1f1f1aa666ffa0a63dfbd8bb72e591b264c3a20e
[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 char *p = strchr(txt, ':');
736 int i;
737
738 if (!p)
739 return -E_MISSING_COLON;
740 p++;
741 FOR_EACH_AUDIO_FORMAT(i) {
742 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
743 continue;
744 *cmd = p;
745 return i;
746 }
747 return -E_UNSUPPORTED_AUDIO_FORMAT;
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
755 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
756 if (filter_num < 0)
757 return filter_num;
758 a->filter_nums[nf] = filter_num;
759 a->num_filters++;
760 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
761 filters[filter_num].name);
762 return filter_num;
763 }
764
765 static int parse_writer_args(void)
766 {
767 int i, ret, nw;
768 char *cmd;
769 struct audio_format_info *a;
770
771 nw = PARA_MAX(1U, conf.writer_given);
772 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
773 FOR_EACH_AUDIO_FORMAT(i) {
774 a = &afi[i];
775 a->writer_conf = para_malloc(nw * sizeof(void *));
776 a->writer_nums = para_malloc(nw * sizeof(int));
777 a->num_writers = 0;
778 }
779 for (i = 0; i < conf.writer_given; i++) {
780 void *wconf;
781 int writer_num;
782 ret = parse_stream_command(conf.writer_arg[i], &cmd);
783 if (ret < 0)
784 goto out;
785 a = &afi[ret];
786 nw = a->num_writers;
787 wconf = check_writer_arg(cmd, &writer_num);
788 if (!wconf) {
789 ret = writer_num;
790 goto out;
791 }
792 a->writer_nums[nw] = writer_num;
793 a->writer_conf[nw] = wconf;
794 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
795 nw, writer_names[writer_num]);
796 a->num_writers++;
797 }
798 ret = 1;
799 out:
800 return ret;
801 }
802
803 static int parse_receiver_args(void)
804 {
805 int i, ret, receiver_num;
806 char *cmd = NULL;
807 struct audio_format_info *a;
808
809 for (i = conf.receiver_given - 1; i >= 0; i--) {
810 char *arg = conf.receiver_arg[i];
811 char *recv_arg = strchr(arg, ':');
812 int af_mask, j;
813
814 ret = -E_MISSING_COLON;
815 if (!recv_arg)
816 goto out;
817 *recv_arg = '\0';
818 recv_arg++;
819 ret = get_matching_audio_format_nums(arg);
820 if (ret < 0)
821 goto out;
822 af_mask = ret;
823 FOR_EACH_AUDIO_FORMAT(j) {
824 a = afi + j;
825 if ((af_mask & (1 << j)) == 0) /* no match */
826 continue;
827 /*
828 * If multiple receivers are given for this audio format, the
829 * last one wins and we have to free the previous receiver
830 * config here. Since we are iterating backwards, the winning
831 * receiver arg is in fact the first one given.
832 */
833 if (a->receiver_conf)
834 a->receiver->free_config(a->receiver_conf);
835 a->receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
836 ret = -E_RECV_SYNTAX;
837 if (!a->receiver_conf)
838 goto out;
839 a->receiver = receivers + receiver_num;
840 }
841 }
842 /*
843 * Use the first available receiver with no arguments for those audio
844 * formats for which no receiver was specified.
845 */
846 cmd = para_strdup(receivers[0].name);
847 FOR_EACH_AUDIO_FORMAT(i) {
848 a = &afi[i];
849 if (a->receiver_conf)
850 continue;
851 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
852 if (!a->receiver_conf)
853 return -E_RECV_SYNTAX;
854 a->receiver = &receivers[receiver_num];
855 }
856 FOR_EACH_AUDIO_FORMAT(i) {
857 a = afi + i;
858 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
859 audio_formats[i], a->receiver->name);
860 }
861 ret = 1;
862 out:
863 free(cmd);
864 return ret;
865 }
866
867 static int init_default_filters(void)
868 {
869 int i, ret = 1;
870
871 FOR_EACH_AUDIO_FORMAT(i) {
872 struct audio_format_info *a = &afi[i];
873 char *tmp;
874 int j;
875
876 if (a->num_filters)
877 continue; /* no default -- nothing to to */
878 /*
879 * If udp is used to receive this audiod format, add fecdec as
880 * the first filter.
881 */
882 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
883 strcmp(afi[i].receiver->name, "dccp") == 0) {
884 tmp = para_strdup("fecdec");
885 add_filter(i, tmp);
886 free(tmp);
887 if (ret < 0)
888 goto out;
889 }
890 /* add "dec" to audio format name */
891 tmp = make_message("%sdec", audio_formats[i]);
892 for (j = 0; filters[j].name; j++)
893 if (!strcmp(tmp, filters[j].name))
894 break;
895 free(tmp);
896 ret = -E_UNSUPPORTED_FILTER;
897 if (!filters[j].name)
898 goto out;
899 tmp = para_strdup(filters[j].name);
900 ret = add_filter(i, tmp);
901 free(tmp);
902 if (ret < 0)
903 goto out;
904 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
905 filters[j].name);
906 }
907 out:
908 return ret;
909 }
910
911 static int parse_filter_args(void)
912 {
913 int i, ret, nf;
914
915 nf = PARA_MAX(2U, conf.filter_given);
916 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
917 FOR_EACH_AUDIO_FORMAT(i) {
918 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
919 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
920 }
921 if (!conf.no_default_filters_given)
922 return init_default_filters();
923 for (i = 0; i < conf.filter_given; i++) {
924 char *arg = conf.filter_arg[i];
925 char *filter_name = strchr(arg, ':');
926 ret = -E_MISSING_COLON;
927 if (!filter_name)
928 goto out;
929 *filter_name = '\0';
930 filter_name++;
931 ret = get_audio_format_num(arg);
932 if (ret < 0)
933 goto out;
934 ret = add_filter(ret, filter_name);
935 if (ret < 0)
936 goto out;
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 btr_free_node(stat_task->ct->btrn);
1060 client_close(stat_task->ct);
1061 stat_task->ct = NULL;
1062 clear_and_dump_items();
1063 stat_task->length_seconds = 0;
1064 stat_task->offset_seconds = 0;
1065 stat_task->vss_status = 0;
1066 stat_task->current_audio_format_num = -1;
1067 audiod_status_dump();
1068 }
1069
1070 /**
1071 * close the connection to para_server and exit
1072 *
1073 * \param status the exit status which is passed to exit(3)
1074 * \param msg the log message
1075 *
1076 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1077 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1078 * EXIT_FAILURE.
1079 *
1080 * \sa exit(3)
1081 */
1082 void __noreturn clean_exit(int status, const char *msg)
1083 {
1084 PARA_EMERG_LOG("%s\n", msg);
1085 if (socket_name)
1086 unlink(socket_name);
1087 close_stat_pipe();
1088 exit(status);
1089 }
1090
1091 /* avoid busy loop if server is down */
1092 static void set_stat_task_restart_barrier(unsigned seconds)
1093 {
1094 struct timeval delay = {seconds, 0};
1095 tv_add(now, &delay, &stat_task->restart_barrier);
1096 }
1097
1098 static void try_to_close_slot(int slot_num)
1099 {
1100 struct slot_info *s = &slot[slot_num];
1101 struct audio_format_info *a = afi + s->format;
1102 int i;
1103
1104 if (s->format < 0)
1105 return;
1106 if (s->receiver_node && s->receiver_node->task.error >= 0)
1107 return;
1108 for (i = 0; i < a->num_filters; i++)
1109 if (s->fns && s->fns[i].task.error >= 0)
1110 return;
1111 if (a->num_writers > 0) {
1112 for (i = 0; i < a->num_writers; i++)
1113 if (s->wns && s->wns[i].task.error >= 0)
1114 return;
1115 } else {
1116 if (s->wns && s->wns[0].task.error >= 0)
1117 return;
1118 }
1119 PARA_INFO_LOG("closing slot %d\n", slot_num);
1120 close_writers(s);
1121 close_filters(s);
1122 close_receiver(slot_num);
1123 clear_slot(slot_num);
1124 }
1125
1126 /*
1127 * Check if any receivers/filters/writers need to be started and do so if
1128 * necessary.
1129 */
1130 static void start_stop_decoders(void)
1131 {
1132 int i, ret;
1133 struct slot_info *sl;
1134 struct audio_format_info *a;
1135
1136 FOR_EACH_SLOT(i)
1137 try_to_close_slot(i);
1138 if (audiod_status != AUDIOD_ON ||
1139 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1140 return kill_all_decoders(-E_NOT_PLAYING);
1141 if (!must_start_decoder())
1142 return;
1143 ret = open_receiver(stat_task->current_audio_format_num);
1144 if (ret < 0) {
1145 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1146 return;
1147 }
1148 sl = slot + ret;
1149 a = afi + sl->format;
1150 if (a->num_filters)
1151 open_filters(sl);
1152 open_writers(sl);
1153 activate_grab_clients();
1154 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1155 }
1156
1157 static void status_pre_select(struct sched *s, struct task *t)
1158 {
1159 struct status_task *st = container_of(t, struct status_task, task);
1160 int ret, cafn = stat_task->current_audio_format_num;
1161
1162 if (must_start_decoder())
1163 goto min_delay;
1164 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1165 if (ret > 0)
1166 goto min_delay;
1167 if (st->ct && audiod_status == AUDIOD_OFF)
1168 goto min_delay;
1169 if (!st->ct && audiod_status != AUDIOD_OFF)
1170 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1171 if (cafn >= 0)
1172 sched_request_barrier(&afi[cafn].restart_barrier, s);
1173 /*
1174 * If para_server is playing we'd like to have a smooth time display
1175 * even if we are running in standby mode. So we request a timeout that
1176 * expires at the next full second.
1177 */
1178 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1179 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1180 return;
1181 min_delay:
1182 sched_min_delay(s);
1183 }
1184
1185 /* restart the client task if necessary */
1186 static void status_post_select(__a_unused struct sched *s, struct task *t)
1187 {
1188 struct status_task *st = container_of(t, struct status_task, task);
1189
1190 if (audiod_status == AUDIOD_OFF) {
1191 if (!st->ct)
1192 goto out;
1193 if (st->ct->task.error >= 0) {
1194 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1195 goto out;
1196 }
1197 if (st->ct->task.error >= 0)
1198 goto out;
1199 close_stat_pipe();
1200 st->clock_diff_count = conf.clock_diff_count_arg;
1201 goto out;
1202 }
1203 if (st->ct) {
1204 char *buf;
1205 size_t sz;
1206 int ret;
1207 if (st->ct->task.error < 0) {
1208 if (st->ct->task.error >= 0)
1209 goto out;
1210 close_stat_pipe();
1211 goto out;
1212 }
1213 if (st->ct->status != CL_RECEIVING)
1214 goto out;
1215 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1216 if (ret <= 0) {
1217 struct timeval diff;
1218 tv_diff(now, &st->last_status_read, &diff);
1219 if (diff.tv_sec > 61)
1220 kill_btrn(st->ct->btrn, &st->ct->task,
1221 -E_STATUS_TIMEOUT);
1222 goto out;
1223 }
1224 btr_merge(st->btrn, st->min_iqs);
1225 sz = btr_next_buffer(st->btrn, &buf);
1226 ret = for_each_stat_item(buf, sz, update_item);
1227 if (ret < 0) {
1228 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1229 goto out;
1230 }
1231 if (sz != ret) {
1232 btr_consume(st->btrn, sz - ret);
1233 st->last_status_read = *now;
1234 st->min_iqs = 0;
1235 } else /* current status item crosses buffers */
1236 st->min_iqs = sz + 1;
1237 goto out;
1238 }
1239 btr_drain(st->btrn);
1240 st->current_audio_format_num = -1;
1241 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1242 goto out;
1243 if (st->clock_diff_count) { /* get status only one time */
1244 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1245 int argc = 5;
1246 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1247 st->clock_diff_count--;
1248 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1249 set_stat_task_restart_barrier(2);
1250
1251 } else {
1252 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1253 int argc = 4;
1254 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1255 set_stat_task_restart_barrier(5);
1256 }
1257 free(stat_item_values[SI_BASENAME]);
1258 stat_item_values[SI_BASENAME] = para_strdup(
1259 "no connection to para_server");
1260 stat_client_write_item(SI_BASENAME);
1261 st->last_status_read = *now;
1262 out:
1263 start_stop_decoders();
1264 }
1265
1266 static void init_status_task(struct status_task *st)
1267 {
1268 memset(st, 0, sizeof(struct status_task));
1269 st->task.pre_select = status_pre_select;
1270 st->task.post_select = status_post_select;
1271 st->sa_time_diff_sign = 1;
1272 st->clock_diff_count = conf.clock_diff_count_arg;
1273 st->current_audio_format_num = -1;
1274 sprintf(st->task.status, "stat");
1275 st->btrn = btr_new_node(&(struct btr_node_description)
1276 EMBRACE(.name = "stat"));
1277 }
1278
1279 static void set_initial_status(void)
1280 {
1281 audiod_status = AUDIOD_ON;
1282 if (!conf.mode_given)
1283 return;
1284 if (!strcmp(conf.mode_arg, "sb")) {
1285 audiod_status = AUDIOD_STANDBY;
1286 return;
1287 }
1288 if (!strcmp(conf.mode_arg, "off")) {
1289 audiod_status = AUDIOD_OFF;
1290 return;
1291 }
1292 if (strcmp(conf.mode_arg, "on"))
1293 PARA_WARNING_LOG("invalid mode\n");
1294 }
1295
1296 __noreturn static void print_help_and_die(void)
1297 {
1298 int d = conf.detailed_help_given;
1299 const char **p = d? audiod_args_info_detailed_help
1300 : audiod_args_info_help;
1301
1302 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1303 AUDIOD_CMDLINE_PARSER_VERSION);
1304 printf_or_die("%s\n\n", audiod_args_info_usage);
1305 for (; *p; p++)
1306 printf_or_die("%s\n", *p);
1307 print_receiver_helps(d);
1308 print_filter_helps(d);
1309 print_writer_helps(d);
1310 exit(0);
1311 }
1312
1313 static void init_colors_or_die(void)
1314 {
1315 int i;
1316
1317 if (!want_colors())
1318 return;
1319 daemon_set_default_log_colors();
1320 daemon_set_flag(DF_COLOR_LOG);
1321 for (i = 0; i < conf.log_color_given; i++)
1322 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1323 }
1324
1325 /**
1326 * the main function of para_audiod
1327 *
1328 * \param argc usual argument count
1329 * \param argv usual argument vector
1330 *
1331 * \return EXIT_SUCCESS or EXIT_FAILURE
1332 *
1333 * \sa para_audiod(1)
1334 * */
1335 int main(int argc, char *argv[])
1336 {
1337 int ret, i;
1338 static struct sched s;
1339 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1340 struct audiod_cmdline_parser_params params = {
1341 .override = 0,
1342 .initialize = 1,
1343 .check_required = 0,
1344 .check_ambiguity = 0,
1345 .print_errors = 1
1346 };
1347
1348 valid_fd_012();
1349 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1350 exit(EXIT_FAILURE);
1351 HANDLE_VERSION_FLAG("audiod", conf);
1352 /* init receivers/filters/writers early to make help work */
1353 recv_init();
1354 filter_init();
1355 writer_init();
1356 if (conf.help_given || conf.detailed_help_given)
1357 print_help_and_die();
1358 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1359 parse_config_or_die();
1360 init_colors_or_die();
1361 init_random_seed_or_die();
1362 daemon_set_flag(DF_LOG_TIME);
1363 daemon_set_flag(DF_LOG_HOSTNAME);
1364 daemon_set_flag(DF_LOG_LL);
1365 if (conf.log_timing_given)
1366 daemon_set_flag(DF_LOG_TIMING);
1367 if (conf.logfile_given) {
1368 daemon_set_logfile(conf.logfile_arg);
1369 daemon_open_log_or_die();
1370 }
1371 ret = parse_stream_args();
1372 if (ret < 0) {
1373 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1374 exit(EXIT_FAILURE);
1375 }
1376 log_welcome("para_audiod");
1377 server_uptime(UPTIME_SET);
1378 set_initial_status();
1379 FOR_EACH_SLOT(i)
1380 clear_slot(i);
1381 setup_signal_handling();
1382 signal_setup_default(sig_task);
1383
1384 init_status_task(stat_task);
1385 init_command_task(cmd_task);
1386
1387 if (conf.daemon_given)
1388 daemonize();
1389
1390 register_task(&sig_task->task);
1391 register_task(&cmd_task->task);
1392 register_task(&stat_task->task);
1393 s.default_timeout.tv_sec = 2;
1394 s.default_timeout.tv_usec = 999 * 1000;
1395 ret = schedule(&s);
1396
1397 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1398 return EXIT_FAILURE;
1399 }