eff58fda1b7ead6c327594afb60165a1bfde4fb1
[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 /** define the array of error lists needed by para_audiod */
37 INIT_AUDIOD_ERRLISTS;
38 /** define the array containing all supported audio formats */
39 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
40
41 /** Defines how audiod handles one supported audio format. */
42 struct audio_format_info {
43 /** pointer to the receiver for this audio format */
44 struct receiver *receiver;
45 /** the receiver configuration */
46 void *receiver_conf;
47 /** the number of filters that should be activated for this audio format */
48 unsigned int num_filters;
49 /** Array of filter numbers to be activated. */
50 unsigned *filter_nums;
51 /** Pointer to the array of filter configurations. */
52 void **filter_conf;
53 /** the number of filters that should be activated for this audio format */
54 unsigned int num_writers;
55 /** Array of writer numbers to be activated. */
56 int *writer_nums;
57 /** pointer to the array of writer configurations */
58 void **writer_conf;
59 /** do not start receiver/filters/writer before this time */
60 struct timeval restart_barrier;
61 };
62
63 /**
64 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
65 * be associated with a receiver/filter/writer triple. This array holds all
66 * information on the status of these slots.
67 *
68 * \sa struct slot_info
69 * */
70 struct slot_info slot[MAX_STREAM_SLOTS];
71
72 /** The vss status flags audiod is interested in. */
73 enum vss_status_flags {
74 /** Whether the 'N' flag is set. */
75 VSS_STATUS_FLAG_NEXT = 1,
76 /** The 'P' flag is set. */
77 VSS_STATUS_FLAG_PLAYING = 2,
78 };
79
80 /**
81 * The task for obtaining para_server's status (para_client stat).
82 *
83 * \sa struct task, struct sched.
84 */
85 struct status_task {
86 /** The associated task structure of audiod. */
87 struct task task;
88 /** Client data associated with the stat task. */
89 struct client_task *ct;
90 /** Do not restart client command until this time. */
91 struct timeval restart_barrier;
92 /** Last time we received status data from para_server. */
93 struct timeval last_status_read;
94 size_t min_iqs;
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
146 /**
147 * the task for handling audiod commands
148 *
149 * \sa struct task, struct sched
150 */
151 struct command_task {
152 /** the local listening socket */
153 int fd;
154 /** the associated task structure */
155 struct task task;
156 };
157
158 /** iterate over all supported audio formats */
159 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
160
161 /**
162 * Get the audio format number.
163 *
164 * \param name The name of the audio format.
165 *
166 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
167 * \a name is not a supported audio format.
168 */
169 static int get_audio_format_num(const char *name)
170 {
171 int i;
172
173 while (para_isspace(*name))
174 name++;
175 FOR_EACH_AUDIO_FORMAT(i)
176 if (!strcmp(name, audio_formats[i]))
177 return i;
178 return -E_UNSUPPORTED_AUDIO_FORMAT;
179 }
180
181 static int get_matching_audio_format_nums(const char *re)
182 {
183 int i, ret;
184 regex_t preg;
185
186 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
187 if (ret < 0)
188 return ret;
189 ret = 0;
190 FOR_EACH_AUDIO_FORMAT(i)
191 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
192 ret |= (1 << i);
193 regfree(&preg);
194 return ret;
195 }
196
197 /**
198 * Compute the play time based on information of the given slot.
199 *
200 * \param slot_num The slot number (negative means: no slot).
201 *
202 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
203 * from the status items received from para_server and the start time of the
204 * (first) writer of the given slot.
205 *
206 * It has to to take into account that probably the stream was not started at
207 * the beginning of the file, that the clock between the server and the client
208 * host may differ and that playback of the stream was delayed, e.g. because
209 * the prebuffer filter is used in the filter configuration of the given slot.
210 *
211 * If no writer is active in the given slot, or \a slot_num is negative
212 * (indicating that para_audiod runs in standby mode), an approximation based
213 * only on the status items is computed and the returned string is prefixed
214 * with "~".
215 *
216 * \return A string that must be freed by the caller.
217 */
218 char *get_time_string(int slot_num)
219 {
220 int ret, seconds = 0, length;
221 struct timeval *tmp, sum, sss, /* server stream start */
222 rstime, /* receiver start time */
223 wstime, /* writer start time */
224 wtime, /* now - writer start */
225 rskip; /* receiver start - sss */
226 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
227 char *msg;
228
229 if (audiod_status == AUDIOD_OFF)
230 goto empty;
231 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
232 if (stat_task->length_seconds) /* paused */
233 return NULL;
234 goto empty; /* stopped */
235 }
236 if (audiod_status == AUDIOD_ON && !s)
237 goto empty;
238 /*
239 * Valid status items and playing, set length and tmp to the stream
240 * start. We use the slot info and fall back to the info from current
241 * status items if no slot info is available.
242 */
243 length = stat_task->length_seconds;
244 tmp = &stat_task->server_stream_start;
245 if (s && s->wns) { /* writer active in this slot */
246 btr_get_node_start(s->wns[0].btrn, &wstime);
247 if (wstime.tv_sec != 0) { /* writer wrote something */
248 if (s->server_stream_start.tv_sec == 0) {
249 /* copy status info to slot */
250 s->server_stream_start = stat_task->server_stream_start;
251 s->offset_seconds = stat_task->offset_seconds;
252 s->seconds_total = stat_task->length_seconds;
253 }
254 length = s->seconds_total;
255 tmp = &s->server_stream_start;
256 }
257 }
258 if (stat_task->sa_time_diff_sign > 0)
259 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
260 else
261 tv_add(tmp, &stat_task->sa_time_diff, &sss);
262 if (!s || !s->wns) {
263 struct timeval diff;
264 tv_diff(now, &sss, &diff);
265 seconds = diff.tv_sec + stat_task->offset_seconds;
266 goto out;
267 }
268 tv_diff(now, &wstime, &wtime);
269 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
270 seconds = s->offset_seconds;
271 btr_get_node_start(s->receiver_node->btrn, &rstime);
272 ret = tv_diff(&rstime, &sss, &rskip);
273 if (ret > 0) { /* audiod was started in the middle of the stream */
274 tv_add(&wtime, &rskip, &sum);
275 seconds += sum.tv_sec;
276 } else
277 seconds += wtime.tv_sec;
278 out:
279 seconds = PARA_MIN(seconds, length);
280 seconds = PARA_MAX(seconds, 0);
281 msg = make_message(
282 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
283 s? "" : "~",
284 seconds / 60,
285 seconds % 60,
286 (length - seconds) / 60,
287 (length - seconds) % 60,
288 length? (seconds * 100 + length / 2) / length : 0,
289 length / 60,
290 length % 60
291 );
292 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
293 return msg;
294 empty:
295 return para_strdup(NULL);
296 }
297
298 static int want_colors(void)
299 {
300 if (conf.color_arg == color_arg_no)
301 return 0;
302 if (conf.color_arg == color_arg_yes)
303 return 1;
304 if (conf.logfile_given)
305 return 0;
306 return isatty(STDERR_FILENO);
307 }
308
309 static void parse_config_or_die(void)
310 {
311 int ret;
312 char *config_file;
313 struct audiod_cmdline_parser_params params = {
314 .override = 0,
315 .initialize = 0,
316 .check_required = 1,
317 .check_ambiguity = 0,
318 .print_errors = 1
319 };
320
321 if (conf.config_file_given)
322 config_file = para_strdup(conf.config_file_arg);
323 else {
324 char *home = para_homedir();
325 config_file = make_message("%s/.paraslash/audiod.conf", home);
326 free(home);
327 }
328 ret = file_exists(config_file);
329 if (conf.config_file_given && !ret) {
330 PARA_EMERG_LOG("can not read config file %s\n", config_file);
331 goto err;
332 }
333 if (ret)
334 audiod_cmdline_parser_config_file(config_file, &conf, &params);
335 free(config_file);
336 daemon_set_loglevel(conf.loglevel_arg);
337 return;
338 err:
339 free(config_file);
340 exit(EXIT_FAILURE);
341 }
342
343 static void setup_signal_handling(void)
344 {
345 sig_task->fd = para_signal_init();
346 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
347 para_install_sighandler(SIGINT);
348 para_install_sighandler(SIGTERM);
349 para_install_sighandler(SIGHUP);
350 para_sigaction(SIGPIPE, SIG_IGN);
351 }
352
353 static void clear_slot(int slot_num)
354 {
355 struct slot_info *s = &slot[slot_num];
356
357 PARA_INFO_LOG("clearing slot %d\n", slot_num);
358 memset(s, 0, sizeof(struct slot_info));
359 s->format = -1;
360 }
361
362 static void close_receiver(int slot_num)
363 {
364 struct slot_info *s = &slot[slot_num];
365 struct audio_format_info *a;
366
367 if (s->format < 0 || !s->receiver_node)
368 return;
369 a = &afi[s->format];
370 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
371 audio_formats[s->format], slot_num);
372 a->receiver->close(s->receiver_node);
373 btr_free_node(s->receiver_node->btrn);
374 free(s->receiver_node);
375 s->receiver_node = NULL;
376 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
377 &a->restart_barrier);
378 }
379
380 static void writer_cleanup(struct writer_node *wn)
381 {
382 struct writer *w;
383
384 if (!wn)
385 return;
386 w = writers + wn->writer_num;
387 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
388 w->close(wn);
389 btr_free_node(wn->btrn);
390 }
391
392 static void close_writers(struct slot_info *s)
393 {
394 struct audio_format_info *a;
395 int i;
396
397 if (s->format < 0)
398 return;
399 assert(s->wns);
400 a = afi + s->format;
401 if (a->num_writers == 0)
402 writer_cleanup(s->wns);
403 else {
404 for (i = 0; i < a->num_writers; i++)
405 writer_cleanup(s->wns + i);
406 }
407 free(s->wns);
408 s->wns = NULL;
409 }
410
411 static void close_filters(struct slot_info *s)
412 {
413 int i;
414 struct audio_format_info *a = afi + s->format;
415 if (a->num_filters == 0)
416 return;
417 for (i = 0; i < a->num_filters; i++) {
418 struct filter_node *fn = s->fns + i;
419 struct filter *f;
420
421 if (!fn)
422 continue;
423 f = filters + fn->filter_num;
424 if (f->close)
425 f->close(fn);
426 btr_free_node(fn->btrn);
427 }
428 free(s->fns);
429 s->fns = NULL;
430 }
431
432 /*
433 * Whenever a task commits suicide by returning from post_select with t->error
434 * < 0, it also removes its btr node. We do exactly that to kill a running
435 * task. Note that the scheduler checks t->error also _before_ each pre/post
436 * select call, so the victim will never be scheduled again.
437 */
438 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
439 {
440 if (t->error < 0)
441 return;
442 t->error = error;
443 btr_remove_node(btrn);
444 }
445
446 static void kill_all_decoders(int error)
447 {
448 int i;
449
450 FOR_EACH_SLOT(i) {
451 struct slot_info *s = slot + i;
452 if (s->format < 0)
453 continue;
454 if (!s->receiver_node)
455 continue;
456 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
457 error);
458 }
459 }
460
461 static int get_empty_slot(void)
462 {
463 int i;
464 struct slot_info *s;
465
466 FOR_EACH_SLOT(i) {
467 s = &slot[i];
468 if (s->format < 0) {
469 clear_slot(i);
470 return i;
471 }
472 if (s->wns || s->receiver_node || s->fns)
473 continue;
474 clear_slot(i);
475 return i;
476 }
477 return -E_NO_MORE_SLOTS;
478 }
479
480 static void open_filters(struct slot_info *s)
481 {
482 struct audio_format_info *a = afi + s->format;
483 struct filter_node *fn;
484 int nf = a->num_filters;
485 struct btr_node *parent;
486 int i;
487
488 if (nf == 0)
489 return;
490 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
491 assert(s->fns == NULL);
492 s->fns = para_calloc(nf * sizeof(struct filter_node));
493 parent = s->receiver_node->btrn;
494 for (i = 0; i < nf; i++) {
495 struct filter *f = filters + a->filter_nums[i];
496 fn = s->fns + i;
497 fn->filter_num = a->filter_nums[i];
498 fn->conf = a->filter_conf[i];
499 fn->task.pre_select = f->pre_select;
500 fn->task.post_select = f->post_select;
501
502 fn->btrn = btr_new_node(&(struct btr_node_description)
503 EMBRACE(.name = f->name, .parent = parent,
504 .handler = f->execute, .context = fn));
505
506 f->open(fn);
507 register_task(&fn->task);
508 parent = fn->btrn;
509 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
510 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
511 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
512 }
513 }
514
515 static void open_writers(struct slot_info *s)
516 {
517 int i;
518 struct audio_format_info *a = afi + s->format;
519 struct writer_node *wn;
520 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
521
522 assert(s->wns == NULL);
523 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
524 * sizeof(struct writer_node));
525 if (a->num_writers == 0)
526 setup_writer_node(NULL, parent, s->wns);
527 else {
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);
534 }
535 }
536 }
537
538 /* returns slot num on success */
539 static int open_receiver(int format)
540 {
541 struct audio_format_info *a = &afi[format];
542 struct slot_info *s;
543 int ret, slot_num;
544 struct receiver *r = a->receiver;
545 struct receiver_node *rn;
546
547 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
548 ret = get_empty_slot();
549 if (ret < 0)
550 return ret;
551 slot_num = ret;
552 rn = para_calloc(sizeof(*rn));
553 rn->receiver = r;
554 rn->conf = a->receiver_conf;
555 rn->btrn = btr_new_node(&(struct btr_node_description)
556 EMBRACE(.name = r->name, .context = rn));
557 ret = r->open(rn);
558 if (ret < 0) {
559 btr_free_node(rn->btrn);
560 free(rn);
561 return ret;
562 }
563 s = &slot[slot_num];
564 s->format = format;
565 s->receiver_node = rn;
566 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
567 audio_formats[format], r->name, slot_num);
568 rn->task.pre_select = r->pre_select;
569 rn->task.post_select = r->post_select;
570 sprintf(rn->task.status, "%s receiver node", r->name);
571 register_task(&rn->task);
572 return slot_num;
573 }
574
575 static bool receiver_running(void)
576 {
577 int i;
578 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
579
580 FOR_EACH_SLOT(i) {
581 struct slot_info *s = &slot[i];
582 long unsigned ss2 = s->server_stream_start.tv_sec;
583
584 if (!s->receiver_node)
585 continue;
586 if (s->receiver_node->task.error >= 0)
587 return true;
588 if (ss1 == ss2)
589 return true;
590 }
591 return false;
592 }
593
594 /**
595 * Return the root node of the current buffer tree.
596 *
597 * This is only used for stream grabbing.
598 *
599 * \return \p NULL if no slot is currently active. If more than one buffer tree
600 * exists, the node corresponding to the most recently started receiver is
601 * returned.
602 */
603 struct btr_node *audiod_get_btr_root(void)
604 {
605 int i, newest_slot = -1;
606 struct timeval newest_rstime = {0, 0};
607
608 FOR_EACH_SLOT(i) {
609 struct slot_info *s = &slot[i];
610 struct timeval rstime;
611 if (!s->receiver_node)
612 continue;
613 if (s->receiver_node->task.error < 0)
614 continue;
615 btr_get_node_start(s->receiver_node->btrn, &rstime);
616 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
617 continue;
618 newest_rstime = rstime;
619 newest_slot = i;
620 }
621 if (newest_slot == -1)
622 return NULL;
623 return slot[newest_slot].receiver_node->btrn;
624 }
625
626 /* whether a new instance of a decoder should be started. */
627 static bool must_start_decoder(void)
628 {
629 int cafn = stat_task->current_audio_format_num;
630 unsigned vs = stat_task->vss_status;
631
632 if (audiod_status != AUDIOD_ON)
633 return false;
634 if (cafn < 0)
635 return false;
636 if (!stat_task->ct)
637 return false;
638 if (vs & VSS_STATUS_FLAG_NEXT)
639 return false;
640 if (!(vs & VSS_STATUS_FLAG_PLAYING))
641 return false;
642 if (receiver_running())
643 return false;
644 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
645 return false;
646 return true;
647 }
648
649 static unsigned compute_time_diff(const struct timeval *status_time)
650 {
651 struct timeval tmp, diff;
652 static unsigned count;
653 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
654 const struct timeval max_deviation = {0, 500 * 1000};
655 const int time_smooth = 5;
656
657 if (!status_time)
658 return count;
659 sign = tv_diff(status_time, now, &diff);
660 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
661 // sign, sa_time_diff_sign);
662 if (!count) {
663 sa_time_diff_sign = sign;
664 stat_task->sa_time_diff = diff;
665 count++;
666 goto out;
667 }
668 if (count > 5) {
669 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
670 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
671 PARA_WARNING_LOG("time diff jump: %lims\n",
672 s * tv2ms(&tmp));
673 }
674 count++;
675 sa_time_diff_sign = tv_convex_combination(
676 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
677 count > 10? sign : sign * time_smooth, &diff,
678 &tmp);
679 stat_task->sa_time_diff = tmp;
680 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
681 sign < 0? "-" : "+",
682 tv2ms(&diff),
683 sa_time_diff_sign < 0? "-" : "+",
684 tv2ms(&stat_task->sa_time_diff)
685 );
686 out:
687 stat_task->sa_time_diff_sign = sa_time_diff_sign;
688 return count;
689 }
690
691 static int update_item(int itemnum, char *buf)
692 {
693 long unsigned sec, usec;
694
695 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
696 return 1;
697 free(stat_item_values[itemnum]);
698 stat_item_values[itemnum] = para_strdup(buf);
699 stat_client_write_item(itemnum);
700 switch (itemnum) {
701 case SI_STATUS_FLAGS:
702 stat_task->vss_status = 0;
703 if (strchr(buf, 'N'))
704 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
705 if (strchr(buf, 'P'))
706 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
707 break;
708 case SI_OFFSET:
709 stat_task->offset_seconds = atoi(buf);
710 break;
711 case SI_SECONDS_TOTAL:
712 stat_task->length_seconds = atoi(buf);
713 break;
714 case SI_STREAM_START:
715 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
716 stat_task->server_stream_start.tv_sec = sec;
717 stat_task->server_stream_start.tv_usec = usec;
718 }
719 break;
720 case SI_CURRENT_TIME:
721 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
722 struct timeval tv = {sec, usec};
723 compute_time_diff(&tv);
724 }
725 break;
726 case SI_FORMAT:
727 stat_task->current_audio_format_num
728 = get_audio_format_num(buf);
729 }
730 return 1;
731 }
732
733 static int parse_stream_command(const char *txt, char **cmd)
734 {
735 int ret, len;
736 char *re, *p = strchr(txt, ':');
737
738 if (!p)
739 return -E_MISSING_COLON;
740 *cmd = p + 1;
741 len = p - txt;
742 re = malloc(len + 1);
743 strncpy(re, txt, len);
744 re[len] = '\0';
745 ret = get_matching_audio_format_nums(re);
746 free(re);
747 return ret;
748 }
749
750 static int add_filter(int format, char *cmdline)
751 {
752 struct audio_format_info *a = &afi[format];
753 int filter_num, nf = a->num_filters;
754 void *cfg;
755
756 filter_num = check_filter_arg(cmdline, &cfg);
757 if (filter_num < 0)
758 return filter_num;
759 a->filter_conf = para_realloc(a->filter_conf,
760 (nf + 1) * sizeof(void *));
761 a->filter_nums = para_realloc(a->filter_nums,
762 (nf + 1) * sizeof(unsigned));
763 a->filter_nums[nf] = filter_num;
764 a->filter_conf[nf] = cfg;
765 a->num_filters++;
766 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
767 filters[filter_num].name);
768 return filter_num;
769 }
770
771 static int parse_writer_args(void)
772 {
773 int i, ret;
774 char *cmd;
775 struct audio_format_info *a;
776
777 for (i = 0; i < conf.writer_given; i++) {
778 void *wconf;
779 int j, nw, writer_num, af_mask;
780
781 ret = parse_stream_command(conf.writer_arg[i], &cmd);
782 if (ret < 0)
783 goto out;
784 af_mask = ret;
785 FOR_EACH_AUDIO_FORMAT(j) {
786 a = afi + j;
787 if ((af_mask & (1 << j)) == 0) /* no match */
788 continue;
789 ret = -E_WRITE_COMMON_SYNTAX;
790 wconf = check_writer_arg(cmd, &writer_num);
791 if (!wconf)
792 goto out;
793 nw = a->num_writers;
794 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
795 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
796 a->writer_nums[nw] = writer_num;
797 a->writer_conf[nw] = wconf;
798 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[writer_num],
799 nw, writer_names[writer_num]);
800 a->num_writers++;
801 }
802 }
803 ret = 1;
804 out:
805 return ret;
806 }
807
808 static int parse_receiver_args(void)
809 {
810 int i, ret, receiver_num;
811 char *cmd = NULL;
812 struct audio_format_info *a;
813
814 for (i = conf.receiver_given - 1; i >= 0; i--) {
815 char *arg;
816 int j, af_mask;
817
818 ret = parse_stream_command(conf.receiver_arg[i], &arg);
819 if (ret < 0)
820 goto out;
821 af_mask = ret;
822 FOR_EACH_AUDIO_FORMAT(j) {
823 a = afi + j;
824 if ((af_mask & (1 << j)) == 0) /* no match */
825 continue;
826 /*
827 * If multiple receivers are given for this audio format, the
828 * last one wins and we have to free the previous receiver
829 * config here. Since we are iterating backwards, the winning
830 * receiver arg is in fact the first one given.
831 */
832 if (a->receiver_conf)
833 a->receiver->free_config(a->receiver_conf);
834 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
835 ret = -E_RECV_SYNTAX;
836 if (!a->receiver_conf)
837 goto out;
838 a->receiver = receivers + receiver_num;
839 }
840 }
841 /*
842 * Use the first available receiver with no arguments for those audio
843 * formats for which no receiver was specified.
844 */
845 cmd = para_strdup(receivers[0].name);
846 FOR_EACH_AUDIO_FORMAT(i) {
847 a = &afi[i];
848 if (a->receiver_conf)
849 continue;
850 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
851 if (!a->receiver_conf)
852 return -E_RECV_SYNTAX;
853 a->receiver = &receivers[receiver_num];
854 }
855 FOR_EACH_AUDIO_FORMAT(i) {
856 a = afi + i;
857 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
858 audio_formats[i], a->receiver->name);
859 }
860 ret = 1;
861 out:
862 free(cmd);
863 return ret;
864 }
865
866 static int init_default_filters(void)
867 {
868 int i, ret = 1;
869
870 FOR_EACH_AUDIO_FORMAT(i) {
871 struct audio_format_info *a = &afi[i];
872 char *tmp;
873 int j;
874
875 if (a->num_filters)
876 continue; /* no default -- nothing to to */
877 /*
878 * udp and dccp streams are fec-encoded, so add fecdec as the
879 * first filter.
880 */
881 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
882 strcmp(afi[i].receiver->name, "dccp") == 0) {
883 tmp = para_strdup("fecdec");
884 add_filter(i, tmp);
885 free(tmp);
886 if (ret < 0)
887 goto out;
888 }
889 /* add "dec" to audio format name */
890 tmp = make_message("%sdec", audio_formats[i]);
891 for (j = 0; filters[j].name; j++)
892 if (!strcmp(tmp, filters[j].name))
893 break;
894 free(tmp);
895 ret = -E_UNSUPPORTED_FILTER;
896 if (!filters[j].name)
897 goto out;
898 tmp = para_strdup(filters[j].name);
899 ret = add_filter(i, tmp);
900 free(tmp);
901 if (ret < 0)
902 goto out;
903 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
904 filters[j].name);
905 }
906 out:
907 return ret;
908 }
909
910 static int parse_filter_args(void)
911 {
912 int i, j, ret, af_mask;
913
914 if (!conf.no_default_filters_given)
915 return init_default_filters();
916 for (i = 0; i < conf.filter_given; i++) {
917 char *arg;
918 ret = parse_stream_command(conf.filter_arg[i], &arg);
919 if (ret < 0)
920 goto out;
921 af_mask = ret;
922 FOR_EACH_AUDIO_FORMAT(j) {
923 if ((af_mask & (1 << j)) == 0) /* no match */
924 continue;
925 ret = add_filter(j, arg);
926 if (ret < 0)
927 goto out;
928 }
929 }
930 ret = init_default_filters(); /* use default values for the rest */
931 out:
932 return ret;
933 }
934
935 static int parse_stream_args(void)
936 {
937 int ret;
938
939 ret = parse_receiver_args();
940 if (ret < 0)
941 return ret;
942 ret = parse_filter_args();
943 if (ret < 0)
944 return ret;
945 ret = parse_writer_args();
946 if (ret < 0)
947 return ret;
948 return 1;
949 }
950
951 /* does not unlink socket on errors */
952 static int audiod_get_socket(void)
953 {
954 struct sockaddr_un unix_addr;
955 int ret, fd;
956
957 if (conf.socket_given)
958 socket_name = para_strdup(conf.socket_arg);
959 else {
960 char *hn = para_hostname();
961 socket_name = make_message("/var/paraslash/audiod_socket.%s",
962 hn);
963 free(hn);
964 }
965 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
966 if (conf.force_given)
967 unlink(socket_name);
968 ret = create_local_socket(socket_name, &unix_addr,
969 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
970 if (ret < 0)
971 goto err;
972 fd = ret;
973 if (listen(fd , 5) < 0) {
974 ret = -ERRNO_TO_PARA_ERROR(errno);
975 goto err;
976 }
977 ret = mark_fd_nonblocking(fd);
978 if (ret < 0)
979 goto err;
980 return fd;
981 err:
982 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
983 exit(EXIT_FAILURE);
984 }
985
986 static void signal_pre_select(struct sched *s, struct task *t)
987 {
988 struct signal_task *st = container_of(t, struct signal_task, task);
989 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
990 }
991
992 static void signal_post_select(struct sched *s, __a_unused struct task *t)
993 {
994 int signum;
995
996 signum = para_next_signal(&s->rfds);
997 switch (signum) {
998 case SIGINT:
999 case SIGTERM:
1000 case SIGHUP:
1001 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1002 clean_exit(EXIT_FAILURE, "caught deadly signal");
1003 }
1004 }
1005
1006 static void signal_setup_default(struct signal_task *st)
1007 {
1008 st->task.pre_select = signal_pre_select;
1009 st->task.post_select = signal_post_select;
1010 sprintf(st->task.status, "signal task");
1011 }
1012
1013 static void command_pre_select(struct sched *s, struct task *t)
1014 {
1015 struct command_task *ct = container_of(t, struct command_task, task);
1016 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1017 }
1018
1019 static void command_post_select(struct sched *s, struct task *t)
1020 {
1021 int ret;
1022 struct command_task *ct = container_of(t, struct command_task, task);
1023 static struct timeval last_status_dump;
1024 struct timeval tmp, delay = {0, 500 * 1000};
1025
1026 tv_add(&last_status_dump, &delay, &tmp);
1027 if (tv_diff(&tmp, now, NULL) < 0) {
1028 audiod_status_dump();
1029 last_status_dump = *now;
1030 }
1031
1032 ret = handle_connect(ct->fd, &s->rfds);
1033 if (ret < 0)
1034 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1035 audiod_status_dump();
1036 }
1037
1038 static void init_command_task(struct command_task *ct)
1039 {
1040 ct->task.pre_select = command_pre_select;
1041 ct->task.post_select = command_post_select;
1042 ct->task.error = 0;
1043 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1044 sprintf(ct->task.status, "command task");
1045 }
1046
1047 static void close_stat_pipe(void)
1048 {
1049 if (!stat_task->ct)
1050 return;
1051 btr_free_node(stat_task->ct->btrn);
1052 client_close(stat_task->ct);
1053 stat_task->ct = NULL;
1054 clear_and_dump_items();
1055 stat_task->length_seconds = 0;
1056 stat_task->offset_seconds = 0;
1057 stat_task->vss_status = 0;
1058 stat_task->current_audio_format_num = -1;
1059 audiod_status_dump();
1060 }
1061
1062 /**
1063 * close the connection to para_server and exit
1064 *
1065 * \param status the exit status which is passed to exit(3)
1066 * \param msg the log message
1067 *
1068 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1069 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1070 * EXIT_FAILURE.
1071 *
1072 * \sa exit(3)
1073 */
1074 void __noreturn clean_exit(int status, const char *msg)
1075 {
1076 PARA_EMERG_LOG("%s\n", msg);
1077 if (socket_name)
1078 unlink(socket_name);
1079 close_stat_pipe();
1080 exit(status);
1081 }
1082
1083 /* avoid busy loop if server is down */
1084 static void set_stat_task_restart_barrier(unsigned seconds)
1085 {
1086 struct timeval delay = {seconds, 0};
1087 tv_add(now, &delay, &stat_task->restart_barrier);
1088 }
1089
1090 static void try_to_close_slot(int slot_num)
1091 {
1092 struct slot_info *s = &slot[slot_num];
1093 struct audio_format_info *a = afi + s->format;
1094 int i;
1095
1096 if (s->format < 0)
1097 return;
1098 if (s->receiver_node && s->receiver_node->task.error >= 0)
1099 return;
1100 for (i = 0; i < a->num_filters; i++)
1101 if (s->fns && s->fns[i].task.error >= 0)
1102 return;
1103 if (a->num_writers > 0) {
1104 for (i = 0; i < a->num_writers; i++)
1105 if (s->wns && s->wns[i].task.error >= 0)
1106 return;
1107 } else {
1108 if (s->wns && s->wns[0].task.error >= 0)
1109 return;
1110 }
1111 PARA_INFO_LOG("closing slot %d\n", slot_num);
1112 close_writers(s);
1113 close_filters(s);
1114 close_receiver(slot_num);
1115 clear_slot(slot_num);
1116 }
1117
1118 /*
1119 * Check if any receivers/filters/writers need to be started and do so if
1120 * necessary.
1121 */
1122 static void start_stop_decoders(void)
1123 {
1124 int i, ret;
1125 struct slot_info *sl;
1126 struct audio_format_info *a;
1127
1128 FOR_EACH_SLOT(i)
1129 try_to_close_slot(i);
1130 if (audiod_status != AUDIOD_ON ||
1131 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1132 return kill_all_decoders(-E_NOT_PLAYING);
1133 if (!must_start_decoder())
1134 return;
1135 ret = open_receiver(stat_task->current_audio_format_num);
1136 if (ret < 0) {
1137 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1138 return;
1139 }
1140 sl = slot + ret;
1141 a = afi + sl->format;
1142 if (a->num_filters)
1143 open_filters(sl);
1144 open_writers(sl);
1145 activate_grab_clients();
1146 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1147 }
1148
1149 static void status_pre_select(struct sched *s, struct task *t)
1150 {
1151 struct status_task *st = container_of(t, struct status_task, task);
1152 int ret, cafn = stat_task->current_audio_format_num;
1153
1154 if (must_start_decoder())
1155 goto min_delay;
1156 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1157 if (ret > 0)
1158 goto min_delay;
1159 if (st->ct && audiod_status == AUDIOD_OFF)
1160 goto min_delay;
1161 if (!st->ct && audiod_status != AUDIOD_OFF)
1162 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1163 if (cafn >= 0)
1164 sched_request_barrier(&afi[cafn].restart_barrier, s);
1165 /*
1166 * If para_server is playing we'd like to have a smooth time display
1167 * even if we are running in standby mode. So we request a timeout that
1168 * expires at the next full second.
1169 */
1170 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1171 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1172 return;
1173 min_delay:
1174 sched_min_delay(s);
1175 }
1176
1177 /* restart the client task if necessary */
1178 static void status_post_select(__a_unused struct sched *s, struct task *t)
1179 {
1180 struct status_task *st = container_of(t, struct status_task, task);
1181
1182 if (audiod_status == AUDIOD_OFF) {
1183 if (!st->ct)
1184 goto out;
1185 if (st->ct->task.error >= 0) {
1186 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1187 goto out;
1188 }
1189 if (st->ct->task.error >= 0)
1190 goto out;
1191 close_stat_pipe();
1192 st->clock_diff_count = conf.clock_diff_count_arg;
1193 goto out;
1194 }
1195 if (st->ct) {
1196 char *buf;
1197 size_t sz;
1198 int ret;
1199 if (st->ct->task.error < 0) {
1200 if (st->ct->task.error >= 0)
1201 goto out;
1202 close_stat_pipe();
1203 goto out;
1204 }
1205 if (st->ct->status != CL_RECEIVING)
1206 goto out;
1207 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1208 if (ret <= 0) {
1209 struct timeval diff;
1210 tv_diff(now, &st->last_status_read, &diff);
1211 if (diff.tv_sec > 61)
1212 kill_btrn(st->ct->btrn, &st->ct->task,
1213 -E_STATUS_TIMEOUT);
1214 goto out;
1215 }
1216 btr_merge(st->btrn, st->min_iqs);
1217 sz = btr_next_buffer(st->btrn, &buf);
1218 ret = for_each_stat_item(buf, sz, update_item);
1219 if (ret < 0) {
1220 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1221 goto out;
1222 }
1223 if (sz != ret) {
1224 btr_consume(st->btrn, sz - ret);
1225 st->last_status_read = *now;
1226 st->min_iqs = 0;
1227 } else /* current status item crosses buffers */
1228 st->min_iqs = sz + 1;
1229 goto out;
1230 }
1231 btr_drain(st->btrn);
1232 st->current_audio_format_num = -1;
1233 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1234 goto out;
1235 if (st->clock_diff_count) { /* get status only one time */
1236 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1237 int argc = 5;
1238 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1239 st->clock_diff_count--;
1240 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1241 set_stat_task_restart_barrier(2);
1242
1243 } else {
1244 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1245 int argc = 4;
1246 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1247 set_stat_task_restart_barrier(5);
1248 }
1249 free(stat_item_values[SI_BASENAME]);
1250 stat_item_values[SI_BASENAME] = para_strdup(
1251 "no connection to para_server");
1252 stat_client_write_item(SI_BASENAME);
1253 st->last_status_read = *now;
1254 out:
1255 start_stop_decoders();
1256 }
1257
1258 static void init_status_task(struct status_task *st)
1259 {
1260 memset(st, 0, sizeof(struct status_task));
1261 st->task.pre_select = status_pre_select;
1262 st->task.post_select = status_post_select;
1263 st->sa_time_diff_sign = 1;
1264 st->clock_diff_count = conf.clock_diff_count_arg;
1265 st->current_audio_format_num = -1;
1266 sprintf(st->task.status, "stat");
1267 st->btrn = btr_new_node(&(struct btr_node_description)
1268 EMBRACE(.name = "stat"));
1269 }
1270
1271 static void set_initial_status(void)
1272 {
1273 audiod_status = AUDIOD_ON;
1274 if (!conf.mode_given)
1275 return;
1276 if (!strcmp(conf.mode_arg, "sb")) {
1277 audiod_status = AUDIOD_STANDBY;
1278 return;
1279 }
1280 if (!strcmp(conf.mode_arg, "off")) {
1281 audiod_status = AUDIOD_OFF;
1282 return;
1283 }
1284 if (strcmp(conf.mode_arg, "on"))
1285 PARA_WARNING_LOG("invalid mode\n");
1286 }
1287
1288 __noreturn static void print_help_and_die(void)
1289 {
1290 int d = conf.detailed_help_given;
1291 const char **p = d? audiod_args_info_detailed_help
1292 : audiod_args_info_help;
1293
1294 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1295 AUDIOD_CMDLINE_PARSER_VERSION);
1296 printf_or_die("%s\n\n", audiod_args_info_usage);
1297 for (; *p; p++)
1298 printf_or_die("%s\n", *p);
1299 print_receiver_helps(d);
1300 print_filter_helps(d);
1301 print_writer_helps(d);
1302 exit(0);
1303 }
1304
1305 static void init_colors_or_die(void)
1306 {
1307 int i;
1308
1309 if (!want_colors())
1310 return;
1311 daemon_set_default_log_colors();
1312 daemon_set_flag(DF_COLOR_LOG);
1313 for (i = 0; i < conf.log_color_given; i++)
1314 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1315 }
1316
1317 /**
1318 * the main function of para_audiod
1319 *
1320 * \param argc usual argument count
1321 * \param argv usual argument vector
1322 *
1323 * \return EXIT_SUCCESS or EXIT_FAILURE
1324 *
1325 * \sa para_audiod(1)
1326 * */
1327 int main(int argc, char *argv[])
1328 {
1329 int ret, i;
1330 static struct sched s;
1331 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1332 struct audiod_cmdline_parser_params params = {
1333 .override = 0,
1334 .initialize = 1,
1335 .check_required = 0,
1336 .check_ambiguity = 0,
1337 .print_errors = 1
1338 };
1339
1340 valid_fd_012();
1341 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1342 exit(EXIT_FAILURE);
1343 HANDLE_VERSION_FLAG("audiod", conf);
1344 /* init receivers/filters/writers early to make help work */
1345 recv_init();
1346 filter_init();
1347 writer_init();
1348 if (conf.help_given || conf.detailed_help_given)
1349 print_help_and_die();
1350 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1351 parse_config_or_die();
1352 init_colors_or_die();
1353 init_random_seed_or_die();
1354 daemon_set_flag(DF_LOG_TIME);
1355 daemon_set_flag(DF_LOG_HOSTNAME);
1356 daemon_set_flag(DF_LOG_LL);
1357 if (conf.log_timing_given)
1358 daemon_set_flag(DF_LOG_TIMING);
1359 if (conf.logfile_given) {
1360 daemon_set_logfile(conf.logfile_arg);
1361 daemon_open_log_or_die();
1362 }
1363 ret = parse_stream_args();
1364 if (ret < 0) {
1365 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1366 exit(EXIT_FAILURE);
1367 }
1368 log_welcome("para_audiod");
1369 server_uptime(UPTIME_SET);
1370 set_initial_status();
1371 FOR_EACH_SLOT(i)
1372 clear_slot(i);
1373 setup_signal_handling();
1374 signal_setup_default(sig_task);
1375
1376 init_status_task(stat_task);
1377 init_command_task(cmd_task);
1378
1379 if (conf.daemon_given)
1380 daemonize();
1381
1382 register_task(&sig_task->task);
1383 register_task(&cmd_task->task);
1384 register_task(&stat_task->task);
1385 s.default_timeout.tv_sec = 2;
1386 s.default_timeout.tv_usec = 999 * 1000;
1387 ret = schedule(&s);
1388
1389 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1390 return EXIT_FAILURE;
1391 }