7085ef0f4da3e303df923c4ea6dd1b705911968d
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2011 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c the paraslash's audio daemon */
8 #include <regex.h>
9 #include <sys/types.h>
10 #include <signal.h>
11 #include <stdbool.h>
12
13 #include "para.h"
14 #include "error.h"
15 #include "crypt.h"
16 #include "audiod.cmdline.h"
17 #include "list.h"
18 #include "sched.h"
19 #include "ggo.h"
20 #include "recv.h"
21 #include "buffer_tree.h"
22 #include "filter.h"
23 #include "grab_client.h"
24 #include "client.cmdline.h"
25 #include "client.h"
26 #include "audiod.h"
27 #include "net.h"
28 #include "daemon.h"
29 #include "string.h"
30 #include "fd.h"
31 #include "write.h"
32 #include "write_common.h"
33 #include "signal.h"
34 #include "version.h"
35
36 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
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 size_t min_iqs;
96 /** The offset value announced by para_server. */
97 int offset_seconds;
98 /** The length of the current audio file as announced by para_server. */
99 int length_seconds;
100 /** The start of the current stream from the view of para_server. */
101 struct timeval server_stream_start;
102 /** The average time deviation between para_server and para_audiod. */
103 struct timeval sa_time_diff;
104 /** Whether client time is ahead of server time. */
105 int sa_time_diff_sign;
106 /** The 'P' and the 'N' flags as announced by para_server. */
107 enum vss_status_flags vss_status;
108 /** Number of times the clock difference is to be checked. */
109 unsigned clock_diff_count;
110 /** When to start the next check for clock difference. */
111 struct timeval clock_diff_barrier;
112 /** Number of the audio format as announced by para_server. */
113 int current_audio_format_num;
114 /* The status task btrn is the child of the client task. */
115 struct btr_node *btrn;
116 };
117
118 /** The array of status items sent by para_server. */
119 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
120
121 /**
122 * the current mode of operation of which can be changed by the on/off/cycle
123 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
124 */
125 int audiod_status = AUDIOD_ON;
126
127 /**
128 * the gengetopt args_info struct that holds information on all command line
129 * arguments
130 */
131 struct audiod_args_info conf;
132
133 static char *socket_name;
134 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
135
136 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
137
138 static struct status_task status_task_struct;
139
140 /**
141 * the task that calls the status command of para_server
142 *
143 * \sa struct status_task
144 */
145 static struct status_task *stat_task = &status_task_struct;
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 static 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 static int get_matching_audio_format_nums(const char *re)
183 {
184 int i, ret;
185 regex_t preg;
186
187 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
188 if (ret < 0)
189 return ret;
190 ret = 0;
191 FOR_EACH_AUDIO_FORMAT(i)
192 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
193 ret |= (1 << i);
194 regfree(&preg);
195 return ret;
196 }
197
198 /**
199 * Compute the play time based on information of the given slot.
200 *
201 * \param slot_num The slot number (negative means: no slot).
202 *
203 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
204 * from the status items received from para_server and the start time of the
205 * (first) writer of the given slot.
206 *
207 * It has to to take into account that probably the stream was not started at
208 * the beginning of the file, that the clock between the server and the client
209 * host may differ and that playback of the stream was delayed, e.g. because
210 * the prebuffer filter is used in the filter configuration of the given slot.
211 *
212 * If no writer is active in the given slot, or \a slot_num is negative
213 * (indicating that para_audiod runs in standby mode), an approximation based
214 * only on the status items is computed and the returned string is prefixed
215 * with "~".
216 *
217 * \return A string that must be freed by the caller.
218 */
219 char *get_time_string(int slot_num)
220 {
221 int ret, seconds = 0, length;
222 struct timeval *tmp, sum, sss, /* server stream start */
223 rstime, /* receiver start time */
224 wstime, /* writer start time */
225 wtime, /* now - writer start */
226 rskip; /* receiver start - sss */
227 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
228 char *msg;
229
230 if (audiod_status == AUDIOD_OFF)
231 goto empty;
232 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
233 if (stat_task->length_seconds) /* paused */
234 return NULL;
235 goto empty; /* stopped */
236 }
237 if (audiod_status == AUDIOD_ON && !s)
238 goto empty;
239 /*
240 * Valid status items and playing, set length and tmp to the stream
241 * start. We use the slot info and fall back to the info from current
242 * status items if no slot info is available.
243 */
244 length = stat_task->length_seconds;
245 tmp = &stat_task->server_stream_start;
246 if (s && s->wns) { /* writer active in this slot */
247 btr_get_node_start(s->wns[0].btrn, &wstime);
248 if (wstime.tv_sec != 0) { /* writer wrote something */
249 if (s->server_stream_start.tv_sec == 0) {
250 /* copy status info to slot */
251 s->server_stream_start = stat_task->server_stream_start;
252 s->offset_seconds = stat_task->offset_seconds;
253 s->seconds_total = stat_task->length_seconds;
254 }
255 length = s->seconds_total;
256 tmp = &s->server_stream_start;
257 }
258 }
259 if (stat_task->sa_time_diff_sign > 0)
260 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
261 else
262 tv_add(tmp, &stat_task->sa_time_diff, &sss);
263 if (!s || !s->wns) {
264 struct timeval diff;
265 tv_diff(now, &sss, &diff);
266 seconds = diff.tv_sec + stat_task->offset_seconds;
267 goto out;
268 }
269 tv_diff(now, &wstime, &wtime);
270 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
271 seconds = s->offset_seconds;
272 btr_get_node_start(s->receiver_node->btrn, &rstime);
273 ret = tv_diff(&rstime, &sss, &rskip);
274 if (ret > 0) { /* audiod was started in the middle of the stream */
275 tv_add(&wtime, &rskip, &sum);
276 seconds += sum.tv_sec;
277 } else
278 seconds += wtime.tv_sec;
279 out:
280 seconds = PARA_MIN(seconds, length);
281 seconds = PARA_MAX(seconds, 0);
282 msg = make_message(
283 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
284 s? "" : "~",
285 seconds / 60,
286 seconds % 60,
287 (length - seconds) / 60,
288 (length - seconds) % 60,
289 length? (seconds * 100 + length / 2) / length : 0,
290 length / 60,
291 length % 60
292 );
293 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
294 return msg;
295 empty:
296 return para_strdup(NULL);
297 }
298
299 static int want_colors(void)
300 {
301 if (conf.color_arg == color_arg_no)
302 return 0;
303 if (conf.color_arg == color_arg_yes)
304 return 1;
305 if (conf.logfile_given)
306 return 0;
307 return isatty(STDERR_FILENO);
308 }
309
310 static void parse_config_or_die(void)
311 {
312 int ret;
313 char *config_file;
314 struct audiod_cmdline_parser_params params = {
315 .override = 0,
316 .initialize = 0,
317 .check_required = 1,
318 .check_ambiguity = 0,
319 .print_errors = 1
320 };
321
322 if (conf.config_file_given)
323 config_file = para_strdup(conf.config_file_arg);
324 else {
325 char *home = para_homedir();
326 config_file = make_message("%s/.paraslash/audiod.conf", home);
327 free(home);
328 }
329 ret = file_exists(config_file);
330 if (conf.config_file_given && !ret) {
331 PARA_EMERG_LOG("can not read config file %s\n", config_file);
332 goto err;
333 }
334 if (ret)
335 audiod_cmdline_parser_config_file(config_file, &conf, &params);
336 free(config_file);
337 daemon_set_loglevel(conf.loglevel_arg);
338 return;
339 err:
340 free(config_file);
341 exit(EXIT_FAILURE);
342 }
343
344 static void setup_signal_handling(void)
345 {
346 sig_task->fd = para_signal_init();
347 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
348 para_install_sighandler(SIGINT);
349 para_install_sighandler(SIGTERM);
350 para_install_sighandler(SIGHUP);
351 para_sigaction(SIGPIPE, SIG_IGN);
352 }
353
354 static void clear_slot(int slot_num)
355 {
356 struct slot_info *s = &slot[slot_num];
357
358 PARA_INFO_LOG("clearing slot %d\n", slot_num);
359 memset(s, 0, sizeof(struct slot_info));
360 s->format = -1;
361 }
362
363 static void close_receiver(int slot_num)
364 {
365 struct slot_info *s = &slot[slot_num];
366 struct audio_format_info *a;
367
368 if (s->format < 0 || !s->receiver_node)
369 return;
370 a = &afi[s->format];
371 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
372 audio_formats[s->format], slot_num);
373 a->receiver->close(s->receiver_node);
374 btr_free_node(s->receiver_node->btrn);
375 free(s->receiver_node);
376 s->receiver_node = NULL;
377 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
378 &a->restart_barrier);
379 }
380
381 static void writer_cleanup(struct writer_node *wn)
382 {
383 struct writer *w;
384
385 if (!wn)
386 return;
387 w = writers + wn->writer_num;
388 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
389 w->close(wn);
390 btr_free_node(wn->btrn);
391 }
392
393 static void close_writers(struct slot_info *s)
394 {
395 struct audio_format_info *a;
396 int i;
397
398 if (s->format < 0)
399 return;
400 assert(s->wns);
401 a = afi + s->format;
402 if (a->num_writers == 0)
403 writer_cleanup(s->wns);
404 else {
405 for (i = 0; i < a->num_writers; i++)
406 writer_cleanup(s->wns + i);
407 }
408 free(s->wns);
409 s->wns = NULL;
410 }
411
412 static void close_filters(struct slot_info *s)
413 {
414 int i;
415 struct audio_format_info *a = afi + s->format;
416 if (a->num_filters == 0)
417 return;
418 for (i = 0; i < a->num_filters; i++) {
419 struct filter_node *fn = s->fns + i;
420 struct filter *f;
421
422 if (!fn)
423 continue;
424 f = filters + fn->filter_num;
425 if (f->close)
426 f->close(fn);
427 btr_free_node(fn->btrn);
428 }
429 free(s->fns);
430 s->fns = NULL;
431 }
432
433 /*
434 * Whenever a task commits suicide by returning from post_select with t->error
435 * < 0, it also removes its btr node. We do exactly that to kill a running
436 * task. Note that the scheduler checks t->error also _before_ each pre/post
437 * select call, so the victim will never be scheduled again.
438 */
439 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
440 {
441 if (t->error < 0)
442 return;
443 t->error = error;
444 btr_remove_node(btrn);
445 }
446
447 static void kill_all_decoders(int error)
448 {
449 int i;
450
451 FOR_EACH_SLOT(i) {
452 struct slot_info *s = slot + i;
453 if (s->format < 0)
454 continue;
455 if (!s->receiver_node)
456 continue;
457 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
458 error);
459 }
460 }
461
462 static int get_empty_slot(void)
463 {
464 int i;
465 struct slot_info *s;
466
467 FOR_EACH_SLOT(i) {
468 s = &slot[i];
469 if (s->format < 0) {
470 clear_slot(i);
471 return i;
472 }
473 if (s->wns || s->receiver_node || s->fns)
474 continue;
475 clear_slot(i);
476 return i;
477 }
478 return -E_NO_MORE_SLOTS;
479 }
480
481 static void open_filters(struct slot_info *s)
482 {
483 struct audio_format_info *a = afi + s->format;
484 struct filter_node *fn;
485 int nf = a->num_filters;
486 struct btr_node *parent;
487 int i;
488
489 if (nf == 0)
490 return;
491 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
492 assert(s->fns == NULL);
493 s->fns = para_calloc(nf * sizeof(struct filter_node));
494 parent = s->receiver_node->btrn;
495 for (i = 0; i < nf; i++) {
496 struct filter *f = filters + a->filter_nums[i];
497 fn = s->fns + i;
498 fn->filter_num = a->filter_nums[i];
499 fn->conf = a->filter_conf[i];
500 fn->task.pre_select = f->pre_select;
501 fn->task.post_select = f->post_select;
502
503 fn->btrn = btr_new_node(&(struct btr_node_description)
504 EMBRACE(.name = f->name, .parent = parent,
505 .handler = f->execute, .context = fn));
506
507 f->open(fn);
508 register_task(&fn->task);
509 parent = fn->btrn;
510 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
511 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
512 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
513 }
514 }
515
516 static void open_writers(struct slot_info *s)
517 {
518 int i;
519 struct audio_format_info *a = afi + s->format;
520 struct writer_node *wn;
521 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
522
523 assert(s->wns == NULL);
524 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
525 * sizeof(struct writer_node));
526 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
527 for (i = 0; i < a->num_writers; i++) {
528 wn = s->wns + i;
529 wn->conf = a->writer_conf[i];
530 wn->writer_num = a->writer_nums[i];
531 register_writer_node(wn, parent);
532 }
533 }
534
535 /* returns slot num on success */
536 static int open_receiver(int format)
537 {
538 struct audio_format_info *a = &afi[format];
539 struct slot_info *s;
540 int ret, slot_num;
541 struct receiver *r = a->receiver;
542 struct receiver_node *rn;
543
544 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
545 ret = get_empty_slot();
546 if (ret < 0)
547 return ret;
548 slot_num = ret;
549 rn = para_calloc(sizeof(*rn));
550 rn->receiver = r;
551 rn->conf = a->receiver_conf;
552 rn->btrn = btr_new_node(&(struct btr_node_description)
553 EMBRACE(.name = r->name, .context = rn));
554 ret = r->open(rn);
555 if (ret < 0) {
556 btr_free_node(rn->btrn);
557 free(rn);
558 return ret;
559 }
560 s = &slot[slot_num];
561 s->format = format;
562 s->receiver_node = rn;
563 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
564 audio_formats[format], r->name, slot_num);
565 rn->task.pre_select = r->pre_select;
566 rn->task.post_select = r->post_select;
567 sprintf(rn->task.status, "%s receiver node", r->name);
568 register_task(&rn->task);
569 return slot_num;
570 }
571
572 static bool receiver_running(void)
573 {
574 int i;
575 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
576
577 FOR_EACH_SLOT(i) {
578 struct slot_info *s = &slot[i];
579 long unsigned ss2 = s->server_stream_start.tv_sec;
580
581 if (!s->receiver_node)
582 continue;
583 if (s->receiver_node->task.error >= 0)
584 return true;
585 if (ss1 == ss2)
586 return true;
587 }
588 return false;
589 }
590
591 /**
592 * Return the root node of the current buffer tree.
593 *
594 * This is only used for stream grabbing.
595 *
596 * \return \p NULL if no slot is currently active. If more than one buffer tree
597 * exists, the node corresponding to the most recently started receiver is
598 * returned.
599 */
600 struct btr_node *audiod_get_btr_root(void)
601 {
602 int i, newest_slot = -1;
603 struct timeval newest_rstime = {0, 0};
604
605 FOR_EACH_SLOT(i) {
606 struct slot_info *s = &slot[i];
607 struct timeval rstime;
608 if (!s->receiver_node)
609 continue;
610 if (s->receiver_node->task.error < 0)
611 continue;
612 btr_get_node_start(s->receiver_node->btrn, &rstime);
613 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
614 continue;
615 newest_rstime = rstime;
616 newest_slot = i;
617 }
618 if (newest_slot == -1)
619 return NULL;
620 return slot[newest_slot].receiver_node->btrn;
621 }
622
623 /* whether a new instance of a decoder should be started. */
624 static bool must_start_decoder(void)
625 {
626 int cafn = stat_task->current_audio_format_num;
627 unsigned vs = stat_task->vss_status;
628
629 if (audiod_status != AUDIOD_ON)
630 return false;
631 if (cafn < 0)
632 return false;
633 if (!stat_task->ct)
634 return false;
635 if (vs & VSS_STATUS_FLAG_NEXT)
636 return false;
637 if (!(vs & VSS_STATUS_FLAG_PLAYING))
638 return false;
639 if (receiver_running())
640 return false;
641 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
642 return false;
643 return true;
644 }
645
646 static unsigned compute_time_diff(const struct timeval *status_time)
647 {
648 struct timeval tmp, diff;
649 static unsigned count;
650 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
651 const struct timeval max_deviation = {0, 500 * 1000};
652 const int time_smooth = 5;
653
654 if (!status_time)
655 return count;
656 sign = tv_diff(status_time, now, &diff);
657 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
658 // sign, sa_time_diff_sign);
659 if (!count) {
660 sa_time_diff_sign = sign;
661 stat_task->sa_time_diff = diff;
662 count++;
663 goto out;
664 }
665 if (count > 5) {
666 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
667 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
668 PARA_WARNING_LOG("time diff jump: %lims\n",
669 s * tv2ms(&tmp));
670 }
671 count++;
672 sa_time_diff_sign = tv_convex_combination(
673 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
674 count > 10? sign : sign * time_smooth, &diff,
675 &tmp);
676 stat_task->sa_time_diff = tmp;
677 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
678 sign < 0? "-" : "+",
679 tv2ms(&diff),
680 sa_time_diff_sign < 0? "-" : "+",
681 tv2ms(&stat_task->sa_time_diff)
682 );
683 out:
684 stat_task->sa_time_diff_sign = sa_time_diff_sign;
685 return count;
686 }
687
688 static int update_item(int itemnum, char *buf)
689 {
690 long unsigned sec, usec;
691
692 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
693 return 1;
694 free(stat_item_values[itemnum]);
695 stat_item_values[itemnum] = para_strdup(buf);
696 stat_client_write_item(itemnum);
697 switch (itemnum) {
698 case SI_STATUS_FLAGS:
699 stat_task->vss_status = 0;
700 if (strchr(buf, 'N'))
701 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
702 if (strchr(buf, 'P'))
703 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
704 break;
705 case SI_OFFSET:
706 stat_task->offset_seconds = atoi(buf);
707 break;
708 case SI_SECONDS_TOTAL:
709 stat_task->length_seconds = atoi(buf);
710 break;
711 case SI_STREAM_START:
712 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
713 stat_task->server_stream_start.tv_sec = sec;
714 stat_task->server_stream_start.tv_usec = usec;
715 }
716 break;
717 case SI_CURRENT_TIME:
718 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
719 struct timeval tv = {sec, usec};
720 compute_time_diff(&tv);
721 }
722 break;
723 case SI_FORMAT:
724 stat_task->current_audio_format_num
725 = get_audio_format_num(buf);
726 }
727 return 1;
728 }
729
730 static int parse_stream_command(const char *txt, char **cmd)
731 {
732 int ret, len;
733 char *re, *p = strchr(txt, ':');
734
735 if (!p)
736 return -E_MISSING_COLON;
737 *cmd = p + 1;
738 len = p - txt;
739 re = malloc(len + 1);
740 strncpy(re, txt, len);
741 re[len] = '\0';
742 ret = get_matching_audio_format_nums(re);
743 free(re);
744 return ret;
745 }
746
747 static int add_filter(int format, char *cmdline)
748 {
749 struct audio_format_info *a = &afi[format];
750 int filter_num, nf = a->num_filters;
751 void *cfg;
752
753 filter_num = check_filter_arg(cmdline, &cfg);
754 if (filter_num < 0)
755 return filter_num;
756 a->filter_conf = para_realloc(a->filter_conf,
757 (nf + 1) * sizeof(void *));
758 a->filter_nums = para_realloc(a->filter_nums,
759 (nf + 1) * sizeof(unsigned));
760 a->filter_nums[nf] = filter_num;
761 a->filter_conf[nf] = cfg;
762 a->num_filters++;
763 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
764 filters[filter_num].name);
765 return filter_num;
766 }
767
768 static int parse_writer_args(void)
769 {
770 int i, ret;
771 char *cmd;
772 struct audio_format_info *a;
773
774 for (i = 0; i < conf.writer_given; i++) {
775 void *wconf;
776 int j, nw, writer_num, af_mask;
777
778 ret = parse_stream_command(conf.writer_arg[i], &cmd);
779 if (ret < 0)
780 return ret;
781 af_mask = ret;
782 FOR_EACH_AUDIO_FORMAT(j) {
783 a = afi + j;
784 if ((af_mask & (1 << j)) == 0) /* no match */
785 continue;
786 wconf = check_writer_arg_or_die(cmd, &writer_num);
787 nw = a->num_writers;
788 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
789 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
790 a->writer_nums[nw] = writer_num;
791 a->writer_conf[nw] = wconf;
792 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
793 nw, writer_names[writer_num]);
794 a->num_writers++;
795 }
796 }
797 /* Use default writer for audio formats which are not yet set up. */
798 FOR_EACH_AUDIO_FORMAT(i) {
799 struct writer *w = writers + DEFAULT_WRITER;
800 a = afi + i;
801 if (a->num_writers > 0)
802 continue; /* already set up */
803 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
804 writer_names[DEFAULT_WRITER]);
805 a->writer_nums = para_malloc(sizeof(int));
806 a->writer_nums[0] = DEFAULT_WRITER;
807 a->writer_conf = para_malloc(sizeof(void *));
808 a->writer_conf[0] = w->parse_config_or_die("");
809 a->num_writers = 1;
810 }
811 return 1;
812 }
813
814 static int parse_receiver_args(void)
815 {
816 int i, ret, receiver_num;
817 char *cmd = NULL;
818 struct audio_format_info *a;
819
820 for (i = conf.receiver_given - 1; i >= 0; i--) {
821 char *arg;
822 int j, af_mask;
823
824 ret = parse_stream_command(conf.receiver_arg[i], &arg);
825 if (ret < 0)
826 goto out;
827 af_mask = ret;
828 FOR_EACH_AUDIO_FORMAT(j) {
829 a = afi + j;
830 if ((af_mask & (1 << j)) == 0) /* no match */
831 continue;
832 /*
833 * If multiple receivers are given for this audio format, the
834 * last one wins and we have to free the previous receiver
835 * config here. Since we are iterating backwards, the winning
836 * receiver arg is in fact the first one given.
837 */
838 if (a->receiver_conf)
839 a->receiver->free_config(a->receiver_conf);
840 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
841 ret = -E_RECV_SYNTAX;
842 if (!a->receiver_conf)
843 goto out;
844 a->receiver = receivers + receiver_num;
845 }
846 }
847 /*
848 * Use the first available receiver with no arguments for those audio
849 * formats for which no receiver was specified.
850 */
851 cmd = para_strdup(receivers[0].name);
852 FOR_EACH_AUDIO_FORMAT(i) {
853 a = &afi[i];
854 if (a->receiver_conf)
855 continue;
856 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
857 if (!a->receiver_conf)
858 return -E_RECV_SYNTAX;
859 a->receiver = &receivers[receiver_num];
860 }
861 FOR_EACH_AUDIO_FORMAT(i) {
862 a = afi + i;
863 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
864 audio_formats[i], a->receiver->name);
865 }
866 ret = 1;
867 out:
868 free(cmd);
869 return ret;
870 }
871
872 static int init_default_filters(void)
873 {
874 int i, ret = 1;
875
876 FOR_EACH_AUDIO_FORMAT(i) {
877 struct audio_format_info *a = &afi[i];
878 char *tmp;
879 int j;
880
881 if (a->num_filters)
882 continue; /* no default -- nothing to to */
883 /*
884 * udp and dccp streams are fec-encoded, so add fecdec as the
885 * first filter.
886 */
887 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
888 strcmp(afi[i].receiver->name, "dccp") == 0) {
889 tmp = para_strdup("fecdec");
890 add_filter(i, tmp);
891 free(tmp);
892 if (ret < 0)
893 goto out;
894 }
895 /* add "dec" to audio format name */
896 tmp = make_message("%sdec", audio_formats[i]);
897 for (j = 0; filters[j].name; j++)
898 if (!strcmp(tmp, filters[j].name))
899 break;
900 free(tmp);
901 ret = -E_UNSUPPORTED_FILTER;
902 if (!filters[j].name)
903 goto out;
904 tmp = para_strdup(filters[j].name);
905 ret = add_filter(i, tmp);
906 free(tmp);
907 if (ret < 0)
908 goto out;
909 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
910 filters[j].name);
911 }
912 out:
913 return ret;
914 }
915
916 static int parse_filter_args(void)
917 {
918 int i, j, ret, af_mask;
919
920 if (!conf.no_default_filters_given)
921 return init_default_filters();
922 for (i = 0; i < conf.filter_given; i++) {
923 char *arg;
924 ret = parse_stream_command(conf.filter_arg[i], &arg);
925 if (ret < 0)
926 goto out;
927 af_mask = ret;
928 FOR_EACH_AUDIO_FORMAT(j) {
929 if ((af_mask & (1 << j)) == 0) /* no match */
930 continue;
931 ret = add_filter(j, arg);
932 if (ret < 0)
933 goto out;
934 }
935 }
936 ret = init_default_filters(); /* use default values for the rest */
937 out:
938 return ret;
939 }
940
941 static int parse_stream_args(void)
942 {
943 int ret;
944
945 ret = parse_receiver_args();
946 if (ret < 0)
947 return ret;
948 ret = parse_filter_args();
949 if (ret < 0)
950 return ret;
951 ret = parse_writer_args();
952 if (ret < 0)
953 return ret;
954 return 1;
955 }
956
957 /* does not unlink socket on errors */
958 static int audiod_get_socket(void)
959 {
960 struct sockaddr_un unix_addr;
961 int ret, fd;
962
963 if (conf.socket_given)
964 socket_name = para_strdup(conf.socket_arg);
965 else {
966 char *hn = para_hostname();
967 socket_name = make_message("/var/paraslash/audiod_socket.%s",
968 hn);
969 free(hn);
970 }
971 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
972 if (conf.force_given)
973 unlink(socket_name);
974 ret = create_local_socket(socket_name, &unix_addr,
975 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
976 if (ret < 0)
977 goto err;
978 fd = ret;
979 if (listen(fd , 5) < 0) {
980 ret = -ERRNO_TO_PARA_ERROR(errno);
981 goto err;
982 }
983 ret = mark_fd_nonblocking(fd);
984 if (ret < 0)
985 goto err;
986 return fd;
987 err:
988 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
989 exit(EXIT_FAILURE);
990 }
991
992 static void signal_pre_select(struct sched *s, struct task *t)
993 {
994 struct signal_task *st = container_of(t, struct signal_task, task);
995 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
996 }
997
998 static void signal_post_select(struct sched *s, __a_unused struct task *t)
999 {
1000 int signum;
1001
1002 signum = para_next_signal(&s->rfds);
1003 switch (signum) {
1004 case SIGINT:
1005 case SIGTERM:
1006 case SIGHUP:
1007 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1008 clean_exit(EXIT_FAILURE, "caught deadly signal");
1009 }
1010 }
1011
1012 static void signal_setup_default(struct signal_task *st)
1013 {
1014 st->task.pre_select = signal_pre_select;
1015 st->task.post_select = signal_post_select;
1016 sprintf(st->task.status, "signal task");
1017 }
1018
1019 static void command_pre_select(struct sched *s, struct task *t)
1020 {
1021 struct command_task *ct = container_of(t, struct command_task, task);
1022 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1023 }
1024
1025 static void command_post_select(struct sched *s, struct task *t)
1026 {
1027 int ret;
1028 struct command_task *ct = container_of(t, struct command_task, task);
1029 static struct timeval last_status_dump;
1030 struct timeval tmp, delay = {0, 500 * 1000};
1031
1032 tv_add(&last_status_dump, &delay, &tmp);
1033 if (tv_diff(&tmp, now, NULL) < 0) {
1034 audiod_status_dump();
1035 last_status_dump = *now;
1036 }
1037
1038 ret = handle_connect(ct->fd, &s->rfds);
1039 if (ret < 0)
1040 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1041 audiod_status_dump();
1042 }
1043
1044 static void init_command_task(struct command_task *ct)
1045 {
1046 ct->task.pre_select = command_pre_select;
1047 ct->task.post_select = command_post_select;
1048 ct->task.error = 0;
1049 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1050 sprintf(ct->task.status, "command task");
1051 }
1052
1053 static void close_stat_pipe(void)
1054 {
1055 if (!stat_task->ct)
1056 return;
1057 client_close(stat_task->ct);
1058 stat_task->ct = NULL;
1059 clear_and_dump_items();
1060 stat_task->length_seconds = 0;
1061 stat_task->offset_seconds = 0;
1062 stat_task->vss_status = 0;
1063 stat_task->current_audio_format_num = -1;
1064 audiod_status_dump();
1065 }
1066
1067 /**
1068 * close the connection to para_server and exit
1069 *
1070 * \param status the exit status which is passed to exit(3)
1071 * \param msg the log message
1072 *
1073 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1074 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1075 * EXIT_FAILURE.
1076 *
1077 * \sa exit(3)
1078 */
1079 void __noreturn clean_exit(int status, const char *msg)
1080 {
1081 PARA_EMERG_LOG("%s\n", msg);
1082 if (socket_name)
1083 unlink(socket_name);
1084 close_stat_pipe();
1085 exit(status);
1086 }
1087
1088 /* avoid busy loop if server is down */
1089 static void set_stat_task_restart_barrier(unsigned seconds)
1090 {
1091 struct timeval delay = {seconds, 0};
1092 tv_add(now, &delay, &stat_task->restart_barrier);
1093 }
1094
1095 static void try_to_close_slot(int slot_num)
1096 {
1097 struct slot_info *s = &slot[slot_num];
1098 struct audio_format_info *a = afi + s->format;
1099 int i;
1100
1101 if (s->format < 0)
1102 return;
1103 if (s->receiver_node && s->receiver_node->task.error >= 0)
1104 return;
1105 for (i = 0; i < a->num_filters; i++)
1106 if (s->fns && s->fns[i].task.error >= 0)
1107 return;
1108 if (a->num_writers > 0) {
1109 for (i = 0; i < a->num_writers; i++)
1110 if (s->wns && s->wns[i].task.error >= 0)
1111 return;
1112 } else {
1113 if (s->wns && s->wns[0].task.error >= 0)
1114 return;
1115 }
1116 PARA_INFO_LOG("closing slot %d\n", slot_num);
1117 close_writers(s);
1118 close_filters(s);
1119 close_receiver(slot_num);
1120 clear_slot(slot_num);
1121 }
1122
1123 /*
1124 * Check if any receivers/filters/writers need to be started and do so if
1125 * necessary.
1126 */
1127 static void start_stop_decoders(void)
1128 {
1129 int i, ret;
1130 struct slot_info *sl;
1131 struct audio_format_info *a;
1132
1133 FOR_EACH_SLOT(i)
1134 try_to_close_slot(i);
1135 if (audiod_status != AUDIOD_ON ||
1136 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1137 return kill_all_decoders(-E_NOT_PLAYING);
1138 if (!must_start_decoder())
1139 return;
1140 ret = open_receiver(stat_task->current_audio_format_num);
1141 if (ret < 0) {
1142 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1143 return;
1144 }
1145 sl = slot + ret;
1146 a = afi + sl->format;
1147 if (a->num_filters)
1148 open_filters(sl);
1149 open_writers(sl);
1150 activate_grab_clients();
1151 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1152 }
1153
1154 static void status_pre_select(struct sched *s, struct task *t)
1155 {
1156 struct status_task *st = container_of(t, struct status_task, task);
1157 int ret, cafn = stat_task->current_audio_format_num;
1158
1159 if (must_start_decoder())
1160 goto min_delay;
1161 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1162 if (ret > 0)
1163 goto min_delay;
1164 if (st->ct && audiod_status == AUDIOD_OFF)
1165 goto min_delay;
1166 if (!st->ct && audiod_status != AUDIOD_OFF)
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 /*
1171 * If para_server is playing we'd like to have a smooth time display
1172 * even if we are running in standby mode. So we request a timeout that
1173 * expires at the next full second.
1174 */
1175 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1176 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1177 return;
1178 min_delay:
1179 sched_min_delay(s);
1180 }
1181
1182 /* restart the client task if necessary */
1183 static void status_post_select(__a_unused struct sched *s, struct task *t)
1184 {
1185 struct status_task *st = container_of(t, struct status_task, task);
1186
1187 if (audiod_status == AUDIOD_OFF) {
1188 if (!st->ct)
1189 goto out;
1190 if (st->ct->task.error >= 0) {
1191 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1192 goto out;
1193 }
1194 if (st->ct->task.error >= 0)
1195 goto out;
1196 close_stat_pipe();
1197 st->clock_diff_count = conf.clock_diff_count_arg;
1198 goto out;
1199 }
1200 if (st->ct) {
1201 char *buf;
1202 size_t sz;
1203 int ret;
1204 if (st->ct->task.error < 0) {
1205 if (st->ct->task.error >= 0)
1206 goto out;
1207 close_stat_pipe();
1208 goto out;
1209 }
1210 if (st->ct->status != CL_RECEIVING)
1211 goto out;
1212 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1213 if (ret <= 0) {
1214 struct timeval diff;
1215 tv_diff(now, &st->last_status_read, &diff);
1216 if (diff.tv_sec > 61)
1217 kill_btrn(st->ct->btrn, &st->ct->task,
1218 -E_STATUS_TIMEOUT);
1219 goto out;
1220 }
1221 btr_merge(st->btrn, st->min_iqs);
1222 sz = btr_next_buffer(st->btrn, &buf);
1223 ret = for_each_stat_item(buf, sz, update_item);
1224 if (ret < 0) {
1225 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1226 goto out;
1227 }
1228 if (sz != ret) {
1229 btr_consume(st->btrn, sz - ret);
1230 st->last_status_read = *now;
1231 st->min_iqs = 0;
1232 } else /* current status item crosses buffers */
1233 st->min_iqs = sz + 1;
1234 goto out;
1235 }
1236 btr_drain(st->btrn);
1237 st->current_audio_format_num = -1;
1238 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1239 goto out;
1240 if (st->clock_diff_count) { /* get status only one time */
1241 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1242 int argc = 5;
1243 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1244 st->clock_diff_count--;
1245 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1246 set_stat_task_restart_barrier(2);
1247
1248 } else {
1249 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1250 int argc = 4;
1251 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1252 set_stat_task_restart_barrier(5);
1253 }
1254 free(stat_item_values[SI_BASENAME]);
1255 stat_item_values[SI_BASENAME] = para_strdup(
1256 "no connection to para_server");
1257 stat_client_write_item(SI_BASENAME);
1258 st->last_status_read = *now;
1259 out:
1260 start_stop_decoders();
1261 }
1262
1263 static void init_status_task(struct status_task *st)
1264 {
1265 memset(st, 0, sizeof(struct status_task));
1266 st->task.pre_select = status_pre_select;
1267 st->task.post_select = status_post_select;
1268 st->sa_time_diff_sign = 1;
1269 st->clock_diff_count = conf.clock_diff_count_arg;
1270 st->current_audio_format_num = -1;
1271 sprintf(st->task.status, "stat");
1272 st->btrn = btr_new_node(&(struct btr_node_description)
1273 EMBRACE(.name = "stat"));
1274 }
1275
1276 static void set_initial_status(void)
1277 {
1278 audiod_status = AUDIOD_ON;
1279 if (!conf.mode_given)
1280 return;
1281 if (!strcmp(conf.mode_arg, "sb")) {
1282 audiod_status = AUDIOD_STANDBY;
1283 return;
1284 }
1285 if (!strcmp(conf.mode_arg, "off")) {
1286 audiod_status = AUDIOD_OFF;
1287 return;
1288 }
1289 if (strcmp(conf.mode_arg, "on"))
1290 PARA_WARNING_LOG("invalid mode\n");
1291 }
1292
1293 __noreturn static void print_help_and_die(void)
1294 {
1295 int d = conf.detailed_help_given;
1296 const char **p = d? audiod_args_info_detailed_help
1297 : audiod_args_info_help;
1298
1299 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1300 AUDIOD_CMDLINE_PARSER_VERSION);
1301 printf_or_die("%s\n\n", audiod_args_info_usage);
1302 for (; *p; p++)
1303 printf_or_die("%s\n", *p);
1304 print_receiver_helps(d);
1305 print_filter_helps(d);
1306 print_writer_helps(d);
1307 exit(0);
1308 }
1309
1310 static void init_colors_or_die(void)
1311 {
1312 int i;
1313
1314 if (!want_colors())
1315 return;
1316 daemon_set_default_log_colors();
1317 daemon_set_flag(DF_COLOR_LOG);
1318 for (i = 0; i < conf.log_color_given; i++)
1319 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1320 }
1321
1322 /**
1323 * the main function of para_audiod
1324 *
1325 * \param argc usual argument count
1326 * \param argv usual argument vector
1327 *
1328 * \return EXIT_SUCCESS or EXIT_FAILURE
1329 *
1330 * \sa para_audiod(1)
1331 * */
1332 int main(int argc, char *argv[])
1333 {
1334 int ret, i;
1335 static struct sched s;
1336 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1337 struct audiod_cmdline_parser_params params = {
1338 .override = 0,
1339 .initialize = 1,
1340 .check_required = 0,
1341 .check_ambiguity = 0,
1342 .print_errors = 1
1343 };
1344
1345 valid_fd_012();
1346 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1347 exit(EXIT_FAILURE);
1348 HANDLE_VERSION_FLAG("audiod", conf);
1349 /* init receivers/filters/writers early to make help work */
1350 recv_init();
1351 filter_init();
1352 writer_init();
1353 if (conf.help_given || conf.detailed_help_given)
1354 print_help_and_die();
1355 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1356 parse_config_or_die();
1357 init_colors_or_die();
1358 init_random_seed_or_die();
1359 daemon_set_flag(DF_LOG_TIME);
1360 daemon_set_flag(DF_LOG_HOSTNAME);
1361 daemon_set_flag(DF_LOG_LL);
1362 if (conf.log_timing_given)
1363 daemon_set_flag(DF_LOG_TIMING);
1364 if (conf.logfile_given) {
1365 daemon_set_logfile(conf.logfile_arg);
1366 daemon_open_log_or_die();
1367 }
1368 ret = parse_stream_args();
1369 if (ret < 0) {
1370 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1371 exit(EXIT_FAILURE);
1372 }
1373 log_welcome("para_audiod");
1374 set_server_start_time(NULL);
1375 set_initial_status();
1376 FOR_EACH_SLOT(i)
1377 clear_slot(i);
1378 setup_signal_handling();
1379 signal_setup_default(sig_task);
1380
1381 init_status_task(stat_task);
1382 init_command_task(cmd_task);
1383
1384 if (conf.daemon_given)
1385 daemonize(false /* parent exits immediately */);
1386
1387 register_task(&sig_task->task);
1388 register_task(&cmd_task->task);
1389 register_task(&stat_task->task);
1390 s.default_timeout.tv_sec = 2;
1391 s.default_timeout.tv_usec = 999 * 1000;
1392 ret = schedule(&s);
1393
1394 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1395 return EXIT_FAILURE;
1396 }