1663dad3d88e8bb90ec69e2f7cffa1bcbd2ce64e
[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 /* The status task btrn is the child of the client task. */
114 struct btr_node *btrn;
115 };
116
117 /** The array of status items sent by para_server. */
118 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
119
120 /**
121 * the current mode of operation of which can be changed by the on/off/cycle
122 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
123 */
124 int audiod_status = AUDIOD_ON;
125
126 /**
127 * the gengetopt args_info struct that holds information on all command line
128 * arguments
129 */
130 struct audiod_args_info conf;
131
132 static char *socket_name;
133 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
134
135 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
136
137 static struct status_task status_task_struct;
138
139 /**
140 * the task that calls the status command of para_server
141 *
142 * \sa struct status_task
143 */
144 static struct status_task *stat_task = &status_task_struct;
145 static struct timeval initial_delay_barrier;
146
147 /**
148 * the task for handling audiod commands
149 *
150 * \sa struct task, struct sched
151 */
152 struct command_task {
153 /** the local listening socket */
154 int fd;
155 /** the associated task structure */
156 struct task task;
157 };
158
159 /** iterate over all supported audio formats */
160 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
161
162 /**
163 * Get the audio format number.
164 *
165 * \param name The name of the audio format.
166 *
167 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
168 * \a name is not a supported audio format.
169 */
170 int get_audio_format_num(const char *name)
171 {
172 int i;
173
174 while (para_isspace(*name))
175 name++;
176 FOR_EACH_AUDIO_FORMAT(i)
177 if (!strcmp(name, audio_formats[i]))
178 return i;
179 return -E_UNSUPPORTED_AUDIO_FORMAT;
180 }
181
182 /**
183 * Compute the play time based on information of the given slot.
184 *
185 * \param slot_num The slot number (negative means: no slot).
186 *
187 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
188 * from the status items received from para_server and the start time of the
189 * (first) writer of the given slot.
190 *
191 * It has to to take into account that probably the stream was not started at
192 * the beginning of the file, that the clock between the server and the client
193 * host may differ and that playback of the stream was delayed, e.g. because
194 * the prebuffer filter is used in the filter chain of the given slot.
195 *
196 * If no writer is active in the given slot, or \a slot_num is negative
197 * (indicating that para_audiod runs in standby mode), an approximation based
198 * only on the status items is computed and the returned string is prefixed
199 * with "~".
200 *
201 * \return A string that must be freed by the caller.
202 */
203 char *get_time_string(int slot_num)
204 {
205 int ret, seconds = 0, length;
206 struct timeval *tmp, sum, sss, /* server stream start */
207 rstime, /* receiver start time */
208 wstime, /* writer start time */
209 wtime, /* now - writer start */
210 rskip; /* receiver start - sss */
211 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
212 char *msg;
213
214 if (audiod_status == AUDIOD_OFF)
215 goto empty;
216 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
217 if (stat_task->length_seconds) /* paused */
218 return NULL;
219 goto empty; /* stopped */
220 }
221 if (audiod_status == AUDIOD_ON && !s)
222 goto empty;
223 /*
224 * Valid status items and playing, set length and tmp to the stream
225 * start. We use the slot info and fall back to the info from current
226 * status items if no slot info is available.
227 */
228 length = stat_task->length_seconds;
229 tmp = &stat_task->server_stream_start;
230 if (s && s->wns) { /* writer active in this slot */
231 btr_get_node_start(s->wns[0].btrn, &wstime);
232 if (wstime.tv_sec != 0) { /* writer wrote something */
233 if (s->server_stream_start.tv_sec == 0) {
234 /* copy status info to slot */
235 s->server_stream_start = stat_task->server_stream_start;
236 s->offset_seconds = stat_task->offset_seconds;
237 s->seconds_total = stat_task->length_seconds;
238 }
239 length = s->seconds_total;
240 tmp = &s->server_stream_start;
241 }
242 }
243 if (stat_task->sa_time_diff_sign > 0)
244 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
245 else
246 tv_add(tmp, &stat_task->sa_time_diff, &sss);
247 if (!s || !s->wns) {
248 struct timeval diff;
249 tv_diff(now, &sss, &diff);
250 seconds = diff.tv_sec + stat_task->offset_seconds;
251 goto out;
252 }
253 tv_diff(now, &wstime, &wtime);
254 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
255 seconds = s->offset_seconds;
256 btr_get_node_start(s->receiver_node->btrn, &rstime);
257 ret = tv_diff(&rstime, &sss, &rskip);
258 if (ret > 0) { /* audiod was started in the middle of the stream */
259 tv_add(&wtime, &rskip, &sum);
260 seconds += sum.tv_sec;
261 } else
262 seconds += wtime.tv_sec;
263 out:
264 seconds = PARA_MIN(seconds, length);
265 seconds = PARA_MAX(seconds, 0);
266 msg = make_message(
267 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
268 s? "" : "~",
269 seconds / 60,
270 seconds % 60,
271 (length - seconds) / 60,
272 (length - seconds) % 60,
273 length? (seconds * 100 + length / 2) / length : 0,
274 length / 60,
275 length % 60
276 );
277 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
278 return msg;
279 empty:
280 return para_strdup(NULL);
281 }
282
283 static int want_colors(void)
284 {
285 if (conf.color_arg == color_arg_no)
286 return 0;
287 if (conf.color_arg == color_arg_yes)
288 return 1;
289 if (conf.logfile_given)
290 return 0;
291 return isatty(STDERR_FILENO);
292 }
293
294 static void parse_config_or_die(void)
295 {
296 int ret;
297 char *config_file;
298 struct audiod_cmdline_parser_params params = {
299 .override = 0,
300 .initialize = 0,
301 .check_required = 1,
302 .check_ambiguity = 0,
303 .print_errors = 1
304 };
305
306 if (conf.config_file_given)
307 config_file = para_strdup(conf.config_file_arg);
308 else {
309 char *home = para_homedir();
310 config_file = make_message("%s/.paraslash/audiod.conf", home);
311 free(home);
312 }
313 ret = file_exists(config_file);
314 if (conf.config_file_given && !ret) {
315 PARA_EMERG_LOG("can not read config file %s\n", config_file);
316 goto err;
317 }
318 if (ret)
319 audiod_cmdline_parser_config_file(config_file, &conf, &params);
320 free(config_file);
321 daemon_set_loglevel(conf.loglevel_arg);
322 return;
323 err:
324 free(config_file);
325 exit(EXIT_FAILURE);
326 }
327
328 static void setup_signal_handling(void)
329 {
330 sig_task->fd = para_signal_init();
331 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
332 para_install_sighandler(SIGINT);
333 para_install_sighandler(SIGTERM);
334 para_install_sighandler(SIGHUP);
335 para_sigaction(SIGPIPE, SIG_IGN);
336 }
337
338 static void clear_slot(int slot_num)
339 {
340 struct slot_info *s = &slot[slot_num];
341
342 PARA_INFO_LOG("clearing slot %d\n", slot_num);
343 memset(s, 0, sizeof(struct slot_info));
344 s->format = -1;
345 }
346
347 static void close_receiver(int slot_num)
348 {
349 struct slot_info *s = &slot[slot_num];
350 struct audio_format_info *a;
351 struct timeval restart_delay = {0, 200 * 1000};
352
353 if (s->format < 0 || !s->receiver_node)
354 return;
355 a = &afi[s->format];
356 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
357 audio_formats[s->format], slot_num);
358 a->receiver->close(s->receiver_node);
359 btr_free_node(s->receiver_node->btrn);
360 free(s->receiver_node);
361 s->receiver_node = NULL;
362 tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
363 }
364
365 static void writer_cleanup(struct writer_node *wn)
366 {
367 struct writer *w;
368
369 if (!wn)
370 return;
371 w = writers + wn->writer_num;
372 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
373 w->close(wn);
374 btr_free_node(wn->btrn);
375 }
376
377 static void close_writers(struct slot_info *s)
378 {
379 struct audio_format_info *a;
380 int i;
381
382 if (s->format < 0)
383 return;
384 assert(s->wns);
385 a = afi + s->format;
386 if (a->num_writers == 0)
387 writer_cleanup(s->wns);
388 else {
389 for (i = 0; i < a->num_writers; i++)
390 writer_cleanup(s->wns + i);
391 }
392 free(s->wns);
393 s->wns = NULL;
394 }
395
396 static void close_filters(struct slot_info *s)
397 {
398 int i;
399 struct audio_format_info *a = afi + s->format;
400 if (a->num_filters == 0)
401 return;
402 for (i = 0; i < a->num_filters; i++) {
403 struct filter_node *fn = s->fns + i;
404 struct filter *f;
405
406 if (!fn)
407 continue;
408 f = filters + fn->filter_num;
409 if (f->close)
410 f->close(fn);
411 btr_free_node(fn->btrn);
412 }
413 free(s->fns);
414 s->fns = NULL;
415 }
416
417 /*
418 * Whenever a task commits suicide by returning from post_select with t->error
419 * < 0, it also removes its btr node. We do exactly that to kill a running
420 * task. Note that the scheduler checks t->error also _before_ each pre/post
421 * select call, so the victim will never be scheduled again.
422 */
423 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
424 {
425 if (t->error < 0)
426 return;
427 t->error = error;
428 btr_remove_node(btrn);
429 }
430
431 static void kill_all_decoders(int error)
432 {
433 int i, j;
434
435 FOR_EACH_SLOT(i) {
436 struct slot_info *s = &slot[i];
437 struct audio_format_info *a;
438 if (s->format < 0)
439 continue;
440 a = afi + s->format;
441 if (s->wns)
442 for (j = 0; j < a->num_writers; j++)
443 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
444 if (s->fns)
445 for (j = 0; j < a->num_writers; j++)
446 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
447 if (s->receiver_node)
448 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
449 error);
450 }
451 }
452
453 static int get_empty_slot(void)
454 {
455 int i;
456 struct slot_info *s;
457
458 FOR_EACH_SLOT(i) {
459 s = &slot[i];
460 if (s->format < 0) {
461 clear_slot(i);
462 return i;
463 }
464 if (s->wns || s->receiver_node || s->fns)
465 continue;
466 clear_slot(i);
467 return i;
468 }
469 return -E_NO_MORE_SLOTS;
470 }
471
472 /**
473 * get the number of filters
474 *
475 * \param audio_format_num the number identifying the audio format
476 *
477 * \return the number of filters for the given audio format
478 *
479 * \sa struct filter;
480 */
481 int num_filters(int audio_format_num)
482 {
483 return afi[audio_format_num].num_filters;
484 }
485
486 static void open_filters(struct slot_info *s)
487 {
488 struct audio_format_info *a = afi + s->format;
489 struct filter_node *fn;
490 int nf = a->num_filters;
491 struct btr_node *parent;
492 int i;
493
494 if (nf == 0)
495 return;
496 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
497 assert(s->fns == NULL);
498 s->fns = para_calloc(nf * sizeof(struct filter_node));
499 parent = s->receiver_node->btrn;
500 for (i = 0; i < nf; i++) {
501 struct filter *f = filters + a->filter_nums[i];
502 fn = s->fns + i;
503 fn->filter_num = a->filter_nums[i];
504 fn->conf = a->filter_conf[i];
505 fn->task.pre_select = f->pre_select;
506 fn->task.post_select = f->post_select;
507
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 register_task(&fn->task);
514 parent = fn->btrn;
515 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
516 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
517 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
518 }
519 }
520
521 static void open_writers(struct slot_info *s)
522 {
523 int i;
524 struct audio_format_info *a = afi + s->format;
525 struct writer_node *wn;
526 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
527
528 assert(s->wns == NULL);
529 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
530 * sizeof(struct writer_node));
531 if (a->num_writers == 0)
532 setup_writer_node(NULL, parent, s->wns);
533 else {
534 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
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);
540 }
541 }
542 }
543
544 /* returns slot num on success */
545 static int open_receiver(int format)
546 {
547 struct audio_format_info *a = &afi[format];
548 struct slot_info *s;
549 int ret, slot_num;
550 struct receiver *r = a->receiver;
551 struct receiver_node *rn;
552 const struct timeval restart_delay = {2, 0};
553
554 ret = get_empty_slot();
555 if (ret < 0)
556 goto err;
557 slot_num = ret;
558 s = &slot[slot_num];
559 s->format = format;
560 s->receiver_node = para_calloc(sizeof(struct receiver_node));
561 rn = s->receiver_node;
562 rn->receiver = r;
563 rn->conf = a->receiver_conf;
564 rn->btrn = btr_new_node(&(struct btr_node_description)
565 EMBRACE(.name = r->name, .context = rn));
566 ret = r->open(rn);
567 if (ret < 0) {
568 btr_free_node(rn->btrn);
569 free(rn);
570 s->receiver_node = NULL;
571 goto err;
572 }
573 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
574 audio_formats[s->format], r->name, slot_num);
575 rn->task.pre_select = r->pre_select;
576 rn->task.post_select = r->post_select;
577 sprintf(rn->task.status, "%s receiver node", r->name);
578 register_task(&rn->task);
579 ret = slot_num;
580 err:
581 if (ret < 0)
582 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
583 tv_add(now, &restart_delay, &afi[format].restart_barrier);
584 return ret;
585 }
586
587 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
588 static int receiver_running(int format)
589 {
590 int i, ret = 0;
591
592 FOR_EACH_SLOT(i) {
593 struct slot_info *s = &slot[i];
594 if (s->format != format)
595 continue;
596 if (!s->receiver_node)
597 continue;
598 if (s->receiver_node->task.error >= 0)
599 return 1;
600 ret = -1;
601 }
602 return ret;
603 }
604
605 /**
606 * Return the root node of the current buffer tree.
607 *
608 * This is only used for stream grabbing.
609 *
610 * \return \p NULL if no slot is currently active. If more than one buffer tree
611 * exists, the node corresponding to the most recently started receiver is
612 * returned.
613 */
614 struct btr_node *audiod_get_btr_root(void)
615 {
616 int i, newest_slot = -1;
617 struct timeval newest_rstime = {0, 0};
618
619 FOR_EACH_SLOT(i) {
620 struct slot_info *s = &slot[i];
621 struct timeval rstime;
622 if (!s->receiver_node)
623 continue;
624 if (s->receiver_node->task.error < 0)
625 continue;
626 btr_get_node_start(s->receiver_node->btrn, &rstime);
627 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
628 continue;
629 newest_rstime = rstime;
630 newest_slot = i;
631 }
632 if (newest_slot == -1)
633 return NULL;
634 return slot[newest_slot].receiver_node->btrn;
635 }
636
637 /* whether a new instance of a decoder should be started. */
638 static bool must_start_decoder(void)
639 {
640 int ret, cafn = stat_task->current_audio_format_num;
641
642 if (cafn < 0 || !stat_task->ct)
643 return false;
644 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
645 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
646 return false;
647 ret = receiver_running(cafn);
648 if (ret != 0) /* already running */
649 return false;
650 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
651 return false;
652 return true;
653 }
654
655 static unsigned compute_time_diff(const struct timeval *status_time)
656 {
657 struct timeval tmp, diff;
658 static unsigned count;
659 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
660 const struct timeval max_deviation = {0, 500 * 1000};
661 const int time_smooth = 5;
662
663 if (!status_time)
664 return count;
665 sign = tv_diff(status_time, now, &diff);
666 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
667 // sign, sa_time_diff_sign);
668 if (!count) {
669 sa_time_diff_sign = sign;
670 stat_task->sa_time_diff = diff;
671 count++;
672 goto out;
673 }
674 if (count > 5) {
675 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
676 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
677 PARA_WARNING_LOG("time diff jump: %lims\n",
678 s * tv2ms(&tmp));
679 }
680 count++;
681 sa_time_diff_sign = tv_convex_combination(
682 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
683 count > 10? sign : sign * time_smooth, &diff,
684 &tmp);
685 stat_task->sa_time_diff = tmp;
686 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
687 sign < 0? "-" : "+",
688 tv2ms(&diff),
689 sa_time_diff_sign < 0? "-" : "+",
690 tv2ms(&stat_task->sa_time_diff)
691 );
692 out:
693 stat_task->sa_time_diff_sign = sa_time_diff_sign;
694 return count;
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 struct timeval a_start, delay;
723 delay.tv_sec = conf.stream_delay_arg / 1000;
724 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
725 stat_task->server_stream_start.tv_sec = sec;
726 stat_task->server_stream_start.tv_usec = usec;
727 if (compute_time_diff(NULL) > 2) {
728 if (stat_task->sa_time_diff_sign < 0)
729 tv_add(&stat_task->server_stream_start,
730 &stat_task->sa_time_diff, &a_start);
731 else
732 tv_diff(&stat_task->server_stream_start,
733 &stat_task->sa_time_diff, &a_start);
734 tv_add(&a_start, &delay, &initial_delay_barrier);
735 }
736 }
737 break;
738 case SI_CURRENT_TIME:
739 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
740 struct timeval tv = {sec, usec};
741 compute_time_diff(&tv);
742 }
743 break;
744 case SI_FORMAT:
745 stat_task->current_audio_format_num
746 = get_audio_format_num(buf);
747 }
748 return 1;
749 }
750
751 static int parse_stream_command(const char *txt, char **cmd)
752 {
753 char *p = strchr(txt, ':');
754 int i;
755
756 if (!p)
757 return -E_MISSING_COLON;
758 p++;
759 FOR_EACH_AUDIO_FORMAT(i) {
760 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
761 continue;
762 *cmd = p;
763 return i;
764 }
765 return -E_UNSUPPORTED_AUDIO_FORMAT;
766 }
767
768 static int add_filter(int format, char *cmdline)
769 {
770 struct audio_format_info *a = &afi[format];
771 int filter_num, nf = a->num_filters;
772
773 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
774 if (filter_num < 0)
775 return filter_num;
776 a->filter_nums[nf] = filter_num;
777 a->num_filters++;
778 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
779 filters[filter_num].name);
780 return filter_num;
781 }
782
783 static int parse_writer_args(void)
784 {
785 int i, ret, nw;
786 char *cmd;
787 struct audio_format_info *a;
788
789 nw = PARA_MAX(1U, conf.writer_given);
790 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
791 FOR_EACH_AUDIO_FORMAT(i) {
792 a = &afi[i];
793 a->writer_conf = para_malloc(nw * sizeof(void *));
794 a->writer_nums = para_malloc(nw * sizeof(int));
795 a->num_writers = 0;
796 }
797 for (i = 0; i < conf.writer_given; i++) {
798 void *wconf;
799 int writer_num;
800 ret = parse_stream_command(conf.writer_arg[i], &cmd);
801 if (ret < 0)
802 goto out;
803 a = &afi[ret];
804 nw = a->num_writers;
805 wconf = check_writer_arg(cmd, &writer_num);
806 if (!wconf) {
807 ret = writer_num;
808 goto out;
809 }
810 a->writer_nums[nw] = writer_num;
811 a->writer_conf[nw] = wconf;
812 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
813 nw, writer_names[writer_num]);
814 a->num_writers++;
815 }
816 ret = 1;
817 out:
818 return ret;
819 }
820
821 static int parse_receiver_args(void)
822 {
823 int i, ret, receiver_num;
824 char *cmd = NULL;
825 struct audio_format_info *a;
826
827 for (i = conf.receiver_given - 1; i >= 0; i--) {
828 char *arg = conf.receiver_arg[i];
829 char *recv_arg = strchr(arg, ':');
830 ret = -E_MISSING_COLON;
831 if (!recv_arg)
832 goto out;
833 *recv_arg = '\0';
834 recv_arg++;
835 ret = get_audio_format_num(arg);
836 if (ret < 0)
837 goto out;
838 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
839 if (!afi[ret].receiver_conf) {
840 ret = -E_RECV_SYNTAX;
841 goto out;
842 }
843 afi[ret].receiver = &receivers[receiver_num];
844 }
845 /* use the first available receiver with no arguments
846 * for those audio formats for which no receiver
847 * was specified
848 */
849 cmd = para_strdup(receivers[0].name);
850 FOR_EACH_AUDIO_FORMAT(i) {
851 a = &afi[i];
852 if (a->receiver_conf)
853 continue;
854 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
855 if (!a->receiver_conf)
856 return -E_RECV_SYNTAX;
857 a->receiver = &receivers[receiver_num];
858 }
859 ret = 1;
860 out:
861 free(cmd);
862 return ret;
863 }
864
865 static int init_default_filters(void)
866 {
867 int i, ret = 1;
868
869 FOR_EACH_AUDIO_FORMAT(i) {
870 struct audio_format_info *a = &afi[i];
871 char *tmp;
872 int j;
873
874 if (a->num_filters)
875 continue; /* no default -- nothing to to */
876 /*
877 * If udp is used to receive this audiod format, add fecdec as
878 * the first filter.
879 */
880 if (strcmp(afi[i].receiver->name, "udp") == 0) {
881 tmp = para_strdup("fecdec");
882 add_filter(i, tmp);
883 free(tmp);
884 if (ret < 0)
885 goto out;
886 }
887 /* add "dec" to audio format name */
888 tmp = make_message("%sdec", audio_formats[i]);
889 for (j = 0; filters[j].name; j++)
890 if (!strcmp(tmp, filters[j].name))
891 break;
892 free(tmp);
893 ret = -E_UNSUPPORTED_FILTER;
894 if (!filters[j].name)
895 goto out;
896 tmp = para_strdup(filters[j].name);
897 ret = add_filter(i, tmp);
898 free(tmp);
899 if (ret < 0)
900 goto out;
901 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
902 filters[j].name);
903 }
904 out:
905 return ret;
906 }
907
908 static int parse_filter_args(void)
909 {
910 int i, ret, nf;
911
912 nf = PARA_MAX(2U, conf.filter_given);
913 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
914 FOR_EACH_AUDIO_FORMAT(i) {
915 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
916 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
917 }
918 if (!conf.no_default_filters_given)
919 return init_default_filters();
920 for (i = 0; i < conf.filter_given; i++) {
921 char *arg = conf.filter_arg[i];
922 char *filter_name = strchr(arg, ':');
923 ret = -E_MISSING_COLON;
924 if (!filter_name)
925 goto out;
926 *filter_name = '\0';
927 filter_name++;
928 ret = get_audio_format_num(arg);
929 if (ret < 0)
930 goto out;
931 ret = add_filter(ret, filter_name);
932 if (ret < 0)
933 goto out;
934 }
935 ret = init_default_filters(); /* use default values for the rest */
936 out:
937 return ret;
938 }
939
940 static int parse_stream_args(void)
941 {
942 int ret;
943
944 ret = parse_receiver_args();
945 if (ret < 0)
946 return ret;
947 ret = parse_filter_args();
948 if (ret < 0)
949 return ret;
950 ret = parse_writer_args();
951 if (ret < 0)
952 return ret;
953 return 1;
954 }
955
956 /* does not unlink socket on errors */
957 static int audiod_get_socket(void)
958 {
959 struct sockaddr_un unix_addr;
960 int ret, fd;
961
962 if (conf.socket_given)
963 socket_name = para_strdup(conf.socket_arg);
964 else {
965 char *hn = para_hostname();
966 socket_name = make_message("/var/paraslash/audiod_socket.%s",
967 hn);
968 free(hn);
969 }
970 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
971 if (conf.force_given)
972 unlink(socket_name);
973 ret = create_local_socket(socket_name, &unix_addr,
974 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
975 if (ret < 0)
976 goto err;
977 fd = ret;
978 if (listen(fd , 5) < 0) {
979 ret = -ERRNO_TO_PARA_ERROR(errno);
980 goto err;
981 }
982 ret = mark_fd_nonblocking(fd);
983 if (ret < 0)
984 goto err;
985 return fd;
986 err:
987 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
988 exit(EXIT_FAILURE);
989 }
990
991 static void signal_pre_select(struct sched *s, struct task *t)
992 {
993 struct signal_task *st = container_of(t, struct signal_task, task);
994 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
995 }
996
997 static void signal_post_select(struct sched *s, struct task *t)
998 {
999 struct signal_task *st = container_of(t, struct signal_task, task);
1000
1001 if (!FD_ISSET(st->fd, &s->rfds))
1002 return;
1003
1004 st->signum = para_next_signal();
1005 switch (st->signum) {
1006 case SIGINT:
1007 case SIGTERM:
1008 case SIGHUP:
1009 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
1010 clean_exit(EXIT_FAILURE, "caught deadly signal");
1011 }
1012 }
1013
1014 static void signal_setup_default(struct signal_task *st)
1015 {
1016 st->task.pre_select = signal_pre_select;
1017 st->task.post_select = signal_post_select;
1018 sprintf(st->task.status, "signal task");
1019 }
1020
1021 static void command_pre_select(struct sched *s, struct task *t)
1022 {
1023 struct command_task *ct = container_of(t, struct command_task, task);
1024 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1025 }
1026
1027 static void command_post_select(struct sched *s, struct task *t)
1028 {
1029 int ret;
1030 struct command_task *ct = container_of(t, struct command_task, task);
1031 static struct timeval last_status_dump;
1032 struct timeval tmp, delay = {0, 500 * 1000};
1033
1034 tv_add(&last_status_dump, &delay, &tmp);
1035 if (tv_diff(&tmp, now, NULL) < 0) {
1036 audiod_status_dump();
1037 last_status_dump = *now;
1038 }
1039
1040 if (!FD_ISSET(ct->fd, &s->rfds))
1041 return;
1042 ret = handle_connect(ct->fd);
1043 if (ret < 0)
1044 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1045 }
1046
1047 static void init_command_task(struct command_task *ct)
1048 {
1049 ct->task.pre_select = command_pre_select;
1050 ct->task.post_select = command_post_select;
1051 ct->task.error = 0;
1052 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1053 sprintf(ct->task.status, "command task");
1054 }
1055
1056 static void close_stat_pipe(void)
1057 {
1058 if (!stat_task->ct)
1059 return;
1060 btr_free_node(stat_task->ct->btrn);
1061 client_close(stat_task->ct);
1062 stat_task->ct = NULL;
1063 clear_and_dump_items();
1064 stat_task->length_seconds = 0;
1065 stat_task->offset_seconds = 0;
1066 stat_task->vss_status = 0;
1067 stat_task->current_audio_format_num = -1;
1068 audiod_status_dump();
1069 }
1070
1071 /**
1072 * close the connection to para_server and exit
1073 *
1074 * \param status the exit status which is passed to exit(3)
1075 * \param msg the log message
1076 *
1077 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1078 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1079 * EXIT_FAILURE.
1080 *
1081 * \sa exit(3)
1082 */
1083 void __noreturn clean_exit(int status, const char *msg)
1084 {
1085 PARA_EMERG_LOG("%s\n", msg);
1086 if (socket_name)
1087 unlink(socket_name);
1088 close_stat_pipe();
1089 exit(status);
1090 }
1091
1092 /* avoid busy loop if server is down */
1093 static void set_stat_task_restart_barrier(unsigned seconds)
1094 {
1095 struct timeval delay = {seconds, 0};
1096 tv_add(now, &delay, &stat_task->restart_barrier);
1097 }
1098
1099 static void try_to_close_slot(int slot_num)
1100 {
1101 struct slot_info *s = &slot[slot_num];
1102 struct audio_format_info *a = afi + s->format;
1103 int i;
1104
1105 if (s->format < 0)
1106 return;
1107 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1108 return;
1109 for (i = 0; i < a->num_filters; i++)
1110 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1111 return;
1112 if (a->num_writers > 0) {
1113 for (i = 0; i < a->num_writers; i++)
1114 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1115 return;
1116 } else {
1117 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1118 return;
1119 }
1120 PARA_INFO_LOG("closing slot %d\n", slot_num);
1121 close_writers(s);
1122 close_filters(s);
1123 close_receiver(slot_num);
1124 clear_slot(slot_num);
1125 }
1126
1127 /*
1128 * Check if any receivers/filters/writers need to be started and do so if
1129 * necessary.
1130 */
1131 static void start_stop_decoders(void)
1132 {
1133 int i, ret;
1134 struct slot_info *sl;
1135 struct audio_format_info *a;
1136
1137 FOR_EACH_SLOT(i)
1138 try_to_close_slot(i);
1139 if (audiod_status != AUDIOD_ON ||
1140 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1141 return kill_all_decoders(-E_NOT_PLAYING);
1142 if (!must_start_decoder())
1143 return;
1144 ret = open_receiver(stat_task->current_audio_format_num);
1145 if (ret < 0)
1146 return;
1147 sl = slot + ret;
1148 a = afi + sl->format;
1149 if (a->num_filters)
1150 open_filters(sl);
1151 open_writers(sl);
1152 activate_grab_clients();
1153 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1154 }
1155
1156 static void status_pre_select(struct sched *s, struct task *t)
1157 {
1158 struct status_task *st = container_of(t, struct status_task, task);
1159 int ret, cafn = stat_task->current_audio_format_num;
1160
1161 if (must_start_decoder())
1162 goto min_delay;
1163 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1164 if (ret > 0)
1165 goto min_delay;
1166 if (!st->ct)
1167 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1168 if (cafn >= 0)
1169 sched_request_barrier(&afi[cafn].restart_barrier, s);
1170 return;
1171 min_delay:
1172 sched_min_delay(s);
1173 }
1174
1175 /* restart the client task if necessary */
1176 static void status_post_select(__a_unused struct sched *s, struct task *t)
1177 {
1178 struct status_task *st = container_of(t, struct status_task, task);
1179
1180 if (audiod_status == AUDIOD_OFF) {
1181 if (!st->ct)
1182 goto out;
1183 if (st->ct->task.error >= 0) {
1184 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1185 goto out;
1186 }
1187 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1188 goto out;
1189 close_stat_pipe();
1190 st->clock_diff_count = conf.clock_diff_count_arg;
1191 goto out;
1192 }
1193 if (st->ct) {
1194 char *buf;
1195 size_t sz;
1196 int ret;
1197 if (st->ct->task.error < 0) {
1198 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1199 goto out;
1200 close_stat_pipe();
1201 goto out;
1202 }
1203 if (st->ct->status != CL_RECEIVING)
1204 goto out;
1205 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1206 if (ret <= 0)
1207 goto out;
1208 sz = btr_next_buffer(st->btrn, &buf);
1209 ret = for_each_stat_item(buf, sz, update_item);
1210 if (ret < 0) {
1211 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1212 goto out;
1213 }
1214 if (sz != ret)
1215 st->last_status_read = *now;
1216 else {
1217 struct timeval diff;
1218 tv_diff(now, &st->last_status_read, &diff);
1219 if (diff.tv_sec > 61)
1220 kill_btrn(st->ct->btrn, &st->ct->task,
1221 -E_STATUS_TIMEOUT);
1222 }
1223 btr_consume(st->btrn, sz - ret);
1224 goto out;
1225 }
1226 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1227 goto out;
1228 if (st->clock_diff_count) { /* get status only one time */
1229 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1230 int argc = 5;
1231 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1232 st->clock_diff_count--;
1233 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1234 set_stat_task_restart_barrier(2);
1235
1236 } else {
1237 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1238 int argc = 4;
1239 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1240 set_stat_task_restart_barrier(5);
1241 }
1242 free(stat_item_values[SI_BASENAME]);
1243 stat_item_values[SI_BASENAME] = para_strdup(
1244 "no connection to para_server");
1245 stat_client_write_item(SI_BASENAME);
1246 st->last_status_read = *now;
1247 out:
1248 start_stop_decoders();
1249 }
1250
1251 static void init_status_task(struct status_task *st)
1252 {
1253 memset(st, 0, sizeof(struct status_task));
1254 st->task.pre_select = status_pre_select;
1255 st->task.post_select = status_post_select;
1256 st->sa_time_diff_sign = 1;
1257 st->clock_diff_count = conf.clock_diff_count_arg;
1258 st->current_audio_format_num = -1;
1259 sprintf(st->task.status, "stat");
1260 st->btrn = btr_new_node(&(struct btr_node_description)
1261 EMBRACE(.name = "stat"));
1262 }
1263
1264 static void set_initial_status(void)
1265 {
1266 audiod_status = AUDIOD_ON;
1267 if (!conf.mode_given)
1268 return;
1269 if (!strcmp(conf.mode_arg, "sb")) {
1270 audiod_status = AUDIOD_STANDBY;
1271 return;
1272 }
1273 if (!strcmp(conf.mode_arg, "off")) {
1274 audiod_status = AUDIOD_OFF;
1275 return;
1276 }
1277 if (strcmp(conf.mode_arg, "on"))
1278 PARA_WARNING_LOG("invalid mode\n");
1279 }
1280
1281 __noreturn static void print_help_and_die(void)
1282 {
1283 int d = conf.detailed_help_given;
1284 const char **p = d? audiod_args_info_detailed_help
1285 : audiod_args_info_help;
1286
1287 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1288 AUDIOD_CMDLINE_PARSER_VERSION);
1289 printf_or_die("%s\n\n", audiod_args_info_usage);
1290 for (; *p; p++)
1291 printf_or_die("%s\n", *p);
1292 print_receiver_helps(d);
1293 print_filter_helps(d);
1294 print_writer_helps(d);
1295 exit(0);
1296 }
1297
1298 static void init_colors_or_die(void)
1299 {
1300 int ret, i;
1301
1302 if (!want_colors())
1303 return;
1304 daemon_set_default_log_colors();
1305 daemon_set_flag(DF_COLOR_LOG);
1306 for (i = 0; i < conf.log_color_given; i++) {
1307 ret = daemon_set_log_color(conf.log_color_arg[i]);
1308 if (ret < 0)
1309 exit(EXIT_FAILURE);
1310 }
1311 }
1312
1313 /**
1314 * the main function of para_audiod
1315 *
1316 * \param argc usual argument count
1317 * \param argv usual argument vector
1318 *
1319 * \return EXIT_SUCCESS or EXIT_FAILURE
1320 *
1321 * \sa para_audiod(1)
1322 * */
1323 int main(int argc, char *argv[])
1324 {
1325 int ret, i;
1326 static struct sched s;
1327 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1328 struct audiod_cmdline_parser_params params = {
1329 .override = 0,
1330 .initialize = 1,
1331 .check_required = 0,
1332 .check_ambiguity = 0,
1333 .print_errors = 1
1334 };
1335
1336 valid_fd_012();
1337 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1338 exit(EXIT_FAILURE);
1339 HANDLE_VERSION_FLAG("audiod", conf);
1340 /* init receivers/filters/writers early to make help work */
1341 recv_init();
1342 filter_init();
1343 writer_init();
1344 if (conf.help_given || conf.detailed_help_given)
1345 print_help_and_die();
1346 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1347 parse_config_or_die();
1348 init_colors_or_die();
1349 init_random_seed_or_die();
1350 daemon_set_flag(DF_LOG_TIME);
1351 daemon_set_flag(DF_LOG_HOSTNAME);
1352 daemon_set_flag(DF_LOG_LL);
1353 if (conf.log_timing_given)
1354 daemon_set_flag(DF_LOG_TIMING);
1355 if (conf.logfile_given) {
1356 daemon_set_logfile(conf.logfile_arg);
1357 daemon_open_log_or_die();
1358 }
1359 ret = parse_stream_args();
1360 if (ret < 0) {
1361 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1362 exit(EXIT_FAILURE);
1363 }
1364 log_welcome("para_audiod");
1365 server_uptime(UPTIME_SET);
1366 set_initial_status();
1367 FOR_EACH_SLOT(i)
1368 clear_slot(i);
1369 setup_signal_handling();
1370 signal_setup_default(sig_task);
1371
1372 init_status_task(stat_task);
1373 init_command_task(cmd_task);
1374
1375 if (conf.daemon_given)
1376 daemonize();
1377
1378 register_task(&sig_task->task);
1379 register_task(&cmd_task->task);
1380 register_task(&stat_task->task);
1381 s.default_timeout.tv_sec = 2;
1382 s.default_timeout.tv_usec = 999 * 1000;
1383 ret = schedule(&s);
1384
1385 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1386 return EXIT_FAILURE;
1387 }