audiod: Don't open the receiver too early.
[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 f->close(fn);
385 btr_free_node(fn->btrn);
386 }
387 free(s->fns);
388 s->fns = NULL;
389 }
390
391 static void kill_all_decoders(int error)
392 {
393 int i, j;
394
395 FOR_EACH_SLOT(i) {
396 struct slot_info *s = &slot[i];
397 struct audio_format_info *a;
398 if (s->format < 0)
399 continue;
400 a = afi + s->format;
401 if (s->wns)
402 for (j = 0; j < a->num_writers; j++)
403 s->wns[j].task.error = error;
404 if (s->fns)
405 for (j = 0; j < a->num_writers; j++)
406 s->fns[j].task.error = error;
407 if (s->receiver_node)
408 s->receiver_node->task.error = error;
409 }
410 }
411
412 static int get_empty_slot(void)
413 {
414 int i;
415 struct slot_info *s;
416
417 FOR_EACH_SLOT(i) {
418 s = &slot[i];
419 if (s->format < 0) {
420 clear_slot(i);
421 return i;
422 }
423 if (s->wns || s->receiver_node || s->fns)
424 continue;
425 clear_slot(i);
426 return i;
427 }
428 return -E_NO_MORE_SLOTS;
429 }
430
431 /**
432 * get the number of filters
433 *
434 * \param audio_format_num the number identifying the audio format
435 *
436 * \return the number of filters for the given audio format
437 *
438 * \sa struct filter;
439 */
440 int num_filters(int audio_format_num)
441 {
442 return afi[audio_format_num].num_filters;
443 }
444
445 static void open_filters(struct slot_info *s)
446 {
447 struct audio_format_info *a = afi + s->format;
448 struct filter_node *fn;
449 int nf = a->num_filters;
450 struct btr_node *parent;
451 int i;
452
453 if (nf == 0)
454 return;
455 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
456 assert(s->fns == NULL);
457 s->fns = para_calloc(nf * sizeof(struct filter_node));
458 parent = s->receiver_node->btrn;
459 for (i = 0; i < nf; i++) {
460 struct filter *f = filters + a->filter_nums[i];
461 fn = s->fns + i;
462 fn->filter_num = a->filter_nums[i];
463 fn->conf = a->filter_conf[i];
464 fn->task.pre_select = f->pre_select;
465 fn->task.post_select = f->post_select;
466 fn->btrn = btr_new_node(f->name, parent, f->execute, fn);
467 f->open(fn);
468 register_task(&fn->task);
469 parent = fn->btrn;
470 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
471 audio_formats[s->format], i, nf, f->name, s - slot);
472 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
473 }
474 }
475
476 static void open_writers(struct slot_info *s)
477 {
478 int i;
479 struct audio_format_info *a = afi + s->format;
480 struct writer_node *wn;
481 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
482
483 assert(s->wns == NULL);
484 s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
485 * sizeof(struct writer_node));
486 if (a->num_writers == 0)
487 setup_writer_node(NULL, parent, s->wns);
488 else {
489 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
490 for (i = 0; i < a->num_writers; i++) {
491 wn = s->wns + i;
492 wn->conf = a->writer_conf[i];
493 wn->writer_num = a->writer_nums[i];
494 register_writer_node(wn, parent);
495 }
496 }
497 }
498
499 /* returns slot num on success */
500 static int open_receiver(int format)
501 {
502 struct audio_format_info *a = &afi[format];
503 struct slot_info *s;
504 int ret, slot_num;
505 struct receiver *r = a->receiver;
506 struct receiver_node *rn;
507 const struct timeval restart_delay = {2, 0};
508
509 ret = get_empty_slot();
510 if (ret < 0)
511 goto err;
512 slot_num = ret;
513 s = &slot[slot_num];
514 s->format = format;
515 s->receiver_node = para_calloc(sizeof(struct receiver_node));
516 rn = s->receiver_node;
517 rn->receiver = r;
518 rn->conf = a->receiver_conf;
519 rn->btrn = btr_new_node(r->name, NULL, NULL, rn);
520 ret = r->open(rn);
521 if (ret < 0) {
522 btr_free_node(rn->btrn);
523 free(rn);
524 s->receiver_node = NULL;
525 goto err;
526 }
527 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
528 audio_formats[s->format], r->name, slot_num);
529 rn->task.pre_select = r->pre_select;
530 rn->task.post_select = r->post_select;
531 sprintf(rn->task.status, "%s receiver node", r->name);
532 register_task(&rn->task);
533 ret = slot_num;
534 err:
535 if (ret < 0)
536 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
537 tv_add(now, &restart_delay, &afi[format].restart_barrier);
538 return ret;
539 }
540
541 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
542 static int receiver_running(int format)
543 {
544 int i, ret = 0;
545
546 FOR_EACH_SLOT(i) {
547 struct slot_info *s = &slot[i];
548 if (s->format != format)
549 continue;
550 if (!s->receiver_node)
551 continue;
552 if (s->receiver_node->task.error >= 0)
553 return 1;
554 ret = -1;
555 }
556 return ret;
557 }
558
559 struct btr_node *audiod_get_btr_root(void)
560 {
561 int i, newest_slot = -1;
562 struct timeval newest_rstime = {0, 0};
563
564 FOR_EACH_SLOT(i) {
565 struct slot_info *s = &slot[i];
566 struct timeval rstime;
567 if (!s->receiver_node)
568 continue;
569 if (s->receiver_node->task.error < 0)
570 continue;
571 btr_get_node_start(s->receiver_node->btrn, &rstime);
572 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
573 continue;
574 newest_rstime = rstime;
575 newest_slot = i;
576 }
577 if (newest_slot == -1)
578 return NULL;
579 return slot[newest_slot].receiver_node->btrn;
580 }
581
582 /* returns slot num on success. */
583 static int open_current_receiver(struct sched *s)
584 {
585 struct timeval diff;
586 int ret, cafn = stat_task->current_audio_format_num;
587
588 if (cafn < 0 || !stat_task->ct)
589 return -1;
590 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
591 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
592 return -1;
593 ret = receiver_running(cafn);
594 if (ret > 0) /* already running and not eof */
595 return -1;
596 if (ret < 0) { /* eof */
597 /*
598 * para_server uses a zero start time during the announcement
599 * period, i.e. before it sends the first chunk. Wait until
600 * this period begins to avoid restarting the receiver that
601 * belongs to the file just completed.
602 */
603 if (stat_task->server_stream_start.tv_sec != 0) {
604 sched_request_timeout_ms(100, s);
605 return -1;
606 }
607 }
608 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
609 if (tv_diff(&s->timeout, &diff, NULL) > 0)
610 sched_request_timeout(&diff, s);
611 else
612 sched_min_delay(s);
613 return -1;
614 }
615 /* start a new receiver */
616 return open_receiver(cafn);
617 }
618
619 static unsigned compute_time_diff(const struct timeval *status_time)
620 {
621 struct timeval tmp, diff;
622 static unsigned count;
623 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
624 const struct timeval max_deviation = {0, 500 * 1000};
625 const int time_smooth = 5;
626
627 if (!status_time)
628 return count;
629 sign = tv_diff(status_time, now, &diff);
630 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
631 // sign, sa_time_diff_sign);
632 if (!count) {
633 sa_time_diff_sign = sign;
634 stat_task->sa_time_diff = diff;
635 count++;
636 goto out;
637 }
638 if (count > 5) {
639 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
640 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
641 PARA_WARNING_LOG("time diff jump: %lims\n",
642 s * tv2ms(&tmp));
643 }
644 count++;
645 sa_time_diff_sign = tv_convex_combination(
646 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
647 count > 10? sign : sign * time_smooth, &diff,
648 &tmp);
649 stat_task->sa_time_diff = tmp;
650 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
651 sign > 0? "+" : "-",
652 tv2ms(&diff),
653 sa_time_diff_sign ? "+" : "-",
654 tv2ms(&stat_task->sa_time_diff)
655 );
656 out:
657 stat_task->sa_time_diff_sign = sa_time_diff_sign;
658 return count;
659 }
660
661 static int update_item(int itemnum, char *buf)
662 {
663 long unsigned sec, usec;
664
665 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
666 return 1;
667 free(stat_item_values[itemnum]);
668 stat_item_values[itemnum] = para_strdup(buf);
669 stat_client_write_item(itemnum);
670 switch (itemnum) {
671 case SI_STATUS_FLAGS:
672 stat_task->vss_status = 0;
673 if (strchr(buf, 'N'))
674 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
675 if (strchr(buf, 'P'))
676 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
677 break;
678 case SI_OFFSET:
679 stat_task->offset_seconds = atoi(buf);
680 break;
681 case SI_SECONDS_TOTAL:
682 stat_task->length_seconds = atoi(buf);
683 break;
684 case SI_STREAM_START:
685 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
686 struct timeval a_start, delay;
687 delay.tv_sec = conf.stream_delay_arg / 1000;
688 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
689 stat_task->server_stream_start.tv_sec = sec;
690 stat_task->server_stream_start.tv_usec = usec;
691 if (compute_time_diff(NULL) > 2) {
692 if (stat_task->sa_time_diff_sign < 0)
693 tv_add(&stat_task->server_stream_start,
694 &stat_task->sa_time_diff, &a_start);
695 else
696 tv_diff(&stat_task->server_stream_start,
697 &stat_task->sa_time_diff, &a_start);
698 tv_add(&a_start, &delay, &initial_delay_barrier);
699 }
700 }
701 break;
702 case SI_CURRENT_TIME:
703 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
704 struct timeval tv = {sec, usec};
705 compute_time_diff(&tv);
706 }
707 break;
708 case SI_FORMAT:
709 stat_task->current_audio_format_num
710 = get_audio_format_num(buf);
711 }
712 return 1;
713 }
714
715 static int parse_stream_command(const char *txt, char **cmd)
716 {
717 char *p = strchr(txt, ':');
718 int i;
719
720 if (!p)
721 return -E_MISSING_COLON;
722 p++;
723 FOR_EACH_AUDIO_FORMAT(i) {
724 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
725 continue;
726 *cmd = p;
727 return i;
728 }
729 return -E_UNSUPPORTED_AUDIO_FORMAT;
730 }
731
732 static int add_filter(int format, char *cmdline)
733 {
734 struct audio_format_info *a = &afi[format];
735 int filter_num, nf = a->num_filters;
736
737 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
738 if (filter_num < 0)
739 return filter_num;
740 a->filter_nums[nf] = filter_num;
741 a->num_filters++;
742 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
743 filters[filter_num].name);
744 return filter_num;
745 }
746
747 static int parse_writer_args(void)
748 {
749 int i, ret, nw;
750 char *cmd;
751 struct audio_format_info *a;
752
753 nw = PARA_MAX(1U, conf.writer_given);
754 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
755 FOR_EACH_AUDIO_FORMAT(i) {
756 a = &afi[i];
757 a->writer_conf = para_malloc(nw * sizeof(void *));
758 a->writer_nums = para_malloc(nw * sizeof(int));
759 a->num_writers = 0;
760 }
761 for (i = 0; i < conf.writer_given; i++) {
762 void *wconf;
763 int writer_num;
764 ret = parse_stream_command(conf.writer_arg[i], &cmd);
765 if (ret < 0)
766 goto out;
767 a = &afi[ret];
768 nw = a->num_writers;
769 wconf = check_writer_arg(cmd, &writer_num);
770 if (!wconf) {
771 ret = writer_num;
772 goto out;
773 }
774 a->writer_nums[nw] = writer_num;
775 a->writer_conf[nw] = wconf;
776 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
777 nw, writer_names[writer_num]);
778 a->num_writers++;
779 }
780 ret = 1;
781 out:
782 return ret;
783 }
784
785 static int parse_receiver_args(void)
786 {
787 int i, ret, receiver_num;
788 char *cmd = NULL;
789 struct audio_format_info *a;
790
791 for (i = conf.receiver_given - 1; i >= 0; i--) {
792 char *arg = conf.receiver_arg[i];
793 char *recv_arg = strchr(arg, ':');
794 ret = -E_MISSING_COLON;
795 if (!recv_arg)
796 goto out;
797 *recv_arg = '\0';
798 recv_arg++;
799 ret = get_audio_format_num(arg);
800 if (ret < 0)
801 goto out;
802 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
803 if (!afi[ret].receiver_conf) {
804 ret = -E_RECV_SYNTAX;
805 goto out;
806 }
807 afi[ret].receiver = &receivers[receiver_num];
808 }
809 /* use the first available receiver with no arguments
810 * for those audio formats for which no receiver
811 * was specified
812 */
813 cmd = para_strdup(receivers[0].name);
814 FOR_EACH_AUDIO_FORMAT(i) {
815 a = &afi[i];
816 if (a->receiver_conf)
817 continue;
818 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
819 if (!a->receiver_conf)
820 return -E_RECV_SYNTAX;
821 a->receiver = &receivers[receiver_num];
822 }
823 ret = 1;
824 out:
825 free(cmd);
826 return ret;
827 }
828
829 static int init_default_filters(void)
830 {
831 int i, ret = 1;
832
833 FOR_EACH_AUDIO_FORMAT(i) {
834 struct audio_format_info *a = &afi[i];
835 char *tmp;
836 int j;
837
838 if (a->num_filters)
839 continue; /* no default -- nothing to to */
840 /* add "dec" to audio format name */
841 tmp = make_message("%sdec", audio_formats[i]);
842 for (j = 0; filters[j].name; j++)
843 if (!strcmp(tmp, filters[j].name))
844 break;
845 free(tmp);
846 ret = -E_UNSUPPORTED_FILTER;
847 if (!filters[j].name)
848 goto out;
849 tmp = para_strdup(filters[j].name);
850 ret = add_filter(i, tmp);
851 free(tmp);
852 if (ret < 0)
853 goto out;
854 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
855 filters[j].name);
856 }
857 out:
858 return ret;
859 }
860
861 static int parse_filter_args(void)
862 {
863 int i, ret, nf;
864
865 nf = PARA_MAX(1U, conf.filter_given);
866 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
867 FOR_EACH_AUDIO_FORMAT(i) {
868 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
869 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
870 }
871 if (!conf.no_default_filters_given)
872 return init_default_filters();
873 for (i = 0; i < conf.filter_given; i++) {
874 char *arg = conf.filter_arg[i];
875 char *filter_name = strchr(arg, ':');
876 ret = -E_MISSING_COLON;
877 if (!filter_name)
878 goto out;
879 *filter_name = '\0';
880 filter_name++;
881 ret = get_audio_format_num(arg);
882 if (ret < 0)
883 goto out;
884 ret = add_filter(ret, filter_name);
885 if (ret < 0)
886 goto out;
887 }
888 ret = init_default_filters(); /* use default values for the rest */
889 out:
890 return ret;
891 }
892
893 static int parse_stream_args(void)
894 {
895 int ret;
896
897 ret = parse_receiver_args();
898 if (ret < 0)
899 return ret;
900 ret = parse_filter_args();
901 if (ret < 0)
902 return ret;
903 ret = parse_writer_args();
904 if (ret < 0)
905 return ret;
906 return 1;
907 }
908
909 /* does not unlink socket on errors */
910 static int audiod_get_socket(void)
911 {
912 struct sockaddr_un unix_addr;
913 int ret, fd;
914
915 if (conf.socket_given)
916 socket_name = para_strdup(conf.socket_arg);
917 else {
918 char *hn = para_hostname();
919 socket_name = make_message("/var/paraslash/audiod_socket.%s",
920 hn);
921 free(hn);
922 }
923 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
924 if (conf.force_given)
925 unlink(socket_name);
926 ret = create_local_socket(socket_name, &unix_addr,
927 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
928 if (ret < 0)
929 goto err;
930 fd = ret;
931 if (listen(fd , 5) < 0) {
932 ret = -ERRNO_TO_PARA_ERROR(errno);
933 goto err;
934 }
935 ret = mark_fd_nonblocking(fd);
936 if (ret < 0)
937 goto err;
938 return fd;
939 err:
940 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
941 exit(EXIT_FAILURE);
942 }
943
944 static void signal_pre_select(struct sched *s, struct task *t)
945 {
946 struct signal_task *st = container_of(t, struct signal_task, task);
947 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
948 }
949
950 static void signal_post_select(struct sched *s, struct task *t)
951 {
952 struct signal_task *st = container_of(t, struct signal_task, task);
953
954 if (!FD_ISSET(st->fd, &s->rfds))
955 return;
956
957 st->signum = para_next_signal();
958 switch (st->signum) {
959 case SIGINT:
960 case SIGTERM:
961 case SIGHUP:
962 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
963 clean_exit(EXIT_FAILURE, "caught deadly signal");
964 }
965 }
966
967 static void signal_setup_default(struct signal_task *st)
968 {
969 st->task.pre_select = signal_pre_select;
970 st->task.post_select = signal_post_select;
971 sprintf(st->task.status, "signal task");
972 }
973
974 static void command_pre_select(struct sched *s, struct task *t)
975 {
976 struct command_task *ct = container_of(t, struct command_task, task);
977 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
978 }
979
980 static void command_post_select(struct sched *s, struct task *t)
981 {
982 int ret;
983 struct command_task *ct = container_of(t, struct command_task, task);
984 static struct timeval last_status_dump;
985 struct timeval tmp, delay = {0, 500 * 1000};
986
987 tv_add(&last_status_dump, &delay, &tmp);
988 if (tv_diff(&tmp, now, NULL) < 0) {
989 audiod_status_dump();
990 last_status_dump = *now;
991 }
992
993 if (!FD_ISSET(ct->fd, &s->rfds))
994 return;
995 ret = handle_connect(ct->fd);
996 if (ret < 0)
997 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
998 }
999
1000 static void init_command_task(struct command_task *ct)
1001 {
1002 ct->task.pre_select = command_pre_select;
1003 ct->task.post_select = command_post_select;
1004 ct->task.error = 0;
1005 ct->fd = audiod_get_socket(); /* doesn't return on errors */
1006 sprintf(ct->task.status, "command task");
1007 }
1008
1009 static void close_stat_pipe(void)
1010 {
1011 if (!stat_task->ct)
1012 return;
1013 client_close(stat_task->ct);
1014 stat_task->ct = NULL;
1015 clear_and_dump_items();
1016 stat_task->length_seconds = 0;
1017 stat_task->offset_seconds = 0;
1018 stat_task->vss_status = 0;
1019 stat_task->current_audio_format_num = -1;
1020 audiod_status_dump();
1021 }
1022
1023 /**
1024 * close the connection to para_server and exit
1025 *
1026 * \param status the exit status which is passed to exit(3)
1027 * \param msg the log message
1028 *
1029 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1030 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1031 * EXIT_FAILURE.
1032 *
1033 * \sa exit(3)
1034 */
1035 void __noreturn clean_exit(int status, const char *msg)
1036 {
1037 PARA_EMERG_LOG("%s\n", msg);
1038 if (socket_name)
1039 unlink(socket_name);
1040 close_stat_pipe();
1041 exit(status);
1042 }
1043
1044 /* avoid busy loop if server is down */
1045 static void set_stat_task_restart_barrier(unsigned seconds)
1046 {
1047 struct timeval delay = {seconds, 0};
1048 tv_add(now, &delay, &stat_task->restart_barrier);
1049 }
1050
1051 static bool try_to_close_slot(int slot_num)
1052 {
1053 struct slot_info *s = &slot[slot_num];
1054 struct audio_format_info *a = afi + s->format;
1055 int i;
1056
1057 if (s->format < 0)
1058 return false;
1059 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1060 return false;
1061 for (i = 0; i < a->num_filters; i++)
1062 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1063 return false;
1064 for (i = 0; i < a->num_writers; i++)
1065 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1066 return false;
1067 PARA_INFO_LOG("closing slot %d\n", slot_num);
1068 close_writers(s);
1069 _close_filters(s);
1070 close_receiver(slot_num);
1071 clear_slot(slot_num);
1072 return true;
1073 }
1074
1075 /*
1076 * Check if any receivers/filters/writers need to be started and do so if
1077 * necessary.
1078 */
1079 static void start_stop_decoders(struct sched *s)
1080 {
1081 int i, ret;
1082 struct slot_info *sl;
1083 struct audio_format_info *a;
1084
1085 FOR_EACH_SLOT(i)
1086 if (try_to_close_slot(i))
1087 sched_min_delay(s);
1088 // if (audiod_status != AUDIOD_ON ||
1089 // !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1090 // return kill_all_decoders(-E_NOT_PLAYING);
1091 ret = open_current_receiver(s);
1092 if (ret < 0)
1093 return;
1094 sl = slot + ret;
1095 a = afi + sl->format;
1096 if (a->num_filters)
1097 open_filters(sl);
1098 open_writers(sl);
1099 activate_grab_clients();
1100 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1101 sched_min_delay(s);
1102 }
1103
1104 /* restart the client task if necessary */
1105 static void status_pre_select(struct sched *s, struct task *t)
1106 {
1107 struct status_task *st = container_of(t, struct status_task, task);
1108
1109 if (audiod_status == AUDIOD_OFF) {
1110 if (!st->ct)
1111 goto out;
1112 if (st->ct->task.error >= 0) {
1113 st->ct->task.error = -E_AUDIOD_OFF;
1114 goto out;
1115 }
1116 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1117 goto out;
1118 close_stat_pipe();
1119 st->clock_diff_count = conf.clock_diff_count_arg;
1120 goto out;
1121 }
1122 if (st->ct) {
1123 int ret;
1124 if (st->ct->task.error < 0) {
1125 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1126 goto out;
1127 close_stat_pipe();
1128 goto out;
1129 }
1130 if (st->ct->status != CL_RECEIVING)
1131 goto out;
1132 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1133 update_item);
1134 if (ret < 0) {
1135 st->ct->task.error = ret;
1136 goto out;
1137 }
1138 if (st->ct->loaded != ret) {
1139 st->last_status_read = *now;
1140 st->ct->loaded = ret;
1141 } else {
1142 struct timeval diff;
1143 tv_diff(now, &st->last_status_read, &diff);
1144 if (diff.tv_sec > 61)
1145 st->ct->task.error = -E_STATUS_TIMEOUT;
1146 }
1147 goto out;
1148 }
1149 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1150 goto out;
1151 if (st->clock_diff_count) { /* get status only one time */
1152 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1153 int argc = 5;
1154 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1155 st->clock_diff_count--;
1156 client_open(argc, argv, &st->ct, NULL);
1157 set_stat_task_restart_barrier(2);
1158 sched_min_delay(s);
1159
1160 } else {
1161 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1162 int argc = 4;
1163 client_open(argc, argv, &st->ct, NULL);
1164 set_stat_task_restart_barrier(5);
1165 sched_min_delay(s);
1166 }
1167 free(stat_item_values[SI_BASENAME]);
1168 stat_item_values[SI_BASENAME] = para_strdup(
1169 "no connection to para_server");
1170 stat_client_write_item(SI_BASENAME);
1171 st->last_status_read = *now;
1172 out:
1173 start_stop_decoders(s);
1174 }
1175
1176 static void init_status_task(struct status_task *st)
1177 {
1178 memset(st, 0, sizeof(struct status_task));
1179 st->task.pre_select = status_pre_select;
1180 st->sa_time_diff_sign = 1;
1181 st->clock_diff_count = conf.clock_diff_count_arg;
1182 st->current_audio_format_num = -1;
1183 sprintf(st->task.status, "status task");
1184 }
1185
1186 static void set_initial_status(void)
1187 {
1188 audiod_status = AUDIOD_ON;
1189 if (!conf.mode_given)
1190 return;
1191 if (!strcmp(conf.mode_arg, "sb")) {
1192 audiod_status = AUDIOD_STANDBY;
1193 return;
1194 }
1195 if (!strcmp(conf.mode_arg, "off")) {
1196 audiod_status = AUDIOD_OFF;
1197 return;
1198 }
1199 if (strcmp(conf.mode_arg, "on"))
1200 PARA_WARNING_LOG("invalid mode\n");
1201 }
1202
1203 __noreturn static void print_help_and_die(void)
1204 {
1205 int d = conf.detailed_help_given;
1206 const char **p = d? audiod_args_info_detailed_help
1207 : audiod_args_info_help;
1208
1209 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1210 AUDIOD_CMDLINE_PARSER_VERSION);
1211 printf_or_die("%s\n\n", audiod_args_info_usage);
1212 for (; *p; p++)
1213 printf_or_die("%s\n", *p);
1214 print_receiver_helps(d);
1215 print_filter_helps(d);
1216 print_writer_helps(d);
1217 exit(0);
1218 }
1219
1220 static void init_colors_or_die(void)
1221 {
1222 int ret, i;
1223
1224 if (!want_colors())
1225 return;
1226 daemon_set_default_log_colors();
1227 daemon_set_flag(DF_COLOR_LOG);
1228 for (i = 0; i < conf.log_color_given; i++) {
1229 ret = daemon_set_log_color(conf.log_color_arg[i]);
1230 if (ret < 0)
1231 exit(EXIT_FAILURE);
1232 }
1233 }
1234
1235 /**
1236 * the main function of para_audiod
1237 *
1238 * \param argc usual argument count
1239 * \param argv usual argument vector
1240 *
1241 * \return EXIT_SUCCESS or EXIT_FAILURE
1242 *
1243 * \sa para_audiod(1)
1244 * */
1245 int main(int argc, char *argv[])
1246 {
1247 int ret, i;
1248 static struct sched s;
1249 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1250 struct audiod_cmdline_parser_params params = {
1251 .override = 0,
1252 .initialize = 1,
1253 .check_required = 0,
1254 .check_ambiguity = 0,
1255 .print_errors = 1
1256 };
1257
1258 valid_fd_012();
1259 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1260 exit(EXIT_FAILURE);
1261 HANDLE_VERSION_FLAG("audiod", conf);
1262 /* init receivers/filters/writers early to make help work */
1263 recv_init();
1264 filter_init();
1265 writer_init();
1266 if (conf.help_given || conf.detailed_help_given)
1267 print_help_and_die();
1268 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1269 parse_config_or_die();
1270 init_colors_or_die();
1271 init_random_seed_or_die();
1272 daemon_set_flag(DF_LOG_TIME);
1273 daemon_set_flag(DF_LOG_HOSTNAME);
1274 daemon_set_flag(DF_LOG_LL);
1275 if (conf.log_timing_given)
1276 daemon_set_flag(DF_LOG_TIMING);
1277 if (conf.logfile_given) {
1278 daemon_set_logfile(conf.logfile_arg);
1279 daemon_open_log_or_die();
1280 }
1281 ret = parse_stream_args();
1282 if (ret < 0) {
1283 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1284 exit(EXIT_FAILURE);
1285 }
1286 log_welcome("para_audiod");
1287 server_uptime(UPTIME_SET);
1288 set_initial_status();
1289 FOR_EACH_SLOT(i)
1290 clear_slot(i);
1291 setup_signal_handling();
1292 signal_setup_default(sig_task);
1293
1294 init_status_task(stat_task);
1295 init_command_task(cmd_task);
1296
1297 if (conf.daemon_given)
1298 daemonize();
1299
1300 register_task(&sig_task->task);
1301 register_task(&cmd_task->task);
1302 register_task(&stat_task->task);
1303 s.default_timeout.tv_sec = 2;
1304 s.default_timeout.tv_usec = 999 * 1000;
1305 ret = schedule(&s);
1306
1307 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1308 return EXIT_FAILURE;
1309 }