dccp: sort out help text
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c the paraslash's audio daemon */
8 #include <regex.h>
9 #include <sys/types.h>
10 #include <dirent.h>
11 #include <signal.h>
12 #include <openssl/rc4.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "error.h"
17 #include "crypt.h"
18 #include "audiod.cmdline.h"
19 #include "list.h"
20 #include "sched.h"
21 #include "ggo.h"
22 #include "recv.h"
23 #include "buffer_tree.h"
24 #include "filter.h"
25 #include "grab_client.h"
26 #include "client.cmdline.h"
27 #include "client.h"
28 #include "audiod.h"
29 #include "net.h"
30 #include "daemon.h"
31 #include "string.h"
32 #include "fd.h"
33 #include "write.h"
34 #include "write_common.h"
35 #include "signal.h"
36
37 /** define the array of error lists needed by para_audiod */
38 INIT_AUDIOD_ERRLISTS;
39 /** define the array containing all supported audio formats */
40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
41
42 /** Defines how audiod handles one supported audio format. */
43 struct audio_format_info {
44 /** pointer to the receiver for this audio format */
45 struct receiver *receiver;
46 /** the receiver configuration */
47 void *receiver_conf;
48 /** the number of filters that should be activated for this audio format */
49 unsigned int num_filters;
50 /** Array of filter numbers to be activated. */
51 unsigned *filter_nums;
52 /** Pointer to the array of filter configurations. */
53 void **filter_conf;
54 /** the number of filters that should be activated for this audio format */
55 unsigned int num_writers;
56 /** Array of writer numbers to be activated. */
57 int *writer_nums;
58 /** pointer to the array of writer configurations */
59 void **writer_conf;
60 /** do not start receiver/filters/writer before this time */
61 struct timeval restart_barrier;
62 };
63
64 /**
65 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
66 * be associated with a receiver/filter/writer triple. This array holds all
67 * information on the status of these slots.
68 *
69 * \sa struct slot_info
70 * */
71 struct slot_info slot[MAX_STREAM_SLOTS];
72
73 /** The vss status flags audiod is interested in. */
74 enum vss_status_flags {
75 /** Whether the 'N' flag is set. */
76 VSS_STATUS_FLAG_NEXT = 1,
77 /** The 'P' flag is set. */
78 VSS_STATUS_FLAG_PLAYING = 2,
79 };
80
81 /**
82 * The task for obtaining para_server's status (para_client stat).
83 *
84 * \sa struct task, struct sched.
85 */
86 struct status_task {
87 /** The associated task structure of audiod. */
88 struct task task;
89 /** Client data associated with the stat task. */
90 struct client_task *ct;
91 /** Do not restart client command until this time. */
92 struct timeval restart_barrier;
93 /** Last time we received status data from para_server. */
94 struct timeval last_status_read;
95 /** The offset value announced by para_server. */
96 int offset_seconds;
97 /** The length of the current audio file as announced by para_server. */
98 int length_seconds;
99 /** The start of the current stream from the view of para_server. */
100 struct timeval server_stream_start;
101 /** The average time deviation between para_server and para_audiod. */
102 struct timeval sa_time_diff;
103 /** Whether client time is ahead of server time. */
104 int sa_time_diff_sign;
105 /** The 'P' and the 'N' flags as announced by para_server. */
106 enum vss_status_flags vss_status;
107 /** Number of times the clock difference is to be checked. */
108 unsigned clock_diff_count;
109 /** When to start the next check for clock difference. */
110 struct timeval clock_diff_barrier;
111 /** Number of the audio format as announced by para_server. */
112 int current_audio_format_num;
113 /* The status task btrn is the child of the client task. */
114 struct btr_node *btrn;
115 };
116
117 /** The array of status items sent by para_server. */
118 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
119
120 /**
121 * the current mode of operation of which can be changed by the on/off/cycle
122 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
123 */
124 int audiod_status = AUDIOD_ON;
125
126 /**
127 * the gengetopt args_info struct that holds information on all command line
128 * arguments
129 */
130 struct audiod_args_info conf;
131
132 static char *socket_name;
133 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
134
135 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
136
137 static struct status_task status_task_struct;
138
139 /**
140 * the task that calls the status command of para_server
141 *
142 * \sa struct status_task
143 */
144 static struct status_task *stat_task = &status_task_struct;
145 static struct timeval initial_delay_barrier;
146
147 /**
148 * the task for handling audiod commands
149 *
150 * \sa struct task, struct sched
151 */
152 struct command_task {
153 /** the local listening socket */
154 int fd;
155 /** the associated task structure */
156 struct task task;
157 };
158
159 /** iterate over all supported audio formats */
160 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
161
162 /**
163 * Get the audio format number.
164 *
165 * \param name The name of the audio format.
166 *
167 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
168 * \a name is not a supported audio format.
169 */
170 int get_audio_format_num(const char *name)
171 {
172 int i;
173
174 while (para_isspace(*name))
175 name++;
176 FOR_EACH_AUDIO_FORMAT(i)
177 if (!strcmp(name, audio_formats[i]))
178 return i;
179 return -E_UNSUPPORTED_AUDIO_FORMAT;
180 }
181
182 /**
183 * Compute the play time based on information of the given slot.
184 *
185 * \param slot_num The slot number (negative means: no slot).
186 *
187 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
188 * from the status items received from para_server and the start time of the
189 * (first) writer of the given slot.
190 *
191 * It has to to take into account that probably the stream was not started at
192 * the beginning of the file, that the clock between the server and the client
193 * host may differ and that playback of the stream was delayed, e.g. because
194 * the prebuffer filter is used in the filter chain of the given slot.
195 *
196 * If no writer is active in the given slot, or \a slot_num is negative
197 * (indicating that para_audiod runs in standby mode), an approximation based
198 * only on the status items is computed and the returned string is prefixed
199 * with "~".
200 *
201 * \return A string that must be freed by the caller.
202 */
203 char *get_time_string(int slot_num)
204 {
205 int ret, seconds = 0, length;
206 struct timeval *tmp, sum, sss, /* server stream start */
207 rstime, /* receiver start time */
208 wstime, /* writer start time */
209 wtime, /* now - writer start */
210 rskip; /* receiver start - sss */
211 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
212 char *msg;
213
214 if (audiod_status == AUDIOD_OFF)
215 goto empty;
216 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
217 if (stat_task->length_seconds) /* paused */
218 return NULL;
219 goto empty; /* stopped */
220 }
221 if (audiod_status == AUDIOD_ON && !s)
222 goto empty;
223 /*
224 * Valid status items and playing, set length and tmp to the stream
225 * start. We use the slot info and fall back to the info from current
226 * status items if no slot info is available.
227 */
228 length = stat_task->length_seconds;
229 tmp = &stat_task->server_stream_start;
230 if (s && s->wns) { /* writer active in this slot */
231 btr_get_node_start(s->wns[0].btrn, &wstime);
232 if (wstime.tv_sec != 0) { /* writer wrote something */
233 if (s->server_stream_start.tv_sec == 0) {
234 /* copy status info to slot */
235 s->server_stream_start = stat_task->server_stream_start;
236 s->offset_seconds = stat_task->offset_seconds;
237 s->seconds_total = stat_task->length_seconds;
238 }
239 length = s->seconds_total;
240 tmp = &s->server_stream_start;
241 }
242 }
243 if (stat_task->sa_time_diff_sign > 0)
244 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
245 else
246 tv_add(tmp, &stat_task->sa_time_diff, &sss);
247 if (!s || !s->wns) {
248 struct timeval diff;
249 tv_diff(now, &sss, &diff);
250 seconds = diff.tv_sec + stat_task->offset_seconds;
251 goto out;
252 }
253 tv_diff(now, &wstime, &wtime);
254 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
255 seconds = s->offset_seconds;
256 btr_get_node_start(s->receiver_node->btrn, &rstime);
257 ret = tv_diff(&rstime, &sss, &rskip);
258 if (ret > 0) { /* audiod was started in the middle of the stream */
259 tv_add(&wtime, &rskip, &sum);
260 seconds += sum.tv_sec;
261 } else
262 seconds += wtime.tv_sec;
263 out:
264 seconds = PARA_MIN(seconds, length);
265 seconds = PARA_MAX(seconds, 0);
266 msg = make_message(
267 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
268 s? "" : "~",
269 seconds / 60,
270 seconds % 60,
271 (length - seconds) / 60,
272 (length - seconds) % 60,
273 length? (seconds * 100 + length / 2) / length : 0,
274 length / 60,
275 length % 60
276 );
277 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
278 return msg;
279 empty:
280 return para_strdup(NULL);
281 }
282
283 static int want_colors(void)
284 {
285 if (conf.color_arg == color_arg_no)
286 return 0;
287 if (conf.color_arg == color_arg_yes)
288 return 1;
289 if (conf.logfile_given)
290 return 0;
291 return isatty(STDERR_FILENO);
292 }
293
294 static void parse_config_or_die(void)
295 {
296 int ret;
297 char *config_file;
298 struct audiod_cmdline_parser_params params = {
299 .override = 0,
300 .initialize = 0,
301 .check_required = 1,
302 .check_ambiguity = 0,
303 .print_errors = 1
304 };
305
306 if (conf.config_file_given)
307 config_file = para_strdup(conf.config_file_arg);
308 else {
309 char *home = para_homedir();
310 config_file = make_message("%s/.paraslash/audiod.conf", home);
311 free(home);
312 }
313 ret = file_exists(config_file);
314 if (conf.config_file_given && !ret) {
315 PARA_EMERG_LOG("can not read config file %s\n", config_file);
316 goto err;
317 }
318 if (ret)
319 audiod_cmdline_parser_config_file(config_file, &conf, &params);
320 free(config_file);
321 daemon_set_loglevel(conf.loglevel_arg);
322 return;
323 err:
324 free(config_file);
325 exit(EXIT_FAILURE);
326 }
327
328 static void setup_signal_handling(void)
329 {
330 sig_task->fd = para_signal_init();
331 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
332 para_install_sighandler(SIGINT);
333 para_install_sighandler(SIGTERM);
334 para_install_sighandler(SIGHUP);
335 para_sigaction(SIGPIPE, SIG_IGN);
336 }
337
338 static void clear_slot(int slot_num)
339 {
340 struct slot_info *s = &slot[slot_num];
341
342 PARA_INFO_LOG("clearing slot %d\n", slot_num);
343 memset(s, 0, sizeof(struct slot_info));
344 s->format = -1;
345 }
346
347 static void close_receiver(int slot_num)
348 {
349 struct slot_info *s = &slot[slot_num];
350 struct audio_format_info *a;
351 struct timeval restart_delay = {0, 200 * 1000};
352
353 if (s->format < 0 || !s->receiver_node)
354 return;
355 a = &afi[s->format];
356 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
357 audio_formats[s->format], slot_num);
358 a->receiver->close(s->receiver_node);
359 btr_free_node(s->receiver_node->btrn);
360 free(s->receiver_node);
361 s->receiver_node = NULL;
362 tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
363 }
364
365 static void writer_cleanup(struct writer_node *wn)
366 {
367 struct writer *w;
368
369 if (!wn)
370 return;
371 w = writers + wn->writer_num;
372 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
373 w->close(wn);
374 btr_free_node(wn->btrn);
375 }
376
377 static void close_writers(struct slot_info *s)
378 {
379 struct audio_format_info *a;
380 int i;
381
382 if (s->format < 0)
383 return;
384 assert(s->wns);
385 a = afi + s->format;
386 if (a->num_writers == 0)
387 writer_cleanup(s->wns);
388 else {
389 for (i = 0; i < a->num_writers; i++)
390 writer_cleanup(s->wns + i);
391 }
392 free(s->wns);
393 s->wns = NULL;
394 }
395
396 static void close_filters(struct slot_info *s)
397 {
398 int i;
399 struct audio_format_info *a = afi + s->format;
400 if (a->num_filters == 0)
401 return;
402 for (i = 0; i < a->num_filters; i++) {
403 struct filter_node *fn = s->fns + i;
404 struct filter *f;
405
406 if (!fn)
407 continue;
408 f = filters + fn->filter_num;
409 if (f->close)
410 f->close(fn);
411 btr_free_node(fn->btrn);
412 }
413 free(s->fns);
414 s->fns = NULL;
415 }
416
417 /*
418 * Whenever a task commits suicide by returning from post_select with t->error
419 * < 0, it also removes its btr node. We do exactly that to kill a running
420 * task. Note that the scheduler checks t->error also _before_ each pre/post
421 * select call, so the victim will never be scheduled again.
422 */
423 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
424 {
425 if (t->error < 0)
426 return;
427 t->error = error;
428 btr_remove_node(btrn);
429 }
430
431 static void kill_all_decoders(int error)
432 {
433 int i, j;
434
435 FOR_EACH_SLOT(i) {
436 struct slot_info *s = &slot[i];
437 struct audio_format_info *a;
438 if (s->format < 0)
439 continue;
440 a = afi + s->format;
441 if (s->wns)
442 for (j = 0; j < a->num_writers; j++)
443 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
444 if (s->fns)
445 for (j = 0; j < a->num_writers; j++)
446 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
447 if (s->receiver_node)
448 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
449 error);
450 }
451 }
452
453 static int get_empty_slot(void)
454 {
455 int i;
456 struct slot_info *s;
457
458 FOR_EACH_SLOT(i) {
459 s = &slot[i];
460 if (s->format < 0) {
461 clear_slot(i);
462 return i;
463 }
464 if (s->wns || s->receiver_node || s->fns)
465 continue;
466 clear_slot(i);
467 return i;
468 }
469 return -E_NO_MORE_SLOTS;
470 }
471
472 /**
473 * get the number of filters
474 *
475 * \param audio_format_num the number identifying the audio format
476 *
477 * \return the number of filters for the given audio format
478 *
479 * \sa struct filter;
480 */
481 int num_filters(int audio_format_num)
482 {
483 return afi[audio_format_num].num_filters;
484 }
485
486 static void open_filters(struct slot_info *s)
487 {
488 struct audio_format_info *a = afi + s->format;
489 struct filter_node *fn;
490 int nf = a->num_filters;
491 struct btr_node *parent;
492 int i;
493
494 if (nf == 0)
495 return;
496 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
497 assert(s->fns == NULL);
498 s->fns = para_calloc(nf * sizeof(struct filter_node));
499 parent = s->receiver_node->btrn;
500 for (i = 0; i < nf; i++) {
501 struct filter *f = filters + a->filter_nums[i];
502 fn = s->fns + i;
503 fn->filter_num = a->filter_nums[i];
504 fn->conf = a->filter_conf[i];
505 fn->task.pre_select = f->pre_select;
506 fn->task.post_select = f->post_select;
507
508 fn->btrn = btr_new_node(&(struct btr_node_description)
509 EMBRACE(.name = f->name, .parent = parent,
510 .handler = f->execute, .context = fn));
511
512 f->open(fn);
513 register_task(&fn->task);
514 parent = fn->btrn;
515 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
516 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
517 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
518 }
519 }
520
521 static void open_writers(struct slot_info *s)
522 {
523 int i;
524 struct audio_format_info *a = afi + s->format;
525 struct writer_node *wn;
526 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
527
528 assert(s->wns == NULL);
529 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
530 * sizeof(struct writer_node));
531 if (a->num_writers == 0)
532 setup_writer_node(NULL, parent, s->wns);
533 else {
534 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
535 for (i = 0; i < a->num_writers; i++) {
536 wn = s->wns + i;
537 wn->conf = a->writer_conf[i];
538 wn->writer_num = a->writer_nums[i];
539 register_writer_node(wn, parent);
540 }
541 }
542 }
543
544 /* returns slot num on success */
545 static int open_receiver(int format)
546 {
547 struct audio_format_info *a = &afi[format];
548 struct slot_info *s;
549 int ret, slot_num;
550 struct receiver *r = a->receiver;
551 struct receiver_node *rn;
552
553 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
554 ret = get_empty_slot();
555 if (ret < 0)
556 return ret;
557 slot_num = ret;
558 rn = para_calloc(sizeof(*rn));
559 rn->receiver = r;
560 rn->conf = a->receiver_conf;
561 rn->btrn = btr_new_node(&(struct btr_node_description)
562 EMBRACE(.name = r->name, .context = rn));
563 ret = r->open(rn);
564 if (ret < 0) {
565 btr_free_node(rn->btrn);
566 free(rn);
567 return ret;
568 }
569 s = &slot[slot_num];
570 s->format = format;
571 s->receiver_node = rn;
572 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
573 audio_formats[format], r->name, slot_num);
574 rn->task.pre_select = r->pre_select;
575 rn->task.post_select = r->post_select;
576 sprintf(rn->task.status, "%s receiver node", r->name);
577 register_task(&rn->task);
578 return slot_num;
579 }
580
581 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
582 static int receiver_running(int format)
583 {
584 int i, ret = 0;
585
586 FOR_EACH_SLOT(i) {
587 struct slot_info *s = &slot[i];
588 if (s->format != format)
589 continue;
590 if (!s->receiver_node)
591 continue;
592 if (s->receiver_node->task.error >= 0)
593 return 1;
594 ret = -1;
595 }
596 return ret;
597 }
598
599 /**
600 * Return the root node of the current buffer tree.
601 *
602 * This is only used for stream grabbing.
603 *
604 * \return \p NULL if no slot is currently active. If more than one buffer tree
605 * exists, the node corresponding to the most recently started receiver is
606 * returned.
607 */
608 struct btr_node *audiod_get_btr_root(void)
609 {
610 int i, newest_slot = -1;
611 struct timeval newest_rstime = {0, 0};
612
613 FOR_EACH_SLOT(i) {
614 struct slot_info *s = &slot[i];
615 struct timeval rstime;
616 if (!s->receiver_node)
617 continue;
618 if (s->receiver_node->task.error < 0)
619 continue;
620 btr_get_node_start(s->receiver_node->btrn, &rstime);
621 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
622 continue;
623 newest_rstime = rstime;
624 newest_slot = i;
625 }
626 if (newest_slot == -1)
627 return NULL;
628 return slot[newest_slot].receiver_node->btrn;
629 }
630
631 /* whether a new instance of a decoder should be started. */
632 static bool must_start_decoder(void)
633 {
634 int ret, cafn = stat_task->current_audio_format_num;
635
636 if (cafn < 0 || !stat_task->ct)
637 return false;
638 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
639 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
640 return false;
641 ret = receiver_running(cafn);
642 if (ret != 0) /* already 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 struct timeval a_start, delay;
717 delay.tv_sec = conf.stream_delay_arg / 1000;
718 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
719 stat_task->server_stream_start.tv_sec = sec;
720 stat_task->server_stream_start.tv_usec = usec;
721 if (compute_time_diff(NULL) > 2) {
722 if (stat_task->sa_time_diff_sign < 0)
723 tv_add(&stat_task->server_stream_start,
724 &stat_task->sa_time_diff, &a_start);
725 else
726 tv_diff(&stat_task->server_stream_start,
727 &stat_task->sa_time_diff, &a_start);
728 tv_add(&a_start, &delay, &initial_delay_barrier);
729 }
730 }
731 break;
732 case SI_CURRENT_TIME:
733 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
734 struct timeval tv = {sec, usec};
735 compute_time_diff(&tv);
736 }
737 break;
738 case SI_FORMAT:
739 stat_task->current_audio_format_num
740 = get_audio_format_num(buf);
741 }
742 return 1;
743 }
744
745 static int parse_stream_command(const char *txt, char **cmd)
746 {
747 char *p = strchr(txt, ':');
748 int i;
749
750 if (!p)
751 return -E_MISSING_COLON;
752 p++;
753 FOR_EACH_AUDIO_FORMAT(i) {
754 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
755 continue;
756 *cmd = p;
757 return i;
758 }
759 return -E_UNSUPPORTED_AUDIO_FORMAT;
760 }
761
762 static int add_filter(int format, char *cmdline)
763 {
764 struct audio_format_info *a = &afi[format];
765 int filter_num, nf = a->num_filters;
766
767 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
768 if (filter_num < 0)
769 return filter_num;
770 a->filter_nums[nf] = filter_num;
771 a->num_filters++;
772 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
773 filters[filter_num].name);
774 return filter_num;
775 }
776
777 static int parse_writer_args(void)
778 {
779 int i, ret, nw;
780 char *cmd;
781 struct audio_format_info *a;
782
783 nw = PARA_MAX(1U, conf.writer_given);
784 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
785 FOR_EACH_AUDIO_FORMAT(i) {
786 a = &afi[i];
787 a->writer_conf = para_malloc(nw * sizeof(void *));
788 a->writer_nums = para_malloc(nw * sizeof(int));
789 a->num_writers = 0;
790 }
791 for (i = 0; i < conf.writer_given; i++) {
792 void *wconf;
793 int writer_num;
794 ret = parse_stream_command(conf.writer_arg[i], &cmd);
795 if (ret < 0)
796 goto out;
797 a = &afi[ret];
798 nw = a->num_writers;
799 wconf = check_writer_arg(cmd, &writer_num);
800 if (!wconf) {
801 ret = writer_num;
802 goto out;
803 }
804 a->writer_nums[nw] = writer_num;
805 a->writer_conf[nw] = wconf;
806 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
807 nw, writer_names[writer_num]);
808 a->num_writers++;
809 }
810 ret = 1;
811 out:
812 return ret;
813 }
814
815 static int parse_receiver_args(void)
816 {
817 int i, ret, receiver_num;
818 char *cmd = NULL;
819 struct audio_format_info *a;
820
821 for (i = conf.receiver_given - 1; i >= 0; i--) {
822 char *arg = conf.receiver_arg[i];
823 char *recv_arg = strchr(arg, ':');
824 ret = -E_MISSING_COLON;
825 if (!recv_arg)
826 goto out;
827 *recv_arg = '\0';
828 recv_arg++;
829 ret = get_audio_format_num(arg);
830 if (ret < 0)
831 goto out;
832 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
833 if (!afi[ret].receiver_conf) {
834 ret = -E_RECV_SYNTAX;
835 goto out;
836 }
837 afi[ret].receiver = &receivers[receiver_num];
838 }
839 /* use the first available receiver with no arguments
840 * for those audio formats for which no receiver
841 * was specified
842 */
843 cmd = para_strdup(receivers[0].name);
844 FOR_EACH_AUDIO_FORMAT(i) {
845 a = &afi[i];
846 if (a->receiver_conf)
847 continue;
848 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
849 if (!a->receiver_conf)
850 return -E_RECV_SYNTAX;
851 a->receiver = &receivers[receiver_num];
852 }
853 ret = 1;
854 out:
855 free(cmd);
856 return ret;
857 }
858
859 static int init_default_filters(void)
860 {
861 int i, ret = 1;
862
863 FOR_EACH_AUDIO_FORMAT(i) {
864 struct audio_format_info *a = &afi[i];
865 char *tmp;
866 int j;
867
868 if (a->num_filters)
869 continue; /* no default -- nothing to to */
870 /*
871 * If udp is used to receive this audiod format, add fecdec as
872 * the first filter.
873 */
874 if (strcmp(afi[i].receiver->name, "udp") == 0) {
875 tmp = para_strdup("fecdec");
876 add_filter(i, tmp);
877 free(tmp);
878 if (ret < 0)
879 goto out;
880 }
881 /* add "dec" to audio format name */
882 tmp = make_message("%sdec", audio_formats[i]);
883 for (j = 0; filters[j].name; j++)
884 if (!strcmp(tmp, filters[j].name))
885 break;
886 free(tmp);
887 ret = -E_UNSUPPORTED_FILTER;
888 if (!filters[j].name)
889 goto out;
890 tmp = para_strdup(filters[j].name);
891 ret = add_filter(i, tmp);
892 free(tmp);
893 if (ret < 0)
894 goto out;
895 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
896 filters[j].name);
897 }
898 out:
899 return ret;
900 }
901
902 static int parse_filter_args(void)
903 {
904 int i, ret, nf;
905
906 nf = PARA_MAX(2U, conf.filter_given);
907 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
908 FOR_EACH_AUDIO_FORMAT(i) {
909 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
910 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
911 }
912 if (!conf.no_default_filters_given)
913 return init_default_filters();
914 for (i = 0; i < conf.filter_given; i++) {
915 char *arg = conf.filter_arg[i];
916 char *filter_name = strchr(arg, ':');
917 ret = -E_MISSING_COLON;
918 if (!filter_name)
919 goto out;
920 *filter_name = '\0';
921 filter_name++;
922 ret = get_audio_format_num(arg);
923 if (ret < 0)
924 goto out;
925 ret = add_filter(ret, filter_name);
926 if (ret < 0)
927 goto out;
928 }
929 ret = init_default_filters(); /* use default values for the rest */
930 out:
931 return ret;
932 }
933
934 static int parse_stream_args(void)
935 {
936 int ret;
937
938 ret = parse_receiver_args();
939 if (ret < 0)
940 return ret;
941 ret = parse_filter_args();
942 if (ret < 0)
943 return ret;
944 ret = parse_writer_args();
945 if (ret < 0)
946 return ret;
947 return 1;
948 }
949
950 /* does not unlink socket on errors */
951 static int audiod_get_socket(void)
952 {
953 struct sockaddr_un unix_addr;
954 int ret, fd;
955
956 if (conf.socket_given)
957 socket_name = para_strdup(conf.socket_arg);
958 else {
959 char *hn = para_hostname();
960 socket_name = make_message("/var/paraslash/audiod_socket.%s",
961 hn);
962 free(hn);
963 }
964 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
965 if (conf.force_given)
966 unlink(socket_name);
967 ret = create_local_socket(socket_name, &unix_addr,
968 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
969 if (ret < 0)
970 goto err;
971 fd = ret;
972 if (listen(fd , 5) < 0) {
973 ret = -ERRNO_TO_PARA_ERROR(errno);
974 goto err;
975 }
976 ret = mark_fd_nonblocking(fd);
977 if (ret < 0)
978 goto err;
979 return fd;
980 err:
981 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
982 exit(EXIT_FAILURE);
983 }
984
985 static void signal_pre_select(struct sched *s, struct task *t)
986 {
987 struct signal_task *st = container_of(t, struct signal_task, task);
988 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
989 }
990
991 static void signal_post_select(struct sched *s, struct task *t)
992 {
993 struct signal_task *st = container_of(t, struct signal_task, task);
994
995 if (!FD_ISSET(st->fd, &s->rfds))
996 return;
997
998 st->signum = para_next_signal();
999 switch (st->signum) {
1000 case SIGINT:
1001 case SIGTERM:
1002 case SIGHUP:
1003 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
1004 clean_exit(EXIT_FAILURE, "caught deadly signal");
1005 }
1006 }
1007
1008 static void signal_setup_default(struct signal_task *st)
1009 {
1010 st->task.pre_select = signal_pre_select;
1011 st->task.post_select = signal_post_select;
1012 sprintf(st->task.status, "signal task");
1013 }
1014
1015 static void command_pre_select(struct sched *s, struct task *t)
1016 {
1017 struct command_task *ct = container_of(t, struct command_task, task);
1018 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1019 }
1020
1021 static void command_post_select(struct sched *s, struct task *t)
1022 {
1023 int ret;
1024 struct command_task *ct = container_of(t, struct command_task, task);
1025 static struct timeval last_status_dump;
1026 struct timeval tmp, delay = {0, 500 * 1000};
1027
1028 tv_add(&last_status_dump, &delay, &tmp);
1029 if (tv_diff(&tmp, now, NULL) < 0) {
1030 audiod_status_dump();
1031 last_status_dump = *now;
1032 }
1033
1034 if (!FD_ISSET(ct->fd, &s->rfds))
1035 return;
1036 ret = handle_connect(ct->fd);
1037 if (ret < 0)
1038 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1039 }
1040
1041 static void init_command_task(struct command_task *ct)
1042 {
1043 ct->task.pre_select = command_pre_select;
1044 ct->task.post_select = command_post_select;
1045 ct->task.error = 0;
1046 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1047 sprintf(ct->task.status, "command task");
1048 }
1049
1050 static void close_stat_pipe(void)
1051 {
1052 if (!stat_task->ct)
1053 return;
1054 btr_free_node(stat_task->ct->btrn);
1055 client_close(stat_task->ct);
1056 stat_task->ct = NULL;
1057 clear_and_dump_items();
1058 stat_task->length_seconds = 0;
1059 stat_task->offset_seconds = 0;
1060 stat_task->vss_status = 0;
1061 stat_task->current_audio_format_num = -1;
1062 audiod_status_dump();
1063 }
1064
1065 /**
1066 * close the connection to para_server and exit
1067 *
1068 * \param status the exit status which is passed to exit(3)
1069 * \param msg the log message
1070 *
1071 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1072 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1073 * EXIT_FAILURE.
1074 *
1075 * \sa exit(3)
1076 */
1077 void __noreturn clean_exit(int status, const char *msg)
1078 {
1079 PARA_EMERG_LOG("%s\n", msg);
1080 if (socket_name)
1081 unlink(socket_name);
1082 close_stat_pipe();
1083 exit(status);
1084 }
1085
1086 /* avoid busy loop if server is down */
1087 static void set_stat_task_restart_barrier(unsigned seconds)
1088 {
1089 struct timeval delay = {seconds, 0};
1090 tv_add(now, &delay, &stat_task->restart_barrier);
1091 }
1092
1093 static void try_to_close_slot(int slot_num)
1094 {
1095 struct slot_info *s = &slot[slot_num];
1096 struct audio_format_info *a = afi + s->format;
1097 int i;
1098
1099 if (s->format < 0)
1100 return;
1101 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1102 return;
1103 for (i = 0; i < a->num_filters; i++)
1104 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1105 return;
1106 if (a->num_writers > 0) {
1107 for (i = 0; i < a->num_writers; i++)
1108 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1109 return;
1110 } else {
1111 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1112 return;
1113 }
1114 PARA_INFO_LOG("closing slot %d\n", slot_num);
1115 close_writers(s);
1116 close_filters(s);
1117 close_receiver(slot_num);
1118 clear_slot(slot_num);
1119 }
1120
1121 /*
1122 * Check if any receivers/filters/writers need to be started and do so if
1123 * necessary.
1124 */
1125 static void start_stop_decoders(void)
1126 {
1127 int i, ret;
1128 struct slot_info *sl;
1129 struct audio_format_info *a;
1130
1131 FOR_EACH_SLOT(i)
1132 try_to_close_slot(i);
1133 if (audiod_status != AUDIOD_ON ||
1134 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1135 return kill_all_decoders(-E_NOT_PLAYING);
1136 if (!must_start_decoder())
1137 return;
1138 ret = open_receiver(stat_task->current_audio_format_num);
1139 if (ret < 0) {
1140 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1141 return;
1142 }
1143 sl = slot + ret;
1144 a = afi + sl->format;
1145 if (a->num_filters)
1146 open_filters(sl);
1147 open_writers(sl);
1148 activate_grab_clients();
1149 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1150 }
1151
1152 static void status_pre_select(struct sched *s, struct task *t)
1153 {
1154 struct status_task *st = container_of(t, struct status_task, task);
1155 int ret, cafn = stat_task->current_audio_format_num;
1156
1157 if (must_start_decoder())
1158 goto min_delay;
1159 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1160 if (ret > 0)
1161 goto min_delay;
1162 if (!st->ct)
1163 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1164 if (cafn >= 0)
1165 sched_request_barrier(&afi[cafn].restart_barrier, s);
1166 return;
1167 min_delay:
1168 sched_min_delay(s);
1169 }
1170
1171 /* restart the client task if necessary */
1172 static void status_post_select(__a_unused struct sched *s, struct task *t)
1173 {
1174 struct status_task *st = container_of(t, struct status_task, task);
1175
1176 if (audiod_status == AUDIOD_OFF) {
1177 if (!st->ct)
1178 goto out;
1179 if (st->ct->task.error >= 0) {
1180 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1181 goto out;
1182 }
1183 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1184 goto out;
1185 close_stat_pipe();
1186 st->clock_diff_count = conf.clock_diff_count_arg;
1187 goto out;
1188 }
1189 if (st->ct) {
1190 char *buf;
1191 size_t sz;
1192 int ret;
1193 if (st->ct->task.error < 0) {
1194 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1195 goto out;
1196 close_stat_pipe();
1197 goto out;
1198 }
1199 if (st->ct->status != CL_RECEIVING)
1200 goto out;
1201 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1202 if (ret <= 0)
1203 goto out;
1204 sz = btr_next_buffer(st->btrn, &buf);
1205 ret = for_each_stat_item(buf, sz, update_item);
1206 if (ret < 0) {
1207 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1208 goto out;
1209 }
1210 if (sz != ret)
1211 st->last_status_read = *now;
1212 else {
1213 struct timeval diff;
1214 tv_diff(now, &st->last_status_read, &diff);
1215 if (diff.tv_sec > 61)
1216 kill_btrn(st->ct->btrn, &st->ct->task,
1217 -E_STATUS_TIMEOUT);
1218 }
1219 btr_consume(st->btrn, sz - ret);
1220 goto out;
1221 }
1222 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1223 goto out;
1224 if (st->clock_diff_count) { /* get status only one time */
1225 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1226 int argc = 5;
1227 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1228 st->clock_diff_count--;
1229 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1230 set_stat_task_restart_barrier(2);
1231
1232 } else {
1233 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1234 int argc = 4;
1235 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1236 set_stat_task_restart_barrier(5);
1237 }
1238 free(stat_item_values[SI_BASENAME]);
1239 stat_item_values[SI_BASENAME] = para_strdup(
1240 "no connection to para_server");
1241 stat_client_write_item(SI_BASENAME);
1242 st->last_status_read = *now;
1243 out:
1244 start_stop_decoders();
1245 }
1246
1247 static void init_status_task(struct status_task *st)
1248 {
1249 memset(st, 0, sizeof(struct status_task));
1250 st->task.pre_select = status_pre_select;
1251 st->task.post_select = status_post_select;
1252 st->sa_time_diff_sign = 1;
1253 st->clock_diff_count = conf.clock_diff_count_arg;
1254 st->current_audio_format_num = -1;
1255 sprintf(st->task.status, "stat");
1256 st->btrn = btr_new_node(&(struct btr_node_description)
1257 EMBRACE(.name = "stat"));
1258 }
1259
1260 static void set_initial_status(void)
1261 {
1262 audiod_status = AUDIOD_ON;
1263 if (!conf.mode_given)
1264 return;
1265 if (!strcmp(conf.mode_arg, "sb")) {
1266 audiod_status = AUDIOD_STANDBY;
1267 return;
1268 }
1269 if (!strcmp(conf.mode_arg, "off")) {
1270 audiod_status = AUDIOD_OFF;
1271 return;
1272 }
1273 if (strcmp(conf.mode_arg, "on"))
1274 PARA_WARNING_LOG("invalid mode\n");
1275 }
1276
1277 __noreturn static void print_help_and_die(void)
1278 {
1279 int d = conf.detailed_help_given;
1280 const char **p = d? audiod_args_info_detailed_help
1281 : audiod_args_info_help;
1282
1283 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1284 AUDIOD_CMDLINE_PARSER_VERSION);
1285 printf_or_die("%s\n\n", audiod_args_info_usage);
1286 for (; *p; p++)
1287 printf_or_die("%s\n", *p);
1288 print_receiver_helps(d);
1289 print_filter_helps(d);
1290 print_writer_helps(d);
1291 exit(0);
1292 }
1293
1294 static void init_colors_or_die(void)
1295 {
1296 int ret, i;
1297
1298 if (!want_colors())
1299 return;
1300 daemon_set_default_log_colors();
1301 daemon_set_flag(DF_COLOR_LOG);
1302 for (i = 0; i < conf.log_color_given; i++) {
1303 ret = daemon_set_log_color(conf.log_color_arg[i]);
1304 if (ret < 0)
1305 exit(EXIT_FAILURE);
1306 }
1307 }
1308
1309 /**
1310 * the main function of para_audiod
1311 *
1312 * \param argc usual argument count
1313 * \param argv usual argument vector
1314 *
1315 * \return EXIT_SUCCESS or EXIT_FAILURE
1316 *
1317 * \sa para_audiod(1)
1318 * */
1319 int main(int argc, char *argv[])
1320 {
1321 int ret, i;
1322 static struct sched s;
1323 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1324 struct audiod_cmdline_parser_params params = {
1325 .override = 0,
1326 .initialize = 1,
1327 .check_required = 0,
1328 .check_ambiguity = 0,
1329 .print_errors = 1
1330 };
1331
1332 valid_fd_012();
1333 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1334 exit(EXIT_FAILURE);
1335 HANDLE_VERSION_FLAG("audiod", conf);
1336 /* init receivers/filters/writers early to make help work */
1337 recv_init();
1338 filter_init();
1339 writer_init();
1340 if (conf.help_given || conf.detailed_help_given)
1341 print_help_and_die();
1342 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1343 parse_config_or_die();
1344 init_colors_or_die();
1345 init_random_seed_or_die();
1346 daemon_set_flag(DF_LOG_TIME);
1347 daemon_set_flag(DF_LOG_HOSTNAME);
1348 daemon_set_flag(DF_LOG_LL);
1349 if (conf.log_timing_given)
1350 daemon_set_flag(DF_LOG_TIMING);
1351 if (conf.logfile_given) {
1352 daemon_set_logfile(conf.logfile_arg);
1353 daemon_open_log_or_die();
1354 }
1355 ret = parse_stream_args();
1356 if (ret < 0) {
1357 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1358 exit(EXIT_FAILURE);
1359 }
1360 log_welcome("para_audiod");
1361 server_uptime(UPTIME_SET);
1362 set_initial_status();
1363 FOR_EACH_SLOT(i)
1364 clear_slot(i);
1365 setup_signal_handling();
1366 signal_setup_default(sig_task);
1367
1368 init_status_task(stat_task);
1369 init_command_task(cmd_task);
1370
1371 if (conf.daemon_given)
1372 daemonize();
1373
1374 register_task(&sig_task->task);
1375 register_task(&cmd_task->task);
1376 register_task(&stat_task->task);
1377 s.default_timeout.tv_sec = 2;
1378 s.default_timeout.tv_usec = 999 * 1000;
1379 ret = schedule(&s);
1380
1381 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1382 return EXIT_FAILURE;
1383 }