audiod: Add a paranoia check to close_writers().
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2009 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 <dirent.h>
11 #include <signal.h>
12 #include <openssl/rc4.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "error.h"
17 #include "crypt.h"
18 #include "audiod.cmdline.h"
19 #include "list.h"
20 #include "sched.h"
21 #include "ggo.h"
22 #include "recv.h"
23 #include "buffer_tree.h"
24 #include "filter.h"
25 #include "grab_client.h"
26 #include "client.cmdline.h"
27 #include "client.h"
28 #include "audiod.h"
29 #include "net.h"
30 #include "daemon.h"
31 #include "string.h"
32 #include "fd.h"
33 #include "write.h"
34 #include "write_common.h"
35 #include "signal.h"
36
37 /** define the array of error lists needed by para_audiod */
38 INIT_AUDIOD_ERRLISTS;
39 /** define the array containing all supported audio formats */
40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
41
42 /** Defines how audiod handles one supported audio format. */
43 struct audio_format_info {
44 /** pointer to the receiver for this audio format */
45 struct receiver *receiver;
46 /** the receiver configuration */
47 void *receiver_conf;
48 /** the number of filters that should be activated for this audio format */
49 unsigned int num_filters;
50 /** Array of filter numbers to be activated. */
51 unsigned *filter_nums;
52 /** Pointer to the array of filter configurations. */
53 void **filter_conf;
54 /** the number of filters that should be activated for this audio format */
55 unsigned int num_writers;
56 /** Array of writer numbers to be activated. */
57 int *writer_nums;
58 /** pointer to the array of writer configurations */
59 void **writer_conf;
60 /** do not start receiver/filters/writer before this time */
61 struct timeval restart_barrier;
62 };
63
64 /**
65 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
66 * be associated with a receiver/filter/writer triple. This array holds all
67 * information on the status of these slots.
68 *
69 * \sa struct slot_info
70 * */
71 struct slot_info slot[MAX_STREAM_SLOTS];
72
73 /** The vss status flags audiod is interested in. */
74 enum vss_status_flags {
75 /** Whether the 'N' flag is set. */
76 VSS_STATUS_FLAG_NEXT = 1,
77 /** The 'P' flag is set. */
78 VSS_STATUS_FLAG_PLAYING = 2,
79 };
80
81 /**
82 * The task for obtaining para_server's status (para_client stat).
83 *
84 * \sa struct task, struct sched.
85 */
86 struct status_task {
87 /** The associated task structure of audiod. */
88 struct task task;
89 /** Client data associated with the stat task. */
90 struct client_task *ct;
91 /** Do not restart client command until this time. */
92 struct timeval restart_barrier;
93 /** Last time we received status data from para_server. */
94 struct timeval last_status_read;
95 /** The offset value announced by para_server. */
96 int offset_seconds;
97 /** The length of the current audio file as announced by para_server. */
98 int length_seconds;
99 /** The start of the current stream from the view of para_server. */
100 struct timeval server_stream_start;
101 /** The average time deviation between para_server and para_audiod. */
102 struct timeval sa_time_diff;
103 /** Whether client time is ahead of server time. */
104 int sa_time_diff_sign;
105 /** The 'P' and the 'N' flags as announced by para_server. */
106 enum vss_status_flags vss_status;
107 /** Number of times the clock difference is to be checked. */
108 unsigned clock_diff_count;
109 /** When to start the next check for clock difference. */
110 struct timeval clock_diff_barrier;
111 /** Number of the audio format as announced by para_server. */
112 int current_audio_format_num;
113 };
114
115 /** The array of status items sent by para_server. */
116 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
117
118 /**
119 * the current mode of operation of which can be changed by the on/off/cycle
120 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
121 */
122 int audiod_status = AUDIOD_ON;
123
124 /**
125 * the gengetopt args_info struct that holds information on all command line
126 * arguments
127 */
128 struct audiod_args_info conf;
129
130 static char *socket_name;
131 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
132
133 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
134
135 static struct status_task status_task_struct;
136
137 /**
138 * the task that calls the status command of para_server
139 *
140 * \sa struct status_task
141 */
142 static struct status_task *stat_task = &status_task_struct;
143 static struct timeval initial_delay_barrier;
144
145 /**
146 * the task for handling audiod commands
147 *
148 * \sa struct task, struct sched
149 */
150 struct command_task {
151 /** the local listening socket */
152 int fd;
153 /** the associated task structure */
154 struct task task;
155 };
156
157 /** iterate over all supported audio formats */
158 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
159
160 /**
161 * get the audio format number
162 * \param name the name of the audio format
163 *
164 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
165 * \a name is not a supported audio format.
166 */
167 int get_audio_format_num(const char *name)
168 {
169 int i;
170
171 while (para_isspace(*name))
172 name++;
173 FOR_EACH_AUDIO_FORMAT(i)
174 if (!strcmp(name, audio_formats[i]))
175 return i;
176 return -E_UNSUPPORTED_AUDIO_FORMAT;
177 }
178
179 char *get_time_string(int slot_num)
180 {
181 int ret, seconds = 0, length;
182 struct timeval *tmp, sum, sss, /* server stream start */
183 rstime, /* receiver start time */
184 wstime, /* writer start time */
185 wtime, /* now - writer start */
186 rskip; /* receiver start - sss */
187 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
188 char *msg;
189
190 if (audiod_status == AUDIOD_OFF)
191 goto empty;
192 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
193 if (stat_task->length_seconds) /* paused */
194 return NULL;
195 goto empty; /* stopped */
196 }
197 if (audiod_status == AUDIOD_ON && !s)
198 goto empty;
199 /*
200 * Valid status items and playing, set length and tmp to the stream
201 * start. We use the slot info and fall back to the info from current
202 * status items if no slot info is available.
203 */
204 length = stat_task->length_seconds;
205 tmp = &stat_task->server_stream_start;
206 if (s && s->wns) { /* writer active in this slot */
207 btr_get_node_start(s->wns[0].btrn, &wstime);
208 if (wstime.tv_sec != 0) { /* writer wrote something */
209 if (s->server_stream_start.tv_sec == 0) {
210 /* copy status info to slot */
211 s->server_stream_start = stat_task->server_stream_start;
212 s->offset_seconds = stat_task->offset_seconds;
213 s->seconds_total = stat_task->length_seconds;
214 }
215 length = s->seconds_total;
216 tmp = &s->server_stream_start;
217 }
218 }
219 if (stat_task->sa_time_diff_sign > 0)
220 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
221 else
222 tv_add(tmp, &stat_task->sa_time_diff, &sss);
223 if (!s || !s->wns) {
224 struct timeval diff;
225 tv_diff(now, &sss, &diff);
226 seconds = diff.tv_sec + stat_task->offset_seconds;
227 goto out;
228 }
229 tv_diff(now, &wstime, &wtime);
230 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
231 seconds = s->offset_seconds;
232 btr_get_node_start(s->receiver_node->btrn, &rstime);
233 ret = tv_diff(&rstime, &sss, &rskip);
234 if (ret > 0) { /* audiod was started in the middle of the stream */
235 tv_add(&wtime, &rskip, &sum);
236 seconds += sum.tv_sec;
237 } else
238 seconds += wtime.tv_sec;
239 out:
240 seconds = PARA_MIN(seconds, length);
241 seconds = PARA_MAX(seconds, 0);
242 msg = make_message(
243 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
244 s? "" : "~",
245 seconds / 60,
246 seconds % 60,
247 (length - seconds) / 60,
248 (length - seconds) % 60,
249 length? (seconds * 100 + length / 2) / length : 0,
250 length / 60,
251 length % 60
252 );
253 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
254 return msg;
255 empty:
256 return para_strdup(NULL);
257 }
258
259 static int want_colors(void)
260 {
261 if (conf.color_arg == color_arg_no)
262 return 0;
263 if (conf.color_arg == color_arg_yes)
264 return 1;
265 if (conf.logfile_given)
266 return 0;
267 return isatty(STDERR_FILENO);
268 }
269
270 static void parse_config_or_die(void)
271 {
272 int ret;
273 char *config_file;
274 struct audiod_cmdline_parser_params params = {
275 .override = 0,
276 .initialize = 0,
277 .check_required = 1,
278 .check_ambiguity = 0,
279 .print_errors = 1
280 };
281
282 if (conf.config_file_given)
283 config_file = para_strdup(conf.config_file_arg);
284 else {
285 char *home = para_homedir();
286 config_file = make_message("%s/.paraslash/audiod.conf", home);
287 free(home);
288 }
289 ret = file_exists(config_file);
290 if (conf.config_file_given && !ret) {
291 PARA_EMERG_LOG("can not read config file %s\n", config_file);
292 goto err;
293 }
294 if (ret)
295 audiod_cmdline_parser_config_file(config_file, &conf, &params);
296 free(config_file);
297 daemon_set_loglevel(conf.loglevel_arg);
298 return;
299 err:
300 free(config_file);
301 exit(EXIT_FAILURE);
302 }
303
304 static void setup_signal_handling(void)
305 {
306 sig_task->fd = para_signal_init();
307 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
308 para_install_sighandler(SIGINT);
309 para_install_sighandler(SIGTERM);
310 para_install_sighandler(SIGHUP);
311 para_sigaction(SIGPIPE, SIG_IGN);
312 }
313
314 static void clear_slot(int slot_num)
315 {
316 struct slot_info *s = &slot[slot_num];
317
318 PARA_INFO_LOG("clearing slot %d\n", slot_num);
319 memset(s, 0, sizeof(struct slot_info));
320 s->format = -1;
321 }
322
323 static void close_receiver(int slot_num)
324 {
325 struct slot_info *s = &slot[slot_num];
326 struct audio_format_info *a;
327 struct timeval restart_delay = {0, 200 * 1000};
328
329 if (s->format < 0 || !s->receiver_node)
330 return;
331 a = &afi[s->format];
332 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
333 audio_formats[s->format], slot_num);
334 a->receiver->close(s->receiver_node);
335 btr_free_node(s->receiver_node->btrn);
336 free(s->receiver_node);
337 s->receiver_node = NULL;
338 tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
339 }
340
341 static void writer_cleanup(struct writer_node *wn)
342 {
343 struct writer *w;
344
345 if (!wn)
346 return;
347 w = writers + wn->writer_num;
348 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
349 w->close(wn);
350 btr_free_node(wn->btrn);
351 }
352
353 static void close_writers(struct slot_info *s)
354 {
355 struct audio_format_info *a;
356 int i;
357
358 if (s->format < 0)
359 return;
360 assert(s->wns);
361 a = afi + s->format;
362 if (a->num_writers == 0)
363 writer_cleanup(s->wns);
364 else {
365 for (i = 0; i < a->num_writers; i++)
366 writer_cleanup(s->wns + i);
367 }
368 free(s->wns);
369 s->wns = NULL;
370 }
371
372 static void close_filters(struct slot_info *s)
373 {
374 int i;
375 struct audio_format_info *a = afi + s->format;
376 if (a->num_filters == 0)
377 return;
378 for (i = 0; i < a->num_filters; i++) {
379 struct filter_node *fn = s->fns + i;
380 struct filter *f;
381
382 if (!fn)
383 continue;
384 f = filters + fn->filter_num;
385 if (f->close)
386 f->close(fn);
387 btr_free_node(fn->btrn);
388 }
389 free(s->fns);
390 s->fns = NULL;
391 }
392
393 /*
394 * Whenever a task commits suicide by returning from post_select with t->error
395 * < 0, it also removes its btr node. We do exactly that to kill a running
396 * task. Note that the scheduler checks t->error also _before_ each pre/post
397 * select call, so the victim will never be scheduled again.
398 */
399 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
400 {
401 if (t->error < 0)
402 return;
403 t->error = error;
404 btr_remove_node(btrn);
405 }
406
407 static void kill_all_decoders(int error)
408 {
409 int i, j;
410
411 FOR_EACH_SLOT(i) {
412 struct slot_info *s = &slot[i];
413 struct audio_format_info *a;
414 if (s->format < 0)
415 continue;
416 a = afi + s->format;
417 if (s->wns)
418 for (j = 0; j < a->num_writers; j++)
419 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
420 if (s->fns)
421 for (j = 0; j < a->num_writers; j++)
422 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
423 if (s->receiver_node)
424 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
425 error);
426 }
427 }
428
429 static int get_empty_slot(void)
430 {
431 int i;
432 struct slot_info *s;
433
434 FOR_EACH_SLOT(i) {
435 s = &slot[i];
436 if (s->format < 0) {
437 clear_slot(i);
438 return i;
439 }
440 if (s->wns || s->receiver_node || s->fns)
441 continue;
442 clear_slot(i);
443 return i;
444 }
445 return -E_NO_MORE_SLOTS;
446 }
447
448 /**
449 * get the number of filters
450 *
451 * \param audio_format_num the number identifying the audio format
452 *
453 * \return the number of filters for the given audio format
454 *
455 * \sa struct filter;
456 */
457 int num_filters(int audio_format_num)
458 {
459 return afi[audio_format_num].num_filters;
460 }
461
462 static void open_filters(struct slot_info *s)
463 {
464 struct audio_format_info *a = afi + s->format;
465 struct filter_node *fn;
466 int nf = a->num_filters;
467 struct btr_node *parent;
468 int i;
469
470 if (nf == 0)
471 return;
472 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
473 assert(s->fns == NULL);
474 s->fns = para_calloc(nf * sizeof(struct filter_node));
475 parent = s->receiver_node->btrn;
476 for (i = 0; i < nf; i++) {
477 struct filter *f = filters + a->filter_nums[i];
478 fn = s->fns + i;
479 fn->filter_num = a->filter_nums[i];
480 fn->conf = a->filter_conf[i];
481 fn->task.pre_select = f->pre_select;
482 fn->task.post_select = f->post_select;
483
484 fn->btrn = btr_new_node(&(struct btr_node_description)
485 EMBRACE(.name = f->name, .parent = parent,
486 .handler = f->execute, .context = fn));
487
488 f->open(fn);
489 register_task(&fn->task);
490 parent = fn->btrn;
491 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
492 audio_formats[s->format], i, nf, f->name, s - slot);
493 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
494 }
495 }
496
497 static void open_writers(struct slot_info *s)
498 {
499 int i;
500 struct audio_format_info *a = afi + s->format;
501 struct writer_node *wn;
502 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
503
504 assert(s->wns == NULL);
505 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
506 * sizeof(struct writer_node));
507 if (a->num_writers == 0)
508 setup_writer_node(NULL, parent, s->wns);
509 else {
510 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
511 for (i = 0; i < a->num_writers; i++) {
512 wn = s->wns + i;
513 wn->conf = a->writer_conf[i];
514 wn->writer_num = a->writer_nums[i];
515 register_writer_node(wn, parent);
516 }
517 }
518 }
519
520 /* returns slot num on success */
521 static int open_receiver(int format)
522 {
523 struct audio_format_info *a = &afi[format];
524 struct slot_info *s;
525 int ret, slot_num;
526 struct receiver *r = a->receiver;
527 struct receiver_node *rn;
528 const struct timeval restart_delay = {2, 0};
529
530 ret = get_empty_slot();
531 if (ret < 0)
532 goto err;
533 slot_num = ret;
534 s = &slot[slot_num];
535 s->format = format;
536 s->receiver_node = para_calloc(sizeof(struct receiver_node));
537 rn = s->receiver_node;
538 rn->receiver = r;
539 rn->conf = a->receiver_conf;
540 rn->btrn = btr_new_node(&(struct btr_node_description)
541 EMBRACE(.name = r->name, .context = rn));
542 ret = r->open(rn);
543 if (ret < 0) {
544 btr_free_node(rn->btrn);
545 free(rn);
546 s->receiver_node = NULL;
547 goto err;
548 }
549 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
550 audio_formats[s->format], r->name, slot_num);
551 rn->task.pre_select = r->pre_select;
552 rn->task.post_select = r->post_select;
553 sprintf(rn->task.status, "%s receiver node", r->name);
554 register_task(&rn->task);
555 ret = slot_num;
556 err:
557 if (ret < 0)
558 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
559 tv_add(now, &restart_delay, &afi[format].restart_barrier);
560 return ret;
561 }
562
563 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
564 static int receiver_running(int format)
565 {
566 int i, ret = 0;
567
568 FOR_EACH_SLOT(i) {
569 struct slot_info *s = &slot[i];
570 if (s->format != format)
571 continue;
572 if (!s->receiver_node)
573 continue;
574 if (s->receiver_node->task.error >= 0)
575 return 1;
576 ret = -1;
577 }
578 return ret;
579 }
580
581 struct btr_node *audiod_get_btr_root(void)
582 {
583 int i, newest_slot = -1;
584 struct timeval newest_rstime = {0, 0};
585
586 FOR_EACH_SLOT(i) {
587 struct slot_info *s = &slot[i];
588 struct timeval rstime;
589 if (!s->receiver_node)
590 continue;
591 if (s->receiver_node->task.error < 0)
592 continue;
593 btr_get_node_start(s->receiver_node->btrn, &rstime);
594 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
595 continue;
596 newest_rstime = rstime;
597 newest_slot = i;
598 }
599 if (newest_slot == -1)
600 return NULL;
601 return slot[newest_slot].receiver_node->btrn;
602 }
603
604 /* returns slot num on success. */
605 static int open_current_receiver(struct sched *s)
606 {
607 struct timeval diff;
608 int ret, cafn = stat_task->current_audio_format_num;
609
610 if (cafn < 0 || !stat_task->ct)
611 return -1;
612 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
613 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
614 return -1;
615 ret = receiver_running(cafn);
616 if (ret > 0) /* already running and not eof */
617 return -1;
618 if (ret < 0) { /* eof */
619 /*
620 * para_server uses a zero start time during the announcement
621 * period, i.e. before it sends the first chunk. Wait until
622 * this period begins to avoid restarting the receiver that
623 * belongs to the file just completed.
624 */
625 if (stat_task->server_stream_start.tv_sec != 0) {
626 sched_request_timeout_ms(100, s);
627 return -1;
628 }
629 }
630 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
631 if (tv_diff(&s->timeout, &diff, NULL) > 0)
632 sched_request_timeout(&diff, s);
633 else
634 sched_min_delay(s);
635 return -1;
636 }
637 /* start a new receiver */
638 return open_receiver(cafn);
639 }
640
641 static unsigned compute_time_diff(const struct timeval *status_time)
642 {
643 struct timeval tmp, diff;
644 static unsigned count;
645 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
646 const struct timeval max_deviation = {0, 500 * 1000};
647 const int time_smooth = 5;
648
649 if (!status_time)
650 return count;
651 sign = tv_diff(status_time, now, &diff);
652 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
653 // sign, sa_time_diff_sign);
654 if (!count) {
655 sa_time_diff_sign = sign;
656 stat_task->sa_time_diff = diff;
657 count++;
658 goto out;
659 }
660 if (count > 5) {
661 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
662 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
663 PARA_WARNING_LOG("time diff jump: %lims\n",
664 s * tv2ms(&tmp));
665 }
666 count++;
667 sa_time_diff_sign = tv_convex_combination(
668 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
669 count > 10? sign : sign * time_smooth, &diff,
670 &tmp);
671 stat_task->sa_time_diff = tmp;
672 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
673 sign > 0? "+" : "-",
674 tv2ms(&diff),
675 sa_time_diff_sign ? "+" : "-",
676 tv2ms(&stat_task->sa_time_diff)
677 );
678 out:
679 stat_task->sa_time_diff_sign = sa_time_diff_sign;
680 return count;
681 }
682
683 static int update_item(int itemnum, char *buf)
684 {
685 long unsigned sec, usec;
686
687 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
688 return 1;
689 free(stat_item_values[itemnum]);
690 stat_item_values[itemnum] = para_strdup(buf);
691 stat_client_write_item(itemnum);
692 switch (itemnum) {
693 case SI_STATUS_FLAGS:
694 stat_task->vss_status = 0;
695 if (strchr(buf, 'N'))
696 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
697 if (strchr(buf, 'P'))
698 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
699 break;
700 case SI_OFFSET:
701 stat_task->offset_seconds = atoi(buf);
702 break;
703 case SI_SECONDS_TOTAL:
704 stat_task->length_seconds = atoi(buf);
705 break;
706 case SI_STREAM_START:
707 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
708 struct timeval a_start, delay;
709 delay.tv_sec = conf.stream_delay_arg / 1000;
710 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
711 stat_task->server_stream_start.tv_sec = sec;
712 stat_task->server_stream_start.tv_usec = usec;
713 if (compute_time_diff(NULL) > 2) {
714 if (stat_task->sa_time_diff_sign < 0)
715 tv_add(&stat_task->server_stream_start,
716 &stat_task->sa_time_diff, &a_start);
717 else
718 tv_diff(&stat_task->server_stream_start,
719 &stat_task->sa_time_diff, &a_start);
720 tv_add(&a_start, &delay, &initial_delay_barrier);
721 }
722 }
723 break;
724 case SI_CURRENT_TIME:
725 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
726 struct timeval tv = {sec, usec};
727 compute_time_diff(&tv);
728 }
729 break;
730 case SI_FORMAT:
731 stat_task->current_audio_format_num
732 = get_audio_format_num(buf);
733 }
734 return 1;
735 }
736
737 static int parse_stream_command(const char *txt, char **cmd)
738 {
739 char *p = strchr(txt, ':');
740 int i;
741
742 if (!p)
743 return -E_MISSING_COLON;
744 p++;
745 FOR_EACH_AUDIO_FORMAT(i) {
746 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
747 continue;
748 *cmd = p;
749 return i;
750 }
751 return -E_UNSUPPORTED_AUDIO_FORMAT;
752 }
753
754 static int add_filter(int format, char *cmdline)
755 {
756 struct audio_format_info *a = &afi[format];
757 int filter_num, nf = a->num_filters;
758
759 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
760 if (filter_num < 0)
761 return filter_num;
762 a->filter_nums[nf] = filter_num;
763 a->num_filters++;
764 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
765 filters[filter_num].name);
766 return filter_num;
767 }
768
769 static int parse_writer_args(void)
770 {
771 int i, ret, nw;
772 char *cmd;
773 struct audio_format_info *a;
774
775 nw = PARA_MAX(1U, conf.writer_given);
776 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
777 FOR_EACH_AUDIO_FORMAT(i) {
778 a = &afi[i];
779 a->writer_conf = para_malloc(nw * sizeof(void *));
780 a->writer_nums = para_malloc(nw * sizeof(int));
781 a->num_writers = 0;
782 }
783 for (i = 0; i < conf.writer_given; i++) {
784 void *wconf;
785 int writer_num;
786 ret = parse_stream_command(conf.writer_arg[i], &cmd);
787 if (ret < 0)
788 goto out;
789 a = &afi[ret];
790 nw = a->num_writers;
791 wconf = check_writer_arg(cmd, &writer_num);
792 if (!wconf) {
793 ret = writer_num;
794 goto out;
795 }
796 a->writer_nums[nw] = writer_num;
797 a->writer_conf[nw] = wconf;
798 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
799 nw, writer_names[writer_num]);
800 a->num_writers++;
801 }
802 ret = 1;
803 out:
804 return ret;
805 }
806
807 static int parse_receiver_args(void)
808 {
809 int i, ret, receiver_num;
810 char *cmd = NULL;
811 struct audio_format_info *a;
812
813 for (i = conf.receiver_given - 1; i >= 0; i--) {
814 char *arg = conf.receiver_arg[i];
815 char *recv_arg = strchr(arg, ':');
816 ret = -E_MISSING_COLON;
817 if (!recv_arg)
818 goto out;
819 *recv_arg = '\0';
820 recv_arg++;
821 ret = get_audio_format_num(arg);
822 if (ret < 0)
823 goto out;
824 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
825 if (!afi[ret].receiver_conf) {
826 ret = -E_RECV_SYNTAX;
827 goto out;
828 }
829 afi[ret].receiver = &receivers[receiver_num];
830 }
831 /* use the first available receiver with no arguments
832 * for those audio formats for which no receiver
833 * was specified
834 */
835 cmd = para_strdup(receivers[0].name);
836 FOR_EACH_AUDIO_FORMAT(i) {
837 a = &afi[i];
838 if (a->receiver_conf)
839 continue;
840 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
841 if (!a->receiver_conf)
842 return -E_RECV_SYNTAX;
843 a->receiver = &receivers[receiver_num];
844 }
845 ret = 1;
846 out:
847 free(cmd);
848 return ret;
849 }
850
851 static int init_default_filters(void)
852 {
853 int i, ret = 1;
854
855 FOR_EACH_AUDIO_FORMAT(i) {
856 struct audio_format_info *a = &afi[i];
857 char *tmp;
858 int j;
859
860 if (a->num_filters)
861 continue; /* no default -- nothing to to */
862 /* add "dec" to audio format name */
863 tmp = make_message("%sdec", audio_formats[i]);
864 for (j = 0; filters[j].name; j++)
865 if (!strcmp(tmp, filters[j].name))
866 break;
867 free(tmp);
868 ret = -E_UNSUPPORTED_FILTER;
869 if (!filters[j].name)
870 goto out;
871 tmp = para_strdup(filters[j].name);
872 ret = add_filter(i, tmp);
873 free(tmp);
874 if (ret < 0)
875 goto out;
876 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
877 filters[j].name);
878 }
879 out:
880 return ret;
881 }
882
883 static int parse_filter_args(void)
884 {
885 int i, ret, nf;
886
887 nf = PARA_MAX(1U, conf.filter_given);
888 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
889 FOR_EACH_AUDIO_FORMAT(i) {
890 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
891 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
892 }
893 if (!conf.no_default_filters_given)
894 return init_default_filters();
895 for (i = 0; i < conf.filter_given; i++) {
896 char *arg = conf.filter_arg[i];
897 char *filter_name = strchr(arg, ':');
898 ret = -E_MISSING_COLON;
899 if (!filter_name)
900 goto out;
901 *filter_name = '\0';
902 filter_name++;
903 ret = get_audio_format_num(arg);
904 if (ret < 0)
905 goto out;
906 ret = add_filter(ret, filter_name);
907 if (ret < 0)
908 goto out;
909 }
910 ret = init_default_filters(); /* use default values for the rest */
911 out:
912 return ret;
913 }
914
915 static int parse_stream_args(void)
916 {
917 int ret;
918
919 ret = parse_receiver_args();
920 if (ret < 0)
921 return ret;
922 ret = parse_filter_args();
923 if (ret < 0)
924 return ret;
925 ret = parse_writer_args();
926 if (ret < 0)
927 return ret;
928 return 1;
929 }
930
931 /* does not unlink socket on errors */
932 static int audiod_get_socket(void)
933 {
934 struct sockaddr_un unix_addr;
935 int ret, fd;
936
937 if (conf.socket_given)
938 socket_name = para_strdup(conf.socket_arg);
939 else {
940 char *hn = para_hostname();
941 socket_name = make_message("/var/paraslash/audiod_socket.%s",
942 hn);
943 free(hn);
944 }
945 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
946 if (conf.force_given)
947 unlink(socket_name);
948 ret = create_local_socket(socket_name, &unix_addr,
949 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
950 if (ret < 0)
951 goto err;
952 fd = ret;
953 if (listen(fd , 5) < 0) {
954 ret = -ERRNO_TO_PARA_ERROR(errno);
955 goto err;
956 }
957 ret = mark_fd_nonblocking(fd);
958 if (ret < 0)
959 goto err;
960 return fd;
961 err:
962 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
963 exit(EXIT_FAILURE);
964 }
965
966 static void signal_pre_select(struct sched *s, struct task *t)
967 {
968 struct signal_task *st = container_of(t, struct signal_task, task);
969 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
970 }
971
972 static void signal_post_select(struct sched *s, struct task *t)
973 {
974 struct signal_task *st = container_of(t, struct signal_task, task);
975
976 if (!FD_ISSET(st->fd, &s->rfds))
977 return;
978
979 st->signum = para_next_signal();
980 switch (st->signum) {
981 case SIGINT:
982 case SIGTERM:
983 case SIGHUP:
984 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
985 clean_exit(EXIT_FAILURE, "caught deadly signal");
986 }
987 }
988
989 static void signal_setup_default(struct signal_task *st)
990 {
991 st->task.pre_select = signal_pre_select;
992 st->task.post_select = signal_post_select;
993 sprintf(st->task.status, "signal task");
994 }
995
996 static void command_pre_select(struct sched *s, struct task *t)
997 {
998 struct command_task *ct = container_of(t, struct command_task, task);
999 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1000 }
1001
1002 static void command_post_select(struct sched *s, struct task *t)
1003 {
1004 int ret;
1005 struct command_task *ct = container_of(t, struct command_task, task);
1006 static struct timeval last_status_dump;
1007 struct timeval tmp, delay = {0, 500 * 1000};
1008
1009 tv_add(&last_status_dump, &delay, &tmp);
1010 if (tv_diff(&tmp, now, NULL) < 0) {
1011 audiod_status_dump();
1012 last_status_dump = *now;
1013 }
1014
1015 if (!FD_ISSET(ct->fd, &s->rfds))
1016 return;
1017 ret = handle_connect(ct->fd);
1018 if (ret < 0)
1019 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1020 }
1021
1022 static void init_command_task(struct command_task *ct)
1023 {
1024 ct->task.pre_select = command_pre_select;
1025 ct->task.post_select = command_post_select;
1026 ct->task.error = 0;
1027 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1028 sprintf(ct->task.status, "command task");
1029 }
1030
1031 static void close_stat_pipe(void)
1032 {
1033 if (!stat_task->ct)
1034 return;
1035 client_close(stat_task->ct);
1036 stat_task->ct = NULL;
1037 clear_and_dump_items();
1038 stat_task->length_seconds = 0;
1039 stat_task->offset_seconds = 0;
1040 stat_task->vss_status = 0;
1041 stat_task->current_audio_format_num = -1;
1042 audiod_status_dump();
1043 }
1044
1045 /**
1046 * close the connection to para_server and exit
1047 *
1048 * \param status the exit status which is passed to exit(3)
1049 * \param msg the log message
1050 *
1051 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1052 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1053 * EXIT_FAILURE.
1054 *
1055 * \sa exit(3)
1056 */
1057 void __noreturn clean_exit(int status, const char *msg)
1058 {
1059 PARA_EMERG_LOG("%s\n", msg);
1060 if (socket_name)
1061 unlink(socket_name);
1062 close_stat_pipe();
1063 exit(status);
1064 }
1065
1066 /* avoid busy loop if server is down */
1067 static void set_stat_task_restart_barrier(unsigned seconds)
1068 {
1069 struct timeval delay = {seconds, 0};
1070 tv_add(now, &delay, &stat_task->restart_barrier);
1071 }
1072
1073 static bool try_to_close_slot(int slot_num)
1074 {
1075 struct slot_info *s = &slot[slot_num];
1076 struct audio_format_info *a = afi + s->format;
1077 int i;
1078
1079 if (s->format < 0)
1080 return false;
1081 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1082 return false;
1083 for (i = 0; i < a->num_filters; i++)
1084 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1085 return false;
1086 if (a->num_writers > 0) {
1087 for (i = 0; i < a->num_writers; i++)
1088 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1089 return false;
1090 } else {
1091 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1092 return false;
1093 }
1094 PARA_INFO_LOG("closing slot %d\n", slot_num);
1095 close_writers(s);
1096 close_filters(s);
1097 close_receiver(slot_num);
1098 clear_slot(slot_num);
1099 return true;
1100 }
1101
1102 /*
1103 * Check if any receivers/filters/writers need to be started and do so if
1104 * necessary.
1105 */
1106 static void start_stop_decoders(struct sched *s)
1107 {
1108 int i, ret;
1109 struct slot_info *sl;
1110 struct audio_format_info *a;
1111
1112 FOR_EACH_SLOT(i)
1113 if (try_to_close_slot(i))
1114 sched_min_delay(s);
1115 if (audiod_status != AUDIOD_ON ||
1116 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1117 return kill_all_decoders(-E_NOT_PLAYING);
1118 ret = open_current_receiver(s);
1119 if (ret < 0)
1120 return;
1121 sl = slot + ret;
1122 a = afi + sl->format;
1123 if (a->num_filters)
1124 open_filters(sl);
1125 open_writers(sl);
1126 activate_grab_clients();
1127 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1128 sched_min_delay(s);
1129 }
1130
1131 /* restart the client task if necessary */
1132 static void status_pre_select(struct sched *s, struct task *t)
1133 {
1134 struct status_task *st = container_of(t, struct status_task, task);
1135
1136 if (audiod_status == AUDIOD_OFF) {
1137 if (!st->ct)
1138 goto out;
1139 if (st->ct->task.error >= 0) {
1140 st->ct->task.error = -E_AUDIOD_OFF;
1141 goto out;
1142 }
1143 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1144 goto out;
1145 close_stat_pipe();
1146 st->clock_diff_count = conf.clock_diff_count_arg;
1147 goto out;
1148 }
1149 if (st->ct) {
1150 int ret;
1151 if (st->ct->task.error < 0) {
1152 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1153 goto out;
1154 close_stat_pipe();
1155 goto out;
1156 }
1157 if (st->ct->status != CL_RECEIVING)
1158 goto out;
1159 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1160 update_item);
1161 if (ret < 0) {
1162 st->ct->task.error = ret;
1163 goto out;
1164 }
1165 if (st->ct->loaded != ret) {
1166 st->last_status_read = *now;
1167 st->ct->loaded = ret;
1168 } else {
1169 struct timeval diff;
1170 tv_diff(now, &st->last_status_read, &diff);
1171 if (diff.tv_sec > 61)
1172 st->ct->task.error = -E_STATUS_TIMEOUT;
1173 }
1174 goto out;
1175 }
1176 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1177 goto out;
1178 if (st->clock_diff_count) { /* get status only one time */
1179 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1180 int argc = 5;
1181 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1182 st->clock_diff_count--;
1183 client_open(argc, argv, &st->ct, NULL);
1184 set_stat_task_restart_barrier(2);
1185 sched_min_delay(s);
1186
1187 } else {
1188 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1189 int argc = 4;
1190 client_open(argc, argv, &st->ct, NULL);
1191 set_stat_task_restart_barrier(5);
1192 sched_min_delay(s);
1193 }
1194 free(stat_item_values[SI_BASENAME]);
1195 stat_item_values[SI_BASENAME] = para_strdup(
1196 "no connection to para_server");
1197 stat_client_write_item(SI_BASENAME);
1198 st->last_status_read = *now;
1199 out:
1200 start_stop_decoders(s);
1201 }
1202
1203 static void init_status_task(struct status_task *st)
1204 {
1205 memset(st, 0, sizeof(struct status_task));
1206 st->task.pre_select = status_pre_select;
1207 st->sa_time_diff_sign = 1;
1208 st->clock_diff_count = conf.clock_diff_count_arg;
1209 st->current_audio_format_num = -1;
1210 sprintf(st->task.status, "status task");
1211 }
1212
1213 static void set_initial_status(void)
1214 {
1215 audiod_status = AUDIOD_ON;
1216 if (!conf.mode_given)
1217 return;
1218 if (!strcmp(conf.mode_arg, "sb")) {
1219 audiod_status = AUDIOD_STANDBY;
1220 return;
1221 }
1222 if (!strcmp(conf.mode_arg, "off")) {
1223 audiod_status = AUDIOD_OFF;
1224 return;
1225 }
1226 if (strcmp(conf.mode_arg, "on"))
1227 PARA_WARNING_LOG("invalid mode\n");
1228 }
1229
1230 __noreturn static void print_help_and_die(void)
1231 {
1232 int d = conf.detailed_help_given;
1233 const char **p = d? audiod_args_info_detailed_help
1234 : audiod_args_info_help;
1235
1236 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1237 AUDIOD_CMDLINE_PARSER_VERSION);
1238 printf_or_die("%s\n\n", audiod_args_info_usage);
1239 for (; *p; p++)
1240 printf_or_die("%s\n", *p);
1241 print_receiver_helps(d);
1242 print_filter_helps(d);
1243 print_writer_helps(d);
1244 exit(0);
1245 }
1246
1247 static void init_colors_or_die(void)
1248 {
1249 int ret, i;
1250
1251 if (!want_colors())
1252 return;
1253 daemon_set_default_log_colors();
1254 daemon_set_flag(DF_COLOR_LOG);
1255 for (i = 0; i < conf.log_color_given; i++) {
1256 ret = daemon_set_log_color(conf.log_color_arg[i]);
1257 if (ret < 0)
1258 exit(EXIT_FAILURE);
1259 }
1260 }
1261
1262 /**
1263 * the main function of para_audiod
1264 *
1265 * \param argc usual argument count
1266 * \param argv usual argument vector
1267 *
1268 * \return EXIT_SUCCESS or EXIT_FAILURE
1269 *
1270 * \sa para_audiod(1)
1271 * */
1272 int main(int argc, char *argv[])
1273 {
1274 int ret, i;
1275 static struct sched s;
1276 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1277 struct audiod_cmdline_parser_params params = {
1278 .override = 0,
1279 .initialize = 1,
1280 .check_required = 0,
1281 .check_ambiguity = 0,
1282 .print_errors = 1
1283 };
1284
1285 valid_fd_012();
1286 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1287 exit(EXIT_FAILURE);
1288 HANDLE_VERSION_FLAG("audiod", conf);
1289 /* init receivers/filters/writers early to make help work */
1290 recv_init();
1291 filter_init();
1292 writer_init();
1293 if (conf.help_given || conf.detailed_help_given)
1294 print_help_and_die();
1295 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1296 parse_config_or_die();
1297 init_colors_or_die();
1298 init_random_seed_or_die();
1299 daemon_set_flag(DF_LOG_TIME);
1300 daemon_set_flag(DF_LOG_HOSTNAME);
1301 daemon_set_flag(DF_LOG_LL);
1302 if (conf.log_timing_given)
1303 daemon_set_flag(DF_LOG_TIMING);
1304 if (conf.logfile_given) {
1305 daemon_set_logfile(conf.logfile_arg);
1306 daemon_open_log_or_die();
1307 }
1308 ret = parse_stream_args();
1309 if (ret < 0) {
1310 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1311 exit(EXIT_FAILURE);
1312 }
1313 log_welcome("para_audiod");
1314 server_uptime(UPTIME_SET);
1315 set_initial_status();
1316 FOR_EACH_SLOT(i)
1317 clear_slot(i);
1318 setup_signal_handling();
1319 signal_setup_default(sig_task);
1320
1321 init_status_task(stat_task);
1322 init_command_task(cmd_task);
1323
1324 if (conf.daemon_given)
1325 daemonize();
1326
1327 register_task(&sig_task->task);
1328 register_task(&cmd_task->task);
1329 register_task(&stat_task->task);
1330 s.default_timeout.tv_sec = 2;
1331 s.default_timeout.tv_usec = 999 * 1000;
1332 ret = schedule(&s);
1333
1334 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1335 return EXIT_FAILURE;
1336 }