audiod: Skip NULL pointer check in compute_time_diff().
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2014 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
12 #include "para.h"
13 #include "error.h"
14 #include "crypt.h"
15 #include "audiod.cmdline.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "buffer_tree.h"
20 #include "recv.h"
21 #include "filter.h"
22 #include "grab_client.h"
23 #include "client.cmdline.h"
24 #include "client.h"
25 #include "audiod.h"
26 #include "net.h"
27 #include "daemon.h"
28 #include "string.h"
29 #include "fd.h"
30 #include "write.h"
31 #include "write_common.h"
32 #include "signal.h"
33 #include "version.h"
34
35 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
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 DEFINE_RECEIVER_ARRAY;
42
43 /** Defines how audiod handles one supported audio format. */
44 struct audio_format_info {
45 /** pointer to the receiver for this audio format */
46 struct receiver *receiver;
47 /** the receiver configuration */
48 void *receiver_conf;
49 /** the number of filters that should be activated for this audio format */
50 unsigned int num_filters;
51 /** Array of filter numbers to be activated. */
52 unsigned *filter_nums;
53 /** Pointer to the array of filter configurations. */
54 void **filter_conf;
55 /** the number of filters that should be activated for this audio format */
56 unsigned int num_writers;
57 /** Array of writer numbers to be activated. */
58 int *writer_nums;
59 /** pointer to the array of writer configurations */
60 void **writer_conf;
61 /** do not start receiver/filters/writer before this time */
62 struct timeval restart_barrier;
63 };
64
65 /**
66 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
67 * be associated with a receiver/filter/writer triple. This array holds all
68 * information on the status of these slots.
69 *
70 * \sa struct slot_info
71 * */
72 struct slot_info slot[MAX_STREAM_SLOTS];
73
74 /** The vss status flags audiod is interested in. */
75 enum vss_status_flags {
76 /** Whether the 'N' flag is set. */
77 VSS_STATUS_FLAG_NEXT = 1,
78 /** The 'P' flag is set. */
79 VSS_STATUS_FLAG_PLAYING = 2,
80 };
81
82 /**
83 * The scheduler instance of para_audiod.
84 *
85 * This is needed also in audiod_command.c (for the tasks command), so it can
86 * not be made static.
87 */
88 struct sched sched = {.max_fileno = 0};
89
90 /**
91 * The task for obtaining para_server's status (para_client stat).
92 *
93 * \sa struct task, struct sched.
94 */
95 struct status_task {
96 /** The associated task structure of audiod. */
97 struct task task;
98 /** Client data associated with the stat task. */
99 struct client_task *ct;
100 /** Do not restart client command until this time. */
101 struct timeval restart_barrier;
102 /** Last time we received status data from para_server. */
103 struct timeval last_status_read;
104 size_t min_iqs;
105 /** The offset value announced by para_server. */
106 int offset_seconds;
107 /** The length of the current audio file as announced by para_server. */
108 int length_seconds;
109 /** The start of the current stream from the view of para_server. */
110 struct timeval server_stream_start;
111 /** The average time deviation between para_server and para_audiod. */
112 struct timeval sa_time_diff;
113 /** Whether client time is ahead of server time. */
114 int sa_time_diff_sign;
115 /** The 'P' and the 'N' flags as announced by para_server. */
116 enum vss_status_flags vss_status;
117 /** Number of times the clock difference is to be checked. */
118 unsigned clock_diff_count;
119 /** When to start the next check for clock difference. */
120 struct timeval clock_diff_barrier;
121 /** Number of the audio format as announced by para_server. */
122 int current_audio_format_num;
123 /* The status task btrn is the child of the client task. */
124 struct btr_node *btrn;
125 };
126
127 /** The array of status items sent by para_server. */
128 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
129
130 /**
131 * the current mode of operation of which can be changed by the on/off/cycle
132 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
133 */
134 int audiod_status = AUDIOD_ON;
135
136 /**
137 * the gengetopt args_info struct that holds information on all command line
138 * arguments
139 */
140 struct audiod_args_info conf;
141
142 static char *socket_name;
143 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
144
145 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
146
147 static struct status_task status_task_struct;
148
149 /**
150 * the task that calls the status command of para_server
151 *
152 * \sa struct status_task
153 */
154 static struct status_task *stat_task = &status_task_struct;
155
156 /**
157 * the task for handling audiod commands
158 *
159 * \sa struct task, struct sched
160 */
161 struct command_task {
162 /** the local listening socket */
163 int fd;
164 /** the associated task structure */
165 struct task task;
166 };
167
168 /** iterate over all supported audio formats */
169 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
170
171 /**
172 * Get the audio format number.
173 *
174 * \param name The name of the audio format.
175 *
176 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
177 * \a name is not a supported audio format.
178 */
179 static int get_audio_format_num(const char *name)
180 {
181 int i;
182
183 while (para_isspace(*name))
184 name++;
185 FOR_EACH_AUDIO_FORMAT(i)
186 if (!strcmp(name, audio_formats[i]))
187 return i;
188 return -E_UNSUPPORTED_AUDIO_FORMAT;
189 }
190
191 static int get_matching_audio_format_nums(const char *re)
192 {
193 int i, ret;
194 regex_t preg;
195
196 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
197 if (ret < 0)
198 return ret;
199 ret = 0;
200 FOR_EACH_AUDIO_FORMAT(i)
201 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
202 ret |= (1 << i);
203 regfree(&preg);
204 return ret;
205 }
206
207 /**
208 * Compute the play time based on information of the given slot.
209 *
210 * \param slot_num The slot number (negative means: no slot).
211 *
212 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
213 * from the status items received from para_server and the start time of the
214 * (first) writer of the given slot.
215 *
216 * It has to take into account that the stream was probably not started at
217 * the beginning of the file, that the clock between the server and the client
218 * host may differ and that playback of the stream was delayed, e.g. because
219 * the prebuffer filter is used in the filter configuration of the given slot.
220 *
221 * If no writer is active in the given slot, or \a slot_num is negative
222 * (indicating that para_audiod runs in standby mode), an approximation based
223 * only on the status items is computed and the returned string is prefixed
224 * with "~".
225 *
226 * \return A string that must be freed by the caller.
227 */
228 char *get_time_string(int slot_num)
229 {
230 int ret, seconds = 0, length;
231 struct timeval *tmp, sum, sss, /* server stream start */
232 rstime, /* receiver start time */
233 wstime, /* writer start time */
234 wtime, /* now - writer start */
235 rskip; /* receiver start - sss */
236 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
237 char *msg;
238
239 if (audiod_status == AUDIOD_OFF)
240 goto empty;
241 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
242 if (stat_task->length_seconds) /* paused */
243 return NULL;
244 goto empty; /* stopped */
245 }
246 if (audiod_status == AUDIOD_ON && !s)
247 goto empty;
248 /*
249 * Valid status items and playing, set length and tmp to the stream
250 * start. We use the slot info and fall back to the info from current
251 * status items if no slot info is available.
252 */
253 length = stat_task->length_seconds;
254 tmp = &stat_task->server_stream_start;
255 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
256 btr_get_node_start(s->wns[0].btrn, &wstime);
257 if (wstime.tv_sec != 0) { /* writer wrote something */
258 if (s->server_stream_start.tv_sec == 0) {
259 /* copy status info to slot */
260 s->server_stream_start = stat_task->server_stream_start;
261 s->offset_seconds = stat_task->offset_seconds;
262 s->seconds_total = stat_task->length_seconds;
263 }
264 length = s->seconds_total;
265 tmp = &s->server_stream_start;
266 }
267 }
268 if (stat_task->sa_time_diff_sign > 0)
269 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
270 else
271 tv_add(tmp, &stat_task->sa_time_diff, &sss);
272 if (!s || !s->wns || !s->wns[0].btrn) {
273 struct timeval diff;
274 tv_diff(now, &sss, &diff);
275 seconds = diff.tv_sec + stat_task->offset_seconds;
276 goto out;
277 }
278 tv_diff(now, &wstime, &wtime);
279 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
280 seconds = s->offset_seconds;
281 if (s->receiver_node->btrn) {
282 btr_get_node_start(s->receiver_node->btrn, &rstime);
283 ret = tv_diff(&rstime, &sss, &rskip);
284 if (ret > 0) { /* audiod was started in the middle of the stream */
285 tv_add(&wtime, &rskip, &sum);
286 seconds += sum.tv_sec;
287 } else
288 seconds += wtime.tv_sec;
289 } else
290 seconds += wtime.tv_sec;
291 out:
292 seconds = PARA_MIN(seconds, length);
293 seconds = PARA_MAX(seconds, 0);
294 msg = make_message(
295 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
296 s? "" : "~",
297 seconds / 60,
298 seconds % 60,
299 (length - seconds) / 60,
300 (length - seconds) % 60,
301 length? (seconds * 100 + length / 2) / length : 0,
302 length / 60,
303 length % 60
304 );
305 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
306 return msg;
307 empty:
308 return para_strdup(NULL);
309 }
310
311 static int want_colors(void)
312 {
313 if (conf.color_arg == color_arg_no)
314 return 0;
315 if (conf.color_arg == color_arg_yes)
316 return 1;
317 if (conf.logfile_given)
318 return 0;
319 return isatty(STDERR_FILENO);
320 }
321
322 static void parse_config_or_die(void)
323 {
324 int ret;
325 char *config_file;
326 struct audiod_cmdline_parser_params params = {
327 .override = 0,
328 .initialize = 0,
329 .check_required = 1,
330 .check_ambiguity = 0,
331 .print_errors = 1
332 };
333
334 if (conf.config_file_given)
335 config_file = para_strdup(conf.config_file_arg);
336 else {
337 char *home = para_homedir();
338 config_file = make_message("%s/.paraslash/audiod.conf", home);
339 free(home);
340 }
341 ret = file_exists(config_file);
342 if (conf.config_file_given && !ret) {
343 PARA_EMERG_LOG("can not read config file %s\n", config_file);
344 goto err;
345 }
346 if (ret) {
347 audiod_cmdline_parser_config_file(config_file, &conf, &params);
348 daemon_set_loglevel(conf.loglevel_arg);
349 }
350 free(config_file);
351 return;
352 err:
353 free(config_file);
354 exit(EXIT_FAILURE);
355 }
356
357 static void setup_signal_handling(void)
358 {
359 sig_task->fd = para_signal_init();
360 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
361 para_install_sighandler(SIGINT);
362 para_install_sighandler(SIGTERM);
363 para_install_sighandler(SIGHUP);
364 para_sigaction(SIGPIPE, SIG_IGN);
365 }
366
367 static void clear_slot(int slot_num)
368 {
369 struct slot_info *s = &slot[slot_num];
370
371 PARA_INFO_LOG("clearing slot %d\n", slot_num);
372 memset(s, 0, sizeof(struct slot_info));
373 s->format = -1;
374 }
375
376 static void close_receiver(int slot_num)
377 {
378 struct slot_info *s = &slot[slot_num];
379 struct audio_format_info *a;
380
381 if (s->format < 0 || !s->receiver_node)
382 return;
383 a = &afi[s->format];
384 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
385 audio_formats[s->format], slot_num);
386 a->receiver->close(s->receiver_node);
387 btr_remove_node(&s->receiver_node->btrn);
388 free(s->receiver_node);
389 s->receiver_node = NULL;
390 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
391 &a->restart_barrier);
392 }
393
394 static void writer_cleanup(struct writer_node *wn)
395 {
396 struct writer *w;
397
398 if (!wn)
399 return;
400 w = writers + wn->writer_num;
401 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
402 w->close(wn);
403 btr_remove_node(&wn->btrn);
404 }
405
406 static void close_writers(struct slot_info *s)
407 {
408 struct audio_format_info *a;
409 int i;
410
411 if (s->format < 0)
412 return;
413 assert(s->wns);
414 a = afi + s->format;
415 if (a->num_writers == 0)
416 writer_cleanup(s->wns);
417 else {
418 for (i = 0; i < a->num_writers; i++)
419 writer_cleanup(s->wns + i);
420 }
421 free(s->wns);
422 s->wns = NULL;
423 }
424
425 static void close_filters(struct slot_info *s)
426 {
427 int i;
428 struct audio_format_info *a = afi + s->format;
429 if (a->num_filters == 0)
430 return;
431 for (i = a->num_filters - 1; i >= 0; i--) {
432 struct filter_node *fn = s->fns + i;
433 struct filter *f;
434
435 if (!fn)
436 continue;
437 f = filters + fn->filter_num;
438 if (f->close)
439 f->close(fn);
440 btr_remove_node(&fn->btrn);
441 }
442 free(s->fns);
443 s->fns = NULL;
444 }
445
446 static void notify_receivers(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 task_notify(&s->receiver_node->task, error);
457 }
458 }
459
460 static int get_empty_slot(void)
461 {
462 int i;
463 struct slot_info *s;
464
465 FOR_EACH_SLOT(i) {
466 s = &slot[i];
467 if (s->format < 0) {
468 clear_slot(i);
469 return i;
470 }
471 if (s->wns || s->receiver_node || s->fns)
472 continue;
473 clear_slot(i);
474 return i;
475 }
476 return -E_NO_MORE_SLOTS;
477 }
478
479 static void open_filters(struct slot_info *s)
480 {
481 struct audio_format_info *a = afi + s->format;
482 struct filter_node *fn;
483 int nf = a->num_filters;
484 struct btr_node *parent;
485 int i;
486
487 if (nf == 0)
488 return;
489 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
490 assert(s->fns == NULL);
491 s->fns = para_calloc(nf * sizeof(struct filter_node));
492 parent = s->receiver_node->btrn;
493 for (i = 0; i < nf; i++) {
494 struct filter *f = filters + a->filter_nums[i];
495 fn = s->fns + i;
496 fn->filter_num = a->filter_nums[i];
497 fn->conf = a->filter_conf[i];
498 fn->task.pre_select = f->pre_select;
499 fn->task.post_select = f->post_select;
500 fn->btrn = btr_new_node(&(struct btr_node_description)
501 EMBRACE(.name = f->name, .parent = parent,
502 .handler = f->execute, .context = fn));
503
504 f->open(fn);
505 register_task(&sched, &fn->task);
506 parent = fn->btrn;
507 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
508 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
509 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
510 }
511 }
512
513 static void open_writers(struct slot_info *s)
514 {
515 int i;
516 struct audio_format_info *a = afi + s->format;
517 struct writer_node *wn;
518 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
519
520 assert(s->wns == NULL);
521 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
522 * sizeof(struct writer_node));
523 for (i = 0; i < a->num_writers; i++) {
524 wn = s->wns + i;
525 wn->conf = a->writer_conf[i];
526 wn->writer_num = a->writer_nums[i];
527 register_writer_node(wn, parent, &sched);
528 PARA_NOTICE_LOG("%s writer started in slot %d\n",
529 writer_names[a->writer_nums[i]], (int)(s - slot));
530 }
531 }
532
533 /* returns slot num on success */
534 static int open_receiver(int format)
535 {
536 struct audio_format_info *a = &afi[format];
537 struct slot_info *s;
538 int ret, slot_num;
539 struct receiver *r = a->receiver;
540 struct receiver_node *rn;
541
542 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
543 ret = get_empty_slot();
544 if (ret < 0)
545 return ret;
546 slot_num = ret;
547 rn = para_calloc(sizeof(*rn));
548 rn->receiver = r;
549 rn->conf = a->receiver_conf;
550 rn->btrn = btr_new_node(&(struct btr_node_description)
551 EMBRACE(.name = r->name, .context = rn));
552 ret = r->open(rn);
553 if (ret < 0) {
554 btr_remove_node(&rn->btrn);
555 free(rn);
556 return ret;
557 }
558 s = &slot[slot_num];
559 s->format = format;
560 s->receiver_node = rn;
561 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
562 audio_formats[format], r->name, slot_num);
563 rn->task.pre_select = r->pre_select;
564 rn->task.post_select = r->post_select;
565 sprintf(rn->task.status, "%s receiver node", r->name);
566 register_task(&sched, &rn->task);
567 return slot_num;
568 }
569
570 static bool receiver_running(void)
571 {
572 int i;
573 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
574
575 FOR_EACH_SLOT(i) {
576 struct slot_info *s = &slot[i];
577 long unsigned ss2 = s->server_stream_start.tv_sec;
578
579 if (!s->receiver_node)
580 continue;
581 if (s->receiver_node->task.error >= 0)
582 return true;
583 if (ss1 == ss2)
584 return true;
585 }
586 return false;
587 }
588
589 /**
590 * Return the root node of the current buffer tree.
591 *
592 * This is only used for stream grabbing.
593 *
594 * \return \p NULL if no slot is currently active. If more than one buffer tree
595 * exists, the node corresponding to the most recently started receiver is
596 * returned.
597 */
598 struct btr_node *audiod_get_btr_root(void)
599 {
600 int i, newest_slot = -1;
601 struct timeval newest_rstime = {0, 0};
602
603 FOR_EACH_SLOT(i) {
604 struct slot_info *s = &slot[i];
605 struct timeval rstime;
606 if (!s->receiver_node)
607 continue;
608 if (s->receiver_node->task.error < 0)
609 continue;
610 btr_get_node_start(s->receiver_node->btrn, &rstime);
611 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
612 continue;
613 newest_rstime = rstime;
614 newest_slot = i;
615 }
616 if (newest_slot == -1)
617 return NULL;
618 return slot[newest_slot].receiver_node->btrn;
619 }
620
621 /* whether a new instance of a decoder should be started. */
622 static bool must_start_decoder(void)
623 {
624 int cafn = stat_task->current_audio_format_num;
625 unsigned vs = stat_task->vss_status;
626
627 if (audiod_status != AUDIOD_ON)
628 return false;
629 if (cafn < 0)
630 return false;
631 if (!stat_task->ct)
632 return false;
633 if (vs & VSS_STATUS_FLAG_NEXT)
634 return false;
635 if (!(vs & VSS_STATUS_FLAG_PLAYING))
636 return false;
637 if (receiver_running())
638 return false;
639 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
640 return false;
641 return true;
642 }
643
644 static void compute_time_diff(const struct timeval *status_time)
645 {
646 struct timeval tmp, diff;
647 static unsigned count;
648 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
649 const struct timeval max_deviation = {0, 500 * 1000};
650 const int time_smooth = 5;
651
652 sign = tv_diff(status_time, now, &diff);
653 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
654 // sign, sa_time_diff_sign);
655 if (!count) {
656 sa_time_diff_sign = sign;
657 stat_task->sa_time_diff = diff;
658 count++;
659 goto out;
660 }
661 if (count > 5) {
662 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
663 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
664 PARA_WARNING_LOG("time diff jump: %lims\n",
665 s * tv2ms(&tmp));
666 }
667 count++;
668 sa_time_diff_sign = tv_convex_combination(
669 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
670 count > 10? sign : sign * time_smooth, &diff,
671 &tmp);
672 stat_task->sa_time_diff = tmp;
673 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
674 sign < 0? "-" : "+",
675 tv2ms(&diff),
676 sa_time_diff_sign < 0? "-" : "+",
677 tv2ms(&stat_task->sa_time_diff)
678 );
679 out:
680 stat_task->sa_time_diff_sign = sa_time_diff_sign;
681 }
682
683 static int update_item(int itemnum, char *buf)
684 {
685 long unsigned sec, usec;
686
687 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
688 return 1;
689 free(stat_item_values[itemnum]);
690 stat_item_values[itemnum] = para_strdup(buf);
691 stat_client_write_item(itemnum);
692 switch (itemnum) {
693 case SI_STATUS_FLAGS:
694 stat_task->vss_status = 0;
695 if (strchr(buf, 'N'))
696 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
697 if (strchr(buf, 'P'))
698 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
699 break;
700 case SI_OFFSET:
701 stat_task->offset_seconds = atoi(buf);
702 break;
703 case SI_SECONDS_TOTAL:
704 stat_task->length_seconds = atoi(buf);
705 break;
706 case SI_STREAM_START:
707 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
708 stat_task->server_stream_start.tv_sec = sec;
709 stat_task->server_stream_start.tv_usec = usec;
710 }
711 break;
712 case SI_CURRENT_TIME:
713 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
714 struct timeval tv = {sec, usec};
715 compute_time_diff(&tv);
716 }
717 break;
718 case SI_FORMAT:
719 stat_task->current_audio_format_num
720 = get_audio_format_num(buf);
721 }
722 return 1;
723 }
724
725 static int parse_stream_command(const char *txt, char **cmd)
726 {
727 int ret, len;
728 char *re, *p = strchr(txt, ':');
729
730 if (!p)
731 return -E_MISSING_COLON;
732 *cmd = p + 1;
733 len = p - txt;
734 re = malloc(len + 1);
735 strncpy(re, txt, len);
736 re[len] = '\0';
737 ret = get_matching_audio_format_nums(re);
738 free(re);
739 return ret;
740 }
741
742 static int add_filter(int format, char *cmdline)
743 {
744 struct audio_format_info *a = &afi[format];
745 int filter_num, nf = a->num_filters;
746 void *cfg;
747
748 filter_num = check_filter_arg(cmdline, &cfg);
749 if (filter_num < 0)
750 return filter_num;
751 a->filter_conf = para_realloc(a->filter_conf,
752 (nf + 1) * sizeof(void *));
753 a->filter_nums = para_realloc(a->filter_nums,
754 (nf + 1) * sizeof(unsigned));
755 a->filter_nums[nf] = filter_num;
756 a->filter_conf[nf] = cfg;
757 a->num_filters++;
758 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
759 filters[filter_num].name);
760 return filter_num;
761 }
762
763 static int parse_writer_args(void)
764 {
765 int i, ret;
766 char *cmd;
767 struct audio_format_info *a;
768
769 for (i = 0; i < conf.writer_given; i++) {
770 void *wconf;
771 int j, nw, writer_num, af_mask;
772
773 ret = parse_stream_command(conf.writer_arg[i], &cmd);
774 if (ret < 0)
775 return ret;
776 af_mask = ret;
777 FOR_EACH_AUDIO_FORMAT(j) {
778 a = afi + j;
779 if ((af_mask & (1 << j)) == 0) /* no match */
780 continue;
781 wconf = check_writer_arg_or_die(cmd, &writer_num);
782 nw = a->num_writers;
783 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
784 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
785 a->writer_nums[nw] = writer_num;
786 a->writer_conf[nw] = wconf;
787 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
788 nw, writer_names[writer_num]);
789 a->num_writers++;
790 }
791 }
792 /* Use default writer for audio formats which are not yet set up. */
793 FOR_EACH_AUDIO_FORMAT(i) {
794 void *writer_conf;
795 int writer_num;
796 a = afi + i;
797 if (a->num_writers > 0)
798 continue; /* already set up */
799 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
800 a->writer_nums = para_malloc(sizeof(int));
801 a->writer_nums[0] = writer_num;
802 a->writer_conf = para_malloc(sizeof(void *));
803 a->writer_conf[0] = writer_conf;
804 a->num_writers = 1;
805 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
806 writer_names[writer_num]);
807 }
808 return 1;
809 }
810
811 static int parse_receiver_args(void)
812 {
813 int i, ret, receiver_num;
814 char *cmd = NULL;
815 struct audio_format_info *a;
816
817 for (i = conf.receiver_given - 1; i >= 0; i--) {
818 char *arg;
819 int j, af_mask;
820
821 ret = parse_stream_command(conf.receiver_arg[i], &arg);
822 if (ret < 0)
823 goto out;
824 af_mask = ret;
825 FOR_EACH_AUDIO_FORMAT(j) {
826 a = afi + j;
827 if ((af_mask & (1 << j)) == 0) /* no match */
828 continue;
829 /*
830 * If multiple receivers are given for this audio format, the
831 * last one wins and we have to free the previous receiver
832 * config here. Since we are iterating backwards, the winning
833 * receiver arg is in fact the first one given.
834 */
835 if (a->receiver_conf)
836 a->receiver->free_config(a->receiver_conf);
837 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
838 ret = -E_RECV_SYNTAX;
839 if (!a->receiver_conf)
840 goto out;
841 a->receiver = receivers + receiver_num;
842 }
843 }
844 /*
845 * Use the first available receiver with no arguments for those audio
846 * formats for which no receiver was specified.
847 */
848 cmd = para_strdup(receivers[0].name);
849 FOR_EACH_AUDIO_FORMAT(i) {
850 a = &afi[i];
851 if (a->receiver_conf)
852 continue;
853 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
854 if (!a->receiver_conf)
855 return -E_RECV_SYNTAX;
856 a->receiver = &receivers[receiver_num];
857 }
858 FOR_EACH_AUDIO_FORMAT(i) {
859 a = afi + i;
860 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
861 audio_formats[i], a->receiver->name);
862 }
863 ret = 1;
864 out:
865 free(cmd);
866 return ret;
867 }
868
869 static int init_default_filters(void)
870 {
871 int i, ret = 1;
872
873 FOR_EACH_AUDIO_FORMAT(i) {
874 struct audio_format_info *a = &afi[i];
875 char *tmp;
876 int j;
877
878 if (a->num_filters)
879 continue; /* no default -- nothing to to */
880 /*
881 * udp and dccp streams are fec-encoded, so add fecdec as the
882 * first filter.
883 */
884 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
885 strcmp(afi[i].receiver->name, "dccp") == 0) {
886 tmp = para_strdup("fecdec");
887 add_filter(i, tmp);
888 free(tmp);
889 if (ret < 0)
890 goto out;
891 }
892 /* add "dec" to audio format name */
893 tmp = make_message("%sdec", audio_formats[i]);
894 for (j = 0; filters[j].name; j++)
895 if (!strcmp(tmp, filters[j].name))
896 break;
897 free(tmp);
898 ret = -E_UNSUPPORTED_FILTER;
899 if (!filters[j].name)
900 goto out;
901 tmp = para_strdup(filters[j].name);
902 ret = add_filter(i, tmp);
903 free(tmp);
904 if (ret < 0)
905 goto out;
906 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
907 filters[j].name);
908 }
909 out:
910 return ret;
911 }
912
913 static int parse_filter_args(void)
914 {
915 int i, j, ret, af_mask, num_matches;
916
917 for (i = 0; i < conf.filter_given; i++) {
918 char *arg;
919 ret = parse_stream_command(conf.filter_arg[i], &arg);
920 if (ret < 0)
921 goto out;
922 af_mask = ret;
923 num_matches = 0;
924 FOR_EACH_AUDIO_FORMAT(j) {
925 if ((af_mask & (1 << j)) == 0) /* no match */
926 continue;
927 ret = add_filter(j, arg);
928 if (ret < 0)
929 goto out;
930 num_matches++;
931 }
932 if (num_matches == 0)
933 PARA_WARNING_LOG("ignoring filter spec: %s\n",
934 conf.filter_arg[i]);
935 }
936 ret = init_default_filters(); /* use default values for the rest */
937 out:
938 return ret;
939 }
940
941 static int parse_stream_args(void)
942 {
943 int ret;
944
945 ret = parse_receiver_args();
946 if (ret < 0)
947 return ret;
948 ret = parse_filter_args();
949 if (ret < 0)
950 return ret;
951 ret = parse_writer_args();
952 if (ret < 0)
953 return ret;
954 return 1;
955 }
956
957 /* does not unlink socket on errors */
958 static int audiod_get_socket(void)
959 {
960 struct sockaddr_un unix_addr;
961 int ret, fd;
962
963 if (conf.socket_given)
964 socket_name = para_strdup(conf.socket_arg);
965 else {
966 char *hn = para_hostname();
967 socket_name = make_message("/var/paraslash/audiod_socket.%s",
968 hn);
969 free(hn);
970 }
971 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
972 if (conf.force_given)
973 unlink(socket_name);
974 ret = create_local_socket(socket_name, &unix_addr,
975 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
976 if (ret < 0)
977 goto err;
978 fd = ret;
979 if (listen(fd , 5) < 0) {
980 ret = -ERRNO_TO_PARA_ERROR(errno);
981 goto err;
982 }
983 ret = mark_fd_nonblocking(fd);
984 if (ret < 0)
985 goto err;
986 return fd;
987 err:
988 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
989 exit(EXIT_FAILURE);
990 }
991
992 static void signal_pre_select(struct sched *s, struct task *t)
993 {
994 struct signal_task *st = container_of(t, struct signal_task, task);
995 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
996 }
997
998 static int signal_post_select(struct sched *s, __a_unused struct task *t)
999 {
1000 int signum;
1001
1002 signum = para_next_signal(&s->rfds);
1003 switch (signum) {
1004 case SIGINT:
1005 case SIGTERM:
1006 case SIGHUP:
1007 PARA_NOTICE_LOG("received signal %d\n", signum);
1008 clean_exit(EXIT_FAILURE, "caught deadly signal");
1009 }
1010 return 0;
1011 }
1012
1013 static void signal_setup_default(struct signal_task *st)
1014 {
1015 st->task.pre_select = signal_pre_select;
1016 st->task.post_select = signal_post_select;
1017 sprintf(st->task.status, "signal task");
1018 }
1019
1020 static void command_pre_select(struct sched *s, struct task *t)
1021 {
1022 struct command_task *ct = container_of(t, struct command_task, task);
1023 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1024 }
1025
1026 static int command_post_select(struct sched *s, struct task *t)
1027 {
1028 int ret;
1029 struct command_task *ct = container_of(t, struct command_task, task);
1030 static struct timeval last_status_dump;
1031 struct timeval tmp, delay;
1032 bool force = true;
1033
1034 ret = handle_connect(ct->fd, &s->rfds);
1035 if (ret < 0)
1036 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1037 else if (ret > 0)
1038 goto dump;
1039
1040 /* if last status dump was less than 500ms ago, do nothing */
1041 delay.tv_sec = 0;
1042 delay.tv_usec = 500 * 1000;
1043 tv_add(&last_status_dump, &delay, &tmp);
1044 if (tv_diff(now, &tmp, NULL) < 0)
1045 return 0;
1046
1047 /*
1048 * If last status dump was more than 5s ago, force update. Otherwise,
1049 * update only those items that have changed.
1050 */
1051 delay.tv_sec = 5;
1052 delay.tv_usec = 0;
1053 tv_add(&last_status_dump, &delay, &tmp);
1054 if (tv_diff(now, &tmp, NULL) < 0)
1055 force = false;
1056 dump:
1057 audiod_status_dump(force);
1058 last_status_dump = *now;
1059 return 1;
1060 }
1061
1062 static void init_command_task(struct command_task *ct)
1063 {
1064 ct->task.pre_select = command_pre_select;
1065 ct->task.post_select = command_post_select;
1066 ct->task.error = 0;
1067 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1068 sprintf(ct->task.status, "command task");
1069 }
1070
1071 static void close_stat_pipe(void)
1072 {
1073 if (!stat_task->ct)
1074 return;
1075 client_close(stat_task->ct);
1076 stat_task->ct = NULL;
1077 clear_and_dump_items();
1078 stat_task->length_seconds = 0;
1079 stat_task->offset_seconds = 0;
1080 stat_task->vss_status = 0;
1081 stat_task->current_audio_format_num = -1;
1082 audiod_status_dump(true);
1083 }
1084
1085 /* avoid busy loop if server is down */
1086 static void set_stat_task_restart_barrier(unsigned seconds)
1087 {
1088 struct timeval delay = {seconds, 0};
1089 tv_add(now, &delay, &stat_task->restart_barrier);
1090 }
1091
1092 static bool must_close_slot(int slot_num)
1093 {
1094 struct slot_info *s = &slot[slot_num];
1095 struct audio_format_info *a = afi + s->format;
1096 int i;
1097
1098 if (s->format < 0)
1099 return false;
1100 if (s->receiver_node && s->receiver_node->task.error >= 0)
1101 return false;
1102 for (i = 0; i < a->num_filters; i++)
1103 if (s->fns && s->fns[i].task.error >= 0)
1104 return false;
1105 if (a->num_writers > 0) {
1106 for (i = 0; i < a->num_writers; i++)
1107 if (s->wns && s->wns[i].task.error >= 0)
1108 return false;
1109 } else {
1110 if (s->wns && s->wns[0].task.error >= 0)
1111 return false;
1112 }
1113 return true;
1114 }
1115
1116 static void close_slot(int slot_num)
1117 {
1118 struct slot_info *s = slot + slot_num;
1119
1120 PARA_INFO_LOG("closing slot %d\n", slot_num);
1121 close_writers(s);
1122 close_filters(s);
1123 close_receiver(slot_num);
1124 clear_slot(slot_num);
1125 }
1126
1127 static void close_unused_slots(void)
1128 {
1129 int i;
1130
1131 FOR_EACH_SLOT(i)
1132 if (must_close_slot(i))
1133 close_slot(i);
1134 }
1135
1136 /**
1137 * Close the connection to para_server and exit.
1138 *
1139 * \param status The exit status which is passed to exit(3).
1140 * \param msg The log message
1141 *
1142 * Log \a msg with loglevel \p EMERG, close the connection to para_server and
1143 * all slots, and call \p exit(status). \a status should be either EXIT_SUCCESS
1144 * or EXIT_FAILURE.
1145 *
1146 * \sa exit(3).
1147 */
1148 void __noreturn clean_exit(int status, const char *msg)
1149 {
1150 int i;
1151
1152 if (socket_name)
1153 unlink(socket_name);
1154 close_stat_pipe();
1155 FOR_EACH_SLOT(i)
1156 close_slot(i);
1157 audiod_cmdline_parser_free(&conf);
1158 close_stat_clients();
1159 PARA_EMERG_LOG("%s\n", msg);
1160 exit(status);
1161 }
1162
1163 /*
1164 * Check if any receivers/filters/writers need to be started and do so if
1165 * necessary.
1166 */
1167 static void start_stop_decoders(void)
1168 {
1169 int ret;
1170 struct slot_info *sl;
1171 struct audio_format_info *a;
1172
1173 close_unused_slots();
1174 if (audiod_status != AUDIOD_ON ||
1175 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1176 return notify_receivers(E_NOT_PLAYING);
1177 if (!must_start_decoder())
1178 return;
1179 ret = open_receiver(stat_task->current_audio_format_num);
1180 if (ret < 0) {
1181 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1182 return;
1183 }
1184 sl = slot + ret;
1185 a = afi + sl->format;
1186 if (a->num_filters)
1187 open_filters(sl);
1188 open_writers(sl);
1189 activate_grab_clients(&sched);
1190 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1191 }
1192
1193 static void status_pre_select(struct sched *s, struct task *t)
1194 {
1195 struct status_task *st = container_of(t, struct status_task, task);
1196 int i, ret, cafn = stat_task->current_audio_format_num;
1197
1198 if (must_start_decoder())
1199 goto min_delay;
1200 FOR_EACH_SLOT(i)
1201 if (must_close_slot(i))
1202 goto min_delay;
1203 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1204 if (ret > 0)
1205 goto min_delay;
1206 if (st->ct && audiod_status == AUDIOD_OFF)
1207 goto min_delay;
1208 if (!st->ct && audiod_status != AUDIOD_OFF)
1209 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1210 if (cafn >= 0)
1211 sched_request_barrier(&afi[cafn].restart_barrier, s);
1212 /*
1213 * If para_server is playing we'd like to have a smooth time display
1214 * even if we are running in standby mode. So we request a timeout that
1215 * expires at the next full second.
1216 */
1217 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1218 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1219 return;
1220 min_delay:
1221 sched_min_delay(s);
1222 }
1223
1224 /* restart the client task if necessary */
1225 static int status_post_select(struct sched *s, struct task *t)
1226 {
1227 struct status_task *st = container_of(t, struct status_task, task);
1228
1229 if (audiod_status == AUDIOD_OFF) {
1230 if (!st->ct)
1231 goto out;
1232 if (st->ct->task.error >= 0) {
1233 task_notify(&st->ct->task, E_AUDIOD_OFF);
1234 goto out;
1235 }
1236 close_stat_pipe();
1237 st->clock_diff_count = conf.clock_diff_count_arg;
1238 goto out;
1239 }
1240 if (st->ct) {
1241 char *buf;
1242 size_t sz;
1243 int ret;
1244
1245 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1246 if (ret < 0) {
1247 close_stat_pipe();
1248 goto out;
1249 }
1250 if (st->ct->status != CL_EXECUTING)
1251 goto out;
1252 if (ret == 0) {
1253 struct timeval diff;
1254 tv_diff(now, &st->last_status_read, &diff);
1255 if (diff.tv_sec > 61)
1256 task_notify(&st->ct->task, E_STATUS_TIMEOUT);
1257 goto out;
1258 }
1259 btr_merge(st->btrn, st->min_iqs);
1260 sz = btr_next_buffer(st->btrn, &buf);
1261 ret = for_each_stat_item(buf, sz, update_item);
1262 if (ret < 0) {
1263 task_notify(&st->ct->task, -ret);
1264 goto out;
1265 }
1266 if (sz != ret) {
1267 btr_consume(st->btrn, sz - ret);
1268 st->last_status_read = *now;
1269 st->min_iqs = 0;
1270 } else /* current status item crosses buffers */
1271 st->min_iqs = sz + 1;
1272 goto out;
1273 }
1274 btr_drain(st->btrn);
1275 st->current_audio_format_num = -1;
1276 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1277 goto out;
1278 if (st->clock_diff_count) { /* get status only one time */
1279 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1280 int argc = 5;
1281 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1282 st->clock_diff_count--;
1283 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1284 set_stat_task_restart_barrier(2);
1285
1286 } else {
1287 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1288 int argc = 4;
1289 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1290 set_stat_task_restart_barrier(5);
1291 }
1292 free(stat_item_values[SI_BASENAME]);
1293 stat_item_values[SI_BASENAME] = para_strdup(
1294 "no connection to para_server");
1295 stat_client_write_item(SI_BASENAME);
1296 st->last_status_read = *now;
1297 out:
1298 start_stop_decoders();
1299 return 0;
1300 }
1301
1302 static void init_status_task(struct status_task *st)
1303 {
1304 memset(st, 0, sizeof(struct status_task));
1305 st->task.pre_select = status_pre_select;
1306 st->task.post_select = status_post_select;
1307 st->sa_time_diff_sign = 1;
1308 st->clock_diff_count = conf.clock_diff_count_arg;
1309 st->current_audio_format_num = -1;
1310 sprintf(st->task.status, "stat");
1311 st->btrn = btr_new_node(&(struct btr_node_description)
1312 EMBRACE(.name = "stat"));
1313 }
1314
1315 static void set_initial_status(void)
1316 {
1317 audiod_status = AUDIOD_ON;
1318 if (!conf.mode_given)
1319 return;
1320 if (!strcmp(conf.mode_arg, "sb")) {
1321 audiod_status = AUDIOD_STANDBY;
1322 return;
1323 }
1324 if (!strcmp(conf.mode_arg, "off")) {
1325 audiod_status = AUDIOD_OFF;
1326 return;
1327 }
1328 if (strcmp(conf.mode_arg, "on"))
1329 PARA_WARNING_LOG("invalid mode\n");
1330 }
1331
1332 __noreturn static void print_help_and_die(void)
1333 {
1334 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1335 bool d = conf.detailed_help_given;
1336 unsigned flags;
1337
1338 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1339 ggo_print_help(&h, flags);
1340
1341 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1342 print_receiver_helps(flags);
1343 print_filter_helps(flags);
1344 print_writer_helps(flags);
1345 exit(0);
1346 }
1347
1348 static void init_colors_or_die(void)
1349 {
1350 int i;
1351
1352 if (!want_colors())
1353 return;
1354 daemon_set_default_log_colors();
1355 daemon_set_flag(DF_COLOR_LOG);
1356 for (i = 0; i < conf.log_color_given; i++)
1357 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1358 }
1359
1360 /**
1361 * the main function of para_audiod
1362 *
1363 * \param argc usual argument count
1364 * \param argv usual argument vector
1365 *
1366 * \return EXIT_SUCCESS or EXIT_FAILURE
1367 *
1368 * \sa para_audiod(1)
1369 * */
1370 int main(int argc, char *argv[])
1371 {
1372 int ret, i;
1373 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1374 struct audiod_cmdline_parser_params params = {
1375 .override = 0,
1376 .initialize = 1,
1377 .check_required = 0,
1378 .check_ambiguity = 0,
1379 .print_errors = 1
1380 };
1381
1382 valid_fd_012();
1383 audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1384 daemon_set_loglevel(conf.loglevel_arg);
1385 version_handle_flag("audiod", conf.version_given);
1386 /* init receivers/filters/writers early to make help work */
1387 recv_init();
1388 filter_init();
1389 writer_init();
1390 if (conf.help_given || conf.detailed_help_given)
1391 print_help_and_die();
1392 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1393 parse_config_or_die();
1394 init_colors_or_die();
1395 init_random_seed_or_die();
1396 daemon_set_flag(DF_LOG_TIME);
1397 daemon_set_flag(DF_LOG_HOSTNAME);
1398 daemon_set_flag(DF_LOG_LL);
1399 if (conf.log_timing_given)
1400 daemon_set_flag(DF_LOG_TIMING);
1401 if (conf.logfile_given) {
1402 daemon_set_logfile(conf.logfile_arg);
1403 daemon_open_log_or_die();
1404 }
1405 ret = parse_stream_args();
1406 if (ret < 0) {
1407 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1408 exit(EXIT_FAILURE);
1409 }
1410 log_welcome("para_audiod");
1411 set_server_start_time(NULL);
1412 set_initial_status();
1413 FOR_EACH_SLOT(i)
1414 clear_slot(i);
1415 setup_signal_handling();
1416 signal_setup_default(sig_task);
1417
1418 init_status_task(stat_task);
1419 init_command_task(cmd_task);
1420
1421 if (conf.daemon_given)
1422 daemonize(false /* parent exits immediately */);
1423
1424 register_task(&sched, &sig_task->task);
1425 register_task(&sched, &cmd_task->task);
1426 register_task(&sched, &stat_task->task);
1427 sched.default_timeout.tv_sec = 2;
1428 sched.default_timeout.tv_usec = 999 * 1000;
1429 ret = schedule(&sched);
1430
1431 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1432 return EXIT_FAILURE;
1433 }