Merge branch 'refs/heads/t/abtract_sockets'
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c The paraslash's audio daemon. */
8
9 #include <netinet/in.h>
10 #include <sys/socket.h>
11 #include <regex.h>
12 #include <sys/types.h>
13 #include <arpa/inet.h>
14 #include <sys/un.h>
15 #include <netdb.h>
16 #include <signal.h>
17
18 #include "para.h"
19 #include "error.h"
20 #include "crypt.h"
21 #include "audiod.cmdline.h"
22 #include "list.h"
23 #include "sched.h"
24 #include "ggo.h"
25 #include "buffer_tree.h"
26 #include "recv.h"
27 #include "filter.h"
28 #include "grab_client.h"
29 #include "client.cmdline.h"
30 #include "client.h"
31 #include "audiod.h"
32 #include "net.h"
33 #include "daemon.h"
34 #include "string.h"
35 #include "fd.h"
36 #include "write.h"
37 #include "write_common.h"
38 #include "signal.h"
39 #include "version.h"
40
41 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
42 /** define the array of error lists needed by para_audiod */
43 INIT_AUDIOD_ERRLISTS;
44 /** define the array containing all supported audio formats */
45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
46
47 DEFINE_RECEIVER_ARRAY;
48
49 /** Defines how audiod handles one supported audio format. */
50 struct audio_format_info {
51 /** pointer to the receiver for this audio format */
52 struct receiver *receiver;
53 /** the receiver configuration */
54 void *receiver_conf;
55 /** the number of filters that should be activated for this audio format */
56 unsigned int num_filters;
57 /** Array of filter numbers to be activated. */
58 unsigned *filter_nums;
59 /** Pointer to the array of filter configurations. */
60 void **filter_conf;
61 /** the number of filters that should be activated for this audio format */
62 unsigned int num_writers;
63 /** Array of writer numbers to be activated. */
64 int *writer_nums;
65 /** pointer to the array of writer configurations */
66 void **writer_conf;
67 /** do not start receiver/filters/writer before this time */
68 struct timeval restart_barrier;
69 };
70
71 /**
72 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
73 * be associated with a receiver/filter/writer triple. This array holds all
74 * information on the status of these slots.
75 *
76 * \sa struct slot_info
77 * */
78 struct slot_info slot[MAX_STREAM_SLOTS];
79
80 /** The vss status flags audiod is interested in. */
81 enum vss_status_flags {
82 /** Whether the 'N' flag is set. */
83 VSS_STATUS_FLAG_NEXT = 1,
84 /** The 'P' flag is set. */
85 VSS_STATUS_FLAG_PLAYING = 2,
86 };
87
88 /**
89 * The scheduler instance of para_audiod.
90 *
91 * This is needed also in audiod_command.c (for the tasks command), so it can
92 * not be made static.
93 */
94 struct sched sched = {.max_fileno = 0};
95
96 /* The task for obtaining para_server's status (para_client stat). */
97 struct status_task {
98 /** The associated task structure of audiod. */
99 struct task *task;
100 /** Client data associated with the stat task. */
101 struct client_task *ct;
102 /** Do not restart client command until this time. */
103 struct timeval restart_barrier;
104 /** Last time we received status data from para_server. */
105 struct timeval last_status_read;
106 size_t min_iqs;
107 /** The offset value announced by para_server. */
108 int offset_seconds;
109 /** The length of the current audio file as announced by para_server. */
110 int length_seconds;
111 /** The start of the current stream from the view of para_server. */
112 struct timeval server_stream_start;
113 /** The average time deviation between para_server and para_audiod. */
114 struct timeval sa_time_diff;
115 /** Whether client time is ahead of server time. */
116 int sa_time_diff_sign;
117 /** The 'P' and the 'N' flags as announced by para_server. */
118 enum vss_status_flags vss_status;
119 /** Number of times the clock difference is to be checked. */
120 unsigned clock_diff_count;
121 /** When to start the next check for clock difference. */
122 struct timeval clock_diff_barrier;
123 /** Number of the audio format as announced by para_server. */
124 int current_audio_format_num;
125 /* The status task btrn is the child of the client task. */
126 struct btr_node *btrn;
127 };
128
129 /** The array of status items sent by para_server. */
130 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
131
132 /**
133 * the current mode of operation of which can be changed by the on/off/cycle
134 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
135 */
136 int audiod_status = AUDIOD_ON;
137
138 /**
139 * the gengetopt args_info struct that holds information on all command line
140 * arguments
141 */
142 struct audiod_args_info conf;
143
144 static char *socket_name;
145 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
146
147 static struct signal_task *signal_task;
148
149 static struct status_task status_task_struct;
150
151 /**
152 * the task that calls the status command of para_server
153 *
154 * \sa struct status_task
155 */
156 static struct status_task *stat_task = &status_task_struct;
157
158 /*
159 * The task for handling audiod commands.
160 *
161 * We need two listening sockets for backward compability: on Linux systems
162 * fd[0] is an abstract socket (more precisely, a socket bound to an address in
163 * the abstract namespace), and fd[1] is the usual pathname socket. On other
164 * systems, fd[0] is negative, and only the pathname socket is used.
165 *
166 * For 0.5.x we accept connections on both sockets to make sure that old
167 * para_audioc versions can still connect. New versions use only the abstract
168 * socket. Hence after v0.6.0 we can go back to a single socket, either an
169 * abstract one (Linux) or a pathname socket (all other systems).
170 */
171 struct command_task {
172 /** The local listening sockets. */
173 int fd[2];
174 /** the associated task structure */
175 struct task *task;
176 };
177
178 /** iterate over all supported audio formats */
179 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
180
181 /**
182 * Get the audio format number.
183 *
184 * \param name The name of the audio format.
185 *
186 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
187 * \a name is not a supported audio format.
188 */
189 static int get_audio_format_num(const char *name)
190 {
191 int i;
192
193 while (para_isspace(*name))
194 name++;
195 FOR_EACH_AUDIO_FORMAT(i)
196 if (!strcmp(name, audio_formats[i]))
197 return i;
198 return -E_UNSUPPORTED_AUDIO_FORMAT;
199 }
200
201 static int get_matching_audio_format_nums(const char *re)
202 {
203 int i, ret;
204 regex_t preg;
205
206 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
207 if (ret < 0)
208 return ret;
209 ret = 0;
210 FOR_EACH_AUDIO_FORMAT(i)
211 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
212 ret |= (1 << i);
213 regfree(&preg);
214 return ret;
215 }
216
217 /**
218 * Compute the play time based on information of the given slot.
219 *
220 * \param slot_num The slot number (negative means: no slot).
221 *
222 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
223 * from the status items received from para_server and the start time of the
224 * (first) writer of the given slot.
225 *
226 * It has to take into account that the stream was probably not started at
227 * the beginning of the file, that the clock between the server and the client
228 * host may differ and that playback of the stream was delayed, e.g. because
229 * the prebuffer filter is used in the filter configuration of the given slot.
230 *
231 * If no writer is active in the given slot, or \a slot_num is negative
232 * (indicating that para_audiod runs in standby mode), an approximation based
233 * only on the status items is computed and the returned string is prefixed
234 * with "~".
235 *
236 * \return A string that must be freed by the caller.
237 */
238 char *get_time_string(int slot_num)
239 {
240 int ret, seconds = 0, length;
241 struct timeval *tmp, sum, sss, /* server stream start */
242 rstime, /* receiver start time */
243 wstime, /* writer start time */
244 wtime, /* now - writer start */
245 rskip; /* receiver start - sss */
246 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
247 char *msg;
248
249 if (audiod_status == AUDIOD_OFF)
250 goto empty;
251 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
252 if (stat_task->length_seconds) /* paused */
253 return NULL;
254 goto empty; /* stopped */
255 }
256 if (audiod_status == AUDIOD_ON && !s)
257 goto empty;
258 /*
259 * Valid status items and playing, set length and tmp to the stream
260 * start. We use the slot info and fall back to the info from current
261 * status items if no slot info is available.
262 */
263 length = stat_task->length_seconds;
264 tmp = &stat_task->server_stream_start;
265 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
266 btr_get_node_start(s->wns[0].btrn, &wstime);
267 if (wstime.tv_sec != 0) { /* writer wrote something */
268 if (s->server_stream_start.tv_sec == 0) {
269 /* copy status info to slot */
270 s->server_stream_start = stat_task->server_stream_start;
271 s->offset_seconds = stat_task->offset_seconds;
272 s->seconds_total = stat_task->length_seconds;
273 }
274 length = s->seconds_total;
275 tmp = &s->server_stream_start;
276 }
277 }
278 if (stat_task->sa_time_diff_sign > 0)
279 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
280 else
281 tv_add(tmp, &stat_task->sa_time_diff, &sss);
282 if (!s || !s->wns || !s->wns[0].btrn) {
283 struct timeval diff;
284 tv_diff(now, &sss, &diff);
285 seconds = diff.tv_sec + stat_task->offset_seconds;
286 goto out;
287 }
288 tv_diff(now, &wstime, &wtime);
289 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
290 seconds = s->offset_seconds;
291 if (s->receiver_node->btrn) {
292 btr_get_node_start(s->receiver_node->btrn, &rstime);
293 ret = tv_diff(&rstime, &sss, &rskip);
294 if (ret > 0) { /* audiod was started in the middle of the stream */
295 tv_add(&wtime, &rskip, &sum);
296 seconds += sum.tv_sec;
297 } else
298 seconds += wtime.tv_sec;
299 } else
300 seconds += wtime.tv_sec;
301 out:
302 seconds = PARA_MIN(seconds, length);
303 seconds = PARA_MAX(seconds, 0);
304 msg = make_message(
305 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
306 s? "" : "~",
307 seconds / 60,
308 seconds % 60,
309 (length - seconds) / 60,
310 (length - seconds) % 60,
311 length? (seconds * 100 + length / 2) / length : 0,
312 length / 60,
313 length % 60
314 );
315 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
316 return msg;
317 empty:
318 return para_strdup(NULL);
319 }
320
321 static void parse_config_or_die(void)
322 {
323 int ret;
324 char *config_file;
325 struct audiod_cmdline_parser_params params = {
326 .override = 0,
327 .initialize = 0,
328 .check_required = 1,
329 .check_ambiguity = 0,
330 .print_errors = 1
331 };
332
333 if (conf.config_file_given)
334 config_file = para_strdup(conf.config_file_arg);
335 else {
336 char *home = para_homedir();
337 config_file = make_message("%s/.paraslash/audiod.conf", home);
338 free(home);
339 }
340 ret = file_exists(config_file);
341 if (conf.config_file_given && !ret) {
342 PARA_EMERG_LOG("can not read config file %s\n", config_file);
343 goto err;
344 }
345 if (ret) {
346 audiod_cmdline_parser_config_file(config_file, &conf, &params);
347 daemon_set_loglevel(conf.loglevel_arg);
348 }
349 free(config_file);
350 return;
351 err:
352 free(config_file);
353 exit(EXIT_FAILURE);
354 }
355
356 static void setup_signal_handling(void)
357 {
358 signal_task = signal_init_or_die();
359 para_install_sighandler(SIGINT);
360 para_install_sighandler(SIGTERM);
361 para_install_sighandler(SIGHUP);
362 para_sigaction(SIGPIPE, SIG_IGN);
363 }
364
365 static void clear_slot(int slot_num)
366 {
367 struct slot_info *s = &slot[slot_num];
368
369 PARA_INFO_LOG("clearing slot %d\n", slot_num);
370 memset(s, 0, sizeof(struct slot_info));
371 s->format = -1;
372 }
373
374 static void close_receiver(int slot_num)
375 {
376 struct slot_info *s = &slot[slot_num];
377 struct audio_format_info *a;
378
379 if (s->format < 0 || !s->receiver_node)
380 return;
381 a = &afi[s->format];
382 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
383 audio_formats[s->format], slot_num);
384 a->receiver->close(s->receiver_node);
385 btr_remove_node(&s->receiver_node->btrn);
386 task_reap(&s->receiver_node->task);
387 free(s->receiver_node);
388 s->receiver_node = NULL;
389 stat_task->current_audio_format_num = -1;
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 task_reap(&wn->task);
405 }
406
407 static void close_writers(struct slot_info *s)
408 {
409 struct audio_format_info *a;
410 int i;
411
412 if (s->format < 0)
413 return;
414 assert(s->wns);
415 a = afi + s->format;
416 if (a->num_writers == 0)
417 writer_cleanup(s->wns);
418 else {
419 for (i = 0; i < a->num_writers; i++)
420 writer_cleanup(s->wns + i);
421 }
422 free(s->wns);
423 s->wns = NULL;
424 }
425
426 static void close_filters(struct slot_info *s)
427 {
428 int i;
429 struct audio_format_info *a = afi + s->format;
430 if (a->num_filters == 0)
431 return;
432 for (i = a->num_filters - 1; i >= 0; i--) {
433 struct filter_node *fn = s->fns + i;
434 struct filter *f;
435
436 if (!fn)
437 continue;
438 f = filters + fn->filter_num;
439 if (f->close)
440 f->close(fn);
441 btr_remove_node(&fn->btrn);
442 task_reap(&fn->task);
443 }
444 free(s->fns);
445 s->fns = NULL;
446 }
447
448 static void notify_receivers(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 task_notify(s->receiver_node->task, error);
459 }
460 }
461
462 static int get_empty_slot(void)
463 {
464 int i;
465 struct slot_info *s;
466
467 FOR_EACH_SLOT(i) {
468 s = &slot[i];
469 if (s->format < 0) {
470 clear_slot(i);
471 return i;
472 }
473 if (s->wns || s->receiver_node || s->fns)
474 continue;
475 clear_slot(i);
476 return i;
477 }
478 return -E_NO_MORE_SLOTS;
479 }
480
481 static void open_filters(struct slot_info *s)
482 {
483 struct audio_format_info *a = afi + s->format;
484 struct filter_node *fn;
485 int nf = a->num_filters;
486 struct btr_node *parent;
487 int i;
488
489 if (nf == 0)
490 return;
491 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
492 assert(s->fns == NULL);
493 s->fns = para_calloc(nf * sizeof(struct filter_node));
494 parent = s->receiver_node->btrn;
495 for (i = 0; i < nf; i++) {
496 char buf[20];
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->btrn = btr_new_node(&(struct btr_node_description)
502 EMBRACE(.name = f->name, .parent = parent,
503 .handler = f->execute, .context = fn));
504
505 f->open(fn);
506 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
507 fn->task = task_register(&(struct task_info) {
508 .name = buf,
509 .pre_select = f->pre_select,
510 .post_select = f->post_select,
511 .context = fn,
512 }, &sched);
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 }
517 }
518
519 static void open_writers(struct slot_info *s)
520 {
521 int i;
522 struct audio_format_info *a = afi + s->format;
523 struct writer_node *wn;
524 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
525
526 assert(s->wns == NULL);
527 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
528 * sizeof(struct writer_node));
529 for (i = 0; i < a->num_writers; i++) {
530 wn = s->wns + i;
531 wn->conf = a->writer_conf[i];
532 wn->writer_num = a->writer_nums[i];
533 register_writer_node(wn, parent, &sched);
534 PARA_NOTICE_LOG("%s writer started in slot %d\n",
535 writer_names[a->writer_nums[i]], (int)(s - slot));
536 }
537 }
538
539 /* returns slot num on success */
540 static int open_receiver(int format)
541 {
542 struct audio_format_info *a = &afi[format];
543 struct slot_info *s;
544 int ret, slot_num;
545 struct receiver *r = a->receiver;
546 struct receiver_node *rn;
547
548 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
549 ret = get_empty_slot();
550 if (ret < 0)
551 return ret;
552 slot_num = ret;
553 rn = para_calloc(sizeof(*rn));
554 rn->receiver = r;
555 rn->conf = a->receiver_conf;
556 rn->btrn = btr_new_node(&(struct btr_node_description)
557 EMBRACE(.name = r->name, .context = rn));
558 ret = r->open(rn);
559 if (ret < 0) {
560 btr_remove_node(&rn->btrn);
561 free(rn);
562 return ret;
563 }
564 s = &slot[slot_num];
565 s->format = format;
566 s->receiver_node = rn;
567 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
568 audio_formats[format], r->name, slot_num);
569 rn->task = task_register(&(struct task_info) {
570 .name = r->name,
571 .pre_select = r->pre_select,
572 .post_select = r->post_select,
573 .context = rn,
574 }, &sched);
575 return slot_num;
576 }
577
578 static bool receiver_running(void)
579 {
580 int i;
581 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
582
583 FOR_EACH_SLOT(i) {
584 struct slot_info *s = &slot[i];
585 long unsigned ss2 = s->server_stream_start.tv_sec;
586
587 if (!s->receiver_node)
588 continue;
589 if (task_status(s->receiver_node->task) >= 0)
590 return true;
591 if (ss1 == ss2)
592 return true;
593 }
594 return false;
595 }
596
597 /**
598 * Return the root node of the current buffer tree.
599 *
600 * This is only used for stream grabbing.
601 *
602 * \return \p NULL if no slot is currently active. If more than one buffer tree
603 * exists, the node corresponding to the most recently started receiver is
604 * returned.
605 */
606 struct btr_node *audiod_get_btr_root(void)
607 {
608 int i, newest_slot = -1;
609 struct timeval newest_rstime = {0, 0};
610
611 FOR_EACH_SLOT(i) {
612 struct slot_info *s = &slot[i];
613 struct timeval rstime;
614 if (!s->receiver_node)
615 continue;
616 if (task_status(s->receiver_node->task) < 0)
617 continue;
618 btr_get_node_start(s->receiver_node->btrn, &rstime);
619 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
620 continue;
621 newest_rstime = rstime;
622 newest_slot = i;
623 }
624 if (newest_slot == -1)
625 return NULL;
626 return slot[newest_slot].receiver_node->btrn;
627 }
628
629 /* whether a new instance of a decoder should be started. */
630 static bool must_start_decoder(void)
631 {
632 int cafn = stat_task->current_audio_format_num;
633 unsigned vs = stat_task->vss_status;
634
635 if (audiod_status != AUDIOD_ON)
636 return false;
637 if (cafn < 0)
638 return false;
639 if (!stat_task->ct)
640 return false;
641 if (vs & VSS_STATUS_FLAG_NEXT)
642 return false;
643 if (!(vs & VSS_STATUS_FLAG_PLAYING))
644 return false;
645 if (receiver_running())
646 return false;
647 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
648 return false;
649 return true;
650 }
651
652 static void compute_time_diff(const struct timeval *status_time)
653 {
654 struct timeval tmp, diff;
655 static unsigned count;
656 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
657 const struct timeval max_deviation = {0, 500 * 1000};
658 const int time_smooth = 5;
659
660 sign = tv_diff(status_time, now, &diff);
661 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
662 // sign, sa_time_diff_sign);
663 if (!count) {
664 sa_time_diff_sign = sign;
665 stat_task->sa_time_diff = diff;
666 count++;
667 goto out;
668 }
669 if (count > 5) {
670 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
671 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
672 PARA_WARNING_LOG("time diff jump: %lims\n",
673 s * tv2ms(&tmp));
674 }
675 count++;
676 sa_time_diff_sign = tv_convex_combination(
677 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
678 count > 10? sign : sign * time_smooth, &diff,
679 &tmp);
680 stat_task->sa_time_diff = tmp;
681 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
682 sign < 0? "-" : "+",
683 tv2ms(&diff),
684 sa_time_diff_sign < 0? "-" : "+",
685 tv2ms(&stat_task->sa_time_diff)
686 );
687 out:
688 stat_task->sa_time_diff_sign = sa_time_diff_sign;
689 }
690
691 static int update_item(int itemnum, char *buf)
692 {
693 long unsigned sec, usec;
694
695 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
696 return 1;
697 free(stat_item_values[itemnum]);
698 stat_item_values[itemnum] = para_strdup(buf);
699 stat_client_write_item(itemnum);
700 switch (itemnum) {
701 case SI_STATUS_FLAGS:
702 stat_task->vss_status = 0;
703 if (strchr(buf, 'N'))
704 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
705 if (strchr(buf, 'P'))
706 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
707 break;
708 case SI_OFFSET:
709 stat_task->offset_seconds = atoi(buf);
710 break;
711 case SI_SECONDS_TOTAL:
712 stat_task->length_seconds = atoi(buf);
713 break;
714 case SI_STREAM_START:
715 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
716 stat_task->server_stream_start.tv_sec = sec;
717 stat_task->server_stream_start.tv_usec = usec;
718 }
719 break;
720 case SI_CURRENT_TIME:
721 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
722 struct timeval tv = {sec, usec};
723 compute_time_diff(&tv);
724 }
725 break;
726 case SI_FORMAT:
727 stat_task->current_audio_format_num
728 = get_audio_format_num(buf);
729 }
730 return 1;
731 }
732
733 static int parse_stream_command(const char *txt, char **cmd)
734 {
735 int ret, len;
736 char *re, *p = strchr(txt, ':');
737
738 if (!p)
739 return -E_MISSING_COLON;
740 *cmd = p + 1;
741 len = p - txt;
742 re = malloc(len + 1);
743 strncpy(re, txt, len);
744 re[len] = '\0';
745 ret = get_matching_audio_format_nums(re);
746 free(re);
747 return ret;
748 }
749
750 static int add_filter(int format, char *cmdline)
751 {
752 struct audio_format_info *a = &afi[format];
753 int filter_num, nf = a->num_filters;
754 void *cfg;
755
756 filter_num = check_filter_arg(cmdline, &cfg);
757 if (filter_num < 0)
758 return filter_num;
759 a->filter_conf = para_realloc(a->filter_conf,
760 (nf + 1) * sizeof(void *));
761 a->filter_nums = para_realloc(a->filter_nums,
762 (nf + 1) * sizeof(unsigned));
763 a->filter_nums[nf] = filter_num;
764 a->filter_conf[nf] = cfg;
765 a->num_filters++;
766 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
767 filters[filter_num].name);
768 return filter_num;
769 }
770
771 static int parse_writer_args(void)
772 {
773 int i, ret;
774 char *cmd;
775 struct audio_format_info *a;
776
777 for (i = 0; i < conf.writer_given; i++) {
778 void *wconf;
779 int j, nw, writer_num, af_mask;
780
781 ret = parse_stream_command(conf.writer_arg[i], &cmd);
782 if (ret < 0)
783 return ret;
784 af_mask = ret;
785 FOR_EACH_AUDIO_FORMAT(j) {
786 a = afi + j;
787 if ((af_mask & (1 << j)) == 0) /* no match */
788 continue;
789 wconf = check_writer_arg_or_die(cmd, &writer_num);
790 nw = a->num_writers;
791 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
792 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
793 a->writer_nums[nw] = writer_num;
794 a->writer_conf[nw] = wconf;
795 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
796 nw, writer_names[writer_num]);
797 a->num_writers++;
798 }
799 }
800 /* Use default writer for audio formats which are not yet set up. */
801 FOR_EACH_AUDIO_FORMAT(i) {
802 void *writer_conf;
803 int writer_num;
804 a = afi + i;
805 if (a->num_writers > 0)
806 continue; /* already set up */
807 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
808 a->writer_nums = para_malloc(sizeof(int));
809 a->writer_nums[0] = writer_num;
810 a->writer_conf = para_malloc(sizeof(void *));
811 a->writer_conf[0] = writer_conf;
812 a->num_writers = 1;
813 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
814 writer_names[writer_num]);
815 }
816 return 1;
817 }
818
819 static int parse_receiver_args(void)
820 {
821 int i, ret, receiver_num;
822 char *cmd = NULL;
823 struct audio_format_info *a;
824
825 for (i = conf.receiver_given - 1; i >= 0; i--) {
826 char *arg;
827 int j, af_mask;
828
829 ret = parse_stream_command(conf.receiver_arg[i], &arg);
830 if (ret < 0)
831 goto out;
832 af_mask = ret;
833 FOR_EACH_AUDIO_FORMAT(j) {
834 a = afi + j;
835 if ((af_mask & (1 << j)) == 0) /* no match */
836 continue;
837 /*
838 * If multiple receivers are given for this audio format, the
839 * last one wins and we have to free the previous receiver
840 * config here. Since we are iterating backwards, the winning
841 * receiver arg is in fact the first one given.
842 */
843 if (a->receiver_conf)
844 a->receiver->free_config(a->receiver_conf);
845 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
846 ret = -E_RECV_SYNTAX;
847 if (!a->receiver_conf)
848 goto out;
849 a->receiver = receivers + receiver_num;
850 }
851 }
852 /*
853 * Use the first available receiver with no arguments for those audio
854 * formats for which no receiver was specified.
855 */
856 cmd = para_strdup(receivers[0].name);
857 FOR_EACH_AUDIO_FORMAT(i) {
858 a = &afi[i];
859 if (a->receiver_conf)
860 continue;
861 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
862 if (!a->receiver_conf)
863 return -E_RECV_SYNTAX;
864 a->receiver = &receivers[receiver_num];
865 }
866 FOR_EACH_AUDIO_FORMAT(i) {
867 a = afi + i;
868 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
869 audio_formats[i], a->receiver->name);
870 }
871 ret = 1;
872 out:
873 free(cmd);
874 return ret;
875 }
876
877 static int init_default_filters(void)
878 {
879 int i, ret = 1;
880
881 FOR_EACH_AUDIO_FORMAT(i) {
882 struct audio_format_info *a = &afi[i];
883 char *tmp;
884 int j;
885
886 if (a->num_filters)
887 continue; /* no default -- nothing to to */
888 /*
889 * udp and dccp streams are fec-encoded, so add fecdec as the
890 * first filter.
891 */
892 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
893 strcmp(afi[i].receiver->name, "dccp") == 0) {
894 tmp = para_strdup("fecdec");
895 add_filter(i, tmp);
896 free(tmp);
897 if (ret < 0)
898 goto out;
899 }
900 /* add "dec" to audio format name */
901 tmp = make_message("%sdec", audio_formats[i]);
902 for (j = 0; filters[j].name; j++)
903 if (!strcmp(tmp, filters[j].name))
904 break;
905 free(tmp);
906 ret = -E_UNSUPPORTED_FILTER;
907 if (!filters[j].name)
908 goto out;
909 tmp = para_strdup(filters[j].name);
910 ret = add_filter(i, tmp);
911 free(tmp);
912 if (ret < 0)
913 goto out;
914 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
915 filters[j].name);
916 }
917 out:
918 return ret;
919 }
920
921 static int parse_filter_args(void)
922 {
923 int i, j, ret, af_mask, num_matches;
924
925 for (i = 0; i < conf.filter_given; i++) {
926 char *arg;
927 ret = parse_stream_command(conf.filter_arg[i], &arg);
928 if (ret < 0)
929 goto out;
930 af_mask = ret;
931 num_matches = 0;
932 FOR_EACH_AUDIO_FORMAT(j) {
933 if ((af_mask & (1 << j)) == 0) /* no match */
934 continue;
935 ret = add_filter(j, arg);
936 if (ret < 0)
937 goto out;
938 num_matches++;
939 }
940 if (num_matches == 0)
941 PARA_WARNING_LOG("ignoring filter spec: %s\n",
942 conf.filter_arg[i]);
943 }
944 ret = init_default_filters(); /* use default values for the rest */
945 out:
946 return ret;
947 }
948
949 static int parse_stream_args(void)
950 {
951 int ret;
952
953 ret = parse_receiver_args();
954 if (ret < 0)
955 return ret;
956 ret = parse_filter_args();
957 if (ret < 0)
958 return ret;
959 ret = parse_writer_args();
960 if (ret < 0)
961 return ret;
962 return 1;
963 }
964
965 /* does not unlink socket on errors */
966 static void init_local_sockets(struct command_task *ct)
967 {
968 if (conf.socket_given)
969 socket_name = para_strdup(conf.socket_arg);
970 else {
971 char *hn = para_hostname();
972 socket_name = make_message("/var/paraslash/audiod_socket.%s",
973 hn);
974 free(hn);
975 }
976 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
977 if (conf.force_given)
978 unlink(socket_name);
979 ct->fd[0] = create_local_socket(socket_name, 0);
980 ct->fd[1] = create_local_socket(socket_name,
981 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
982 if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
983 return;
984 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
985 exit(EXIT_FAILURE);
986 }
987
988 static int signal_post_select(struct sched *s, void *context)
989 {
990 struct signal_task *st = context;
991 int ret, signum;
992
993 ret = task_get_notification(st->task);
994 if (ret < 0)
995 return ret;
996 signum = para_next_signal(&s->rfds);
997 switch (signum) {
998 case SIGINT:
999 case SIGTERM:
1000 case SIGHUP:
1001 PARA_NOTICE_LOG("received signal %d\n", signum);
1002 task_notify_all(s, E_AUDIOD_SIGNAL);
1003 return -E_AUDIOD_SIGNAL;
1004 }
1005 return 0;
1006 }
1007
1008 static void command_pre_select(struct sched *s, void *context)
1009 {
1010 struct command_task *ct = context;
1011 int i;
1012
1013 for (i = 0; i < 2; i++)
1014 if (ct->fd[i] >= 0)
1015 para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1016 }
1017
1018 static int command_post_select(struct sched *s, void *context)
1019 {
1020 int ret, i;
1021 struct command_task *ct = context;
1022 static struct timeval last_status_dump;
1023 struct timeval tmp, delay;
1024 bool force = false;
1025
1026 ret = task_get_notification(ct->task);
1027 if (ret < 0)
1028 return ret;
1029 for (i = 0; i < 2; i++) {
1030 if (ct->fd[i] < 0)
1031 continue;
1032 ret = handle_connect(ct->fd[i], &s->rfds);
1033 if (ret < 0) {
1034 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1035 if (ret == -E_AUDIOD_TERM) {
1036 task_notify_all(s, -ret);
1037 return ret;
1038 }
1039 } else if (ret > 0)
1040 force = true;
1041 }
1042 if (force == true)
1043 goto dump;
1044
1045 /* if last status dump was less than 500ms ago, do nothing */
1046 delay.tv_sec = 0;
1047 delay.tv_usec = 500 * 1000;
1048 tv_add(&last_status_dump, &delay, &tmp);
1049 if (tv_diff(now, &tmp, NULL) < 0)
1050 return 0;
1051
1052 /*
1053 * If last status dump was more than 5s ago, force update. Otherwise,
1054 * update only those items that have changed.
1055 */
1056 delay.tv_sec = 5;
1057 delay.tv_usec = 0;
1058 tv_add(&last_status_dump, &delay, &tmp);
1059 if (tv_diff(now, &tmp, NULL) > 0)
1060 force = true;
1061 dump:
1062 audiod_status_dump(force);
1063 last_status_dump = *now;
1064 return 1;
1065 }
1066
1067 static void init_command_task(struct command_task *ct)
1068 {
1069 init_local_sockets(ct); /* doesn't return on errors */
1070
1071 ct->task = task_register(&(struct task_info) {
1072 .name = "command",
1073 .pre_select = command_pre_select,
1074 .post_select = command_post_select,
1075 .context = ct,
1076 }, &sched);
1077 }
1078
1079 static void close_stat_pipe(void)
1080 {
1081 if (!stat_task->ct)
1082 return;
1083 task_reap(&stat_task->ct->task);
1084 client_close(stat_task->ct);
1085 stat_task->ct = NULL;
1086 clear_and_dump_items();
1087 stat_task->length_seconds = 0;
1088 stat_task->offset_seconds = 0;
1089 stat_task->vss_status = 0;
1090 stat_task->current_audio_format_num = -1;
1091 audiod_status_dump(true);
1092 }
1093
1094 /* avoid busy loop if server is down */
1095 static void set_stat_task_restart_barrier(unsigned seconds)
1096 {
1097 struct timeval delay = {seconds, 0};
1098 tv_add(now, &delay, &stat_task->restart_barrier);
1099 }
1100
1101 static bool must_close_slot(int slot_num)
1102 {
1103 struct slot_info *s = &slot[slot_num];
1104 struct audio_format_info *a = afi + s->format;
1105 int i;
1106
1107 if (s->format < 0)
1108 return false;
1109 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1110 return false;
1111 for (i = 0; i < a->num_filters; i++)
1112 if (s->fns && task_status(s->fns[i].task) >= 0)
1113 return false;
1114 if (a->num_writers > 0) {
1115 for (i = 0; i < a->num_writers; i++)
1116 if (s->wns && task_status(s->wns[i].task) >= 0)
1117 return false;
1118 } else {
1119 if (s->wns && task_status(s->wns[0].task) >= 0)
1120 return false;
1121 }
1122 return true;
1123 }
1124
1125 static void close_slot(int slot_num)
1126 {
1127 struct slot_info *s = slot + slot_num;
1128
1129 PARA_INFO_LOG("closing slot %d\n", slot_num);
1130 close_writers(s);
1131 close_filters(s);
1132 close_receiver(slot_num);
1133 clear_slot(slot_num);
1134 }
1135
1136 static void close_unused_slots(void)
1137 {
1138 int i;
1139
1140 FOR_EACH_SLOT(i)
1141 if (must_close_slot(i))
1142 close_slot(i);
1143 }
1144
1145 /*
1146 * Cleanup all resources.
1147 *
1148 * This performs various cleanups, removes the audiod socket and closes the
1149 * connection to para_server.
1150 */
1151 static void audiod_cleanup(void)
1152 {
1153 if (socket_name)
1154 unlink(socket_name);
1155 close_stat_pipe();
1156 close_unused_slots();
1157 audiod_cmdline_parser_free(&conf);
1158 close_stat_clients();
1159 }
1160
1161 /*
1162 * Check if any receivers/filters/writers need to be started and do so if
1163 * necessary.
1164 */
1165 static void start_stop_decoders(void)
1166 {
1167 int ret;
1168 struct slot_info *sl;
1169
1170 close_unused_slots();
1171 if (audiod_status != AUDIOD_ON ||
1172 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1173 return notify_receivers(E_NOT_PLAYING);
1174 if (!must_start_decoder())
1175 return;
1176 ret = open_receiver(stat_task->current_audio_format_num);
1177 if (ret < 0) {
1178 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1179 return;
1180 }
1181 sl = slot + ret;
1182 open_filters(sl);
1183 open_writers(sl);
1184 activate_grab_clients(&sched);
1185 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1186 }
1187
1188 static void status_pre_select(struct sched *s, void *context)
1189 {
1190 struct status_task *st = context;
1191 int i, ret, cafn = stat_task->current_audio_format_num;
1192
1193 if (must_start_decoder())
1194 goto min_delay;
1195 FOR_EACH_SLOT(i)
1196 if (must_close_slot(i))
1197 goto min_delay;
1198 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1199 if (ret > 0)
1200 goto min_delay;
1201 if (st->ct && audiod_status == AUDIOD_OFF)
1202 goto min_delay;
1203 if (!st->ct && audiod_status != AUDIOD_OFF)
1204 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1205 if (cafn >= 0)
1206 sched_request_barrier(&afi[cafn].restart_barrier, s);
1207 /*
1208 * If para_server is playing we'd like to have a smooth time display
1209 * even if we are running in standby mode. So we request a timeout that
1210 * expires at the next full second.
1211 */
1212 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1213 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1214 return;
1215 min_delay:
1216 sched_min_delay(s);
1217 }
1218
1219 /* restart the client task if necessary */
1220 static int status_post_select(struct sched *s, void *context)
1221 {
1222 struct status_task *st = context;
1223 int ret;
1224
1225 ret = task_get_notification(st->task);
1226 if (ret < 0)
1227 return ret;
1228 if (audiod_status == AUDIOD_OFF) {
1229 if (!st->ct)
1230 goto out;
1231 if (task_status(st->ct->task) >= 0) {
1232 task_notify(st->ct->task, E_AUDIOD_OFF);
1233 goto out;
1234 }
1235 close_stat_pipe();
1236 st->clock_diff_count = conf.clock_diff_count_arg;
1237 goto out;
1238 }
1239 if (st->ct) {
1240 char *buf;
1241 size_t sz;
1242
1243 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1244 if (ret < 0) {
1245 close_stat_pipe();
1246 goto out;
1247 }
1248 if (st->ct->status != CL_EXECUTING)
1249 goto out;
1250 if (ret == 0) {
1251 struct timeval diff;
1252 tv_diff(now, &st->last_status_read, &diff);
1253 if (diff.tv_sec > 61)
1254 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1255 goto out;
1256 }
1257 btr_merge(st->btrn, st->min_iqs);
1258 sz = btr_next_buffer(st->btrn, &buf);
1259 ret = for_each_stat_item(buf, sz, update_item);
1260 if (ret < 0) {
1261 task_notify(st->ct->task, -ret);
1262 goto out;
1263 }
1264 if (sz != ret) {
1265 btr_consume(st->btrn, sz - ret);
1266 st->last_status_read = *now;
1267 st->min_iqs = 0;
1268 } else /* current status item crosses buffers */
1269 st->min_iqs = sz + 1;
1270 goto out;
1271 }
1272 btr_drain(st->btrn);
1273 st->current_audio_format_num = -1;
1274 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1275 goto out;
1276 if (st->clock_diff_count) { /* get status only one time */
1277 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1278 int argc = 5;
1279 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1280 st->clock_diff_count--;
1281 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1282 set_stat_task_restart_barrier(2);
1283
1284 } else {
1285 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1286 int argc = 4;
1287 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1288 set_stat_task_restart_barrier(5);
1289 }
1290 free(stat_item_values[SI_BASENAME]);
1291 stat_item_values[SI_BASENAME] = para_strdup(
1292 "no connection to para_server");
1293 stat_client_write_item(SI_BASENAME);
1294 st->last_status_read = *now;
1295 out:
1296 start_stop_decoders();
1297 return 0;
1298 }
1299
1300 static void init_status_task(struct status_task *st)
1301 {
1302 memset(st, 0, sizeof(struct status_task));
1303 st->sa_time_diff_sign = 1;
1304 st->clock_diff_count = conf.clock_diff_count_arg;
1305 st->current_audio_format_num = -1;
1306 st->btrn = btr_new_node(&(struct btr_node_description)
1307 EMBRACE(.name = "stat"));
1308
1309 stat_task->task = task_register(&(struct task_info) {
1310 .name = "stat",
1311 .pre_select = status_pre_select,
1312 .post_select = status_post_select,
1313 .context = stat_task,
1314 }, &sched);
1315 }
1316
1317 static void set_initial_status(void)
1318 {
1319 audiod_status = AUDIOD_ON;
1320 if (!conf.mode_given)
1321 return;
1322 if (!strcmp(conf.mode_arg, "sb")) {
1323 audiod_status = AUDIOD_STANDBY;
1324 return;
1325 }
1326 if (!strcmp(conf.mode_arg, "off")) {
1327 audiod_status = AUDIOD_OFF;
1328 return;
1329 }
1330 if (strcmp(conf.mode_arg, "on"))
1331 PARA_WARNING_LOG("invalid mode\n");
1332 }
1333
1334 __noreturn static void print_help_and_die(void)
1335 {
1336 struct ggo_help h = DEFINE_GGO_HELP(audiod);
1337 bool d = conf.detailed_help_given;
1338 unsigned flags;
1339
1340 flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1341 ggo_print_help(&h, flags);
1342
1343 flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1344 print_receiver_helps(flags);
1345 print_filter_helps(flags);
1346 print_writer_helps(flags);
1347 exit(0);
1348 }
1349
1350 /**
1351 * the main function of para_audiod
1352 *
1353 * \param argc usual argument count
1354 * \param argv usual argument vector
1355 *
1356 * \return EXIT_SUCCESS or EXIT_FAILURE
1357 *
1358 * \sa para_audiod(1)
1359 * */
1360 int main(int argc, char *argv[])
1361 {
1362 int ret, i;
1363 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1364 struct audiod_cmdline_parser_params params = {
1365 .override = 0,
1366 .initialize = 1,
1367 .check_required = 0,
1368 .check_ambiguity = 0,
1369 .print_errors = 1
1370 };
1371
1372 valid_fd_012();
1373 audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1374 daemon_set_loglevel(conf.loglevel_arg);
1375 version_handle_flag("audiod", conf.version_given);
1376 /* init receivers/filters/writers early to make help work */
1377 recv_init();
1378 filter_init();
1379 writer_init();
1380 if (conf.help_given || conf.detailed_help_given)
1381 print_help_and_die();
1382 daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1383 parse_config_or_die();
1384 daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1385 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1386 init_random_seed_or_die();
1387 daemon_set_flag(DF_LOG_TIME);
1388 daemon_set_flag(DF_LOG_HOSTNAME);
1389 daemon_set_flag(DF_LOG_LL);
1390 if (conf.log_timing_given)
1391 daemon_set_flag(DF_LOG_TIMING);
1392 if (conf.logfile_given) {
1393 daemon_set_logfile(conf.logfile_arg);
1394 daemon_open_log_or_die();
1395 }
1396 ret = parse_stream_args();
1397 if (ret < 0) {
1398 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1399 exit(EXIT_FAILURE);
1400 }
1401 daemon_log_welcome("para_audiod");
1402 daemon_set_start_time();
1403 set_initial_status();
1404 FOR_EACH_SLOT(i)
1405 clear_slot(i);
1406 setup_signal_handling();
1407
1408 init_status_task(stat_task);
1409 init_command_task(cmd_task);
1410
1411 if (conf.daemon_given)
1412 daemonize(false /* parent exits immediately */);
1413
1414 signal_task->task = task_register(&(struct task_info) {
1415 .name = "signal",
1416 .pre_select = signal_pre_select,
1417 .post_select = signal_post_select,
1418 .context = signal_task,
1419 }, &sched);
1420
1421 sched.default_timeout.tv_sec = 2;
1422 sched.default_timeout.tv_usec = 999 * 1000;
1423 ret = schedule(&sched);
1424 audiod_cleanup();
1425 sched_shutdown(&sched);
1426 signal_shutdown(signal_task);
1427
1428 if (ret < 0)
1429 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1430 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1431 }