2bda0f69b4fc047e81f191f690682ecdb3b52db5
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2009 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 };
114
115 /** The array of status items sent by para_server. */
116 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
117
118 /**
119 * the current mode of operation of which can be changed by the on/off/cycle
120 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
121 */
122 int audiod_status = AUDIOD_ON;
123
124 /**
125 * the gengetopt args_info struct that holds information on all command line
126 * arguments
127 */
128 struct audiod_args_info conf;
129
130 static char *socket_name;
131 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
132
133 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
134
135 static struct status_task status_task_struct;
136
137 /**
138 * the task that calls the status command of para_server
139 *
140 * \sa struct status_task
141 */
142 static struct status_task *stat_task = &status_task_struct;
143 static struct timeval initial_delay_barrier;
144
145 /**
146 * the task for handling audiod commands
147 *
148 * \sa struct task, struct sched
149 */
150 struct command_task {
151 /** the local listening socket */
152 int fd;
153 /** the associated task structure */
154 struct task task;
155 };
156
157 /** iterate over all supported audio formats */
158 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
159
160 /**
161 * get the audio format number
162 * \param name the name of the audio format
163 *
164 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
165 * \a name is not a supported audio format.
166 */
167 int get_audio_format_num(const char *name)
168 {
169 int i;
170
171 while (para_isspace(*name))
172 name++;
173 FOR_EACH_AUDIO_FORMAT(i)
174 if (!strcmp(name, audio_formats[i]))
175 return i;
176 return -E_UNSUPPORTED_AUDIO_FORMAT;
177 }
178
179 char *get_time_string(int slot_num)
180 {
181 int ret, seconds = 0, length;
182 struct timeval *tmp, sum, sss, /* server stream start */
183 rstime, /* receiver start time */
184 wstime, /* writer start time */
185 wtime, /* now - writer start */
186 rskip; /* receiver start - sss */
187 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
188 char *msg;
189
190 if (audiod_status == AUDIOD_OFF)
191 goto empty;
192 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
193 if (stat_task->length_seconds) /* paused */
194 return NULL;
195 goto empty; /* stopped */
196 }
197 if (audiod_status == AUDIOD_ON && !s)
198 goto empty;
199 /*
200 * Valid status items and playing, set length and tmp to the stream
201 * start. We use the slot info and fall back to the info from current
202 * status items if no slot info is available.
203 */
204 length = stat_task->length_seconds;
205 tmp = &stat_task->server_stream_start;
206 if (s && s->wns) { /* writer active in this slot */
207 btr_get_node_start(s->wns[0].btrn, &wstime);
208 if (wstime.tv_sec != 0) { /* writer wrote something */
209 if (s->server_stream_start.tv_sec == 0) {
210 /* copy status info to slot */
211 s->server_stream_start = stat_task->server_stream_start;
212 s->offset_seconds = stat_task->offset_seconds;
213 s->seconds_total = stat_task->length_seconds;
214 }
215 length = s->seconds_total;
216 tmp = &s->server_stream_start;
217 }
218 }
219 if (stat_task->sa_time_diff_sign > 0)
220 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
221 else
222 tv_add(tmp, &stat_task->sa_time_diff, &sss);
223 if (!s || !s->wns) {
224 struct timeval diff;
225 tv_diff(now, &sss, &diff);
226 seconds = diff.tv_sec + stat_task->offset_seconds;
227 goto out;
228 }
229 tv_diff(now, &wstime, &wtime);
230 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
231 seconds = s->offset_seconds;
232 btr_get_node_start(s->receiver_node->btrn, &rstime);
233 ret = tv_diff(&rstime, &sss, &rskip);
234 if (ret > 0) { /* audiod was started in the middle of the stream */
235 tv_add(&wtime, &rskip, &sum);
236 seconds += sum.tv_sec;
237 } else
238 seconds += wtime.tv_sec;
239 out:
240 seconds = PARA_MIN(seconds, length);
241 seconds = PARA_MAX(seconds, 0);
242 msg = make_message(
243 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
244 s? "" : "~",
245 seconds / 60,
246 seconds % 60,
247 (length - seconds) / 60,
248 (length - seconds) % 60,
249 length? (seconds * 100 + length / 2) / length : 0,
250 length / 60,
251 length % 60
252 );
253 PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
254 return msg;
255 empty:
256 return para_strdup(NULL);
257 }
258
259 static int want_colors(void)
260 {
261 if (conf.color_arg == color_arg_no)
262 return 0;
263 if (conf.color_arg == color_arg_yes)
264 return 1;
265 if (conf.logfile_given)
266 return 0;
267 return isatty(STDERR_FILENO);
268 }
269
270 static void parse_config_or_die(void)
271 {
272 int ret;
273 char *config_file;
274 struct audiod_cmdline_parser_params params = {
275 .override = 0,
276 .initialize = 0,
277 .check_required = 1,
278 .check_ambiguity = 0,
279 .print_errors = 1
280 };
281
282 if (conf.config_file_given)
283 config_file = para_strdup(conf.config_file_arg);
284 else {
285 char *home = para_homedir();
286 config_file = make_message("%s/.paraslash/audiod.conf", home);
287 free(home);
288 }
289 ret = file_exists(config_file);
290 if (conf.config_file_given && !ret) {
291 PARA_EMERG_LOG("can not read config file %s\n", config_file);
292 goto err;
293 }
294 if (ret)
295 audiod_cmdline_parser_config_file(config_file, &conf, &params);
296 free(config_file);
297 daemon_set_loglevel(conf.loglevel_arg);
298 return;
299 err:
300 free(config_file);
301 exit(EXIT_FAILURE);
302 }
303
304 static void setup_signal_handling(void)
305 {
306 sig_task->fd = para_signal_init();
307 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
308 para_install_sighandler(SIGINT);
309 para_install_sighandler(SIGTERM);
310 para_install_sighandler(SIGHUP);
311 para_sigaction(SIGPIPE, SIG_IGN);
312 }
313
314 static void clear_slot(int slot_num)
315 {
316 struct slot_info *s = &slot[slot_num];
317
318 PARA_INFO_LOG("clearing slot %d\n", slot_num);
319 memset(s, 0, sizeof(struct slot_info));
320 s->format = -1;
321 }
322
323 static void close_receiver(int slot_num)
324 {
325 struct slot_info *s = &slot[slot_num];
326 struct audio_format_info *a;
327 struct timeval restart_delay = {0, 200 * 1000};
328
329 if (s->format < 0 || !s->receiver_node)
330 return;
331 a = &afi[s->format];
332 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
333 audio_formats[s->format], slot_num);
334 a->receiver->close(s->receiver_node);
335 btr_free_node(s->receiver_node->btrn);
336 free(s->receiver_node);
337 s->receiver_node = NULL;
338 tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
339 }
340
341 static void writer_cleanup(struct writer_node *wn)
342 {
343 struct writer *w;
344
345 if (!wn)
346 return;
347 w = writers + wn->writer_num;
348 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
349 w->close(wn);
350 btr_free_node(wn->btrn);
351 }
352
353 static void close_writers(struct slot_info *s)
354 {
355 struct audio_format_info *a;
356 int i;
357
358 if (s->format < 0)
359 return;
360 a = afi + s->format;
361 if (a->num_writers == 0)
362 writer_cleanup(s->wns);
363 else {
364 for (i = 0; i < a->num_writers; i++)
365 writer_cleanup(s->wns + i);
366 }
367 free(s->wns);
368 s->wns = NULL;
369 }
370
371 static void close_filters(struct slot_info *s)
372 {
373 int i;
374 struct audio_format_info *a = afi + s->format;
375 if (a->num_filters == 0)
376 return;
377 for (i = 0; i < a->num_filters; i++) {
378 struct filter_node *fn = s->fns + i;
379 struct filter *f;
380
381 if (!fn)
382 continue;
383 f = filters + fn->filter_num;
384 if (f->close)
385 f->close(fn);
386 btr_free_node(fn->btrn);
387 }
388 free(s->fns);
389 s->fns = NULL;
390 }
391
392 /*
393 * Whenever a task commits suicide by returning from post_select with t->error
394 * < 0, it also removes its btr node. We do exactly that to kill a running
395 * task. Note that the scheduler checks t->error also _before_ each pre/post
396 * select call, so the victim will never be scheduled again.
397 */
398 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
399 {
400 if (t->error < 0)
401 return;
402 t->error = error;
403 btr_remove_node(btrn);
404 }
405
406 static void kill_all_decoders(int error)
407 {
408 int i, j;
409
410 FOR_EACH_SLOT(i) {
411 struct slot_info *s = &slot[i];
412 struct audio_format_info *a;
413 if (s->format < 0)
414 continue;
415 a = afi + s->format;
416 if (s->wns)
417 for (j = 0; j < a->num_writers; j++)
418 kill_btrn(s->wns[j].btrn, &s->wns[j].task, error);
419 if (s->fns)
420 for (j = 0; j < a->num_writers; j++)
421 kill_btrn(s->fns[j].btrn, &s->wns[j].task, error);
422 if (s->receiver_node)
423 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
424 error);
425 }
426 }
427
428 static int get_empty_slot(void)
429 {
430 int i;
431 struct slot_info *s;
432
433 FOR_EACH_SLOT(i) {
434 s = &slot[i];
435 if (s->format < 0) {
436 clear_slot(i);
437 return i;
438 }
439 if (s->wns || s->receiver_node || s->fns)
440 continue;
441 clear_slot(i);
442 return i;
443 }
444 return -E_NO_MORE_SLOTS;
445 }
446
447 /**
448 * get the number of filters
449 *
450 * \param audio_format_num the number identifying the audio format
451 *
452 * \return the number of filters for the given audio format
453 *
454 * \sa struct filter;
455 */
456 int num_filters(int audio_format_num)
457 {
458 return afi[audio_format_num].num_filters;
459 }
460
461 static void open_filters(struct slot_info *s)
462 {
463 struct audio_format_info *a = afi + s->format;
464 struct filter_node *fn;
465 int nf = a->num_filters;
466 struct btr_node *parent;
467 int i;
468
469 if (nf == 0)
470 return;
471 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
472 assert(s->fns == NULL);
473 s->fns = para_calloc(nf * sizeof(struct filter_node));
474 parent = s->receiver_node->btrn;
475 for (i = 0; i < nf; i++) {
476 struct filter *f = filters + a->filter_nums[i];
477 fn = s->fns + i;
478 fn->filter_num = a->filter_nums[i];
479 fn->conf = a->filter_conf[i];
480 fn->task.pre_select = f->pre_select;
481 fn->task.post_select = f->post_select;
482
483 fn->btrn = btr_new_node(&(struct btr_node_description)
484 EMBRACE(.name = f->name, .parent = parent,
485 .handler = f->execute, .context = fn));
486
487 f->open(fn);
488 register_task(&fn->task);
489 parent = fn->btrn;
490 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
491 audio_formats[s->format], i, nf, f->name, s - slot);
492 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
493 }
494 }
495
496 static void open_writers(struct slot_info *s)
497 {
498 int i;
499 struct audio_format_info *a = afi + s->format;
500 struct writer_node *wn;
501 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
502
503 assert(s->wns == NULL);
504 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
505 * sizeof(struct writer_node));
506 if (a->num_writers == 0)
507 setup_writer_node(NULL, parent, s->wns);
508 else {
509 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
510 for (i = 0; i < a->num_writers; i++) {
511 wn = s->wns + i;
512 wn->conf = a->writer_conf[i];
513 wn->writer_num = a->writer_nums[i];
514 register_writer_node(wn, parent);
515 }
516 }
517 }
518
519 /* returns slot num on success */
520 static int open_receiver(int format)
521 {
522 struct audio_format_info *a = &afi[format];
523 struct slot_info *s;
524 int ret, slot_num;
525 struct receiver *r = a->receiver;
526 struct receiver_node *rn;
527 const struct timeval restart_delay = {2, 0};
528
529 ret = get_empty_slot();
530 if (ret < 0)
531 goto err;
532 slot_num = ret;
533 s = &slot[slot_num];
534 s->format = format;
535 s->receiver_node = para_calloc(sizeof(struct receiver_node));
536 rn = s->receiver_node;
537 rn->receiver = r;
538 rn->conf = a->receiver_conf;
539 rn->btrn = btr_new_node(&(struct btr_node_description)
540 EMBRACE(.name = r->name, .context = rn));
541 ret = r->open(rn);
542 if (ret < 0) {
543 btr_free_node(rn->btrn);
544 free(rn);
545 s->receiver_node = NULL;
546 goto err;
547 }
548 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
549 audio_formats[s->format], r->name, slot_num);
550 rn->task.pre_select = r->pre_select;
551 rn->task.post_select = r->post_select;
552 sprintf(rn->task.status, "%s receiver node", r->name);
553 register_task(&rn->task);
554 ret = slot_num;
555 err:
556 if (ret < 0)
557 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
558 tv_add(now, &restart_delay, &afi[format].restart_barrier);
559 return ret;
560 }
561
562 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
563 static int receiver_running(int format)
564 {
565 int i, ret = 0;
566
567 FOR_EACH_SLOT(i) {
568 struct slot_info *s = &slot[i];
569 if (s->format != format)
570 continue;
571 if (!s->receiver_node)
572 continue;
573 if (s->receiver_node->task.error >= 0)
574 return 1;
575 ret = -1;
576 }
577 return ret;
578 }
579
580 struct btr_node *audiod_get_btr_root(void)
581 {
582 int i, newest_slot = -1;
583 struct timeval newest_rstime = {0, 0};
584
585 FOR_EACH_SLOT(i) {
586 struct slot_info *s = &slot[i];
587 struct timeval rstime;
588 if (!s->receiver_node)
589 continue;
590 if (s->receiver_node->task.error < 0)
591 continue;
592 btr_get_node_start(s->receiver_node->btrn, &rstime);
593 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
594 continue;
595 newest_rstime = rstime;
596 newest_slot = i;
597 }
598 if (newest_slot == -1)
599 return NULL;
600 return slot[newest_slot].receiver_node->btrn;
601 }
602
603 /* returns slot num on success. */
604 static int open_current_receiver(struct sched *s)
605 {
606 struct timeval diff;
607 int ret, cafn = stat_task->current_audio_format_num;
608
609 if (cafn < 0 || !stat_task->ct)
610 return -1;
611 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
612 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
613 return -1;
614 ret = receiver_running(cafn);
615 if (ret > 0) /* already running and not eof */
616 return -1;
617 if (ret < 0) { /* eof */
618 /*
619 * para_server uses a zero start time during the announcement
620 * period, i.e. before it sends the first chunk. Wait until
621 * this period begins to avoid restarting the receiver that
622 * belongs to the file just completed.
623 */
624 if (stat_task->server_stream_start.tv_sec != 0) {
625 sched_request_timeout_ms(100, s);
626 return -1;
627 }
628 }
629 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
630 if (tv_diff(&s->timeout, &diff, NULL) > 0)
631 sched_request_timeout(&diff, s);
632 else
633 sched_min_delay(s);
634 return -1;
635 }
636 /* start a new receiver */
637 return open_receiver(cafn);
638 }
639
640 static unsigned compute_time_diff(const struct timeval *status_time)
641 {
642 struct timeval tmp, diff;
643 static unsigned count;
644 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
645 const struct timeval max_deviation = {0, 500 * 1000};
646 const int time_smooth = 5;
647
648 if (!status_time)
649 return count;
650 sign = tv_diff(status_time, now, &diff);
651 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
652 // sign, sa_time_diff_sign);
653 if (!count) {
654 sa_time_diff_sign = sign;
655 stat_task->sa_time_diff = diff;
656 count++;
657 goto out;
658 }
659 if (count > 5) {
660 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
661 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
662 PARA_WARNING_LOG("time diff jump: %lims\n",
663 s * tv2ms(&tmp));
664 }
665 count++;
666 sa_time_diff_sign = tv_convex_combination(
667 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
668 count > 10? sign : sign * time_smooth, &diff,
669 &tmp);
670 stat_task->sa_time_diff = tmp;
671 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
672 sign > 0? "+" : "-",
673 tv2ms(&diff),
674 sa_time_diff_sign ? "+" : "-",
675 tv2ms(&stat_task->sa_time_diff)
676 );
677 out:
678 stat_task->sa_time_diff_sign = sa_time_diff_sign;
679 return count;
680 }
681
682 static int update_item(int itemnum, char *buf)
683 {
684 long unsigned sec, usec;
685
686 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
687 return 1;
688 free(stat_item_values[itemnum]);
689 stat_item_values[itemnum] = para_strdup(buf);
690 stat_client_write_item(itemnum);
691 switch (itemnum) {
692 case SI_STATUS_FLAGS:
693 stat_task->vss_status = 0;
694 if (strchr(buf, 'N'))
695 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
696 if (strchr(buf, 'P'))
697 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
698 break;
699 case SI_OFFSET:
700 stat_task->offset_seconds = atoi(buf);
701 break;
702 case SI_SECONDS_TOTAL:
703 stat_task->length_seconds = atoi(buf);
704 break;
705 case SI_STREAM_START:
706 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
707 struct timeval a_start, delay;
708 delay.tv_sec = conf.stream_delay_arg / 1000;
709 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
710 stat_task->server_stream_start.tv_sec = sec;
711 stat_task->server_stream_start.tv_usec = usec;
712 if (compute_time_diff(NULL) > 2) {
713 if (stat_task->sa_time_diff_sign < 0)
714 tv_add(&stat_task->server_stream_start,
715 &stat_task->sa_time_diff, &a_start);
716 else
717 tv_diff(&stat_task->server_stream_start,
718 &stat_task->sa_time_diff, &a_start);
719 tv_add(&a_start, &delay, &initial_delay_barrier);
720 }
721 }
722 break;
723 case SI_CURRENT_TIME:
724 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
725 struct timeval tv = {sec, usec};
726 compute_time_diff(&tv);
727 }
728 break;
729 case SI_FORMAT:
730 stat_task->current_audio_format_num
731 = get_audio_format_num(buf);
732 }
733 return 1;
734 }
735
736 static int parse_stream_command(const char *txt, char **cmd)
737 {
738 char *p = strchr(txt, ':');
739 int i;
740
741 if (!p)
742 return -E_MISSING_COLON;
743 p++;
744 FOR_EACH_AUDIO_FORMAT(i) {
745 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
746 continue;
747 *cmd = p;
748 return i;
749 }
750 return -E_UNSUPPORTED_AUDIO_FORMAT;
751 }
752
753 static int add_filter(int format, char *cmdline)
754 {
755 struct audio_format_info *a = &afi[format];
756 int filter_num, nf = a->num_filters;
757
758 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
759 if (filter_num < 0)
760 return filter_num;
761 a->filter_nums[nf] = filter_num;
762 a->num_filters++;
763 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
764 filters[filter_num].name);
765 return filter_num;
766 }
767
768 static int parse_writer_args(void)
769 {
770 int i, ret, nw;
771 char *cmd;
772 struct audio_format_info *a;
773
774 nw = PARA_MAX(1U, conf.writer_given);
775 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
776 FOR_EACH_AUDIO_FORMAT(i) {
777 a = &afi[i];
778 a->writer_conf = para_malloc(nw * sizeof(void *));
779 a->writer_nums = para_malloc(nw * sizeof(int));
780 a->num_writers = 0;
781 }
782 for (i = 0; i < conf.writer_given; i++) {
783 void *wconf;
784 int writer_num;
785 ret = parse_stream_command(conf.writer_arg[i], &cmd);
786 if (ret < 0)
787 goto out;
788 a = &afi[ret];
789 nw = a->num_writers;
790 wconf = check_writer_arg(cmd, &writer_num);
791 if (!wconf) {
792 ret = writer_num;
793 goto out;
794 }
795 a->writer_nums[nw] = writer_num;
796 a->writer_conf[nw] = wconf;
797 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
798 nw, writer_names[writer_num]);
799 a->num_writers++;
800 }
801 ret = 1;
802 out:
803 return ret;
804 }
805
806 static int parse_receiver_args(void)
807 {
808 int i, ret, receiver_num;
809 char *cmd = NULL;
810 struct audio_format_info *a;
811
812 for (i = conf.receiver_given - 1; i >= 0; i--) {
813 char *arg = conf.receiver_arg[i];
814 char *recv_arg = strchr(arg, ':');
815 ret = -E_MISSING_COLON;
816 if (!recv_arg)
817 goto out;
818 *recv_arg = '\0';
819 recv_arg++;
820 ret = get_audio_format_num(arg);
821 if (ret < 0)
822 goto out;
823 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
824 if (!afi[ret].receiver_conf) {
825 ret = -E_RECV_SYNTAX;
826 goto out;
827 }
828 afi[ret].receiver = &receivers[receiver_num];
829 }
830 /* use the first available receiver with no arguments
831 * for those audio formats for which no receiver
832 * was specified
833 */
834 cmd = para_strdup(receivers[0].name);
835 FOR_EACH_AUDIO_FORMAT(i) {
836 a = &afi[i];
837 if (a->receiver_conf)
838 continue;
839 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
840 if (!a->receiver_conf)
841 return -E_RECV_SYNTAX;
842 a->receiver = &receivers[receiver_num];
843 }
844 ret = 1;
845 out:
846 free(cmd);
847 return ret;
848 }
849
850 static int init_default_filters(void)
851 {
852 int i, ret = 1;
853
854 FOR_EACH_AUDIO_FORMAT(i) {
855 struct audio_format_info *a = &afi[i];
856 char *tmp;
857 int j;
858
859 if (a->num_filters)
860 continue; /* no default -- nothing to to */
861 /* add "dec" to audio format name */
862 tmp = make_message("%sdec", audio_formats[i]);
863 for (j = 0; filters[j].name; j++)
864 if (!strcmp(tmp, filters[j].name))
865 break;
866 free(tmp);
867 ret = -E_UNSUPPORTED_FILTER;
868 if (!filters[j].name)
869 goto out;
870 tmp = para_strdup(filters[j].name);
871 ret = add_filter(i, tmp);
872 free(tmp);
873 if (ret < 0)
874 goto out;
875 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
876 filters[j].name);
877 }
878 out:
879 return ret;
880 }
881
882 static int parse_filter_args(void)
883 {
884 int i, ret, nf;
885
886 nf = PARA_MAX(1U, conf.filter_given);
887 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
888 FOR_EACH_AUDIO_FORMAT(i) {
889 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
890 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
891 }
892 if (!conf.no_default_filters_given)
893 return init_default_filters();
894 for (i = 0; i < conf.filter_given; i++) {
895 char *arg = conf.filter_arg[i];
896 char *filter_name = strchr(arg, ':');
897 ret = -E_MISSING_COLON;
898 if (!filter_name)
899 goto out;
900 *filter_name = '\0';
901 filter_name++;
902 ret = get_audio_format_num(arg);
903 if (ret < 0)
904 goto out;
905 ret = add_filter(ret, filter_name);
906 if (ret < 0)
907 goto out;
908 }
909 ret = init_default_filters(); /* use default values for the rest */
910 out:
911 return ret;
912 }
913
914 static int parse_stream_args(void)
915 {
916 int ret;
917
918 ret = parse_receiver_args();
919 if (ret < 0)
920 return ret;
921 ret = parse_filter_args();
922 if (ret < 0)
923 return ret;
924 ret = parse_writer_args();
925 if (ret < 0)
926 return ret;
927 return 1;
928 }
929
930 /* does not unlink socket on errors */
931 static int audiod_get_socket(void)
932 {
933 struct sockaddr_un unix_addr;
934 int ret, fd;
935
936 if (conf.socket_given)
937 socket_name = para_strdup(conf.socket_arg);
938 else {
939 char *hn = para_hostname();
940 socket_name = make_message("/var/paraslash/audiod_socket.%s",
941 hn);
942 free(hn);
943 }
944 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
945 if (conf.force_given)
946 unlink(socket_name);
947 ret = create_local_socket(socket_name, &unix_addr,
948 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
949 if (ret < 0)
950 goto err;
951 fd = ret;
952 if (listen(fd , 5) < 0) {
953 ret = -ERRNO_TO_PARA_ERROR(errno);
954 goto err;
955 }
956 ret = mark_fd_nonblocking(fd);
957 if (ret < 0)
958 goto err;
959 return fd;
960 err:
961 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
962 exit(EXIT_FAILURE);
963 }
964
965 static void signal_pre_select(struct sched *s, struct task *t)
966 {
967 struct signal_task *st = container_of(t, struct signal_task, task);
968 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
969 }
970
971 static void signal_post_select(struct sched *s, struct task *t)
972 {
973 struct signal_task *st = container_of(t, struct signal_task, task);
974
975 if (!FD_ISSET(st->fd, &s->rfds))
976 return;
977
978 st->signum = para_next_signal();
979 switch (st->signum) {
980 case SIGINT:
981 case SIGTERM:
982 case SIGHUP:
983 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
984 clean_exit(EXIT_FAILURE, "caught deadly signal");
985 }
986 }
987
988 static void signal_setup_default(struct signal_task *st)
989 {
990 st->task.pre_select = signal_pre_select;
991 st->task.post_select = signal_post_select;
992 sprintf(st->task.status, "signal task");
993 }
994
995 static void command_pre_select(struct sched *s, struct task *t)
996 {
997 struct command_task *ct = container_of(t, struct command_task, task);
998 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
999 }
1000
1001 static void command_post_select(struct sched *s, struct task *t)
1002 {
1003 int ret;
1004 struct command_task *ct = container_of(t, struct command_task, task);
1005 static struct timeval last_status_dump;
1006 struct timeval tmp, delay = {0, 500 * 1000};
1007
1008 tv_add(&last_status_dump, &delay, &tmp);
1009 if (tv_diff(&tmp, now, NULL) < 0) {
1010 audiod_status_dump();
1011 last_status_dump = *now;
1012 }
1013
1014 if (!FD_ISSET(ct->fd, &s->rfds))
1015 return;
1016 ret = handle_connect(ct->fd);
1017 if (ret < 0)
1018 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1019 }
1020
1021 static void init_command_task(struct command_task *ct)
1022 {
1023 ct->task.pre_select = command_pre_select;
1024 ct->task.post_select = command_post_select;
1025 ct->task.error = 0;
1026 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1027 sprintf(ct->task.status, "command task");
1028 }
1029
1030 static void close_stat_pipe(void)
1031 {
1032 if (!stat_task->ct)
1033 return;
1034 client_close(stat_task->ct);
1035 stat_task->ct = NULL;
1036 clear_and_dump_items();
1037 stat_task->length_seconds = 0;
1038 stat_task->offset_seconds = 0;
1039 stat_task->vss_status = 0;
1040 stat_task->current_audio_format_num = -1;
1041 audiod_status_dump();
1042 }
1043
1044 /**
1045 * close the connection to para_server and exit
1046 *
1047 * \param status the exit status which is passed to exit(3)
1048 * \param msg the log message
1049 *
1050 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1051 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1052 * EXIT_FAILURE.
1053 *
1054 * \sa exit(3)
1055 */
1056 void __noreturn clean_exit(int status, const char *msg)
1057 {
1058 PARA_EMERG_LOG("%s\n", msg);
1059 if (socket_name)
1060 unlink(socket_name);
1061 close_stat_pipe();
1062 exit(status);
1063 }
1064
1065 /* avoid busy loop if server is down */
1066 static void set_stat_task_restart_barrier(unsigned seconds)
1067 {
1068 struct timeval delay = {seconds, 0};
1069 tv_add(now, &delay, &stat_task->restart_barrier);
1070 }
1071
1072 static bool try_to_close_slot(int slot_num)
1073 {
1074 struct slot_info *s = &slot[slot_num];
1075 struct audio_format_info *a = afi + s->format;
1076 int i;
1077
1078 if (s->format < 0)
1079 return false;
1080 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1081 return false;
1082 for (i = 0; i < a->num_filters; i++)
1083 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1084 return false;
1085 if (a->num_writers > 0) {
1086 for (i = 0; i < a->num_writers; i++)
1087 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1088 return false;
1089 } else {
1090 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1091 return false;
1092 }
1093 PARA_INFO_LOG("closing slot %d\n", slot_num);
1094 close_writers(s);
1095 close_filters(s);
1096 close_receiver(slot_num);
1097 clear_slot(slot_num);
1098 return true;
1099 }
1100
1101 /*
1102 * Check if any receivers/filters/writers need to be started and do so if
1103 * necessary.
1104 */
1105 static void start_stop_decoders(struct sched *s)
1106 {
1107 int i, ret;
1108 struct slot_info *sl;
1109 struct audio_format_info *a;
1110
1111 FOR_EACH_SLOT(i)
1112 if (try_to_close_slot(i))
1113 sched_min_delay(s);
1114 if (audiod_status != AUDIOD_ON ||
1115 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1116 return kill_all_decoders(-E_NOT_PLAYING);
1117 ret = open_current_receiver(s);
1118 if (ret < 0)
1119 return;
1120 sl = slot + ret;
1121 a = afi + sl->format;
1122 if (a->num_filters)
1123 open_filters(sl);
1124 open_writers(sl);
1125 activate_grab_clients();
1126 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1127 sched_min_delay(s);
1128 }
1129
1130 /* restart the client task if necessary */
1131 static void status_pre_select(struct sched *s, struct task *t)
1132 {
1133 struct status_task *st = container_of(t, struct status_task, task);
1134
1135 if (audiod_status == AUDIOD_OFF) {
1136 if (!st->ct)
1137 goto out;
1138 if (st->ct->task.error >= 0) {
1139 st->ct->task.error = -E_AUDIOD_OFF;
1140 goto out;
1141 }
1142 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1143 goto out;
1144 close_stat_pipe();
1145 st->clock_diff_count = conf.clock_diff_count_arg;
1146 goto out;
1147 }
1148 if (st->ct) {
1149 int ret;
1150 if (st->ct->task.error < 0) {
1151 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1152 goto out;
1153 close_stat_pipe();
1154 goto out;
1155 }
1156 if (st->ct->status != CL_RECEIVING)
1157 goto out;
1158 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1159 update_item);
1160 if (ret < 0) {
1161 st->ct->task.error = ret;
1162 goto out;
1163 }
1164 if (st->ct->loaded != ret) {
1165 st->last_status_read = *now;
1166 st->ct->loaded = ret;
1167 } else {
1168 struct timeval diff;
1169 tv_diff(now, &st->last_status_read, &diff);
1170 if (diff.tv_sec > 61)
1171 st->ct->task.error = -E_STATUS_TIMEOUT;
1172 }
1173 goto out;
1174 }
1175 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1176 goto out;
1177 if (st->clock_diff_count) { /* get status only one time */
1178 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1179 int argc = 5;
1180 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1181 st->clock_diff_count--;
1182 client_open(argc, argv, &st->ct, NULL);
1183 set_stat_task_restart_barrier(2);
1184 sched_min_delay(s);
1185
1186 } else {
1187 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1188 int argc = 4;
1189 client_open(argc, argv, &st->ct, NULL);
1190 set_stat_task_restart_barrier(5);
1191 sched_min_delay(s);
1192 }
1193 free(stat_item_values[SI_BASENAME]);
1194 stat_item_values[SI_BASENAME] = para_strdup(
1195 "no connection to para_server");
1196 stat_client_write_item(SI_BASENAME);
1197 st->last_status_read = *now;
1198 out:
1199 start_stop_decoders(s);
1200 }
1201
1202 static void init_status_task(struct status_task *st)
1203 {
1204 memset(st, 0, sizeof(struct status_task));
1205 st->task.pre_select = status_pre_select;
1206 st->sa_time_diff_sign = 1;
1207 st->clock_diff_count = conf.clock_diff_count_arg;
1208 st->current_audio_format_num = -1;
1209 sprintf(st->task.status, "status task");
1210 }
1211
1212 static void set_initial_status(void)
1213 {
1214 audiod_status = AUDIOD_ON;
1215 if (!conf.mode_given)
1216 return;
1217 if (!strcmp(conf.mode_arg, "sb")) {
1218 audiod_status = AUDIOD_STANDBY;
1219 return;
1220 }
1221 if (!strcmp(conf.mode_arg, "off")) {
1222 audiod_status = AUDIOD_OFF;
1223 return;
1224 }
1225 if (strcmp(conf.mode_arg, "on"))
1226 PARA_WARNING_LOG("invalid mode\n");
1227 }
1228
1229 __noreturn static void print_help_and_die(void)
1230 {
1231 int d = conf.detailed_help_given;
1232 const char **p = d? audiod_args_info_detailed_help
1233 : audiod_args_info_help;
1234
1235 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1236 AUDIOD_CMDLINE_PARSER_VERSION);
1237 printf_or_die("%s\n\n", audiod_args_info_usage);
1238 for (; *p; p++)
1239 printf_or_die("%s\n", *p);
1240 print_receiver_helps(d);
1241 print_filter_helps(d);
1242 print_writer_helps(d);
1243 exit(0);
1244 }
1245
1246 static void init_colors_or_die(void)
1247 {
1248 int ret, i;
1249
1250 if (!want_colors())
1251 return;
1252 daemon_set_default_log_colors();
1253 daemon_set_flag(DF_COLOR_LOG);
1254 for (i = 0; i < conf.log_color_given; i++) {
1255 ret = daemon_set_log_color(conf.log_color_arg[i]);
1256 if (ret < 0)
1257 exit(EXIT_FAILURE);
1258 }
1259 }
1260
1261 /**
1262 * the main function of para_audiod
1263 *
1264 * \param argc usual argument count
1265 * \param argv usual argument vector
1266 *
1267 * \return EXIT_SUCCESS or EXIT_FAILURE
1268 *
1269 * \sa para_audiod(1)
1270 * */
1271 int main(int argc, char *argv[])
1272 {
1273 int ret, i;
1274 static struct sched s;
1275 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1276 struct audiod_cmdline_parser_params params = {
1277 .override = 0,
1278 .initialize = 1,
1279 .check_required = 0,
1280 .check_ambiguity = 0,
1281 .print_errors = 1
1282 };
1283
1284 valid_fd_012();
1285 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1286 exit(EXIT_FAILURE);
1287 HANDLE_VERSION_FLAG("audiod", conf);
1288 /* init receivers/filters/writers early to make help work */
1289 recv_init();
1290 filter_init();
1291 writer_init();
1292 if (conf.help_given || conf.detailed_help_given)
1293 print_help_and_die();
1294 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1295 parse_config_or_die();
1296 init_colors_or_die();
1297 init_random_seed_or_die();
1298 daemon_set_flag(DF_LOG_TIME);
1299 daemon_set_flag(DF_LOG_HOSTNAME);
1300 daemon_set_flag(DF_LOG_LL);
1301 if (conf.log_timing_given)
1302 daemon_set_flag(DF_LOG_TIMING);
1303 if (conf.logfile_given) {
1304 daemon_set_logfile(conf.logfile_arg);
1305 daemon_open_log_or_die();
1306 }
1307 ret = parse_stream_args();
1308 if (ret < 0) {
1309 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1310 exit(EXIT_FAILURE);
1311 }
1312 log_welcome("para_audiod");
1313 server_uptime(UPTIME_SET);
1314 set_initial_status();
1315 FOR_EACH_SLOT(i)
1316 clear_slot(i);
1317 setup_signal_handling();
1318 signal_setup_default(sig_task);
1319
1320 init_status_task(stat_task);
1321 init_command_task(cmd_task);
1322
1323 if (conf.daemon_given)
1324 daemonize();
1325
1326 register_task(&sig_task->task);
1327 register_task(&cmd_task->task);
1328 register_task(&stat_task->task);
1329 s.default_timeout.tv_sec = 2;
1330 s.default_timeout.tv_usec = 999 * 1000;
1331 ret = schedule(&s);
1332
1333 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1334 return EXIT_FAILURE;
1335 }