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