Rework para_accept().
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2010 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c the paraslash's audio daemon */
8 #include <regex.h>
9 #include <sys/types.h>
10 #include <dirent.h>
11 #include <signal.h>
12 #include <openssl/rc4.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "error.h"
17 #include "crypt.h"
18 #include "audiod.cmdline.h"
19 #include "list.h"
20 #include "sched.h"
21 #include "ggo.h"
22 #include "recv.h"
23 #include "buffer_tree.h"
24 #include "filter.h"
25 #include "grab_client.h"
26 #include "client.cmdline.h"
27 #include "client.h"
28 #include "audiod.h"
29 #include "net.h"
30 #include "daemon.h"
31 #include "string.h"
32 #include "fd.h"
33 #include "write.h"
34 #include "write_common.h"
35 #include "signal.h"
36
37 /** define the array of error lists needed by para_audiod */
38 INIT_AUDIOD_ERRLISTS;
39 /** define the array containing all supported audio formats */
40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
41
42 /** Defines how audiod handles one supported audio format. */
43 struct audio_format_info {
44 /** pointer to the receiver for this audio format */
45 struct receiver *receiver;
46 /** the receiver configuration */
47 void *receiver_conf;
48 /** the number of filters that should be activated for this audio format */
49 unsigned int num_filters;
50 /** Array of filter numbers to be activated. */
51 unsigned *filter_nums;
52 /** Pointer to the array of filter configurations. */
53 void **filter_conf;
54 /** the number of filters that should be activated for this audio format */
55 unsigned int num_writers;
56 /** Array of writer numbers to be activated. */
57 int *writer_nums;
58 /** pointer to the array of writer configurations */
59 void **writer_conf;
60 /** do not start receiver/filters/writer before this time */
61 struct timeval restart_barrier;
62 };
63
64 /**
65 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
66 * be associated with a receiver/filter/writer triple. This array holds all
67 * information on the status of these slots.
68 *
69 * \sa struct slot_info
70 * */
71 struct slot_info slot[MAX_STREAM_SLOTS];
72
73 /** The vss status flags audiod is interested in. */
74 enum vss_status_flags {
75 /** Whether the 'N' flag is set. */
76 VSS_STATUS_FLAG_NEXT = 1,
77 /** The 'P' flag is set. */
78 VSS_STATUS_FLAG_PLAYING = 2,
79 };
80
81 /**
82 * The task for obtaining para_server's status (para_client stat).
83 *
84 * \sa struct task, struct sched.
85 */
86 struct status_task {
87 /** The associated task structure of audiod. */
88 struct task task;
89 /** Client data associated with the stat task. */
90 struct client_task *ct;
91 /** Do not restart client command until this time. */
92 struct timeval restart_barrier;
93 /** Last time we received status data from para_server. */
94 struct timeval last_status_read;
95 size_t min_iqs;
96 /** The offset value announced by para_server. */
97 int offset_seconds;
98 /** The length of the current audio file as announced by para_server. */
99 int length_seconds;
100 /** The start of the current stream from the view of para_server. */
101 struct timeval server_stream_start;
102 /** The average time deviation between para_server and para_audiod. */
103 struct timeval sa_time_diff;
104 /** Whether client time is ahead of server time. */
105 int sa_time_diff_sign;
106 /** The 'P' and the 'N' flags as announced by para_server. */
107 enum vss_status_flags vss_status;
108 /** Number of times the clock difference is to be checked. */
109 unsigned clock_diff_count;
110 /** When to start the next check for clock difference. */
111 struct timeval clock_diff_barrier;
112 /** Number of the audio format as announced by para_server. */
113 int current_audio_format_num;
114 /* The status task btrn is the child of the client task. */
115 struct btr_node *btrn;
116 };
117
118 /** The array of status items sent by para_server. */
119 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
120
121 /**
122 * the current mode of operation of which can be changed by the on/off/cycle
123 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
124 */
125 int audiod_status = AUDIOD_ON;
126
127 /**
128 * the gengetopt args_info struct that holds information on all command line
129 * arguments
130 */
131 struct audiod_args_info conf;
132
133 static char *socket_name;
134 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
135
136 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
137
138 static struct status_task status_task_struct;
139
140 /**
141 * the task that calls the status command of para_server
142 *
143 * \sa struct status_task
144 */
145 static struct status_task *stat_task = &status_task_struct;
146
147 /**
148 * the task for handling audiod commands
149 *
150 * \sa struct task, struct sched
151 */
152 struct command_task {
153 /** the local listening socket */
154 int fd;
155 /** the associated task structure */
156 struct task task;
157 };
158
159 /** iterate over all supported audio formats */
160 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
161
162 /**
163 * Get the audio format number.
164 *
165 * \param name The name of the audio format.
166 *
167 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
168 * \a name is not a supported audio format.
169 */
170 int get_audio_format_num(const char *name)
171 {
172 int i;
173
174 while (para_isspace(*name))
175 name++;
176 FOR_EACH_AUDIO_FORMAT(i)
177 if (!strcmp(name, audio_formats[i]))
178 return i;
179 return -E_UNSUPPORTED_AUDIO_FORMAT;
180 }
181
182 /**
183 * Compute the play time based on information of the given slot.
184 *
185 * \param slot_num The slot number (negative means: no slot).
186 *
187 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
188 * from the status items received from para_server and the start time of the
189 * (first) writer of the given slot.
190 *
191 * It has to to take into account that probably the stream was not started at
192 * the beginning of the file, that the clock between the server and the client
193 * host may differ and that playback of the stream was delayed, e.g. because
194 * the prebuffer filter is used in the filter chain of the given slot.
195 *
196 * If no writer is active in the given slot, or \a slot_num is negative
197 * (indicating that para_audiod runs in standby mode), an approximation based
198 * only on the status items is computed and the returned string is prefixed
199 * with "~".
200 *
201 * \return A string that must be freed by the caller.
202 */
203 char *get_time_string(int slot_num)
204 {
205 int ret, seconds = 0, length;
206 struct timeval *tmp, sum, sss, /* server stream start */
207 rstime, /* receiver start time */
208 wstime, /* writer start time */
209 wtime, /* now - writer start */
210 rskip; /* receiver start - sss */
211 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
212 char *msg;
213
214 if (audiod_status == AUDIOD_OFF)
215 goto empty;
216 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
217 if (stat_task->length_seconds) /* paused */
218 return NULL;
219 goto empty; /* stopped */
220 }
221 if (audiod_status == AUDIOD_ON && !s)
222 goto empty;
223 /*
224 * Valid status items and playing, set length and tmp to the stream
225 * start. We use the slot info and fall back to the info from current
226 * status items if no slot info is available.
227 */
228 length = stat_task->length_seconds;
229 tmp = &stat_task->server_stream_start;
230 if (s && s->wns) { /* writer active in this slot */
231 btr_get_node_start(s->wns[0].btrn, &wstime);
232 if (wstime.tv_sec != 0) { /* writer wrote something */
233 if (s->server_stream_start.tv_sec == 0) {
234 /* copy status info to slot */
235 s->server_stream_start = stat_task->server_stream_start;
236 s->offset_seconds = stat_task->offset_seconds;
237 s->seconds_total = stat_task->length_seconds;
238 }
239 length = s->seconds_total;
240 tmp = &s->server_stream_start;
241 }
242 }
243 if (stat_task->sa_time_diff_sign > 0)
244 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
245 else
246 tv_add(tmp, &stat_task->sa_time_diff, &sss);
247 if (!s || !s->wns) {
248 struct timeval diff;
249 tv_diff(now, &sss, &diff);
250 seconds = diff.tv_sec + stat_task->offset_seconds;
251 goto out;
252 }
253 tv_diff(now, &wstime, &wtime);
254 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
255 seconds = s->offset_seconds;
256 btr_get_node_start(s->receiver_node->btrn, &rstime);
257 ret = tv_diff(&rstime, &sss, &rskip);
258 if (ret > 0) { /* audiod was started in the middle of the stream */
259 tv_add(&wtime, &rskip, &sum);
260 seconds += sum.tv_sec;
261 } else
262 seconds += wtime.tv_sec;
263 out:
264 seconds = PARA_MIN(seconds, length);
265 seconds = PARA_MAX(seconds, 0);
266 msg = make_message(
267 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
268 s? "" : "~",
269 seconds / 60,
270 seconds % 60,
271 (length - seconds) / 60,
272 (length - seconds) % 60,
273 length? (seconds * 100 + length / 2) / length : 0,
274 length / 60,
275 length % 60
276 );
277 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
278 return msg;
279 empty:
280 return para_strdup(NULL);
281 }
282
283 static int want_colors(void)
284 {
285 if (conf.color_arg == color_arg_no)
286 return 0;
287 if (conf.color_arg == color_arg_yes)
288 return 1;
289 if (conf.logfile_given)
290 return 0;
291 return isatty(STDERR_FILENO);
292 }
293
294 static void parse_config_or_die(void)
295 {
296 int ret;
297 char *config_file;
298 struct audiod_cmdline_parser_params params = {
299 .override = 0,
300 .initialize = 0,
301 .check_required = 1,
302 .check_ambiguity = 0,
303 .print_errors = 1
304 };
305
306 if (conf.config_file_given)
307 config_file = para_strdup(conf.config_file_arg);
308 else {
309 char *home = para_homedir();
310 config_file = make_message("%s/.paraslash/audiod.conf", home);
311 free(home);
312 }
313 ret = file_exists(config_file);
314 if (conf.config_file_given && !ret) {
315 PARA_EMERG_LOG("can not read config file %s\n", config_file);
316 goto err;
317 }
318 if (ret)
319 audiod_cmdline_parser_config_file(config_file, &conf, &params);
320 free(config_file);
321 daemon_set_loglevel(conf.loglevel_arg);
322 return;
323 err:
324 free(config_file);
325 exit(EXIT_FAILURE);
326 }
327
328 static void setup_signal_handling(void)
329 {
330 sig_task->fd = para_signal_init();
331 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
332 para_install_sighandler(SIGINT);
333 para_install_sighandler(SIGTERM);
334 para_install_sighandler(SIGHUP);
335 para_sigaction(SIGPIPE, SIG_IGN);
336 }
337
338 static void clear_slot(int slot_num)
339 {
340 struct slot_info *s = &slot[slot_num];
341
342 PARA_INFO_LOG("clearing slot %d\n", slot_num);
343 memset(s, 0, sizeof(struct slot_info));
344 s->format = -1;
345 }
346
347 static void close_receiver(int slot_num)
348 {
349 struct slot_info *s = &slot[slot_num];
350 struct audio_format_info *a;
351
352 if (s->format < 0 || !s->receiver_node)
353 return;
354 a = &afi[s->format];
355 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
356 audio_formats[s->format], slot_num);
357 a->receiver->close(s->receiver_node);
358 btr_free_node(s->receiver_node->btrn);
359 free(s->receiver_node);
360 s->receiver_node = NULL;
361 }
362
363 static void writer_cleanup(struct writer_node *wn)
364 {
365 struct writer *w;
366
367 if (!wn)
368 return;
369 w = writers + wn->writer_num;
370 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
371 w->close(wn);
372 btr_free_node(wn->btrn);
373 }
374
375 static void close_writers(struct slot_info *s)
376 {
377 struct audio_format_info *a;
378 int i;
379
380 if (s->format < 0)
381 return;
382 assert(s->wns);
383 a = afi + s->format;
384 if (a->num_writers == 0)
385 writer_cleanup(s->wns);
386 else {
387 for (i = 0; i < a->num_writers; i++)
388 writer_cleanup(s->wns + i);
389 }
390 free(s->wns);
391 s->wns = NULL;
392 }
393
394 static void close_filters(struct slot_info *s)
395 {
396 int i;
397 struct audio_format_info *a = afi + s->format;
398 if (a->num_filters == 0)
399 return;
400 for (i = 0; i < a->num_filters; i++) {
401 struct filter_node *fn = s->fns + i;
402 struct filter *f;
403
404 if (!fn)
405 continue;
406 f = filters + fn->filter_num;
407 if (f->close)
408 f->close(fn);
409 btr_free_node(fn->btrn);
410 }
411 free(s->fns);
412 s->fns = NULL;
413 }
414
415 /*
416 * Whenever a task commits suicide by returning from post_select with t->error
417 * < 0, it also removes its btr node. We do exactly that to kill a running
418 * task. Note that the scheduler checks t->error also _before_ each pre/post
419 * select call, so the victim will never be scheduled again.
420 */
421 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
422 {
423 if (t->error < 0)
424 return;
425 t->error = error;
426 btr_remove_node(btrn);
427 }
428
429 static void kill_all_decoders(int error)
430 {
431 int i, j;
432
433 FOR_EACH_SLOT(i) {
434 struct slot_info *s = &slot[i];
435 struct audio_format_info *a;
436 if (s->format < 0)
437 continue;
438 a = afi + s->format;
439 if (s->wns)
440 for (j = 0; j < a->num_writers; j++)
441 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
442 if (s->fns)
443 for (j = 0; j < a->num_writers; j++)
444 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
445 if (s->receiver_node)
446 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
447 error);
448 }
449 }
450
451 static int get_empty_slot(void)
452 {
453 int i;
454 struct slot_info *s;
455
456 FOR_EACH_SLOT(i) {
457 s = &slot[i];
458 if (s->format < 0) {
459 clear_slot(i);
460 return i;
461 }
462 if (s->wns || s->receiver_node || s->fns)
463 continue;
464 clear_slot(i);
465 return i;
466 }
467 return -E_NO_MORE_SLOTS;
468 }
469
470 /**
471 * get the number of filters
472 *
473 * \param audio_format_num the number identifying the audio format
474 *
475 * \return the number of filters for the given audio format
476 *
477 * \sa struct filter;
478 */
479 int num_filters(int audio_format_num)
480 {
481 return afi[audio_format_num].num_filters;
482 }
483
484 static void open_filters(struct slot_info *s)
485 {
486 struct audio_format_info *a = afi + s->format;
487 struct filter_node *fn;
488 int nf = a->num_filters;
489 struct btr_node *parent;
490 int i;
491
492 if (nf == 0)
493 return;
494 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
495 assert(s->fns == NULL);
496 s->fns = para_calloc(nf * sizeof(struct filter_node));
497 parent = s->receiver_node->btrn;
498 for (i = 0; i < nf; i++) {
499 struct filter *f = filters + a->filter_nums[i];
500 fn = s->fns + i;
501 fn->filter_num = a->filter_nums[i];
502 fn->conf = a->filter_conf[i];
503 fn->task.pre_select = f->pre_select;
504 fn->task.post_select = f->post_select;
505
506 fn->btrn = btr_new_node(&(struct btr_node_description)
507 EMBRACE(.name = f->name, .parent = parent,
508 .handler = f->execute, .context = fn));
509
510 f->open(fn);
511 register_task(&fn->task);
512 parent = fn->btrn;
513 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
514 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
515 sprintf(fn->task.status, "%s (slot %d)", 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 if (a->num_writers == 0)
530 setup_writer_node(NULL, parent, s->wns);
531 else {
532 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
533 for (i = 0; i < a->num_writers; i++) {
534 wn = s->wns + i;
535 wn->conf = a->writer_conf[i];
536 wn->writer_num = a->writer_nums[i];
537 register_writer_node(wn, parent);
538 }
539 }
540 }
541
542 /* returns slot num on success */
543 static int open_receiver(int format)
544 {
545 struct audio_format_info *a = &afi[format];
546 struct slot_info *s;
547 int ret, slot_num;
548 struct receiver *r = a->receiver;
549 struct receiver_node *rn;
550
551 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
552 ret = get_empty_slot();
553 if (ret < 0)
554 return ret;
555 slot_num = ret;
556 rn = para_calloc(sizeof(*rn));
557 rn->receiver = r;
558 rn->conf = a->receiver_conf;
559 rn->btrn = btr_new_node(&(struct btr_node_description)
560 EMBRACE(.name = r->name, .context = rn));
561 ret = r->open(rn);
562 if (ret < 0) {
563 btr_free_node(rn->btrn);
564 free(rn);
565 return ret;
566 }
567 s = &slot[slot_num];
568 s->format = format;
569 s->receiver_node = rn;
570 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
571 audio_formats[format], r->name, slot_num);
572 rn->task.pre_select = r->pre_select;
573 rn->task.post_select = r->post_select;
574 sprintf(rn->task.status, "%s receiver node", r->name);
575 register_task(&rn->task);
576 return slot_num;
577 }
578
579 static bool receiver_running(void)
580 {
581 int i;
582 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
583
584 FOR_EACH_SLOT(i) {
585 struct slot_info *s = &slot[i];
586 long unsigned ss2 = s->server_stream_start.tv_sec;
587
588 if (!s->receiver_node)
589 continue;
590 if (s->receiver_node->task.error >= 0)
591 return true;
592 if (ss1 == ss2)
593 return true;
594 }
595 return false;
596 }
597
598 /**
599 * Return the root node of the current buffer tree.
600 *
601 * This is only used for stream grabbing.
602 *
603 * \return \p NULL if no slot is currently active. If more than one buffer tree
604 * exists, the node corresponding to the most recently started receiver is
605 * returned.
606 */
607 struct btr_node *audiod_get_btr_root(void)
608 {
609 int i, newest_slot = -1;
610 struct timeval newest_rstime = {0, 0};
611
612 FOR_EACH_SLOT(i) {
613 struct slot_info *s = &slot[i];
614 struct timeval rstime;
615 if (!s->receiver_node)
616 continue;
617 if (s->receiver_node->task.error < 0)
618 continue;
619 btr_get_node_start(s->receiver_node->btrn, &rstime);
620 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
621 continue;
622 newest_rstime = rstime;
623 newest_slot = i;
624 }
625 if (newest_slot == -1)
626 return NULL;
627 return slot[newest_slot].receiver_node->btrn;
628 }
629
630 /* whether a new instance of a decoder should be started. */
631 static bool must_start_decoder(void)
632 {
633 int cafn = stat_task->current_audio_format_num;
634 unsigned vs = stat_task->vss_status;
635
636 if (audiod_status != AUDIOD_ON)
637 return false;
638 if (cafn < 0)
639 return false;
640 if (!stat_task->ct)
641 return false;
642 if (vs & VSS_STATUS_FLAG_NEXT)
643 return false;
644 if (!(vs & VSS_STATUS_FLAG_PLAYING))
645 return false;
646 if (receiver_running())
647 return false;
648 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
649 return false;
650 return true;
651 }
652
653 static unsigned compute_time_diff(const struct timeval *status_time)
654 {
655 struct timeval tmp, diff;
656 static unsigned count;
657 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
658 const struct timeval max_deviation = {0, 500 * 1000};
659 const int time_smooth = 5;
660
661 if (!status_time)
662 return count;
663 sign = tv_diff(status_time, now, &diff);
664 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
665 // sign, sa_time_diff_sign);
666 if (!count) {
667 sa_time_diff_sign = sign;
668 stat_task->sa_time_diff = diff;
669 count++;
670 goto out;
671 }
672 if (count > 5) {
673 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
674 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
675 PARA_WARNING_LOG("time diff jump: %lims\n",
676 s * tv2ms(&tmp));
677 }
678 count++;
679 sa_time_diff_sign = tv_convex_combination(
680 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
681 count > 10? sign : sign * time_smooth, &diff,
682 &tmp);
683 stat_task->sa_time_diff = tmp;
684 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
685 sign < 0? "-" : "+",
686 tv2ms(&diff),
687 sa_time_diff_sign < 0? "-" : "+",
688 tv2ms(&stat_task->sa_time_diff)
689 );
690 out:
691 stat_task->sa_time_diff_sign = sa_time_diff_sign;
692 return count;
693 }
694
695 static int update_item(int itemnum, char *buf)
696 {
697 long unsigned sec, usec;
698
699 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
700 return 1;
701 free(stat_item_values[itemnum]);
702 stat_item_values[itemnum] = para_strdup(buf);
703 stat_client_write_item(itemnum);
704 switch (itemnum) {
705 case SI_STATUS_FLAGS:
706 stat_task->vss_status = 0;
707 if (strchr(buf, 'N'))
708 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
709 if (strchr(buf, 'P'))
710 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
711 break;
712 case SI_OFFSET:
713 stat_task->offset_seconds = atoi(buf);
714 break;
715 case SI_SECONDS_TOTAL:
716 stat_task->length_seconds = atoi(buf);
717 break;
718 case SI_STREAM_START:
719 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
720 stat_task->server_stream_start.tv_sec = sec;
721 stat_task->server_stream_start.tv_usec = usec;
722 }
723 break;
724 case SI_CURRENT_TIME:
725 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
726 struct timeval tv = {sec, usec};
727 compute_time_diff(&tv);
728 }
729 break;
730 case SI_FORMAT:
731 stat_task->current_audio_format_num
732 = get_audio_format_num(buf);
733 }
734 return 1;
735 }
736
737 static int parse_stream_command(const char *txt, char **cmd)
738 {
739 char *p = strchr(txt, ':');
740 int i;
741
742 if (!p)
743 return -E_MISSING_COLON;
744 p++;
745 FOR_EACH_AUDIO_FORMAT(i) {
746 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
747 continue;
748 *cmd = p;
749 return i;
750 }
751 return -E_UNSUPPORTED_AUDIO_FORMAT;
752 }
753
754 static int add_filter(int format, char *cmdline)
755 {
756 struct audio_format_info *a = &afi[format];
757 int filter_num, nf = a->num_filters;
758
759 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
760 if (filter_num < 0)
761 return filter_num;
762 a->filter_nums[nf] = filter_num;
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, nw;
772 char *cmd;
773 struct audio_format_info *a;
774
775 nw = PARA_MAX(1U, conf.writer_given);
776 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
777 FOR_EACH_AUDIO_FORMAT(i) {
778 a = &afi[i];
779 a->writer_conf = para_malloc(nw * sizeof(void *));
780 a->writer_nums = para_malloc(nw * sizeof(int));
781 a->num_writers = 0;
782 }
783 for (i = 0; i < conf.writer_given; i++) {
784 void *wconf;
785 int writer_num;
786 ret = parse_stream_command(conf.writer_arg[i], &cmd);
787 if (ret < 0)
788 goto out;
789 a = &afi[ret];
790 nw = a->num_writers;
791 wconf = check_writer_arg(cmd, &writer_num);
792 if (!wconf) {
793 ret = writer_num;
794 goto out;
795 }
796 a->writer_nums[nw] = writer_num;
797 a->writer_conf[nw] = wconf;
798 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
799 nw, writer_names[writer_num]);
800 a->num_writers++;
801 }
802 ret = 1;
803 out:
804 return ret;
805 }
806
807 static int parse_receiver_args(void)
808 {
809 int i, ret, receiver_num;
810 char *cmd = NULL;
811 struct audio_format_info *a;
812
813 for (i = conf.receiver_given - 1; i >= 0; i--) {
814 char *arg = conf.receiver_arg[i];
815 char *recv_arg = strchr(arg, ':');
816 ret = -E_MISSING_COLON;
817 if (!recv_arg)
818 goto out;
819 *recv_arg = '\0';
820 recv_arg++;
821 ret = get_audio_format_num(arg);
822 if (ret < 0)
823 goto out;
824 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
825 if (!afi[ret].receiver_conf) {
826 ret = -E_RECV_SYNTAX;
827 goto out;
828 }
829 afi[ret].receiver = &receivers[receiver_num];
830 }
831 /* use the first available receiver with no arguments
832 * for those audio formats for which no receiver
833 * was specified
834 */
835 cmd = para_strdup(receivers[0].name);
836 FOR_EACH_AUDIO_FORMAT(i) {
837 a = &afi[i];
838 if (a->receiver_conf)
839 continue;
840 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
841 if (!a->receiver_conf)
842 return -E_RECV_SYNTAX;
843 a->receiver = &receivers[receiver_num];
844 }
845 ret = 1;
846 out:
847 free(cmd);
848 return ret;
849 }
850
851 static int init_default_filters(void)
852 {
853 int i, ret = 1;
854
855 FOR_EACH_AUDIO_FORMAT(i) {
856 struct audio_format_info *a = &afi[i];
857 char *tmp;
858 int j;
859
860 if (a->num_filters)
861 continue; /* no default -- nothing to to */
862 /*
863 * If udp is used to receive this audiod format, add fecdec as
864 * the first filter.
865 */
866 if (strcmp(afi[i].receiver->name, "udp") == 0) {
867 tmp = para_strdup("fecdec");
868 add_filter(i, tmp);
869 free(tmp);
870 if (ret < 0)
871 goto out;
872 }
873 /* add "dec" to audio format name */
874 tmp = make_message("%sdec", audio_formats[i]);
875 for (j = 0; filters[j].name; j++)
876 if (!strcmp(tmp, filters[j].name))
877 break;
878 free(tmp);
879 ret = -E_UNSUPPORTED_FILTER;
880 if (!filters[j].name)
881 goto out;
882 tmp = para_strdup(filters[j].name);
883 ret = add_filter(i, tmp);
884 free(tmp);
885 if (ret < 0)
886 goto out;
887 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
888 filters[j].name);
889 }
890 out:
891 return ret;
892 }
893
894 static int parse_filter_args(void)
895 {
896 int i, ret, nf;
897
898 nf = PARA_MAX(2U, conf.filter_given);
899 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
900 FOR_EACH_AUDIO_FORMAT(i) {
901 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
902 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
903 }
904 if (!conf.no_default_filters_given)
905 return init_default_filters();
906 for (i = 0; i < conf.filter_given; i++) {
907 char *arg = conf.filter_arg[i];
908 char *filter_name = strchr(arg, ':');
909 ret = -E_MISSING_COLON;
910 if (!filter_name)
911 goto out;
912 *filter_name = '\0';
913 filter_name++;
914 ret = get_audio_format_num(arg);
915 if (ret < 0)
916 goto out;
917 ret = add_filter(ret, filter_name);
918 if (ret < 0)
919 goto out;
920 }
921 ret = init_default_filters(); /* use default values for the rest */
922 out:
923 return ret;
924 }
925
926 static int parse_stream_args(void)
927 {
928 int ret;
929
930 ret = parse_receiver_args();
931 if (ret < 0)
932 return ret;
933 ret = parse_filter_args();
934 if (ret < 0)
935 return ret;
936 ret = parse_writer_args();
937 if (ret < 0)
938 return ret;
939 return 1;
940 }
941
942 /* does not unlink socket on errors */
943 static int audiod_get_socket(void)
944 {
945 struct sockaddr_un unix_addr;
946 int ret, fd;
947
948 if (conf.socket_given)
949 socket_name = para_strdup(conf.socket_arg);
950 else {
951 char *hn = para_hostname();
952 socket_name = make_message("/var/paraslash/audiod_socket.%s",
953 hn);
954 free(hn);
955 }
956 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
957 if (conf.force_given)
958 unlink(socket_name);
959 ret = create_local_socket(socket_name, &unix_addr,
960 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
961 if (ret < 0)
962 goto err;
963 fd = ret;
964 if (listen(fd , 5) < 0) {
965 ret = -ERRNO_TO_PARA_ERROR(errno);
966 goto err;
967 }
968 ret = mark_fd_nonblocking(fd);
969 if (ret < 0)
970 goto err;
971 return fd;
972 err:
973 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
974 exit(EXIT_FAILURE);
975 }
976
977 static void signal_pre_select(struct sched *s, struct task *t)
978 {
979 struct signal_task *st = container_of(t, struct signal_task, task);
980 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
981 }
982
983 static void signal_post_select(struct sched *s, struct task *t)
984 {
985 struct signal_task *st = container_of(t, struct signal_task, task);
986
987 if (!FD_ISSET(st->fd, &s->rfds))
988 return;
989
990 st->signum = para_next_signal();
991 switch (st->signum) {
992 case SIGINT:
993 case SIGTERM:
994 case SIGHUP:
995 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
996 clean_exit(EXIT_FAILURE, "caught deadly signal");
997 }
998 }
999
1000 static void signal_setup_default(struct signal_task *st)
1001 {
1002 st->task.pre_select = signal_pre_select;
1003 st->task.post_select = signal_post_select;
1004 sprintf(st->task.status, "signal task");
1005 }
1006
1007 static void command_pre_select(struct sched *s, struct task *t)
1008 {
1009 struct command_task *ct = container_of(t, struct command_task, task);
1010 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1011 }
1012
1013 static void command_post_select(struct sched *s, struct task *t)
1014 {
1015 int ret;
1016 struct command_task *ct = container_of(t, struct command_task, task);
1017 static struct timeval last_status_dump;
1018 struct timeval tmp, delay = {0, 500 * 1000};
1019
1020 tv_add(&last_status_dump, &delay, &tmp);
1021 if (tv_diff(&tmp, now, NULL) < 0) {
1022 audiod_status_dump();
1023 last_status_dump = *now;
1024 }
1025
1026 ret = handle_connect(ct->fd, &s->rfds);
1027 if (ret < 0)
1028 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1029 audiod_status_dump();
1030 }
1031
1032 static void init_command_task(struct command_task *ct)
1033 {
1034 ct->task.pre_select = command_pre_select;
1035 ct->task.post_select = command_post_select;
1036 ct->task.error = 0;
1037 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1038 sprintf(ct->task.status, "command task");
1039 }
1040
1041 static void close_stat_pipe(void)
1042 {
1043 if (!stat_task->ct)
1044 return;
1045 btr_free_node(stat_task->ct->btrn);
1046 client_close(stat_task->ct);
1047 stat_task->ct = NULL;
1048 clear_and_dump_items();
1049 stat_task->length_seconds = 0;
1050 stat_task->offset_seconds = 0;
1051 stat_task->vss_status = 0;
1052 stat_task->current_audio_format_num = -1;
1053 audiod_status_dump();
1054 }
1055
1056 /**
1057 * close the connection to para_server and exit
1058 *
1059 * \param status the exit status which is passed to exit(3)
1060 * \param msg the log message
1061 *
1062 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1063 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1064 * EXIT_FAILURE.
1065 *
1066 * \sa exit(3)
1067 */
1068 void __noreturn clean_exit(int status, const char *msg)
1069 {
1070 PARA_EMERG_LOG("%s\n", msg);
1071 if (socket_name)
1072 unlink(socket_name);
1073 close_stat_pipe();
1074 exit(status);
1075 }
1076
1077 /* avoid busy loop if server is down */
1078 static void set_stat_task_restart_barrier(unsigned seconds)
1079 {
1080 struct timeval delay = {seconds, 0};
1081 tv_add(now, &delay, &stat_task->restart_barrier);
1082 }
1083
1084 static void try_to_close_slot(int slot_num)
1085 {
1086 struct slot_info *s = &slot[slot_num];
1087 struct audio_format_info *a = afi + s->format;
1088 int i;
1089
1090 if (s->format < 0)
1091 return;
1092 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1093 return;
1094 for (i = 0; i < a->num_filters; i++)
1095 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1096 return;
1097 if (a->num_writers > 0) {
1098 for (i = 0; i < a->num_writers; i++)
1099 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1100 return;
1101 } else {
1102 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1103 return;
1104 }
1105 PARA_INFO_LOG("closing slot %d\n", slot_num);
1106 close_writers(s);
1107 close_filters(s);
1108 close_receiver(slot_num);
1109 clear_slot(slot_num);
1110 }
1111
1112 /*
1113 * Check if any receivers/filters/writers need to be started and do so if
1114 * necessary.
1115 */
1116 static void start_stop_decoders(void)
1117 {
1118 int i, ret;
1119 struct slot_info *sl;
1120 struct audio_format_info *a;
1121
1122 FOR_EACH_SLOT(i)
1123 try_to_close_slot(i);
1124 if (audiod_status != AUDIOD_ON ||
1125 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1126 return kill_all_decoders(-E_NOT_PLAYING);
1127 if (!must_start_decoder())
1128 return;
1129 ret = open_receiver(stat_task->current_audio_format_num);
1130 if (ret < 0) {
1131 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1132 return;
1133 }
1134 sl = slot + ret;
1135 a = afi + sl->format;
1136 if (a->num_filters)
1137 open_filters(sl);
1138 open_writers(sl);
1139 activate_grab_clients();
1140 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1141 }
1142
1143 static void status_pre_select(struct sched *s, struct task *t)
1144 {
1145 struct status_task *st = container_of(t, struct status_task, task);
1146 int ret, cafn = stat_task->current_audio_format_num;
1147
1148 if (must_start_decoder())
1149 goto min_delay;
1150 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1151 if (ret > 0)
1152 goto min_delay;
1153 if (st->ct && audiod_status == AUDIOD_OFF)
1154 goto min_delay;
1155 if (!st->ct && audiod_status != AUDIOD_OFF)
1156 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1157 if (cafn >= 0)
1158 sched_request_barrier(&afi[cafn].restart_barrier, s);
1159 /*
1160 * If para_server is playing we'd like to have a smooth time display
1161 * even if we are running in standby mode. So we request a timeout that
1162 * expires at the next full second.
1163 */
1164 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1165 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1166 return;
1167 min_delay:
1168 sched_min_delay(s);
1169 }
1170
1171 /* restart the client task if necessary */
1172 static void status_post_select(__a_unused struct sched *s, struct task *t)
1173 {
1174 struct status_task *st = container_of(t, struct status_task, task);
1175
1176 if (audiod_status == AUDIOD_OFF) {
1177 if (!st->ct)
1178 goto out;
1179 if (st->ct->task.error >= 0) {
1180 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1181 goto out;
1182 }
1183 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1184 goto out;
1185 close_stat_pipe();
1186 st->clock_diff_count = conf.clock_diff_count_arg;
1187 goto out;
1188 }
1189 if (st->ct) {
1190 char *buf;
1191 size_t sz;
1192 int ret;
1193 if (st->ct->task.error < 0) {
1194 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1195 goto out;
1196 close_stat_pipe();
1197 goto out;
1198 }
1199 if (st->ct->status != CL_RECEIVING)
1200 goto out;
1201 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1202 if (ret <= 0) {
1203 struct timeval diff;
1204 tv_diff(now, &st->last_status_read, &diff);
1205 if (diff.tv_sec > 61)
1206 kill_btrn(st->ct->btrn, &st->ct->task,
1207 -E_STATUS_TIMEOUT);
1208 goto out;
1209 }
1210 btr_merge(st->btrn, st->min_iqs);
1211 sz = btr_next_buffer(st->btrn, &buf);
1212 ret = for_each_stat_item(buf, sz, update_item);
1213 if (ret < 0) {
1214 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1215 goto out;
1216 }
1217 if (sz != ret) {
1218 btr_consume(st->btrn, sz - ret);
1219 st->last_status_read = *now;
1220 st->min_iqs = 0;
1221 } else /* current status item crosses buffers */
1222 st->min_iqs = sz + 1;
1223 goto out;
1224 }
1225 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1226 goto out;
1227 if (st->clock_diff_count) { /* get status only one time */
1228 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1229 int argc = 5;
1230 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1231 st->clock_diff_count--;
1232 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1233 set_stat_task_restart_barrier(2);
1234
1235 } else {
1236 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1237 int argc = 4;
1238 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1239 set_stat_task_restart_barrier(5);
1240 }
1241 free(stat_item_values[SI_BASENAME]);
1242 stat_item_values[SI_BASENAME] = para_strdup(
1243 "no connection to para_server");
1244 stat_client_write_item(SI_BASENAME);
1245 st->last_status_read = *now;
1246 out:
1247 start_stop_decoders();
1248 }
1249
1250 static void init_status_task(struct status_task *st)
1251 {
1252 memset(st, 0, sizeof(struct status_task));
1253 st->task.pre_select = status_pre_select;
1254 st->task.post_select = status_post_select;
1255 st->sa_time_diff_sign = 1;
1256 st->clock_diff_count = conf.clock_diff_count_arg;
1257 st->current_audio_format_num = -1;
1258 sprintf(st->task.status, "stat");
1259 st->btrn = btr_new_node(&(struct btr_node_description)
1260 EMBRACE(.name = "stat"));
1261 }
1262
1263 static void set_initial_status(void)
1264 {
1265 audiod_status = AUDIOD_ON;
1266 if (!conf.mode_given)
1267 return;
1268 if (!strcmp(conf.mode_arg, "sb")) {
1269 audiod_status = AUDIOD_STANDBY;
1270 return;
1271 }
1272 if (!strcmp(conf.mode_arg, "off")) {
1273 audiod_status = AUDIOD_OFF;
1274 return;
1275 }
1276 if (strcmp(conf.mode_arg, "on"))
1277 PARA_WARNING_LOG("invalid mode\n");
1278 }
1279
1280 __noreturn static void print_help_and_die(void)
1281 {
1282 int d = conf.detailed_help_given;
1283 const char **p = d? audiod_args_info_detailed_help
1284 : audiod_args_info_help;
1285
1286 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1287 AUDIOD_CMDLINE_PARSER_VERSION);
1288 printf_or_die("%s\n\n", audiod_args_info_usage);
1289 for (; *p; p++)
1290 printf_or_die("%s\n", *p);
1291 print_receiver_helps(d);
1292 print_filter_helps(d);
1293 print_writer_helps(d);
1294 exit(0);
1295 }
1296
1297 static void init_colors_or_die(void)
1298 {
1299 int ret, i;
1300
1301 if (!want_colors())
1302 return;
1303 daemon_set_default_log_colors();
1304 daemon_set_flag(DF_COLOR_LOG);
1305 for (i = 0; i < conf.log_color_given; i++) {
1306 ret = daemon_set_log_color(conf.log_color_arg[i]);
1307 if (ret < 0)
1308 exit(EXIT_FAILURE);
1309 }
1310 }
1311
1312 /**
1313 * the main function of para_audiod
1314 *
1315 * \param argc usual argument count
1316 * \param argv usual argument vector
1317 *
1318 * \return EXIT_SUCCESS or EXIT_FAILURE
1319 *
1320 * \sa para_audiod(1)
1321 * */
1322 int main(int argc, char *argv[])
1323 {
1324 int ret, i;
1325 static struct sched s;
1326 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1327 struct audiod_cmdline_parser_params params = {
1328 .override = 0,
1329 .initialize = 1,
1330 .check_required = 0,
1331 .check_ambiguity = 0,
1332 .print_errors = 1
1333 };
1334
1335 valid_fd_012();
1336 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1337 exit(EXIT_FAILURE);
1338 HANDLE_VERSION_FLAG("audiod", conf);
1339 /* init receivers/filters/writers early to make help work */
1340 recv_init();
1341 filter_init();
1342 writer_init();
1343 if (conf.help_given || conf.detailed_help_given)
1344 print_help_and_die();
1345 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1346 parse_config_or_die();
1347 init_colors_or_die();
1348 init_random_seed_or_die();
1349 daemon_set_flag(DF_LOG_TIME);
1350 daemon_set_flag(DF_LOG_HOSTNAME);
1351 daemon_set_flag(DF_LOG_LL);
1352 if (conf.log_timing_given)
1353 daemon_set_flag(DF_LOG_TIMING);
1354 if (conf.logfile_given) {
1355 daemon_set_logfile(conf.logfile_arg);
1356 daemon_open_log_or_die();
1357 }
1358 ret = parse_stream_args();
1359 if (ret < 0) {
1360 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1361 exit(EXIT_FAILURE);
1362 }
1363 log_welcome("para_audiod");
1364 server_uptime(UPTIME_SET);
1365 set_initial_status();
1366 FOR_EACH_SLOT(i)
1367 clear_slot(i);
1368 setup_signal_handling();
1369 signal_setup_default(sig_task);
1370
1371 init_status_task(stat_task);
1372 init_command_task(cmd_task);
1373
1374 if (conf.daemon_given)
1375 daemonize();
1376
1377 register_task(&sig_task->task);
1378 register_task(&cmd_task->task);
1379 register_task(&stat_task->task);
1380 s.default_timeout.tv_sec = 2;
1381 s.default_timeout.tv_usec = 999 * 1000;
1382 ret = schedule(&s);
1383
1384 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1385 return EXIT_FAILURE;
1386 }