Change year in copyright message to 2012.
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2012 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 "recv.h"
20 #include "buffer_tree.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 /** Defines how audiod handles one supported audio format. */
42 struct audio_format_info {
43 /** pointer to the receiver for this audio format */
44 struct receiver *receiver;
45 /** the receiver configuration */
46 void *receiver_conf;
47 /** the number of filters that should be activated for this audio format */
48 unsigned int num_filters;
49 /** Array of filter numbers to be activated. */
50 unsigned *filter_nums;
51 /** Pointer to the array of filter configurations. */
52 void **filter_conf;
53 /** the number of filters that should be activated for this audio format */
54 unsigned int num_writers;
55 /** Array of writer numbers to be activated. */
56 int *writer_nums;
57 /** pointer to the array of writer configurations */
58 void **writer_conf;
59 /** do not start receiver/filters/writer before this time */
60 struct timeval restart_barrier;
61 };
62
63 /**
64 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
65 * be associated with a receiver/filter/writer triple. This array holds all
66 * information on the status of these slots.
67 *
68 * \sa struct slot_info
69 * */
70 struct slot_info slot[MAX_STREAM_SLOTS];
71
72 /** The vss status flags audiod is interested in. */
73 enum vss_status_flags {
74 /** Whether the 'N' flag is set. */
75 VSS_STATUS_FLAG_NEXT = 1,
76 /** The 'P' flag is set. */
77 VSS_STATUS_FLAG_PLAYING = 2,
78 };
79
80 struct sched sched = {.max_fileno = 0};
81
82 /**
83 * The task for obtaining para_server's status (para_client stat).
84 *
85 * \sa struct task, struct sched.
86 */
87 struct status_task {
88 /** The associated task structure of audiod. */
89 struct task task;
90 /** Client data associated with the stat task. */
91 struct client_task *ct;
92 /** Do not restart client command until this time. */
93 struct timeval restart_barrier;
94 /** Last time we received status data from para_server. */
95 struct timeval last_status_read;
96 size_t min_iqs;
97 /** The offset value announced by para_server. */
98 int offset_seconds;
99 /** The length of the current audio file as announced by para_server. */
100 int length_seconds;
101 /** The start of the current stream from the view of para_server. */
102 struct timeval server_stream_start;
103 /** The average time deviation between para_server and para_audiod. */
104 struct timeval sa_time_diff;
105 /** Whether client time is ahead of server time. */
106 int sa_time_diff_sign;
107 /** The 'P' and the 'N' flags as announced by para_server. */
108 enum vss_status_flags vss_status;
109 /** Number of times the clock difference is to be checked. */
110 unsigned clock_diff_count;
111 /** When to start the next check for clock difference. */
112 struct timeval clock_diff_barrier;
113 /** Number of the audio format as announced by para_server. */
114 int current_audio_format_num;
115 /* The status task btrn is the child of the client task. */
116 struct btr_node *btrn;
117 };
118
119 /** The array of status items sent by para_server. */
120 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
121
122 /**
123 * the current mode of operation of which can be changed by the on/off/cycle
124 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
125 */
126 int audiod_status = AUDIOD_ON;
127
128 /**
129 * the gengetopt args_info struct that holds information on all command line
130 * arguments
131 */
132 struct audiod_args_info conf;
133
134 static char *socket_name;
135 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
136
137 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
138
139 static struct status_task status_task_struct;
140
141 /**
142 * the task that calls the status command of para_server
143 *
144 * \sa struct status_task
145 */
146 static struct status_task *stat_task = &status_task_struct;
147
148 /**
149 * the task for handling audiod commands
150 *
151 * \sa struct task, struct sched
152 */
153 struct command_task {
154 /** the local listening socket */
155 int fd;
156 /** the associated task structure */
157 struct task task;
158 };
159
160 /** iterate over all supported audio formats */
161 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
162
163 /**
164 * Get the audio format number.
165 *
166 * \param name The name of the audio format.
167 *
168 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
169 * \a name is not a supported audio format.
170 */
171 static int get_audio_format_num(const char *name)
172 {
173 int i;
174
175 while (para_isspace(*name))
176 name++;
177 FOR_EACH_AUDIO_FORMAT(i)
178 if (!strcmp(name, audio_formats[i]))
179 return i;
180 return -E_UNSUPPORTED_AUDIO_FORMAT;
181 }
182
183 static int get_matching_audio_format_nums(const char *re)
184 {
185 int i, ret;
186 regex_t preg;
187
188 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
189 if (ret < 0)
190 return ret;
191 ret = 0;
192 FOR_EACH_AUDIO_FORMAT(i)
193 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
194 ret |= (1 << i);
195 regfree(&preg);
196 return ret;
197 }
198
199 /**
200 * Compute the play time based on information of the given slot.
201 *
202 * \param slot_num The slot number (negative means: no slot).
203 *
204 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
205 * from the status items received from para_server and the start time of the
206 * (first) writer of the given slot.
207 *
208 * It has to to take into account that probably the stream was not started at
209 * the beginning of the file, that the clock between the server and the client
210 * host may differ and that playback of the stream was delayed, e.g. because
211 * the prebuffer filter is used in the filter configuration of the given slot.
212 *
213 * If no writer is active in the given slot, or \a slot_num is negative
214 * (indicating that para_audiod runs in standby mode), an approximation based
215 * only on the status items is computed and the returned string is prefixed
216 * with "~".
217 *
218 * \return A string that must be freed by the caller.
219 */
220 char *get_time_string(int slot_num)
221 {
222 int ret, seconds = 0, length;
223 struct timeval *tmp, sum, sss, /* server stream start */
224 rstime, /* receiver start time */
225 wstime, /* writer start time */
226 wtime, /* now - writer start */
227 rskip; /* receiver start - sss */
228 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
229 char *msg;
230
231 if (audiod_status == AUDIOD_OFF)
232 goto empty;
233 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
234 if (stat_task->length_seconds) /* paused */
235 return NULL;
236 goto empty; /* stopped */
237 }
238 if (audiod_status == AUDIOD_ON && !s)
239 goto empty;
240 /*
241 * Valid status items and playing, set length and tmp to the stream
242 * start. We use the slot info and fall back to the info from current
243 * status items if no slot info is available.
244 */
245 length = stat_task->length_seconds;
246 tmp = &stat_task->server_stream_start;
247 if (s && s->wns) { /* writer active in this slot */
248 btr_get_node_start(s->wns[0].btrn, &wstime);
249 if (wstime.tv_sec != 0) { /* writer wrote something */
250 if (s->server_stream_start.tv_sec == 0) {
251 /* copy status info to slot */
252 s->server_stream_start = stat_task->server_stream_start;
253 s->offset_seconds = stat_task->offset_seconds;
254 s->seconds_total = stat_task->length_seconds;
255 }
256 length = s->seconds_total;
257 tmp = &s->server_stream_start;
258 }
259 }
260 if (stat_task->sa_time_diff_sign > 0)
261 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
262 else
263 tv_add(tmp, &stat_task->sa_time_diff, &sss);
264 if (!s || !s->wns) {
265 struct timeval diff;
266 tv_diff(now, &sss, &diff);
267 seconds = diff.tv_sec + stat_task->offset_seconds;
268 goto out;
269 }
270 tv_diff(now, &wstime, &wtime);
271 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
272 seconds = s->offset_seconds;
273 btr_get_node_start(s->receiver_node->btrn, &rstime);
274 ret = tv_diff(&rstime, &sss, &rskip);
275 if (ret > 0) { /* audiod was started in the middle of the stream */
276 tv_add(&wtime, &rskip, &sum);
277 seconds += sum.tv_sec;
278 } else
279 seconds += wtime.tv_sec;
280 out:
281 seconds = PARA_MIN(seconds, length);
282 seconds = PARA_MAX(seconds, 0);
283 msg = make_message(
284 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
285 s? "" : "~",
286 seconds / 60,
287 seconds % 60,
288 (length - seconds) / 60,
289 (length - seconds) % 60,
290 length? (seconds * 100 + length / 2) / length : 0,
291 length / 60,
292 length % 60
293 );
294 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
295 return msg;
296 empty:
297 return para_strdup(NULL);
298 }
299
300 static int want_colors(void)
301 {
302 if (conf.color_arg == color_arg_no)
303 return 0;
304 if (conf.color_arg == color_arg_yes)
305 return 1;
306 if (conf.logfile_given)
307 return 0;
308 return isatty(STDERR_FILENO);
309 }
310
311 static void parse_config_or_die(void)
312 {
313 int ret;
314 char *config_file;
315 struct audiod_cmdline_parser_params params = {
316 .override = 0,
317 .initialize = 0,
318 .check_required = 1,
319 .check_ambiguity = 0,
320 .print_errors = 1
321 };
322
323 if (conf.config_file_given)
324 config_file = para_strdup(conf.config_file_arg);
325 else {
326 char *home = para_homedir();
327 config_file = make_message("%s/.paraslash/audiod.conf", home);
328 free(home);
329 }
330 ret = file_exists(config_file);
331 if (conf.config_file_given && !ret) {
332 PARA_EMERG_LOG("can not read config file %s\n", config_file);
333 goto err;
334 }
335 if (ret)
336 audiod_cmdline_parser_config_file(config_file, &conf, &params);
337 free(config_file);
338 daemon_set_loglevel(conf.loglevel_arg);
339 return;
340 err:
341 free(config_file);
342 exit(EXIT_FAILURE);
343 }
344
345 static void setup_signal_handling(void)
346 {
347 sig_task->fd = para_signal_init();
348 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
349 para_install_sighandler(SIGINT);
350 para_install_sighandler(SIGTERM);
351 para_install_sighandler(SIGHUP);
352 para_sigaction(SIGPIPE, SIG_IGN);
353 }
354
355 static void clear_slot(int slot_num)
356 {
357 struct slot_info *s = &slot[slot_num];
358
359 PARA_INFO_LOG("clearing slot %d\n", slot_num);
360 memset(s, 0, sizeof(struct slot_info));
361 s->format = -1;
362 }
363
364 static void close_receiver(int slot_num)
365 {
366 struct slot_info *s = &slot[slot_num];
367 struct audio_format_info *a;
368
369 if (s->format < 0 || !s->receiver_node)
370 return;
371 a = &afi[s->format];
372 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
373 audio_formats[s->format], slot_num);
374 a->receiver->close(s->receiver_node);
375 btr_free_node(s->receiver_node->btrn);
376 free(s->receiver_node);
377 s->receiver_node = NULL;
378 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
379 &a->restart_barrier);
380 }
381
382 static void writer_cleanup(struct writer_node *wn)
383 {
384 struct writer *w;
385
386 if (!wn)
387 return;
388 w = writers + wn->writer_num;
389 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
390 w->close(wn);
391 btr_free_node(wn->btrn);
392 }
393
394 static void close_writers(struct slot_info *s)
395 {
396 struct audio_format_info *a;
397 int i;
398
399 if (s->format < 0)
400 return;
401 assert(s->wns);
402 a = afi + s->format;
403 if (a->num_writers == 0)
404 writer_cleanup(s->wns);
405 else {
406 for (i = 0; i < a->num_writers; i++)
407 writer_cleanup(s->wns + i);
408 }
409 free(s->wns);
410 s->wns = NULL;
411 }
412
413 static void close_filters(struct slot_info *s)
414 {
415 int i;
416 struct audio_format_info *a = afi + s->format;
417 if (a->num_filters == 0)
418 return;
419 for (i = 0; i < a->num_filters; i++) {
420 struct filter_node *fn = s->fns + i;
421 struct filter *f;
422
423 if (!fn)
424 continue;
425 f = filters + fn->filter_num;
426 if (f->close)
427 f->close(fn);
428 btr_free_node(fn->btrn);
429 }
430 free(s->fns);
431 s->fns = NULL;
432 }
433
434 /*
435 * Whenever a task commits suicide by returning from post_select with t->error
436 * < 0, it also removes its btr node. We do exactly that to kill a running
437 * task. Note that the scheduler checks t->error also _before_ each pre/post
438 * select call, so the victim will never be scheduled again.
439 */
440 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
441 {
442 if (t->error < 0)
443 return;
444 t->error = error;
445 btr_remove_node(btrn);
446 }
447
448 static void kill_all_decoders(int error)
449 {
450 int i;
451
452 FOR_EACH_SLOT(i) {
453 struct slot_info *s = slot + i;
454 if (s->format < 0)
455 continue;
456 if (!s->receiver_node)
457 continue;
458 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
459 error);
460 }
461 }
462
463 static int get_empty_slot(void)
464 {
465 int i;
466 struct slot_info *s;
467
468 FOR_EACH_SLOT(i) {
469 s = &slot[i];
470 if (s->format < 0) {
471 clear_slot(i);
472 return i;
473 }
474 if (s->wns || s->receiver_node || s->fns)
475 continue;
476 clear_slot(i);
477 return i;
478 }
479 return -E_NO_MORE_SLOTS;
480 }
481
482 static void open_filters(struct slot_info *s)
483 {
484 struct audio_format_info *a = afi + s->format;
485 struct filter_node *fn;
486 int nf = a->num_filters;
487 struct btr_node *parent;
488 int i;
489
490 if (nf == 0)
491 return;
492 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
493 assert(s->fns == NULL);
494 s->fns = para_calloc(nf * sizeof(struct filter_node));
495 parent = s->receiver_node->btrn;
496 for (i = 0; i < nf; i++) {
497 struct filter *f = filters + a->filter_nums[i];
498 fn = s->fns + i;
499 fn->filter_num = a->filter_nums[i];
500 fn->conf = a->filter_conf[i];
501 fn->task.pre_select = f->pre_select;
502 fn->task.post_select = f->post_select;
503
504 fn->btrn = btr_new_node(&(struct btr_node_description)
505 EMBRACE(.name = f->name, .parent = parent,
506 .handler = f->execute, .context = fn));
507
508 f->open(fn);
509 register_task(&sched, &fn->task);
510 parent = fn->btrn;
511 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
512 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
513 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
514 }
515 }
516
517 static void open_writers(struct slot_info *s)
518 {
519 int i;
520 struct audio_format_info *a = afi + s->format;
521 struct writer_node *wn;
522 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
523
524 assert(s->wns == NULL);
525 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
526 * sizeof(struct writer_node));
527 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
528 for (i = 0; i < a->num_writers; i++) {
529 wn = s->wns + i;
530 wn->conf = a->writer_conf[i];
531 wn->writer_num = a->writer_nums[i];
532 register_writer_node(wn, parent, &sched);
533 }
534 }
535
536 /* returns slot num on success */
537 static int open_receiver(int format)
538 {
539 struct audio_format_info *a = &afi[format];
540 struct slot_info *s;
541 int ret, slot_num;
542 struct receiver *r = a->receiver;
543 struct receiver_node *rn;
544
545 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
546 ret = get_empty_slot();
547 if (ret < 0)
548 return ret;
549 slot_num = ret;
550 rn = para_calloc(sizeof(*rn));
551 rn->receiver = r;
552 rn->conf = a->receiver_conf;
553 rn->btrn = btr_new_node(&(struct btr_node_description)
554 EMBRACE(.name = r->name, .context = rn));
555 ret = r->open(rn);
556 if (ret < 0) {
557 btr_free_node(rn->btrn);
558 free(rn);
559 return ret;
560 }
561 s = &slot[slot_num];
562 s->format = format;
563 s->receiver_node = rn;
564 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
565 audio_formats[format], r->name, slot_num);
566 rn->task.pre_select = r->pre_select;
567 rn->task.post_select = r->post_select;
568 sprintf(rn->task.status, "%s receiver node", r->name);
569 register_task(&sched, &rn->task);
570 return slot_num;
571 }
572
573 static bool receiver_running(void)
574 {
575 int i;
576 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
577
578 FOR_EACH_SLOT(i) {
579 struct slot_info *s = &slot[i];
580 long unsigned ss2 = s->server_stream_start.tv_sec;
581
582 if (!s->receiver_node)
583 continue;
584 if (s->receiver_node->task.error >= 0)
585 return true;
586 if (ss1 == ss2)
587 return true;
588 }
589 return false;
590 }
591
592 /**
593 * Return the root node of the current buffer tree.
594 *
595 * This is only used for stream grabbing.
596 *
597 * \return \p NULL if no slot is currently active. If more than one buffer tree
598 * exists, the node corresponding to the most recently started receiver is
599 * returned.
600 */
601 struct btr_node *audiod_get_btr_root(void)
602 {
603 int i, newest_slot = -1;
604 struct timeval newest_rstime = {0, 0};
605
606 FOR_EACH_SLOT(i) {
607 struct slot_info *s = &slot[i];
608 struct timeval rstime;
609 if (!s->receiver_node)
610 continue;
611 if (s->receiver_node->task.error < 0)
612 continue;
613 btr_get_node_start(s->receiver_node->btrn, &rstime);
614 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
615 continue;
616 newest_rstime = rstime;
617 newest_slot = i;
618 }
619 if (newest_slot == -1)
620 return NULL;
621 return slot[newest_slot].receiver_node->btrn;
622 }
623
624 /* whether a new instance of a decoder should be started. */
625 static bool must_start_decoder(void)
626 {
627 int cafn = stat_task->current_audio_format_num;
628 unsigned vs = stat_task->vss_status;
629
630 if (audiod_status != AUDIOD_ON)
631 return false;
632 if (cafn < 0)
633 return false;
634 if (!stat_task->ct)
635 return false;
636 if (vs & VSS_STATUS_FLAG_NEXT)
637 return false;
638 if (!(vs & VSS_STATUS_FLAG_PLAYING))
639 return false;
640 if (receiver_running())
641 return false;
642 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
643 return false;
644 return true;
645 }
646
647 static unsigned compute_time_diff(const struct timeval *status_time)
648 {
649 struct timeval tmp, diff;
650 static unsigned count;
651 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
652 const struct timeval max_deviation = {0, 500 * 1000};
653 const int time_smooth = 5;
654
655 if (!status_time)
656 return count;
657 sign = tv_diff(status_time, now, &diff);
658 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
659 // sign, sa_time_diff_sign);
660 if (!count) {
661 sa_time_diff_sign = sign;
662 stat_task->sa_time_diff = diff;
663 count++;
664 goto out;
665 }
666 if (count > 5) {
667 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
668 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
669 PARA_WARNING_LOG("time diff jump: %lims\n",
670 s * tv2ms(&tmp));
671 }
672 count++;
673 sa_time_diff_sign = tv_convex_combination(
674 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
675 count > 10? sign : sign * time_smooth, &diff,
676 &tmp);
677 stat_task->sa_time_diff = tmp;
678 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
679 sign < 0? "-" : "+",
680 tv2ms(&diff),
681 sa_time_diff_sign < 0? "-" : "+",
682 tv2ms(&stat_task->sa_time_diff)
683 );
684 out:
685 stat_task->sa_time_diff_sign = sa_time_diff_sign;
686 return count;
687 }
688
689 static int update_item(int itemnum, char *buf)
690 {
691 long unsigned sec, usec;
692
693 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
694 return 1;
695 free(stat_item_values[itemnum]);
696 stat_item_values[itemnum] = para_strdup(buf);
697 stat_client_write_item(itemnum);
698 switch (itemnum) {
699 case SI_STATUS_FLAGS:
700 stat_task->vss_status = 0;
701 if (strchr(buf, 'N'))
702 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
703 if (strchr(buf, 'P'))
704 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
705 break;
706 case SI_OFFSET:
707 stat_task->offset_seconds = atoi(buf);
708 break;
709 case SI_SECONDS_TOTAL:
710 stat_task->length_seconds = atoi(buf);
711 break;
712 case SI_STREAM_START:
713 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
714 stat_task->server_stream_start.tv_sec = sec;
715 stat_task->server_stream_start.tv_usec = usec;
716 }
717 break;
718 case SI_CURRENT_TIME:
719 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
720 struct timeval tv = {sec, usec};
721 compute_time_diff(&tv);
722 }
723 break;
724 case SI_FORMAT:
725 stat_task->current_audio_format_num
726 = get_audio_format_num(buf);
727 }
728 return 1;
729 }
730
731 static int parse_stream_command(const char *txt, char **cmd)
732 {
733 int ret, len;
734 char *re, *p = strchr(txt, ':');
735
736 if (!p)
737 return -E_MISSING_COLON;
738 *cmd = p + 1;
739 len = p - txt;
740 re = malloc(len + 1);
741 strncpy(re, txt, len);
742 re[len] = '\0';
743 ret = get_matching_audio_format_nums(re);
744 free(re);
745 return ret;
746 }
747
748 static int add_filter(int format, char *cmdline)
749 {
750 struct audio_format_info *a = &afi[format];
751 int filter_num, nf = a->num_filters;
752 void *cfg;
753
754 filter_num = check_filter_arg(cmdline, &cfg);
755 if (filter_num < 0)
756 return filter_num;
757 a->filter_conf = para_realloc(a->filter_conf,
758 (nf + 1) * sizeof(void *));
759 a->filter_nums = para_realloc(a->filter_nums,
760 (nf + 1) * sizeof(unsigned));
761 a->filter_nums[nf] = filter_num;
762 a->filter_conf[nf] = cfg;
763 a->num_filters++;
764 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
765 filters[filter_num].name);
766 return filter_num;
767 }
768
769 static int parse_writer_args(void)
770 {
771 int i, ret;
772 char *cmd;
773 struct audio_format_info *a;
774
775 for (i = 0; i < conf.writer_given; i++) {
776 void *wconf;
777 int j, nw, writer_num, af_mask;
778
779 ret = parse_stream_command(conf.writer_arg[i], &cmd);
780 if (ret < 0)
781 return ret;
782 af_mask = ret;
783 FOR_EACH_AUDIO_FORMAT(j) {
784 a = afi + j;
785 if ((af_mask & (1 << j)) == 0) /* no match */
786 continue;
787 wconf = check_writer_arg_or_die(cmd, &writer_num);
788 nw = a->num_writers;
789 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
790 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
791 a->writer_nums[nw] = writer_num;
792 a->writer_conf[nw] = wconf;
793 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
794 nw, writer_names[writer_num]);
795 a->num_writers++;
796 }
797 }
798 /* Use default writer for audio formats which are not yet set up. */
799 FOR_EACH_AUDIO_FORMAT(i) {
800 struct writer *w = writers + DEFAULT_WRITER;
801 a = afi + i;
802 if (a->num_writers > 0)
803 continue; /* already set up */
804 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
805 writer_names[DEFAULT_WRITER]);
806 a->writer_nums = para_malloc(sizeof(int));
807 a->writer_nums[0] = DEFAULT_WRITER;
808 a->writer_conf = para_malloc(sizeof(void *));
809 a->writer_conf[0] = w->parse_config_or_die("");
810 a->num_writers = 1;
811 }
812 return 1;
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;
823 int j, af_mask;
824
825 ret = parse_stream_command(conf.receiver_arg[i], &arg);
826 if (ret < 0)
827 goto out;
828 af_mask = ret;
829 FOR_EACH_AUDIO_FORMAT(j) {
830 a = afi + j;
831 if ((af_mask & (1 << j)) == 0) /* no match */
832 continue;
833 /*
834 * If multiple receivers are given for this audio format, the
835 * last one wins and we have to free the previous receiver
836 * config here. Since we are iterating backwards, the winning
837 * receiver arg is in fact the first one given.
838 */
839 if (a->receiver_conf)
840 a->receiver->free_config(a->receiver_conf);
841 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
842 ret = -E_RECV_SYNTAX;
843 if (!a->receiver_conf)
844 goto out;
845 a->receiver = receivers + receiver_num;
846 }
847 }
848 /*
849 * Use the first available receiver with no arguments for those audio
850 * formats for which no receiver was specified.
851 */
852 cmd = para_strdup(receivers[0].name);
853 FOR_EACH_AUDIO_FORMAT(i) {
854 a = &afi[i];
855 if (a->receiver_conf)
856 continue;
857 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
858 if (!a->receiver_conf)
859 return -E_RECV_SYNTAX;
860 a->receiver = &receivers[receiver_num];
861 }
862 FOR_EACH_AUDIO_FORMAT(i) {
863 a = afi + i;
864 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
865 audio_formats[i], a->receiver->name);
866 }
867 ret = 1;
868 out:
869 free(cmd);
870 return ret;
871 }
872
873 static int init_default_filters(void)
874 {
875 int i, ret = 1;
876
877 FOR_EACH_AUDIO_FORMAT(i) {
878 struct audio_format_info *a = &afi[i];
879 char *tmp;
880 int j;
881
882 if (a->num_filters)
883 continue; /* no default -- nothing to to */
884 /*
885 * udp and dccp streams are fec-encoded, so add fecdec as the
886 * first filter.
887 */
888 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
889 strcmp(afi[i].receiver->name, "dccp") == 0) {
890 tmp = para_strdup("fecdec");
891 add_filter(i, tmp);
892 free(tmp);
893 if (ret < 0)
894 goto out;
895 }
896 /* add "dec" to audio format name */
897 tmp = make_message("%sdec", audio_formats[i]);
898 for (j = 0; filters[j].name; j++)
899 if (!strcmp(tmp, filters[j].name))
900 break;
901 free(tmp);
902 ret = -E_UNSUPPORTED_FILTER;
903 if (!filters[j].name)
904 goto out;
905 tmp = para_strdup(filters[j].name);
906 ret = add_filter(i, tmp);
907 free(tmp);
908 if (ret < 0)
909 goto out;
910 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
911 filters[j].name);
912 }
913 out:
914 return ret;
915 }
916
917 static int parse_filter_args(void)
918 {
919 int i, j, ret, af_mask;
920
921 if (!conf.no_default_filters_given)
922 return init_default_filters();
923 for (i = 0; i < conf.filter_given; i++) {
924 char *arg;
925 ret = parse_stream_command(conf.filter_arg[i], &arg);
926 if (ret < 0)
927 goto out;
928 af_mask = ret;
929 FOR_EACH_AUDIO_FORMAT(j) {
930 if ((af_mask & (1 << j)) == 0) /* no match */
931 continue;
932 ret = add_filter(j, arg);
933 if (ret < 0)
934 goto out;
935 }
936 }
937 ret = init_default_filters(); /* use default values for the rest */
938 out:
939 return ret;
940 }
941
942 static int parse_stream_args(void)
943 {
944 int ret;
945
946 ret = parse_receiver_args();
947 if (ret < 0)
948 return ret;
949 ret = parse_filter_args();
950 if (ret < 0)
951 return ret;
952 ret = parse_writer_args();
953 if (ret < 0)
954 return ret;
955 return 1;
956 }
957
958 /* does not unlink socket on errors */
959 static int audiod_get_socket(void)
960 {
961 struct sockaddr_un unix_addr;
962 int ret, fd;
963
964 if (conf.socket_given)
965 socket_name = para_strdup(conf.socket_arg);
966 else {
967 char *hn = para_hostname();
968 socket_name = make_message("/var/paraslash/audiod_socket.%s",
969 hn);
970 free(hn);
971 }
972 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
973 if (conf.force_given)
974 unlink(socket_name);
975 ret = create_local_socket(socket_name, &unix_addr,
976 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
977 if (ret < 0)
978 goto err;
979 fd = ret;
980 if (listen(fd , 5) < 0) {
981 ret = -ERRNO_TO_PARA_ERROR(errno);
982 goto err;
983 }
984 ret = mark_fd_nonblocking(fd);
985 if (ret < 0)
986 goto err;
987 return fd;
988 err:
989 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
990 exit(EXIT_FAILURE);
991 }
992
993 static void signal_pre_select(struct sched *s, struct task *t)
994 {
995 struct signal_task *st = container_of(t, struct signal_task, task);
996 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
997 }
998
999 static void signal_post_select(struct sched *s, __a_unused struct task *t)
1000 {
1001 int signum;
1002
1003 signum = para_next_signal(&s->rfds);
1004 switch (signum) {
1005 case SIGINT:
1006 case SIGTERM:
1007 case SIGHUP:
1008 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1009 clean_exit(EXIT_FAILURE, "caught deadly signal");
1010 }
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 void 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 = {0, 500 * 1000};
1032
1033 tv_add(&last_status_dump, &delay, &tmp);
1034 if (tv_diff(&tmp, now, NULL) < 0) {
1035 audiod_status_dump();
1036 last_status_dump = *now;
1037 }
1038
1039 ret = handle_connect(ct->fd, &s->rfds);
1040 if (ret < 0)
1041 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1042 audiod_status_dump();
1043 }
1044
1045 static void init_command_task(struct command_task *ct)
1046 {
1047 ct->task.pre_select = command_pre_select;
1048 ct->task.post_select = command_post_select;
1049 ct->task.error = 0;
1050 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1051 sprintf(ct->task.status, "command task");
1052 }
1053
1054 static void close_stat_pipe(void)
1055 {
1056 if (!stat_task->ct)
1057 return;
1058 client_close(stat_task->ct);
1059 stat_task->ct = NULL;
1060 clear_and_dump_items();
1061 stat_task->length_seconds = 0;
1062 stat_task->offset_seconds = 0;
1063 stat_task->vss_status = 0;
1064 stat_task->current_audio_format_num = -1;
1065 audiod_status_dump();
1066 }
1067
1068 /**
1069 * close the connection to para_server and exit
1070 *
1071 * \param status the exit status which is passed to exit(3)
1072 * \param msg the log message
1073 *
1074 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1075 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1076 * EXIT_FAILURE.
1077 *
1078 * \sa exit(3)
1079 */
1080 void __noreturn clean_exit(int status, const char *msg)
1081 {
1082 PARA_EMERG_LOG("%s\n", msg);
1083 if (socket_name)
1084 unlink(socket_name);
1085 close_stat_pipe();
1086 exit(status);
1087 }
1088
1089 /* avoid busy loop if server is down */
1090 static void set_stat_task_restart_barrier(unsigned seconds)
1091 {
1092 struct timeval delay = {seconds, 0};
1093 tv_add(now, &delay, &stat_task->restart_barrier);
1094 }
1095
1096 static void try_to_close_slot(int slot_num)
1097 {
1098 struct slot_info *s = &slot[slot_num];
1099 struct audio_format_info *a = afi + s->format;
1100 int i;
1101
1102 if (s->format < 0)
1103 return;
1104 if (s->receiver_node && s->receiver_node->task.error >= 0)
1105 return;
1106 for (i = 0; i < a->num_filters; i++)
1107 if (s->fns && s->fns[i].task.error >= 0)
1108 return;
1109 if (a->num_writers > 0) {
1110 for (i = 0; i < a->num_writers; i++)
1111 if (s->wns && s->wns[i].task.error >= 0)
1112 return;
1113 } else {
1114 if (s->wns && s->wns[0].task.error >= 0)
1115 return;
1116 }
1117 PARA_INFO_LOG("closing slot %d\n", slot_num);
1118 close_writers(s);
1119 close_filters(s);
1120 close_receiver(slot_num);
1121 clear_slot(slot_num);
1122 }
1123
1124 /*
1125 * Check if any receivers/filters/writers need to be started and do so if
1126 * necessary.
1127 */
1128 static void start_stop_decoders(void)
1129 {
1130 int i, ret;
1131 struct slot_info *sl;
1132 struct audio_format_info *a;
1133
1134 FOR_EACH_SLOT(i)
1135 try_to_close_slot(i);
1136 if (audiod_status != AUDIOD_ON ||
1137 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1138 return kill_all_decoders(-E_NOT_PLAYING);
1139 if (!must_start_decoder())
1140 return;
1141 ret = open_receiver(stat_task->current_audio_format_num);
1142 if (ret < 0) {
1143 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1144 return;
1145 }
1146 sl = slot + ret;
1147 a = afi + sl->format;
1148 if (a->num_filters)
1149 open_filters(sl);
1150 open_writers(sl);
1151 activate_grab_clients(&sched);
1152 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1153 }
1154
1155 static void status_pre_select(struct sched *s, struct task *t)
1156 {
1157 struct status_task *st = container_of(t, struct status_task, task);
1158 int ret, cafn = stat_task->current_audio_format_num;
1159
1160 if (must_start_decoder())
1161 goto min_delay;
1162 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1163 if (ret > 0)
1164 goto min_delay;
1165 if (st->ct && audiod_status == AUDIOD_OFF)
1166 goto min_delay;
1167 if (!st->ct && audiod_status != AUDIOD_OFF)
1168 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1169 if (cafn >= 0)
1170 sched_request_barrier(&afi[cafn].restart_barrier, s);
1171 /*
1172 * If para_server is playing we'd like to have a smooth time display
1173 * even if we are running in standby mode. So we request a timeout that
1174 * expires at the next full second.
1175 */
1176 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1177 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1178 return;
1179 min_delay:
1180 sched_min_delay(s);
1181 }
1182
1183 /* restart the client task if necessary */
1184 static void status_post_select(struct sched *s, struct task *t)
1185 {
1186 struct status_task *st = container_of(t, struct status_task, task);
1187
1188 if (audiod_status == AUDIOD_OFF) {
1189 if (!st->ct)
1190 goto out;
1191 if (st->ct->task.error >= 0) {
1192 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1193 goto out;
1194 }
1195 if (st->ct->task.error >= 0)
1196 goto out;
1197 close_stat_pipe();
1198 st->clock_diff_count = conf.clock_diff_count_arg;
1199 goto out;
1200 }
1201 if (st->ct) {
1202 char *buf;
1203 size_t sz;
1204 int ret;
1205 if (st->ct->task.error < 0) {
1206 if (st->ct->task.error >= 0)
1207 goto out;
1208 close_stat_pipe();
1209 goto out;
1210 }
1211 if (st->ct->status != CL_RECEIVING)
1212 goto out;
1213 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1214 if (ret <= 0) {
1215 struct timeval diff;
1216 tv_diff(now, &st->last_status_read, &diff);
1217 if (diff.tv_sec > 61)
1218 kill_btrn(st->ct->btrn, &st->ct->task,
1219 -E_STATUS_TIMEOUT);
1220 goto out;
1221 }
1222 btr_merge(st->btrn, st->min_iqs);
1223 sz = btr_next_buffer(st->btrn, &buf);
1224 ret = for_each_stat_item(buf, sz, update_item);
1225 if (ret < 0) {
1226 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1227 goto out;
1228 }
1229 if (sz != ret) {
1230 btr_consume(st->btrn, sz - ret);
1231 st->last_status_read = *now;
1232 st->min_iqs = 0;
1233 } else /* current status item crosses buffers */
1234 st->min_iqs = sz + 1;
1235 goto out;
1236 }
1237 btr_drain(st->btrn);
1238 st->current_audio_format_num = -1;
1239 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1240 goto out;
1241 if (st->clock_diff_count) { /* get status only one time */
1242 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1243 int argc = 5;
1244 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1245 st->clock_diff_count--;
1246 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1247 set_stat_task_restart_barrier(2);
1248
1249 } else {
1250 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1251 int argc = 4;
1252 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1253 set_stat_task_restart_barrier(5);
1254 }
1255 free(stat_item_values[SI_BASENAME]);
1256 stat_item_values[SI_BASENAME] = para_strdup(
1257 "no connection to para_server");
1258 stat_client_write_item(SI_BASENAME);
1259 st->last_status_read = *now;
1260 out:
1261 start_stop_decoders();
1262 }
1263
1264 static void init_status_task(struct status_task *st)
1265 {
1266 memset(st, 0, sizeof(struct status_task));
1267 st->task.pre_select = status_pre_select;
1268 st->task.post_select = status_post_select;
1269 st->sa_time_diff_sign = 1;
1270 st->clock_diff_count = conf.clock_diff_count_arg;
1271 st->current_audio_format_num = -1;
1272 sprintf(st->task.status, "stat");
1273 st->btrn = btr_new_node(&(struct btr_node_description)
1274 EMBRACE(.name = "stat"));
1275 }
1276
1277 static void set_initial_status(void)
1278 {
1279 audiod_status = AUDIOD_ON;
1280 if (!conf.mode_given)
1281 return;
1282 if (!strcmp(conf.mode_arg, "sb")) {
1283 audiod_status = AUDIOD_STANDBY;
1284 return;
1285 }
1286 if (!strcmp(conf.mode_arg, "off")) {
1287 audiod_status = AUDIOD_OFF;
1288 return;
1289 }
1290 if (strcmp(conf.mode_arg, "on"))
1291 PARA_WARNING_LOG("invalid mode\n");
1292 }
1293
1294 __noreturn static void print_help_and_die(void)
1295 {
1296 int d = conf.detailed_help_given;
1297 const char **p = d? audiod_args_info_detailed_help
1298 : audiod_args_info_help;
1299
1300 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1301 AUDIOD_CMDLINE_PARSER_VERSION);
1302 printf_or_die("%s\n\n", audiod_args_info_usage);
1303 for (; *p; p++)
1304 printf_or_die("%s\n", *p);
1305 print_receiver_helps(d);
1306 print_filter_helps(d);
1307 print_writer_helps(d);
1308 exit(0);
1309 }
1310
1311 static void init_colors_or_die(void)
1312 {
1313 int i;
1314
1315 if (!want_colors())
1316 return;
1317 daemon_set_default_log_colors();
1318 daemon_set_flag(DF_COLOR_LOG);
1319 for (i = 0; i < conf.log_color_given; i++)
1320 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1321 }
1322
1323 /**
1324 * the main function of para_audiod
1325 *
1326 * \param argc usual argument count
1327 * \param argv usual argument vector
1328 *
1329 * \return EXIT_SUCCESS or EXIT_FAILURE
1330 *
1331 * \sa para_audiod(1)
1332 * */
1333 int main(int argc, char *argv[])
1334 {
1335 int ret, i;
1336 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1337 struct audiod_cmdline_parser_params params = {
1338 .override = 0,
1339 .initialize = 1,
1340 .check_required = 0,
1341 .check_ambiguity = 0,
1342 .print_errors = 1
1343 };
1344
1345 valid_fd_012();
1346 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1347 exit(EXIT_FAILURE);
1348 HANDLE_VERSION_FLAG("audiod", conf);
1349 /* init receivers/filters/writers early to make help work */
1350 recv_init();
1351 filter_init();
1352 writer_init();
1353 if (conf.help_given || conf.detailed_help_given)
1354 print_help_and_die();
1355 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1356 parse_config_or_die();
1357 init_colors_or_die();
1358 init_random_seed_or_die();
1359 daemon_set_flag(DF_LOG_TIME);
1360 daemon_set_flag(DF_LOG_HOSTNAME);
1361 daemon_set_flag(DF_LOG_LL);
1362 if (conf.log_timing_given)
1363 daemon_set_flag(DF_LOG_TIMING);
1364 if (conf.logfile_given) {
1365 daemon_set_logfile(conf.logfile_arg);
1366 daemon_open_log_or_die();
1367 }
1368 ret = parse_stream_args();
1369 if (ret < 0) {
1370 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1371 exit(EXIT_FAILURE);
1372 }
1373 log_welcome("para_audiod");
1374 set_server_start_time(NULL);
1375 set_initial_status();
1376 FOR_EACH_SLOT(i)
1377 clear_slot(i);
1378 setup_signal_handling();
1379 signal_setup_default(sig_task);
1380
1381 init_status_task(stat_task);
1382 init_command_task(cmd_task);
1383
1384 if (conf.daemon_given)
1385 daemonize(false /* parent exits immediately */);
1386
1387 register_task(&sched, &sig_task->task);
1388 register_task(&sched, &cmd_task->task);
1389 register_task(&sched, &stat_task->task);
1390 sched.default_timeout.tv_sec = 2;
1391 sched.default_timeout.tv_usec = 999 * 1000;
1392 ret = schedule(&sched);
1393
1394 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1395 return EXIT_FAILURE;
1396 }