Merge branch 'maint'
[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 /** The offset value announced by para_server. */
96 int offset_seconds;
97 /** The length of the current audio file as announced by para_server. */
98 int length_seconds;
99 /** The start of the current stream from the view of para_server. */
100 struct timeval server_stream_start;
101 /** The average time deviation between para_server and para_audiod. */
102 struct timeval sa_time_diff;
103 /** Whether client time is ahead of server time. */
104 int sa_time_diff_sign;
105 /** The 'P' and the 'N' flags as announced by para_server. */
106 enum vss_status_flags vss_status;
107 /** Number of times the clock difference is to be checked. */
108 unsigned clock_diff_count;
109 /** When to start the next check for clock difference. */
110 struct timeval clock_diff_barrier;
111 /** Number of the audio format as announced by para_server. */
112 int current_audio_format_num;
113 /* The status task btrn is the child of the client task. */
114 struct btr_node *btrn;
115 };
116
117 /** The array of status items sent by para_server. */
118 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
119
120 /**
121 * the current mode of operation of which can be changed by the on/off/cycle
122 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
123 */
124 int audiod_status = AUDIOD_ON;
125
126 /**
127 * the gengetopt args_info struct that holds information on all command line
128 * arguments
129 */
130 struct audiod_args_info conf;
131
132 static char *socket_name;
133 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
134
135 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
136
137 static struct status_task status_task_struct;
138
139 /**
140 * the task that calls the status command of para_server
141 *
142 * \sa struct status_task
143 */
144 static struct status_task *stat_task = &status_task_struct;
145
146 /**
147 * the task for handling audiod commands
148 *
149 * \sa struct task, struct sched
150 */
151 struct command_task {
152 /** the local listening socket */
153 int fd;
154 /** the associated task structure */
155 struct task task;
156 };
157
158 /** iterate over all supported audio formats */
159 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
160
161 /**
162 * Get the audio format number.
163 *
164 * \param name The name of the audio format.
165 *
166 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
167 * \a name is not a supported audio format.
168 */
169 int get_audio_format_num(const char *name)
170 {
171 int i;
172
173 while (para_isspace(*name))
174 name++;
175 FOR_EACH_AUDIO_FORMAT(i)
176 if (!strcmp(name, audio_formats[i]))
177 return i;
178 return -E_UNSUPPORTED_AUDIO_FORMAT;
179 }
180
181 /**
182 * Compute the play time based on information of the given slot.
183 *
184 * \param slot_num The slot number (negative means: no slot).
185 *
186 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
187 * from the status items received from para_server and the start time of the
188 * (first) writer of the given slot.
189 *
190 * It has to to take into account that probably the stream was not started at
191 * the beginning of the file, that the clock between the server and the client
192 * host may differ and that playback of the stream was delayed, e.g. because
193 * the prebuffer filter is used in the filter chain of the given slot.
194 *
195 * If no writer is active in the given slot, or \a slot_num is negative
196 * (indicating that para_audiod runs in standby mode), an approximation based
197 * only on the status items is computed and the returned string is prefixed
198 * with "~".
199 *
200 * \return A string that must be freed by the caller.
201 */
202 char *get_time_string(int slot_num)
203 {
204 int ret, seconds = 0, length;
205 struct timeval *tmp, sum, sss, /* server stream start */
206 rstime, /* receiver start time */
207 wstime, /* writer start time */
208 wtime, /* now - writer start */
209 rskip; /* receiver start - sss */
210 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
211 char *msg;
212
213 if (audiod_status == AUDIOD_OFF)
214 goto empty;
215 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
216 if (stat_task->length_seconds) /* paused */
217 return NULL;
218 goto empty; /* stopped */
219 }
220 if (audiod_status == AUDIOD_ON && !s)
221 goto empty;
222 /*
223 * Valid status items and playing, set length and tmp to the stream
224 * start. We use the slot info and fall back to the info from current
225 * status items if no slot info is available.
226 */
227 length = stat_task->length_seconds;
228 tmp = &stat_task->server_stream_start;
229 if (s && s->wns) { /* writer active in this slot */
230 btr_get_node_start(s->wns[0].btrn, &wstime);
231 if (wstime.tv_sec != 0) { /* writer wrote something */
232 if (s->server_stream_start.tv_sec == 0) {
233 /* copy status info to slot */
234 s->server_stream_start = stat_task->server_stream_start;
235 s->offset_seconds = stat_task->offset_seconds;
236 s->seconds_total = stat_task->length_seconds;
237 }
238 length = s->seconds_total;
239 tmp = &s->server_stream_start;
240 }
241 }
242 if (stat_task->sa_time_diff_sign > 0)
243 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
244 else
245 tv_add(tmp, &stat_task->sa_time_diff, &sss);
246 if (!s || !s->wns) {
247 struct timeval diff;
248 tv_diff(now, &sss, &diff);
249 seconds = diff.tv_sec + stat_task->offset_seconds;
250 goto out;
251 }
252 tv_diff(now, &wstime, &wtime);
253 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
254 seconds = s->offset_seconds;
255 btr_get_node_start(s->receiver_node->btrn, &rstime);
256 ret = tv_diff(&rstime, &sss, &rskip);
257 if (ret > 0) { /* audiod was started in the middle of the stream */
258 tv_add(&wtime, &rskip, &sum);
259 seconds += sum.tv_sec;
260 } else
261 seconds += wtime.tv_sec;
262 out:
263 seconds = PARA_MIN(seconds, length);
264 seconds = PARA_MAX(seconds, 0);
265 msg = make_message(
266 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
267 s? "" : "~",
268 seconds / 60,
269 seconds % 60,
270 (length - seconds) / 60,
271 (length - seconds) % 60,
272 length? (seconds * 100 + length / 2) / length : 0,
273 length / 60,
274 length % 60
275 );
276 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
277 return msg;
278 empty:
279 return para_strdup(NULL);
280 }
281
282 static int want_colors(void)
283 {
284 if (conf.color_arg == color_arg_no)
285 return 0;
286 if (conf.color_arg == color_arg_yes)
287 return 1;
288 if (conf.logfile_given)
289 return 0;
290 return isatty(STDERR_FILENO);
291 }
292
293 static void parse_config_or_die(void)
294 {
295 int ret;
296 char *config_file;
297 struct audiod_cmdline_parser_params params = {
298 .override = 0,
299 .initialize = 0,
300 .check_required = 1,
301 .check_ambiguity = 0,
302 .print_errors = 1
303 };
304
305 if (conf.config_file_given)
306 config_file = para_strdup(conf.config_file_arg);
307 else {
308 char *home = para_homedir();
309 config_file = make_message("%s/.paraslash/audiod.conf", home);
310 free(home);
311 }
312 ret = file_exists(config_file);
313 if (conf.config_file_given && !ret) {
314 PARA_EMERG_LOG("can not read config file %s\n", config_file);
315 goto err;
316 }
317 if (ret)
318 audiod_cmdline_parser_config_file(config_file, &conf, &params);
319 free(config_file);
320 daemon_set_loglevel(conf.loglevel_arg);
321 return;
322 err:
323 free(config_file);
324 exit(EXIT_FAILURE);
325 }
326
327 static void setup_signal_handling(void)
328 {
329 sig_task->fd = para_signal_init();
330 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
331 para_install_sighandler(SIGINT);
332 para_install_sighandler(SIGTERM);
333 para_install_sighandler(SIGHUP);
334 para_sigaction(SIGPIPE, SIG_IGN);
335 }
336
337 static void clear_slot(int slot_num)
338 {
339 struct slot_info *s = &slot[slot_num];
340
341 PARA_INFO_LOG("clearing slot %d\n", slot_num);
342 memset(s, 0, sizeof(struct slot_info));
343 s->format = -1;
344 }
345
346 static void close_receiver(int slot_num)
347 {
348 struct slot_info *s = &slot[slot_num];
349 struct audio_format_info *a;
350
351 if (s->format < 0 || !s->receiver_node)
352 return;
353 a = &afi[s->format];
354 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
355 audio_formats[s->format], slot_num);
356 a->receiver->close(s->receiver_node);
357 btr_free_node(s->receiver_node->btrn);
358 free(s->receiver_node);
359 s->receiver_node = NULL;
360 }
361
362 static void writer_cleanup(struct writer_node *wn)
363 {
364 struct writer *w;
365
366 if (!wn)
367 return;
368 w = writers + wn->writer_num;
369 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
370 w->close(wn);
371 btr_free_node(wn->btrn);
372 }
373
374 static void close_writers(struct slot_info *s)
375 {
376 struct audio_format_info *a;
377 int i;
378
379 if (s->format < 0)
380 return;
381 assert(s->wns);
382 a = afi + s->format;
383 if (a->num_writers == 0)
384 writer_cleanup(s->wns);
385 else {
386 for (i = 0; i < a->num_writers; i++)
387 writer_cleanup(s->wns + i);
388 }
389 free(s->wns);
390 s->wns = NULL;
391 }
392
393 static void close_filters(struct slot_info *s)
394 {
395 int i;
396 struct audio_format_info *a = afi + s->format;
397 if (a->num_filters == 0)
398 return;
399 for (i = 0; i < a->num_filters; i++) {
400 struct filter_node *fn = s->fns + i;
401 struct filter *f;
402
403 if (!fn)
404 continue;
405 f = filters + fn->filter_num;
406 if (f->close)
407 f->close(fn);
408 btr_free_node(fn->btrn);
409 }
410 free(s->fns);
411 s->fns = NULL;
412 }
413
414 /*
415 * Whenever a task commits suicide by returning from post_select with t->error
416 * < 0, it also removes its btr node. We do exactly that to kill a running
417 * task. Note that the scheduler checks t->error also _before_ each pre/post
418 * select call, so the victim will never be scheduled again.
419 */
420 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
421 {
422 if (t->error < 0)
423 return;
424 t->error = error;
425 btr_remove_node(btrn);
426 }
427
428 static void kill_all_decoders(int error)
429 {
430 int i, j;
431
432 FOR_EACH_SLOT(i) {
433 struct slot_info *s = &slot[i];
434 struct audio_format_info *a;
435 if (s->format < 0)
436 continue;
437 a = afi + s->format;
438 if (s->wns)
439 for (j = 0; j < a->num_writers; j++)
440 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
441 if (s->fns)
442 for (j = 0; j < a->num_writers; j++)
443 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
444 if (s->receiver_node)
445 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
446 error);
447 }
448 }
449
450 static int get_empty_slot(void)
451 {
452 int i;
453 struct slot_info *s;
454
455 FOR_EACH_SLOT(i) {
456 s = &slot[i];
457 if (s->format < 0) {
458 clear_slot(i);
459 return i;
460 }
461 if (s->wns || s->receiver_node || s->fns)
462 continue;
463 clear_slot(i);
464 return i;
465 }
466 return -E_NO_MORE_SLOTS;
467 }
468
469 /**
470 * get the number of filters
471 *
472 * \param audio_format_num the number identifying the audio format
473 *
474 * \return the number of filters for the given audio format
475 *
476 * \sa struct filter;
477 */
478 int num_filters(int audio_format_num)
479 {
480 return afi[audio_format_num].num_filters;
481 }
482
483 static void open_filters(struct slot_info *s)
484 {
485 struct audio_format_info *a = afi + s->format;
486 struct filter_node *fn;
487 int nf = a->num_filters;
488 struct btr_node *parent;
489 int i;
490
491 if (nf == 0)
492 return;
493 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
494 assert(s->fns == NULL);
495 s->fns = para_calloc(nf * sizeof(struct filter_node));
496 parent = s->receiver_node->btrn;
497 for (i = 0; i < nf; i++) {
498 struct filter *f = filters + a->filter_nums[i];
499 fn = s->fns + i;
500 fn->filter_num = a->filter_nums[i];
501 fn->conf = a->filter_conf[i];
502 fn->task.pre_select = f->pre_select;
503 fn->task.post_select = f->post_select;
504
505 fn->btrn = btr_new_node(&(struct btr_node_description)
506 EMBRACE(.name = f->name, .parent = parent,
507 .handler = f->execute, .context = fn));
508
509 f->open(fn);
510 register_task(&fn->task);
511 parent = fn->btrn;
512 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
513 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
514 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
515 }
516 }
517
518 static void open_writers(struct slot_info *s)
519 {
520 int i;
521 struct audio_format_info *a = afi + s->format;
522 struct writer_node *wn;
523 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
524
525 assert(s->wns == NULL);
526 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
527 * sizeof(struct writer_node));
528 if (a->num_writers == 0)
529 setup_writer_node(NULL, parent, s->wns);
530 else {
531 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
532 for (i = 0; i < a->num_writers; i++) {
533 wn = s->wns + i;
534 wn->conf = a->writer_conf[i];
535 wn->writer_num = a->writer_nums[i];
536 register_writer_node(wn, parent);
537 }
538 }
539 }
540
541 /* returns slot num on success */
542 static int open_receiver(int format)
543 {
544 struct audio_format_info *a = &afi[format];
545 struct slot_info *s;
546 int ret, slot_num;
547 struct receiver *r = a->receiver;
548 struct receiver_node *rn;
549
550 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
551 ret = get_empty_slot();
552 if (ret < 0)
553 return ret;
554 slot_num = ret;
555 rn = para_calloc(sizeof(*rn));
556 rn->receiver = r;
557 rn->conf = a->receiver_conf;
558 rn->btrn = btr_new_node(&(struct btr_node_description)
559 EMBRACE(.name = r->name, .context = rn));
560 ret = r->open(rn);
561 if (ret < 0) {
562 btr_free_node(rn->btrn);
563 free(rn);
564 return ret;
565 }
566 s = &slot[slot_num];
567 s->format = format;
568 s->receiver_node = rn;
569 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
570 audio_formats[format], r->name, slot_num);
571 rn->task.pre_select = r->pre_select;
572 rn->task.post_select = r->post_select;
573 sprintf(rn->task.status, "%s receiver node", r->name);
574 register_task(&rn->task);
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 (s->receiver_node->task.error >= 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 (s->receiver_node->task.error < 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 (cafn < 0)
636 return false;
637 if (!stat_task->ct)
638 return false;
639 if (vs & VSS_STATUS_FLAG_NEXT)
640 return false;
641 if (!(vs & VSS_STATUS_FLAG_PLAYING))
642 return false;
643 if (receiver_running())
644 return false;
645 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
646 return false;
647 return true;
648 }
649
650 static unsigned compute_time_diff(const struct timeval *status_time)
651 {
652 struct timeval tmp, diff;
653 static unsigned count;
654 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
655 const struct timeval max_deviation = {0, 500 * 1000};
656 const int time_smooth = 5;
657
658 if (!status_time)
659 return count;
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 return count;
690 }
691
692 static int update_item(int itemnum, char *buf)
693 {
694 long unsigned sec, usec;
695
696 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
697 return 1;
698 free(stat_item_values[itemnum]);
699 stat_item_values[itemnum] = para_strdup(buf);
700 stat_client_write_item(itemnum);
701 switch (itemnum) {
702 case SI_STATUS_FLAGS:
703 stat_task->vss_status = 0;
704 if (strchr(buf, 'N'))
705 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
706 if (strchr(buf, 'P'))
707 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
708 break;
709 case SI_OFFSET:
710 stat_task->offset_seconds = atoi(buf);
711 break;
712 case SI_SECONDS_TOTAL:
713 stat_task->length_seconds = atoi(buf);
714 break;
715 case SI_STREAM_START:
716 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
717 stat_task->server_stream_start.tv_sec = sec;
718 stat_task->server_stream_start.tv_usec = usec;
719 }
720 break;
721 case SI_CURRENT_TIME:
722 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
723 struct timeval tv = {sec, usec};
724 compute_time_diff(&tv);
725 }
726 break;
727 case SI_FORMAT:
728 stat_task->current_audio_format_num
729 = get_audio_format_num(buf);
730 }
731 return 1;
732 }
733
734 static int parse_stream_command(const char *txt, char **cmd)
735 {
736 char *p = strchr(txt, ':');
737 int i;
738
739 if (!p)
740 return -E_MISSING_COLON;
741 p++;
742 FOR_EACH_AUDIO_FORMAT(i) {
743 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
744 continue;
745 *cmd = p;
746 return i;
747 }
748 return -E_UNSUPPORTED_AUDIO_FORMAT;
749 }
750
751 static int add_filter(int format, char *cmdline)
752 {
753 struct audio_format_info *a = &afi[format];
754 int filter_num, nf = a->num_filters;
755
756 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
757 if (filter_num < 0)
758 return filter_num;
759 a->filter_nums[nf] = filter_num;
760 a->num_filters++;
761 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
762 filters[filter_num].name);
763 return filter_num;
764 }
765
766 static int parse_writer_args(void)
767 {
768 int i, ret, nw;
769 char *cmd;
770 struct audio_format_info *a;
771
772 nw = PARA_MAX(1U, conf.writer_given);
773 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
774 FOR_EACH_AUDIO_FORMAT(i) {
775 a = &afi[i];
776 a->writer_conf = para_malloc(nw * sizeof(void *));
777 a->writer_nums = para_malloc(nw * sizeof(int));
778 a->num_writers = 0;
779 }
780 for (i = 0; i < conf.writer_given; i++) {
781 void *wconf;
782 int writer_num;
783 ret = parse_stream_command(conf.writer_arg[i], &cmd);
784 if (ret < 0)
785 goto out;
786 a = &afi[ret];
787 nw = a->num_writers;
788 wconf = check_writer_arg(cmd, &writer_num);
789 if (!wconf) {
790 ret = writer_num;
791 goto out;
792 }
793 a->writer_nums[nw] = writer_num;
794 a->writer_conf[nw] = wconf;
795 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
796 nw, writer_names[writer_num]);
797 a->num_writers++;
798 }
799 ret = 1;
800 out:
801 return ret;
802 }
803
804 static int parse_receiver_args(void)
805 {
806 int i, ret, receiver_num;
807 char *cmd = NULL;
808 struct audio_format_info *a;
809
810 for (i = conf.receiver_given - 1; i >= 0; i--) {
811 char *arg = conf.receiver_arg[i];
812 char *recv_arg = strchr(arg, ':');
813 ret = -E_MISSING_COLON;
814 if (!recv_arg)
815 goto out;
816 *recv_arg = '\0';
817 recv_arg++;
818 ret = get_audio_format_num(arg);
819 if (ret < 0)
820 goto out;
821 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
822 if (!afi[ret].receiver_conf) {
823 ret = -E_RECV_SYNTAX;
824 goto out;
825 }
826 afi[ret].receiver = &receivers[receiver_num];
827 }
828 /* use the first available receiver with no arguments
829 * for those audio formats for which no receiver
830 * was specified
831 */
832 cmd = para_strdup(receivers[0].name);
833 FOR_EACH_AUDIO_FORMAT(i) {
834 a = &afi[i];
835 if (a->receiver_conf)
836 continue;
837 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
838 if (!a->receiver_conf)
839 return -E_RECV_SYNTAX;
840 a->receiver = &receivers[receiver_num];
841 }
842 ret = 1;
843 out:
844 free(cmd);
845 return ret;
846 }
847
848 static int init_default_filters(void)
849 {
850 int i, ret = 1;
851
852 FOR_EACH_AUDIO_FORMAT(i) {
853 struct audio_format_info *a = &afi[i];
854 char *tmp;
855 int j;
856
857 if (a->num_filters)
858 continue; /* no default -- nothing to to */
859 /*
860 * If udp is used to receive this audiod format, add fecdec as
861 * the first filter.
862 */
863 if (strcmp(afi[i].receiver->name, "udp") == 0) {
864 tmp = para_strdup("fecdec");
865 add_filter(i, tmp);
866 free(tmp);
867 if (ret < 0)
868 goto out;
869 }
870 /* add "dec" to audio format name */
871 tmp = make_message("%sdec", audio_formats[i]);
872 for (j = 0; filters[j].name; j++)
873 if (!strcmp(tmp, filters[j].name))
874 break;
875 free(tmp);
876 ret = -E_UNSUPPORTED_FILTER;
877 if (!filters[j].name)
878 goto out;
879 tmp = para_strdup(filters[j].name);
880 ret = add_filter(i, tmp);
881 free(tmp);
882 if (ret < 0)
883 goto out;
884 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
885 filters[j].name);
886 }
887 out:
888 return ret;
889 }
890
891 static int parse_filter_args(void)
892 {
893 int i, ret, nf;
894
895 nf = PARA_MAX(2U, conf.filter_given);
896 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
897 FOR_EACH_AUDIO_FORMAT(i) {
898 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
899 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
900 }
901 if (!conf.no_default_filters_given)
902 return init_default_filters();
903 for (i = 0; i < conf.filter_given; i++) {
904 char *arg = conf.filter_arg[i];
905 char *filter_name = strchr(arg, ':');
906 ret = -E_MISSING_COLON;
907 if (!filter_name)
908 goto out;
909 *filter_name = '\0';
910 filter_name++;
911 ret = get_audio_format_num(arg);
912 if (ret < 0)
913 goto out;
914 ret = add_filter(ret, filter_name);
915 if (ret < 0)
916 goto out;
917 }
918 ret = init_default_filters(); /* use default values for the rest */
919 out:
920 return ret;
921 }
922
923 static int parse_stream_args(void)
924 {
925 int ret;
926
927 ret = parse_receiver_args();
928 if (ret < 0)
929 return ret;
930 ret = parse_filter_args();
931 if (ret < 0)
932 return ret;
933 ret = parse_writer_args();
934 if (ret < 0)
935 return ret;
936 return 1;
937 }
938
939 /* does not unlink socket on errors */
940 static int audiod_get_socket(void)
941 {
942 struct sockaddr_un unix_addr;
943 int ret, fd;
944
945 if (conf.socket_given)
946 socket_name = para_strdup(conf.socket_arg);
947 else {
948 char *hn = para_hostname();
949 socket_name = make_message("/var/paraslash/audiod_socket.%s",
950 hn);
951 free(hn);
952 }
953 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
954 if (conf.force_given)
955 unlink(socket_name);
956 ret = create_local_socket(socket_name, &unix_addr,
957 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
958 if (ret < 0)
959 goto err;
960 fd = ret;
961 if (listen(fd , 5) < 0) {
962 ret = -ERRNO_TO_PARA_ERROR(errno);
963 goto err;
964 }
965 ret = mark_fd_nonblocking(fd);
966 if (ret < 0)
967 goto err;
968 return fd;
969 err:
970 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
971 exit(EXIT_FAILURE);
972 }
973
974 static void signal_pre_select(struct sched *s, struct task *t)
975 {
976 struct signal_task *st = container_of(t, struct signal_task, task);
977 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
978 }
979
980 static void signal_post_select(struct sched *s, struct task *t)
981 {
982 struct signal_task *st = container_of(t, struct signal_task, task);
983
984 if (!FD_ISSET(st->fd, &s->rfds))
985 return;
986
987 st->signum = para_next_signal();
988 switch (st->signum) {
989 case SIGINT:
990 case SIGTERM:
991 case SIGHUP:
992 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
993 clean_exit(EXIT_FAILURE, "caught deadly signal");
994 }
995 }
996
997 static void signal_setup_default(struct signal_task *st)
998 {
999 st->task.pre_select = signal_pre_select;
1000 st->task.post_select = signal_post_select;
1001 sprintf(st->task.status, "signal task");
1002 }
1003
1004 static void command_pre_select(struct sched *s, struct task *t)
1005 {
1006 struct command_task *ct = container_of(t, struct command_task, task);
1007 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1008 }
1009
1010 static void command_post_select(struct sched *s, struct task *t)
1011 {
1012 int ret;
1013 struct command_task *ct = container_of(t, struct command_task, task);
1014 static struct timeval last_status_dump;
1015 struct timeval tmp, delay = {0, 500 * 1000};
1016
1017 tv_add(&last_status_dump, &delay, &tmp);
1018 if (tv_diff(&tmp, now, NULL) < 0) {
1019 audiod_status_dump();
1020 last_status_dump = *now;
1021 }
1022
1023 if (!FD_ISSET(ct->fd, &s->rfds))
1024 return;
1025 ret = handle_connect(ct->fd);
1026 if (ret < 0)
1027 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1028 }
1029
1030 static void init_command_task(struct command_task *ct)
1031 {
1032 ct->task.pre_select = command_pre_select;
1033 ct->task.post_select = command_post_select;
1034 ct->task.error = 0;
1035 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1036 sprintf(ct->task.status, "command task");
1037 }
1038
1039 static void close_stat_pipe(void)
1040 {
1041 if (!stat_task->ct)
1042 return;
1043 btr_free_node(stat_task->ct->btrn);
1044 client_close(stat_task->ct);
1045 stat_task->ct = NULL;
1046 clear_and_dump_items();
1047 stat_task->length_seconds = 0;
1048 stat_task->offset_seconds = 0;
1049 stat_task->vss_status = 0;
1050 stat_task->current_audio_format_num = -1;
1051 audiod_status_dump();
1052 }
1053
1054 /**
1055 * close the connection to para_server and exit
1056 *
1057 * \param status the exit status which is passed to exit(3)
1058 * \param msg the log message
1059 *
1060 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1061 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1062 * EXIT_FAILURE.
1063 *
1064 * \sa exit(3)
1065 */
1066 void __noreturn clean_exit(int status, const char *msg)
1067 {
1068 PARA_EMERG_LOG("%s\n", msg);
1069 if (socket_name)
1070 unlink(socket_name);
1071 close_stat_pipe();
1072 exit(status);
1073 }
1074
1075 /* avoid busy loop if server is down */
1076 static void set_stat_task_restart_barrier(unsigned seconds)
1077 {
1078 struct timeval delay = {seconds, 0};
1079 tv_add(now, &delay, &stat_task->restart_barrier);
1080 }
1081
1082 static void try_to_close_slot(int slot_num)
1083 {
1084 struct slot_info *s = &slot[slot_num];
1085 struct audio_format_info *a = afi + s->format;
1086 int i;
1087
1088 if (s->format < 0)
1089 return;
1090 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1091 return;
1092 for (i = 0; i < a->num_filters; i++)
1093 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1094 return;
1095 if (a->num_writers > 0) {
1096 for (i = 0; i < a->num_writers; i++)
1097 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1098 return;
1099 } else {
1100 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1101 return;
1102 }
1103 PARA_INFO_LOG("closing slot %d\n", slot_num);
1104 close_writers(s);
1105 close_filters(s);
1106 close_receiver(slot_num);
1107 clear_slot(slot_num);
1108 }
1109
1110 /*
1111 * Check if any receivers/filters/writers need to be started and do so if
1112 * necessary.
1113 */
1114 static void start_stop_decoders(void)
1115 {
1116 int i, ret;
1117 struct slot_info *sl;
1118 struct audio_format_info *a;
1119
1120 FOR_EACH_SLOT(i)
1121 try_to_close_slot(i);
1122 if (audiod_status != AUDIOD_ON ||
1123 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1124 return kill_all_decoders(-E_NOT_PLAYING);
1125 if (!must_start_decoder())
1126 return;
1127 ret = open_receiver(stat_task->current_audio_format_num);
1128 if (ret < 0) {
1129 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1130 return;
1131 }
1132 sl = slot + ret;
1133 a = afi + sl->format;
1134 if (a->num_filters)
1135 open_filters(sl);
1136 open_writers(sl);
1137 activate_grab_clients();
1138 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1139 }
1140
1141 static void status_pre_select(struct sched *s, struct task *t)
1142 {
1143 struct status_task *st = container_of(t, struct status_task, task);
1144 int ret, cafn = stat_task->current_audio_format_num;
1145
1146 if (must_start_decoder())
1147 goto min_delay;
1148 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1149 if (ret > 0)
1150 goto min_delay;
1151 if (!st->ct)
1152 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1153 if (cafn >= 0)
1154 sched_request_barrier(&afi[cafn].restart_barrier, s);
1155 return;
1156 min_delay:
1157 sched_min_delay(s);
1158 }
1159
1160 /* restart the client task if necessary */
1161 static void status_post_select(__a_unused struct sched *s, struct task *t)
1162 {
1163 struct status_task *st = container_of(t, struct status_task, task);
1164
1165 if (audiod_status == AUDIOD_OFF) {
1166 if (!st->ct)
1167 goto out;
1168 if (st->ct->task.error >= 0) {
1169 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1170 goto out;
1171 }
1172 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1173 goto out;
1174 close_stat_pipe();
1175 st->clock_diff_count = conf.clock_diff_count_arg;
1176 goto out;
1177 }
1178 if (st->ct) {
1179 char *buf;
1180 size_t sz;
1181 int ret;
1182 if (st->ct->task.error < 0) {
1183 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1184 goto out;
1185 close_stat_pipe();
1186 goto out;
1187 }
1188 if (st->ct->status != CL_RECEIVING)
1189 goto out;
1190 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1191 if (ret <= 0)
1192 goto out;
1193 sz = btr_next_buffer(st->btrn, &buf);
1194 ret = for_each_stat_item(buf, sz, update_item);
1195 if (ret < 0) {
1196 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1197 goto out;
1198 }
1199 if (sz != ret)
1200 st->last_status_read = *now;
1201 else {
1202 struct timeval diff;
1203 tv_diff(now, &st->last_status_read, &diff);
1204 if (diff.tv_sec > 61)
1205 kill_btrn(st->ct->btrn, &st->ct->task,
1206 -E_STATUS_TIMEOUT);
1207 }
1208 btr_consume(st->btrn, sz - ret);
1209 goto out;
1210 }
1211 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1212 goto out;
1213 if (st->clock_diff_count) { /* get status only one time */
1214 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1215 int argc = 5;
1216 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1217 st->clock_diff_count--;
1218 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1219 set_stat_task_restart_barrier(2);
1220
1221 } else {
1222 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1223 int argc = 4;
1224 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1225 set_stat_task_restart_barrier(5);
1226 }
1227 free(stat_item_values[SI_BASENAME]);
1228 stat_item_values[SI_BASENAME] = para_strdup(
1229 "no connection to para_server");
1230 stat_client_write_item(SI_BASENAME);
1231 st->last_status_read = *now;
1232 out:
1233 start_stop_decoders();
1234 }
1235
1236 static void init_status_task(struct status_task *st)
1237 {
1238 memset(st, 0, sizeof(struct status_task));
1239 st->task.pre_select = status_pre_select;
1240 st->task.post_select = status_post_select;
1241 st->sa_time_diff_sign = 1;
1242 st->clock_diff_count = conf.clock_diff_count_arg;
1243 st->current_audio_format_num = -1;
1244 sprintf(st->task.status, "stat");
1245 st->btrn = btr_new_node(&(struct btr_node_description)
1246 EMBRACE(.name = "stat"));
1247 }
1248
1249 static void set_initial_status(void)
1250 {
1251 audiod_status = AUDIOD_ON;
1252 if (!conf.mode_given)
1253 return;
1254 if (!strcmp(conf.mode_arg, "sb")) {
1255 audiod_status = AUDIOD_STANDBY;
1256 return;
1257 }
1258 if (!strcmp(conf.mode_arg, "off")) {
1259 audiod_status = AUDIOD_OFF;
1260 return;
1261 }
1262 if (strcmp(conf.mode_arg, "on"))
1263 PARA_WARNING_LOG("invalid mode\n");
1264 }
1265
1266 __noreturn static void print_help_and_die(void)
1267 {
1268 int d = conf.detailed_help_given;
1269 const char **p = d? audiod_args_info_detailed_help
1270 : audiod_args_info_help;
1271
1272 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1273 AUDIOD_CMDLINE_PARSER_VERSION);
1274 printf_or_die("%s\n\n", audiod_args_info_usage);
1275 for (; *p; p++)
1276 printf_or_die("%s\n", *p);
1277 print_receiver_helps(d);
1278 print_filter_helps(d);
1279 print_writer_helps(d);
1280 exit(0);
1281 }
1282
1283 static void init_colors_or_die(void)
1284 {
1285 int ret, i;
1286
1287 if (!want_colors())
1288 return;
1289 daemon_set_default_log_colors();
1290 daemon_set_flag(DF_COLOR_LOG);
1291 for (i = 0; i < conf.log_color_given; i++) {
1292 ret = daemon_set_log_color(conf.log_color_arg[i]);
1293 if (ret < 0)
1294 exit(EXIT_FAILURE);
1295 }
1296 }
1297
1298 /**
1299 * the main function of para_audiod
1300 *
1301 * \param argc usual argument count
1302 * \param argv usual argument vector
1303 *
1304 * \return EXIT_SUCCESS or EXIT_FAILURE
1305 *
1306 * \sa para_audiod(1)
1307 * */
1308 int main(int argc, char *argv[])
1309 {
1310 int ret, i;
1311 static struct sched s;
1312 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1313 struct audiod_cmdline_parser_params params = {
1314 .override = 0,
1315 .initialize = 1,
1316 .check_required = 0,
1317 .check_ambiguity = 0,
1318 .print_errors = 1
1319 };
1320
1321 valid_fd_012();
1322 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1323 exit(EXIT_FAILURE);
1324 HANDLE_VERSION_FLAG("audiod", conf);
1325 /* init receivers/filters/writers early to make help work */
1326 recv_init();
1327 filter_init();
1328 writer_init();
1329 if (conf.help_given || conf.detailed_help_given)
1330 print_help_and_die();
1331 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1332 parse_config_or_die();
1333 init_colors_or_die();
1334 init_random_seed_or_die();
1335 daemon_set_flag(DF_LOG_TIME);
1336 daemon_set_flag(DF_LOG_HOSTNAME);
1337 daemon_set_flag(DF_LOG_LL);
1338 if (conf.log_timing_given)
1339 daemon_set_flag(DF_LOG_TIMING);
1340 if (conf.logfile_given) {
1341 daemon_set_logfile(conf.logfile_arg);
1342 daemon_open_log_or_die();
1343 }
1344 ret = parse_stream_args();
1345 if (ret < 0) {
1346 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1347 exit(EXIT_FAILURE);
1348 }
1349 log_welcome("para_audiod");
1350 server_uptime(UPTIME_SET);
1351 set_initial_status();
1352 FOR_EACH_SLOT(i)
1353 clear_slot(i);
1354 setup_signal_handling();
1355 signal_setup_default(sig_task);
1356
1357 init_status_task(stat_task);
1358 init_command_task(cmd_task);
1359
1360 if (conf.daemon_given)
1361 daemonize();
1362
1363 register_task(&sig_task->task);
1364 register_task(&cmd_task->task);
1365 register_task(&stat_task->task);
1366 s.default_timeout.tv_sec = 2;
1367 s.default_timeout.tv_usec = 999 * 1000;
1368 ret = schedule(&s);
1369
1370 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1371 return EXIT_FAILURE;
1372 }