file writer: Use xwrite() instead of plain write().
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2013 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
12 #include "para.h"
13 #include "error.h"
14 #include "crypt.h"
15 #include "audiod.cmdline.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "buffer_tree.h"
20 #include "recv.h"
21 #include "filter.h"
22 #include "grab_client.h"
23 #include "client.cmdline.h"
24 #include "client.h"
25 #include "audiod.h"
26 #include "net.h"
27 #include "daemon.h"
28 #include "string.h"
29 #include "fd.h"
30 #include "write.h"
31 #include "write_common.h"
32 #include "signal.h"
33 #include "version.h"
34
35 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
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 DEFINE_RECEIVER_ARRAY;
42
43 /** Defines how audiod handles one supported audio format. */
44 struct audio_format_info {
45 /** pointer to the receiver for this audio format */
46 struct receiver *receiver;
47 /** the receiver configuration */
48 void *receiver_conf;
49 /** the number of filters that should be activated for this audio format */
50 unsigned int num_filters;
51 /** Array of filter numbers to be activated. */
52 unsigned *filter_nums;
53 /** Pointer to the array of filter configurations. */
54 void **filter_conf;
55 /** the number of filters that should be activated for this audio format */
56 unsigned int num_writers;
57 /** Array of writer numbers to be activated. */
58 int *writer_nums;
59 /** pointer to the array of writer configurations */
60 void **writer_conf;
61 /** do not start receiver/filters/writer before this time */
62 struct timeval restart_barrier;
63 };
64
65 /**
66 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
67 * be associated with a receiver/filter/writer triple. This array holds all
68 * information on the status of these slots.
69 *
70 * \sa struct slot_info
71 * */
72 struct slot_info slot[MAX_STREAM_SLOTS];
73
74 /** The vss status flags audiod is interested in. */
75 enum vss_status_flags {
76 /** Whether the 'N' flag is set. */
77 VSS_STATUS_FLAG_NEXT = 1,
78 /** The 'P' flag is set. */
79 VSS_STATUS_FLAG_PLAYING = 2,
80 };
81
82 /**
83 * The scheduler instance of para_audiod.
84 *
85 * This is needed also in audiod_command.c (for the tasks command), so it can
86 * not be made static.
87 */
88 struct sched sched = {.max_fileno = 0};
89
90 /**
91 * The task for obtaining para_server's status (para_client stat).
92 *
93 * \sa struct task, struct sched.
94 */
95 struct status_task {
96 /** The associated task structure of audiod. */
97 struct task task;
98 /** Client data associated with the stat task. */
99 struct client_task *ct;
100 /** Do not restart client command until this time. */
101 struct timeval restart_barrier;
102 /** Last time we received status data from para_server. */
103 struct timeval last_status_read;
104 size_t min_iqs;
105 /** The offset value announced by para_server. */
106 int offset_seconds;
107 /** The length of the current audio file as announced by para_server. */
108 int length_seconds;
109 /** The start of the current stream from the view of para_server. */
110 struct timeval server_stream_start;
111 /** The average time deviation between para_server and para_audiod. */
112 struct timeval sa_time_diff;
113 /** Whether client time is ahead of server time. */
114 int sa_time_diff_sign;
115 /** The 'P' and the 'N' flags as announced by para_server. */
116 enum vss_status_flags vss_status;
117 /** Number of times the clock difference is to be checked. */
118 unsigned clock_diff_count;
119 /** When to start the next check for clock difference. */
120 struct timeval clock_diff_barrier;
121 /** Number of the audio format as announced by para_server. */
122 int current_audio_format_num;
123 /* The status task btrn is the child of the client task. */
124 struct btr_node *btrn;
125 };
126
127 /** The array of status items sent by para_server. */
128 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
129
130 /**
131 * the current mode of operation of which can be changed by the on/off/cycle
132 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
133 */
134 int audiod_status = AUDIOD_ON;
135
136 /**
137 * the gengetopt args_info struct that holds information on all command line
138 * arguments
139 */
140 struct audiod_args_info conf;
141
142 static char *socket_name;
143 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
144
145 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
146
147 static struct status_task status_task_struct;
148
149 /**
150 * the task that calls the status command of para_server
151 *
152 * \sa struct status_task
153 */
154 static struct status_task *stat_task = &status_task_struct;
155
156 /**
157 * the task for handling audiod commands
158 *
159 * \sa struct task, struct sched
160 */
161 struct command_task {
162 /** the local listening socket */
163 int fd;
164 /** the associated task structure */
165 struct task task;
166 };
167
168 /** iterate over all supported audio formats */
169 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
170
171 /**
172 * Get the audio format number.
173 *
174 * \param name The name of the audio format.
175 *
176 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
177 * \a name is not a supported audio format.
178 */
179 static int get_audio_format_num(const char *name)
180 {
181 int i;
182
183 while (para_isspace(*name))
184 name++;
185 FOR_EACH_AUDIO_FORMAT(i)
186 if (!strcmp(name, audio_formats[i]))
187 return i;
188 return -E_UNSUPPORTED_AUDIO_FORMAT;
189 }
190
191 static int get_matching_audio_format_nums(const char *re)
192 {
193 int i, ret;
194 regex_t preg;
195
196 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
197 if (ret < 0)
198 return ret;
199 ret = 0;
200 FOR_EACH_AUDIO_FORMAT(i)
201 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
202 ret |= (1 << i);
203 regfree(&preg);
204 return ret;
205 }
206
207 /**
208 * Compute the play time based on information of the given slot.
209 *
210 * \param slot_num The slot number (negative means: no slot).
211 *
212 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
213 * from the status items received from para_server and the start time of the
214 * (first) writer of the given slot.
215 *
216 * It has to to take into account that probably the stream was not started at
217 * the beginning of the file, that the clock between the server and the client
218 * host may differ and that playback of the stream was delayed, e.g. because
219 * the prebuffer filter is used in the filter configuration of the given slot.
220 *
221 * If no writer is active in the given slot, or \a slot_num is negative
222 * (indicating that para_audiod runs in standby mode), an approximation based
223 * only on the status items is computed and the returned string is prefixed
224 * with "~".
225 *
226 * \return A string that must be freed by the caller.
227 */
228 char *get_time_string(int slot_num)
229 {
230 int ret, seconds = 0, length;
231 struct timeval *tmp, sum, sss, /* server stream start */
232 rstime, /* receiver start time */
233 wstime, /* writer start time */
234 wtime, /* now - writer start */
235 rskip; /* receiver start - sss */
236 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
237 char *msg;
238
239 if (audiod_status == AUDIOD_OFF)
240 goto empty;
241 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
242 if (stat_task->length_seconds) /* paused */
243 return NULL;
244 goto empty; /* stopped */
245 }
246 if (audiod_status == AUDIOD_ON && !s)
247 goto empty;
248 /*
249 * Valid status items and playing, set length and tmp to the stream
250 * start. We use the slot info and fall back to the info from current
251 * status items if no slot info is available.
252 */
253 length = stat_task->length_seconds;
254 tmp = &stat_task->server_stream_start;
255 if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
256 btr_get_node_start(s->wns[0].btrn, &wstime);
257 if (wstime.tv_sec != 0) { /* writer wrote something */
258 if (s->server_stream_start.tv_sec == 0) {
259 /* copy status info to slot */
260 s->server_stream_start = stat_task->server_stream_start;
261 s->offset_seconds = stat_task->offset_seconds;
262 s->seconds_total = stat_task->length_seconds;
263 }
264 length = s->seconds_total;
265 tmp = &s->server_stream_start;
266 }
267 }
268 if (stat_task->sa_time_diff_sign > 0)
269 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
270 else
271 tv_add(tmp, &stat_task->sa_time_diff, &sss);
272 if (!s || !s->wns || !s->wns[0].btrn) {
273 struct timeval diff;
274 tv_diff(now, &sss, &diff);
275 seconds = diff.tv_sec + stat_task->offset_seconds;
276 goto out;
277 }
278 tv_diff(now, &wstime, &wtime);
279 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
280 seconds = s->offset_seconds;
281 if (s->receiver_node->btrn) {
282 btr_get_node_start(s->receiver_node->btrn, &rstime);
283 ret = tv_diff(&rstime, &sss, &rskip);
284 if (ret > 0) { /* audiod was started in the middle of the stream */
285 tv_add(&wtime, &rskip, &sum);
286 seconds += sum.tv_sec;
287 } else
288 seconds += wtime.tv_sec;
289 } else
290 seconds += wtime.tv_sec;
291 out:
292 seconds = PARA_MIN(seconds, length);
293 seconds = PARA_MAX(seconds, 0);
294 msg = make_message(
295 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
296 s? "" : "~",
297 seconds / 60,
298 seconds % 60,
299 (length - seconds) / 60,
300 (length - seconds) % 60,
301 length? (seconds * 100 + length / 2) / length : 0,
302 length / 60,
303 length % 60
304 );
305 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
306 return msg;
307 empty:
308 return para_strdup(NULL);
309 }
310
311 static int want_colors(void)
312 {
313 if (conf.color_arg == color_arg_no)
314 return 0;
315 if (conf.color_arg == color_arg_yes)
316 return 1;
317 if (conf.logfile_given)
318 return 0;
319 return isatty(STDERR_FILENO);
320 }
321
322 static void parse_config_or_die(void)
323 {
324 int ret;
325 char *config_file;
326 struct audiod_cmdline_parser_params params = {
327 .override = 0,
328 .initialize = 0,
329 .check_required = 1,
330 .check_ambiguity = 0,
331 .print_errors = 1
332 };
333
334 if (conf.config_file_given)
335 config_file = para_strdup(conf.config_file_arg);
336 else {
337 char *home = para_homedir();
338 config_file = make_message("%s/.paraslash/audiod.conf", home);
339 free(home);
340 }
341 ret = file_exists(config_file);
342 if (conf.config_file_given && !ret) {
343 PARA_EMERG_LOG("can not read config file %s\n", config_file);
344 goto err;
345 }
346 if (ret)
347 audiod_cmdline_parser_config_file(config_file, &conf, &params);
348 free(config_file);
349 daemon_set_loglevel(conf.loglevel_arg);
350 return;
351 err:
352 free(config_file);
353 exit(EXIT_FAILURE);
354 }
355
356 static void setup_signal_handling(void)
357 {
358 sig_task->fd = para_signal_init();
359 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
360 para_install_sighandler(SIGINT);
361 para_install_sighandler(SIGTERM);
362 para_install_sighandler(SIGHUP);
363 para_sigaction(SIGPIPE, SIG_IGN);
364 }
365
366 static void clear_slot(int slot_num)
367 {
368 struct slot_info *s = &slot[slot_num];
369
370 PARA_INFO_LOG("clearing slot %d\n", slot_num);
371 memset(s, 0, sizeof(struct slot_info));
372 s->format = -1;
373 }
374
375 static void close_receiver(int slot_num)
376 {
377 struct slot_info *s = &slot[slot_num];
378 struct audio_format_info *a;
379
380 if (s->format < 0 || !s->receiver_node)
381 return;
382 a = &afi[s->format];
383 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
384 audio_formats[s->format], slot_num);
385 a->receiver->close(s->receiver_node);
386 btr_remove_node(&s->receiver_node->btrn);
387 free(s->receiver_node);
388 s->receiver_node = NULL;
389 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
390 &a->restart_barrier);
391 }
392
393 static void writer_cleanup(struct writer_node *wn)
394 {
395 struct writer *w;
396
397 if (!wn)
398 return;
399 w = writers + wn->writer_num;
400 PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
401 w->close(wn);
402 btr_remove_node(&wn->btrn);
403 }
404
405 static void close_writers(struct slot_info *s)
406 {
407 struct audio_format_info *a;
408 int i;
409
410 if (s->format < 0)
411 return;
412 assert(s->wns);
413 a = afi + s->format;
414 if (a->num_writers == 0)
415 writer_cleanup(s->wns);
416 else {
417 for (i = 0; i < a->num_writers; i++)
418 writer_cleanup(s->wns + i);
419 }
420 free(s->wns);
421 s->wns = NULL;
422 }
423
424 static void close_filters(struct slot_info *s)
425 {
426 int i;
427 struct audio_format_info *a = afi + s->format;
428 if (a->num_filters == 0)
429 return;
430 for (i = 0; i < a->num_filters; i++) {
431 struct filter_node *fn = s->fns + i;
432 struct filter *f;
433
434 if (!fn)
435 continue;
436 f = filters + fn->filter_num;
437 if (f->close)
438 f->close(fn);
439 btr_remove_node(&fn->btrn);
440 }
441 free(s->fns);
442 s->fns = NULL;
443 }
444
445 static void notify_receivers(int error)
446 {
447 int i;
448
449 FOR_EACH_SLOT(i) {
450 struct slot_info *s = slot + i;
451 if (s->format < 0)
452 continue;
453 if (!s->receiver_node)
454 continue;
455 task_notify(&s->receiver_node->task, error);
456 }
457 }
458
459 static int get_empty_slot(void)
460 {
461 int i;
462 struct slot_info *s;
463
464 FOR_EACH_SLOT(i) {
465 s = &slot[i];
466 if (s->format < 0) {
467 clear_slot(i);
468 return i;
469 }
470 if (s->wns || s->receiver_node || s->fns)
471 continue;
472 clear_slot(i);
473 return i;
474 }
475 return -E_NO_MORE_SLOTS;
476 }
477
478 static void open_filters(struct slot_info *s)
479 {
480 struct audio_format_info *a = afi + s->format;
481 struct filter_node *fn;
482 int nf = a->num_filters;
483 struct btr_node *parent;
484 int i;
485
486 if (nf == 0)
487 return;
488 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
489 assert(s->fns == NULL);
490 s->fns = para_calloc(nf * sizeof(struct filter_node));
491 parent = s->receiver_node->btrn;
492 for (i = 0; i < nf; i++) {
493 struct filter *f = filters + a->filter_nums[i];
494 fn = s->fns + i;
495 fn->filter_num = a->filter_nums[i];
496 fn->conf = a->filter_conf[i];
497 fn->task.pre_select = f->pre_select;
498 fn->task.post_select = f->post_select;
499 fn->btrn = btr_new_node(&(struct btr_node_description)
500 EMBRACE(.name = f->name, .parent = parent,
501 .handler = f->execute, .context = fn));
502
503 f->open(fn);
504 register_task(&sched, &fn->task);
505 parent = fn->btrn;
506 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
507 audio_formats[s->format], i, nf, f->name, (int)(s - slot));
508 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
509 }
510 }
511
512 static void open_writers(struct slot_info *s)
513 {
514 int i;
515 struct audio_format_info *a = afi + s->format;
516 struct writer_node *wn;
517 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
518
519 assert(s->wns == NULL);
520 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
521 * sizeof(struct writer_node));
522 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
523 for (i = 0; i < a->num_writers; i++) {
524 wn = s->wns + i;
525 wn->conf = a->writer_conf[i];
526 wn->writer_num = a->writer_nums[i];
527 register_writer_node(wn, parent, &sched);
528 }
529 }
530
531 /* returns slot num on success */
532 static int open_receiver(int format)
533 {
534 struct audio_format_info *a = &afi[format];
535 struct slot_info *s;
536 int ret, slot_num;
537 struct receiver *r = a->receiver;
538 struct receiver_node *rn;
539
540 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
541 ret = get_empty_slot();
542 if (ret < 0)
543 return ret;
544 slot_num = ret;
545 rn = para_calloc(sizeof(*rn));
546 rn->receiver = r;
547 rn->conf = a->receiver_conf;
548 rn->btrn = btr_new_node(&(struct btr_node_description)
549 EMBRACE(.name = r->name, .context = rn));
550 ret = r->open(rn);
551 if (ret < 0) {
552 btr_remove_node(&rn->btrn);
553 free(rn);
554 return ret;
555 }
556 s = &slot[slot_num];
557 s->format = format;
558 s->receiver_node = rn;
559 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
560 audio_formats[format], r->name, slot_num);
561 rn->task.pre_select = r->pre_select;
562 rn->task.post_select = r->post_select;
563 sprintf(rn->task.status, "%s receiver node", r->name);
564 register_task(&sched, &rn->task);
565 return slot_num;
566 }
567
568 static bool receiver_running(void)
569 {
570 int i;
571 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
572
573 FOR_EACH_SLOT(i) {
574 struct slot_info *s = &slot[i];
575 long unsigned ss2 = s->server_stream_start.tv_sec;
576
577 if (!s->receiver_node)
578 continue;
579 if (s->receiver_node->task.error >= 0)
580 return true;
581 if (ss1 == ss2)
582 return true;
583 }
584 return false;
585 }
586
587 /**
588 * Return the root node of the current buffer tree.
589 *
590 * This is only used for stream grabbing.
591 *
592 * \return \p NULL if no slot is currently active. If more than one buffer tree
593 * exists, the node corresponding to the most recently started receiver is
594 * returned.
595 */
596 struct btr_node *audiod_get_btr_root(void)
597 {
598 int i, newest_slot = -1;
599 struct timeval newest_rstime = {0, 0};
600
601 FOR_EACH_SLOT(i) {
602 struct slot_info *s = &slot[i];
603 struct timeval rstime;
604 if (!s->receiver_node)
605 continue;
606 if (s->receiver_node->task.error < 0)
607 continue;
608 btr_get_node_start(s->receiver_node->btrn, &rstime);
609 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
610 continue;
611 newest_rstime = rstime;
612 newest_slot = i;
613 }
614 if (newest_slot == -1)
615 return NULL;
616 return slot[newest_slot].receiver_node->btrn;
617 }
618
619 /* whether a new instance of a decoder should be started. */
620 static bool must_start_decoder(void)
621 {
622 int cafn = stat_task->current_audio_format_num;
623 unsigned vs = stat_task->vss_status;
624
625 if (audiod_status != AUDIOD_ON)
626 return false;
627 if (cafn < 0)
628 return false;
629 if (!stat_task->ct)
630 return false;
631 if (vs & VSS_STATUS_FLAG_NEXT)
632 return false;
633 if (!(vs & VSS_STATUS_FLAG_PLAYING))
634 return false;
635 if (receiver_running())
636 return false;
637 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
638 return false;
639 return true;
640 }
641
642 static unsigned compute_time_diff(const struct timeval *status_time)
643 {
644 struct timeval tmp, diff;
645 static unsigned count;
646 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
647 const struct timeval max_deviation = {0, 500 * 1000};
648 const int time_smooth = 5;
649
650 if (!status_time)
651 return count;
652 sign = tv_diff(status_time, now, &diff);
653 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
654 // sign, sa_time_diff_sign);
655 if (!count) {
656 sa_time_diff_sign = sign;
657 stat_task->sa_time_diff = diff;
658 count++;
659 goto out;
660 }
661 if (count > 5) {
662 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
663 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
664 PARA_WARNING_LOG("time diff jump: %lims\n",
665 s * tv2ms(&tmp));
666 }
667 count++;
668 sa_time_diff_sign = tv_convex_combination(
669 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
670 count > 10? sign : sign * time_smooth, &diff,
671 &tmp);
672 stat_task->sa_time_diff = tmp;
673 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
674 sign < 0? "-" : "+",
675 tv2ms(&diff),
676 sa_time_diff_sign < 0? "-" : "+",
677 tv2ms(&stat_task->sa_time_diff)
678 );
679 out:
680 stat_task->sa_time_diff_sign = sa_time_diff_sign;
681 return count;
682 }
683
684 static int update_item(int itemnum, char *buf)
685 {
686 long unsigned sec, usec;
687
688 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
689 return 1;
690 free(stat_item_values[itemnum]);
691 stat_item_values[itemnum] = para_strdup(buf);
692 stat_client_write_item(itemnum);
693 switch (itemnum) {
694 case SI_STATUS_FLAGS:
695 stat_task->vss_status = 0;
696 if (strchr(buf, 'N'))
697 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
698 if (strchr(buf, 'P'))
699 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
700 break;
701 case SI_OFFSET:
702 stat_task->offset_seconds = atoi(buf);
703 break;
704 case SI_SECONDS_TOTAL:
705 stat_task->length_seconds = atoi(buf);
706 break;
707 case SI_STREAM_START:
708 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
709 stat_task->server_stream_start.tv_sec = sec;
710 stat_task->server_stream_start.tv_usec = usec;
711 }
712 break;
713 case SI_CURRENT_TIME:
714 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
715 struct timeval tv = {sec, usec};
716 compute_time_diff(&tv);
717 }
718 break;
719 case SI_FORMAT:
720 stat_task->current_audio_format_num
721 = get_audio_format_num(buf);
722 }
723 return 1;
724 }
725
726 static int parse_stream_command(const char *txt, char **cmd)
727 {
728 int ret, len;
729 char *re, *p = strchr(txt, ':');
730
731 if (!p)
732 return -E_MISSING_COLON;
733 *cmd = p + 1;
734 len = p - txt;
735 re = malloc(len + 1);
736 strncpy(re, txt, len);
737 re[len] = '\0';
738 ret = get_matching_audio_format_nums(re);
739 free(re);
740 return ret;
741 }
742
743 static int add_filter(int format, char *cmdline)
744 {
745 struct audio_format_info *a = &afi[format];
746 int filter_num, nf = a->num_filters;
747 void *cfg;
748
749 filter_num = check_filter_arg(cmdline, &cfg);
750 if (filter_num < 0)
751 return filter_num;
752 a->filter_conf = para_realloc(a->filter_conf,
753 (nf + 1) * sizeof(void *));
754 a->filter_nums = para_realloc(a->filter_nums,
755 (nf + 1) * sizeof(unsigned));
756 a->filter_nums[nf] = filter_num;
757 a->filter_conf[nf] = cfg;
758 a->num_filters++;
759 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
760 filters[filter_num].name);
761 return filter_num;
762 }
763
764 static int parse_writer_args(void)
765 {
766 int i, ret;
767 char *cmd;
768 struct audio_format_info *a;
769
770 for (i = 0; i < conf.writer_given; i++) {
771 void *wconf;
772 int j, nw, writer_num, af_mask;
773
774 ret = parse_stream_command(conf.writer_arg[i], &cmd);
775 if (ret < 0)
776 return ret;
777 af_mask = ret;
778 FOR_EACH_AUDIO_FORMAT(j) {
779 a = afi + j;
780 if ((af_mask & (1 << j)) == 0) /* no match */
781 continue;
782 wconf = check_writer_arg_or_die(cmd, &writer_num);
783 nw = a->num_writers;
784 a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
785 a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
786 a->writer_nums[nw] = writer_num;
787 a->writer_conf[nw] = wconf;
788 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
789 nw, writer_names[writer_num]);
790 a->num_writers++;
791 }
792 }
793 /* Use default writer for audio formats which are not yet set up. */
794 FOR_EACH_AUDIO_FORMAT(i) {
795 void *writer_conf;
796 int writer_num;
797 a = afi + i;
798 if (a->num_writers > 0)
799 continue; /* already set up */
800 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
801 a->writer_nums = para_malloc(sizeof(int));
802 a->writer_nums[0] = writer_num;
803 a->writer_conf = para_malloc(sizeof(void *));
804 a->writer_conf[0] = writer_conf;
805 a->num_writers = 1;
806 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
807 writer_names[writer_num]);
808 }
809 return 1;
810 }
811
812 static int parse_receiver_args(void)
813 {
814 int i, ret, receiver_num;
815 char *cmd = NULL;
816 struct audio_format_info *a;
817
818 for (i = conf.receiver_given - 1; i >= 0; i--) {
819 char *arg;
820 int j, af_mask;
821
822 ret = parse_stream_command(conf.receiver_arg[i], &arg);
823 if (ret < 0)
824 goto out;
825 af_mask = ret;
826 FOR_EACH_AUDIO_FORMAT(j) {
827 a = afi + j;
828 if ((af_mask & (1 << j)) == 0) /* no match */
829 continue;
830 /*
831 * If multiple receivers are given for this audio format, the
832 * last one wins and we have to free the previous receiver
833 * config here. Since we are iterating backwards, the winning
834 * receiver arg is in fact the first one given.
835 */
836 if (a->receiver_conf)
837 a->receiver->free_config(a->receiver_conf);
838 a->receiver_conf = check_receiver_arg(arg, &receiver_num);
839 ret = -E_RECV_SYNTAX;
840 if (!a->receiver_conf)
841 goto out;
842 a->receiver = receivers + receiver_num;
843 }
844 }
845 /*
846 * Use the first available receiver with no arguments for those audio
847 * formats for which no receiver was specified.
848 */
849 cmd = para_strdup(receivers[0].name);
850 FOR_EACH_AUDIO_FORMAT(i) {
851 a = &afi[i];
852 if (a->receiver_conf)
853 continue;
854 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
855 if (!a->receiver_conf)
856 return -E_RECV_SYNTAX;
857 a->receiver = &receivers[receiver_num];
858 }
859 FOR_EACH_AUDIO_FORMAT(i) {
860 a = afi + i;
861 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
862 audio_formats[i], a->receiver->name);
863 }
864 ret = 1;
865 out:
866 free(cmd);
867 return ret;
868 }
869
870 static int init_default_filters(void)
871 {
872 int i, ret = 1;
873
874 FOR_EACH_AUDIO_FORMAT(i) {
875 struct audio_format_info *a = &afi[i];
876 char *tmp;
877 int j;
878
879 if (a->num_filters)
880 continue; /* no default -- nothing to to */
881 /*
882 * udp and dccp streams are fec-encoded, so add fecdec as the
883 * first filter.
884 */
885 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
886 strcmp(afi[i].receiver->name, "dccp") == 0) {
887 tmp = para_strdup("fecdec");
888 add_filter(i, tmp);
889 free(tmp);
890 if (ret < 0)
891 goto out;
892 }
893 /* add "dec" to audio format name */
894 tmp = make_message("%sdec", audio_formats[i]);
895 for (j = 0; filters[j].name; j++)
896 if (!strcmp(tmp, filters[j].name))
897 break;
898 free(tmp);
899 ret = -E_UNSUPPORTED_FILTER;
900 if (!filters[j].name)
901 goto out;
902 tmp = para_strdup(filters[j].name);
903 ret = add_filter(i, tmp);
904 free(tmp);
905 if (ret < 0)
906 goto out;
907 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
908 filters[j].name);
909 }
910 out:
911 return ret;
912 }
913
914 static int parse_filter_args(void)
915 {
916 int i, j, ret, af_mask;
917
918 for (i = 0; i < conf.filter_given; i++) {
919 char *arg;
920 ret = parse_stream_command(conf.filter_arg[i], &arg);
921 if (ret < 0)
922 goto out;
923 af_mask = ret;
924 FOR_EACH_AUDIO_FORMAT(j) {
925 if ((af_mask & (1 << j)) == 0) /* no match */
926 continue;
927 ret = add_filter(j, arg);
928 if (ret < 0)
929 goto out;
930 }
931 }
932 ret = init_default_filters(); /* use default values for the rest */
933 out:
934 return ret;
935 }
936
937 static int parse_stream_args(void)
938 {
939 int ret;
940
941 ret = parse_receiver_args();
942 if (ret < 0)
943 return ret;
944 ret = parse_filter_args();
945 if (ret < 0)
946 return ret;
947 ret = parse_writer_args();
948 if (ret < 0)
949 return ret;
950 return 1;
951 }
952
953 /* does not unlink socket on errors */
954 static int audiod_get_socket(void)
955 {
956 struct sockaddr_un unix_addr;
957 int ret, fd;
958
959 if (conf.socket_given)
960 socket_name = para_strdup(conf.socket_arg);
961 else {
962 char *hn = para_hostname();
963 socket_name = make_message("/var/paraslash/audiod_socket.%s",
964 hn);
965 free(hn);
966 }
967 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
968 if (conf.force_given)
969 unlink(socket_name);
970 ret = create_local_socket(socket_name, &unix_addr,
971 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
972 if (ret < 0)
973 goto err;
974 fd = ret;
975 if (listen(fd , 5) < 0) {
976 ret = -ERRNO_TO_PARA_ERROR(errno);
977 goto err;
978 }
979 ret = mark_fd_nonblocking(fd);
980 if (ret < 0)
981 goto err;
982 return fd;
983 err:
984 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
985 exit(EXIT_FAILURE);
986 }
987
988 static void signal_pre_select(struct sched *s, struct task *t)
989 {
990 struct signal_task *st = container_of(t, struct signal_task, task);
991 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
992 }
993
994 static int signal_post_select(struct sched *s, __a_unused struct task *t)
995 {
996 int signum;
997
998 signum = para_next_signal(&s->rfds);
999 switch (signum) {
1000 case SIGINT:
1001 case SIGTERM:
1002 case SIGHUP:
1003 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1004 clean_exit(EXIT_FAILURE, "caught deadly signal");
1005 }
1006 return 0;
1007 }
1008
1009 static void signal_setup_default(struct signal_task *st)
1010 {
1011 st->task.pre_select = signal_pre_select;
1012 st->task.post_select = signal_post_select;
1013 sprintf(st->task.status, "signal task");
1014 }
1015
1016 static void command_pre_select(struct sched *s, struct task *t)
1017 {
1018 struct command_task *ct = container_of(t, struct command_task, task);
1019 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1020 }
1021
1022 static int command_post_select(struct sched *s, struct task *t)
1023 {
1024 int ret;
1025 struct command_task *ct = container_of(t, struct command_task, task);
1026 static struct timeval last_status_dump;
1027 struct timeval tmp, delay = {0, 500 * 1000};
1028
1029 tv_add(&last_status_dump, &delay, &tmp);
1030 if (tv_diff(&tmp, now, NULL) < 0) {
1031 audiod_status_dump();
1032 last_status_dump = *now;
1033 }
1034
1035 ret = handle_connect(ct->fd, &s->rfds);
1036 if (ret < 0)
1037 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1038 audiod_status_dump();
1039 return 0;
1040 }
1041
1042 static void init_command_task(struct command_task *ct)
1043 {
1044 ct->task.pre_select = command_pre_select;
1045 ct->task.post_select = command_post_select;
1046 ct->task.error = 0;
1047 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1048 sprintf(ct->task.status, "command task");
1049 }
1050
1051 static void close_stat_pipe(void)
1052 {
1053 if (!stat_task->ct)
1054 return;
1055 client_close(stat_task->ct);
1056 stat_task->ct = NULL;
1057 clear_and_dump_items();
1058 stat_task->length_seconds = 0;
1059 stat_task->offset_seconds = 0;
1060 stat_task->vss_status = 0;
1061 stat_task->current_audio_format_num = -1;
1062 audiod_status_dump();
1063 }
1064
1065 /**
1066 * close the connection to para_server and exit
1067 *
1068 * \param status the exit status which is passed to exit(3)
1069 * \param msg the log message
1070 *
1071 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1072 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1073 * EXIT_FAILURE.
1074 *
1075 * \sa exit(3)
1076 */
1077 void __noreturn clean_exit(int status, const char *msg)
1078 {
1079 PARA_EMERG_LOG("%s\n", msg);
1080 if (socket_name)
1081 unlink(socket_name);
1082 close_stat_pipe();
1083 exit(status);
1084 }
1085
1086 /* avoid busy loop if server is down */
1087 static void set_stat_task_restart_barrier(unsigned seconds)
1088 {
1089 struct timeval delay = {seconds, 0};
1090 tv_add(now, &delay, &stat_task->restart_barrier);
1091 }
1092
1093 static bool must_close_slot(int slot_num)
1094 {
1095 struct slot_info *s = &slot[slot_num];
1096 struct audio_format_info *a = afi + s->format;
1097 int i;
1098
1099 if (s->format < 0)
1100 return false;
1101 if (s->receiver_node && s->receiver_node->task.error >= 0)
1102 return false;
1103 for (i = 0; i < a->num_filters; i++)
1104 if (s->fns && s->fns[i].task.error >= 0)
1105 return false;
1106 if (a->num_writers > 0) {
1107 for (i = 0; i < a->num_writers; i++)
1108 if (s->wns && s->wns[i].task.error >= 0)
1109 return false;
1110 } else {
1111 if (s->wns && s->wns[0].task.error >= 0)
1112 return false;
1113 }
1114 return true;
1115 }
1116
1117 static void close_unused_slots(void)
1118 {
1119 int i;
1120
1121 FOR_EACH_SLOT(i) {
1122 struct slot_info *s = slot + i;
1123 if (!must_close_slot(i))
1124 continue;
1125 PARA_INFO_LOG("closing slot %d\n", i);
1126 close_writers(s);
1127 close_filters(s);
1128 close_receiver(i);
1129 clear_slot(i);
1130 }
1131 }
1132
1133 /*
1134 * Check if any receivers/filters/writers need to be started and do so if
1135 * necessary.
1136 */
1137 static void start_stop_decoders(void)
1138 {
1139 int ret;
1140 struct slot_info *sl;
1141 struct audio_format_info *a;
1142
1143 close_unused_slots();
1144 if (audiod_status != AUDIOD_ON ||
1145 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1146 return notify_receivers(E_NOT_PLAYING);
1147 if (!must_start_decoder())
1148 return;
1149 ret = open_receiver(stat_task->current_audio_format_num);
1150 if (ret < 0) {
1151 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1152 return;
1153 }
1154 sl = slot + ret;
1155 a = afi + sl->format;
1156 if (a->num_filters)
1157 open_filters(sl);
1158 open_writers(sl);
1159 activate_grab_clients(&sched);
1160 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1161 }
1162
1163 static void status_pre_select(struct sched *s, struct task *t)
1164 {
1165 struct status_task *st = container_of(t, struct status_task, task);
1166 int i, ret, cafn = stat_task->current_audio_format_num;
1167
1168 if (must_start_decoder())
1169 goto min_delay;
1170 FOR_EACH_SLOT(i)
1171 if (must_close_slot(i))
1172 goto min_delay;
1173 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1174 if (ret > 0)
1175 goto min_delay;
1176 if (st->ct && audiod_status == AUDIOD_OFF)
1177 goto min_delay;
1178 if (!st->ct && audiod_status != AUDIOD_OFF)
1179 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1180 if (cafn >= 0)
1181 sched_request_barrier(&afi[cafn].restart_barrier, s);
1182 /*
1183 * If para_server is playing we'd like to have a smooth time display
1184 * even if we are running in standby mode. So we request a timeout that
1185 * expires at the next full second.
1186 */
1187 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1188 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1189 return;
1190 min_delay:
1191 sched_min_delay(s);
1192 }
1193
1194 /* restart the client task if necessary */
1195 static int status_post_select(struct sched *s, struct task *t)
1196 {
1197 struct status_task *st = container_of(t, struct status_task, task);
1198
1199 if (audiod_status == AUDIOD_OFF) {
1200 if (!st->ct)
1201 goto out;
1202 if (st->ct->task.error >= 0) {
1203 task_notify(&st->ct->task, E_AUDIOD_OFF);
1204 goto out;
1205 }
1206 close_stat_pipe();
1207 st->clock_diff_count = conf.clock_diff_count_arg;
1208 goto out;
1209 }
1210 if (st->ct) {
1211 char *buf;
1212 size_t sz;
1213 int ret;
1214 if (st->ct->task.error < 0) {
1215 close_stat_pipe();
1216 goto out;
1217 }
1218 if (st->ct->status != CL_RECEIVING)
1219 goto out;
1220 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1221 if (ret <= 0) {
1222 struct timeval diff;
1223 tv_diff(now, &st->last_status_read, &diff);
1224 if (diff.tv_sec > 61)
1225 task_notify(&st->ct->task, E_AUDIOD_OFF);
1226 goto out;
1227 }
1228 btr_merge(st->btrn, st->min_iqs);
1229 sz = btr_next_buffer(st->btrn, &buf);
1230 ret = for_each_stat_item(buf, sz, update_item);
1231 if (ret < 0) {
1232 task_notify(&st->ct->task, E_AUDIOD_OFF);
1233 goto out;
1234 }
1235 if (sz != ret) {
1236 btr_consume(st->btrn, sz - ret);
1237 st->last_status_read = *now;
1238 st->min_iqs = 0;
1239 } else /* current status item crosses buffers */
1240 st->min_iqs = sz + 1;
1241 goto out;
1242 }
1243 btr_drain(st->btrn);
1244 st->current_audio_format_num = -1;
1245 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1246 goto out;
1247 if (st->clock_diff_count) { /* get status only one time */
1248 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1249 int argc = 5;
1250 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1251 st->clock_diff_count--;
1252 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1253 set_stat_task_restart_barrier(2);
1254
1255 } else {
1256 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1257 int argc = 4;
1258 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1259 set_stat_task_restart_barrier(5);
1260 }
1261 free(stat_item_values[SI_BASENAME]);
1262 stat_item_values[SI_BASENAME] = para_strdup(
1263 "no connection to para_server");
1264 stat_client_write_item(SI_BASENAME);
1265 st->last_status_read = *now;
1266 out:
1267 start_stop_decoders();
1268 return 0;
1269 }
1270
1271 static void init_status_task(struct status_task *st)
1272 {
1273 memset(st, 0, sizeof(struct status_task));
1274 st->task.pre_select = status_pre_select;
1275 st->task.post_select = status_post_select;
1276 st->sa_time_diff_sign = 1;
1277 st->clock_diff_count = conf.clock_diff_count_arg;
1278 st->current_audio_format_num = -1;
1279 sprintf(st->task.status, "stat");
1280 st->btrn = btr_new_node(&(struct btr_node_description)
1281 EMBRACE(.name = "stat"));
1282 }
1283
1284 static void set_initial_status(void)
1285 {
1286 audiod_status = AUDIOD_ON;
1287 if (!conf.mode_given)
1288 return;
1289 if (!strcmp(conf.mode_arg, "sb")) {
1290 audiod_status = AUDIOD_STANDBY;
1291 return;
1292 }
1293 if (!strcmp(conf.mode_arg, "off")) {
1294 audiod_status = AUDIOD_OFF;
1295 return;
1296 }
1297 if (strcmp(conf.mode_arg, "on"))
1298 PARA_WARNING_LOG("invalid mode\n");
1299 }
1300
1301 __noreturn static void print_help_and_die(void)
1302 {
1303 int d = conf.detailed_help_given;
1304 const char **p = d? audiod_args_info_detailed_help
1305 : audiod_args_info_help;
1306
1307 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1308 AUDIOD_CMDLINE_PARSER_VERSION);
1309 printf_or_die("%s\n\n", audiod_args_info_usage);
1310 for (; *p; p++)
1311 printf_or_die("%s\n", *p);
1312 print_receiver_helps(d);
1313 print_filter_helps(d);
1314 print_writer_helps(d);
1315 exit(0);
1316 }
1317
1318 static void init_colors_or_die(void)
1319 {
1320 int i;
1321
1322 if (!want_colors())
1323 return;
1324 daemon_set_default_log_colors();
1325 daemon_set_flag(DF_COLOR_LOG);
1326 for (i = 0; i < conf.log_color_given; i++)
1327 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1328 }
1329
1330 /**
1331 * the main function of para_audiod
1332 *
1333 * \param argc usual argument count
1334 * \param argv usual argument vector
1335 *
1336 * \return EXIT_SUCCESS or EXIT_FAILURE
1337 *
1338 * \sa para_audiod(1)
1339 * */
1340 int main(int argc, char *argv[])
1341 {
1342 int ret, i;
1343 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1344 struct audiod_cmdline_parser_params params = {
1345 .override = 0,
1346 .initialize = 1,
1347 .check_required = 0,
1348 .check_ambiguity = 0,
1349 .print_errors = 1
1350 };
1351
1352 valid_fd_012();
1353 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1354 exit(EXIT_FAILURE);
1355 HANDLE_VERSION_FLAG("audiod", conf);
1356 /* init receivers/filters/writers early to make help work */
1357 recv_init();
1358 filter_init();
1359 writer_init();
1360 if (conf.help_given || conf.detailed_help_given)
1361 print_help_and_die();
1362 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1363 parse_config_or_die();
1364 init_colors_or_die();
1365 init_random_seed_or_die();
1366 daemon_set_flag(DF_LOG_TIME);
1367 daemon_set_flag(DF_LOG_HOSTNAME);
1368 daemon_set_flag(DF_LOG_LL);
1369 if (conf.log_timing_given)
1370 daemon_set_flag(DF_LOG_TIMING);
1371 if (conf.logfile_given) {
1372 daemon_set_logfile(conf.logfile_arg);
1373 daemon_open_log_or_die();
1374 }
1375 ret = parse_stream_args();
1376 if (ret < 0) {
1377 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1378 exit(EXIT_FAILURE);
1379 }
1380 log_welcome("para_audiod");
1381 set_server_start_time(NULL);
1382 set_initial_status();
1383 FOR_EACH_SLOT(i)
1384 clear_slot(i);
1385 setup_signal_handling();
1386 signal_setup_default(sig_task);
1387
1388 init_status_task(stat_task);
1389 init_command_task(cmd_task);
1390
1391 if (conf.daemon_given)
1392 daemonize(false /* parent exits immediately */);
1393
1394 register_task(&sched, &sig_task->task);
1395 register_task(&sched, &cmd_task->task);
1396 register_task(&sched, &stat_task->task);
1397 sched.default_timeout.tv_sec = 2;
1398 sched.default_timeout.tv_usec = 999 * 1000;
1399 ret = schedule(&sched);
1400
1401 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1402 return EXIT_FAILURE;
1403 }