl;
1182
1183 close_unused_slots();
1184 if (audiod_status != AUDIOD_ON ||
1185 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1186 return notify_receivers(E_NOT_PLAYING);
1187 if (!must_start_decoder())
1188 return;
1189 ret = open_receiver(stat_task->current_audio_format_num);
1190 if (ret < 0) {
1191 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1192 return;
1193 }
1194 sl = slot + ret;
1195 open_filters(sl);
1196 open_writers(sl);
1197 activate_grab_clients(&sched);
1198 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1199 }
1200
1201 static void status_pre_select(struct sched *s, struct task *t)
1202 {
1203 struct status_task *st = container_of(t, struct status_task, task);
1204 int i, ret, cafn = stat_task->current_audio_format_num;
1205
1206 if (must_start_decoder())
1207 goto min_delay;
1208 FOR_EACH_SLOT(i)
1209 if (must_close_slot(i))
1210 goto min_delay;
1211 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1212 if (ret > 0)
1213 goto min_delay;
1214 if (st->ct && audiod_status == AUDIOD_OFF)
1215 goto min_delay;
1216 if (!st->ct && audiod_status != AUDIOD_OFF)
1217 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1218 if (cafn >= 0)
1219 sched_request_barrier(&afi[cafn].restart_barrier, s);
1220 /*
1221 * If para_server is playing we'd like to have a smooth time display
1222 * even if we are running in standby mode. So we request a timeout that
1223 * expires at the next full second.
1224 */
1225 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1226 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1227 return;
1228 min_delay:
1229 sched_min_delay(s);
1230 }
1231
1232 /* restart the client task if necessary */
1233 static int status_post_select(struct sched *s, struct task *t)
1234 {
1235 struct status_task *st = container_of(t, struct status_task, task);
1236
1237 if (audiod_status == AUDIOD_OFF) {
1238 if (!st->ct)
1239 goto out;
1240 if (st->ct->task.error >= 0) {
1241 task_notify(&st->ct->task, E_AUDIOD_OFF);
1242 goto out;
1243 }
1244 close_stat_pipe();
1245 st->clock_diff_count = conf.clock_diff_count_arg;
1246 goto out;
1247 }
1248 if (st->ct) {
1249 char *buf;
1250 size_t sz;
1251 int ret;
1252
1253 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1254 if (ret < 0) {
1255 close_stat_pipe();
1256 goto out;
1257 }
1258 if (st->ct->status != CL_EXECUTING)
1259 goto out;
1260 if (ret == 0) {
1261 struct timeval diff;
1262 tv_diff(now, &st->last_status_read, &diff);
1263 if (diff.tv_sec > 61)
1264 task_notify(&st->ct->task, E_STATUS_TIMEOUT);
1265 goto out;
1266 }
1267 btr_merge(st->btrn, st->min_iqs);
1268 sz = btr_next_buffer(st->btrn, &buf);
1269 ret = for_each_stat_item(buf, sz, update_item);
1270 if (ret < 0) {
1271 task_notify(&st->ct->task, -ret);
1272 goto out;
1273 }
1274 if (sz != ret) {
1275 btr_consume(st->btrn, sz - ret);
1276 st->last_status_read = *now;
1277 st->min_iqs = 0;
1278 } else /* current status item crosses buffers */
1279 st->min_iqs = sz + 1;
1280 goto out;
1281 }
1282 btr_drain(st->btrn);
1283 st->current_audio_format_num = -1;
1284 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1285 goto out;
1286 if (st->clock_diff_count) { /* get status only one time */
1287 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1288 int argc = 5;
1289 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1290 st->clock_diff_count--;
1291 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1292 set_stat_task_restart_barrier(2);
1293
1294 } else {
1295 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1296 int argc = 4;
1297 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1298 set_stat_task_restart_barrier(5);
1299 }
1300 free(stat_item_values[SI_BASENAME]);
1301 stat_item_values[SI_BASENAME] = para_strdup(
1302 "no connection to para_server");
1303 stat_client_write_item(SI_BASENAME);
1304 st->last_status_read = *now;
1305 out:
1306 start_stop_decoders();
1307 return 0;
1308 }
1309
1310 static void init_status_task(struct status_task *st)
1311 {
1312 memset(st, 0, sizeof(struct status_task));
1313 st->task.pre_select = status_pre_select;
1314 st->task.post_select = status_post_select;
1315 st->sa_time_diff_sign = 1;
1316 st->clock_diff_count = conf.clock_diff_count_arg;
1317 st->current_audio_format_num = -1;
1318 sprintf(st->task.status, "stat");
1319 st->btrn = btr_new_node(&(struct btr_node_description)
1320 EMBRACE(.name = "stat"));
1321 }
1322
1323 static void set_initial_status(void)
1324 {
1325 audiod_status = AUDIOD_ON;
1326 if (!conf.mode_given)
1327 return;
1328 if (!strcmp(conf.mode_arg, "sb")) {
1329 audiod_status = AUDIOD_STANDBY;
1330 return;
1331 }
1332 if (!strcmp(conf.mode_arg, "off")) {
1333 audiod_status = AUDIOD_OFF;
1334 return;
1335 }
1336 if (strcmp(conf.mode_arg, "on"))
1337 PARA_WARNING_LOG("invalid mode\n");
1338 }
1339
1340 __noreturn static void print_help_and_die(void)
1341 {
1342 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1343 bool d = conf.detailed_help_given;
1344 unsigned flags;
1345
1346 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1347 ggo_print_help(&h, flags);
1348
1349 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1350 print_receiver_helps(flags);
1351 print_filter_helps(flags);
1352 print_writer_helps(flags);
1353 exit(0);
1354 }
1355
1356 static void init_colors_or_die(void)
1357 {
1358 int i;
1359
1360 if (!want_colors())
1361 return;
1362 daemon_set_default_log_colors();
1363 daemon_set_flag(DF_COLOR_LOG);
1364 for (i = 0; i < conf.log_color_given; i++)
1365 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1366 }
1367
1368 /**
1369 * the main function of para_audiod
1370 *
1371 * \param argc usual argument count
1372 * \param argv usual argument vector
1373 *
1374 * \return EXIT_SUCCESS or EXIT_FAILURE
1375 *
1376 * \sa para_audiod(1)
1377 * */
1378 int main(int argc, char *argv[])
1379 {
1380 int ret, i;
1381 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1382 struct audiod_cmdline_parser_params params = {
1383 .override = 0,
1384 .initialize = 1,
1385 .check_required = 0,
1386 .check_ambiguity = 0,
1387 .print_errors = 1
1388 };
1389
1390 valid_fd_012();
1391 audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1392 daemon_set_loglevel(conf.loglevel_arg);
1393 version_handle_flag("audiod", conf.version_given);
1394 /* init receivers/filters/writers early to make help work */
1395 recv_init();
1396 filter_init();
1397 writer_init();
1398 if (conf.help_given || conf.detailed_help_given)
1399 print_help_and_die();
1400 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1401 parse_config_or_die();
1402 init_colors_or_die();
1403 init_random_seed_or_die();
1404 daemon_set_flag(DF_LOG_TIME);
1405 daemon_set_flag(DF_LOG_HOSTNAME);
1406 daemon_set_flag(DF_LOG_LL);
1407 if (conf.log_timing_given)
1408 daemon_set_flag(DF_LOG_TIMING);
1409 if (conf.logfile_given) {
1410 daemon_set_logfile(conf.logfile_arg);
1411 daemon_open_log_or_die();
1412 }
1413 ret = parse_stream_args();
1414 if (ret < 0) {
1415 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1416 exit(EXIT_FAILURE);
1417 }
1418 log_welcome("para_audiod");
1419 set_server_start_time(NULL);
1420 set_initial_status();
1421 FOR_EACH_SLOT(i)
1422 clear_slot(i);
1423 setup_signal_handling();
1424 signal_setup_default(sig_task);
1425
1426 init_status_task(stat_task);
1427 init_command_task(cmd_task);
1428
1429 if (conf.daemon_given)
1430 daemonize(false /* parent exits immediately */);
1431
1432 register_task(&sched, &sig_task->task);
1433 register_task(&sched, &cmd_task->task);
1434 register_task(&sched, &stat_task->task);
1435 sched.default_timeout.tv_sec = 2;
1436 sched.default_timeout.tv_usec = 999 * 1000;
1437 ret = schedule(&sched);
1438 sched_shutdown(&sched);
1439
1440 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1441 return EXIT_FAILURE;
1442 }