6a4c9dbead6c61bbaaedfb484369749404dbe7b5
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2011 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c the paraslash's audio daemon */
8 #include <regex.h>
9 #include <sys/types.h>
10 #include <signal.h>
11 #include <stdbool.h>
12
13 #include "para.h"
14 #include "error.h"
15 #include "crypt.h"
16 #include "audiod.cmdline.h"
17 #include "list.h"
18 #include "sched.h"
19 #include "ggo.h"
20 #include "recv.h"
21 #include "buffer_tree.h"
22 #include "filter.h"
23 #include "grab_client.h"
24 #include "client.cmdline.h"
25 #include "client.h"
26 #include "audiod.h"
27 #include "net.h"
28 #include "daemon.h"
29 #include "string.h"
30 #include "fd.h"
31 #include "write.h"
32 #include "write_common.h"
33 #include "signal.h"
34 #include "version.h"
35
36 /** define the array of error lists needed by para_audiod */
37 INIT_AUDIOD_ERRLISTS;
38 /** define the array containing all supported audio formats */
39 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
40
41 /** Defines how audiod handles one supported audio format. */
42 struct audio_format_info {
43 /** pointer to the receiver for this audio format */
44 struct receiver *receiver;
45 /** the receiver configuration */
46 void *receiver_conf;
47 /** the number of filters that should be activated for this audio format */
48 unsigned int num_filters;
49 /** Array of filter numbers to be activated. */
50 unsigned *filter_nums;
51 /** Pointer to the array of filter configurations. */
52 void **filter_conf;
53 /** the number of filters that should be activated for this audio format */
54 unsigned int num_writers;
55 /** Array of writer numbers to be activated. */
56 int *writer_nums;
57 /** pointer to the array of writer configurations */
58 void **writer_conf;
59 /** do not start receiver/filters/writer before this time */
60 struct timeval restart_barrier;
61 };
62
63 /**
64 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
65 * be associated with a receiver/filter/writer triple. This array holds all
66 * information on the status of these slots.
67 *
68 * \sa struct slot_info
69 * */
70 struct slot_info slot[MAX_STREAM_SLOTS];
71
72 /** The vss status flags audiod is interested in. */
73 enum vss_status_flags {
74 /** Whether the 'N' flag is set. */
75 VSS_STATUS_FLAG_NEXT = 1,
76 /** The 'P' flag is set. */
77 VSS_STATUS_FLAG_PLAYING = 2,
78 };
79
80 /**
81 * The task for obtaining para_server's status (para_client stat).
82 *
83 * \sa struct task, struct sched.
84 */
85 struct status_task {
86 /** The associated task structure of audiod. */
87 struct task task;
88 /** Client data associated with the stat task. */
89 struct client_task *ct;
90 /** Do not restart client command until this time. */
91 struct timeval restart_barrier;
92 /** Last time we received status data from para_server. */
93 struct timeval last_status_read;
94 size_t min_iqs;
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 static 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 configuration 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 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
361 &a->restart_barrier);
362 }
363
364 static void writer_cleanup(struct writer_node *wn)
365 {
366 struct writer *w;
367
368 if (!wn)
369 return;
370 w = writers + wn->writer_num;
371 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
372 w->close(wn);
373 btr_free_node(wn->btrn);
374 }
375
376 static void close_writers(struct slot_info *s)
377 {
378 struct audio_format_info *a;
379 int i;
380
381 if (s->format < 0)
382 return;
383 assert(s->wns);
384 a = afi + s->format;
385 if (a->num_writers == 0)
386 writer_cleanup(s->wns);
387 else {
388 for (i = 0; i < a->num_writers; i++)
389 writer_cleanup(s->wns + i);
390 }
391 free(s->wns);
392 s->wns = NULL;
393 }
394
395 static void close_filters(struct slot_info *s)
396 {
397 int i;
398 struct audio_format_info *a = afi + s->format;
399 if (a->num_filters == 0)
400 return;
401 for (i = 0; i < a->num_filters; i++) {
402 struct filter_node *fn = s->fns + i;
403 struct filter *f;
404
405 if (!fn)
406 continue;
407 f = filters + fn->filter_num;
408 if (f->close)
409 f->close(fn);
410 btr_free_node(fn->btrn);
411 }
412 free(s->fns);
413 s->fns = NULL;
414 }
415
416 /*
417 * Whenever a task commits suicide by returning from post_select with t->error
418 * < 0, it also removes its btr node. We do exactly that to kill a running
419 * task. Note that the scheduler checks t->error also _before_ each pre/post
420 * select call, so the victim will never be scheduled again.
421 */
422 static void kill_btrn(struct btr_node *btrn, struct task *t, int error)
423 {
424 if (t->error < 0)
425 return;
426 t->error = error;
427 btr_remove_node(btrn);
428 }
429
430 static void kill_all_decoders(int error)
431 {
432 int i;
433
434 FOR_EACH_SLOT(i) {
435 struct slot_info *s = slot + i;
436 if (s->format < 0)
437 continue;
438 if (!s->receiver_node)
439 continue;
440 kill_btrn(s->receiver_node->btrn, &s->receiver_node->task,
441 error);
442 }
443 }
444
445 static int get_empty_slot(void)
446 {
447 int i;
448 struct slot_info *s;
449
450 FOR_EACH_SLOT(i) {
451 s = &slot[i];
452 if (s->format < 0) {
453 clear_slot(i);
454 return i;
455 }
456 if (s->wns || s->receiver_node || s->fns)
457 continue;
458 clear_slot(i);
459 return i;
460 }
461 return -E_NO_MORE_SLOTS;
462 }
463
464 static void open_filters(struct slot_info *s)
465 {
466 struct audio_format_info *a = afi + s->format;
467 struct filter_node *fn;
468 int nf = a->num_filters;
469 struct btr_node *parent;
470 int i;
471
472 if (nf == 0)
473 return;
474 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
475 assert(s->fns == NULL);
476 s->fns = para_calloc(nf * sizeof(struct filter_node));
477 parent = s->receiver_node->btrn;
478 for (i = 0; i < nf; i++) {
479 struct filter *f = filters + a->filter_nums[i];
480 fn = s->fns + i;
481 fn->filter_num = a->filter_nums[i];
482 fn->conf = a->filter_conf[i];
483 fn->task.pre_select = f->pre_select;
484 fn->task.post_select = f->post_select;
485
486 fn->btrn = btr_new_node(&(struct btr_node_description)
487 EMBRACE(.name = f->name, .parent = parent,
488 .handler = f->execute, .context = fn));
489
490 f->open(fn);
491 register_task(&fn->task);
492 parent = fn->btrn;
493 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
494 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
495 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
496 }
497 }
498
499 static void open_writers(struct slot_info *s)
500 {
501 int i;
502 struct audio_format_info *a = afi + s->format;
503 struct writer_node *wn;
504 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
505
506 assert(s->wns == NULL);
507 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
508 * sizeof(struct writer_node));
509 if (a->num_writers == 0)
510 setup_writer_node(NULL, parent, s->wns);
511 else {
512 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
513 for (i = 0; i < a->num_writers; i++) {
514 wn = s->wns + i;
515 wn->conf = a->writer_conf[i];
516 wn->writer_num = a->writer_nums[i];
517 register_writer_node(wn, parent);
518 }
519 }
520 }
521
522 /* returns slot num on success */
523 static int open_receiver(int format)
524 {
525 struct audio_format_info *a = &afi[format];
526 struct slot_info *s;
527 int ret, slot_num;
528 struct receiver *r = a->receiver;
529 struct receiver_node *rn;
530
531 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
532 ret = get_empty_slot();
533 if (ret < 0)
534 return ret;
535 slot_num = ret;
536 rn = para_calloc(sizeof(*rn));
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 return ret;
546 }
547 s = &slot[slot_num];
548 s->format = format;
549 s->receiver_node = rn;
550 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
551 audio_formats[format], r->name, slot_num);
552 rn->task.pre_select = r->pre_select;
553 rn->task.post_select = r->post_select;
554 sprintf(rn->task.status, "%s receiver node", r->name);
555 register_task(&rn->task);
556 return slot_num;
557 }
558
559 static bool receiver_running(void)
560 {
561 int i;
562 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
563
564 FOR_EACH_SLOT(i) {
565 struct slot_info *s = &slot[i];
566 long unsigned ss2 = s->server_stream_start.tv_sec;
567
568 if (!s->receiver_node)
569 continue;
570 if (s->receiver_node->task.error >= 0)
571 return true;
572 if (ss1 == ss2)
573 return true;
574 }
575 return false;
576 }
577
578 /**
579 * Return the root node of the current buffer tree.
580 *
581 * This is only used for stream grabbing.
582 *
583 * \return \p NULL if no slot is currently active. If more than one buffer tree
584 * exists, the node corresponding to the most recently started receiver is
585 * returned.
586 */
587 struct btr_node *audiod_get_btr_root(void)
588 {
589 int i, newest_slot = -1;
590 struct timeval newest_rstime = {0, 0};
591
592 FOR_EACH_SLOT(i) {
593 struct slot_info *s = &slot[i];
594 struct timeval rstime;
595 if (!s->receiver_node)
596 continue;
597 if (s->receiver_node->task.error < 0)
598 continue;
599 btr_get_node_start(s->receiver_node->btrn, &rstime);
600 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
601 continue;
602 newest_rstime = rstime;
603 newest_slot = i;
604 }
605 if (newest_slot == -1)
606 return NULL;
607 return slot[newest_slot].receiver_node->btrn;
608 }
609
610 /* whether a new instance of a decoder should be started. */
611 static bool must_start_decoder(void)
612 {
613 int cafn = stat_task->current_audio_format_num;
614 unsigned vs = stat_task->vss_status;
615
616 if (audiod_status != AUDIOD_ON)
617 return false;
618 if (cafn < 0)
619 return false;
620 if (!stat_task->ct)
621 return false;
622 if (vs & VSS_STATUS_FLAG_NEXT)
623 return false;
624 if (!(vs & VSS_STATUS_FLAG_PLAYING))
625 return false;
626 if (receiver_running())
627 return false;
628 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
629 return false;
630 return true;
631 }
632
633 static unsigned compute_time_diff(const struct timeval *status_time)
634 {
635 struct timeval tmp, diff;
636 static unsigned count;
637 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
638 const struct timeval max_deviation = {0, 500 * 1000};
639 const int time_smooth = 5;
640
641 if (!status_time)
642 return count;
643 sign = tv_diff(status_time, now, &diff);
644 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
645 // sign, sa_time_diff_sign);
646 if (!count) {
647 sa_time_diff_sign = sign;
648 stat_task->sa_time_diff = diff;
649 count++;
650 goto out;
651 }
652 if (count > 5) {
653 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
654 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
655 PARA_WARNING_LOG("time diff jump: %lims\n",
656 s * tv2ms(&tmp));
657 }
658 count++;
659 sa_time_diff_sign = tv_convex_combination(
660 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
661 count > 10? sign : sign * time_smooth, &diff,
662 &tmp);
663 stat_task->sa_time_diff = tmp;
664 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
665 sign < 0? "-" : "+",
666 tv2ms(&diff),
667 sa_time_diff_sign < 0? "-" : "+",
668 tv2ms(&stat_task->sa_time_diff)
669 );
670 out:
671 stat_task->sa_time_diff_sign = sa_time_diff_sign;
672 return count;
673 }
674
675 static int update_item(int itemnum, char *buf)
676 {
677 long unsigned sec, usec;
678
679 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
680 return 1;
681 free(stat_item_values[itemnum]);
682 stat_item_values[itemnum] = para_strdup(buf);
683 stat_client_write_item(itemnum);
684 switch (itemnum) {
685 case SI_STATUS_FLAGS:
686 stat_task->vss_status = 0;
687 if (strchr(buf, 'N'))
688 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
689 if (strchr(buf, 'P'))
690 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
691 break;
692 case SI_OFFSET:
693 stat_task->offset_seconds = atoi(buf);
694 break;
695 case SI_SECONDS_TOTAL:
696 stat_task->length_seconds = atoi(buf);
697 break;
698 case SI_STREAM_START:
699 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
700 stat_task->server_stream_start.tv_sec = sec;
701 stat_task->server_stream_start.tv_usec = usec;
702 }
703 break;
704 case SI_CURRENT_TIME:
705 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
706 struct timeval tv = {sec, usec};
707 compute_time_diff(&tv);
708 }
709 break;
710 case SI_FORMAT:
711 stat_task->current_audio_format_num
712 = get_audio_format_num(buf);
713 }
714 return 1;
715 }
716
717 static int parse_stream_command(const char *txt, char **cmd)
718 {
719 char *p = strchr(txt, ':');
720 int i;
721
722 if (!p)
723 return -E_MISSING_COLON;
724 p++;
725 FOR_EACH_AUDIO_FORMAT(i) {
726 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
727 continue;
728 *cmd = p;
729 return i;
730 }
731 return -E_UNSUPPORTED_AUDIO_FORMAT;
732 }
733
734 static int add_filter(int format, char *cmdline)
735 {
736 struct audio_format_info *a = &afi[format];
737 int filter_num, nf = a->num_filters;
738
739 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
740 if (filter_num < 0)
741 return filter_num;
742 a->filter_nums[nf] = filter_num;
743 a->num_filters++;
744 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
745 filters[filter_num].name);
746 return filter_num;
747 }
748
749 static int parse_writer_args(void)
750 {
751 int i, ret, nw;
752 char *cmd;
753 struct audio_format_info *a;
754
755 nw = PARA_MAX(1U, conf.writer_given);
756 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
757 FOR_EACH_AUDIO_FORMAT(i) {
758 a = &afi[i];
759 a->writer_conf = para_malloc(nw * sizeof(void *));
760 a->writer_nums = para_malloc(nw * sizeof(int));
761 a->num_writers = 0;
762 }
763 for (i = 0; i < conf.writer_given; i++) {
764 void *wconf;
765 int writer_num;
766 ret = parse_stream_command(conf.writer_arg[i], &cmd);
767 if (ret < 0)
768 goto out;
769 a = &afi[ret];
770 nw = a->num_writers;
771 wconf = check_writer_arg(cmd, &writer_num);
772 if (!wconf) {
773 ret = writer_num;
774 goto out;
775 }
776 a->writer_nums[nw] = writer_num;
777 a->writer_conf[nw] = wconf;
778 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
779 nw, writer_names[writer_num]);
780 a->num_writers++;
781 }
782 ret = 1;
783 out:
784 return ret;
785 }
786
787 static int parse_receiver_args(void)
788 {
789 int i, ret, receiver_num;
790 char *cmd = NULL;
791 struct audio_format_info *a;
792
793 for (i = conf.receiver_given - 1; i >= 0; i--) {
794 char *arg = conf.receiver_arg[i];
795 char *recv_arg = strchr(arg, ':');
796 ret = -E_MISSING_COLON;
797 if (!recv_arg)
798 goto out;
799 *recv_arg = '\0';
800 recv_arg++;
801 ret = get_audio_format_num(arg);
802 if (ret < 0)
803 goto out;
804 /*
805 * If multiple receivers are given for this audio format, the
806 * last one wins and we have to free the previous receiver
807 * config here. Since we are iterating backwards, the winning
808 * receiver arg is in fact the first one given.
809 */
810 if (afi[ret].receiver_conf)
811 afi[ret].receiver->free_config(afi[ret].receiver_conf);
812 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
813 if (!afi[ret].receiver_conf) {
814 ret = -E_RECV_SYNTAX;
815 goto out;
816 }
817 afi[ret].receiver = &receivers[receiver_num];
818 }
819 /*
820 * Use the first available receiver with no arguments for those audio
821 * formats for which no receiver was specified.
822 */
823 cmd = para_strdup(receivers[0].name);
824 FOR_EACH_AUDIO_FORMAT(i) {
825 a = &afi[i];
826 if (a->receiver_conf)
827 continue;
828 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
829 if (!a->receiver_conf)
830 return -E_RECV_SYNTAX;
831 a->receiver = &receivers[receiver_num];
832 }
833 ret = 1;
834 out:
835 free(cmd);
836 return ret;
837 }
838
839 static int init_default_filters(void)
840 {
841 int i, ret = 1;
842
843 FOR_EACH_AUDIO_FORMAT(i) {
844 struct audio_format_info *a = &afi[i];
845 char *tmp;
846 int j;
847
848 if (a->num_filters)
849 continue; /* no default -- nothing to to */
850 /*
851 * If udp is used to receive this audiod format, add fecdec as
852 * the first filter.
853 */
854 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
855 strcmp(afi[i].receiver->name, "dccp") == 0) {
856 tmp = para_strdup("fecdec");
857 add_filter(i, tmp);
858 free(tmp);
859 if (ret < 0)
860 goto out;
861 }
862 /* add "dec" to audio format name */
863 tmp = make_message("%sdec", audio_formats[i]);
864 for (j = 0; filters[j].name; j++)
865 if (!strcmp(tmp, filters[j].name))
866 break;
867 free(tmp);
868 ret = -E_UNSUPPORTED_FILTER;
869 if (!filters[j].name)
870 goto out;
871 tmp = para_strdup(filters[j].name);
872 ret = add_filter(i, tmp);
873 free(tmp);
874 if (ret < 0)
875 goto out;
876 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
877 filters[j].name);
878 }
879 out:
880 return ret;
881 }
882
883 static int parse_filter_args(void)
884 {
885 int i, ret, nf;
886
887 nf = PARA_MAX(2U, conf.filter_given);
888 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
889 FOR_EACH_AUDIO_FORMAT(i) {
890 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
891 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
892 }
893 if (!conf.no_default_filters_given)
894 return init_default_filters();
895 for (i = 0; i < conf.filter_given; i++) {
896 char *arg = conf.filter_arg[i];
897 char *filter_name = strchr(arg, ':');
898 ret = -E_MISSING_COLON;
899 if (!filter_name)
900 goto out;
901 *filter_name = '\0';
902 filter_name++;
903 ret = get_audio_format_num(arg);
904 if (ret < 0)
905 goto out;
906 ret = add_filter(ret, filter_name);
907 if (ret < 0)
908 goto out;
909 }
910 ret = init_default_filters(); /* use default values for the rest */
911 out:
912 return ret;
913 }
914
915 static int parse_stream_args(void)
916 {
917 int ret;
918
919 ret = parse_receiver_args();
920 if (ret < 0)
921 return ret;
922 ret = parse_filter_args();
923 if (ret < 0)
924 return ret;
925 ret = parse_writer_args();
926 if (ret < 0)
927 return ret;
928 return 1;
929 }
930
931 /* does not unlink socket on errors */
932 static int audiod_get_socket(void)
933 {
934 struct sockaddr_un unix_addr;
935 int ret, fd;
936
937 if (conf.socket_given)
938 socket_name = para_strdup(conf.socket_arg);
939 else {
940 char *hn = para_hostname();
941 socket_name = make_message("/var/paraslash/audiod_socket.%s",
942 hn);
943 free(hn);
944 }
945 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
946 if (conf.force_given)
947 unlink(socket_name);
948 ret = create_local_socket(socket_name, &unix_addr,
949 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
950 if (ret < 0)
951 goto err;
952 fd = ret;
953 if (listen(fd , 5) < 0) {
954 ret = -ERRNO_TO_PARA_ERROR(errno);
955 goto err;
956 }
957 ret = mark_fd_nonblocking(fd);
958 if (ret < 0)
959 goto err;
960 return fd;
961 err:
962 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
963 exit(EXIT_FAILURE);
964 }
965
966 static void signal_pre_select(struct sched *s, struct task *t)
967 {
968 struct signal_task *st = container_of(t, struct signal_task, task);
969 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
970 }
971
972 static void signal_post_select(struct sched *s, __a_unused struct task *t)
973 {
974 int signum;
975
976 signum = para_next_signal(&s->rfds);
977 switch (signum) {
978 case SIGINT:
979 case SIGTERM:
980 case SIGHUP:
981 PARA_EMERG_LOG("terminating on signal %d\n", signum);
982 clean_exit(EXIT_FAILURE, "caught deadly signal");
983 }
984 }
985
986 static void signal_setup_default(struct signal_task *st)
987 {
988 st->task.pre_select = signal_pre_select;
989 st->task.post_select = signal_post_select;
990 sprintf(st->task.status, "signal task");
991 }
992
993 static void command_pre_select(struct sched *s, struct task *t)
994 {
995 struct command_task *ct = container_of(t, struct command_task, task);
996 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
997 }
998
999 static void command_post_select(struct sched *s, struct task *t)
1000 {
1001 int ret;
1002 struct command_task *ct = container_of(t, struct command_task, task);
1003 static struct timeval last_status_dump;
1004 struct timeval tmp, delay = {0, 500 * 1000};
1005
1006 tv_add(&last_status_dump, &delay, &tmp);
1007 if (tv_diff(&tmp, now, NULL) < 0) {
1008 audiod_status_dump();
1009 last_status_dump = *now;
1010 }
1011
1012 ret = handle_connect(ct->fd, &s->rfds);
1013 if (ret < 0)
1014 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1015 audiod_status_dump();
1016 }
1017
1018 static void init_command_task(struct command_task *ct)
1019 {
1020 ct->task.pre_select = command_pre_select;
1021 ct->task.post_select = command_post_select;
1022 ct->task.error = 0;
1023 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1024 sprintf(ct->task.status, "command task");
1025 }
1026
1027 static void close_stat_pipe(void)
1028 {
1029 if (!stat_task->ct)
1030 return;
1031 btr_free_node(stat_task->ct->btrn);
1032 client_close(stat_task->ct);
1033 stat_task->ct = NULL;
1034 clear_and_dump_items();
1035 stat_task->length_seconds = 0;
1036 stat_task->offset_seconds = 0;
1037 stat_task->vss_status = 0;
1038 stat_task->current_audio_format_num = -1;
1039 audiod_status_dump();
1040 }
1041
1042 /**
1043 * close the connection to para_server and exit
1044 *
1045 * \param status the exit status which is passed to exit(3)
1046 * \param msg the log message
1047 *
1048 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1049 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1050 * EXIT_FAILURE.
1051 *
1052 * \sa exit(3)
1053 */
1054 void __noreturn clean_exit(int status, const char *msg)
1055 {
1056 PARA_EMERG_LOG("%s\n", msg);
1057 if (socket_name)
1058 unlink(socket_name);
1059 close_stat_pipe();
1060 exit(status);
1061 }
1062
1063 /* avoid busy loop if server is down */
1064 static void set_stat_task_restart_barrier(unsigned seconds)
1065 {
1066 struct timeval delay = {seconds, 0};
1067 tv_add(now, &delay, &stat_task->restart_barrier);
1068 }
1069
1070 static void try_to_close_slot(int slot_num)
1071 {
1072 struct slot_info *s = &slot[slot_num];
1073 struct audio_format_info *a = afi + s->format;
1074 int i;
1075
1076 if (s->format < 0)
1077 return;
1078 if (s->receiver_node && s->receiver_node->task.error >= 0)
1079 return;
1080 for (i = 0; i < a->num_filters; i++)
1081 if (s->fns && s->fns[i].task.error >= 0)
1082 return;
1083 if (a->num_writers > 0) {
1084 for (i = 0; i < a->num_writers; i++)
1085 if (s->wns && s->wns[i].task.error >= 0)
1086 return;
1087 } else {
1088 if (s->wns && s->wns[0].task.error >= 0)
1089 return;
1090 }
1091 PARA_INFO_LOG("closing slot %d\n", slot_num);
1092 close_writers(s);
1093 close_filters(s);
1094 close_receiver(slot_num);
1095 clear_slot(slot_num);
1096 }
1097
1098 /*
1099 * Check if any receivers/filters/writers need to be started and do so if
1100 * necessary.
1101 */
1102 static void start_stop_decoders(void)
1103 {
1104 int i, ret;
1105 struct slot_info *sl;
1106 struct audio_format_info *a;
1107
1108 FOR_EACH_SLOT(i)
1109 try_to_close_slot(i);
1110 if (audiod_status != AUDIOD_ON ||
1111 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1112 return kill_all_decoders(-E_NOT_PLAYING);
1113 if (!must_start_decoder())
1114 return;
1115 ret = open_receiver(stat_task->current_audio_format_num);
1116 if (ret < 0) {
1117 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1118 return;
1119 }
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 }
1128
1129 static void status_pre_select(struct sched *s, struct task *t)
1130 {
1131 struct status_task *st = container_of(t, struct status_task, task);
1132 int ret, cafn = stat_task->current_audio_format_num;
1133
1134 if (must_start_decoder())
1135 goto min_delay;
1136 ret = btr_node_status(st->btrn, 0, BTR_NT_LEAF);
1137 if (ret > 0)
1138 goto min_delay;
1139 if (st->ct && audiod_status == AUDIOD_OFF)
1140 goto min_delay;
1141 if (!st->ct && audiod_status != AUDIOD_OFF)
1142 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1143 if (cafn >= 0)
1144 sched_request_barrier(&afi[cafn].restart_barrier, s);
1145 /*
1146 * If para_server is playing we'd like to have a smooth time display
1147 * even if we are running in standby mode. So we request a timeout that
1148 * expires at the next full second.
1149 */
1150 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1151 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1152 return;
1153 min_delay:
1154 sched_min_delay(s);
1155 }
1156
1157 /* restart the client task if necessary */
1158 static void status_post_select(__a_unused struct sched *s, struct task *t)
1159 {
1160 struct status_task *st = container_of(t, struct status_task, task);
1161
1162 if (audiod_status == AUDIOD_OFF) {
1163 if (!st->ct)
1164 goto out;
1165 if (st->ct->task.error >= 0) {
1166 kill_btrn(st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1167 goto out;
1168 }
1169 if (st->ct->task.error >= 0)
1170 goto out;
1171 close_stat_pipe();
1172 st->clock_diff_count = conf.clock_diff_count_arg;
1173 goto out;
1174 }
1175 if (st->ct) {
1176 char *buf;
1177 size_t sz;
1178 int ret;
1179 if (st->ct->task.error < 0) {
1180 if (st->ct->task.error >= 0)
1181 goto out;
1182 close_stat_pipe();
1183 goto out;
1184 }
1185 if (st->ct->status != CL_RECEIVING)
1186 goto out;
1187 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1188 if (ret <= 0) {
1189 struct timeval diff;
1190 tv_diff(now, &st->last_status_read, &diff);
1191 if (diff.tv_sec > 61)
1192 kill_btrn(st->ct->btrn, &st->ct->task,
1193 -E_STATUS_TIMEOUT);
1194 goto out;
1195 }
1196 btr_merge(st->btrn, st->min_iqs);
1197 sz = btr_next_buffer(st->btrn, &buf);
1198 ret = for_each_stat_item(buf, sz, update_item);
1199 if (ret < 0) {
1200 kill_btrn(st->ct->btrn, &st->ct->task, ret);
1201 goto out;
1202 }
1203 if (sz != ret) {
1204 btr_consume(st->btrn, sz - ret);
1205 st->last_status_read = *now;
1206 st->min_iqs = 0;
1207 } else /* current status item crosses buffers */
1208 st->min_iqs = sz + 1;
1209 goto out;
1210 }
1211 btr_drain(st->btrn);
1212 st->current_audio_format_num = -1;
1213 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1214 goto out;
1215 if (st->clock_diff_count) { /* get status only one time */
1216 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1217 int argc = 5;
1218 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1219 st->clock_diff_count--;
1220 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1221 set_stat_task_restart_barrier(2);
1222
1223 } else {
1224 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1225 int argc = 4;
1226 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn);
1227 set_stat_task_restart_barrier(5);
1228 }
1229 free(stat_item_values[SI_BASENAME]);
1230 stat_item_values[SI_BASENAME] = para_strdup(
1231 "no connection to para_server");
1232 stat_client_write_item(SI_BASENAME);
1233 st->last_status_read = *now;
1234 out:
1235 start_stop_decoders();
1236 }
1237
1238 static void init_status_task(struct status_task *st)
1239 {
1240 memset(st, 0, sizeof(struct status_task));
1241 st->task.pre_select = status_pre_select;
1242 st->task.post_select = status_post_select;
1243 st->sa_time_diff_sign = 1;
1244 st->clock_diff_count = conf.clock_diff_count_arg;
1245 st->current_audio_format_num = -1;
1246 sprintf(st->task.status, "stat");
1247 st->btrn = btr_new_node(&(struct btr_node_description)
1248 EMBRACE(.name = "stat"));
1249 }
1250
1251 static void set_initial_status(void)
1252 {
1253 audiod_status = AUDIOD_ON;
1254 if (!conf.mode_given)
1255 return;
1256 if (!strcmp(conf.mode_arg, "sb")) {
1257 audiod_status = AUDIOD_STANDBY;
1258 return;
1259 }
1260 if (!strcmp(conf.mode_arg, "off")) {
1261 audiod_status = AUDIOD_OFF;
1262 return;
1263 }
1264 if (strcmp(conf.mode_arg, "on"))
1265 PARA_WARNING_LOG("invalid mode\n");
1266 }
1267
1268 __noreturn static void print_help_and_die(void)
1269 {
1270 int d = conf.detailed_help_given;
1271 const char **p = d? audiod_args_info_detailed_help
1272 : audiod_args_info_help;
1273
1274 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1275 AUDIOD_CMDLINE_PARSER_VERSION);
1276 printf_or_die("%s\n\n", audiod_args_info_usage);
1277 for (; *p; p++)
1278 printf_or_die("%s\n", *p);
1279 print_receiver_helps(d);
1280 print_filter_helps(d);
1281 print_writer_helps(d);
1282 exit(0);
1283 }
1284
1285 static void init_colors_or_die(void)
1286 {
1287 int i;
1288
1289 if (!want_colors())
1290 return;
1291 daemon_set_default_log_colors();
1292 daemon_set_flag(DF_COLOR_LOG);
1293 for (i = 0; i < conf.log_color_given; i++)
1294 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1295 }
1296
1297 /**
1298 * the main function of para_audiod
1299 *
1300 * \param argc usual argument count
1301 * \param argv usual argument vector
1302 *
1303 * \return EXIT_SUCCESS or EXIT_FAILURE
1304 *
1305 * \sa para_audiod(1)
1306 * */
1307 int main(int argc, char *argv[])
1308 {
1309 int ret, i;
1310 static struct sched s;
1311 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1312 struct audiod_cmdline_parser_params params = {
1313 .override = 0,
1314 .initialize = 1,
1315 .check_required = 0,
1316 .check_ambiguity = 0,
1317 .print_errors = 1
1318 };
1319
1320 valid_fd_012();
1321 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1322 exit(EXIT_FAILURE);
1323 HANDLE_VERSION_FLAG("audiod", conf);
1324 /* init receivers/filters/writers early to make help work */
1325 recv_init();
1326 filter_init();
1327 writer_init();
1328 if (conf.help_given || conf.detailed_help_given)
1329 print_help_and_die();
1330 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1331 parse_config_or_die();
1332 init_colors_or_die();
1333 init_random_seed_or_die();
1334 daemon_set_flag(DF_LOG_TIME);
1335 daemon_set_flag(DF_LOG_HOSTNAME);
1336 daemon_set_flag(DF_LOG_LL);
1337 if (conf.log_timing_given)
1338 daemon_set_flag(DF_LOG_TIMING);
1339 if (conf.logfile_given) {
1340 daemon_set_logfile(conf.logfile_arg);
1341 daemon_open_log_or_die();
1342 }
1343 ret = parse_stream_args();
1344 if (ret < 0) {
1345 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1346 exit(EXIT_FAILURE);
1347 }
1348 log_welcome("para_audiod");
1349 server_uptime(UPTIME_SET);
1350 set_initial_status();
1351 FOR_EACH_SLOT(i)
1352 clear_slot(i);
1353 setup_signal_handling();
1354 signal_setup_default(sig_task);
1355
1356 init_status_task(stat_task);
1357 init_command_task(cmd_task);
1358
1359 if (conf.daemon_given)
1360 daemonize();
1361
1362 register_task(&sig_task->task);
1363 register_task(&cmd_task->task);
1364 register_task(&stat_task->task);
1365 s.default_timeout.tv_sec = 2;
1366 s.default_timeout.tv_usec = 999 * 1000;
1367 ret = schedule(&s);
1368
1369 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1370 return EXIT_FAILURE;
1371 }