the paraslash-0.4.9 release tarball
[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 struct sched sched = {.max_fileno = 0};
82
83 /**
84 * The task for obtaining para_server's status (para_client stat).
85 *
86 * \sa struct task, struct sched.
87 */
88 struct status_task {
89 /** The associated task structure of audiod. */
90 struct task task;
91 /** Client data associated with the stat task. */
92 struct client_task *ct;
93 /** Do not restart client command until this time. */
94 struct timeval restart_barrier;
95 /** Last time we received status data from para_server. */
96 struct timeval last_status_read;
97 size_t min_iqs;
98 /** The offset value announced by para_server. */
99 int offset_seconds;
100 /** The length of the current audio file as announced by para_server. */
101 int length_seconds;
102 /** The start of the current stream from the view of para_server. */
103 struct timeval server_stream_start;
104 /** The average time deviation between para_server and para_audiod. */
105 struct timeval sa_time_diff;
106 /** Whether client time is ahead of server time. */
107 int sa_time_diff_sign;
108 /** The 'P' and the 'N' flags as announced by para_server. */
109 enum vss_status_flags vss_status;
110 /** Number of times the clock difference is to be checked. */
111 unsigned clock_diff_count;
112 /** When to start the next check for clock difference. */
113 struct timeval clock_diff_barrier;
114 /** Number of the audio format as announced by para_server. */
115 int current_audio_format_num;
116 /* The status task btrn is the child of the client task. */
117 struct btr_node *btrn;
118 };
119
120 /** The array of status items sent by para_server. */
121 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
122
123 /**
124 * the current mode of operation of which can be changed by the on/off/cycle
125 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
126 */
127 int audiod_status = AUDIOD_ON;
128
129 /**
130 * the gengetopt args_info struct that holds information on all command line
131 * arguments
132 */
133 struct audiod_args_info conf;
134
135 static char *socket_name;
136 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
137
138 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
139
140 static struct status_task status_task_struct;
141
142 /**
143 * the task that calls the status command of para_server
144 *
145 * \sa struct status_task
146 */
147 static struct status_task *stat_task = &status_task_struct;
148
149 /**
150 * the task for handling audiod commands
151 *
152 * \sa struct task, struct sched
153 */
154 struct command_task {
155 /** the local listening socket */
156 int fd;
157 /** the associated task structure */
158 struct task task;
159 };
160
161 /** iterate over all supported audio formats */
162 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
163
164 /**
165 * Get the audio format number.
166 *
167 * \param name The name of the audio format.
168 *
169 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
170 * \a name is not a supported audio format.
171 */
172 static int get_audio_format_num(const char *name)
173 {
174 int i;
175
176 while (para_isspace(*name))
177 name++;
178 FOR_EACH_AUDIO_FORMAT(i)
179 if (!strcmp(name, audio_formats[i]))
180 return i;
181 return -E_UNSUPPORTED_AUDIO_FORMAT;
182 }
183
184 static int get_matching_audio_format_nums(const char *re)
185 {
186 int i, ret;
187 regex_t preg;
188
189 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
190 if (ret < 0)
191 return ret;
192 ret = 0;
193 FOR_EACH_AUDIO_FORMAT(i)
194 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
195 ret |= (1 << i);
196 regfree(&preg);
197 return ret;
198 }
199
200 /**
201 * Compute the play time based on information of the given slot.
202 *
203 * \param slot_num The slot number (negative means: no slot).
204 *
205 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
206 * from the status items received from para_server and the start time of the
207 * (first) writer of the given slot.
208 *
209 * It has to to take into account that probably the stream was not started at
210 * the beginning of the file, that the clock between the server and the client
211 * host may differ and that playback of the stream was delayed, e.g. because
212 * the prebuffer filter is used in the filter configuration of the given slot.
213 *
214 * If no writer is active in the given slot, or \a slot_num is negative
215 * (indicating that para_audiod runs in standby mode), an approximation based
216 * only on the status items is computed and the returned string is prefixed
217 * with "~".
218 *
219 * \return A string that must be freed by the caller.
220 */
221 char *get_time_string(int slot_num)
222 {
223 int ret, seconds = 0, length;
224 struct timeval *tmp, sum, sss, /* server stream start */
225 rstime, /* receiver start time */
226 wstime, /* writer start time */
227 wtime, /* now - writer start */
228 rskip; /* receiver start - sss */
229 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
230 char *msg;
231
232 if (audiod_status == AUDIOD_OFF)
233 goto empty;
234 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
235 if (stat_task->length_seconds) /* paused */
236 return NULL;
237 goto empty; /* stopped */
238 }
239 if (audiod_status == AUDIOD_ON && !s)
240 goto empty;
241 /*
242 * Valid status items and playing, set length and tmp to the stream
243 * start. We use the slot info and fall back to the info from current
244 * status items if no slot info is available.
245 */
246 length = stat_task->length_seconds;
247 tmp = &stat_task->server_stream_start;
248 if (s && s->wns) { /* writer active in this slot */
249 btr_get_node_start(s->wns[0].btrn, &wstime);
250 if (wstime.tv_sec != 0) { /* writer wrote something */
251 if (s->server_stream_start.tv_sec == 0) {
252 /* copy status info to slot */
253 s->server_stream_start = stat_task->server_stream_start;
254 s->offset_seconds = stat_task->offset_seconds;
255 s->seconds_total = stat_task->length_seconds;
256 }
257 length = s->seconds_total;
258 tmp = &s->server_stream_start;
259 }
260 }
261 if (stat_task->sa_time_diff_sign > 0)
262 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
263 else
264 tv_add(tmp, &stat_task->sa_time_diff, &sss);
265 if (!s || !s->wns) {
266 struct timeval diff;
267 tv_diff(now, &sss, &diff);
268 seconds = diff.tv_sec + stat_task->offset_seconds;
269 goto out;
270 }
271 tv_diff(now, &wstime, &wtime);
272 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
273 seconds = s->offset_seconds;
274 btr_get_node_start(s->receiver_node->btrn, &rstime);
275 ret = tv_diff(&rstime, &sss, &rskip);
276 if (ret > 0) { /* audiod was started in the middle of the stream */
277 tv_add(&wtime, &rskip, &sum);
278 seconds += sum.tv_sec;
279 } else
280 seconds += wtime.tv_sec;
281 out:
282 seconds = PARA_MIN(seconds, length);
283 seconds = PARA_MAX(seconds, 0);
284 msg = make_message(
285 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
286 s? "" : "~",
287 seconds / 60,
288 seconds % 60,
289 (length - seconds) / 60,
290 (length - seconds) % 60,
291 length? (seconds * 100 + length / 2) / length : 0,
292 length / 60,
293 length % 60
294 );
295 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
296 return msg;
297 empty:
298 return para_strdup(NULL);
299 }
300
301 static int want_colors(void)
302 {
303 if (conf.color_arg == color_arg_no)
304 return 0;
305 if (conf.color_arg == color_arg_yes)
306 return 1;
307 if (conf.logfile_given)
308 return 0;
309 return isatty(STDERR_FILENO);
310 }
311
312 static void parse_config_or_die(void)
313 {
314 int ret;
315 char *config_file;
316 struct audiod_cmdline_parser_params params = {
317 .override = 0,
318 .initialize = 0,
319 .check_required = 1,
320 .check_ambiguity = 0,
321 .print_errors = 1
322 };
323
324 if (conf.config_file_given)
325 config_file = para_strdup(conf.config_file_arg);
326 else {
327 char *home = para_homedir();
328 config_file = make_message("%s/.paraslash/audiod.conf", home);
329 free(home);
330 }
331 ret = file_exists(config_file);
332 if (conf.config_file_given && !ret) {
333 PARA_EMERG_LOG("can not read config file %s\n", config_file);
334 goto err;
335 }
336 if (ret)
337 audiod_cmdline_parser_config_file(config_file, &conf, &params);
338 free(config_file);
339 daemon_set_loglevel(conf.loglevel_arg);
340 return;
341 err:
342 free(config_file);
343 exit(EXIT_FAILURE);
344 }
345
346 static void setup_signal_handling(void)
347 {
348 sig_task->fd = para_signal_init();
349 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
350 para_install_sighandler(SIGINT);
351 para_install_sighandler(SIGTERM);
352 para_install_sighandler(SIGHUP);
353 para_sigaction(SIGPIPE, SIG_IGN);
354 }
355
356 static void clear_slot(int slot_num)
357 {
358 struct slot_info *s = &slot[slot_num];
359
360 PARA_INFO_LOG("clearing slot %d\n", slot_num);
361 memset(s, 0, sizeof(struct slot_info));
362 s->format = -1;
363 }
364
365 static void close_receiver(int slot_num)
366 {
367 struct slot_info *s = &slot[slot_num];
368 struct audio_format_info *a;
369
370 if (s->format < 0 || !s->receiver_node)
371 return;
372 a = &afi[s->format];
373 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
374 audio_formats[s->format], slot_num);
375 a->receiver->close(s->receiver_node);
376 btr_free_node(s->receiver_node->btrn);
377 free(s->receiver_node);
378 s->receiver_node = NULL;
379 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
380 &a->restart_barrier);
381 }
382
383 static void writer_cleanup(struct writer_node *wn)
384 {
385 struct writer *w;
386
387 if (!wn)
388 return;
389 w = writers + wn->writer_num;
390 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
391 w->close(wn);
392 btr_free_node(wn->btrn);
393 }
394
395 static void close_writers(struct slot_info *s)
396 {
397 struct audio_format_info *a;
398 int i;
399
400 if (s->format < 0)
401 return;
402 assert(s->wns);
403 a = afi + s->format;
404 if (a->num_writers == 0)
405 writer_cleanup(s->wns);
406 else {
407 for (i = 0; i < a->num_writers; i++)
408 writer_cleanup(s->wns + i);
409 }
410 free(s->wns);
411 s->wns = NULL;
412 }
413
414 static void close_filters(struct slot_info *s)
415 {
416 int i;
417 struct audio_format_info *a = afi + s->format;
418 if (a->num_filters == 0)
419 return;
420 for (i = 0; i < a->num_filters; i++) {
421 struct filter_node *fn = s->fns + i;
422 struct filter *f;
423
424 if (!fn)
425 continue;
426 f = filters + fn->filter_num;
427 if (f->close)
428 f->close(fn);
429 btr_free_node(fn->btrn);
430 }
431 free(s->fns);
432 s->fns = NULL;
433 }
434
435 /*
436 * Whenever a task commits suicide by returning from post_select with t->error
437 * < 0, it also removes its btr node. We do exactly that to kill a running
438 * task. Note that the scheduler checks t->error also _before_ each pre/post
439 * select call, so the victim will never be scheduled again.
440 */
441 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
442 {
443 if (t->error < 0)
444 return;
445 t->error = error;
446 btr_remove_node(btrn);
447 }
448
449 static void kill_all_decoders(int error)
450 {
451 int i;
452
453 FOR_EACH_SLOT(i) {
454 struct slot_info *s = slot + i;
455 if (s->format < 0)
456 continue;
457 if (!s->receiver_node)
458 continue;
459 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
460 error);
461 }
462 }
463
464 static int get_empty_slot(void)
465 {
466 int i;
467 struct slot_info *s;
468
469 FOR_EACH_SLOT(i) {
470 s = &slot[i];
471 if (s->format < 0) {
472 clear_slot(i);
473 return i;
474 }
475 if (s->wns || s->receiver_node || s->fns)
476 continue;
477 clear_slot(i);
478 return i;
479 }
480 return -E_NO_MORE_SLOTS;
481 }
482
483 static void open_filters(struct slot_info *s)
484 {
485 struct audio_format_info *a = afi + s->format;
486 struct filter_node *fn;
487 int nf = a->num_filters;
488 struct btr_node *parent;
489 int i;
490
491 if (nf == 0)
492 return;
493 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
494 assert(s->fns == NULL);
495 s->fns = para_calloc(nf * sizeof(struct filter_node));
496 parent = s->receiver_node->btrn;
497 for (i = 0; i < nf; i++) {
498 struct filter *f = filters + a->filter_nums[i];
499 fn = s->fns + i;
500 fn->filter_num = a->filter_nums[i];
501 fn->conf = a->filter_conf[i];
502 fn->task.pre_select = f->pre_select;
503 fn->task.post_select = f->post_select;
504
505 fn->btrn = btr_new_node(&(struct btr_node_description)
506 EMBRACE(.name = f->name, .parent = parent,
507 .handler = f->execute, .context = fn));
508
509 f->open(fn);
510 register_task(&sched, &fn->task);
511 parent = fn->btrn;
512 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
513 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
514 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
515 }
516 }
517
518 static void open_writers(struct slot_info *s)
519 {
520 int i;
521 struct audio_format_info *a = afi + s->format;
522 struct writer_node *wn;
523 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
524
525 assert(s->wns == NULL);
526 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
527 * sizeof(struct writer_node));
528 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
529 for (i = 0; i < a->num_writers; i++) {
530 wn = s->wns + i;
531 wn->conf = a->writer_conf[i];
532 wn->writer_num = a->writer_nums[i];
533 register_writer_node(wn, parent, &sched);
534 }
535 }
536
537 /* returns slot num on success */
538 static int open_receiver(int format)
539 {
540 struct audio_format_info *a = &afi[format];
541 struct slot_info *s;
542 int ret, slot_num;
543 struct receiver *r = a->receiver;
544 struct receiver_node *rn;
545
546 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
547 ret = get_empty_slot();
548 if (ret < 0)
549 return ret;
550 slot_num = ret;
551 rn = para_calloc(sizeof(*rn));
552 rn->receiver = r;
553 rn->conf = a->receiver_conf;
554 rn->btrn = btr_new_node(&(struct btr_node_description)
555 EMBRACE(.name = r->name, .context = rn));
556 ret = r->open(rn);
557 if (ret < 0) {
558 btr_free_node(rn->btrn);
559 free(rn);
560 return ret;
561 }
562 s = &slot[slot_num];
563 s->format = format;
564 s->receiver_node = rn;
565 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
566 audio_formats[format], r->name, slot_num);
567 rn->task.pre_select = r->pre_select;
568 rn->task.post_select = r->post_select;
569 sprintf(rn->task.status, "%s receiver node", r->name);
570 register_task(&sched, &rn->task);
571 return slot_num;
572 }
573
574 static bool receiver_running(void)
575 {
576 int i;
577 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
578
579 FOR_EACH_SLOT(i) {
580 struct slot_info *s = &slot[i];
581 long unsigned ss2 = s->server_stream_start.tv_sec;
582
583 if (!s->receiver_node)
584 continue;
585 if (s->receiver_node->task.error >= 0)
586 return true;
587 if (ss1 == ss2)
588 return true;
589 }
590 return false;
591 }
592
593 /**
594 * Return the root node of the current buffer tree.
595 *
596 * This is only used for stream grabbing.
597 *
598 * \return \p NULL if no slot is currently active. If more than one buffer tree
599 * exists, the node corresponding to the most recently started receiver is
600 * returned.
601 */
602 struct btr_node *audiod_get_btr_root(void)
603 {
604 int i, newest_slot = -1;
605 struct timeval newest_rstime = {0, 0};
606
607 FOR_EACH_SLOT(i) {
608 struct slot_info *s = &slot[i];
609 struct timeval rstime;
610 if (!s->receiver_node)
611 continue;
612 if (s->receiver_node->task.error < 0)
613 continue;
614 btr_get_node_start(s->receiver_node->btrn, &rstime);
615 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
616 continue;
617 newest_rstime = rstime;
618 newest_slot = i;
619 }
620 if (newest_slot == -1)
621 return NULL;
622 return slot[newest_slot].receiver_node->btrn;
623 }
624
625 /* whether a new instance of a decoder should be started. */
626 static bool must_start_decoder(void)
627 {
628 int cafn = stat_task->current_audio_format_num;
629 unsigned vs = stat_task->vss_status;
630
631 if (audiod_status != AUDIOD_ON)
632 return false;
633 if (cafn < 0)
634 return false;
635 if (!stat_task->ct)
636 return false;
637 if (vs & VSS_STATUS_FLAG_NEXT)
638 return false;
639 if (!(vs & VSS_STATUS_FLAG_PLAYING))
640 return false;
641 if (receiver_running())
642 return false;
643 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
644 return false;
645 return true;
646 }
647
648 static unsigned compute_time_diff(const struct timeval *status_time)
649 {
650 struct timeval tmp, diff;
651 static unsigned count;
652 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
653 const struct timeval max_deviation = {0, 500 * 1000};
654 const int time_smooth = 5;
655
656 if (!status_time)
657 return count;
658 sign = tv_diff(status_time, now, &diff);
659 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
660 // sign, sa_time_diff_sign);
661 if (!count) {
662 sa_time_diff_sign = sign;
663 stat_task->sa_time_diff = diff;
664 count++;
665 goto out;
666 }
667 if (count > 5) {
668 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
669 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
670 PARA_WARNING_LOG("time diff jump: %lims\n",
671 s * tv2ms(&tmp));
672 }
673 count++;
674 sa_time_diff_sign = tv_convex_combination(
675 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
676 count > 10? sign : sign * time_smooth, &diff,
677 &tmp);
678 stat_task->sa_time_diff = tmp;
679 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
680 sign < 0? "-" : "+",
681 tv2ms(&diff),
682 sa_time_diff_sign < 0? "-" : "+",
683 tv2ms(&stat_task->sa_time_diff)
684 );
685 out:
686 stat_task->sa_time_diff_sign = sa_time_diff_sign;
687 return count;
688 }
689
690 static int update_item(int itemnum, char *buf)
691 {
692 long unsigned sec, usec;
693
694 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
695 return 1;
696 free(stat_item_values[itemnum]);
697 stat_item_values[itemnum] = para_strdup(buf);
698 stat_client_write_item(itemnum);
699 switch (itemnum) {
700 case SI_STATUS_FLAGS:
701 stat_task->vss_status = 0;
702 if (strchr(buf, 'N'))
703 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
704 if (strchr(buf, 'P'))
705 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
706 break;
707 case SI_OFFSET:
708 stat_task->offset_seconds = atoi(buf);
709 break;
710 case SI_SECONDS_TOTAL:
711 stat_task->length_seconds = atoi(buf);
712 break;
713 case SI_STREAM_START:
714 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
715 stat_task->server_stream_start.tv_sec = sec;
716 stat_task->server_stream_start.tv_usec = usec;
717 }
718 break;
719 case SI_CURRENT_TIME:
720 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
721 struct timeval tv = {sec, usec};
722 compute_time_diff(&tv);
723 }
724 break;
725 case SI_FORMAT:
726 stat_task->current_audio_format_num
727 = get_audio_format_num(buf);
728 }
729 return 1;
730 }
731
732 static int parse_stream_command(const char *txt, char **cmd)
733 {
734 int ret, len;
735 char *re, *p = strchr(txt, ':');
736
737 if (!p)
738 return -E_MISSING_COLON;
739 *cmd = p + 1;
740 len = p - txt;
741 re = malloc(len + 1);
742 strncpy(re, txt, len);
743 re[len] = '\0';
744 ret = get_matching_audio_format_nums(re);
745 free(re);
746 return ret;
747 }
748
749 static int add_filter(int format, char *cmdline)
750 {
751 struct audio_format_info *a = &afi[format];
752 int filter_num, nf = a->num_filters;
753 void *cfg;
754
755 filter_num = check_filter_arg(cmdline, &cfg);
756 if (filter_num < 0)
757 return filter_num;
758 a->filter_conf = para_realloc(a->filter_conf,
759 (nf + 1) * sizeof(void *));
760 a->filter_nums = para_realloc(a->filter_nums,
761 (nf + 1) * sizeof(unsigned));
762 a->filter_nums[nf] = filter_num;
763 a->filter_conf[nf] = cfg;
764 a->num_filters++;
765 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
766 filters[filter_num].name);
767 return filter_num;
768 }
769
770 static int parse_writer_args(void)
771 {
772 int i, ret;
773 char *cmd;
774 struct audio_format_info *a;
775
776 for (i = 0; i < conf.writer_given; i++) {
777 void *wconf;
778 int j, nw, writer_num, af_mask;
779
780 ret = parse_stream_command(conf.writer_arg[i], &cmd);
781 if (ret < 0)
782 return ret;
783 af_mask = ret;
784 FOR_EACH_AUDIO_FORMAT(j) {
785 a = afi + j;
786 if ((af_mask & (1 << j)) == 0) /* no match */
787 continue;
788 wconf = check_writer_arg_or_die(cmd, &writer_num);
789 nw = a->num_writers;
790 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
791 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
792 a->writer_nums[nw] = writer_num;
793 a->writer_conf[nw] = wconf;
794 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
795 nw, writer_names[writer_num]);
796 a->num_writers++;
797 }
798 }
799 /* Use default writer for audio formats which are not yet set up. */
800 FOR_EACH_AUDIO_FORMAT(i) {
801 struct writer *w = writers + DEFAULT_WRITER;
802 a = afi + i;
803 if (a->num_writers > 0)
804 continue; /* already set up */
805 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
806 writer_names[DEFAULT_WRITER]);
807 a->writer_nums = para_malloc(sizeof(int));
808 a->writer_nums[0] = DEFAULT_WRITER;
809 a->writer_conf = para_malloc(sizeof(void *));
810 a->writer_conf[0] = w->parse_config_or_die("");
811 a->num_writers = 1;
812 }
813 return 1;
814 }
815
816 static int parse_receiver_args(void)
817 {
818 int i, ret, receiver_num;
819 char *cmd = NULL;
820 struct audio_format_info *a;
821
822 for (i = conf.receiver_given - 1; i >= 0; i--) {
823 char *arg;
824 int j, af_mask;
825
826 ret = parse_stream_command(conf.receiver_arg[i], &arg);
827 if (ret < 0)
828 goto out;
829 af_mask = ret;
830 FOR_EACH_AUDIO_FORMAT(j) {
831 a = afi + j;
832 if ((af_mask & (1 << j)) == 0) /* no match */
833 continue;
834 /*
835 * If multiple receivers are given for this audio format, the
836 * last one wins and we have to free the previous receiver
837 * config here. Since we are iterating backwards, the winning
838 * receiver arg is in fact the first one given.
839 */
840 if (a->receiver_conf)
841 a->receiver->free_config(a->receiver_conf);
842 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
843 ret = -E_RECV_SYNTAX;
844 if (!a->receiver_conf)
845 goto out;
846 a->receiver = receivers + receiver_num;
847 }
848 }
849 /*
850 * Use the first available receiver with no arguments for those audio
851 * formats for which no receiver was specified.
852 */
853 cmd = para_strdup(receivers[0].name);
854 FOR_EACH_AUDIO_FORMAT(i) {
855 a = &afi[i];
856 if (a->receiver_conf)
857 continue;
858 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
859 if (!a->receiver_conf)
860 return -E_RECV_SYNTAX;
861 a->receiver = &receivers[receiver_num];
862 }
863 FOR_EACH_AUDIO_FORMAT(i) {
864 a = afi + i;
865 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
866 audio_formats[i], a->receiver->name);
867 }
868 ret = 1;
869 out:
870 free(cmd);
871 return ret;
872 }
873
874 static int init_default_filters(void)
875 {
876 int i, ret = 1;
877
878 FOR_EACH_AUDIO_FORMAT(i) {
879 struct audio_format_info *a = &afi[i];
880 char *tmp;
881 int j;
882
883 if (a->num_filters)
884 continue; /* no default -- nothing to to */
885 /*
886 * udp and dccp streams are fec-encoded, so add fecdec as the
887 * first filter.
888 */
889 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
890 strcmp(afi[i].receiver->name, "dccp") == 0) {
891 tmp = para_strdup("fecdec");
892 add_filter(i, tmp);
893 free(tmp);
894 if (ret < 0)
895 goto out;
896 }
897 /* add "dec" to audio format name */
898 tmp = make_message("%sdec", audio_formats[i]);
899 for (j = 0; filters[j].name; j++)
900 if (!strcmp(tmp, filters[j].name))
901 break;
902 free(tmp);
903 ret = -E_UNSUPPORTED_FILTER;
904 if (!filters[j].name)
905 goto out;
906 tmp = para_strdup(filters[j].name);
907 ret = add_filter(i, tmp);
908 free(tmp);
909 if (ret < 0)
910 goto out;
911 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
912 filters[j].name);
913 }
914 out:
915 return ret;
916 }
917
918 static int parse_filter_args(void)
919 {
920 int i, j, ret, af_mask;
921
922 if (!conf.no_default_filters_given)
923 return init_default_filters();
924 for (i = 0; i < conf.filter_given; i++) {
925 char *arg;
926 ret = parse_stream_command(conf.filter_arg[i], &arg);
927 if (ret < 0)
928 goto out;
929 af_mask = ret;
930 FOR_EACH_AUDIO_FORMAT(j) {
931 if ((af_mask & (1 << j)) == 0) /* no match */
932 continue;
933 ret = add_filter(j, arg);
934 if (ret < 0)
935 goto out;
936 }
937 }
938 ret = init_default_filters(); /* use default values for the rest */
939 out:
940 return ret;
941 }
942
943 static int parse_stream_args(void)
944 {
945 int ret;
946
947 ret = parse_receiver_args();
948 if (ret < 0)
949 return ret;
950 ret = parse_filter_args();
951 if (ret < 0)
952 return ret;
953 ret = parse_writer_args();
954 if (ret < 0)
955 return ret;
956 return 1;
957 }
958
959 /* does not unlink socket on errors */
960 static int audiod_get_socket(void)
961 {
962 struct sockaddr_un unix_addr;
963 int ret, fd;
964
965 if (conf.socket_given)
966 socket_name = para_strdup(conf.socket_arg);
967 else {
968 char *hn = para_hostname();
969 socket_name = make_message("/var/paraslash/audiod_socket.%s",
970 hn);
971 free(hn);
972 }
973 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
974 if (conf.force_given)
975 unlink(socket_name);
976 ret = create_local_socket(socket_name, &unix_addr,
977 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
978 if (ret < 0)
979 goto err;
980 fd = ret;
981 if (listen(fd , 5) < 0) {
982 ret = -ERRNO_TO_PARA_ERROR(errno);
983 goto err;
984 }
985 ret = mark_fd_nonblocking(fd);
986 if (ret < 0)
987 goto err;
988 return fd;
989 err:
990 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
991 exit(EXIT_FAILURE);
992 }
993
994 static void signal_pre_select(struct sched *s, struct task *t)
995 {
996 struct signal_task *st = container_of(t, struct signal_task, task);
997 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
998 }
999
1000 static void signal_post_select(struct sched *s, __a_unused struct task *t)
1001 {
1002 int signum;
1003
1004 signum = para_next_signal(&s->rfds);
1005 switch (signum) {
1006 case SIGINT:
1007 case SIGTERM:
1008 case SIGHUP:
1009 PARA_EMERG_LOG("terminating on signal %d\n", 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 ret = handle_connect(ct->fd, &s->rfds);
1041 if (ret < 0)
1042 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1043 audiod_status_dump();
1044 }
1045
1046 static void init_command_task(struct command_task *ct)
1047 {
1048 ct->task.pre_select = command_pre_select;
1049 ct->task.post_select = command_post_select;
1050 ct->task.error = 0;
1051 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1052 sprintf(ct->task.status, "command task");
1053 }
1054
1055 static void close_stat_pipe(void)
1056 {
1057 if (!stat_task->ct)
1058 return;
1059 client_close(stat_task->ct);
1060 stat_task->ct = NULL;
1061 clear_and_dump_items();
1062 stat_task->length_seconds = 0;
1063 stat_task->offset_seconds = 0;
1064 stat_task->vss_status = 0;
1065 stat_task->current_audio_format_num = -1;
1066 audiod_status_dump();
1067 }
1068
1069 /**
1070 * close the connection to para_server and exit
1071 *
1072 * \param status the exit status which is passed to exit(3)
1073 * \param msg the log message
1074 *
1075 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1076 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1077 * EXIT_FAILURE.
1078 *
1079 * \sa exit(3)
1080 */
1081 void __noreturn clean_exit(int status, const char *msg)
1082 {
1083 PARA_EMERG_LOG("%s\n", msg);
1084 if (socket_name)
1085 unlink(socket_name);
1086 close_stat_pipe();
1087 exit(status);
1088 }
1089
1090 /* avoid busy loop if server is down */
1091 static void set_stat_task_restart_barrier(unsigned seconds)
1092 {
1093 struct timeval delay = {seconds, 0};
1094 tv_add(now, &delay, &stat_task->restart_barrier);
1095 }
1096
1097 static void try_to_close_slot(int slot_num)
1098 {
1099 struct slot_info *s = &slot[slot_num];
1100 struct audio_format_info *a = afi + s->format;
1101 int i;
1102
1103 if (s->format < 0)
1104 return;
1105 if (s->receiver_node && s->receiver_node->task.error >= 0)
1106 return;
1107 for (i = 0; i < a->num_filters; i++)
1108 if (s->fns && s->fns[i].task.error >= 0)
1109 return;
1110 if (a->num_writers > 0) {
1111 for (i = 0; i < a->num_writers; i++)
1112 if (s->wns && s->wns[i].task.error >= 0)
1113 return;
1114 } else {
1115 if (s->wns && s->wns[0].task.error >= 0)
1116 return;
1117 }
1118 PARA_INFO_LOG("closing slot %d\n", slot_num);
1119 close_writers(s);
1120 close_filters(s);
1121 close_receiver(slot_num);
1122 clear_slot(slot_num);
1123 }
1124
1125 /*
1126 * Check if any receivers/filters/writers need to be started and do so if
1127 * necessary.
1128 */
1129 static void start_stop_decoders(void)
1130 {
1131 int i, ret;
1132 struct slot_info *sl;
1133 struct audio_format_info *a;
1134
1135 FOR_EACH_SLOT(i)
1136 try_to_close_slot(i);
1137 if (audiod_status != AUDIOD_ON ||
1138 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1139 return kill_all_decoders(-E_NOT_PLAYING);
1140 if (!must_start_decoder())
1141 return;
1142 ret = open_receiver(stat_task->current_audio_format_num);
1143 if (ret < 0) {
1144 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1145 return;
1146 }
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(&sched);
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 && audiod_status == AUDIOD_OFF)
1167 goto min_delay;
1168 if (!st->ct && audiod_status != AUDIOD_OFF)
1169 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1170 if (cafn >= 0)
1171 sched_request_barrier(&afi[cafn].restart_barrier, s);
1172 /*
1173 * If para_server is playing we'd like to have a smooth time display
1174 * even if we are running in standby mode. So we request a timeout that
1175 * expires at the next full second.
1176 */
1177 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1178 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1179 return;
1180 min_delay:
1181 sched_min_delay(s);
1182 }
1183
1184 /* restart the client task if necessary */
1185 static void status_post_select(struct sched *s, struct task *t)
1186 {
1187 struct status_task *st = container_of(t, struct status_task, task);
1188
1189 if (audiod_status == AUDIOD_OFF) {
1190 if (!st->ct)
1191 goto out;
1192 if (st->ct->task.error >= 0) {
1193 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1194 goto out;
1195 }
1196 if (st->ct->task.error >= 0)
1197 goto out;
1198 close_stat_pipe();
1199 st->clock_diff_count = conf.clock_diff_count_arg;
1200 goto out;
1201 }
1202 if (st->ct) {
1203 char *buf;
1204 size_t sz;
1205 int ret;
1206 if (st->ct->task.error < 0) {
1207 if (st->ct->task.error >= 0)
1208 goto out;
1209 close_stat_pipe();
1210 goto out;
1211 }
1212 if (st->ct->status != CL_RECEIVING)
1213 goto out;
1214 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1215 if (ret <= 0) {
1216 struct timeval diff;
1217 tv_diff(now, &st->last_status_read, &diff);
1218 if (diff.tv_sec > 61)
1219 kill_btrn(st->ct->btrn, &st->ct->task,
1220 -E_STATUS_TIMEOUT);
1221 goto out;
1222 }
1223 btr_merge(st->btrn, st->min_iqs);
1224 sz = btr_next_buffer(st->btrn, &buf);
1225 ret = for_each_stat_item(buf, sz, update_item);
1226 if (ret < 0) {
1227 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1228 goto out;
1229 }
1230 if (sz != ret) {
1231 btr_consume(st->btrn, sz - ret);
1232 st->last_status_read = *now;
1233 st->min_iqs = 0;
1234 } else /* current status item crosses buffers */
1235 st->min_iqs = sz + 1;
1236 goto out;
1237 }
1238 btr_drain(st->btrn);
1239 st->current_audio_format_num = -1;
1240 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1241 goto out;
1242 if (st->clock_diff_count) { /* get status only one time */
1243 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1244 int argc = 5;
1245 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1246 st->clock_diff_count--;
1247 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1248 set_stat_task_restart_barrier(2);
1249
1250 } else {
1251 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1252 int argc = 4;
1253 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1254 set_stat_task_restart_barrier(5);
1255 }
1256 free(stat_item_values[SI_BASENAME]);
1257 stat_item_values[SI_BASENAME] = para_strdup(
1258 "no connection to para_server");
1259 stat_client_write_item(SI_BASENAME);
1260 st->last_status_read = *now;
1261 out:
1262 start_stop_decoders();
1263 }
1264
1265 static void init_status_task(struct status_task *st)
1266 {
1267 memset(st, 0, sizeof(struct status_task));
1268 st->task.pre_select = status_pre_select;
1269 st->task.post_select = status_post_select;
1270 st->sa_time_diff_sign = 1;
1271 st->clock_diff_count = conf.clock_diff_count_arg;
1272 st->current_audio_format_num = -1;
1273 sprintf(st->task.status, "stat");
1274 st->btrn = btr_new_node(&(struct btr_node_description)
1275 EMBRACE(.name = "stat"));
1276 }
1277
1278 static void set_initial_status(void)
1279 {
1280 audiod_status = AUDIOD_ON;
1281 if (!conf.mode_given)
1282 return;
1283 if (!strcmp(conf.mode_arg, "sb")) {
1284 audiod_status = AUDIOD_STANDBY;
1285 return;
1286 }
1287 if (!strcmp(conf.mode_arg, "off")) {
1288 audiod_status = AUDIOD_OFF;
1289 return;
1290 }
1291 if (strcmp(conf.mode_arg, "on"))
1292 PARA_WARNING_LOG("invalid mode\n");
1293 }
1294
1295 __noreturn static void print_help_and_die(void)
1296 {
1297 int d = conf.detailed_help_given;
1298 const char **p = d? audiod_args_info_detailed_help
1299 : audiod_args_info_help;
1300
1301 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1302 AUDIOD_CMDLINE_PARSER_VERSION);
1303 printf_or_die("%s\n\n", audiod_args_info_usage);
1304 for (; *p; p++)
1305 printf_or_die("%s\n", *p);
1306 print_receiver_helps(d);
1307 print_filter_helps(d);
1308 print_writer_helps(d);
1309 exit(0);
1310 }
1311
1312 static void init_colors_or_die(void)
1313 {
1314 int i;
1315
1316 if (!want_colors())
1317 return;
1318 daemon_set_default_log_colors();
1319 daemon_set_flag(DF_COLOR_LOG);
1320 for (i = 0; i < conf.log_color_given; i++)
1321 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1322 }
1323
1324 /**
1325 * the main function of para_audiod
1326 *
1327 * \param argc usual argument count
1328 * \param argv usual argument vector
1329 *
1330 * \return EXIT_SUCCESS or EXIT_FAILURE
1331 *
1332 * \sa para_audiod(1)
1333 * */
1334 int main(int argc, char *argv[])
1335 {
1336 int ret, i;
1337 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1338 struct audiod_cmdline_parser_params params = {
1339 .override = 0,
1340 .initialize = 1,
1341 .check_required = 0,
1342 .check_ambiguity = 0,
1343 .print_errors = 1
1344 };
1345
1346 valid_fd_012();
1347 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1348 exit(EXIT_FAILURE);
1349 HANDLE_VERSION_FLAG("audiod", conf);
1350 /* init receivers/filters/writers early to make help work */
1351 recv_init();
1352 filter_init();
1353 writer_init();
1354 if (conf.help_given || conf.detailed_help_given)
1355 print_help_and_die();
1356 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1357 parse_config_or_die();
1358 init_colors_or_die();
1359 init_random_seed_or_die();
1360 daemon_set_flag(DF_LOG_TIME);
1361 daemon_set_flag(DF_LOG_HOSTNAME);
1362 daemon_set_flag(DF_LOG_LL);
1363 if (conf.log_timing_given)
1364 daemon_set_flag(DF_LOG_TIMING);
1365 if (conf.logfile_given) {
1366 daemon_set_logfile(conf.logfile_arg);
1367 daemon_open_log_or_die();
1368 }
1369 ret = parse_stream_args();
1370 if (ret < 0) {
1371 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1372 exit(EXIT_FAILURE);
1373 }
1374 log_welcome("para_audiod");
1375 set_server_start_time(NULL);
1376 set_initial_status();
1377 FOR_EACH_SLOT(i)
1378 clear_slot(i);
1379 setup_signal_handling();
1380 signal_setup_default(sig_task);
1381
1382 init_status_task(stat_task);
1383 init_command_task(cmd_task);
1384
1385 if (conf.daemon_given)
1386 daemonize(false /* parent exits immediately */);
1387
1388 register_task(&sched, &sig_task->task);
1389 register_task(&sched, &cmd_task->task);
1390 register_task(&sched, &stat_task->task);
1391 sched.default_timeout.tv_sec = 2;
1392 sched.default_timeout.tv_usec = 999 * 1000;
1393 ret = schedule(&sched);
1394
1395 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1396 return EXIT_FAILURE;
1397 }